KR102677364B1 - Die casting machine injection device, die casting machine, structure and casting method of die casting machine vacuum piping - Google Patents

Abstract

By preventing the inflow of external air into the suctioned sleeve, fluctuation of the molten metal is suppressed and stable suction within the sleeve is realized.
The injection device 1 of the die casting machine 100 is capable of sucking the suction recess 120 defined in the tip 20 of the plunger 12 and the space 75 ahead of the front end of the tip 20. Consists of. In the sleeve 11, two or more suction ports 14 to 17 capable of sucking the inside of the sleeve 11 are formed side by side in the forward and backward direction D1 of the plunger 12. Depending on the position of the plunger 12 advancing with respect to the sleeve 11, at least one of the two or more suction ports 14 to 17 selectively communicates with the front space 75, and two or more suction ports 14 to 17 ), at least one optionally communicates with the inside of the suction recess 120.

Description

Die casting machine injection device, die casting machine, structure and casting method of die casting machine vacuum piping

The present invention relates to an injection device that injects molten metal toward the cavity of a die casting machine using a plunger that can advance and retreat from the inside of a sleeve, a die casting machine equipped with the injection device, a structure of a vacuum piping of the die casting machine, and an injection device using the die casting machine. It's about the casting method.

In order to suppress the occurrence of blowholes in die-casting products by efficiently increasing the degree of vacuum inside the sleeve to which molten metal is supplied or in the cavity where molten metal is injected by a plunger from within the sleeve, a technique is known to suction the inside of the sleeve.

For example, Patent Document 1 describes a die casting machine that suctions the inside of a sleeve using a vacuum pump.

This die casting machine is equipped with first to fourth suction devices for suctioning the inside of the sleeve and the cavity of the mold. A first suction device and a second suction device are used to suction the inside of the sleeve. The first suction device sucks the inside of the sleeve through a hole located near the pouring port into which molten metal such as aluminum alloy is injected and forward of the pouring port. The second suction device sucks the closed space formed between the constriction between the tip of the plunger and the flange of the plunger rod and the inner peripheral surface of the sleeve, thereby sucking the inside of the sleeve through the gap between the constriction of the tip and the inner peripheral surface of the sleeve. Suction. Suction of the closed space formed by the constriction is effected through a through hole formed along the axial direction in the flange of the plunger rod.

In Patent Document 1, after injecting molten metal into the sleeve, when the plunger advances to a position where the pouring port is closed by the tip of the plunger, first, through the hole near the pouring port, the first suction device moves the inside of the sleeve. It sucks in gas from the space ahead of the tip. At this time, the gas in the cavity is also sucked through the front space within the sleeve.

Next, when the plunger advances to the position where the hole near the pouring port is closed by the tip, the process switches to suction by the second suction device. The second suction device suctions the closed space defined between the constriction of the plunger and the inner peripheral surface of the sleeve through the axial through hole of the flange of the plunger rod, thereby suctioning the space ahead of the tip in the sleeve.

After suction is started by the second suction device, suction within the cavity is started by the third suction device.

According to the description in Patent Document 1, since the inside of the cavity is sucked through the sleeve by the first suction device, the degree of vacuum in the cavity is prevented from becoming higher than the degree of vacuum in the sleeve, thereby suppressing the generation of hot metal.

Japanese Patent Publication No. 2014-117741

If the molten metal in the sleeve is agitated due to the inflow of external air into the sleeve, which becomes a negative pressure with respect to atmospheric pressure due to suction, the suction hole may be blocked by the adhesion of molten metal scattering, or the suction efficiency may be reduced due to the accumulation of molten metal residue in the vacuum line. There are cases where it leads to a decline in .

“The molten metal is shaken” means, for example, that external air is blown in from the rear end of the sleeve forward through the radial gap between the plunger and the sleeve, causing the molten metal to bubble and scatter, or the surface of the molten metal to violently shake. says that It is desired to stably suction the gas in the sleeve without the suction path being blocked or the suction efficiency being reduced due to the fluctuation of the molten metal.

Even with the die casting machine described in Patent Document 1, there is a risk that the suction hole or pipe may be blocked due to the molten metal being shaken during suction within the sleeve.

Accordingly, the present invention aims to realize stable suction within the sleeve by preventing the inflow of external air into the suctioned sleeve and suppressing fluctuation of the molten metal.

The present invention relates to an injection device comprising a sleeve through which molten metal is supplied to the inside, a plunger capable of advancing and retracting from the inside of the sleeve, and injecting molten metal by the plunger toward the cavity of a die casting machine, wherein the tip of the plunger is attached to the inner periphery of the sleeve. In contrast, a suction concave portion retreats inward in the radial direction and is continuous in the circumferential direction, and is configured to enable suction of the space ahead of the front end of the tip and the inside of the suction concave portion, and the sleeve has sleeves on the inside and outside. Two or more suction ports that penetrate through and are capable of sucking the inside of the sleeve are formed side by side in the forward and backward direction of the plunger, and depending on the position of the plunger advancing with respect to the sleeve, at least one of the two or more suction ports is selectively connected to the space in front. It communicates, and is characterized in that at least one of the two or more suction ports selectively communicates with the inside of the suction recess.

“Inside the suction recess” shall mean the space defined between the tip and the sleeve.

“Configuration capable of suction” means that the injection device is provided with a suction hole or path formed in the sleeve or plunger tip, and the injection device is provided with a vacuum suction system that suctions through the suction hole or path. , This means that the inside of the sleeve is configured to be suctionable. The vacuum suction system includes, for example, piping, valves, a vacuum pump, and a vacuum tank.

In the injection device of the die casting machine of the present invention, two or more suction ports are arranged at predetermined intervals in the advancing and retreating direction, the tip is located at the front of the advancing and retreating direction, the first large diameter portion is located at the rear of the advancing and retreating direction, and the first large diameter portion is located at the rear of the advancing and retreating direction. It is provided with a second large diameter part that divides the suction concave portion between the neck portion, the number of suction ports is n, the dimension of the suction port in the advance and retreat direction is Ls2, the spacing between suction ports adjacent in the advance and retreat direction is Ls3, and the advance and retreat direction of the suction concave portion is Ls2. When the dimension of

Additionally, it is desirable to satisfy the requirements expressed in one of the following formulas.

Ls1 is assumed to be the distance in the advance and retreat direction from the pouring port of the sleeve to the suction port closest to the pouring port.

Lp0＜Ls1+n×Ls2+(n-1)×Ls3-Lp1

Lp2≥Ls2

Lp0＞Ls3

The injection device of the die casting machine of the present invention is provided with a sliding seal that continues in the circumferential direction along the outer periphery of the tip of the plunger and slides on the inner periphery of the sleeve as the plunger advances and retreats, and the sliding seal is provided at the tip. It is preferable that it is located in a location other than the suction recess in .

Additionally, it is desirable to provide a seal member that is disposed inside the radial direction of the sliding seal and seals the gap between the sliding seal and the tip.

In the above configuration, it is preferable that the sliding seal is constructed using a metal material, and the seal member is constructed using a rubber-based material.

In addition, the injection device of the die casting machine of the present invention is preferably provided with two or more sliding seals parallel to the advance and retreat direction of the plunger, and a seal member is disposed between at least one sliding seal and the tip.

In the injection device of the die casting machine of the present invention, the sliding seal is formed in an annular shape including a discontinuous portion that is a discontinuous portion in a part of the circumferential direction, and presses the inner periphery of the sleeve toward the outer side in the radial direction. It is preferably mounted on the tip and sleeve in a closed state, and the seal member is formed in an annular shape, and is bent between the sliding seal and the tip to seal the gap.

In the injection device of the die casting machine of the present invention, the discontinuity of the sliding seal is a first gap and a second gap that are shifted from each other in the circumferential direction and the advance and retreat direction of the plunger, and a part that connects the first gap and the second gap. It is preferable that the divided portion is sealed from the radial inside by a seal member.

The injection device of the die casting machine of the present invention is provided with two or more sliding seals neighboring in the advancing and retreating direction of the plunger, and each discontinuity of the sliding seals neighboring in the advancing and retreating direction of the plunger is shifted from each other in the circumferential direction, and the neighboring The boundary of the sliding seal is preferably sealed from the radial inside by a seal member.

The injection device of the die casting machine of the present invention is provided with two or more sliding seals arranged in the advancing and retreating direction of the plunger, and each discontinuity of the sliding seals adjacent to the advancing and retreating direction of the plunger is spaced apart from each other in the circumferential direction. desirable.

The injection device of the die casting machine of the present invention has a tip, which defines a suction concave portion between the outer peripheral portion of the first large diameter portion located on the front side in the advancing and retreating direction and the first large diameter portion located on the rear side in the advancing and retreating direction. It is preferable that a sealant supply device capable of supplying a sealant to the outer periphery of the second large-diameter portion is provided, and that the gap between the inner periphery of the sleeve and the outer periphery of each of the first large-diameter portion and the second large-diameter portion is sealed with the sealant. .

In the injection device of the die casting machine of the present invention, a collection structure is provided on the suction path through which gas is sucked from the inside of the sleeve through the suction port to collect molten metal residue mixed into the gas, and the collection structure is A collection section connected to the suction path and receiving molten metal residue, a first section of the suction path extending from the upstream side of the suction path toward the collection section, surrounding the first section from the outside, and extending beyond the first section to the collection section. It is provided with a section connection section leading to the section connection section and a second section of the suction path connected to the section connection section at a position where the first section is surrounded by the section connection section, and the first section and the second section communicate through the inside of the section connection section. It is desirable.

In the injection device of the die casting machine of the present invention, the first section extends downward toward the collection section, and the height of the outlet of the first section is preferably equal to or less than the height of the inlet of the second section.

In the injection device of the die casting machine of the present invention, it is preferable that the section connecting portion has a backflow prevention portion with a small opening cross-sectional area relative to the collecting portion.

In the injection device of the die casting machine of the present invention, the collection structure is preferably provided in the collection part, and has an outlet through which molten metal residues can pass, and a valve capable of opening and closing the outlet.

In the injection device of the die casting machine of the present invention, a collecting part is provided on the suction path through which gas is sucked through the suction port from the inside of the sleeve, and collects molten metal residue mixed in the gas, and at least a part of the suction path. There is provided a cleaning section extending from the upstream side of the collection unit toward the collection unit, and the cleaning section has a curved shape from a plurality of pipes whose flanges are connected to each other by a connecting member, and the connecting member is located on the outside of the pipe. It is desirable to have an exposed grip portion and to be attachable to and detachable from the flange by the grip portion.

In the injection device of the die casting machine of the present invention, the cleaning section preferably extends from the vicinity of the suction port to the vicinity of the collection portion.

In the injection device of the die casting machine of the present invention, the connecting member is provided with a center ring disposed between flanges and a clamp that restrains the flanges in a collision state via the center ring, and the clamp is attached to the flanges. It is preferable to include two or more clamp bodies arranged around the clamp body and a gripping part capable of fastening or loosening the clamp bodies to the flange.

In addition, the present invention relates to a die casting machine having a suction path for vacuum suction within a space formed by communicating from the inner space of the sleeve to the cavity of the mold, wherein gas is sucked from the cavity through a cavity suction port formed in the mold. On the path, a collection structure is provided to collect molten metal waste mixed into the gas, and the collection structure is connected to the suction path and includes a collection part that receives the molten metal waste, and a suction path extending from the upstream side of the suction path toward the collection part. a first section, a section connection portion surrounding the first section from the outside and reaching the collection section beyond the first section, and a second suction path connected to the section connection section at a position where the first section is surrounded by the section connection section. It has a section, and the first section and the second section are characterized in that they are connected through the inside of the section connection part.

In addition, the present invention relates to a structure of vacuum piping for a die casting machine that vacuum-suctions the space formed by communicating from the inner space of the sleeve to the cavity of the mold, in which gas is sucked from the cavity through a cavity suction port formed in the mold. It is provided on the suction path and has a collecting section that collects molten metal residue mixed in the gas, and a cleaning section extending from the upstream side of the collecting section toward the collecting section in at least a part of the suction path, and the cleaning section is for connection. It forms a curved shape from a plurality of pipes in which flanges are connected to each other by a member, and the connecting member has a grip portion exposed to the outside of the pipe and is characterized in that it is attachable to and detachable from the flange by the grip portion.

In addition, the present invention relates to a casting method using an injection device that injects molten metal toward the cavity of a die casting machine by means of a plunger capable of advancing and retracting from the inside of a sleeve into which molten metal is supplied, wherein the tip of the plunger is attached to the inner periphery of the sleeve. It retreats to the inside in the radial direction and is defined by a concave portion for suction that is continuous in the circumferential direction. The sleeve has two or more suction ports that penetrate the sleeve on the inside and outside and are capable of sucking the inside of the sleeve, arranged side by side in the advance and retreat direction of the plunger. It is formed to depressurize the space ahead of the front end of the tip by suction through at least one suction port that communicates with the space ahead of the front end of the tip, and through at least one suction port that communicates with the inside of the suction concave portion. It is characterized in that the inside of the suction recess is decompressed by suction.

In the casting method of the present invention, a sliding seal is formed on the radial inner side of the sliding seal that continues in the circumferential direction along the outer periphery of the tip of the plunger and slides the inner periphery of the sleeve as the plunger advances and retreats. It is preferable to attach a sliding seal and a seal member to the plunger and the sleeve, with the seal member sealing the gap between the tips disposed, and to suction the front space and the inside of the suction recess.

In the above configuration, it is desirable to keep the gap, which widens due to thermal expansion of the sleeve and the sliding seal, sealed by a seal member.

In the casting method of the present invention, after completing the suction in the sleeve through the suction port, it is preferable to use a pressurized tank to blow air into the inside of the sleeve through the suction port.

According to the injection device of the die casting machine of the present invention and the casting method using the same, as described later, stable suction within the sleeve can be realized by preventing the inflow of external air into the suctioned sleeve and suppressing fluctuation of the molten metal. In addition, according to the structure provided with the collecting part of the present invention, the die casting machine can be operated stably by suppressing the inflow of molten metal waste into the vacuum line. In addition, according to the vacuum piping structure that can be disassembled into a plurality of parts by hand using a gripper, it can contribute to improving the efficiency of cleaning work to remove molten metal residue.

1 is a side view of a partially broken die casting machine according to a first embodiment of the present invention.
FIG. 2 is a diagram schematically showing a system for suctioning the inside of the sleeve of an injection device provided in the die casting machine shown in FIG. 1.
Figures 3(a) to 3(d) are diagrams showing an example of the process from the molten metal into the sleeve to the molten metal being injected by the advance of the plunger and filling the cavity of the mold.
FIG. 4(a) is a partially enlarged view of the plunger and sleeve of the injection device of the die casting machine shown in FIG. 1. The plunger and sleeve are equipped with a sliding seal and seal member. Figure 4(b) is a cross-sectional view taken along line IVb-IVb of Figure 4(a).
FIG. 5(a) is a diagram schematically showing the plunger unit shown in FIG. 4(a). Figure 5(b) is an enlarged view of the discontinuity of the sliding seal shown in Figure 5(a). FIG. 5(c) is a diagram showing an example where the position of the gap in the discontinuous portion is different from FIG. 5(b). In Figures 5 (b) and (c), the seal member is omitted.
Figure 6 is a perspective view showing the sliding seal and seal member in a separated state from the plunger.
FIG. 7(a) is a cross-sectional view schematically showing the sleeve, plunger, sliding seal, and seal member at a position corresponding to line VIIa-VIIa in FIG. 4. FIG. 7(b) is an enlarged view of part VIIb shown in FIG. 7(a).
Figures 8 (a) to (d) are diagrams showing modifications according to the sliding seal and seal member, respectively.
Figure 9 is a flow chart of a casting method by die casting.
FIG. 10 is a flowchart showing the contents of processing (sleeve vacuum and air blow) by the circuit A shown in FIG. 9.
FIGS. 11(a) to 11(f) are diagrams showing a series of steps of sleeve vacuum suction using the die casting machine shown in FIG. 1.
Figures 12(a) to 12(e) are diagrams for explaining the dimensional relationship between a plurality of suction ports provided in the sleeve and each part of the plunger in the forward and backward direction.
Figure 13(a) is a partially broken side view showing the main part of the injection device of the die casting machine according to the second embodiment of the present invention. FIG. 13(b) is a cross-sectional view taken along line XIIIb-XIIIb of FIG. 13(a).
FIGS. 14(a) to 14(c) are diagrams showing a series of steps of sleeve vacuum suction using the die casting machine shown in FIG. 13.
Figure 15 is a diagram explaining an injection device equipped with a sealant supply device according to an embodiment of the present invention.
Figure 16 is a diagram schematically showing a structure for collecting molten metal waste according to a third embodiment of the present invention.
FIG. 17(a) is a diagram for explaining the action of the trapping structure shown in FIG. 16. Figure 17(b) is a diagram showing another example.
Fig. 18 is a diagram showing a collection structure according to a first modification of the third embodiment.
Fig. 19 is a vertical cross-sectional view showing a collection structure according to a second modification of the third embodiment.
Figure 20 is a diagram schematically showing a structure for collecting molten metal waste according to a fourth embodiment of the present invention.
Fig. 21 is a diagram schematically showing a part of the suction path (cleaning section) and the collection unit according to the fifth embodiment of the present invention.
FIG. 22 is a cross-sectional view taken along line ⅩⅩⅡ-ⅩⅩⅡ of FIG. 21.
FIG. 23 is a diagram showing the clamp in a closed state as seen from the arrow ⅩⅩⅢ in FIG. 22.
Figure 24 is a perspective view of the clamp in an open state.
Fig. 25 is a diagram schematically showing a part of the suction path (cleaning section) and a collection unit according to a modification of the fifth embodiment.
Fig. 26 is a diagram showing an example of piping that can be used in the cleaning section of the fifth embodiment.
Figure 27 is a diagram schematically showing the collection structure and cleaning section according to the sixth embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]

1 to 12, a die casting machine 100 according to the first embodiment will be described.

(Schematic configuration of die casting machine)

1 is a schematic side view (some including a cross-sectional view) of a die casting machine 100 equipped with an injection device 1 according to one embodiment of the present invention.

The die casting machine 100 includes a movable plate 4 on which a movable mold 22 is installed, a fixed plate 5 on which a fixed mold 21 is installed, and a machine base that supports the movable plate 4 and the fixed plate 5. (8), an injection device (1) that injects the molten metal (18) toward the cavity (23), and a control device (3) that controls the operation of each part of the die casting machine (100). .

The die casting machine 100 has a cavity 23 and the inside of the sleeve 11 of the injection device 1 in order to suppress the generation of internal holes (blowholes) caused by mixing of gas into the molten metal 18. Perform vacuum suction.

The main feature of the die casting machine 100 is that the injection device 1 is provided with a structure capable of sufficiently suppressing the inflow of external air into the sleeve 11, as will be described later, in order to stably suction the inside of the sleeve 11. do.

The movable plate 4 moves on the machine base 8 toward the fixed plate 5 by means of a mold opening/closing/mold fastening mechanism (not shown) such as a toggle link mechanism or a ball screw mechanism. As a result, the movable mold 22 and the fixed mold 21 are engaged and die clamped, thereby forming the cavity 23.

Four tie bars 7 are inserted into the insertion holes of the movable panel 4 and the fixed panel 5. The movable panel 4 moves forward and backward relative to the stationary panel 5 along the tie bar 7. When the fixed mold 21 and the movable mold 22 are engaged as shown in FIG. 1, a cavity (product portion) 23 is formed between them. A cast molded product is manufactured by injecting and filling molten metal 18, such as aluminum or aluminum alloy, into the cavity 23.

The fixing plate 5 is provided with an injection device 1. The injection device 1 is provided with a sleeve 11 into which the molten metal 18 is supplied inside, and a plunger 12 that can advance and retreat with respect to the sleeve 11 from the inside of the sleeve 11. The injection device 1 injects the molten metal 18 toward the cavity 23 using the plunger 12.

Regarding the injection device 1, the front of the moving direction of the plunger 12 when injecting the molten metal 18, that is, the side close to the cavity 23 is defined as "front", and the side farther from the cavity 23 is defined as "front". The side is defined as “after.”

The plunger 12 generally includes a plunger rod 19 and a plunger tip 20 provided on the front side of the plunger rod 19. The plunger tip 20 is also simply referred to as tip 20. Additionally, the plunger rod 19 is also simply referred to as rod 19.

To drive the plunger 12 back and forth, a hydraulic cylinder (not shown) is provided on the plunger rod 19. The plunger rod 19 is connected to the piston rod of the same hydraulic cylinder via a coupling (not shown).

When injecting the molten metal 18, the plunger 12 moves forward, and after injection, it moves backward. The direction in which the plunger 12 advances and retreats (forward and backward directions) is defined as the “advance and retreat direction.”

The sleeve 11 is a linearly extending cylindrical body. As shown in Fig. 4(a), a tapered surface 11C enlarged toward the rear is formed at the rear end 11B of the sleeve 11 into which the plunger 12 is inserted. The axial direction of the sleeve 11 coincides with the advance/retract direction D1 of the plunger 12. As will be described later, the injection device 1 is configured to be capable of suctioning the inside of the sleeve 11 by providing a vacuum suction system 2 (FIG. 2).

The sleeve 11 can store the molten metal 18 supplied from the pouring port 13 inside the sleeve 11. The front end of the sleeve 11 penetrates the fixing plate 5 and is fitted with the hole 10 provided in the fixing mold 21. The rear end side of the sleeve 11 faces the outside of the fixing plate 5 and extends horizontally toward the rear. A pouring port 13 through which the molten metal 18 is injected is provided at the rear end of the sleeve 11.

A hot water storage room is formed including the inside of the sleeve 11 and the hole 10 of the fixing mold 21. This storage room is connected to the cavity 23 via the runner 24 and the gate 25.

The control device 3 controls the driving of the hydraulic cylinder that advances and retreats the plunger 12 while detecting the position of the plunger 12 in the advancing and retreating direction D1 using a sensor or the like.

Detection of the position of the plunger 12 is performed, as an example, by detecting a mark provided on the piston rod corresponding to the stroke of the hydraulic cylinder with a non-contact sensor. As another example, a switch lever provided on the plunger rod 19, a plurality of fixed limit switches, etc. may be used.

As shown in FIG. 2, the injection device 1 is provided with a vacuum suction system 2 that suctions the inside of the sleeve 11. The vacuum suction system 2 depressurizes the inside of the sleeve 11 by suction using the vacuum pump 37 and the vacuum tank 36. The specific configuration of the vacuum suction system 2 will be described later.

The sleeve 11 of this embodiment is provided with a plurality of suction ports penetrating through the inside and outside of the sleeve 11 in order to enable the vacuum suction system 2 to suction the gas inside the sleeve 11. Numbers 14 to 17 (here, 4) are arranged side by side in the axial direction D1 of the sleeve 11. These suction ports 14 to 17 are formed in the upper part of the sleeve 11 so as to be located above the molten metal surface 18A (FIG. 4(a)) of the molten metal 18 supplied to the inside of the sleeve 11. there is.

