WO2019225272A1 - Injection device for die casting machine, die casting machine, vacuum pipe structure for die casting machine, and casting method - Google Patents

Abstract

In order to prevent the inflow of outside air into a suctioned sleeve and suppress turbulence in molten metal, thereby achieving a stable suctioning of the interior of the sleeve, an injection device 1 in a die casting machine 100 is configured so as to be capable of suctioning a suction recess 120 partitioned in the tip 20 of a plunger 12 and a space 75 in front of the front end of the tip 20. Two or more suction openings 14–17 capable of suctioning the inside of a sleeve 11 are formed side by side in the sleeve 11 in the direction D1 in which the plunger 12 advances/retreats. In accordance with the position of the plunger 12 as the plunger advances relative to the sleeve 11, at least one of the suction openings among the two or more suction openings 14–17 selectively communicates with the space 75 in the front, and at least one of the suction openings among the two or more suction openings 14–17 selectively communicates with the suction recess 120.

Description

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

The present invention relates to an injection device that injects a molten metal toward a cavity of a die casting machine by a plunger that can advance and retreat inside a sleeve, a die casting machine including the injection device, a structure of vacuum piping for the die casting machine, and an injection of the die casting machine The present invention relates to a casting method using the apparatus.

In order to efficiently increase the degree of vacuum in the sleeve to which the molten metal is supplied and in the cavity from which the molten metal is injected by the plunger, the technique of sucking the inside of the sleeve is known in order to suppress the occurrence of entrapment in the die-cast product. Yes.
For example, Patent Document 1 describes a die casting machine that sucks the inside of a sleeve using a vacuum pump.
Such a die casting machine includes first to fourth suction devices for sucking the inside of the sleeve and the cavity of the mold. A first suction device and a second suction device are used for suction inside the sleeve. The first suction device sucks the inside of the sleeve through a hole located in the vicinity of the pouring port into which a molten metal such as an aluminum alloy is poured and in front of the pouring port. The second suction device sucks a closed space formed between the constricted portion between the plunger tip and the flange of the plunger rod and the inner peripheral surface of the sleeve, thereby forming the inner constriction of the tip constricted portion and the sleeve. The inside of the sleeve is sucked through a gap between the surface. The suction of the closed space formed by the constricted portion is performed through a through hole formed in the flange of the plunger rod along the axial direction.

In Patent Document 1, after the molten metal is injected into the sleeve, when the plunger advances to a position where the pouring port is closed by the plunger tip, first, the first suction device passes through the hole in the vicinity of the pouring port from the tip in the sleeve. Also sucks the gas in the front space. At this time, the gas in the cavity is also sucked through the space in front of the sleeve.
Next, when the plunger advances to a position where the hole in the vicinity of the pouring port is closed by the tip, the suction moves to the second suction device. The second suction device sucks the closed space defined between the constricted portion of the plunger and the inner peripheral surface of the sleeve through the axial through-hole of the flange of the plunger rod, so that the second suction device is in front of the tip in the sleeve. Aspirate the space.
After the suction by the second suction device is started, the suction in the cavity is started by the third suction device.
According to the description of 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. Is suppressed.

JP 2014-117741 A

If outside air flows into the sleeve, which is negative with respect to atmospheric pressure due to suction, the molten metal in the sleeve becomes unclear, the suction holes close due to adhesion of the molten metal droplets, In some cases, the suction efficiency may decrease due to the accumulation.
“Melting metal melt” means, for example, that the outside air blows forward from the tip through the radial gap between the plunger and the sleeve from the rear end of the sleeve, and the molten metal bubbles and scatters or the molten metal surface vibrates violently. say. It is desirable to stably suck the gas in the sleeve without blocking the suction path due to such a violent molten metal or reducing the suction efficiency.
The die-casting machine described in Patent Document 1 also has a risk that the hole for suction and the piping may be blocked due to the molten metal being exposed during suction in the sleeve.

In view of the above, an object of the present invention is to realize stable suction in the sleeve by preventing the inflow of outside air into the sucked sleeve and suppressing the rampage of the molten metal.

The present invention is an injection device that includes a sleeve to which molten metal is supplied and a plunger that can advance and retreat inside the sleeve, and injects the molten metal toward the cavity of the die casting machine by the plunger. Is retracted inward in the radial direction with respect to the inner peripheral portion of the sleeve, and a suction concave portion that is continuous in the circumferential direction is defined so that the space ahead of the front end of the chip and the inner side of the suction concave portion can be sucked. The position of the plunger that is configured and is formed in the sleeve so that two or more suction ports that penetrate the sleeve from the inner side to the outer side and that can suck the inner side of the sleeve are aligned in the forward and backward direction of the plunger. Accordingly, at least one of the two or more suction ports selectively communicates with the space in front, and at least one of the two or more suction ports is selectively disposed in the suction recess. And wherein the communicating with.
“Inside the suction recess” means a space defined between the tip and the sleeve.

In the “suctionable configuration”, the injection device is provided with a suction hole or path formed in a sleeve, a plunger tip or the like, and a vacuum suction system is provided for suction through the suction hole or path. Therefore, the inside of the sleeve is configured to be suckable. The vacuum suction system includes, for example, piping, valves, a vacuum pump, a vacuum tank, and the like.

In the injection device for a die casting machine according to the present invention, the two or more suction ports are arranged at predetermined intervals in the advancing / retreating direction, and the tip is positioned on the first large diameter portion located on the front side in the advancing / retreating direction and on the rear side in the advancing / retreating direction And a second large-diameter portion that divides a suction recess with the first large-diameter portion, the number of suction ports is n, the dimension of the suction port in the advancing / retreating direction is Ls2, and suction is adjacent in the advancing / retreating direction. When the interval between the mouths is Ls3, the dimension in the advancing / retreating direction of the suction recess is Lp0, the dimension in the advancing / retreating direction of the first large diameter part is Lp1, and the dimension in the advancing / retreating direction of the second large diameter part is Lp2, Lp1 < n × Ls2 + (n−1) × Ls3 is preferable.

Furthermore, it is preferable to have the requirements shown in any of the following formulas.
Ls1 is a distance in the advancing and retracting 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 for a die casting machine of the present invention includes a sliding seal that is continuous in the circumferential direction along the outer peripheral portion of the tip of the plunger and slides on the inner peripheral portion of the sleeve as the plunger moves forward and backward. Is preferably located in a portion of the chip other than the suction recess.

Furthermore, it is preferable to provide a seal member that is disposed inside the sliding seal in the radial direction and seals a gap between the sliding seal and the chip.

In the above configuration, the sliding seal is preferably configured using a metal material, and the seal member is preferably configured using a rubber-based material.

And it is preferable that the injection device of the die casting machine of the present invention comprises two or more sliding seals arranged in the forward and backward direction of the plunger, and a sealing member is disposed between at least one sliding seal and the tip.

In the die casting machine injection device of the present invention, the sliding seal is formed in an annular shape including a discontinuous portion which is a discontinuous portion in a part in the circumferential direction, and the inner peripheral portion of the sleeve toward the radially outer side. It is preferable that the chip and the sleeve are mounted in a state of pressing, and the seal member is formed in an annular shape and is bent between the sliding seal and the chip to seal the gap.

In the injection device for a die casting machine according to the present invention, the discontinuous portion of the sliding seal connects the first gap and the second gap that are shifted from each other in the circumferential direction and in the forward and backward direction of the plunger, and the first gap and the second gap. The divided portion is preferably sealed from the inside in the radial direction by a seal member.

The injection device for a die casting machine of the present invention includes two or more sliding seals adjacent to each other in the plunger advance / retreat direction, and the discontinuous portions of the slide seals adjacent to each other in the plunger advance / retreat direction are shifted from each other in the circumferential direction. The boundary between adjacent sliding seals is preferably sealed from the inside in the radial direction by a sealing member.

The injection device for a die casting machine according to the present invention includes two or more sliding seals arranged in the advance / retreat direction of the plunger, and the discontinuous portions of the slide seals adjacent in the advance / retreat direction of the plunger are separated from each other in the circumferential direction. It is preferable.

An injection device for a die casting machine according to the present invention includes a tip for suction between an outer peripheral portion of a first large-diameter portion located on the front side in the forward / backward direction and a rear side in the forward / backward direction and the first large-diameter portion. A sealant supply device capable of supplying a sealant to the outer peripheral part of the second large-diameter part that divides the recess is provided, and the inner peripheral part of the sleeve, and the outer peripheral part of each of the first large-diameter part and the second large-diameter part It is preferable that the gap between the two is sealed with a sealant.

In the injection device of the die casting machine of the present invention, a collecting structure for collecting the molten metal mixed in the gas is provided in the course of the suction path through which the gas is sucked from the inside of the sleeve through the suction port. A collection part connected to the suction path for receiving molten waste, a first section of the suction path extending from the upstream side of the suction path toward the collection section, and surrounding the first section from the outside, exceeding the first section And a second section of the suction path that continues to the section connecting section at a position where the first section is surrounded by the section connecting section, and the first section and the second section are: It is preferable to communicate via the inside of a section connection part.