Providing each suction hole 14 to 17 penetrating the wall around the sleeve 11 in the thickness direction is compared to the case of drilling the plunger tip 20 in the axial direction for vacuum suction within the sleeve 11. Therefore, the limitation on the opening area is small. For this reason, the suction ports 14 to 17 can secure a large opening area. In addition, the latter has a hole formed in the axial direction of the plunger tip 20, and an axial hole of the rod 19 connected to this hole or a thin and long path consisting of a pipe along the rod 19 is formed in the sleeve 11. In other words, according to the former suction ports 14 to 17, a path having a length corresponding to the thickness of the sleeve 11 is formed on the peripheral wall of the sleeve 11. For this reason, even if the path is blocked by molten metal residue, it is advantageous from the viewpoint of the effort required for cleaning work.

In this embodiment, as will be described later, when the plunger 12 advances with respect to the sleeve 11, from a position distributed in the advance and retreat direction D1, it is forward (on the cavity 23 side) of the front end 20A. Suction is continuously performed from the inside of the space 75 and the suction recess 120 further behind it.

In addition, it is assumed that both the front space 75 and the inside of the suction recess 120 are vacuum-suctioned in a state in which the forward movement of the plunger 12 is temporarily stopped.

In order to improve the efficiency of suction by securing a large area of the suction opening facing the inside of the sleeve 11, and also from the viewpoint of redundancy in ensuring ventilation against blockage of the suction opening or path, the sleeve ( It is preferable that a plurality of suction ports 14 to 17 are used for vacuum suction within 11).

Here, if the only purpose is to suction from the front space 75, it is sufficient to have one suction port on the front end side of the sleeve 11. However, in this embodiment, as will be described later, while suctioning is performed from the anterior space 75, external air is also suctioned from the suction recess 120 (FIG. 4(a)), thereby causing the inflow of external air into the anterior space 75. In order to achieve suppression, the sleeve 11 is provided with a plurality of suction ports 14 to 17 distributed in the forward/backward direction D1.

In that way, while ensuring a sufficient area of the opening used for suction, when the plunger 12 is advanced, the suction recess 120 is sequentially communicated with the plurality of suction ports 14 to 17 to achieve suction with the front space 75. Since suction can be continuously drawn from both sides of the molten metal concave portion 120, fluctuation of the molten metal 18 due to the inflow of external air into the front space 75 can be suppressed.

According to the plurality of suction ports 14 to 17 distributed in the forward/backward direction D1, as will be described later, after starting the vacuum suction within the sleeve 11, until the vacuum suction within the sleeve 11 is terminated. The front space 75 can be suctioned through at least one suction port at all times, and the inside of the suction recess 120 can be suctioned through at least one suction port.

However, it is also acceptable for the sleeve 11 to have only one suction port or for only one suction port to be used among a plurality of suction ports. The number of suction ports can be set to an appropriate number by considering the length of the sleeve 11, the size of the suction port, the length of the plunger tip 20, etc.

A long suction port may be formed in the sleeve 11 in the axial or circumferential direction, and a vacuum suction line may be connected to the suction port. However, typically, a suction pipe with a circular cross section is connected to the circular suction port.

The path used to suction the inside of the sleeve 11 is not limited to holes penetrating the peripheral wall of the sleeve 11, such as the suction ports 14 to 17, and includes the outer peripheral portion of the plunger 12 and the sleeve 11. ), or may be a hole formed in the axial direction inside the plunger tip 20.

Each suction port 14 to 17 penetrates the peripheral wall of the sleeve 11 in the thickness direction. These suction ports 14 to 17 are arranged side by side at intervals in the forward and backward direction D1 of the plunger 12, and from the rear side of the sleeve 11 toward the front side, the suction ports 14, 15, 16, 17 It is arranged in the order of. Hereinafter, these suction ports 14 to 17 may be referred to as the first suction port 14, the second suction port 15, the third suction port 16, and the fourth suction port 17. .

The first suction port 14 is located at the rearmost, and the fourth suction port 17 is located at the frontmost.

The vacuum suction system 2 depressurizes the inside of the sleeve 11 to a predetermined degree of vacuum by extracting the gas inside the sleeve 11 through the suction ports 14 to 17. When the pressure inside the sleeve 11 is reduced by the vacuum suction system 2, the cavity 23 is also suctioned through the inside of the sleeve 11, so the vacuum suction system 2 is used to depressurize the inside of the sleeve 11 and the cavity 23. ) can be decompressed.

The die casting machine 100 is typically equipped with another vacuum suction system (not shown) that directly depressurizes the cavity 23 through a suction path provided in the mold.

This vacuum suction system, for example, connects the cavity (28) to the chill-vent (27) provided at the boundary between the fixed mold (21) and the movable mold (22). 23) Directly absorbs gases such as air. In addition to air, the sucked gas may include molten metal or vapor of a mold release agent.

The chill vent 27 formed of a metal material with high thermal conductivity promotes the filling of the molten metal 18 into the cavity 23 by exhausting the cavity 23 through the connector 28, that is, performing gas removal. At the same time, by cooling the molten metal 18, the molten metal 18 is prevented from flowing out of the connector 28 due to exhaust. The chill vent 27 is divided into a block installed in the fixed mold 21 and a block installed in the movable mold 22.

Instead of the chill vent 27, a vacuum valve (not shown) may be installed at the boundary between the fixed mold 21 and the movable mold 22. In that case, gas can be sucked directly from the cavity 23 through the vacuum valve.

The control device 3 (FIG. 1) includes a vacuum suction system 2, and opens and closes various valves provided in the vacuum suction system of the die casting machine 100 at appropriate timings to control the vacuum suction system 2. The suction state within the sleeve 11 and the cavity 23 can be controlled.

If a plurality of suction ports 14 to 17 are formed in the sleeve 11, the entire suction ports 14 to 17 and the entire suction opening provided in the vacuum suction system (not shown) provided in the mold An opening area larger than the area can be given to the vacuum suction system 2. Therefore, the effect of preventing preceding molten metal due to vacuum suction can be expected.

In addition, the start of suction by the vacuum suction system 2 using the suction ports 14 to 17 of the sleeve 11 precedes the start of suction by the vacuum suction system (not shown) provided in the mold. Seontang can be prevented.

Prevention of hot melt can contribute to reduction of defects such as chipping, peeling, and stripping for shot blast.

(Explanation of basic operations of hot water heating and injection)

Figures 3 (a) to (d) are diagrams illustrating an example from the hot water supply process to the injection filling process. In FIGS. 3A to 3D , the vacuum suction system 2 connected to the suction ports 14 to 17 is omitted.

As shown in (a) of FIG. 3, the molten metal 18 is injected into the pouring port 13 of the sleeve 11 using the ladle 43 of a hot water heater (not shown), thereby forming the sleeve 11. ) supply the molten metal 18 into the molten metal (hot water supply process).

Thereafter, as the plunger 12 advances, it becomes possible to suction the space defined inside the sleeve 11 ahead of the tip 20 of the plunger 12 by the vacuum suction system 2.

Next, as shown in FIG. 3(b), the molten metal 18 in the sleeve 11 is extruded to the outside of the sleeve 11 by the tip 20 of the advancing plunger 12, thereby extruding the molten metal 18 to the outside of the sleeve 11. 18) is injected, and as shown in (c) of FIG. 3, the cavity 23 is filled with the molten metal 18 through the runner 24 and the gate 25 (injection filling process).

The speed at which the plunger 12 advances is variably controlled by giving a control command to the hydraulic cylinder that drives the plunger 12. The forward speed of the plunger 12 is suppressed low until a predetermined point in time after the plunger 12 starts moving forward, and increases thereafter.

Specifically, in the process from when the plunger 12 starts to advance from the standby position near the rear end of the sleeve 11 until it moves to the operating position near the front end of the sleeve 11, The period from when the plunger 12 starts to advance until the extruded molten metal 18 reaches the gate 25 via the runner 24 corresponds to the low-speed region. After that, the period until the cavity 23 is filled with the molten metal 18 corresponds to the high-speed region.

Control of the forward speed of the plunger 12 is not limited to the above. For example, the forward speed may be increased step by step, such as low speed, medium speed, and high speed.

Control of the forward motion of the plunger 12 is performed at the timing (speed/pressure switching point/VP (Velocity Pressure) switching point) when the cavity 23 is filled with the molten metal 18, from the above speed control to the cavity 23. This switches to pressure control (holding pressure control/increasing pressure control) based on the pressure of the molten metal 18.

Thereafter, in a state where holding pressure (pressure increasing force) is applied by the plunger 12, if the molten metal 18 in the cavity 23 is cooled and sufficiently solidified, the movable plate 4 moves to form the mold 21. , 22) is opened. When the molds 21 and 22 are opened, the product is extruded by driving the plurality of extrusion pins 42 mounted on the extrusion plate 41 (FIG. 1), so that the product can be taken out from the molds 21 and 22. You can.

(Vacuum suction system)

With reference to FIG. 2, an example of the vacuum suction system 2 capable of suctioning the inside of the sleeve 11 will be described. The vacuum suction system 2 has a suction path ( 51) is provided.

Each suction path 51 includes a vacuum filter 31 for vacuum suction, a pressure gauge, and a flexible gauge for detecting the pressure within the suction path 51, from upstream to downstream of the flow of gas sucked from within the sleeve 11. , a pressure detection unit 32 such as a pressure sensor, and a selection valve 33 for selectively communicating the suction ports 14 to 17 with the vacuum tank 36 are provided in this order.

By opening and closing the selection valve 33, each of the suction ports 14 to 17 can be brought into communication with the vacuum tank 36 at the right time. Additionally, depending on the filling rate of molten metal in the sleeve 11, etc., all or only a portion of the suction ports may be communicated with the vacuum tank 36.

The vacuum filter 31 prevents foreign substances such as fine droplets of molten metal, solidified pieces, or dust that may be mixed into the sucked gas from entering the suction path 51. While regulating the passage of molten metal droplets and solidified pieces, such as molten metal residue, taking into account that the exhaust resistance during vacuum suction is small and that it does not burn even when in contact with high-temperature molten metal residue, etc., various known methods are used. The vacuum filter 31 can be appropriately selected. For example, punched metal, mesh-shaped or brush-shaped metal members, etc. can be employed as the vacuum filter 31.

A collector that collects molten metal residues may be employed in the suction path 51.

The inside of the vacuum tank 36 is depressurized by vacuum suction performed by operating the vacuum pump 37. By using the vacuum tank 36, the gas in the sleeve 11 can be sucked intermittently into the vacuum tank 36 at the right time due to the pressure difference with the vacuum tank 36 while continuously operating the vacuum pump 37. there is.

The suction ports 14 to 17 are preferably in selective communication with the vacuum tank 36 depending on the position of the plunger 12 in the forward and backward direction D1, the state of suction from the suction ports 14 to 17, etc. do. Based on the pressure in the suction path 51 detected by the pressure detection unit 32, etc., the predetermined selection valve 33 can be opened and closed. If the pressure detection unit 32 is a pressure sensor capable of outputting a pressure detection signal, and the selection valve 33 is a solenoid valve, the control device 3 selects the pressure based on the pressure detection signal from the pressure detection unit 32. By sending a control command to the valve 33, the opening and closing of the selection valve 33 can be controlled.

When vacuum suction is performed by the vacuum suction system 2, the inside of the vacuum tank 36 and the sleeve ( Based on the pressure difference within 11), the gas inside the sleeve 11 flows into the suction path 51. The gas flowing into the suction path 51 passes through the vacuum filter 31, the pressure detection part 32, and the selection valve 33, and joins the flow from the other suction path 51 in the confluence/distribution part 34. , also flows into the vacuum tank 36 through the vacuum/air blow switching valve 35 and the pipe 55.

During vacuum suction, it is desirable to monitor the pressure (vacuum degree) of the suction path 51 detected by the pressure detection unit 32 to confirm that vacuum suction is being performed normally. If the detected pressure deviates from the normal range, the abnormality can be notified by sound or light. For example, if some of the suction ports and suction paths 51 are blocked due to molten metal residue, or even if they are not blocked, if the opening is narrowed due to the accumulation of molten metal residue or the vacuum filter 31 is blocked, the pressure detection unit ( The pressure detected by 32) deviates from the normal range to the high side. In this case, the suction port or suction path 51 where the abnormality occurred, cleaning or replacing the vacuum filter 31, etc. may be performed.

From the viewpoint of preventing a decrease in suction efficiency, based on the detected pressure, it is recommended to close the selection valve 33 corresponding to the suction port or suction path 51 that is likely to become clogged or may be easily clogged due to prior testing, etc. Accordingly, use of the suction tool or suction path 51 may be stopped, or use of the suction tool or suction path 51 may be restricted, such as limited to intermittent use, without completely stopping use. In that case, vacuum suction inside the sleeve 11 can be efficiently performed by using only the remaining suction port and suction path 51. Accordingly, the progress of clogging can be suppressed to prevent a decrease in suction efficiency, and the degree of vacuum within the sleeve 11 can be increased by continuous suction.

In addition, the selection valve 33 is not only closed when the detection pressure deviates or when it is desired to suppress clogging as described above, but also depending on the position of the plunger 12 in the advance/retract direction D1, etc., as described later. It can be controlled to open and close.

Additionally, by selecting the use/disuse of each suction port 14 to 17 to suit the mold or product using the selection valve 33, the same sleeve 11 can respond to various manufacturing conditions. It is economical because there is no need to prepare the sleeve 11 for each manufacturing condition.

(air blow)

In this embodiment, the suction ports 14 to 17 and each suction path 51 of the suction ports 14 to 17 are paths for performing air blowing that blows pressurized air into the inside of the sleeve 11. It is also used as. By air blowing, molten metal residue can be removed from the suction path 51 or the suction port.

The pressurized air supply system 9 (FIG. 2), which performs air blowing, stores pressure internally by a compressed air source 39, which is a supply source of pressurized air, and air being blown in by the compressed air source 39. It is provided with a pressurized tank 38 that does.

The vacuum suction system 2 and the pressurized air supply system 9 of the present embodiment include a vacuum/air blow switching valve 35 installed downstream (downstream during vacuum suction) of the confluence/distribution section 34. It is composed of: The vacuum/air blow switching valve 35 switches the connection destination of the confluence/distribution section 34 to the vacuum suction piping 55 and the air blow piping 56, thereby performing vacuum suction and air blowing. change the implementation of

The suction path 51 upstream of the confluence/distribution section 34 (upstream during vacuum suction) is common during vacuum suction and air blowing. Therefore, air blowing and vacuum suction can be performed continuously without production of cast products being interrupted due to replacement of the suction ports 14 to 17.

The pressure detection unit 32 is preferably capable of detecting the pressure during air blowing in addition to the pressure during vacuum suction. The pressure detected during vacuum suction is lower than atmospheric pressure. The pressure detected during air blowing is higher than atmospheric pressure.

When the vacuum/air blow switching valve 35 is switched to air blow, air is discharged from the pressurized tank 38 to each suction path 51 through the pipe 56 and the confluence/distribution section 34, and each suction It erupts from the population 14 to 17 into the sleeve 11. At the time of air blowing, the air flowing into the confluence/distribution section 34 is distributed to each suction path 51. When some of the selection valves 33 are closed, the air flow rate in the suction port and suction path 51 corresponding to the open selection valves 33 increases, thereby increasing the cleaning effect.

Therefore, after performing air blowing only on the suction ports that are likely to be clogged among the suction ports 14 to 17, or performing air blowing on the entire number of suction ports 14 to 17, additionally, based on the detected pressure, Air blowing can also be performed focusing on only some of the suction ports.

Even during air blowing, it is desirable to monitor the pressure in the suction path 51 using the pressure detection unit 32. In this way, processing such as continuing air blowing if the detected pressure is outside the normal range during air blowing and ending air blowing if it is within the normal range is possible. Additionally, if the detected pressure is excessive relative to the threshold value at the time of air blowing, it can be notified by sound or light.

Air blowing through the suction ports 14 to 17 causes the molten metal 18 to be stored in the sleeve 11, avoiding the immediate vicinity of hot water supply, so that the molten metal 18 is not shaken by the air blow or the molten metal 18 is not disrupted. It can be run without being present.

For example, as shown in Figure 3(d), at the timing (speed/pressure switching point/VP (Velocity Pressure) switching point) at which the cavity 23 is filled with the molten metal 18, the suction ports 14 to 17 For any one of these, it is preferable to perform air blowing. At this time, even if the molten metal residue falls into the sleeve 11 from each suction port 14 to 17 due to the air flow, the plunger 12 retreats thereafter, as shown in Figure 3(a). This is because, when returning to the original position, the molten metal residue can be reliably scraped out of the sleeve 11 mechanically by the rear end 20B of the plunger tip 20. That is, in a state where there is no molten metal residue in the sleeve 11, the next injection cycle can be started.

In addition to blowing air through the suction ports 14 to 17 as described above, for the purpose of cleaning the outer peripheral part of the plunger tip 20, especially the suction recess 120 described later, for example When the plunger 12 returns to the original position, air is blown into the small diameter portion 203 (FIG. 15) of the tip 20 through a pipe (not shown) provided near the rear end of the sleeve 11. It's also good. By doing so, the lubricant and molten metal residue used to lubricate the tip are removed from the outer periphery of the tip 20, so the amount of foreign matter such as tip lubricant and molten metal residue sucked by the vacuum suction system 2 can be suppressed. , can contribute to suppressing occlusion of the suction path (51), etc.

(Problem solved by preventing external air inflow)

The inside of the sleeve 11 sucked by the vacuum suction system 2 (FIG. 2) becomes a negative pressure with respect to atmospheric pressure. Therefore, based on the pressure difference between the outside air, which is the atmosphere outside the sleeve 11, and the gas inside the sleeve 11, the outside air in the space 88 around the plunger rod 19 at the rear end of the sleeve 11 is, If the molten metal 18 in the sleeve 11 flows into the storage space 75 through the gap between the plunger tip 20 and the sleeve 11, the molten metal 18 may bubble and scatter, or the molten metal 18A ) may fluctuate violently. If the molten metal 18 is shaken in this way, the amount of molten metal residue originating from the molten metal 18 in the sleeve 11 increases accordingly. Additionally, when the molten metal 18 is shaken, gas is likely to be mixed into the molten metal 18.

In this embodiment, the inflow of external air into the space 75 where the molten metal 18 in the suctioned sleeve 11 is stored is suppressed and the fluctuation of the molten metal 18 is suppressed, thereby removing the suction port caused by molten metal residue. The inside of the sleeve 11 is stably suctioned, avoiding clogging of the suction passages 14 to 17 and the suction path 51 or a decrease in suction efficiency.

Also, by suppressing the shaking of the molten metal 18, the mixing of gas into the molten metal 18 is suppressed, and thus the occurrence of blowholes can be prevented.

Hereinafter, desirable structural requirements of the injection device 1 will be described from a plurality of viewpoints.

First, with reference to FIGS. 4 to 8 and FIG. 13, a member (sliding seal 70 and seal member 79) for sealing between the outer peripheral portion of the plunger tip 20 and the inner peripheral portion of the sleeve 11 is installed. Explain. In order to more fully prevent the inflow of external air in response to thermal expansion of members such as the sliding seal 70, a configuration in which the sliding seal 70 and the seal member 79 are combined will be described below. However, the sliding seal 70 alone can prevent the inflow of external air into the front space 75 within the sleeve 11 and contribute to suppressing the movement of the molten metal. Therefore, it is sufficient for the injection device 1 to be provided with only the sliding seal 70 among the sliding seal 70 and the seal member 79.

Next, in order to prevent outside air from flowing into the front space 75 within the sleeve 11, both the front space 75 and the inside of the suction recess 120 of the plunger tip 20 are vacuumed. Explain about suction. Sequence of sleeve vacuum suction performed while suctioning the front space 75 and the inside of the suction recess 120 using the plurality of suction ports 14 to 17 of the sleeve 11 (FIGS. 11 and 14) will also be described including control examples (FIGS. 9 and 10).

In addition, regarding suction of both the front space 75 and the inside of the suction recess 120, the requirements according to the size of each part of the sleeve 11 and the size of each part of the plunger tip 20 are mainly concerned. This will be explained with reference to FIG. 12.

Additionally, supply of the sealant to the outer peripheral portion of the plunger tip 20 will also be explained with reference to FIG. 15 .

Additionally, if the injection device 1 is provided with a sliding seal 70 or provided with a sliding seal 70 and a seal member 79, there is no need to necessarily use a sealant.

With reference to FIGS. 4 to 7 , prevention of external air from entering the sleeve 11 will be described.

(Configuration of plunger)

First, the configuration of the plunger 12 (FIG. 4 (a), (b) and FIG. 5 (a)) will be described. As described above, the plunger 12 is provided with a plunger rod 19 and a plunger tip 20 provided on its front side.

Hereinafter, the radial direction of the plunger 12 or the sleeve 11 is referred to as the radial direction D2. The radial direction D2 is perpendicular to the advance/retreat direction D1.

In addition, the circumferential direction of the plunger 12 or the sleeve 11 is referred to as the circumferential direction D3. The circumferential direction of the cross section of the plunger 12 shown in Fig. 4(b) corresponds to the circumferential direction D3.

The plunger rod 19 is joined to the plunger tip 20 by a tip joint 20D. A male thread (not shown) provided at the rear end of the tip joint 20D is fastened with a female thread portion of the rod 19. A male thread (not shown) provided on the front end of the tip joint 20D is fastened with a female thread portion of the tip 20. The outer peripheral portion 203A of the small diameter portion 203 of the tip 20 is formed with a width across both surfaces 203B (FIG. 4(b)) that engages with a tool for fastening work.

When the plunger rod 19 is driven in the axial direction, the entire plunger rod 19 and the plunger tip 20 advance or retreat along the advance/retract direction D1.

The plunger tip 20 has a larger diameter than the diameter of the plunger rod 19, and extrudes the molten metal 18 stored in the sleeve 11 toward the front when the plunger 12 advances.

In order to suppress thermal expansion of the plunger tip 20, a mechanism (not shown) for circulating a cooling medium such as water is provided inside the plunger tip 20. The plunger tip 20 is cooled by a cooling medium flowing through a passage (not shown) formed inside the plunger tip 20.

The plunger tip 20 has an outer diameter corresponding to the inner diameter of the sleeve 11, and slides the inner peripheral portion 11A of the sleeve 11 as the plunger 12 advances and retreats. At this time, in detail, the sliding seal 70 provided on the plunger tip 20 slides the inner peripheral portion 11A of the sleeve 11. If the plunger tip 20 is worn after long-term use of the injection device 1, the worn plunger tip 20 can be exchanged for a new one. In this embodiment, the rod 19 does not slide on the inner peripheral portion 11A of the sleeve 11. Therefore, even if the plunger tip 20 is replaced, the rod 19 can be continuously used, which is economical.

As shown in (a) of FIG. 5, the plunger tip 20 has a first large diameter portion 201 located on the front side of the advance and retreat direction D1, a first large diameter portion 201 located on the rear side of the advance and retreat direction D1, and a first large diameter portion 201 located on the front side of the advance and retreat direction D1. A second large-diameter portion 202 is provided between the large-diameter portion 201 and dividing the suction recess 120. The diameter of the plunger tip 20 at the position of the suction recess 120 is small compared to the diameters of the first large-diameter portion 201 and the second large-diameter portion 202. Therefore, the section between the first large-diameter portion 201 and the second large-diameter portion 202 in the axial direction D1 of the plunger tip 20 is called the small-diameter portion 203.

The plunger tip 20 can be appropriately divided into a plurality of members.

The diameter of the first large-diameter portion 201 and the diameter of the second large-diameter portion 202 may be determined to be the same, but are not limited to this. The diameter of the first large-diameter portion 201 and the diameter of the second large-diameter portion 202 are slightly different, and the inner peripheral portion 11A of the sleeve 11, the outer peripheral portion of the first large-diameter portion 201, and the second large diameter portion 202 are slightly different from each other. Different clearances may be set between the outer peripheral portions of the neck portion 202.

The suction recess 120 is recessed inward in the radial direction D2 with respect to the inner peripheral portion 11A of the sleeve 11 and is continuous in the circumferential direction D3.

Since this recessed portion 120 for suction is continuous around the entire circumference of the plunger tip 20, the inner peripheral portion 11A of the sleeve 11 and the small diameter portion corresponding to the recessed portion 120 for suction ( A gap representing an annular cross-section is formed between the outer peripheral portions 203A of 203).

The injection device 1 is provided with a sliding seal 70 and a seal member 79 on the plunger tip 20, as shown in Figures 4 (a), (b) and Figure 5 (a). The main feature is that it has By sealing the gap between the outer peripheral portion 20C of the plunger tip 20 and the inner peripheral portion 11A of the sleeve 11 with these sliding seals 70 and seal members 79, the molten metal 18 is sealed. Prevents the inflow of external air into the stored front space (75).

The injection device 1 of this embodiment is provided with two sliding seals 70 side by side in the advance and retreat direction D1 and two seal members 79 side by side in the advance and retreat direction D1.

The number of sliding movement seals 70 may be one or three or more. The same goes for the number of seal members (79).

In this embodiment, both the two sliding seals 70 and the two seal members 79 are provided in the second large-diameter portion 202 posterior to the suction recess 120.

The sliding seal 70 and the seal member 79 can be provided on either or both of the first large-diameter portion 201 and the second large-diameter portion 202.

(Sliding movement seal)

The sliding seal 70 (FIGS. 4 (a), (b) and FIG. 5 (a)) extends in the circumferential direction D3 along the outer periphery of the second large diameter portion 202 of the plunger tip 20. It's continuing. The sliding seal 70 includes a discontinuous portion 71, which is a discontinuous location in a part of the circumferential direction D3, and is formed in an annular shape. As shown in Fig. 4(b) and Fig. 6, the sliding seal 70 is a member formed in a substantially circular ring shape.

The sliding seal 70 shown in FIG. 6 is outside the sleeve 11, and no external force is acting on it. In this way, the outer diameter of the sliding seal 70 in the no-load state is large compared to the inner diameter of the sleeve 11. When this sliding seal 70 is provided around the axis of the second large diameter portion 202 of the plunger tip 20 and is inserted into the sleeve 11 as shown in Figures 4 (a) and (b), The sliding seal 70 is elastically deformed to narrow the size of the gap in the discontinuous portion 71 and reduce the diameter of the sliding seal 70.

At this time, the sliding seal 70 presses the inner peripheral portion 11A of the sleeve 11 toward the outside in the radial direction D2 by elastic force. Due to the elastic force of this sliding seal 70, the space between the outer peripheral portion 70B of the sliding seal 70 and the inner peripheral portion 11A of the sleeve 11 is sealed.

The sliding seal 70 is made of metal materials such as carbon tool steel, hot-rolled tool steel (JIS G4404 SKD61), and copper alloy (for example, beryllium copper), which have the heat resistance and wear resistance required when using the injection device 1. Consists of.

Manufacturing of the sliding seal 70 can be performed, for example, by cutting from a block of the above-mentioned metal material. Alternatively, by performing processing such as punching on a plate using the above-mentioned metal material, a member in the form of a plate-shaped expansion of the sliding seal 70 is obtained, and bending processing is performed on the member, thereby forming an original shape. A sliding seal (70) formed into an annular shape can be obtained.

The diameter of the sliding seal 70, the plate thickness (dimension in the radial direction D2), the width (dimension in the advancing/retracting direction D1), and the size of the gap in the discontinuous portion 71 are determined by the elasticity and rigidity required for sealing, etc. It can be determined appropriately by taking into account.

The diameters of each of the plurality of sliding seals 70 are typically the same. However, this does not apply when the size of the gap between the mounting position of each sliding seal 70 on the plunger tip 20 and the inner peripheral portion 11A of the sleeve 11 is different.

The sliding seal 70 can be provided on the plunger tip 20 by an appropriate method. In this embodiment, the sliding seal 70 is provided on the plunger tip 20 using an annular seal holding member 72 that holds the sliding seal 70 in the second large diameter portion 202. there is. The seal holding member 72 is fixed to the plunger tip 20 in a state that supports the sliding seal 70 from the rear side.

The seal holding member 72 can be made of a metal material similar to the metal material that can be used for the sliding seal 70. This seal holding member 72 may be an annular member continuous over the entire circumference, or may be composed of a plurality of members divided in the circumferential direction D3.

The seal holding member 72 can be given an appropriate diameter so that it can hold the sliding seal 70.

A predetermined clearance can be provided between the outer peripheral portion 72A of the seal holding member 72 and the inner peripheral portion 11A of the sleeve 11. Making this clearance small contributes to suppressing the inflow of external air into the front space 75. Additionally, the seal holding member 72 is allowed to contact the inner peripheral portion 11A of the sleeve 11.

When the plunger tip 20 is assembled with a plurality of members including the sliding seal 70 and the seal retaining member 72, the sliding seal 70 is sandwiched between the members from both sides in the axial direction D1. status is supported. For example, in Figure 4(a), the sliding seal 70 on the right is sandwiched between two seal holding members 72, and the sliding seal 70 on the left is held between the seal holding members 72. ) and the front end portion 202A of the second large diameter portion 202. Therefore, when the plunger 12 advances and retreats, the axial position of the sliding seal 70 is prevented from being misaligned.

A detailed specific example of the discontinuous portion 71 of the present embodiment will be described.

Since the discontinuous portion 71 prevents outside air from blowing through, as shown in FIGS. 5 (a) and (b) and FIG. 6, the first gap 711, the second gap 712, It is preferable to include a partition 715 connecting the first gap 711 and the second gap 712.

The first gap 711 and the second gap 712 are shifted from each other in the circumferential direction D3, and are also shifted from each other in the advancing and retreating direction D1.

The sliding seal 70 has one end 701 and the other end 702 over the entire width direction D1 by the first gap 711, the second gap 712, and the dividing portion 715. It is divided into separable parts.

The first gap 711 and the second gap 712 may be arranged as shown in FIG. 5(c). The positions of the first gap 711 and the second gap 712 in the respective circumferential direction D3 are changed in FIGS. 5(b) and 5(c).

Hereinafter, description will be made based on the example shown in Figure 5(b).

As shown in (b) of FIG. 5, one end 701 and the other end 702 of the sliding seal 70 are circumferentially disposed across the first gap 711 and the second gap 712. They are facing in the direction (D3).

Both one end 701 and the other end 702 are formed in a hook shape.

On the front side of one end portion 701, a front convex portion 701A is formed that protrudes toward the other end portion 702. On the rear side of the other end portion 702, a rear convex portion 702A is formed that protrudes toward the one end portion 701.

In addition, the one end 701 and the other end 702 of the sliding seal 70 do not necessarily have to be formed in a hook shape, and may simply be formed linearly along the axial direction D1. A preferred configuration example (FIGS. 13(a) and 13(b)) when the one end 701 and the other end 702 are formed linearly will be described later.

The first gap 711 is adjacent to the front side of the rear convex portion 702A and is defined between the front end and the other end 702 of the front convex portion 701A.

The second gap 712 is adjacent to the rear of the front convex portion 701A and is defined between the tip and one end 701 of the rear convex portion 702A.

The dimensions of the first gap 711 in the circumferential direction D3 and the circumferential direction D3 of the second gap 712 are set equal, but may be different.

The division portion 715 consists of an edge portion of the region 702A adjacent to the rear side of the first gap 711 and an edge portion of the region 701A adjacent to the front side of the second gap 712. This division 715 is formed along the front end surface 702B of the rear convex part 702A and the rear end surface 701B of the front convex part 701A.

The front convex portion 701A of one end 701 and the rear convex portion 702A of the other end 702 are located inside the width direction D1 while leaving the first gap 711 and the second gap 712. The end surfaces 701B and 702B are arranged to collide with each other. It is desirable that there is no gap between the end surfaces 701B and 702B.

According to the amount of deformation in the radial direction D2 of the sliding seal 70, the relative positions of the front convex portion 701A and the rear convex portion 702A in the circumferential direction D3 change, thereby creating a first gap. The dimensions of 711 and the second gap 712 change.

The length of the front convex portion 701A and the rear convex portion 702A in the circumferential direction D3 and the dimensions of the first and second voids 711 and 712 in the circumferential direction D3 are those of the injection device 1. Even if the dimensions of the first and second voids 711 and 712 are expanded due to thermal expansion of the sleeve 11 and the sliding seal 70 during use, the end surfaces 701B and 702B are in a state where they collide with each other. It is desirable to set it appropriately so that it is maintained.

The division portion 715 of the present embodiment extends along a direction orthogonal to the width direction D1 with respect to the center of the width direction of the sliding seal 70.

Additionally, the division portion 715 may be shifted forward or backward from the center of the sliding seal 70 in the width direction.

In order to suppress outside air from flowing into the front space 75 through the discontinuity 71, each discontinuity 71 of the two sliding seals 70 is shown in FIGS. 4(a) and 6. As mentioned above, it is preferable that they are spaced apart from each other in the circumferential direction D3. If the positions of the discontinuities 71 in the circumferential direction D3 are different, unlike in the same case, the outside air cannot pass straight between the discontinuities 71, 71, and the resistance given to the outside air is large. am.

In this embodiment, the respective discontinuities 71 of the two sliding seals 70 are spaced 180° apart from each other.

It is preferable that the relative rotation of the two sliding seals 70 is regulated using a pin or the like so that the relative positional relationship of the discontinuous portion 71 of the two sliding seals 70 is maintained. To regulate the rotation of the two sliding seals 70, for example, a seal retaining member 72 located between the two sliding seals 70 can be used. In this case, even if the two sliding seals 70 and the seal holding member 72 rotate integrally around the axis, the relative positional relationship of the discontinuous portion 71 of the two sliding seals 70 does not change. Without this, the discontinuity 71 can remain shifted by 180°.

Even if the seal holding member 72 located between the two sliding seals 70 is omitted, installation of a rotation stop, etc. to the two sliding seals 70, and other seal holding members 72 and 2 By using the front end portion 202A of the large diameter portion 202, the rotation of the two sliding seals 70 can be regulated.

When the seal holding member 72 located between the two sliding seals 70 is omitted, the two sliding seals 70 are used similarly to the sliding seals 81 and 82 shown in FIG. 13. They may be arranged close to each other, and the boundary of these sliding seals (70) may be sealed from the radial inner side by a seal member (79).

(absence of seal)

Next, the seal member 79 (FIGS. 4(a), 5(a), and 6) is disposed inside the sliding seal 70 in the radial direction D2. The seal member 79 is a so-called O-ring made of a rubber-based material and composed of a continuous annular shape.

The seal member 79 is bent in the radial direction D2 between the sliding seal 70 and the second large diameter portion 202 of the plunger tip 20, and is shown in Figs. 4(b), 7(a), and As shown in (b), the gap (Gp) between them is sealed. The seal member 79 is pressed against the inner peripheral portion 70A of the sliding seal 70 and the outer peripheral portion 20C of the second large diameter portion 202 by the elastic force in the radial direction D2, thereby forming a gap Gp. ) is sealed.

The seal member 79 has a sufficiently small elastic modulus compared to the sliding seal 70. Therefore, even if the gap Gp widens due to thermal expansion of the sleeve 11 and the sliding seal 70, a sufficient amount of elastic deformation can be secured in the seal member 79 to close the gap Gp. .

Additionally, the sleeve 11 is typically constructed using steel for hot molding.

Since the seal member 79 does not directly contact the inner peripheral portion 11A of the sleeve 11, the influence of frictional heat due to the advance and retreat of the plunger 12 is small, and compared to the sliding seal 70. Therefore, since it is located inside the radial direction D2, it is typically close to the inside of the water-cooled plunger tip 20. Therefore, the heat resistance required for the seal member 79 is low compared to that of the sliding seal 70. Therefore, a rubber-based material that generally has lower heat resistance compared to a metal material can be used for the seal member 79.

In addition, since the temperature on the rear end 20B side of the tip 20 in contact with the molten metal 18 is lower than that on the front end 20A side of the tip 20, from the viewpoint of heat resistance, the second large diameter portion 202 in the tip 20 ) is preferably provided with a sliding seal 70 and a seal member 79.

The seal member 79 is made of an appropriate rubber-based material such as fluororubber, silicone rubber, chloroprene rubber, nitrile rubber, acrylic rubber, etc., from the viewpoint of heat resistance required when using the injection device 1 and rigidity required for encapsulation, or polypropylene. Resin-based materials such as tetrafluoroethylene (PTFE) and polyamide (PA) can be used. For the seal member 79 of this embodiment, fluororubber with a heat-resistant temperature of approximately 200°C is used.

The dimensions of the seal member 79, such as the outer diameter, inner diameter, and cross-sectional diameter, are appropriate so that when the gap Gp is widened to the maximum, the seal member 79 reduces the amount of elastic deformation and maintains the state of sealing the gap Gp. You can decide

As shown in FIGS. 7A and 7B , the seal member 79 is held inside a seal retaining groove 202C that is concave from the outer peripheral surface 202B of the second large diameter portion 202. The seal retention groove 202C is formed in an annular shape over the entire circumference of the second large-diameter portion 202 along the circumferential direction D3.

The seal member 79 is held in the seal retaining groove 202C, so that the positional difference in the forward and backward direction D1 is regulated.

As shown in Figures 7 (a) and (b), a sliding seal 70 is disposed around the seal member 79 held in the seal retaining groove 202C. The seal member 79 is formed in the width direction D1 of the sliding seal 70 so as to seal the divided portion 715 in the discontinuous portion 71 of the sliding seal 70 from the inside in the radial direction D2. It is preferably disposed at the position (center in the width direction) of the division portion 715 in . In the example shown in FIG. 7(b), the outer end 79A with the largest diameter in the seal member 79 is divided along the circumferential direction D3 in which the divided portion 715 extends ( 715) and its vicinity are in close contact.

If the divided portion 715 connecting the first gap 711 and the second gap 712 is sealed by the seal member 79 from the inside in the radial direction D2, the sliding seal 70 It is possible to avoid that the outside air flowing into the rear second air gap 712 flows into the front first air gap 711 through the inside in the radial direction D2.

(Manufacture of injection device with sliding seal and seal member)

First, the plunger tip 20 equipped with the seal member 79 and the sliding seal 70 and the plunger rod 19 are assembled to manufacture the plunger 12 (FIG. 5(a)).

When attaching the seal member 79 and the sliding seal 70 to the plunger tip 20, attach the seal member 79 to the seal retaining groove 202C of the second large diameter portion 202 of the plunger tip 20. In the holding state, the sliding seal 70 and the seal holding member 72 are inserted around the seal member 79 in a predetermined order in the axial direction from the rear end side of the second large diameter portion 202.

Next, the plunger 12 is inserted into the sleeve 11. At this time, as the plunger 12 advances relative to the sleeve 11, it slides on the drawing tapered surface 11C (FIG. 4(a)) formed on the rear end 11B of the sleeve 11. The sliding seal 70 is guided and elastically deformed inward in the radial direction D2, thereby reducing the diameter of the sliding seal 70. Accordingly, the seal member 79 is pressed between the inner peripheral portion 70A of the sliding seal 70 and the outer peripheral portion 20C of the plunger tip 20 and is elastically deformed in the radial direction D2.

When the plunger 12 is inserted into the sleeve 11, as shown in Figures 7 (a) and (b), the sliding seal 70 moves the inner peripheral portion 11A of the sleeve 11 in the radial direction ( By pressing with D2), the seal member 79 presses the inner peripheral portion 70A of the sliding seal 70 and the outer peripheral portion 20C of the plunger tip 20. For this reason, the gap between the inner peripheral portion 11A of the sleeve 11 and the outer peripheral portion 20C of the plunger tip 20 is sealed.

The injection device 1 is manufactured through the step of attaching the sliding seal 70 and the seal member 79 to the plunger 12 and the sleeve 11 in the above state.

The injection device 1 is not limited to a newly manufactured one, and may be obtained by modifying an existing injection device by adding a sliding seal 70 and a seal member 79. In the case of the number of existing devices, similarly to the above, the sliding seal 70 and the seal member 79 are mounted on the plunger 12 and the sleeve 11, and the sliding seal 70 and The injection device 1 provided with the seal member 79 can be manufactured.

(Action and effect due to sliding seal and absence of seal)

In the casting process using the die casting machine 100, in order to suppress air from entering the molten metal 18, at least the molten metal ( The space 75 where 18) is stored is depressurized by suction.

In this way, the action and effect of the sliding seal 70 and the seal member 79 will be explained below regarding the casting that performs vacuum suction within the sleeve 11.

In this embodiment, the space 75 ahead of the front end 20A of the plunger tip 20 and the inside of the suction recess 120 are sucked by the vacuum suction system 2. Suction of the inside of the suction recess 120 is not necessarily a prerequisite for obtaining the actions and effects described below.

When casting using the die casting machine 100 is started, the sleeve 11 and the sliding seal 70 are thermally expanded by the heat of the molten metal 18, thereby enlarging the diameter. The sliding seal 70 follows the sleeve 11 and expands in diameter due to thermal expansion and elastic force outward in the radial direction D2. The seal member 79 also expands in diameter due to thermal expansion.

Meanwhile, the plunger tip 20 is typically water-cooled, and heat is radiated from the rod 19 to the outside air when the plunger 12 is retracted with respect to the sleeve 11. Therefore, it can be said that the diameter of the plunger tip 20 also expands due to thermal expansion, and compared to the sleeve 11, the sliding seal 70, etc., the amount of deformation of the plunger tip 20 due to thermal expansion is small.

Due to the above, the inner peripheral portion 70A of the sliding seal 70 and the outer peripheral portion 20C of the second large diameter portion 202 of the plunger tip 20 are spaced apart in the radial direction D2, and a gap Gp ( It is said that Figure 4(b)) is enlarged.

However, since the seal member 79 is in an elastically deformed state and is pressed against the outer peripheral portion 20C of the plunger tip 20 and the inner peripheral portion 70A of the sliding seal 70, the gap Gp is sealed. is maintained in its current state.

Furthermore, in this embodiment, outside air is also prevented from blowing forward through the discontinuous portion 71 of the sliding seal 70. Even if outside air flows into the second gap 712 of the discontinuous portion 71 from the rear, the rear cross section 701B of the area adjacent to the front side of the second gap 712 (front convex portion 701A) ( Since Fig. 5(a) and Fig. 7(a) and (b)) function as walls that shield external air, external air does not flow straight from the second gap 712 to the first gap 711. Therefore, by providing resistance to the outside air, it is possible to suppress the outside air from passing through the discontinuous portion 71.

In more detail about the discontinuous portion 71, the end face 701B of the front convex portion 701A and the end face 702B of the rear convex portion 702A, which constitute the divided portion 715, collide without a gap. By doing this, it is possible to prevent the outside air that has collided with the rear end surface 701B (wall) of the front convex part 701A from flowing into the first air gap 711 through between the end surfaces 701B and 702B, which are the divided portions 715. You can.

In addition, since the divided portion 715 is sealed from the inside in the radial direction D2 by the seal member 79, the outside air flowing into the second gap 712 passes through the inside in the radial direction D2. Inflow into the first air gap 711 can also be avoided.

And, even if a part of the outside air blows through the sliding seal 70 and the seal member 79 located upstream (rear) of the outside air, another sliding seal 70 located downstream (front) of the outside air And the seal member 79 can prevent outside air from blowing through.

If a plurality of sliding seals 70 are arranged side by side in the advance and retreat direction D1 as in the present embodiment, the wall 701B in the discontinuous portion 71 with respect to the flow of outside air from the rear to the front. As the number increases, the effect of shielding the flow of external air improves.

In addition, if the discontinuities 71 of the upstream sliding seal 70 and the downstream sliding seal 70 are spaced apart in the circumferential direction D3, the discontinuity 71 of the upstream sliding seal 70 ) does not go straight to the discontinuity 71 of the downstream sliding seal 70. In this respect as well, the effect of shielding the flow of external air is improved.

According to the action of the sliding seal 70 and the seal member 79 described above, the outer peripheral portion 20C of the plunger tip 20 and the inner peripheral portion of the sleeve 11 are formed during continuous production of the product by casting. Both the outer and inner sides of the gap between 11A in the radial direction D2 are sealed. Therefore, even if a pressure difference occurs between the inside of the sleeve 11 from which gas is vented and the outside air, it is possible to prevent outside air from flowing in ahead of the sliding seal 70 and the seal member 79.

As a result, since the shaking of the molten metal 18 is suppressed, the inside of the sleeve 11 is prevented from clogging of the suction ports 14 to 17 and the suction path 51 or a decrease in suction efficiency due to molten metal residue. The occurrence of blowholes can be prevented by reducing the pressure to a vacuum level of .

According to this embodiment, the sliding seal 70 and the seal member 79 can increase the airtightness within the sleeve 11 and suppress the shaking of the molten metal 18. Therefore, in order to improve the airtightness within the sleeve 11, there is no need to employ an expensive plunger tip exclusively for high vacuum die casting in the injection device 1.

In addition, the gap that changes in the radial direction D2 due to thermal expansion of the sleeve 11, etc. is maintained in a sealed state by the sliding seal 70 and the seal member 79, so that ceramic-based materials, cermets, etc. There is no need to employ an expensive sleeve 11 made of a material with a low coefficient of thermal expansion.

As a result, the quality of the cast product can be improved by suppressing the generation of blowholes by vacuum suction within the sleeve 11 while suppressing the equipment cost.

According to this embodiment, in conventional sleeve vacuum suction where the suction hole or path is likely to be suddenly blocked due to molten metal residue, blockage of the suction path or a decrease in suction efficiency is avoided, and stable suction is achieved inside the sleeve 11. can be realized. According to this embodiment, there is no need to perform vacuum suction by suppressing the vacuum degree or molten metal filling rate within the sleeve in order to avoid blockage of the path, etc., so sleeve vacuum suction with high vacuum degree and high filling rate can be realized.