In the die casting machine injection apparatus according to the present invention, the first section extends downward toward the collecting portion, and the height of the outlet in the first section is equal to or lower than the height of the inlet in the second section. It is preferable.

In the injection device for a die casting machine of the present invention, it is preferable that the section connection portion includes a backflow prevention portion having a small opening cross-sectional area with respect to the collection portion.

In the die casting machine injection apparatus according to the present invention, it is preferable that the collection structure is provided with a collection port provided in the collection unit, through which the molten metal can pass, and a valve capable of opening and closing the collection port.

In the die casting machine injection device according to the present invention, a collecting unit that is provided in the course of a suction path through which gas is sucked from the inside of the sleeve through the suction port, and that collects molten metal mixed in the gas, and at least one of the suction paths. A cleaning section extending from the upstream side of the collecting section toward the collecting section, and the cleaning section has a curved shape from a plurality of pipes in which flanges are connected by a connecting member, It is preferable that the connecting member has a grip portion exposed outside the pipe and is detachable from the flange by the grip portion.

In the injection device for a die casting machine of the present invention, it is preferable that the cleaning section extends from the vicinity of the suction port to the vicinity of the collecting portion.

In the injection device for a die casting machine according to the present invention, the connecting member includes a center ring disposed between the flanges, and a clamp that restrains the flanges against each other via the center ring. It is preferable to include two or more clamp bodies arranged around the flange, and a grip part capable of tightening or loosening the clamp body with respect to the flange.

The present invention also relates to a die casting machine having a suction path for vacuum suction of a space formed in communication from the internal space of the sleeve to the cavity of the mold, and a cavity suction port formed in the mold In the middle of the suction path through which the gas is sucked from the cavity, a collecting structure for collecting the molten metal debris mixed in the gas is provided, and the collecting structure is connected to the suction path and receives the molten metal debris and A first section of the suction path extending from the upstream side of the suction path toward the collection section, a section connection section that surrounds the first section from the outside and reaches the collection section beyond the first section, and a section connection section And a second section of the suction path that is continuous with the section connection portion at a position where the first section is surrounded by the first section, and the first section and the second section communicate with each other via the inside of the section connection section. Features.

Furthermore, the present invention relates to a vacuum piping structure of a die casting machine for vacuum-sucking the space formed in communication from the internal space of the sleeve to the cavity of the mold, and suctioning the cavity formed in the mold Provided in the course of a suction path through which gas is sucked from the cavity through the mouth, and collecting part for collecting molten waste mixed in the gas, and at least part of the suction path, from the upstream side of the collecting part A cleaning section extending toward the collecting portion, the cleaning section having a curved shape from a plurality of pipes that are connected to each other by a connecting member, and the connecting member is exposed to the outside of the pipe It has a portion and can be attached to and detached from the flange by a gripping portion.

Further, the present invention is a casting method using an injection device that injects a molten metal toward a cavity of a die casting machine by a plunger that can be advanced and retracted inside a sleeve to which the molten metal is supplied inside. Withdrawing inward in the radial direction with respect to the inner periphery of the sleeve, a suction recess that is continuous in the circumferential direction is defined, and the sleeve penetrates the sleeve from the inner side to the outer side and can suck the inner side of the sleeve Two or more suction ports are formed side by side in the advancing and retreating direction of the plunger, and for suction while reducing the space ahead of the front end of the tip by suction through at least one suction port communicating with the space ahead of the front end of the tip. The inside of the suction recess is decompressed by suction through at least one suction port communicating with the inside of the recess.

In the casting method of the present invention, the sliding is continued radially along the outer peripheral portion of the tip of the plunger and radially inside the sliding seal that slides on the inner peripheral portion of the sleeve as the plunger moves forward and backward. With the seal member sealing the gap between the dynamic seal and the tip, the sliding seal and seal member are attached to the plunger and the sleeve, and the front space and the inside of the suction recess are sucked. It is preferable to do.

In the above-described configuration, it is preferable to maintain a state in which a gap expanding with thermal expansion of the sleeve and the sliding seal is sealed with a sealing member.

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

According to the die casting machine injection apparatus and the casting method using the same according to the present invention, as described later, the inflow of the outside air into the sucked sleeve is prevented and the molten metal is prevented from being disturbed. Suction can be realized. Moreover, according to the structure provided with the collection part of this invention, inflow of the molten metal residue to a vacuum line can be suppressed, and a die-cast machine can be operated stably. Furthermore, according to the vacuum piping structure that can be disassembled into a plurality of parts by hand using the grip portion, it is possible to contribute to improving the efficiency of the cleaning work for removing the molten metal debris.

It is the side view by which a part of die casting machine concerning a 1st embodiment of the present invention was fractured. It is a figure which shows typically the system | suction which suck | inhales the inside of the sleeve of the injection device with which the die-cast machine shown in FIG. 1 is equipped. (A)-(d) is a figure which shows an example of the process from the hot_water | molten_metal supply in a sleeve until a molten metal is inject | poured by advancement of a plunger and it fills with the cavity of a metal mold | die. (A) is the elements on larger scale of the plunger and sleeve of the injection device of the die-casting machine shown in FIG. A sliding seal and a seal member are attached to the plunger and the sleeve. (B) is a sectional view taken along line IVb-IVb of (a). (A) is a figure which shows typically the plunger simple substance shown to Fig.4 (a). (B) is an enlarged view of the discontinuous part of the sliding seal shown to (a). (C) is a figure which shows the example from which the position of the space | gap in a discontinuous part differs from (b). In (b) and (c), the illustration of the seal member is omitted. It is a perspective view which shows the sliding seal and seal member of the state removed from the plunger. (A) is a cross-sectional view schematically showing a sleeve, a plunger, a sliding seal, and a seal member at a position corresponding to the line VIIa-VIIa in FIG. (B) is an enlarged view of the VIIb part shown to (a). (A)-(d) is a figure which shows the modification concerning a sliding seal | sticker and a sealing member, respectively. It is a flowchart of the casting method by die casting. 10 is a flowchart showing the contents (sleeve vacuum and air blow) of processing by the circuit A shown in FIG. (A)-(f) is a figure which shows a series of steps of the sleeve vacuum suction by the die-casting machine shown in FIG. (A)-(e) is a figure for demonstrating the dimensional relationship of the advancing / retreating direction of the some suction opening provided in the sleeve, and each part of a plunger. (A) is a partially broken side view which shows the principal part of the injection device of the die-casting machine which concerns on 2nd Embodiment of this invention. (B) is a sectional view taken along line XIIIb-XIIIb of (a). (A)-(c) is a figure which shows a series of steps of the sleeve vacuum suction by the die-casting machine shown in FIG. It is a figure explaining the injection apparatus provided with the sealing agent supply apparatus which concerns on one Embodiment of this invention. It is a figure which shows typically the collection structure of the molten metal dregs concerning 3rd Embodiment of this invention. (A) is a figure for demonstrating the effect | action by the collection structure shown in FIG. (B) is a figure which shows another example. It is a figure which shows the collection structure which concerns on the 1st modification of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the collection structure which concerns on the 2nd modification of 3rd Embodiment. It is a figure which shows typically the collection structure of the molten metal waste concerning 4th Embodiment of this invention. It is a figure which shows typically a part (cleaning area) and collection part of the suction path which concerns on 5th Embodiment of this invention. It is the XXII-XXII sectional view taken on the line of FIG. It is a figure which shows the clamp of the closed state by the XXIII arrow of FIG. It is a perspective view of the clamp of the open state. It is a figure which shows typically a part (cleaning area) and collection part of the suction path which concern on the modification of 5th Embodiment. It is a figure which shows the example of piping which can be used for the cleaning area of 5th Embodiment. It is a figure which shows typically the collection structure and cleaning area which concern on 6th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[First Embodiment]
A die casting machine 100 according to the first embodiment will be described with reference to FIGS.
(Schematic configuration of die casting machine)
FIG. 1 is a schematic side view (partly including a sectional view) of a die casting machine 100 including an injection apparatus 1 according to an embodiment of the present invention.
The die casting machine 100 is directed to the movable platen 4 on which the movable mold 22 is installed, the fixed platen 5 on which the fixed mold 21 is installed, the machine base 8 that supports the movable platen 4 and the fixed platen 5, and the cavity 23. The injection device 1 for injecting the molten metal 18 and the control device 3 for controlling the operation of each part of the die casting machine 100 are provided.