(Variation example of sliding motion seal)

The injection device 1 shown in Fig. 8(a) is provided with one sliding seal 70 and one seal member 79.

The injection device 1 shown in Fig. 8(b) is provided with three sliding seals 70 and two seal members 79. As shown in this example, the seal member 79 does not necessarily have to be disposed inside the radial direction D2 of the sliding seals 70 for the total number of sliding seals 70. Among the sliding seals 70 parallel to the forward and backward direction D1, it is allowed to arrange the seal member 79 only for the sliding seal 70 that requires sealing inside the radial direction D2.

As shown in this example, the sliding seals 70 and seal members 79 do not necessarily have to be the same number.

As already explained, it is preferable that the discontinuous portions 71 of neighboring sliding seals 70 are spaced apart from each other in the circumferential direction D3, as shown in (b) of FIG. 8. This is to suppress outside air blowing and passing through the discontinuity 71.

As shown in Fig. 8(c), the discontinuous portion 71 may be formed in a step shape. This discontinuity 71 includes a first gap 711, a second gap 712, a third gap 713, a first division 715, and a second division 716. Consists of. The first division 715 and the second division 716 are each sealed from the inside in the radial direction D2 by a seal member 79.

In addition, as shown in (d) of FIG. 8, first to third gaps 711 are formed between one end 701 in which the concave portion 717 is formed and the other end 702 in which the convex portion 718 is formed. to 713) may be arranged. In this example, the first divided portion 715 and the second divided portion 716 are sealed from the inside in the radial direction D2 by one seal member 791.

Referring to Figures 13 (a) and (b), the sliding seals 81 and 82, which include linear discontinuities 80 and are formed in an annular shape, will be described. In addition, the step of vacuum suction of the sleeve by the injection device 6 having the configuration shown in Fig. 13 (a) and (b) will be described later with reference to Fig. 14 (a) to (c).

The injection device 6 shown in FIG. 13(a) includes a first sliding seal 81 and a second sliding seal 82 adjacent to each other in the advancing/retracting direction D1, and one seal member 79. It is equipped with

Each discontinuous portion 80 of the adjacent first and second sliding seals 81 and 82 is formed linearly along the axial direction D1. These discontinuities 80 are preferably shifted from each other in the circumferential direction D3. Here, the respective discontinuities 80 of the first and second sliding seals 81 and 82 are spaced apart by 180° from each other.

And, the boundary 80B of the first and second sliding seals 81 and 82 is sealed from the inside in the radial direction D2 by a seal member 79, as shown in FIG. 13(b). It is done. In the example shown here, the outer end 79A of the seal member 79 is in close contact with the boundary 80B and its vicinity along the circumferential direction D3 in which the boundary 80B extends.

The discontinuous portion 80 of the first sliding seal 81 corresponds to the first gap 711 in the embodiment shown in FIGS. 5(a) and 5(b).

The discontinuous portion 80 of the second sliding seal 82 corresponds to the second gap 712 in the above embodiment.

The boundary 80B in the axial direction D1 between the first sliding seal 81 and the second sliding seal 82 corresponds to the division portion 715 in the above embodiment.

Therefore, according to the configuration shown in Figures 13 (a) and 13 (b), sliding seals 81 and 82 made of simple processing are used compared to the sliding seal 70 of the above embodiment, Similar to the above embodiment, the effect of preventing external air from flowing into the front space 75 within the sleeve 11 can be obtained.

(Suppression of external air inflow by suction of suction recess)

In this embodiment, as described above, in addition to the suction from the space 75 in front of the front end 20A of the plunger tip 20 in the sleeve 11, the suction recess 120 is further behind it. ), both the space 75 and the inside of the suction recess 120 are depressurized with respect to atmospheric pressure.

In this embodiment, the inside of the suction recess 120 is sucked through the suction ports 14 to 17. It is not limited to this, and for example, it is also allowed to suction the inside of the suction recess 120 through a hole formed in the axial direction of the second large diameter portion 202. Since the axial hole is always in communication with the inside of the suction recess 120 regardless of the position of the plunger 12 in the advance/retract direction D1, the axial hole is always in communication from the start of sleeve vacuum suction to the end. The inside of the suction recess 120 can be sucked through the hole.

According to the suction inside the front space 75 and the suction recess 120, a space (for suction) whose pressure is equal to that of the front space 75 is located behind the front space 75 in the sleeve 11. By providing a concave portion (inside the concave portion 120), it is possible to prevent external air outside the sleeve 11 from flowing into the front space 75 within the sleeve 11. This means that there is no difference between the pressure P1 inside the suction recess 120 and the pressure P2 in the space 75, or even if there is a pressure difference, the pressure difference (P1-P2) is atmospheric pressure. Since the difference (P0-P2) between the pressure (P2) between (P0) and the front space (75) is sufficiently small, the outside air flows into the front space (75) through the inside of the suction concave portion (120). Because it is suppressed.

When the plunger 12 moves forward, both the front space 75 and the inside of the suction recess 120 are continuously sucked, and the front space 75 stores the molten metal 18 while the plunger 12 is sucked. It can suppress the inflow of external air into. While the front space 75 is being suctioned, the inside of the suction concave portion 120 is continuously suctioned, thereby preventing the inflow of external air into the front space 75 at all times while the front space 75 is being suctioned. It is desirable to suppress it.

In this embodiment, based on the configuration of the vacuum suction system 2 (FIG. 2) described above, suction inside the front space 75 and the suction recess 120 is performed by one vacuum suction system 2. can be in charge. The gas sucked from the front space 75 and the gas sucked from the inside of the suction recess 120 pass through the same vacuum tank 36 and are sucked by the same vacuum pump 37.

Therefore, compared to the case where the vacuum suction system is individually provided inside the front space 75 and the suction recess 120, the cost of devices such as the vacuum pump 37 and the vacuum tank 36 can be reduced. You can. In addition, since the number of vacuum suction systems is small, there are few inspection points for gas leaks, so inspection work efficiency is good.

However, it is also allowed that the front space 75 and the inside of the suction recess 120 are suctioned through different systems.

The plunger tip 20 equipped with the above-mentioned sliding seal 70 and seal member 79 is inserted into the sleeve 11 and added to the front space 75 from the inside of the suction recess 120. By suctioning the molten metal 18, the inflow of external air into the front space 75 storing the molten metal 18 can be more reliably prevented.

Based on the difference between the pressure (P1) inside the suction recess 120 and the outside air pressure (P0), the outside air flows into the front space 75 through the inside of the suction recess 120. To prevent this, it is preferable to provide a sliding seal 70 and a seal member 79 in at least the second large diameter part 202 among the first and second large diameter parts 201 and 202.

The front space 75 from the inside of the suction recess 120 based on the difference (P1-P2) between the pressure P2 of the front space 75 and the pressure P1 inside the suction recess 120. From the viewpoint of preventing outside air from flowing into the first large diameter portion 201, a sliding seal 70 and a seal member 79 may be provided.

(Continuous suction of the anterior space and suction recess by multiple suction ports)

Next, continuous suction of the inside of the front space 75 and the suction recess 120 through the plurality of suction ports 14 to 17 will be explained.

From the beginning to the end of the injection process, which is performed by advancing the plunger 12, continuously from the inside of the front space 75 and the suction recess 120 over a period as long as possible and as continuously as possible. Aspiration is preferable. This is to suppress the inflow of external air into the front space 75 storing the molten metal 18 and to stably, continuously and sufficiently suction gas from the front space 75.

The plunger 12 is, for example, from the retreated position shown in Fig. 11 (a) to the fourth suction port ( When 17) advances to the position closed by the tip 20, the front end 20A of the plunger tip 20 moves through the first suction port 14, the second suction port 15, and the third suction port 16. ), and passes through each position of the suction ports 14 to 17 in that order, the fourth suction port 17.

In the injection filling process in this embodiment, the plunger 12 is advanced with respect to the sleeve 11 and the front space 75 is sucked through at least one suction port communicating with the front space 75, The inside of the suction recess 120 is suctioned through at least one suction port communicating with the inside of the suction recess 120.

As shown in (b) to (e) of FIG. 11, when the plunger 12 advances, the suction ports 14 to 17 are selectively moved according to the position of the plunger 12 advancing with respect to the sleeve 11. At least one communicates with the front space 75, and at least one selectively communicates with the inside of the suction recess 120 among the suction ports 14 to 17.

According to this configuration, while the front space 75 is being suctioned, the suction recess 120 is supplied through one or more suction ports that communicate with the front space 75 and the inside of the suction recess 120, respectively. By constantly suctioning the inside, the inflow of external air into the front space 75 can be suppressed.

Next, after explaining each casting process with reference to FIGS. 9 and 10, vacuum suction within the sleeve 11 will be explained based on specific examples shown in FIGS. 11(a) to 11(f).

(Casting method, control example of sleeve vacuum suction)

First, each casting process will be described with reference to FIGS. 9 and 10.

Hereinafter, vacuum suction by the vacuum suction system 2 will be referred to as “sleeve vacuum.”

Figure 9 shows a flow chart of the casting method by die casting. As shown in the flow chart, each process proceeds under control by the control device 3 in the following order, starting from the start of die casting, mold clamping, pouring, starting injection, and sleeve vacuum.

If the sleeve vacuum process is not performed (No in step S11), the process proceeds in the following order: increased pressure conversion command, cooling (solidification), mold opening, product ejection, product detection, mold spray, injection retraction, and tip lubrication. , the next cycle begins (if Yes in step S12).

On the other hand, when performing sleeve vacuum (Yes in step S11), processing by circuit A (FIG. 10) is performed, and further, pressure increase conversion command, cooling (solidification), mold opening, product ejection, and product detection are performed. , the process proceeds in the following order: mold spraying, injection retraction, and tip lubrication.

In addition, part of the processing by the circuit A (FIG. 10) is executed before the process of the pressure increase switching command, and the remainder is executed in parallel with the process after the pressure increase switch command. In general, steps S101 to S113 can be executed before the process of the pressure increase switching command, and steps S114 to S118 can be executed in parallel with the process after the pressure increase switch command.

Hereinafter, processing by circuit A, which is a control circuit, will be described with reference to FIGS. 10 and 2. Processing by circuit A is also executed under control by control device 3.

The sleeve vacuum process from step S104 to step S111 shown in FIG. 10 shows the basic operation of the selection valve 33 corresponding to the suction ports 14 to 17.

At the start of sleeve vacuum, all suction ports 14 to 17 are assumed to be open. After the sleeve vacuum is started, the suction ports 14 to 17 are sequentially closed by the tip 20 of the plunger 12 advanced. As the plunger 12 advances, the tip 20 passes through the suction port. After the suction port is closed by the second large diameter portion 202 of the tip 20, the suction port is in a state where it does not communicate with the front space 75 or the inside of the suction recess 120, It cannot be used for sleeve vacuum that suctions from the inside of the front space 75 and the suction recess 120. Even if this suction port is not in communication with the front space 75 and the inside of the suction recess 120, the suction efficiency is maintained by suppressing the increase in pressure in the vacuum tank 36, and the molten metal is supplied to the suction port. To avoid debris entering, it is desirable to close the corresponding selection valve 33 after it is no longer in use.

Therefore, as explained below, as the plunger 12 advances, the plunger moves to a position closed by the second large diameter portion 202 of the plunger tip 20 for each of the suction ports 14 to 17. When (12) is reached, the selection valves 33 corresponding to the suction ports are sequentially closed.

That is, as the plunger 12 advances, the selection valves 33 corresponding to the suction ports 14 to 17 are sequentially closed.

The selection valve 33 is preferably closed while the corresponding suction port is in a closed state by the second large diameter portion 202 of the tip 20. When the second large-diameter portion 202 passes through the suction port and the suction port communicates with the space 88 in FIG. 4 around the plunger rod 19, if the selection valve 33 is open, , there is a possibility that outside air flows into the vacuum tank 36 from the space 88 via the suction port 51. Since this is not intended, for example, in the step shown in Figure 11 (d), the selection valve 33 corresponding to the suction port 14 in the closed state by the tip 20 is closed. .

The operation of the selection valve 33 described below is only an example. It is preferable that the selection valve 33 is properly closed not only due to unusability due to closure of each suction port, but also due to unusability of the suction path 51 and the like due to molten metal residue, as described above. Alternatively, it is possible to open and close the selection valves 33 corresponding to the suction ports 14 to 17, respectively, based on the manufacturing conditions depending on the mold or product.

In step S101, it is confirmed that the inside of the vacuum tank 36 has reached a sufficient degree of vacuum, and a signal of completion of preparation is sent.

In step S102, after pouring, the plunger 12 advances and passes the position where the pouring port 13 is closed, and then the vacuum suction system 2 starts the operation of vacuum suctioning the sleeve 11. A predetermined position in the advancing/retracting direction D1 of the plunger 12 can be determined as the vacuum start position where vacuum suction is started. Detection of the plunger 12 reaching the set vacuum start position is performed by detecting the stroke of the hydraulic cylinder driving the plunger 12 with a non-contact sensor or the like. The arrival of the plunger 12 to each set position in the following steps is similarly detected.

In step S103, the vacuum/air blow switching valve 35 is switched to vacuum suction.

In step S104, the plunger 12 reaches the set position (FIG. 2/first suction port closed position) that closes the first suction port 14.

In step S105, the selection valve 33 corresponding to the first suction port 14 is closed.

In step S106, the plunger 12 reaches the set position (FIG. 2/second suction port closed position) that closes the second suction port 15.

In step S107, the selection valve 33 corresponding to the second suction port 15 is closed.

In step S108, the plunger 12 reaches the set position (FIG. 2/third suction port closed position) that closes the third suction port 16.

In step S109, the selection valve 33 corresponding to the third suction port 16 is closed.

In step S110, the plunger 12 reaches the set position (FIG. 2/fourth suction port closed position) that closes the fourth suction port 17. Here, just before the plunger 12 reaches the set position that closes the fourth suction port 17, the degree of vacuum in the suction path 51 corresponding to the fourth suction port 17 is measured by the pressure detector 32. ) is measured using . The degree of vacuum of the fourth suction port 17 is managed by establishing upper and lower limit ranges. If the vacuum level is outside the set pressure, an alarm is sent by a lamp or buzzer, etc. Additionally, the upper and lower limits are preferably -90 to -100 kPa.

In step S111, the selection valve 33 corresponding to the fourth suction port 17 is closed.

In step S112, the vacuum/air blow switching valve 35 is shut off (neutral position).

In step S113, all selection valves 33 of each suction port 14 to 17 are opened.

In step S114, the vacuum/air blow switching valve 35 is switched to air blow.

In step S115, the pressurized air supply system 9, which has a part of the piping common to the vacuum suction system 2, uses the pressurized tank 38 and blows out air into the sleeve 11 through the suction port. Execute air blow. At this time, all of the selection valves 33 of each suction port 14 to 17 may be opened, or the selection valves 33 may be opened one by one in order. When air blowing has ended, the vacuum/air blow switching valve 35 is shut off (neutral position) (S118).

In step S116, while air blowing is being performed, the pressure in each suction path 51 of the suction ports 14 to 17 is measured by the pressure detection unit 32, and based on the pressure, the pressure inside the pipe or the vacuum filter 31 is measured. ) to determine whether there is a blockage. If a blockage occurs, an alarm is sent through a lamp or buzzer (step S117).

Additionally, the timing for executing the air blow in step S115 is during the casting cycle, after the plunger 12 advances within the sleeve 11 and reaches the suction port 17 that is furthest from the pouring port 13. As a result, it is sufficient as long as the vacuum suction in the sleeve 11 through each suction port is completed. For example, after the plunger 12 reaches the speed/pressure switching point described above and when the mold is opened, the cast product is securely held on the side of the movable mold 22 equipped with the product extrusion mechanism. Air blowing may be performed from the advanced position of the plunger 12 in the operation of extruding the plunger 12, which is in contact with the biscuit portion, to its advanced position.

Additionally, other than during the casting cycle, when selecting an operation mode by operating the switch that switches the operation mode of the die casting machine (1-cycle automatic operation mode/fully automatic operation mode at the start of casting), the operation mode is automatically switched when the switch is switched. Alternatively, the air blow in step S115 may be performed.

Above, the flow chart has been explained. Here, the sleeve 11 is vacuum-sucked using all of the suction ports 14 to 17 from the first suction port 14 to the fourth suction port 17, but in addition to this, the third suction port is used. Use two of the second suction port (16) and the fourth suction port (17), use three of the second suction port (15), the third suction port (16), and the fourth suction port (17), or a combination thereof. is free. There is no limit to the number of suction ports used.

The upper limit sleeve filling rate can be used to control opening and closing the selection valve 33 corresponding to each suction port 14 to 17.

The "upper limit sleeve filling rate" means that when the filling rate of the molten metal 18 in the sleeve 11 (referred to as sleeve filling rate) increases to a predetermined value (e.g. 80%), the cavity is discharged from the suction port where the plunger 12 reaches. This is the upper limit of the sleeve filling rate when the selection valve 33 belonging to the suction port close to (23) is fully closed.

Using this "upper limit sleeve filling rate" means that when the sleeve filling rate reaches a predetermined value, the selection valve 33 belonging to the suction port closest to the cavity 23 from the suction port where the plunger 12 has reached is completely closed. It refers to doing . Additionally, the upper limit sleeve filling rate can be freely set before carrying out casting.

The purpose of using the upper limit sleeve filling rate is to increase the sleeve filling rate and prevent molten metal residue from entering the suction path 51 from the suction ports 14 to 17 during vacuum suction. This is to vacuum-suction the sleeve 11 through the maximum number of suction ports without allowing molten metal residue to enter the suction path 51.

(Specific example of sleeve vacuum process)

Hereinafter, based on the specific example shown in FIGS. 11 (a) to 11 (f), continuous suction is carried out inside the front space 75 and the suction recess 120 through the plurality of suction ports 14 to 17. An example of a series of steps for performing suction is described.

Figures 11 (a) to (f) are diagrams explaining a series of steps in sleeve vacuuming. Figure 11 (a) is the sleeve vacuum preparation stage, Figure 11 (b) is the sleeve vacuum start stage, Figure 11 (c) is the sleeve vacuum first stage, Figure 11 (d) is the sleeve vacuum second stage, FIG. 11(e) shows the sleeve vacuum cavity side vacuum end step, and FIG. 11(f) shows the sleeve vacuum end step. The stages of sleeve vacuuming progress in the order of (a), (b), (c), (d), (e), and (f) in FIG. 11 as the plunger 12 advances.

In Figures 11 (a) to (f), the sliding seal 70, seal member 79, and seal holding member 72 are omitted. The same applies to Figures 12 (a) to (e).

Sleeve vacuum preparation steps:

In the sleeve vacuum preparation step shown in Fig. 11(a), the plunger 12 is stopped at the original position, which is the retracted position. Since the pouring port 13 is open, the molten metal 18 can be supplied into the sleeve 11 from the pouring port 13. At this time, the space 75 ahead of the front end 20A of the plunger tip 20 and the pouring port 13 are in communication.

The sleeve vacuum preparation step is a step of preparing to initiate sleeve vacuum. At this time, vacuum suction is not performed on all suction ports 14 to 17.

From the state shown in Fig. 11 (a), the plunger 12 extends from the state shown in Fig. 11 (a) to the position where the front end 20A of the tip 20 exceeds the pouring port 13 forward (the position indicated by the dashed line in Fig. 11 (a)). ) advances, the pouring port 13 is in a closed state by the first large diameter portion 201 of the plunger tip 20, and thereby the space 75 ahead of the front end 20A and the pouring port ( 13) is partitioned by the tip 20.

In addition, when the plunger 12 advances to a position (not shown) where the front end of the second large-diameter portion 202 exceeds the pouring port 13 forward, the pouring port 13 is moved by the second large-diameter portion 202. Since it is in a closed state, the inside of the suction concave portion 120 and the pouring port 13 are partitioned by the tip 20.

After this position, while the plunger 12 moves forward (including (b) to (f) in Fig. 11), the inside of the front space 75 and the suction recess 120 is tip ( 20), it is maintained in a partitioned state within the sleeve 11 at a distance from the pouring port 13.

After that, when the plunger 12 advances to a position where the inside of the suction recess 120 communicates with the rearmost suction port 14, as shown in FIG. 11(b), the suction recess 120 Since at least one suction port is in communication with the inside of the portion 120 and the front space 75, the air flows from both the front space 75 in the sleeve 11 and the inside of the suction recess 120. Aspiration also becomes possible.

Therefore, the position of the plunger 12 (vacuum start position) when starting the sleeve vacuum is inside the suction recess 120 and the front space 75, as shown in FIG. 11(b). It is preferable to set the position of the plunger 12 when at least one suction port is in a communicating state. When the plunger 12 reaches this position, it is desirable to immediately start suction of the anterior space 75 and the inside of the suction recess 120. By doing so, sufficient suction time can be secured, and the inside of the front space 75 and the suction recess 120 can be raised to a sufficient degree of vacuum.

Sleeve vacuum initiation steps:

In the sleeve vacuum start step shown in FIG. 11(b), sleeve vacuum is started through all suction ports 14 to 17. In the sleeve vacuum start step, first, the plunger 12 starts to advance from the retreated position, and the end surface of the second large diameter portion 202 on the cavity 23 side passes through the pouring spout 13. Next, the inside of the suction recess 120 and the front space 75 are vacuum-suctioned by the vacuum tank 36 through the entire suction ports 14 to 17 of the sleeve 11.

As shown in FIG. 11(b), when the plunger 12 is at the vacuum start position, the first suction port 14 communicates with the inside of the suction recess 120, and the front space 75 The second to fourth suction ports 15 to 17 are in communication with each other.

Therefore, vacuum suction is carried out on the inside of the suction recess 120 through the first suction port 14, and at the same time, or the timing is shifted, the second suction port 15 and the third suction port are sucked. Vacuum suction of the front space 75 can be performed through (16) and the three fourth suction ports (17).

At this time, the selection valves 33 corresponding to the second suction port 15, third suction port 16, and fourth suction port 17 may be opened at the same time, or may be opened by changing the timing. .

In order to suppress external air outside the sleeve 11 from flowing into the front space 75 through the inside of the suction recess 120, prior to the start of vacuum suction of the front space 75, the suction recess is It is desirable to initiate vacuum suction of the inside of the unit 120.

Sleeve Vacuum Step 1:

In the first stage of sleeve vacuum shown in FIG. 11 (c), the plunger 12 advances further, and the inside of the suction recess 120 becomes the first suction port 14 and the second suction port 15. becomes in a state of communication with Additionally, the front space 75 is in a state of communicating with the third suction port 16 and the fourth suction port 17.

Therefore, vacuum suction inside the suction recess 120 through two suction ports (the first suction port 14 and the second suction port 15) and the remaining suction port (the third suction port (15) 16), vacuum suction of the front space 75 can be performed through the fourth suction port 17).

Sleeve vacuum second stage:

In the second stage of sleeve vacuum shown in Fig. 11(d), the plunger 12 advances further, and the inside of the suction recess 120 communicates with one suction port (second suction port 15). It becomes one state. Additionally, the front space 75 is in a state of communicating with two suction ports (the third suction port 16 and the fourth suction port 17).

At this time, the second large-diameter portion 202 of the plunger tip 20 faces the first suction port 14, so that the first suction port 14 is closed and cannot be used. Therefore, by closing the selection valve 33 corresponding to the first suction port 14, the pressure reduction by the first suction port 14 is completed. Here, the selection valve 33 is closed when the first suction port 14 is closed by the second large diameter portion 202 of the tip 20 and is not in communication with the external space 88. It is assumed that

In Fig. 11 (d) to (f), the suction port in which the corresponding selection valve 33 is blocked is marked with “occluded”.

Among the first to fourth suction ports 14 to 17, the remaining suction ports 15 to 17 in which the corresponding selection valve 33 is not blocked are located in the front space 75 or the suction recess 120. ) is in communication with the inner side of the. Therefore, vacuum suction inside the suction recess 120 through one suction port (second suction port 15) and two suction ports (third suction port 16) and fourth suction port ( Vacuum suction of the anterior space 75 can be performed through 17)).

As the plunger 12 advances, the first sleeve vacuum stage shown in (c) of FIG. 11 and the second stage of sleeve vacuum shown in (d) of FIG. 11 are alternately repeated, and the inside of the sleeve 11 Vacuum suction is in progress.

That is, as the plunger 12 advances, vacuum suction inside the suction recess 120 through two suction ports (FIG. 11(c)) and suction recess through one suction port ( Vacuum suction (FIG. 11(d)) inside 120) is alternately repeated, and vacuum suction of the front space 75 through at least one suction port is continuously performed, and further, the unusable The selection valve 33 corresponding to the suction port is closed.

Sleeve vacuum cavity side vacuum termination steps:

Afterwards, as shown in FIG. 11(e), if the plunger 12 has advanced to the position where the frontmost fourth suction port 17 is closed by the tip 20, the front space 75 End suction. Until just before the fourth suction port 17 is closed, the front space 75 is suctioned through the fourth suction port 17, and suction is also performed from the inside of the suction recess 120.

As shown in (e) of FIG. 11, when the plunger 12 advances to the position where the frontmost fourth suction port 17 is closed by the first large diameter portion 201, the front space 75 is It is in a state where it is not in communication with any of the first suction port 14 to the fourth suction port 17. In this state, vacuum suction from the inside of the front space 75 and the suction recess 120 can be terminated (sleeve vacuum cavity side vacuum termination step). In this case, if the selection valve 33 corresponding to the fourth suction port 17 and the selection valve 33 corresponding to the third suction port 16 located at the position of the suction recess 120 are closed, good night.

Instead of ending the sleeve vacuum in the state shown in FIG. 11(e), the sleeve vacuum may be continued until the plunger 12 advances to the position shown in FIG. 11(f). This will be explained below.

As shown in FIG. 11(e), the fourth suction port 17 is closed by the first large diameter portion 201, so even if no suction port communicates with the front space 75, suction is achieved. The third suction port 16 communicates with the inside of the concave portion 120. That is, vacuum suction of the inside of the suction recess 120 through the third suction port 16 can be performed. And, even if there is no suction port directly communicating with the front space 75, the front space 75 passes through the gap 89 existing between the first large diameter portion 201 and the inner peripheral portion 11A of the sleeve 11. 4 It leads to the suction port (17). Therefore, the front space 75 can be sucked through the gap 89 and the fourth suction port 17.

Therefore, in the example shown in FIG. 11(e), the selection valve 33 corresponding to the fourth suction port 17 is not closed. It is possible to suction the inside of the suction recess 120 through the third suction port 16 while suctioning the front space 75 through the fourth suction port 17 and the gap 89.

After that, when the plunger 12 moves forward, the fourth suction port 17 communicates with both the gap 89 and the inside of the suction recess 120, so that the front space passes through the fourth suction port 17. Vacuum suction can be performed on the inside of 75 and the suction recess 120.

Sleeve vacuum termination steps:

In addition, as shown in FIG. 11(f), the plunger 12 advances to a position where the front end of the second large-diameter portion 202 exceeds the fourth suction port 17 forward, thereby creating a suction concave. If the part 120 is closed by the inner wall of the sleeve 11, the sleeve vacuum is terminated (sleeve vacuum termination step). At this time, the selection valve 33 corresponding to the fourth suction port 17 is closed. This selection valve 33 is preferably closed in a state where the fourth suction port 17 is closed by the second large diameter portion 202 and is not in communication with the external space 88.

In addition, even if the inside of the suction recess 120 is suctioned through the gap 90 between the second large diameter portion 202 and the sleeve 11 and the suction port 17 communicating with the gap 90, good night. In that way, the front space 75 can also be suctioned via the inside of the suction recess 120, and the sleeve vacuum can be extended and performed.

However, before the suction port 17 communicates with the space 88 around the rod 19 due to the advancement of the plunger 12, the selection valve 33 corresponding to the suction port 17 is closed, and the sleeve It is desirable to terminate the vacuum.

As can be understood from FIGS. 11(a) to 11(f) and the above explanation, regarding each suction port 14 to 17, at the beginning of the sleeve vacuum, any suction port 14 to 17 is used. The population (e.g., first suction port 14) communicates with the front space 75, and until it is closed by the first large diameter portion 201 of the advanced plunger 12, the front space 75 is connected to the front space 75. It is connected to space (75). Next, the suction port communicates with the inside of the suction recess 120 by advancing the plunger 12. The suction port communicates with the inside of the suction recess 120 until it is closed by the second large diameter portion 202 of the advanced plunger 12. After any suction port is closed by the second large diameter portion 202, the suction port does not communicate with either the front space 75 or the inside of the suction recess 120, and therefore cannot be used for sleeve vacuum. , the corresponding selection valve 33 is closed.

Over the course of the sleeve vacuum from the start of the sleeve vacuum shown in FIG. 11(b) until just before the plunger 12 reaches the position shown in FIG. 11(e), the suction ports 14 to 17 ) Overall, at least one suction port is always communicating with the front space 75, and at least one suction port is communicating with the inside of the suction recess 120.

By doing so, vacuum suction from the inside of the suction recess 120 can be continued until vacuum suction from the front space 75 through the frontmost suction port 17 is completed.

Therefore, the sleeve vacuum is initiated by suction from the inside of the suction recess 120 in addition to the front space 75 and the sealing action by the sliding seal 70 and seal member 79 described above. After that, suction within the sleeve 11 can be stably continued while preventing fluctuation of the molten metal 18 due to the inflow of external air until the end of the injection-filling process. Therefore, the mixing of gas into the molten metal 18 can be suppressed and the quality of the cast product can be improved.

Additionally, as shown in FIG. 11(e), if sleeve vacuum suction is attempted to continue even after the frontmost suction port 17 is closed by the first large diameter portion 201, the first large diameter portion 201 ) and the gap 89 between the sleeve 11 can be used to suction the front space 75. In that case, unlike the case where the sleeve vacuum is terminated in the state shown in FIG. 11(e), the frontmost suction port 17 is also used for suction inside the suction recess 120. do.

By doing this, after starting the sleeve vacuum, suction within the sleeve 11 can be continuously performed until the end of the injection-filling process.

As explained above, vacuum suction is simultaneously started with respect to the inside of the front space 75 and the suction recess 120, and suction is continuously performed from both sides from the start of the vacuum suction until the end, By terminating the vacuum suction at the same time, the inside of the suction recess 120, which is a space behind the front space 75 where the molten metal 18 is stored and whose pressure is equal to the front space 75, is vacuum-suctioned with the sleeve. Since it can be applied reliably at all times, it is desirable to suppress the inflow of external air.

However, even if the pressure inside the front space 75 and the suction recess 120 is affected by the interruption of vacuum suction, the outer peripheral portion 20C of the tip 20 of the plunger 12 and the sleeve 11 Since the space between the inner peripheral portions 11A of ) is sealed by the sliding seal 70 and the seal member 79, outside air can easily flow into the inside or front space 75 of the suction recess 120. It doesn't work.

In addition, if the interruption of vacuum suction is short enough not to affect the occurrence of blowholes due to agitation of the molten metal 18 or the blockage of the suction port due to molten metal residue, the sliding movement seal 70 or It is permitted regardless of whether the seal member 79 is present or not.

That is, as long as the inflow of external air is suppressed and sleeve vacuum suction is stably established, in a part of the period from the start of sleeve vacuum suction until it ends, the front space 75 and the suction recess 120 It is also allowed for suction on one or both sides of the inner side to be interrupted, or for the timing of the start or end of sleeve vacuum suction inside the front space 75 and the suction recess 120 to be different.

(Example of deformation and dimensional conditions due to suction of both the anterior space and the inside of the suction concave portion)

Next, with reference to Figures 12 (a) to (e), the number of suction ports 14 to 17 regarding vacuum suction from both the front space 75 and the inside of the suction recess 120. , a modified example of the injection device 1 will be described with respect to the dimensions of each part of the plunger tip 20 and the dimensions of the suction ports 14 to 17 of the sleeve 11 and the pouring port 13.

In the examples shown in all of Figures 12 (a) to (e), as in the case just before Figures 11 (b) to 11 (e), the suction ports 14 to 17 are selectively used. At least one communicates with the front space 75, and similarly, at least one of the suction ports 14 to 17 selectively communicates with the inside of the suction recess 120, so that the front space 75 and the suction recess 120 By suctioning both sides of the inside of 120, the inflow of external air into the front space 75 can be suppressed.

Furthermore, in the example shown in Figure 12(d), as described later, external air flows into the inside of the suction recess 120, so compared to other examples, external air flows into the front space 75. It lags behind the deterrent effect.

Let n be the number of suction ports 14 to 17. The number of suction ports 14 to 17 shown in Figures 12(a) to 12(e) is 4 (n=4).

As shown in Figures 12 (a) to 12 (c), when the inside of the front space 75 and the suction recess 120 is suctioned through another suction port, n may be 2 or more.

As shown in Fig. 12(e), when the inside of the front space 75 and the suction recess 120 are suctioned through the same suction port, n may be 1 or more.

In the examples shown in Figures 12 (a) to 12 (e), the dimensions and shapes of each suction port in the forward and backward direction D1 are the same.

In addition, when there are three or more suction ports (n≥3), these suction ports are arranged at equal intervals in the forward/backward direction D1.

The dimensions of each of the sleeve 11 and the plunger tip 20 are defined as follows.

· Dimensions regarding the sleeve

Ls1: Distance in the advance/retract direction (D1) from the pouring port (13) to the suction port (14) closest (rearmost) to the pouring port (13)

Ls2: Dimension of the advance and retreat direction D1 of each suction port 14 to 17

Ls3: Spacing between neighboring suction ports in the advance/retreat direction (D1)

· Dimensions regarding plunger tip:

Lp0: Dimension of the suction concave portion 120 in the advancing/retracting direction D1

Lp1: Dimension of the first large diameter portion 201 in the advance/retract direction (D1)

Lp2: Dimension of the second large diameter portion 202 in the advance/retract direction (D1)

In addition, like the suction recess 120 shown in (a) of FIG. 13, the dimensions of the advancing/retracting direction D1 at the inner end in the radial direction D2 and the outer end of the radial direction D2 are When the dimensions of the advancing and retreating direction D1 are different, Lp0 is assumed to be the dimension of the advancing and retreating direction D1 at the outer end. In this case, Lp1 and Lp2 are also assumed to be the dimensions of the advancing/retracting direction D1 at the outer end of the radial direction D2.

In the example shown in FIGS. 11(a) to 11(f) described above, the number n of the suction ports 14 to 17 is 4. In the example shown in Figures 11 (a) to 11 (f), the dimensions of each part of the sleeve 11 and the plunger tip 20 can be determined as follows, for example.

Ls1=50.5(mm)

Ls2=29(mm)

Ls3=41(mm)

Lp0=50(mm)

Lp1=65(㎜)

Lp2=60(㎜)

When attempting to vacuum suction the inside of the front space 75 and the suction recess 120 through the suction ports 14 to 17, as already explained, throughout the process of vacuum suction, the suction ports 14 to 17 ), at least one of them must communicate with the inside of the suction recess 120, and similarly, at least one of the suction ports 14 to 17 must communicate with the front space 75 (condition 1).

Here, the inside of the front space 75 and the suction concave portion 120 is vacuum-suctioned while the plunger 12 is continuously advanced during injection filling, as well as the state in which the forward movement of the plunger 12 is temporarily stopped. It is also assumed that the inside of the front space 75 and the suction recess 120 is vacuum-suctioned.

The maximum value (upper limit) of Lp1 that satisfies Condition 1 above is expressed by the following equation (1), based on the example shown in (a) of FIG. 12.

Lp1＜n×Ls2+(n-1)×Ls3 (1)

In order to form the suction concave portion 120 in the tip 20, it is sufficient as long as the first large-diameter portion 201 is present in the tip 20, even if the length of the first large-diameter portion 201 is extremely short. . Therefore, the minimum value (lower limit) of Lp1 is expressed by the following equation (2).

0＜Lp1 (2)

Equations (1) and (2) are summarized below.

0＜Lp1＜n×Ls2+(n-1)×Ls3

On the premise that the suction recess 120 exists, the above equation (1) regarding Lp1 is obtained from both the front space 75 and the inside of the suction recess 120, the suction ports 14 to 17 ) is an essential requirement to realize direct suction (condition 1).

Hereinafter, as additional requirements for realizing condition 1, equations for Lp0 and Lp2 are shown.

First, Lp0, which is the dimension of the suction recess 120 in the advancing/retracting direction D1, will be explained.

In order to vacuum suction from both the front space 75 and the inside of the suction recess 120 through the suction ports 14 to 17, even if Lp0 is maximized, the vacuum as shown in FIG. 12(b) Based on the example, when the pouring port 13 is closed by the front end of the second large diameter portion 202, the suction port 17 closest to the cavity 23 and the front space 75 need to be in communication. there is.

Then, by comparing the dimensions of each part of the plunger tip 20 and the dimensions of each part of the sleeve 11, the following equation (3) is derived.

Lp0+Lp1<Ls1+n×Ls2+(n-1)×Ls3 (3)

From equation (3), the maximum value (upper limit) of Lp0 suitable for condition 1 is expressed by the following equation (4). Additionally, when Lp1 is minimum (infinitely close to 0), Lp0 becomes maximum.

Lp0＜Ls1+n×Ls2+(n-1)×Ls3-Lp1 (4)

Here, equation (4) assumes that the pouring port 13 is closed by the front end of the second large diameter portion 202. If we take into account that the pouring port 13 is closed by a member different from the plunger 12, for example, a member inserted from the rear into the sleeve 11, Lp0 does not fall within the range of equation (4). No.

After starting the vacuum suction inside the front space 75 and the suction recess 120 at the position of the plunger 12 shown in FIG. 12(b), with the plunger 12 stopped, the front It is possible to perform vacuum suction with the space 75 and the inside of the suction recess 120. Thereafter, the plunger 12 is advanced to perform vacuum suction inside the front space 75 and the suction recess 120 until the suction port 17 is closed by the first large diameter portion 201. You can continue to run it.

The minimum value of Lp0 can be set based on Condition 2 below.

While the plunger 12 moves forward, both the front space 75 and the inside of the suction recess 120 are suctioned through the suction hole (condition 2).

The minimum value (lower limit) of Lp0 that satisfies Condition 2 above is expressed by the following equation (5) so that it can be understood from the example shown in Figure 12(c).

Lp0＞Ls3 (5)

That is, the size Lp0 of the recessed portion 120 for suction is larger than the size Ls3 of the gap between the adjacent suction ports 14 to 17. For this reason, for example, as shown in Figure 12 (c), the axial rear side of the suction recess 120 communicates with the suction port 14, and the suction recess ( The axial front side of 120) communicates with the suction port 15. In that case, without depending on the axial position of the plunger tip 20 with respect to the section in which the suction ports 14 to 17 of the sleeve 11 are parallel, there must be at least one suction recess 120 on the inside. The suction port becomes open. Therefore, it satisfies condition 2.

If equation (5) holds in addition to the above equation (1), as already explained with reference to Figures 11 (a) to (f), when three or more suction ports exist (n>2 ), as the plunger 12 advances, vacuum suction inside the suction recess 120 through two suction ports (FIG. 11(c)), and suction recess through one suction port ( Vacuum suction (FIG. 11(d)) inside 120) is alternately repeated, and vacuum suction of the front space 75 through at least one suction port is continuously performed. At this time, both the front space 75 and the inside of the suction recess 120 are continuously suctioned through the suction hole.

In addition, in the case of n = 2 as in the second embodiment described below, both the front space 75 and the inside of the suction recess 120 are continuously maintained regardless of the requirements shown in equation (5). Aspiration is possible.

Next, Lp2, which is the dimension of the second large diameter portion 202 in the advancing/retracting direction D1, can be set based on Condition 3 below.

External air is suppressed from flowing into the inside of the suction recess 120 from behind the second large diameter portion 202 via the suction ports 14 to 17 closed by the second large diameter portion 202 (conditions 3). This will be explained with reference to Figures 12(d) and 12(e).

As shown by the arrow in FIG. 12(d), external air from behind the second large diameter portion 202 flows into the inside of the suction concave portion 120 through the suction port 14. Condition 3 is not satisfied. At this time, it is difficult to reduce the pressure inside the suction recess 120 to the same degree as that in the front space 75.

On the other hand, in Figure 12(e), the suction port 14 is closed by the second large-diameter portion 202 behind the suction recess 120, so the space behind the second large-diameter portion 202 88 and the inside of the suction recess 120 are not in communication via the suction port 14. Therefore, since the outside air is suppressed from flowing into the inside of the suction concave portion 120 from behind the second large diameter portion 202, the above condition 3 is satisfied.

As can be understood from the example shown in (e) of FIG. 12, the minimum value (lower limit) of Lp2 suitable for condition 3 is expressed by the following equation (6).

Lp2≥Ls2 (6)

Equation (6) corresponds to the practically necessary requirements to suppress the inflow of external air into the front space 75 and reliably perform sleeve vacuum suction.

[Second Embodiment]

Next, with reference to FIGS. 13 and 14, the injection device 6 of the die casting machine according to the second embodiment of the present invention will be described.

Hereinafter, description will be given focusing on matters that are different from the first embodiment. Configurations similar to those in the first embodiment are given the same symbols.

The injection device 6 of the second embodiment includes a sleeve 11 formed with two suction ports 14 and 15 spaced apart in the forward and backward direction D1 of the plunger 12, and two sliding seals 81. , 82) and a plunger 12 provided with one seal member 79. The number n of suction ports is 2 (n=2).

The sliding seals 81 and 82 and the seal member 79 are provided in the second large diameter portion 202 of the plunger tip 20. The configuration of the sliding seals 81 and 82 and the seal member 79 is the same as that already described with reference to Figures 13 (a) and (b).

The requirements regarding the dimensions of each part of the plunger tip 20 and the sleeve 11, explained with reference to (a) to (e) of FIG. 12, are as shown in FIG. 13 and This also holds true for the injection device 6 shown in FIG. 14.

Hereinafter, with reference to FIGS. 14(a) to 14(c), the process of sleeve vacuum suction in the second embodiment will be described.

As shown in Figure 14 (a), the front end of the second large diameter portion 202 passes through the pouring port 13 and is blocked, and the inside of the suction concave portion 120 and the suction port 14 are closed. When communicating, it is desirable to initiate sleeve vacuum suction.

At this time, both the front space 75 and the inside of the suction recess 120 are partitioned within the sleeve 11 by the tip 20 without communicating with the pouring port 13. Additionally, the second suction port 15 communicates with the front space 75, and the first suction port 14 communicates with the inside of the recess 120 for suction.

Therefore, as shown by the solid arrow in FIG. 14(a), suction is possible from the front space 75 by the vacuum suction system 2 (FIG. 2) through the second suction port 15, As shown by the broken arrow in FIG. 14(a), suction is possible from the inside of the suction recess 120 by the vacuum suction system 2 through the first suction port 14.

Thereafter, until the second suction port 15 is closed by the first large diameter portion 201 of the tip 20 of the plunger 12 advanced, as shown in FIG. 14(b). Throughout, vacuum suction can be continued from both the front space 75 and the inside of the suction recess 120.

As shown in Fig. 14(b), even after the second suction port 15 is closed by the first large-diameter portion 201, the gap 89 between the first large-diameter portion 201 and the sleeve 11 ) (FIG. 14(c)) while suctioning the front space 75 from the second suction port 15, the inside of the suction recess 120 is also sucked through the gap 90 to the first suction port 14 ) can be aspirated from. Even after suction from the front space 75 is terminated, the inflow of external air into the front space 75 can be continuously suppressed by suction from the inside of the suction recess 120.

In the case where n > 2, as in the example shown in FIG. 11 or FIG. 12 described above, the states shown in, for example, (c) and (d) of FIG. 11 are alternately repeated as the plunger 12 advances. That is, the suction port communicating with the inside of the suction recess 120 may be sequentially switched while the front space 75 and the inside of the suction recess 120 may be continuously suctioned. However, in the second embodiment where n=2, this is not necessary.

In the second embodiment, at least until just before the second suction port 15 is closed, as shown by the broken arrow in FIG. 14(b), it directly communicates with the inside of the suction recess 120. It is sufficient if suction can be continued from the inside of the suction recess 120 through the first suction port 14.

As shown in FIG. 14(b), if the second suction port 15 is closed by the first large diameter portion 201, at least the second suction port 15 directly communicates with the front space 75. ) is terminated. In the state shown in Figure 14 (b) or (c), the inside of the suction recess 120 does not necessarily need to be in communication with the second suction recess 15. In the case of n = 2 as in the second embodiment, the front space 75 is suctioned regardless of the requirement expressed in the above equation (5) regarding the lower limit of the size Lp0 of the suction recess 120. The inside of the suction concave portion 120 can be suctioned directly from the suction port 14 throughout this period. Therefore, in the second embodiment, unlike equation (5), Lp0≤Ls3.

If Lp0≤Ls3, although not shown, the second suction port 15 is closed by the first large-diameter portion 201, and the first suction port 14 is closed by the second large-diameter portion 202. In this case, there may be cases where vacuum suction inside the suction recess 120 is stopped due to the absence of a suction port communicating with the inside of the suction recess 120. At this time, even if the molten metal 18 is shaken, since n = 2, there are no open suction ports other than the suction ports 14 and 15, so at least the suction is caused by the scattering of the molten metal 18. There is no need to worry about the population being blocked.