The die casting machine 100 evacuates the cavity 23 and the inside of the sleeve 11 of the injection device 1 in order to suppress the occurrence of a cast hole (entrapment nest) resulting from the entrainment of gas into the molten metal 18.
The die casting machine 100 is mainly characterized in that the injection device 1 has a structure capable of sufficiently suppressing the inflow of outside air into the sleeve 11 as will be described later in order to stably suck the inside of the sleeve 11. .

The movable platen 4 moves on the machine base 8 to the fixed platen 5 side by a mold opening / closing / clamping 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 to form the cavity 23.
Four tie bars 7 are inserted through the insertion holes of the movable platen 4 and the fixed platen 5. The movable platen 4 moves along the tie bar 7 so as to move forward and backward with respect to the fixed platen 5. As the fixed mold 21 and the movable mold 22 are engaged as shown in FIG. 1, a cavity (product part) 23 is formed between them. A cast 18 is manufactured by injecting and filling molten metal 18 such as aluminum or aluminum alloy into the cavity 23.

The fixed platen 5 is provided with an injection device 1. The injection device 1 includes a sleeve 11 to which the molten metal 18 is supplied inside, and a plunger 12 that can move forward and backward with respect to the sleeve 11 inside the sleeve 11. The injection device 1 injects the molten metal 18 toward the cavity 23 by the plunger 12.
With respect to the injection device 1, the front of the plunger 12 in the movement direction when the molten metal 18 is injected, that is, the side close to the cavity 23 is defined as “front”, and the side far from the cavity 23 is defined as “rear”. .

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 a tip 20. The plunger rod 19 is also simply referred to as a rod 19.

In order to drive the plunger 12 in the front-rear direction, the plunger rod 19 is provided with a hydraulic cylinder (not shown). The plunger rod 19 is connected to the piston rod of the hydraulic cylinder via a coupling (not shown).
When the molten metal 18 is injected, the plunger 12 moves forward, and after the injection, it moves backward. The direction in which the plunger 12 moves forward and backward (front-rear direction) is defined as the “advance / retreat direction”.

The sleeve 11 is a cylindrical body that extends linearly. As shown in FIG. 4A, a tapered surface 11C whose diameter is increased rearward is formed on the rear end portion 11B of the sleeve 11 into which the plunger 12 is inserted. The axial direction of the sleeve 11 coincides with the forward / backward direction D1 of the plunger 12. As will be described later, the injection device 1 is configured to be able to suck the inside of the sleeve 11 by being provided with 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. A front end portion of the sleeve 11 passes through the fixed platen 5 and is fitted into a hole 10 provided in the fixed mold 21. The rear end side of the sleeve 11 protrudes outside the fixed platen 5 and extends in the horizontal direction toward the rear. On the rear end side of the sleeve 11, a pouring port 13 into which the molten metal 18 is poured is provided.
A hot water storage chamber is formed including the inside of the sleeve 11 and the hole 10 of the fixed mold 21. This hot water storage chamber communicates with the cavity 23 via the runner 24 and the gate 25.

The control device 3 controls the drive of the hydraulic cylinder that moves the plunger 12 forward and backward while detecting the position of the plunger 12 in the forward / backward direction D1 with a sensor or the like.
For example, the position of the plunger 12 is detected 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 and a plurality of fixed limit switches can be used.

As shown in FIG. 2, the injection apparatus 1 is provided with a vacuum suction system 2 that sucks the inside of the sleeve 11. The vacuum suction system 2 decompresses the inside of the sleeve 11 by suction using the vacuum pump 37 and the vacuum tank 36. A specific configuration of the vacuum suction system 2 will be described later.
In the sleeve 11 of the present embodiment, a plurality of suction ports 14 to 17 (four in this case) penetrating from the inside to the outside of the sleeve 11 are provided so that the gas inside the sleeve 11 can be sucked by the vacuum suction system 2. ) 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 portion of the sleeve 11 so as to be positioned above the surface 18A (FIG. 4A) of the molten metal 18 supplied to the inside of the sleeve 11.

Providing the suction ports 14 to 17 penetrating the peripheral wall of the sleeve 11 in the thickness direction has a restriction on the opening area as compared with the case where the plunger tip 20 is opened in the axial direction for vacuum suction in the sleeve 11. small. Therefore, according to the suction ports 14 to 17, a large opening area can be secured. In the latter case, a narrow and long path is formed in the sleeve 11 which includes a hole formed in the plunger tip 20 in the axial direction and an axial hole of the rod 19 connected to the hole or a pipe along the rod 19. On the other hand, 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. Therefore, even if the path is blocked by the molten metal residue, it is advantageous from the viewpoint of labor required for the cleaning work.

In the present embodiment, as will be described later, when the plunger 12 moves forward with respect to the sleeve 11, the space 75 in front of the front end 20 </ b> A (on the cavity 23 side) from the position distributed in the forward / backward direction D <b> 1, Is continuously sucked from the inside of the rear suction recess 120.
It is assumed that both the front space 75 and the inside of the suction recess 120 are vacuum-sucked while the advance of the plunger 12 is temporarily stopped.
In order to improve the efficiency of suction by ensuring a large area of the suction opening facing the inside of the sleeve 11, and also from the viewpoint of redundancy in securing ventilation with respect to the suction opening and the passage blockage, A plurality of suction ports 14 to 17 are preferably used for vacuum suction.

Here, for the purpose of 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, it is desired to suppress the inflow of outside air into the front space 75 by sucking from the suction recess 120 (FIG. 4A) while sucking from the front space 75. Therefore, a plurality of suction ports 14 to 17 distributed in the forward / backward direction D1 are provided to the sleeve 11.
Then, while sufficiently securing the area of the opening used for suction, the suction recess 120 is sequentially communicated with the plurality of suction ports 14 to 17 when the plunger 12 moves forward, so that both the front space 75 and the inside of the suction recess 120 are provided. Therefore, the runaway of the molten metal 18 due to the inflow of outside air into the front space 75 can be suppressed.
According to the plurality of suction ports 14 to 17 distributed in the advancing / retreating direction D1, as will be described later, after starting the vacuum suction in the sleeve 11, until the end of the vacuum suction in the sleeve 11, The front space 75 can be sucked through the at least one suction port, and the inside of the suction recess 120 can be sucked through the at least one suction port.

However, it is allowed that the sleeve 11 has only one suction port, or only one suction port among a plurality of suction ports is used. The number of suction ports can be set to an appropriate number in consideration of the length of the sleeve 11, the dimension of the suction port, the length of the plunger tip 20, and the like.
A single suction port that is long in the axial direction or circumferential direction may be formed in the sleeve 11, and a vacuum suction line may be connected to the suction port. However, typically, a suction pipe having a circular cross section is connected to a circular suction port.

The path used for sucking the inside of the sleeve 11 is not limited to a hole penetrating the peripheral wall of the sleeve 11 such as the suction ports 14 to 17, and the path between the outer peripheral portion of the plunger 12 and the inner peripheral portion of the sleeve 11. It may be a gap between them, or may be a hole formed in the plunger tip 20 in the axial direction.

The suction ports 14 to 17 penetrate the peripheral wall of the sleeve 11 in the thickness direction. These suction ports 14 to 17 are arranged at intervals in the forward / backward direction D1 of the plunger 12, and are arranged in the order of the suction ports 14, 15, 16, and 17 from the rear side to the front side of the sleeve 11. . Hereinafter, these suction ports 14 to 17 may be referred to as a first suction port 14, a second suction port 15, a third suction port 16, and a fourth suction port 17, respectively.
The first suction port 14 is located most rearward, and the fourth suction port 17 is located most forward.

The vacuum suction system 2 depressurizes the inside of the sleeve 11 to a predetermined degree of vacuum by removing the gas in the sleeve 11 through the suction ports 14 to 17. Since the inside of the sleeve 11 is depressurized by the vacuum suction system 2, the cavity 23 is also sucked through the sleeve 11, so that the vacuum suction system 2 can decompress the inside of the sleeve 11 and the cavity 23.

The die casting machine 100 typically includes another vacuum suction system (not shown) that directly depressurizes the cavity 23 through a suction path provided in the mold.
Such a vacuum suction system includes, for example, air or the like from the cavity 23 through one or more connection ports 28 provided in a chill vent 27 (Chill-Vent) provided at the boundary between the fixed mold 21 and the movable mold 22. The gas is directly aspirated. In addition to air, the sucked gas can include molten metal, mold release agent vapor, and the like.

The chill vent 27 formed of a metal material having a high thermal conductivity is exhausted from the cavity 23 through the connection port 28, that is, degassing facilitates filling of the molten metal 18 into the cavity 23 and cools the molten metal 18. Thus, the molten metal 18 is prevented from flowing out from the connection port 28 along with the exhaust. The chill vent 27 is divided into a block installed on the fixed mold 21 and a block installed on the movable mold 22.
In place 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 directly sucked from the cavity 23 through the vacuum valve.