In the second embodiment, the inside of the suction recess 120 is communicated with through the second suction port 15 communicating with the front space 75 until immediately before the end of direct vacuum suction of the front space 75. In order to continue direct vacuum suction inside the suction recess 120 through the first suction port 14, the requirement shown in equation (1) regarding the upper limit of Lp1 is essential as described above. . The upper limit of Lp0 is preferably in accordance with the requirements shown in the above-mentioned equation (4), and the lower limit of Lp2 is preferably in accordance with the requirements shown in the above-mentioned equation (6).

[Injection device equipped with sealant supply device]

Next, with reference to FIG. 15, an injection device 6A according to an embodiment of the present invention will be described.

The injection device 6A shown in FIG. 15 is provided with a sealant supply device 60 to sandwich the sealant 61 between the inner peripheral portion of the sleeve 11 and the outer peripheral portion of the plunger tip 20. .

The injection device 6A is preferably provided with the above-described sliding seal 70 and seal member 79 (FIG. 4).

The sealant supply device 60 is configured to supply the sealant 61 to each of the outer peripheral portion of the first large-diameter portion 201 and the outer peripheral portion of the second large-diameter portion 202 of the plunger tip 20. .

As the sealant 61, for example, a lubricant used for lubricating the plunger tip 20 can be used. Generally, the higher the viscosity of the sealing agent 61, the better the sealing properties. However, if the viscosity is too high, the fluidity decreases, making it difficult to sufficiently spread the sealing agent 61 into required areas. Therefore, it is desirable to use a sealing agent 61 with an appropriate viscosity in consideration of sealing properties and fluidity. As the sealant supply device 60, it is possible to use a known plunger lubricant supply device.

The sealant supply device 60 includes a container 62 storing the sealant 61, a first pipe 631 and a second pipe 632 respectively connected to the container 62, and the sealant 61. It is equipped with a valve (not shown) to supply in a timely manner. It is preferable that the valve of the sealant supply device 60 is automatically opened/closed or the degree of opening is adjusted by the control device 3 (FIG. 1) or the like. If these valves are individually provided in the first pipe 631 and the second pipe 632, the sealant 61 can be individually supplied to the first large diameter portion 201 and the second large diameter portion 202. . It is also permitted to supply the sealant 61 to only one of the first large diameter portion 201 and the second large diameter portion 202.

The form of the first pipe 631 and the second pipe 632 is not limited to the example shown in FIG. 15, and can be formed from one pipe connected to the container 62 to the first pipe 631 and the second pipe ( 632) may be branched.

As shown by the solid line in FIG. 15, when the plunger 12 is in the retracted position, the front end side of the plunger tip 20 is inserted into the sleeve 11. At this time, the sealant 61 is supplied to the outer periphery of the first large-diameter portion 201 located within the sleeve 11 through the first pipe 631, and the sealant 61 is supplied to the second large-diameter portion located outside the sleeve 11. The sealant 61 can be supplied to the outer periphery of 202 through the second pipe 632.

As shown by the broken line in FIG. 15, when the plunger tip 20 advances, the sealant 61 is spread and filled in the gap 89 between the outer periphery of the first large diameter portion 201 and the inner periphery of the sleeve 11. do. Therefore, the space between the first large diameter portion 201 and the sleeve 11 is sealed with the sealant 61.

Similarly, as the plunger tip 20 advances, the sealant 61 is spread and filled in the gap 90 between the outer peripheral portion of the second large diameter portion 202 and the inner peripheral portion of the sleeve 11. Therefore, the space between the second large diameter portion 202 and the sleeve 11 is sealed with the sealant 61.

Also in this embodiment, both the front space 75 and the inside of the suction recess 120 are vacuum-suctioned. At that time, the sealant 61 present in the gap 90 suppresses external air from flowing into the negative pressure suction recess 120 through the space 88, thereby forming the suction recess 120. While keeping the pressure inside the suction low, the sealant 61 present in the gap 89 ensures that even if there is a pressure difference between the inside of the suction recess 120 and the front space 75, the suction is maintained. It is possible to suppress external air from flowing into the front space 75 via the inside of the concave portion 120.

In the example shown in Fig. 15, the distal end of the first pipe 631 is inserted into the seal pipe hole 11D that penetrates the wall behind the pouring port 13 of the sleeve 11 in the thickness direction. Since the outlet 631A of the first pipe 631 opened inside the seal pipe hole 11D is close to the outer periphery of the first large diameter portion 201 of the plunger tip 20 in the retracted position, The sealant 61 is reliably supplied to the outer peripheral portion of the first large diameter portion 201 from the outlet 631A.

The second pipe 632 has an outlet 632A near the outer periphery of the second large diameter portion 202 exposed to the outside of the sleeve 11. The sealant 61 is reliably supplied to the outer peripheral portion of the second large diameter portion 202 also from this outlet 632A.

As in the example shown in FIG. 15, when two pipes 631 and 632 are used, a sealant ( 61) can be supplied reliably, and the sealant 61 can be supplied simultaneously or in parallel to the first and second large diameter parts 201 and 202 through the two pipes 631 and 632. , the phase of sealing supply can be terminated quickly.

The sealant 61 is sandwiched between the inner peripheral part of the sleeve 11 and the outer peripheral part of the tip 20, the sealing agent supply device 60 is appropriately configured so as to seal the gap between them, and the plunger is provided. There is no limitation when (12) is in the retracted position, and the sealant (61) can be supplied to the outer peripheral part of the tip (20) at an appropriate timing. Supply of the sealant 61 to the first large-diameter portion 201 and supply of the sealant 61 to the second large-diameter portion 202 may be performed at the same timing or may be performed at different timings.

When the plunger 12 is in the retracted position, for example, about half of the axial direction of the first large diameter portion 201 is exposed to the outside of the sleeve 11, the first pipe 631 The distal end may be located outside the sleeve 11 like the second pipe 632.

When the sealant 61 is supplied to the outer peripheral part of the second large-diameter part 202 when the second large-diameter part 202 is inserted into the sleeve 11, like the first pipe 631, the second pipe The distal end of 632 can be placed inside the hole formed in the sleeve 11.

The sealant supply device 60 does not necessarily have two pipes 631 and 632. Even if the sealant supply device 60 has only one pipe 631 connected to the container 62, the second large diameter portion 202 is supplied through the pipe 631 due to the advancement of the tip 20. The sealant 61 can also be supplied to the outer periphery of .

[Third Embodiment]

Next, with reference to FIGS. 16 to 19, a third embodiment of the present invention and its modifications will be described. The third embodiment, modifications of the third embodiment, and the fourth embodiment described below relate to measures against blockage of the suction path 51. These blockage measures can be applied to the injection devices 1 and 6 of the first and second embodiments and the die casting machine 100 equipped with the injection device 1 or 6.

The configuration disclosed in the third embodiment, the modification of the third embodiment, and the fourth embodiment can also be applied to an injection device having a sleeve and a plunger including a tip in which the suction recess 120 is not defined. You can.

The third embodiment shows the configuration of a die casting machine provided with a suction path 51 (FIG. 2) for vacuum suctioning the space formed by communicating from the inner space of the sleeve 11 to the cavity 23. . Here, the suction path 51 that suctions the internal space of the sleeve 11 from each of the suction ports 14 to 17, which are a plurality of holes drilled in the sleeve 11, will be explained.

However, the suction path 51 is connected to another hole or opening provided in the sleeve 11, as long as it can vacuum suction the space formed by communicating from the inner space of the sleeve 11 to the cavity 23. Alternatively, it may be connected to a passage provided in the plunger 12, for example, a passage extending axially from the tip 20 toward the rear end of the plunger 12. As described above, the third embodiment, a modification of the third embodiment, and the fourth embodiment are also applicable to an injection device provided with a tip 20 in which the suction concave portion 120 is not defined. In this case, the suction path 51 may be connected to only one suction port formed in the sleeve.

In addition, the suction path 51 is not limited to being connected to the hole or opening of the sleeve 11 or plunger 12 of the injection device, and is connected to the connector 28 (FIG. 2) provided at one or more places in the mold. It may be something that is connected.

The above description regarding the suction path 51 also applies to the fifth embodiment and modifications of the fifth embodiment.

The suction path for suctioning the inside of the cavity 23 will be described later with reference to FIG. 27.

FIG. 16 shows a collection structure 130 provided on the suction path 51 through which gas is sucked from the inside of the sleeve 11 through the suction port 14. The collection structure 130 separates molten metal residues (S), etc. mixed in the gas sucked toward the vacuum tank 36 through the suction path 51 constituting the vacuum suction system 2 (FIG. 2) described above from the gas. and capture it.

By collecting the molten metal waste S, etc. by the collection structure 130, a decrease in suction efficiency or blockage of the suction path 51 due to retention of the molten metal waste S, etc. in the suction path 51 is prevented.

When the vacuum suction system 2 is provided with a vacuum filter 31 (FIG. 2), the collection structure 130 is located upstream of the vacuum filter 31 in the flow of gas sucked through the suction path 51. It is being prepared on the side. In that case, the collection structure 130 prevents the vacuum filter 31 from clogging.

Above all, by using the collection structure 130 of this embodiment, the vacuum filter 31 can also be omitted from the vacuum suction system 2.

In addition to the suction path 51 corresponding to the suction port 14, the collection structure 130 can be provided in any of the suction paths 51 corresponding to each of the suction ports 15 to 17. In addition, among the suction paths 51 corresponding to each of the suction ports 14 to 17, the collection structure 130 may be provided only on at least one suction path 51 that is particularly likely to be blocked by molten metal residue S or the like. there is.

The collection structure 130 includes a first section 131 that is part of the suction path 51, a second section 132 that is part of the suction path 51, a section connection portion 133, and a collection portion 134. I'm doing it.

The collection unit 134 is connected to the suction path 51 and receives molten metal residue S, which is liquid droplets or solidified pieces of molten metal. In addition to the molten metal residue S, the gas sucked from the inside of the sleeve 11 may contain foreign matter such as dust or an excess of oil-based or water-soluble lubricant used to lubricate the plunger tip 20. In addition to the molten metal residue S, the gas sucked from the cavity 23 may also contain foreign matter such as dust or an excess of an oil-based or water-soluble mold release agent. The collection unit 134 receives and stores molten metal residues (S), foreign substances, lubricants, or mold release agents, etc., which have a large weight and density relative to the gas. In this specification, molten metal residues (S), foreign substances, lubricants, or mold release agents are referred to as “molten metal residues, etc.”

In the example shown in FIG. 16, the collection part 134 is formed integrally with the section connecting part 133 and has a cylindrical shape, but the present invention is not limited thereto. The collection part 134 and the section connection part 133 are separate bodies and may be joined. In addition, the collection part 134 may have an appropriate shape as long as it can collect the molten metal residue (S) separated from the gas and store it inside, for example, it can be formed in a box shape showing a rectangular cross section. You can. The section connecting portion 133 is not limited to a cylindrical shape, and may have any appropriate shape.

Considering the assumed amount of molten metal residues (S) mixed into the gas and the cleaning frequency of the collection unit 134, an appropriate distance between the stored molten metal residues (S) and the inlet 132A of the second section 132. In order to secure, an appropriate volume can be given to the collection unit 134.

The first section 131 is a part of the pipe extending from the upstream side of the collection unit 134, that is, the suction port 14 side (or the suction port 15 to 17 side), and flows downward toward the collection unit 134. It is extended to

In the piping of the suction path 51, the area 51A between the suction port 14 (or 15 to 17) located in the upper part of the sleeve 11 and the collection portion 134 is typically a suction port ( After rising upward from 14) (or 15 to 17), it curves downward after passing through a horizontal section. That is, the area 51A is curved upward in a convex state. The first section 131 corresponds to a section extending downward toward the collection unit 134 in the area 51A.

Area 51A can be constructed by assembling a plurality of pipes. In order to avoid molten metal residues S and the like remaining on the inner wall of the pipe, it is preferable to use a pipe with a smooth inner wall in the area 51A.

The piping of the suction path 51 is appropriately treated according to the space allowed for installation of the piping, the position of supports supporting the piping, etc., or to avoid interference between the piping. Therefore, the area 51A may be curved into a more complicated shape than the inverted U shape shown.

The section connection portion 133 surrounds the first section 131 from the outside, and reaches the collection section 134 beyond the outlet 131A at the lower end of the first section 131. It is sufficient for the section connection portion 133 to surround at least the vicinity of the lower end of the first section 131.

Considering the resistance of the airflow flowing out from the first section 131 and passing between the side wall 131B of the first section 131 and the inner wall 133A of the section connection portion 133, the first section 131 and each of the section connection parts 133 can be given an appropriate diameter.

The axis of the section connection part 133 and the axis of the first section 131 disposed inside the section connection part 133 do not necessarily need to coincide. For example, the first section 131 may be eccentric to the left in FIG. 16 with respect to the section connecting portion 133. In this case, the inner wall is located on the right side of the section connecting portion 133 to which the second section 132 is connected rather than between the inner wall 133A and the side wall 131B on the left side of the section connecting portion 133 shown in FIG. 16. The space between (133A) and the side wall (131B) is wide.

The second section 132 is connected to the section connection part 133 at a position where the first section 131 is surrounded by the section connection part 133. In the example shown in FIG. 16, the second section 132 is formed integrally with the section connecting portion 133 and the collecting portion 134, but the present invention is not limited to this.

The inlet 132A of the second section 132 is opened in the inner peripheral portion of the section connection portion 133. The inlet 132A faces the side wall 131B of the first section 131.

The first section 131 and the second section 132 communicate through the inside of the section connection portion 133, and form a flow path 130F for the gas to be sucked. The first section 131 extends along the vertical direction, and the second section 132 is opened in the horizontal direction in the inner wall 133A of the section connection portion 133. The flow of gas flowing out downward from the first section 131 is diverted inside the section connecting portion 133 and flows into the second section 132 connected to the inner wall 133A of the section connecting portion 133. Therefore, a curved flow path 130F is formed across the first section 131, the section connection portion 133, and the second section 132. The flow of gas flowing through the flow path 130F is schematically shown by arrows in FIG. 16.

Additionally, the second section 132 may be disposed at a position indicated by the two-dashed chain line so that the gas flowing out of the first section 131 is diverted toward the left side of FIG. 16 . In this case as well, the same effect as that achieved by the collection structure 130 of this embodiment can be obtained.

In addition, the first section 131 is inclined with respect to the vertical direction, or, in the inner wall 133A of the section connection portion 133, the inlet 132A of the second section 132 is opened in a direction inclined with respect to the horizontal direction. It is also permitted to be The second section 132 may extend obliquely upward or obliquely downward from the inner wall 133A.

The second section 132 shown in FIG. 16 extends in the horizontal direction, but is not necessarily limited to this, and the second section 132 may extend in any direction from the connection point with the section connection portion 133. good night.

The height H1 of the outlet 131A of the first section 131 is the height of the inlet 132A (opening) of the second section 132, which is the connection between the section connection portion 133 and the second section 132 ( H2) or less is preferable (H1≤H2, L≥0). H1, H2 are the heights from the same reference position.

Here, the height H2 of the inlet 132A means the height at the lower end of the inlet 132A. That is, the first section 131 preferably extends to the lower end of the inlet 132A of the second section 132, or extends downward from the lower end of the inlet 132A.

The flow path 130F flows downward from the outlet 131A of the first section 131, then flows upward from the outlet 131A inside the section connection portion 133, and is located at the axis of the first section 131. It flows radially outward and flows into the inlet 132A of the second section 132.

Based on the above-described specific example shown in FIG. 16, the requirements of the collection structure 130 are simply shown.

The collection structure 130 is,

(1) a first section 131 that communicates with the suction port 14 (or 15 to 17) and extends downward toward the collection portion 134;

(2) a box for molten metal waste (section connection part 133 and collection part 134) connected to the first section 131;

(3) A second section 132 formed to communicate with the inner space of the box for molten metal waste is provided.

In addition, in the collection structure 130, the height H1 of the outlet 131A of the first section 131 is equal to that of the connection point (inlet 132A) between the section connection portion 133 and the second section 132. It is preferable that it is less than the height (H2). Specifically, the distance L corresponding to the difference between the height H1 and the height H2 satisfies the relationship in equation (7) below.

L≥0 (7)

If L≥0, when the opening of the inlet 132A of the second section 132 is projected onto the side wall 131B of the first section 131, the upper end of the opening of the inlet 132A within the projection range R1 There are both sides (12 o'clock position) and bottom (6 o'clock position).

The action of the trapping structure 130 will be explained. By vacuum suction, the molten metal residue S, etc., sucked into the suction path 51 together with the gas from within the sleeve 11 through the suction port 14 (or 15 to 17) flows through the first section 131. Head towards the collection unit (134).

By vacuum suction, when the gas flows out of the first section 131, it is deflected inside the section connection portion 133 and is drawn toward the second section 132, but the molten metal residue (S) has a large inertial force compared to the gas. The back is separated from the body by moving almost straight downward along the extension direction of the first section 131 from the lower end of the first section 131. Molten metal residues (S) separated from the flow of gas flowing into the second section 132 are captured by the collection unit 134. Molten metal residues S and the like fall through the internal space of the collection unit 134 and are stored at the bottom of the collection unit 134 .

In addition to the inertial force, centrifugal force also causes molten metal residues (S) mixed into the gas to be separated from the gas. That is, based on the difference in density between the gas and the molten metal residue (S), due to the centrifugal force acting on the gas flowing out from the first section 131 and redirecting toward the second section 132, the gas and the molten metal residue (S) ), etc. are separated.

Here, the first section 131 and the second section 132 are not in direct communication, but are in communication through a section connection portion 133 surrounding the first section 131. In addition, at the position where the first section 131 is surrounded by the section connecting portion 133, the second section 132 is connected to the section connecting portion 133. Therefore, the side wall 131B of the first section 131 exists within the projection range R1 ((a) of FIG. 17) of the inlet 132A of the second section 132 with respect to the first section 131. I'm doing it.

The above configuration is shown enlarged in Figure 17(a).

According to the above configuration, a path for vacuum suction is secured from the first section 131 to the second section 132, and from the first section 131 to the second section 132 by the side wall 131B. It is possible to prevent gas from entering directly.

Here, even when gas flows directly from the first section 131 to the second section 132, as shown in another example (b) of FIG. 17, the molten metal residue is separated from the gas by inertial force and centrifugal force. It has been confirmed through testing that (S) and the like are generally captured.

In addition, the second section 132 is disposed at the position indicated by the two-dot chain line, and even if the gas flowing out of the first section 131 is deflected toward the left side of FIG. 17(b), the gas flowing out from the first section 131 is deflected toward the right side. It showed the same collection efficiency as in the case.

In this embodiment, as shown in FIG. 17(a), the second section 132 is connected to the section connection portion 133 surrounding the first section 131. According to this embodiment, compared to the case where gas flows directly from the first section 131 to the second section 132, the collection efficiency of molten metal residues (S), etc. is high, and the molten metal residues (S), etc. are collected. It has also been confirmed through testing that the effect of regulating the inflow into the second section 132 is high.

With reference to FIG. 17(a) and another example, FIG. 17(b), the operation of the collection structure 130 of the present embodiment will be described. In the example shown in (b) of FIG. 17, the outlet 131A of the first section 131 is located above the inlet 132A of the second section 132. The side wall 131B of the first section 131 does not exist within the projection area of the inlet 132A.

In this embodiment (FIG. 17(a)), since the first section 131 is long compared to the example shown in FIG. 17(b), the projection range of the inlet 132A of the second section 132 ( Since the side wall 131B of the first section 131 exists within R1), the gas flowing out of the first section 131 enters the outer periphery of the first section 131 and then enters the second section 132. comes in.

Meanwhile, in the example shown in (b) of FIG. 17, the gas flowing out of the first section 131 directly flows into the second section 132. This is the same as the case where the first section 131 does not exist inside the section connecting portion 133.

According to this embodiment, the outlet (131A) of the first section (131) surrounded by the section connection portion (133) and the inlet (131A) of the second section (132) opened in the inner wall (133A) of the section connection portion (133) Based on the arrangement of 132A), as shown in (a) of FIG. 17, the airflow is bent at multiple locations from the outlet 131A to the inlet 132A. Specifically, the airflow is bent from the outlet 131A to the outer periphery of the first section 131, and a portion of it is sprayed onto the side wall 131B of the first section 131, toward the second section 132. converted. In this process, the airflow collides near the lower end of the first section 131 or the periphery of the inlet 132A of the second section 132.

By doing so, the effect of separating the molten metal residue (S), etc. from the gas due to inertial force and centrifugal force at each of the bent locations is obtained, and the inlet ( The effect of separating molten metal residues (S), etc., by collision of air currents with the peripheral part of 132A) can also be obtained.

In this embodiment, since the side wall 131B of the first section 131 exists between the outlet 131A of the first section 131 and the inlet 132A of the second section 132, the outlet 131A ), the gas flowing out from the side wall 131B enters the outer periphery of the side wall 131B until it reaches the inlet 132A, and the gas from which the molten metal residues S is sufficiently separated flows into the second section 132. Therefore, the molten metal residues (S), etc. are prevented from flowing out toward the vacuum filter 31 or the selection valve 33 through the second section 132, and the molten metal residues (S), etc., are prevented by the collection unit 134. Capture can be promoted.

As described above, according to the present embodiment, in the example shown in (b) of FIG. 17, the molten metal residue S, etc., is more fully separated from the sucked gas and collected in the collection unit 134. Since outflow of molten metal residues S into the second section 132 can be prevented, a decrease in suction efficiency or blockage of the suction path 51 can be prevented in advance.

Therefore, even if a piping with a smooth inner wall was used in the first section 131 to prevent retention of molten metal residues S, etc., the second section 132 and, more importantly, the vacuum tank 36 side. For piping, it is possible to use corrugated box-shaped piping (bellows pipe) with a high degree of installation freedom.

Additionally, the use of corrugated box-shaped piping to area 51A is also permitted.

The collection unit 134 is regularly cleaned to remove molten metal residues (S) accumulated therein. As a result, the amount of molten metal residue S sucked into the second section 132 can be reduced, so when the vacuum filter 31 is used, the cleaning frequency of the vacuum filter 31 can be reduced. , the decrease in suction efficiency of the suction path 51 can be suppressed and stable operation can be performed.

The smaller the volume of the collection section 134, the smaller the amount of suction air, which improves the efficiency of vacuum suction and is advantageous in terms of vacuum degree. However, if the volume of the collection section 134 is too small, the cleaning frequency of the collection section 134 increases, so the volume of the collection section 134 may be appropriately determined by considering the degree of vacuum and the cleaning frequency.

As shown in Figures 16 and 17(a), the height H1 of the outlet 131A of the first section 131 is less than or equal to the height H2 of the inlet 132A of the second section 132. Preferable (H1≤H2). In that case, the gas flowing out from the first section 131 enters the outer periphery of the side wall 131B as a whole, collides with the lower end of the first section 131 or the peripheral portion of the inlet 132A, and enters the second section ( 132). Therefore, the molten metal residues (S) etc. mixed in the gas are separated and collected from the gas during the period from the outlet 131A until it reaches the inlet 132A, and the second section 132 By suppressing the inflow of molten metal waste S, etc. into the suction path 51, the effect of preventing a decrease in suction efficiency or blockage is high.