The control device 3 (FIG. 1) suctions the inside of the sleeve 11 and the cavity 23 by each system by opening and closing various valves provided in the vacuum suction system of the die casting machine 100 including the vacuum suction system 2 at an appropriate timing. The state can be controlled.

When a plurality of suction ports 14 to 17 are formed in the sleeve 11, the suction ports 14 to 17 as a whole are all of the suction openings provided to a 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, an effect of preventing a precipitating molten metal due to evacuation can be expected.
Also, prior to the start of suction by a vacuum suction system (not shown) provided in the mold, the start of suction by the vacuum suction system 2 using the suction ports 14 to 17 of the sleeve 11 is also prevented to prevent the hot water. can do.
By preventing the hot water, it can contribute to the reduction of defects such as chipping, peeling, and stripping for shot blast.

(Explanation of basic operation of hot water supply and injection)
FIGS. 3A to 3D are diagrams for explaining an example from the hot water supply process to the injection filling process. 3A to 3D, the illustration of the vacuum suction system 2 connected to the suction ports 14 to 17 is omitted.

As shown to Fig.3 (a), the molten metal 18 is supplied in the sleeve 11 by inject | pouring the molten metal 18 into the pouring opening 13 of the sleeve 11 with the ladle 43 of the hot water heater which is not shown in figure (hot-water supply process).
Thereafter, as the plunger 12 moves forward, the space defined in front of the tip 20 of the plunger 12 inside the sleeve 11 can be sucked by the vacuum suction system 2.

Next, as shown in FIG. 3B, the molten metal 18 is ejected by pushing the molten metal 18 in the sleeve 11 to the outside of the sleeve 11 by the tip 20 of the plunger 12 moving forward, as shown in FIG. Then, the molten metal 18 is filled into the cavity 23 through the runner 24 and the gate 25 (injection filling process).

The speed at which the plunger 12 moves forward is variably controlled by giving a control command to the hydraulic cylinder that drives the plunger 12. The advance speed of the plunger 12 is kept low until a predetermined time after the plunger 12 starts to advance, and increases thereafter.
Specifically, in the process from when the plunger 12 starts to advance at the standby position near the rear end of the sleeve 11 to when it moves to the operating position near the front end of the sleeve 11, the plunger 12 is pushed out from the start of advancement of the plunger 12. The time until the molten metal 18 reaches the gate 25 via the runner 24 corresponds to the low speed region. Thereafter, the time until the cavity 23 is filled with the molten metal 18 corresponds to the high speed region.
The control of the forward speed of the plunger 12 is not limited to the above. For example, the forward speed may be increased stepwise such as low speed, medium speed, and high speed.

The forward movement of the plunger 12 is controlled at the timing when the cavity 23 is filled with the molten metal 18 (speed / pressure switching point / VP (Velocity Pressure) switching point) from the above speed control to the pressure of the molten metal 18 in the cavity 23. It is switched to pressure control based on (holding pressure control / pressure increasing control).
Thereafter, when the molten metal 18 in the cavity 23 is cooled and sufficiently solidified with the holding pressure (increased pressure) applied by the plunger 12, the molds 21 and 22 are opened by the movement of the movable platen 4. When the molds 21 and 22 are opened, the products are pushed out by driving the plurality of push pins 42 attached to the extrusion plate 41 (FIG. 1), so that the products can be taken out from the molds 21 and 22.

(Vacuum suction system)
An example of the vacuum suction system 2 capable of sucking the inside of the sleeve 11 will be described with reference to FIG. The vacuum suction system 2 includes a vacuum pump 37, a vacuum tank 36, a merging / distributing unit 34, and suction paths 51 that individually correspond to the suction ports 14 to 17 of the sleeve 11.
Each suction path 51 includes a vacuum filter 31 for evacuation, a pressure gauge for detecting the pressure in the suction path 51, a compound gauge, A pressure detection unit 32 such as a sensor and a selection valve 33 for selectively connecting the suction ports 14 to 17 to 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 communicated with the vacuum tank 36 in a timely manner. Further, depending on the filling rate of the molten metal into the sleeve 11 or the like, all or some of the suction ports can be communicated with the vacuum tank 36.

The vacuum filter 31 suppresses entry of fine droplets of molten metal, solidified pieces, or foreign matters such as dust, which can be mixed into the sucked gas, into the suction path 51. Known in consideration of the low exhaust resistance at the time of vacuum suction and the fact that it does not burn even if it comes into contact with the hot molten metal while restricting the passage of molten liquid droplets and molten metal debris etc. The various vacuum filters 31 can be appropriately selected. For example, a punching metal, a mesh-like or brush-like metal member or the like can be employed for the vacuum filter 31.
In the suction path 51, a collector that collects molten waste can also be installed.

The inside of the vacuum tank 36 is depressurized by evacuation performed by operating the vacuum pump 37. When the vacuum tank 36 is used, the gas in the sleeve 11 can be intermittently sucked into the vacuum tank 36 at appropriate times due to a pressure difference with the vacuum tank 36 while the vacuum pump 37 is continuously operated.
The suction ports 14 to 17 are preferably selectively communicated with the vacuum tank 36 in accordance with the position of the plunger 12 in the forward / backward direction D1, the state of suction from the suction ports 14 to 17, and the like. Based on the pressure in the suction path 51 detected by the pressure detector 32, the predetermined selection valve 33 can be opened and closed. When the pressure detection unit 32 is a pressure sensor capable of outputting a pressure detection signal and the selection valve 33 is an electromagnetic valve, the control device 3 controls the selection valve 33 based on the pressure detection signal from the pressure detection unit 32. A control command can be sent to control the opening and closing of the selection valve 33.

When evacuation is performed by the vacuum suction system 2, based on the pressure difference between the vacuum tank 36 and the sleeve 11 through the suction ports of the suction ports 14 to 17 in which the corresponding selection valve 33 is opened. The gas inside the sleeve 11 flows into the suction path 51. The gas flowing into the suction path 51 is merged with the flow from the other suction path 51 in the merge / distribution section 34 through the vacuum filter 31, the pressure detection unit 32, and the selection valve 33, and further, the vacuum / air blow switching valve 35 and the piping. It flows into the vacuum tank 36 through 55.

At the time of vacuum suction, it is preferable to monitor the pressure (degree of vacuum) in the suction path 51 detected by the pressure detection unit 32 to confirm that vacuuming is normally performed. 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 the suction path 51 are blocked due to the molten metal, or if the opening is narrowed due to the accumulation of molten metal or the vacuum filter 31 is clogged until it is not blocked. The pressure detected by the pressure detector 32 deviates from the normal range to the higher side. In this case, it is preferable to clean the suction port or the suction path 51 in which an abnormality has occurred, clean the vacuum filter 31, or replace it.

From the viewpoint of preventing a reduction in the suction efficiency, the selection valve 33 corresponding to the suction port or the suction path 51 that is clogged or tends to be clogged by a preliminary test or the like is closed based on the detected pressure. Even if the use of the suction port and the suction path 51 is stopped or the use is not completely stopped, the use restriction such as the intermittent use is imposed on the suction port or the suction path 51. Good. In that case, the inside of the sleeve 11 can be evacuated efficiently by using only the remaining suction ports and the suction path 51. Therefore, it is possible to increase the degree of vacuum in the sleeve 11 by continuously sucking while suppressing the progress of clogging and preventing a reduction in suction efficiency.
As described above, the selection valve 33 is not only closed when the detected pressure deviates or when it is desired to suppress clogging, but is also opened and closed according to the position of the plunger 12 in the forward / backward direction D1, as will be described later. Can be controlled.
Further, by selecting use / nonuse of the suction ports 14 to 17 by the selection valve 33 so as to suit the mold or product, the same sleeve 11 can cope with various manufacturing conditions. Since it is not necessary to prepare the sleeve 11 for each manufacturing condition, it is economical.

(Air blow)
In the present embodiment, the suction ports 14 to 17 and the suction paths 51 of the suction ports 14 to 17 are also used as paths for performing an air blow that ejects pressurized air to the inside of the sleeve 11. The molten metal can be removed from the suction path 51 and the suction port by air blow.
A pressurized air supply system 9 (FIG. 2) that performs air blow includes a compressed air source 39 that is a supply source of pressurized air, and a pressurized tank 38 that stores pressure by being supplied with air by the compressed air source 39. It has.
The vacuum suction system 2 and the pressurized air supply system 9 of the present embodiment are configured to include a vacuum / air blow switching valve 35 installed downstream of the merging / distributing unit 34 (downstream during vacuum suction). The vacuum / air blow switching valve 35 switches between the vacuum suction and the air blow by switching the connection destination of the confluence / distribution unit 34 to the vacuum suction pipe 55 and the air blow pipe 56.
The suction path 51 upstream from the merging / distributing unit 34 (upstream during vacuum suction) is common during evacuation and air blow. Therefore, the air blow and the evacuation can be continuously performed without interrupting the production of the cast product by changing the piping to the suction ports 14 to 17.

It is preferable that the pressure detector 32 can detect not only the pressure at the time of evacuation but also the pressure at the time of air blowing. The pressure detected during evacuation is lower than atmospheric pressure. The pressure detected during air blow is higher than atmospheric pressure.

When the vacuum / air blow switching valve 35 is switched to the air blow, air is discharged from the pressurized tank 38 to each suction path 51 through the pipe 56 and the merging / distributing portion 34, and the sleeve 11 from each suction port 14-17. Erupts inside. At the time of air blow, the air flowing into the merging / distributing portion 34 is distributed to the respective suction paths 51. When some of the selection valves 33 are closed, the flow rate of air in the suction port and the suction path 51 corresponding to the open selection valve 33 increases, so that the cleaning effect is enhanced.
Therefore, after air blow is performed only on the suction ports that are likely to be clogged among the suction ports 14 to 17 or after all the air blows of the suction ports 14 to 17 are performed, only some of the suction ports are further determined based on the detected pressure. Air blows can also be focused on.
Even during air blow, it is preferable to monitor the pressure in the suction path 51 by the pressure detector 32. Then, if the detected pressure is out of the normal range at the time of air blow, the air blow is continued, and if it is within the normal range, the air blow is terminated. Further, when the detected pressure is excessive with respect to the threshold value at the time of air blow, it can be notified by sound or light.

The air blowing through the suction ports 14 to 17 is performed in a state where the molten metal 18 is not stored in the sleeve 11, avoiding immediately before the hot water supply, so that the molten metal 18 is not disturbed by the air blow or the hot water supply is disturbed. it can.
For example, as shown in FIG. 3D, at the timing when the cavity 23 is filled with the molten metal 18 (speed / pressure switching point / VP (Velocity Pressure) switching point), air blow is performed on any of the suction ports 14 to 17. It is preferable to implement. At this time, even if the molten metal drops from the suction ports 14 to 17 into the sleeve 11 due to the jet of air, the plunger 12 is then retracted and returned to the original position as shown in FIG. This is because the molten metal residue can be reliably scraped out of the sleeve 11 mechanically by the rear end 20B of the chip 20. That is, the next injection cycle can be started with no molten metal in the sleeve 11.

In addition to performing air blowing through the suction ports 14 to 17 as described above, for the purpose of cleaning the outer peripheral portion of the plunger tip 20, particularly the suction recess 120 described later, for example, when the plunger 12 returns to the original position, the sleeve The air may be ejected to the small diameter portion 203 (FIG. 15) of the chip 20 through a pipe (not shown) provided in the vicinity of the rear end portion of the eleventh. As a result, since the lubricant and molten debris used for tip lubrication are removed from the outer periphery of the tip 20, the amount of foreign matter such as tip lubricant and molten debris sucked by the vacuum suction system 2 can be suppressed. This can contribute to blockage prevention of the suction path 51 and the like.

(Solving problems by preventing inflow of outside air)
The inside of the sleeve 11 sucked by the vacuum suction system 2 (FIG. 2) is a negative pressure with respect to the atmospheric pressure. Therefore, based on the pressure difference between the outside air that 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 causes the plunger tip 20, the sleeve 11, and If the molten metal 18 in the sleeve 11 flows into the space 75 in which the molten metal 18 is stored through the gap between the molten metal 18, the molten metal 18 bubbles and scatters, or the molten metal surface 18 </ b> A shakes violently. Thus, if the molten metal 18 goes out of order, the amount of the molten metal derived from the molten metal 18 in the sleeve 11 will increase accordingly. In addition, when the molten metal 18 is violated, gas is easily caught in the molten metal 18.

In the present embodiment, the suction ports 14 to 17 and the suction due to the molten metal are prevented by preventing the outside air from flowing into the space 75 in which the molten metal 18 in the sucked sleeve 11 is stored and suppressing the ramp of the molten metal 18. The inside of the sleeve 11 is stably sucked while avoiding clogging of the path 51 and a decrease in suction efficiency.
And since entrainment of the gas to the molten metal 18 is suppressed by suppressing the rampage of the molten metal 18, generation | occurrence | production of an entrapment nest can be prevented.

Hereinafter, preferable constituent elements of the injection apparatus 1 will be described from a plurality of viewpoints.
First, members (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 will be described with reference to FIGS. . A structure in which the seal member 79 is combined with the slide seal 70 in order to more sufficiently prevent the inflow of outside air corresponding to the thermal expansion of the members such as the slide seal 70 will be described below. However, the sliding seal 70 alone can prevent the flow of outside air into the space 75 in the front of the sleeve 11 and contribute to the suppression of the molten metal rampage. Therefore, it is sufficient that the injection device 1 includes only the sliding seal 70 of the sliding seal 70 and the seal member 79.

Next, the vacuum suction of both the front space 75 and the inside of the suction recess 120 of the plunger tip 20 will be described in order to suppress the outside air from flowing into the front space 75 in the sleeve 11. The sleeve vacuum suction procedure (FIGS. 11 and 14) performed while suctioning the front space 75 and the inside of the suction recess 120 using the suction ports 14 to 17 of the sleeve 11 is also a control example (FIG. 11). 9 and FIG. 10).
Further, with respect to the suction of both the front space 75 and the inside of the suction recess 120, the requirements relating to the dimensions of the respective parts of the sleeve 11 and the dimensions of the respective parts of the plunger tip 20 are mainly described with reference to FIG. explain.

Furthermore, the supply of the sealing agent to the outer peripheral portion of the plunger tip 20 will also be described with reference to FIG.
If the injection device 1 includes the sliding seal 70 or includes the sliding seal 70 and the seal member 79, it is not always necessary to use a sealant.

With reference to FIGS. 4 to 7, prevention of inflow of outside air into the sleeve 11 will be described.
(Composition of plunger)
First, the structure of the plunger 12 (FIGS. 4A and 4B and FIG. 5A) will be described. As described above, the plunger 12 includes the plunger rod 19 and the plunger tip 20 provided on the front side thereof.
Hereinafter, the radial direction of the plunger 12 and the sleeve 11 is referred to as a radial direction D2. The radial direction D2 is orthogonal to the advance / retreat direction D1.
The circumferential direction of the plunger 12 and the sleeve 11 is referred to as a circumferential direction D3. The circumferential direction of the cross section of the plunger 12 shown in FIG. 4B corresponds to the circumferential direction D3.

The plunger rod 19 is joined to the plunger tip 20 by a tip joint 20D. A male screw (not shown) provided on the rear end side of the chip joint 20 </ b> D is fastened to the female screw portion of the rod 19. A male screw (not shown) provided on the front end side of the chip joint 20 </ b> D is fastened to the female screw portion of the chip 20. On the outer peripheral portion 203A of the small-diameter portion 203 of the chip 20, a two-sided width 203B (FIG. 4B) that engages with a fastening tool is formed.
When the plunger rod 19 is driven in the axial direction, the entirety of the plunger rod 19 and the plunger tip 20 moves forward or backward integrally along the forward / backward direction D1.

The plunger tip 20 has a larger diameter than the plunger rod 19 and pushes the molten metal 18 stored in the sleeve 11 forward when the plunger 12 moves forward.
In order to suppress the 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 flow path (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 on the inner peripheral portion 11 </ b> A of the sleeve 11 as the plunger 12 advances and retreats. At this time, specifically, the sliding seal 70 provided on the plunger tip 20 slides on the inner peripheral portion 11 </ b> A of the sleeve 11. If the plunger tip 20 is worn out after long-term use of the injection device 1, the worn plunger tip 20 can be replaced with a new one. In the present embodiment, the rod 19 does not slide on the inner peripheral portion 11 </ b> A of the sleeve 11. Therefore, even if the plunger tip 20 is replaced, the rod 19 can be used continuously, which is economical.

As shown in FIG. 5A, the plunger tip 20 is located between the first large diameter portion 201 located on the front side in the advance / retreat direction D <b> 1 and the rear side in the advance / retreat direction D <b> 1. And a second large-diameter portion 202 that partitions the suction recess 120. The diameter of the plunger tip 20 at the position of the suction recess 120 is smaller than the diameters of the first large diameter portion 201 and the second large diameter portion 202. Therefore, a 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 referred to as a small diameter portion 203.
The plunger tip 20 can be divided into a plurality of members as appropriate.

The diameter of the first large diameter portion 201 and the diameter of the second large diameter portion 202 can be determined to be the same, but are not limited thereto. 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 outer periphery of the second large-diameter portion 202 Different clearances may be set between each part.

The suction recess 120 is retracted 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 the suction recess 120 is continuous over the entire circumference of the plunger tip 20, between the inner peripheral portion 11A of the sleeve 11 and the outer peripheral portion 203A of the small diameter portion 203 corresponding to the suction recess 120, A void having an annular cross section is formed.