Here, the larger the H2-H1 (distance L), the more effectively the inflow of molten metal residues S into the second section 132 can be prevented. The difference between the heights H1 and H2 is the efficiency of separation and collection from gases such as molten metal residue S, and the pressure exerted on the airflow near the lower end of the first section 131 or the peripheral part of the inlet 132A. It can be determined appropriately considering the loss.

As an example, the distance (L) can be set to 5 mm. As a result of performing a test of vacuum suction within the sleeve 11 by applying a distance (L) = 5 mm in an actual die casting machine, molten metal residues (S), etc. were collected in the collection unit 134, Since little flows into the second section 132, the vacuum filter 31 can be omitted from the vacuum suction system 2. According to the above test, there was no adhesion of molten metal residues S to the filter of the Y-type strainer installed upstream of the selection valve 33.

Even if the distance L is 5 mm or less or the height H1 is higher than the height H2, the side wall 131B of the first section 131 is within the projection range R1 of the inlet 132A even if it is only slightly. If present, at least a portion of the gas flowing out from the first section 131 is introduced into the outer periphery of the first section 131 from the inside of the section connection portion 133 surrounding the first section 131 and into the second section. It flows into (132). By sufficiently separating and collecting the molten metal waste S from the flow, the outflow of the molten metal waste S etc. into the second section 132 is prevented and the suction efficiency of the suction path 51 is reduced or blocked. can be prevented.

Near the lower end of the first section 131, a plurality of slits can be formed by using mesh, punching metal, etc. The opening of the slit may be set to a size that does not allow molten metal residues (S) to pass through. By forming a slit, it functions as a wall that prevents the inflow of molten metal waste S into the second section 132, and while functioning in the first section 131, it flows out from the first section 131 into the second section. Resistance to the airflow toward (132) can be reduced.

By forming a slit in the first section 131, the distance L is secured to be long, effectively preventing the inflow of molten metal residues S into the second section 132, and forming a slit in the first section 131. This can suppress pressure loss due to resistance to air flow.

In addition, when forming a slit in the first section 131, the states of the liquid phase, reaction solid, and solid phase such as molten metal residue (S) mixed into the gas are considered. In the case where solid molten metal waste S flies into the first section 131 together with gas, it is possible to avoid clogging of the slit by the molten metal waste S. By using the tip 20 provided with the suction recess 120 (FIG. 4(a)), the fluctuation of the molten metal in the sleeve 11 is suppressed, so that the gas flowing into the suction path 51 is either liquid or Since solid molten metal residue S is difficult to mix, it is suitable for forming slits in the first section 131.

[First modification of the third embodiment]

As shown in FIG. 18, the first section 131 extends in the horizontal direction, and the second section 132 extends upward (or downward) with respect to the section connection portion 133 surrounding the first section 131. It may be extended to . The collection unit 134 extends downward with respect to the section connection unit 133.

According to the example shown in FIG. 18, like the third embodiment, the gas flowing out of the first section 131 is drawn into the outer periphery of the side wall 131B and flows into the second section 132. Therefore, the molten metal residue S, etc. can be separated from the gas and collected by inertial force, centrifugal force, and collision of the air current with the side wall 131B or the inner wall 133A of the section connecting portion 133. The molten metal residue (S) separated from the gas is stored in the inner wall of the section connection part 133 and the inside of the collection part 134 by its own weight.

In the example shown in FIG. 18 as well as the third embodiment, the positional relationship between the outlet 131A of the first section 131 and the inlet 132A of the second section 132 can be determined. The position Ps1 of the outlet 131A in the extension direction D4 of the first section 131 is forward (the tip of the arrow) in the extension direction D4 compared to the position Ps2 of the inlet 132A. It is preferable if it is located on the side. The difference between the positions Ps1 and Ps2 corresponds to the difference (distance L) between the heights H1 and H2 described above.

[Second modification of the third embodiment]

Figure 19 shows the collection structure 130 in more detail. Components similar to those of the collection structure 130 shown in FIG. 16 are given the same symbols.

The collection structure 130 shown in FIG. 19 includes a first section 131 and a second section 132, a section connection section 133, and a collection section 134.

Similar to the configuration shown in FIG. 16 , the second section 132 is connected to the section connecting portion 133 at a position where the first section 131 is surrounded by the section connecting portion 133. The difference (distance L) between the heights H1 and H2 of the outlet 131A and the inlet 132A is, for example, 5 mm.

In the example shown in FIG. 19, the section connecting portion 133 and the collecting portion 134 are separated and assembled by respective flanges 133F and 134F. The flanges 133F and 134F collide with the annular center ring 135 interposed therebetween and are restrained by the clamp 136. The center ring 135 includes an O-ring 135A and a metal ring 135B that supports the O-ring 135A from the inner circumference side against a decrease in pressure in the collection portion 134 due to vacuum suction.

The collection unit 134 consists of a pipe 134A and a cover member 134B inserted into the lower end of the pipe 134A. The length of the collection unit 134 can be extended by adding another pipe and a connecting member (nipple) with male threads at both ends to the collection unit 134, thereby expanding the volume of the collection unit 134. there is.

The diameter of the lower end of the section connecting portion 133 is gradually reduced toward the collection portion 134, and a flange 133F is provided at the lower end of the section connecting portion 133. This flange 133F functions as a backflow prevention portion with a small opening cross-sectional area relative to the collection portion 134. This backflow prevention unit prevents backflow of molten metal residues S from the inside of the collection unit 134 to the outside.

The cross-sectional area of the opening inside the flange 133F is smaller than the cross-sectional area of the opening inside the flange 134F of the collecting portion 134 with which the flange 133F strikes via the center ring 135. The ratio of the inner diameter of the flange 133F to the inner diameter of the collecting portion 134 can be set to, for example, 1.5 to 3 times, but is not limited to this.

Since the backflow prevention part (flange 133F) is disposed between the collecting part 134 and the second section 132, the molten metal residue S stored in the collecting part 134 is pulled up by the air current. Even if it is directed upward, the backflow prevention part (flange 133F) suppresses the outflow of molten metal waste S, etc. from the collection part 134, and prevents the molten metal waste S inside the collection part 134. etc. can be stored.

As described above, the suction path 51 is used both for vacuum suction and air blowing. The backflow prevention unit can prevent molten metal residues S from flowing out of the collection unit 134 during air blowing. In addition, when switching between vacuum suction and air blow, there is no need to change the structural members of the suction path 51, including the collection structure 130, so there is no assembly work for the suction path 51. Production can continue to run.

The first section 131 includes a flange 131F obtained by drilling a disk-shaped blank flange, and cylinders 131D and 131E joined by welding to the upper and lower surfaces around the hole of the flange 131F. It is manufactured including pipes, nipples, etc.

Between the upper end portion 133B of the section connection portion 133 and the outer peripheral portion 131C of the first section 131, between the flange 131F of the first section 131 and the flange 133G of the section connection portion 133. It is sealed with an annular center ring 137 interposed therebetween. Flange 133G and flange 131F are restrained by clamp 138.

A corrugated box-shaped pipe 139 is connected to the second section 132 via a center ring 137. Since molten gas residues (S) mixed into the gas can be sufficiently removed by the collection structure 130, the corrugated box-shaped piping 139 can be used, which has a higher degree of freedom of installation compared to piping without elasticity. .

In the example shown in FIG. 19, the backflow prevention part (flange 133F) having an opening concentric with the axis of the section connecting part 133 and the collecting part 134 is connected to the section connecting part 133 and the collecting part 134. It is placed at the joint. It is not limited to this example, and the collection structure 130 may include a backflow prevention portion having an opening eccentric with respect to the axis of the section connection portion 133 and the collection portion 134, or a semicircular backflow prevention portion. This backflow prevention portion is not limited to the joint between the section connecting portion 133 and the collecting portion 134, and may be disposed inside the pipe 134A of the collecting portion 134, for example.

[Fourth Embodiment]

Next, with reference to FIG. 20, a fourth embodiment of the present invention will be described. The collection structure 140 shown in FIG. 20 is provided with a ball valve 141 capable of opening and closing the outlet 144A provided in the collection unit 144. Except for this point, the collection structure 140 is configured similarly to the collection structure 130 of the third embodiment. The collection unit 144 is formed integrally with the section connection unit 133.

Hereinafter, description will be given focusing on matters that are different from the collection structure 130 of the third embodiment.

At the lower end of the collection unit 144, an outlet 144A is provided through which molten metal residues S and the like can pass.

The ball valve 141 has a ball 141A as a valve body and a housing 141B in which a valve seat that receives the ball 141A is provided. The ball valve 141 opens and closes by rotating the ball 141A around an axis 141C orthogonal to a passage (bore) inside the housing 141B.

According to the collection structure 140, it is possible to collect the molten metal residues (S) by closing the ball valve 141 and simultaneously discharge the molten metal residues (S) by opening the ball valve 141.

The location of the outlet 144A is not necessarily limited to the lower end of the collection unit 144. Even if the outlet 144A is provided on the side wall 144B of the collecting portion 144, molten metal residues S, etc. can be discharged by the pressure of the air flow during air blowing.

Additionally, regardless of the position of the outlet 144A, manually opening the ball valve 141 to extract the molten metal residue S, etc. from the outlet 144A cannot be hindered.

The collection structure 140 is,

(1) In the collection unit 144, a ball capable of opening and closing the outlet 144A provided at a position lower than the height H2 of the connection point (inlet 132A) between the section connection part 133 and the second section 132. A valve 141 (a type of open/close valve) is provided.

(2) It is preferable that a molten metal waste receiver 142 to receive molten metal waste S is installed below the ball valve 141.

The ball valve 141 is driven by the electric or air (compressed air) actuator 143 to open and close the outlet 144A.

When vacuum suction is performed through the suction path 51 with the outlet 144A closed by the ball valve 141, the molten metal residue S separated from the gas is collected inside the collection unit 144. do.

When the outlet 144A is opened by the ball valve 141, the molten metal residues S stored inside the collection unit 144 can be discharged to the outside of the collection unit 144. In the example shown in FIG. 20 , molten metal waste S and the like fall from the open outlet 144A into the molten metal waste container 142 .

The ball valve 141 is preferably opened when air is blown through the suction path 51. Since the ball valve 141 is opened when air is blown, the molten metal residue S collected inside the collection unit 144 during vacuum suction can be discharged to the outside of the collection unit 144. In addition to the movement of the ball 141A when the ball valve 141 is opened, the pressure of the air flow during air blowing also acts, so that the molten metal residue S attached to the ball 141A is also moved to the ball 141A. It can be removed from the system and discharged to the outside.

As described above, by using the tip 20 provided with the suction recess 120 (FIG. 4(a)), the fluctuation of the molten metal in the sleeve 11 is suppressed, and thus the suction path 51 It is difficult for molten metal residue (S) in the liquid or solid state to be mixed into the inflowing gas. Therefore, in order to avoid the operation of the ball valve 141 being affected by the adhesion of the molten metal residue S in a liquid or solid state, the molten metal residue S, etc., is collected by the collection structure 140, and the molten metal residue S is collected. It is possible to operate stably while discharging (S) etc. In addition, even if thin solidified pieces of molten metal residue S or lubricant are mixed into the gas, the operation of the ball valve 141 is not affected.

According to a test using the tip 20 provided with the suction concave portion 120, the fluctuation of the molten metal in the sleeve 11 is suppressed, thereby preventing the solid molten metal residue S from entering the gas flowing into the suction path 51. Even if it is mixed, the molten metal residue S, which is stored in a small amount and solidified into a lump shape, is not mixed into the gas and flies to the collection unit 144. Therefore, it is possible to avoid influencing the operation of the ball valve 141 and operate it stably.

By opening the ball valve 141 by the actuator 143 during air blowing, molten metal residues S and the like can be automatically discharged to the outside of the collection unit 144 during air blowing. Since the molten metal residues S, etc. are removed from the inside of the collection unit 144 each time air is blown, the amount of molten metal residues S, etc. stored in the collection unit 144 can be suppressed. By doing so, the amount of molten metal residue S, etc., sucked into the second section 132 communicating with the collection unit 144 can be effectively reduced, which can also contribute to reducing the cleaning frequency of the vacuum filter 31.

In the present embodiment, since the molten metal residues S and the like are discharged to the outside of the collection unit 144, it is sufficient to clean the molten metal waste container 142 where the molten metal residues S and the like are accumulated.

A larger volume of the molten metal waste container 142 makes it possible to reduce the frequency of cleaning, which is advantageous in terms of work efficiency. It is desirable to determine the volume of the molten metal waste container 142 appropriately in consideration of work efficiency and the manufacturing cost of the molten metal waste container 142.

According to the collection structure 140 of the present embodiment, the ball valve 141 is opened when air is blown, and the molten metal residue S, etc., can be discharged from the inside of the collection unit 144 into the molten metal residue receiver 142. Therefore, production can be continued while automatically and regularly extracting the molten metal waste S collected during vacuum suction from the collection unit 144.

Instead of the ball valve 141, another valve capable of reliably closing the outlet 144A of the collection unit 144 during vacuum suction, for example, a butterfly valve or a gate valve, may be used.

[Fifth Embodiment]

Next, with reference to FIGS. 21 to 24, the vacuum piping structure 150, which is a part of the suction path 51 according to the fifth embodiment of the present invention, will be described. The fifth embodiment relates to facilitating cleaning of molten metal residues (S) etc. adhering to the inside of vacuum piping. The vacuum piping structure 150 disclosed in the fifth embodiment is die-casted starting with the injection devices 1 and 6 of the first and second embodiments and the die casting machine 100 provided with the injection device 1 or 6. It can be applied to the machine's injection device and die casting machine.

The configuration disclosed in the fifth embodiment and the modification of the fifth embodiment can also be applied to an injection device provided with a sleeve and a plunger including a tip in which the suction recess 120 is not defined.

The fifth embodiment shows the structure of the suction path 51 (vacuum piping) that vacuum-suctions the space formed by communicating from the inner space of the sleeve 11 to the cavity 23. Here, the suction path 51 that suctions the internal space of the sleeve 11 from each of the suction ports 14 to 17, which are a plurality of holes drilled in the sleeve 11, is explained. The same applies to the suction path for suctioning the inside of the cavity 23 from the connectors 28 provided at multiple locations.

21 shows a collection unit 152 provided on the suction path 51 through which gas is sucked from the inside of the sleeve 11 through the suction port 14, and a collection unit 152 from the upstream side of the collection unit 152. ) A piping structure 150 for vacuum having a cleaning section 151 extending toward is shown.

The cleaning section 151 includes suction ports 14 to 17 in the suction path 51 connected to the inner space of the sleeve 11, which is the source of molten metal residue S, and molten metal residue S mixed into the gas. It corresponds to the section between the collecting section 152 that collects etc.

For example, molten metal residue may be deposited from the suction port 14 (or 15 to 17) into the suction path 51 due to the influence of variations in the temperature of the molten metal being injected, injection conditions, mold temperature, and mold thermal expansion. There is a possibility that molten metal residues (S), etc. may penetrate and adhere to the inside of the suction path 51. The attached molten metal residues S and the like form an orifice portion in the suction path 51.

Here, in the flow of gas being sucked, the area upstream of the collection unit 152 contains molten metal residues (S) mixed into the gas compared to the area downstream of the collection unit 152 (vacuum tank 36 side). Since the amount is large, it is easy for molten metal residues (S) to adhere to the inner wall of the pipe. Therefore, the cleaning section 151 upstream of the collection section 152 has a higher need to remove molten metal residues S and the like by cleaning compared to the piping downstream of the collection section 152.

That is, the cleaning section 151 is a section in the suction path 51 where cleaning is relatively necessary. In this embodiment, the cleaning work efficiency of the cleaning section 151 is achieved by a structure in which a plurality of pipes 153 forming the cleaning section 151 are connected by a connecting member 160 provided with a grip portion 161. Contribute to the improvement of

In order to easily clean the inside of the pipe 153 over almost the entire length from the suction port 14 (or 15 to 17) to the collection unit 152, the cleaning section 151 is provided with the suction port 14 (or It is preferable that it extends from the vicinity of 15 to 17) to the vicinity of the collection unit 152. In the example shown in FIG. 21 , the flange of the pipe inserted into the suction port 14 (or 15 to 17) and the flange of the pipe 153 are connected by a connecting member 160. Additionally, the flange provided in the collection unit 152 and the flange of the pipe 153 are connected by a connecting member 160.

In addition to the suction path 51 corresponding to the suction port 14, all of the suction paths 51 corresponding to each of the suction ports 15 to 17 may be provided with a cleaning section 151 and a collection section 152. there is. In addition, among the suction paths 51 corresponding to each of the suction ports 14 to 17, the cleaning section 151 and the collection portion ( 152) can also be prepared.

The cleaning section 151 has an overall curved shape due to the plurality of pipes 153 being connected. The plurality of pipes 153 are composed of a straight pipe portion 153A extending in a straight line and a curved pipe portion 153B. When no particular distinction is made between the straight pipe portion 153A and the bent pipe portion 153B, they are referred to as pipe 153. When the cleaning section 151 is disassembled into a plurality of pipes 153, the cleaning section 151 is appropriately configured so that it is easy to remove molten metal residues (S) attached to the inner wall of each pipe 153. It can be divided into pipes 153 of different lengths.

The flanges of the plurality of pipes 153 are connected to each other by the connecting member 160. The connecting member 160 has a gripping portion 161 exposed to the outside of the pipe 153, and can be attached to and detached from the flange by hand using the gripping portion 161.

Vacuum lines are typically constructed using steel pipes and screw joints such as nipples, unions, elbows, etc., and when disassembling these components, it is necessary to use tools.

Unlike a typical vacuum line, the cleaning section 151 of this embodiment can be easily disassembled into a plurality of pipes 153 by hand using the gripper 161, and each pipe 153 can be cleaned. there is. Therefore, it contributes to improving the work efficiency of cleaning the molten metal residue S attached to the inner wall of the pipe 153.

As described above, the vacuum piping structure 150 is,

(1) a cleaning section 151 including a plurality of straight pipe portions 153A and a plurality of bent pipe portions 153B,

(2) A collection unit 152 (box for molten metal residues) is provided.

The suction port 14 (or 15 to 17) and the collection section 152 are connected by a curved cleaning section 151 formed by combining a straight pipe section 153A and a bent pipe section 153B.

The pipe 153 (straight pipe portion 153A and curved pipe portion 153B) does not have flexibility or bendability, unlike a bellows pipe (corrugated box pipe), etc., and is formed into a predetermined shape using an appropriate material such as metal. . In addition, since the bellows pipe (corrugated box pipe) has a shape in which peaks and valleys are formed alternately in the longitudinal direction, the pipe of this embodiment exhibits a wave-shaped uneven shape on the inner circumference ( 153), it is desirable to have a smooth inner peripheral surface in order to suppress adhesion and retention of liquid or solid molten metal residues (S), etc.

Additionally, if liquid or solid molten metal residues (S), etc. do not enter the pipe 153, it is also permitted to use a bellows pipe or the like in the pipe 153.

An appropriate pipe can be adopted as the pipe 153 as long as the connecting member 160 can be mounted and can be used for vacuum suction.

For example, as the straight pipe portion 153A, a carbon steel pipe for piping of Japanese Industrial Standard JIS G 3452 can be used. For example, as the bent pipe portion 153B, a 90° elbow of the NW/KF standard can be used.

In the example shown in FIG. 21, the cleaning section 151 extends upward from the suction port 14 (or 15 to 17) and is curved downward through a horizontally extending portion. One or more straight pipe portions 153A can be used in the portion extending upward from the suction port 14, the portion extending horizontally, and the portion extending downward, respectively.

The straight pipe portion 153A used in the upwardly extending portion and the straight pipe portion 153A used in the horizontally extending portion are connected by a bent pipe portion 153B. The straight pipe portion 153A used in the horizontally extending portion and the straight pipe portion 153A used in the upwardly extending portion are connected by another bent pipe portion 153B.

Additionally, the cleaning section 151 may be curved into a more complicated shape than the inverted U shape shown. For example, the cleaning section 151 may be configured to include a bent pipe portion 156 shown in FIG. 26. The bent pipe portion 156 has a first end 156A, a bent portion 156B, and a second end 156C, and the first end 156A and the second end 156C are open in the opposite direction. there is. The axis X1 of the opening of the first end 156A and the axis X2 of the opening of the second end 156C are parallel to each other and are spaced apart in a direction perpendicular to the axial direction of the opening.

When assembling the cleaning section 151 from a plurality of pipes, manufacturing errors in the pipes can be absorbed by relative rotation of the bent pipe portion 156 and other pipes around the axis centers (X1, X2), thereby forming the cleaning section 151 Easy to assemble.

The collection unit 152 collects molten metal residues (S) separated from the sucked gas by inertial force and centrifugal force.

By this collection unit 152 and the pipes 153 and 154 communicating via the collection unit 152, molten metal residues S and the like are separated from the gas and collected.

The collection unit 152 connects the pipe 153 and the pipe 154, and also stores molten metal residues S and the like therein.

The collection section 152 is connected to the pipe 153 (straight pipe section 153A or curved pipe section 153B) forming the end of the cleaning section 151, and at the same time, the gas from which the molten metal residues (S), etc. are separated flows. Piping 154 is connected. The collection unit 152 and the pipe 154 are formed integrally in the example shown in FIG. 21.

The gas flowing out from the bottom of the straight pipe portion 153A toward the inside and downward of the collection section 152 is diverted from the inside of the collection section 152 toward the pipe 154 and is formed through an opening in the inner wall of the collection section 152. It flows into the pipe 154 from an inlet not shown. In the process where the gas leaked from the straight pipe portion 153A flows inside the collection section 152, the molten metal residue (S), which has a greater weight and density than the gas, is separated from the gas by inertial force and centrifugal force, and is collected in the collection section 152 ) is captured by the inner wall and stored inside.

Instead of the collection structure consisting of the collection section 152, the straight pipe section 153A, and the pipe 154, the collection structure 130 of the third embodiment or the collection structure 140 of the fourth embodiment can be adopted. there is. The straight pipe portion 153A corresponds to the first section 131 described above, and the pipe 154 corresponds to the second section 132 described above.

In addition, instead of the collection structure consisting of the collection part 152, the straight pipe part 153A, and the pipe 154, a known structure capable of separating and collecting molten metal residues S from the gas may be adopted.

Next, with reference to FIGS. 22 to 24, the connecting member 160 (vacuum piping component) will be described. The connecting member 160 provides connection between the suction port 14 (or 15 to 17) and the pipe 153, connection between the pipes 153, and connection between the pipe 153 and the collection unit 152 by the flange. It performs the role of a pipe joint that makes it possible.

FIG. 22 is an enlarged cross-sectional view of the main part showing the configuration of the connecting member 160, and is a cross-sectional view taken along line XXII-XXII in FIG. 21.

The connecting member 160 is a center ring 162 disposed between the flanges 153F and 153F where the pipe 153 is adjacent, and a clamp ( 163) is provided.

As shown in FIGS. 22 and 23, the clamp 163 connects the clamp bodies 163A and 163B to the flanges 153F and 153F with two or more clamp bodies 163A and 163B disposed around the flanges 153F and 153F. ) and includes a gripping portion 161 that can be tightened or loosened.

As shown in FIG. 22, the center ring 162 is placed between the flange 153F of the pipe 153 and the flange 153F of the other pipe 153, and the pipe is separated from the gap between the flanges 153F and 153F. It plays the role of a seal to prevent external air from entering the interior of (153), and is formed in the shape of a hollow cylinder (annular shape).

22, the center ring 162 includes an O-ring 162A that seals between the flanges 153F and 153F, and a metal ring 162B that supports the O-ring 162A from the inner circumference side. ) is provided. This center ring 162 is preferably provided with a mesh 162C for suppressing the passage of molten metal residues S and the like.

The center ring 162 shown in FIG. 22 is a center ring with a mesh of the NW/KF standard, but in addition, it is an appropriate ring that can prevent outside air from entering the inside of the pipe 153 from between the flanges 153F and 153F. A seal member can be employed.

The flange 153F protrudes outward in the radial direction of the pipe 153 at the end of the pipe 153 and is formed in the shape of a hollow cylinder. The flange 153F has an opposing surface F1 that faces the counterpart flange 153F, and a tapered back surface F2.

The opposing surface F1 is perpendicular to the axis A1 of the pipe 153.

The tapered back surface F2 is inclined with respect to the axis A1 in a direction closer to the counterpart flange 153F compared to the outer end in the radial direction of the pipe 153. The tapered rear surface (F2) contacts the inclined tapered inner wall (164A) of the clamp (163).

Flanges (not shown) are formed at the airflow outlet of the suction port 14 (or 15 to 17) and at the airflow inlet of the collection unit 152, respectively. These flanges can also be formed similarly to the flange 153F shown in FIG. 22.

The flanges 153F and 153F shown in Figure 22 are all flanges of the NW/KF standard, ISO 2861 "Vacuum Technology-Dimensions of clamped-type quick-release couplings", and are given similar shapes. However, as long as the structure of the flanged pipe joint is established by the flanges (153F, 153F), the flanges (153F, 153F) may have an appropriate shape, and may have different shapes from each other.

The flange 153F shown in FIG. 22 is connected to the main body of the pipe 153 by welding. This welding operation is not necessarily necessary, and a pipe having a commercially available flange can be used while the flange 153F is provided on the pipe 153.

The clamp 163 is fixed by fastening the flanges 153F and 153F with the center ring 162 interposed therebetween.

Based on the examples shown in FIGS. 22 to 24, the clamp 163 is:

(1) a first clamp body 163A,

(2) a second clamp body 163B,

(3) a hinge mechanism 165 (hinge mechanism);

(4) A fastening mechanism 166 including a grip portion 161 is provided.

In addition to the above, the clamp 163 may be provided with a ratchet mechanism not shown.

FIG. 23 is a diagram showing the clamp 163 in a closed state, and FIG. 24 is a diagram showing the clamp 163 in an open and closed state.

The first clamp body 163A and the second clamp body 163B are formed in a C-shape (circular arc shape) in plan view, and surround the flange 153F (not shown in FIG. 23) of the pipe 153, etc. It is arranged so that

As shown in FIG. 22, the first clamp body 163A and the second clamp body 163B each have an annular groove 164 that receives the flanges 153F and 153F struck through the center ring 162. It is formed. Inside the groove 164, a tapered inner wall 164A corresponding to the tapered back surface F2 of each of the flanges 153F and 153F is formed.

As shown in FIGS. 23 and 24 , one end of the first clamp body 163A and one end of the second clamp body 163B are coupled by a hinge mechanism 165.

Additionally, a fastening mechanism 166 is provided at each other end (fastening end) of the first clamp body 163A and the second clamp body 163B.

The hinge mechanism 165 includes a first pin 165A and a second pin 165B arranged along the axial direction of the pipe 153. The first clamp body 163A is rotatable around the first pin 165A, and the second clamp body 163B is rotatable around the second pin 165B. Therefore, as shown in FIG. 24, the clamp is in an open state between the fastening ends of the first clamp body 163A and the fastening ends of the second clamp body 163B, and a closed state between these fastening ends ( Figure 23) is shown.

When connecting the pipes 153 and 153 by the connecting member 160, as shown in FIG. 24, the fastening portion of the first clamp body 163A and the second clamp body 163B are connected by the hinge mechanism 165. ) is opened between the fastening portions, and the flanges 153F and 153F are inserted into the groove 164 as shown in FIG. 22. Next, as shown in FIG. 23, the first clamp body 163A and the second clamp body 163B are fastened with the fastening mechanism 166, thereby constraining the flanges 153F and 153F.

As shown in FIGS. 22 to 24, the fastening mechanism 166 includes a shaft portion 166A connecting the fastening end of the first clamp body 163A and the fastening end of the second clamp body 163B, and a shaft portion 166A. ) and a washer (166E) are provided that engage with the wing nut (166C).

The tip of the shaft portion 166A is held on the outer peripheral side of the wall 164B corresponding to the bottom of the groove 164 by a pin 166D that penetrates the tip in the axial direction of the first clamp body 163A. . A through hole into which the pin 166D is inserted is formed in the first clamp body 163A. A through hole may be formed in the second clamp body 163B at the same position as the through hole of the first clamp body 163A, but a pin is not inserted into the through hole of the second clamp body 163B.

In the butterfly nut 166C, the portion protruding radially outward from the female thread portion corresponds to the gripping portion 161 that is gripped when attaching and detaching the clamp 163 to the flanges 153F and 153F.

Additionally, the grip portion 161 does not necessarily need to be a part of the wing nut 166C. The gripping portion 161 can be appropriately configured as long as it can grip and attach and detach the connecting member 160 from the flanges 153F and 153F. For example, the gripping portion 161 may be a knob provided on a nut engaged with the shaft portion 166A in a direction perpendicular to the axial direction of the nut.

The flanges 153F and 153F are surrounded by the first clamp body 163A and the second clamp body 163B, and the butterfly nut 166C is manually clamped to the external thread of the shaft 166A using the grip part 161. When tightened, the first clamp body (163A) and the second clamp body (163B) rotate around the pins (165A, 165B), respectively, so that the first clamp body (163A) and the second clamp body (163B) The distance decreases. Therefore, the clamp 163 as a whole is displaced from the radial outer side to the radial inner side and the diameter of the clamp 163 is reduced, thereby pressing the tapered inner wall 164A against the tapered back surface F2 of the flange 153F. In that case, a force in the direction of pulling the flanges (153F, 153F) closer to the axial direction of the pipe (153) is generated due to the wedge effect of both tapered surfaces (164A, F2), so that between the flanges (153F, 153F) While the O-ring 162A is pressed and elastically deformed, the flanges 153F and 153F are restrained.

In that way, since the space between the flanges 153F and 153F is airtightly sealed, vacuum suction can be performed from within the sleeve 11 through the suction path 51. Since the molten metal residue (S) mixed in the sucked gas is separated from the gas and collected by the collection unit 152, the die casting machine can be operated stably while suppressing a decrease in suction efficiency or blockage of the pipe.

When cleaning the cleaning section 151, the first clamp body 163A and the second clamp body ( By loosening 163B) with respect to the flanges 153F and 153F, the first clamp body 163A and the second clamp body 163B can be separated from the flanges 153F and 153F.

In that case, the connection between the flanges 153F and 153F of the pipe 153 and the like by the connecting member 160 is released, so the cleaning section 151 can be disassembled into a plurality of pipes 153 and cleaned in an appropriate manner. You can.

For example, by blowing air to remove molten metal residues S from the inner peripheral part of the pipe 153, or by inserting a rod-shaped member into the inside of the pipe 153, the molten metal is removed by the rod-shaped member. Debris (S), etc. can be removed from the inner peripheral part of the pipe 153. The smooth inner wall of the pipe 153 makes it easier to remove attached molten metal residues (S), etc., compared to the uneven inner wall of the bellows pipe.

In addition, when it is difficult to remove the molten metal residue S, the pipe 153 may be replaced with a spare pipe 153.

According to the fifth embodiment described above, the pipe 153 can be connected or disconnected manually using the gripping portion 161 of the connecting member 160 without using a tool. , disassembly of the cleaning section 151 during cleaning and assembly of the piping 153 after cleaning can be performed in a short time.

The clamp 163 shown in FIGS. 22 to 24 is a clamp for vacuum piping that fastens and secures flanges of the NW/KF standard to each other, but this is only an example. It is exposed to the outside of the pipe 153 and has a gripping part that can manually tighten or loosen the clamp body to the flange, and as long as it can be attached to or detached from the flange by the gripping part, an appropriate configuration can be used in place of the clamp 163. Clamps can be used.

For example, a chain consisting of a plurality of (e.g. four) links (clamp bodies) connected with grooves for receiving the flanges 153F and 153F, and a knob (grip portion) for tightening both ends of the chain with screws. ) can be used. By gripping the knob and rotating it around the axis of the screw to reduce the diameter of the chain, the flanges 153F and 153F are constrained to the inside of the chain.

[Modification of the fifth embodiment]

Like the cleaning section 155 shown in FIG. 25 , it extends upward from the suction port 14 (or 15 to 17) and may be curved in the horizontal direction toward the collection portion 152. The collection unit 152 is connected to the horizontal portion 155H of the cleaning section 155.

In addition, although not shown, the cleaning section may include a portion curved in an inverted U-shape similar to the cleaning section 151 (FIG. 21) described above, and a portion extending in the horizontal direction that continues from this portion. . In that case as well, the collection unit 152 can be connected to the portion extending in the horizontal direction.

[Sixth Embodiment]

Referring to FIG. 27, the structure of the suction path 52 through which gas is sucked from the cavity 23 through the cavity suction port (connector 28) formed in the molds 21 and 22 will be described.

The suction path 52 is configured to include a vacuum tank and a vacuum pump, similar to the above-described suction path 51 (FIG. 2) connected to the suction ports 14 to 17 of the sleeve 11.

Even if this suction path 52 is provided with the collection structures 130 and 140 of the third and fourth embodiments described above, or the vacuum piping structure 150 and the connecting member 160 of the fifth embodiment, good night.

In the example shown in FIG. 27, a collection structure 130 is provided on the suction path 52 through which gas is sucked from the cavity 23 through the connectors 28 of the molds 21 and 22. The suction path 52 has a cleaning section 151 extending from the vicinity of the connector 28 to the vicinity of the collection portion 134.

According to the sixth embodiment, the molten metal residue (S), etc. mixed in the gas sucked from the cavity 23 through the connector 28 to the suction path 52 is separated from the gas by the collection structure 130 and the collection unit. It can be captured inside (134).

In addition, the cleaning section 151 can be easily disassembled into a plurality of pipes 153 by the connecting member 160 with the gripping portion 161 (FIGS. 23 and 24), and each pipe 153 and the collection portion are connected to each other. (134) The molten metal residue (S) attached to the back can be cleaned.

In addition to the above, it is possible to select the configuration exemplified in the above embodiment or change it to another configuration as appropriate, as long as it does not deviate from the main point of the present invention.

100: Die casting machine 1, 6, 6A: Injection device
2: Vacuum suction system 3: Control unit
4: Movable panel 5: Fixed panel
7: Tie bar 8: Machine base
9: Pressurized air supply system 10: Hole
11: Sleeve 11A: Inner periphery
11B: Rear end 11C: Tapered face
11D: Hole for sealant piping 12: Plunger
13: pouring port 14 to 17: suction port
18: molten metal 18A: molten metal
19: Plunger rod 20: Plunger tip
20A: front end 20B: rear end
20C: Outer periphery 20D: Tip joint
21: fixed mold 22: movable mold
23: cavity 24: runner
25: Gate 27: Seven Bent
28: Connector (cavity suction port) 31: Vacuum filter
32: pressure detection unit 33: selection valve
34: Confluence/distribution unit 35: Vacuum/air blow switching valve
36: vacuum tank 37: vacuum pump
38: pressurized tank 39: compressed air source
41: extrusion plate 42: extrusion pin
43: Ladle 51: Suction path
51A: Areas 55, 56: Piping
60: sealant supply device 61: sealant
62: container 70: sliding movement seal
70A: inner periphery 70B: outer periphery
71: Discontinuity 72: Seal retainer member
72A: outer periphery 75: front space
79: Seal member 79A: Outer end
80: discontinuity 80B: boundary
81: first sliding movement seal 82: second sliding movement seal
88: space 89, 90: gap
120: Suction recess 130: Collection structure
130F: Euro 131: 1st leg
131A: outlet 131B: side wall
131C: outer periphery 131D, 131E: whole body
131F: Flange 132: Second section
132A: Inlet 133: Section connection part
133A: inner wall 133B: upper part
133F: Flange (backflow prevention part) 133G: Flange
134: collection unit 134A: piping
134B: Cover member 134F: Flange
135: Center ring 135A: O-ring
135B: Metal ring 136: Clamp
137: Center ring 138: Clamp
139: Piping 140: Collection structure
141: ball valve 141A: ball
141B: Housing 141C: Shaft
142: Molten metal waste receiver 143: Actuator
144: collection unit 144A: outlet
144B: Side wall 150: Vacuum piping structure
151: cleaning section 152: collection section
153: Piping 153A: Straight pipe section
153B: Bend 153F: Flange
154: Piping 155: Cleaning section
156: Bend pipe portion 156A: First end
156B: Bend portion 156C: Second end
160: Connecting member 161: Holding part
162: Center ring 162A: O-ring
162B: Metal ring 162C: Mesh
163: Clamp 163A, 163B: Clamp body
163B: Clamp body 164: Groove
164A: Tapered inner wall 164B: Wall
165: Hinge mechanism 165A, 165B: Pin
166: Fastening mechanism 166A: Shaft part
166C: Wing nut 166D: Pin
201: 1st Daegyeongbu 202: 2nd Daegyeongbu
202A: Area 202B: Outer circumferential surface
202C: Seal Pussy Home 203: Blind Women
203A: Outer periphery 203B: Width of both sides
631: first pipe 631A: outlet
632: second pipe 632A: outlet
701: one end 701A: anterior convex portion
701B: Cross section 702: Other end
702A: rear convex portion 702B: cross section
711: first gap 712: second gap
713: third void 715, 716: partition
717: concave portion 718: convex portion
791: Seal member A: Circuit
A1: Axis D1: Advance and retreat direction
D2: Diametrical direction D3: Circumferential direction
D4: Direction of extension protrusion F1: Opposite face
F2: Taper back Gp: Gap
H1, H2: Height P0, P1, P2: Pressure
Ps1, Ps2: Position R1: Projection range
S: Molten metal residue X1, X2: Axis

Claims (21)

An injection device comprising a sleeve into which molten metal is supplied, a plunger capable of advancing and retracting from the inside of the sleeve, and injecting the molten metal by the plunger toward a cavity of a die casting machine,
The tip of the plunger is defined with a suction concave portion that retreats radially inward with respect to the inner peripheral portion of the sleeve and is continuous in the circumferential direction,
It is configured to be capable of suctioning the space ahead of the front end of the tip and the inside of the suction concave portion,
In the sleeve, two or more suction holes that penetrate the sleeve on the inner and outer sides and are capable of suctioning the inner side of the sleeve when the plunger advances are formed side by side in the forward and backward direction of the plunger,
Depending on the position of the plunger advancing with respect to the sleeve, at least one of the two or more suction ports is optionally in communication with the space in front of the space, and at least one of the two or more suction ports is selectively connected to the inside of the suction recess. characterized by communicating
Injection device of die casting machine. According to claim 1,
The two or more suction ports are arranged at predetermined intervals in the advance and retreat direction,
The tip has a first large-diameter portion located on the front side in the advance and retreat direction, and a second large-diameter portion that is located on the rear side in the advance and retreat direction and defines the suction concave portion between the first large diameter portion, and
The number of suction ports is n,
The dimension of the suction port in the forward and backward direction is Ls2,
The spacing between the suction ports adjacent in the advance and retreat direction is Ls3,
The dimension of the suction concave portion in the advance and retreat direction is Lp0,
The dimension of the first large diameter portion in the advance and retreat direction is Lp1,
When the dimension of the second large diameter portion in the advance/retract direction is Lp2,
Lp1＜n×Ls2+(n-1)×Ls3
Injection device of die casting machine. According to claim 2,
If the distance in the advance and retreat direction from the pouring port of the sleeve to the suction port closest to the pouring port is Ls1,
Lp0<Ls1+n×Ls2+(n-1)×Ls3-Lp1
Injection device of die casting machine. According to claim 2 or 3,
Lp2≥Ls2
Injection device of die casting machine. According to claim 2,
Lp0＞Ls3 people
Injection device of die casting machine. According to claim 1,
A sliding seal continues in the circumferential direction along the outer periphery of the tip of the plunger and slides on the inner periphery of the sleeve as the plunger advances and retreats,
The sliding seal is located in a region other than the suction recess in the tip.
Injection device of die casting machine. According to claim 6,
A seal member disposed on the radial inner side of the sliding seal and sealing the gap between the sliding seal and the tip.
Injection device of die casting machine. According to claim 7,
Provided with two or more sliding seals aligned in the advance and retreat direction of the plunger,
wherein the seal member is disposed between at least one sliding seal and the tip.
Injection device of die casting machine. According to claim 7 or 8,
The sliding seal includes a discontinuous portion that is a discontinuous portion in a part of the circumferential direction and is formed in an annular shape, and the tip is pressed in a state in which the inner peripheral portion of the sleeve is pressed toward the outer side in the radial direction. and is mounted on the sleeve,
The seal member is formed in an annular shape and is bent between the sliding seal and the tip to seal the gap.
Injection device of die casting machine. According to claim 1,
In the tip, an outer peripheral portion of the first large-diameter portion located on the front side in the advance and retreat direction, and an outer peripheral portion of the second large-diameter portion located on the rear side in the advance and retreat direction and defining the suction concave portion between the first large-diameter portion and the first large-diameter portion. Equipped with a sealant supply device capable of supplying the sealant to,
A gap between the inner peripheral portion of the sleeve and the outer peripheral portions of each of the first large diameter portion and the second large diameter portion is sealed by the sealant.
Injection device of die casting machine. According to claim 1,
A collection structure is provided to collect molten metal residue mixed in the gas on a suction path through which gas is sucked from the inside of the sleeve through the suction port,
The capture structure is,
a collection unit connected to the suction path and receiving the molten metal residue;
a first section of the suction path extending from an upstream side of the suction path toward the collection unit;
a section connection portion that surrounds the first section from the outside and extends beyond the first section to the collection section;
A second section of the suction path connected to the section connection part is provided at a position where the first section is surrounded by the section connection part,
The first section and the second section are in communication through the inside of the section connection part.
Injection device of die casting machine. According to claim 11,
The first section extends downward toward the collection unit,
The height of the outlet of the first section is less than or equal to the height of the inlet of the second section.
Injection device of die casting machine. The method of claim 11 or 12,
The section connection portion is provided with a backflow prevention portion having a small opening cross-sectional area with respect to the collecting portion.
Injection device of die casting machine. According to claim 11,
The capture structure is,
an outlet provided in the collection unit through which the molten metal residue can pass;
Equipped with a valve capable of opening and closing the outlet
Injection device of die casting machine. According to claim 1,
a collection unit provided on a suction path through which gas is sucked from the inside of the sleeve through the suction port, and collecting molten metal residue mixed in the gas;
In at least a portion of the suction path, a cleaning section is provided extending from an upstream side of the collection section toward the collection section,
The cleaning section has a curved shape from a plurality of pipes whose flanges are connected to each other by connecting members,
The connecting member has a grip portion exposed to the outside of the pipe, and is detachable from the flange by the grip portion.
Injection device of die casting machine. According to claim 15,
The connecting member is,
A center ring disposed between the flanges,
Provided with a clamp that restrains the flanges in a collision state via the center ring,
The clamp is,
Two or more clamp bodies disposed around the flange,
Comprising the gripping part capable of fastening or loosening the clamp body with respect to the flange
Injection device of die casting machine In a die casting machine having a suction path for vacuum suction within a space formed by communicating from the inner space of the sleeve to the cavity of the mold,
A collection structure is provided to collect molten metal residue mixed in the gas on a suction path in which gas is sucked from the cavity through a cavity suction port formed in the mold,
The capture structure is,
a collection unit connected to the suction path and receiving the molten metal residue;
a first section of the suction path extending downward from an upstream side of the suction path toward the collection unit;
a section connection portion that surrounds the first section from the outside and extends beyond the first section to the collection section;
A second section of the suction path connected to the section connection part is provided at a position where the first section is surrounded by the section connection part,
The first section and the second section are characterized in that they communicate through the inside of the section connection part.
Die casting machine. In the structure of the vacuum piping of a die casting machine that vacuum-suctions the space formed by communicating from the inner space of the sleeve to the cavity of the mold,
a collecting part provided on a suction path through which gas is sucked from the cavity through a cavity suction port formed in the mold, and collecting molten metal residue mixed in the gas;
At least a portion of the suction path includes a cleaning section extending downward from an upstream side of the collection unit toward the collection unit,
The cleaning section has a curved shape from a plurality of pipes whose flanges are connected to each other by connecting members,
The connecting member has a grip portion exposed to the outside of the pipe and is removable from the flange by the grip portion.
Structure of vacuum piping for die casting machine. In the casting method using an injection device that injects the molten metal toward the cavity of the die casting machine by means of a plunger that can advance and retreat from the inside of the sleeve into which the molten metal is supplied,
The tip of the plunger is defined with a suction concave portion that retreats radially inward with respect to the inner peripheral portion of the sleeve and is continuous in the circumferential direction,
In the sleeve, two or more suction holes that penetrate the sleeve on the inner and outer sides and are capable of suctioning the inner side of the sleeve when the plunger advances are formed side by side in the forward and backward direction of the plunger,
At least one suction port communicating with the inside of the suction concave portion while depressurizing the space ahead of the front end of the tip by suction through the at least one suction port communicating with the space ahead of the front end of the tip. Characterized in that the inside of the suction concave portion is decompressed by suction.
Casting method. In clause 19
It is continuous in the circumferential direction along the outer periphery of the tip of the plunger, and is located on the radial inner side of the sliding seal that slides the inner periphery of the sleeve as the plunger advances and retreats, between the sliding seal and the tip. Mounting the sliding seal and the seal member to the plunger and the sleeve with a seal member sealing the gap disposed,
Suctioning the front space and the inside of the suction concave portion
Casting method. The method of claim 19 or 20,
After completing the suction in the sleeve through the suction port,
Using a pressurized tank, blowing air to the inside of the sleeve through the suction port
Casting method.

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