The injection device 1 is mainly characterized in that the plunger tip 20 includes a sliding seal 70 and a seal member 79, as shown in FIGS. 4 (a), 4 (b), and 5 (a). 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 by the sliding seal 70 and the seal member 79, the outside air to the front space 75 in which the molten metal 18 is stored is stored. To prevent inflow.

The injection device 1 of the present embodiment includes two sliding seals 70 arranged in the advance / retreat direction D1, and two seal members 79 arranged in the advance / retreat direction D1.
The number of sliding seals 70 may be 1 or 3 or more. The number of seal members 79 is the same.
In the present embodiment, both the two sliding seals 70 and the two seal members 79 are provided in the second large diameter portion 202 behind the suction recess 120.
The sliding seal 70 and the seal member 79 can be provided on one or both of the first large diameter portion 201 and the second large diameter portion 202.

(Sliding seal)
The sliding seal 70 (FIGS. 4A, 4 </ b> B, and 5 </ b> A) is continuous in the circumferential direction D <b> 3 along the outer peripheral portion of the second large diameter portion 202 of the plunger tip 20. The sliding seal 70 is formed in an annular shape including a discontinuous portion 71 that is a discontinuous portion in a part of the circumferential direction D3. As shown in FIGS. 4B and 6, the sliding seal 70 is a member formed in a substantially annular ring shape.

The sliding seal 70 shown in FIG. 6 is outside the sleeve 11 and is not subjected to external force. Thus, the outer diameter of the sliding seal 70 in an unloaded state is larger than the inner diameter of the sleeve 11. When this sliding seal 70 is provided around the second large diameter portion 202 of the plunger tip 20 and inserted into the sleeve 11 as shown in FIGS. 4A and 4B, the sliding seal 70 is The gap 71 of the discontinuous portion 71 is narrowed and elastically deformed so that the diameter of the sliding seal 70 is reduced.
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. The elastic force of the sliding seal 70 seals between the outer peripheral portion 70B of the sliding seal 70 and the inner peripheral portion 11A of the sleeve 11.

The sliding seal 70 is made of a metal material such as carbon tool steel, hot tool steel (JIS440G4404 SKD61), copper alloy (for example, beryllium copper) having heat resistance and wear resistance required when the injection apparatus 1 is used. Configured.

The sliding seal 70 can be manufactured, for example, by cutting out the above metal material block. Alternatively, by performing a process such as punching from a plate material using the above-described metal material, a member in a form in which the sliding seal 70 is developed in a plate shape is obtained, and the member is bent to obtain a circle. An annularly shaped sliding seal 70 can be obtained.
The diameter, thickness (diameter D2 dimension), width (advancing / retracting dimension D1) of the sliding seal 70, and the dimension of the gap of the discontinuous portion 71 take into account the elasticity and rigidity necessary for sealing. It can be determined as appropriate.
The diameters of the plurality of sliding seals 70 are typically the same. However, this is not the case when the dimension 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 the present 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 on the second large diameter portion 202. The seal holding member 72 is fixed to the plunger chip 20 so as to support 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. The seal holding member 72 may be an annular member that is continuous over the entire circumference, or may be composed of a plurality of members that are divided in the circumferential direction D3.
The seal holding member 72 can have an appropriate diameter so that the sliding seal 70 can be held.
A predetermined clearance can be provided between the outer peripheral portion 72 </ b> A of the seal holding member 72 and the inner peripheral portion 11 </ b> A of the sleeve 11. Reducing this clearance contributes to suppressing the outside air inflow into the front space 75. Note that the seal holding member 72 is allowed to contact the inner peripheral portion 11 </ b> A of the sleeve 11.

When the plunger chip 20 is assembled from a plurality of members including the sliding seal 70 and the seal holding member 72, the sliding seal 70 is supported in a state of being sandwiched by members from both sides in the axial direction (D1). For example, in FIG. 4A, the right sliding seal 70 is sandwiched between two seal holding members 72, and the left sliding seal 70 is attached to the seal holding member 72 and the front end of the second large diameter portion 202. It is sandwiched between the part 202A. Therefore, the position of the sliding seal 70 in the axial direction is restricted when the plunger 12 moves back and forth.

A detailed specific example of the discontinuous portion 71 of the present embodiment will be described.
In order to prevent the outside air from being blown out, the discontinuous portion 71 has a first gap 711, a second gap 712, a first gap 711, and a first gap as shown in FIGS. It is preferable to include a dividing portion 715 that connects the two gaps 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 forward / backward direction D1.
The sliding seal 70 is divided by the first gap 711, the second gap 712, and the dividing portion 715 so as to be separable into one end portion 701 and the other end portion 702 over the entire width direction (D1).

The 1st space | gap 711 and the 2nd space | gap 712 may be arrange | positioned as shown in FIG.5 (c). The positions of the first gap 711 and the second gap 712 in the circumferential direction D3 are interchanged between FIG. 5B and FIG. 5C.
Hereinafter, description will be given based on the example shown in FIG.

As shown in FIG. 5B, the one end portion 701 and the other end portion 702 of the sliding seal 70 are opposed to each other in the circumferential direction D3 with the first gap 711 and the second gap 712 interposed therebetween.
Both the one end portion 701 and the other end portion 702 are formed in a bowl shape.
On the front side of the one end portion 701, a front convex portion 701A that protrudes toward the other end portion 702 is formed. On the rear side of the other end portion 702, a rear convex portion 702A that protrudes toward the one end portion 701 is formed.
Note that the one end portion 701 and the other end portion 702 of the sliding seal 70 do not necessarily have to be formed in a bowl shape, and may simply be formed linearly along the axial direction (D1). . A configuration example (FIGS. 13A and 13B) suitable 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 partitioned between the front end of the front convex portion 701A and the other end portion 702.
The second gap 712 is adjacent to the rear side of the front convex portion 701A and is partitioned between the tip of the rear convex portion 702A and the one end portion 701.
Although the dimension of the circumferential direction D3 of the 1st space | gap 711 and the dimension of the circumferential direction D3 of the 2nd space | gap 712 are set equally, you may differ.

The dividing portion 715 includes an edge of a region (702A) adjacent to the rear side of the first gap 711 and an edge of a region (701A) adjacent to the front side of the second gap 712. The dividing portion 715 is formed along the front end surface 702B of the rear convex portion 702A and the rear end surface 701B of the front convex portion 701A.
The front convex portion 701A of the one end portion 701 and the rear convex portion 702A of the other end portion 702 are protruded by the end surfaces 701B and 702B on the inner side in the width direction (D1) while leaving the first gap 711 and the second gap 712. Arranged to be hit. It is preferable that there is no gap between the end surface 701B and the end surface 702B.

As the relative position in the circumferential direction D3 between the front convex portion 701A and the rear convex portion 702A changes according to the deformation amount in the radial direction D2 of the sliding seal 70, the first gap 711 and the second gap 712 The dimensions change.

The length in the circumferential direction D3 of the front convex portion 701A and the rear convex portion 702A and the dimension in the circumferential direction D3 of the first and second gaps 711 and 712 are the sleeve 11 and the sliding seal 70 when the injection apparatus 1 is used. Even if the dimensions of the first and second gaps 711 and 712 are increased due to the thermal expansion, it is preferably determined appropriately so that the end faces 701B and 702B are maintained in contact with each other.

The division part 715 of this embodiment extends along the direction orthogonal to the width direction (D1) with respect to the center in the width direction of the sliding seal 70.
The dividing portion 715 may be shifted forward or backward from the center of the sliding seal 70 in the width direction.

In order to suppress the outside air from flowing into the front space 75 through the discontinuous portion 71, the discontinuous portions 71 of the two sliding seals 70 are arranged in the circumferential direction D3 as shown in FIG. 4A and FIG. Preferably they are separated from each other. If the positions of the discontinuous portions 71 in the circumferential direction D3 are different, unlike the case where the discontinuous portions 71 are the same, the outside air cannot go straight between the discontinuous portions 71 and 71, and thus the resistance given to the outside air is large. is there.
In the present embodiment, the discontinuous portions 71 of the two sliding seals 70 are separated from each other by 180 °.

It is preferable that the relative rotation of the two sliding seals 70 is restricted using a pin or the like so that the relative positional relationship between the discontinuous portions 71 of the two sliding seals 70 is maintained. In order to restrict the rotation of the two sliding seals 70, for example, a seal holding member 72 positioned 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 are integrally rotated around the axis, the relative positional relationship between the discontinuous portions 71 of the two sliding seals 70 is not changed, and the discontinuous portions 71 are not changed. Can be maintained 180 ° shifted.
Even if the seal holding member 72 located between the two sliding seals 70 is omitted, installation of a detent or the like between the two sliding seals 70, the other seal holding member 72, and the second large diameter portion 202 are omitted. The rotation of the two sliding seals 70 can be restricted by using the front end portion 202A.
When the seal holding member 72 located between the two sliding seals 70 is omitted, like the sliding seals 81 and 82 shown in FIG. The boundary of the sliding seal 70 may be sealed from the radially inner side by the seal member 79.

(Seal member)
Next, the seal member 79 (FIGS. 4A, 5A, and 6) is disposed inside the sliding seal 70 in the radial direction D2. The seal member 79 is a so-called O-ring configured with a continuous annular shape using a rubber-based material.
The seal member 79 bends in the radial direction D2 between the sliding seal 70 and the second large diameter portion 202 of the plunger tip 20, and as shown in FIGS. 4B, 7A, and 7B. The gap Gp between them is sealed. The seal member 79 seals the gap Gp by being pressed by 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.

The sealing member 79 has a sufficiently small elastic modulus as compared with the sliding seal 70. Therefore, even if the gap Gp expands due to the thermal expansion of the sleeve 11 and the sliding seal 70, a sufficient elastic deformation amount can be secured in the seal member 79 to close the gap Gp.
In addition, the sleeve 11 is typically configured using hot mold steel.

Since the seal member 79 is not in direct contact with the inner peripheral portion 11A of the sleeve 11, the influence of frictional heat associated with the advancement and retraction of the plunger 12 is small, and further, the seal member 79 is located on the inner side in the radial direction D2 as compared with the sliding seal 70. Therefore, it is close to the inside of the plunger tip 20 that is typically water-cooled. Therefore, the heat resistance required for the seal member 79 is lower than that of the sliding seal 70. Therefore, a rubber-based material generally having a low heat resistance compared to a metal material can be used for the seal member 79.
Further, since the temperature on the rear end 20B side is lower than the front end 20A side of the chip 20 in contact with the molten metal 18, the sliding seal 70 and the seal member 79 are formed on the second large diameter portion 202 of the chip 20 from the viewpoint of heat resistance. Is preferably provided.

From the viewpoint of heat resistance required when using the injection device 1 and rigidity required for sealing, the seal member 79 is made of, for example, an appropriate rubber system such as fluorine rubber, silicone rubber, chloroprene rubber, nitrile rubber, and acrylic rubber. Materials and resin materials such as polytetrafluoroethylene (PTFE) and polyamide (PA) can be used. For the seal member 79 of the present embodiment, fluororubber having a heat resistant temperature of about 200 ° C. is used.
The seal member 79 has dimensions such as an outer diameter, an inner diameter, and a cross-sectional diameter so that when the gap Gp is maximized, the seal member 79 maintains the sealed state of the gap Gp while reducing the amount of elastic deformation. Can be determined as appropriate.

As shown in FIGS. 7A and 7B, the seal member 79 is held inside a seal holding groove 202 </ b> C that is recessed from the outer peripheral surface 202 </ b> B of the second large diameter portion 202. The seal holding groove 202C is formed in an annular shape over the entire circumference of the second large diameter portion 202 along the circumferential direction D3.
Since the seal member 79 is held in the seal holding groove 202C, displacement in the forward / backward direction D1 is restricted.

7A and 7B, a sliding seal 70 is disposed around the seal member 79 held in the seal holding groove 202C. The seal member 79 has a position (width direction) of the dividing portion 715 in the width direction (D1) of the sliding seal 70 so as to seal the dividing portion 715 in the discontinuous portion 71 of the sliding seal 70 from the inside in the radial direction D2. It is preferable to arrange in the center). In the example shown in FIG. 7B, the outer end 79A having the largest diameter in the seal member 79 is abutted against and closely contacted with the divided portion 715 and the vicinity thereof along the circumferential direction D3 in which the divided portion 715 extends. doing.

When the divided portion 715 that connects 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 outside air that has flowed into the second gap 712 behind the sliding seal 70 However, it can avoid flowing into the front 1st space | gap 711 through the inner side of radial direction D2.

(Manufacture of injection device equipped with sliding seal and seal member)
First, the plunger 12 (FIG. 5 (a)) is manufactured by assembling the plunger tip 20 to which the seal member 79 and the sliding seal 70 are attached and the plunger rod 19.
When the seal member 79 and the sliding seal 70 are attached to the plunger tip 20, the seal member 79 is held around the seal member 79 in a state where the seal member 79 is held in the seal holding groove 202 </ b> C of the second large diameter portion 202 of the plunger tip 20. The sliding seal 70 and the seal holding member 72 are inserted 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, with the advancement of the plunger 12 relative to the sleeve 11, the sliding seal 70 is guided by the guiding tapered surface 11C (FIG. 4 (a)) formed at the rear end portion 11B of the sleeve 11, and in the radial direction D2. The diameter of the sliding seal 70 is reduced by elastically deforming inward. Along with this, 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 elastically deforms in the radial direction D2.

When the plunger 12 is inserted into the sleeve 11, as shown in FIGS. 7A and 7B, the sliding seal 70 presses the inner peripheral portion 11 </ b> A of the sleeve 11 in the radial direction D <b> 2, and the sliding seal 70. The seal member 79 presses the inner peripheral portion 70 </ b> A and the outer peripheral portion 20 </ b> C 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 device, and may be obtained by a modification in which a sliding seal 70 and a seal member 79 are provided to an existing injection device. Even when the existing machine is refurbished, the injection device 1 including the sliding seal 70 and the seal member 79 is passed through the step of attaching the sliding seal 70 and the seal member 79 to the plunger 12 and the sleeve 11 as described above. Can be manufactured.

(Operation and effect of sliding seal and seal member)
In the casting process by the die casting machine 100, in order to suppress the entrainment of air into the molten metal 18, the space 75 in which at least the molten metal 18 is stored inside the sleeve 11 is decompressed by suction by the vacuum suction system 2 (FIG. 2). .
The operation and effect of the sliding seal 70 and the seal member 79 will be described below for casting that performs vacuum suction in the sleeve 11 in this way.
In the present embodiment, the space 75 ahead of the front end 20 </ b> A of the plunger tip 20 and the inside of the suction recess 120 are sucked by the vacuum suction system 2. The suction inside the suction recess 120 is not necessarily a premise for obtaining the actions and effects described below.

When casting by 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 and the diameter is expanded. The diameter of the sliding seal 70 increases following the sleeve 11 due to thermal expansion and elastic force outward in the radial direction D2. The diameter of the seal member 79 also increases due to thermal expansion.
On the other hand, 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, although the diameter of the plunger tip 20 is also expanded by thermal expansion, the amount of deformation due to the thermal expansion of the plunger tip 20 is small compared to the sleeve 11 and the sliding seal 70 and the like.

From the above, it is assumed that 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 separated in the radial direction D2, and the gap Gp (FIG. 4B) is enlarged.
Still, since the seal member 79 is in an elastically deformed state and 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 maintained in a sealed state. .
In addition, in the present embodiment, the outside air is also prevented from being blown 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 behind, the rear end surface 701B of the region adjacent to the front side of the second gap 712 (front convex portion 701A) (FIG. Since a) and (b)) function as a wall that shields outside air, the outside air does not travel straight from the second gap 712 to the first gap 711. Therefore, resistance can be given to outside air and it can suppress that outside air passes the discontinuous part 71. FIG.

More specifically with respect to the discontinuous portion 71, the end surface 701B of the front convex portion 701A and the end surface 702B of the rear convex portion 702A that constitute the dividing portion 715 are abutted with no gap, so that the rear of the front convex portion 701A. It is possible to prevent the outside air that has collided with the end surface 701B (wall) from flowing into the first gap 711 through the space between the end surfaces 701B and 702B which are the divided portions 715.
Furthermore, since the dividing portion 715 is sealed from the inner side in the radial direction D2 by the seal member 79, the outside air that has flowed into the second gap 712 flows into the first gap 711 through the inner side in the radial direction D2. Can also be avoided.

Even if a part of the outside air blows through the slide seal 70 and the seal member 79 located upstream (rear side) of the outside air, another slide seal 70 and seal member located further downstream (front side) than that. 79 can prevent the outside air from being blown out.
When the plurality of sliding seals 70 are arranged side by side in the advance / retreat direction D1 as in this embodiment, the number of walls (701B) in the discontinuous portion 71 increases with respect to the flow of outside air from the rear to the front. Therefore, the effect of shielding the flow of outside air is improved.
Moreover, when the discontinuous portions 71 of the upstream sliding seal 70 and the downstream sliding seal 70 are separated in the circumferential direction D3, the outside air that has passed through the discontinuous portion 71 of the upstream sliding seal 70 is It does not go straight to the discontinuous portion 71 of the downstream sliding seal 70. Also in this respect, the effect of shielding the flow of outside air is improved.

According to the action of the sliding seal 70 and the sealing member 79 described above, the product between the outer peripheral portion 20C of the plunger tip 20 and the inner peripheral portion 11A of the sleeve 11 is continuously produced by casting. Both the outer side and the inner side in the radial direction D2 in the gap are sealed. Therefore, even if a pressure difference is generated between the inside of the sleeve 11 to be vented and the outside air, the outside air can be prevented from flowing in front of the sliding seal 70 and the seal member 79.
As a result, since the melt 18 is prevented from being violated, the inside of the sleeve 11 is decompressed to a desired degree of vacuum while avoiding blockage of the suction ports 14 to 17 and the suction path 51 and a decrease in suction efficiency due to the molten metal debris. Can prevent the occurrence of entrapment.

According to the present embodiment, the sliding seal 70 and the seal member 79 can improve the airtightness in the sleeve 11 and suppress the runaway of the molten metal 18. Therefore, it is not necessary to use an expensive plunger tip dedicated to high vacuum die casting in the injection apparatus 1 in order to improve the airtightness in the sleeve 11.
Further, since the gap that changes in the radial direction D2 due to the thermal expansion of the sleeve 11 or the like is maintained by the sliding seal 70 and the seal member 79, the thermal expansion coefficient of the ceramic material, cermet, or the like is increased. There is no need to employ an expensive sleeve 11 made of a small material.
As described above, it is possible to improve the quality of the cast product by suppressing the generation of the entrapment nest by vacuum suction in the sleeve 11 while suppressing the apparatus cost.
According to the present embodiment, conventionally, in the sleeve vacuum suction in which the suction hole and the path are likely to be blocked due to the molten metal debris, the sleeve 11 avoids the suction path being blocked and the suction efficiency is lowered. Stable suction can be realized. According to the present embodiment, since it is not necessary to perform vacuum suction while suppressing the degree of vacuum and the molten metal filling rate in the sleeve in order to avoid blockage of the path and the like, high-vacuum and high filling rate sleeve vacuum suction is realized. be able to.

(Modification of sliding seal)
The injection device 1 shown in FIG. 8A includes one sliding seal 70 and one seal member 79.
The injection device 1 illustrated in FIG. 8B includes three sliding seals 70 and two seal members 79. As shown in this example, the sealing members 79 do not necessarily have to be arranged inside the radial direction D2 of the sliding seal 70 for all the sliding seals 70. Of the sliding seals 70 arranged in the advancing / retreating direction D1, the seal member 79 is allowed to be disposed only on the sliding seal 70 that needs to be sealed inside the radial direction D2.
As shown in this example, the sliding seals 70 and the sealing members 79 do not necessarily have to be the same number.

As already described, the discontinuous portions 71 of the adjacent sliding seals 70 are preferably separated from each other in the circumferential direction D3 as shown in FIG. 8 (b). This is to prevent outside air from blowing through the discontinuous portion 71.

As shown in FIG. 8C, the discontinuous portion 71 may be formed in a staircase shape. The discontinuous portion 71 includes a first gap 711, a second gap 712, a third gap 713, a first divided portion 715, and a second divided portion 716. Each of the first divided portion 715 and the second divided portion 716 is sealed with a seal member 79 from the inside in the radial direction D2.

Further, as shown in FIG. 8D, the first to third gaps 711 to 713 are arranged between the one end portion 701 in which the concave portion 717 is formed and the other end portion 702 in which the convex portion 718 is formed. May be. 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 FIGS. 13A and 13B, the sliding seals 81 and 82 formed in an annular shape including the linear discontinuous portion 80 will be described. The step of sleeve vacuum suction by the injection device 6 having the configuration shown in FIGS. 13A and 13B will be described later with reference to FIGS. 14A to 14C.

The injection device 6 shown in FIG. 13A includes a first sliding seal 81 and a second sliding seal 82 that are adjacent to each other in the advance / retreat direction D1, and one seal member 79.
The discontinuous portions 80 of the adjacent first and second sliding seals 81 and 82 are linearly formed along the axial direction (D1). These discontinuous portions 80 are preferably shifted from each other in the circumferential direction D3. Here, the discontinuous portions 80 of the first and second sliding seals 81 and 82 are separated from each other by 180 °.
And the boundary 80B of the 1st, 2nd sliding seals 81 and 82 is sealed from the inner side of radial direction D2 with the sealing member 79, as shown in FIG.13 (b). In the example shown here, the outer end 79A of the seal member 79 is abutted against and closely contacts 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.
The discontinuous portion 80 of the second sliding seal 82 corresponds to the second gap 712 in the above embodiment.
A boundary 80B in the axial direction (D1) between the first sliding seal 81 and the second sliding seal 82 corresponds to the dividing portion 715 in the above embodiment.
Therefore, according to the configuration shown in FIGS. 13A and 13B, the sliding seals 81 and 82 by simple processing are used as compared with the sliding seal 70 of the above embodiment, but the same as in the above embodiment. The effect of preventing the outside air from flowing toward the front space 75 in the sleeve 11 can be obtained.

(Suppression of outside air flow by suction of suction recess)
In the present 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 is also performed from the inside of the suction recess 120 behind the front end 20A. The space 75 and the inside of the suction recess 120 are depressurized with respect to the atmospheric pressure.
In the present embodiment, the inside of the suction recess 120 is sucked through the suction ports 14 to 17. Not limited to this, for example, it is allowed to suck the inside of the suction recess 120 through a hole formed in the second large diameter portion 202 in the axial direction. 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 / retreat direction D1, the suction recess always passes through the axial hole from the start to the end of the sleeve vacuum suction. The inside of 120 can be aspirated.

According to the suction between the front space 75 and the inside of the suction recess 120, the space in the sleeve 11 that is equivalent in pressure to the front space 75 behind the front space 75 (inside the suction recess 120). Thus, outside air outside the sleeve 11 can be prevented from flowing into the front space 75 in the sleeve 11. Even if there is no difference between the pressure P1 inside the suction recess 120 and the pressure P2 in the space 75, or there is a pressure difference, the pressure difference (P1-P2) is the pressure in the atmospheric pressure P0 and the pressure in the front space 75. This is because the outside air is suppressed from flowing into the front space 75 through the inside of the suction recess 120 by being sufficiently smaller than the difference (P0−P2) from P2.

When the plunger 12 moves forward, if both the front space 75 and the inside of the suction recess 120 are continuously sucked, the inflow of outside air to the front space 75 storing the molten metal 18 is suppressed during the suction. can do. While the front space 75 is sucked, it is preferable that the inside of the suction recess 120 is sucked without interruption, so that the inflow of outside air into the front space 75 is always suppressed while the front space 75 is sucked.

In the present embodiment, based on the configuration of the vacuum suction system 2 (FIG. 2) described above, the suction inside the front space 75 and the suction recess 120 can be performed by one vacuum suction system 2. Both the gas sucked from the front space 75 and the gas sucked from the inside of the suction recess 120 are sucked by the same vacuum pump 37 through the same vacuum tank 36.
Therefore, compared with the case where a vacuum suction system is individually provided inside the front space 75 and the suction recess 120, the cost of the devices such as the vacuum pump 37 and the vacuum tank 36 can be reduced. In addition, since the number of vacuum suction systems is small, the number of inspection points for gas leakage (leakage) is small, so the inspection work efficiency is good.

However, the front space 75 and the inside of the suction recess 120 are allowed to be sucked through different systems.

The plunger tip 20 equipped with the sliding seal 70 and the seal member 79 described above is inserted into the sleeve 11 and sucked from the inside of the suction recess 120 in addition to the front space 75, thereby storing the melt 18. Inflow of outside air into the space 75 can be prevented more reliably.

In order to prevent the outside air from flowing into the front space 75 via the inside of the suction recess 120 based on the difference between the pressure P1 inside the suction recess 120 and the pressure P0 of the outside air, the first and second large It is preferable to provide the sliding seal 70 and the seal member 79 on at least the second large diameter portion 202 of the diameter portions 201 and 202.
From the viewpoint of preventing the outside air from flowing from the inside of the suction recess 120 into the front space 75 based on the difference (P1−P2) between the pressure P2 of the front space 75 and the pressure P1 inside the suction recess 120, A sliding seal 70 and a seal member 79 may be provided on the first large diameter portion 201.

(Continuous suction of front space and suction recess by multiple suction ports)
Next, continuous suction of the front space 75 and the inside of the suction recess 120 through the plurality of suction ports 14 to 17 will be described.
Suction is continuously performed from the front space 75 and the inside of the suction recess 120 for as long a period as possible from the beginning to the end of the injection process performed by moving the plunger 12 forward, and without interruption as much as possible. preferable. This is because the inflow of outside air to the front space 75 storing the molten metal 18 is suppressed, and the gas is stably and continuously sucked sufficiently from the front space 75.

For example, the plunger 12 moves forward from the backward limit position shown in FIG. 11A to a position where the foremost fourth suction port 17 is closed by the tip 20 as shown in FIG. 11F. In this case, the front end 20A of the plunger tip 20 passes through the positions of the suction ports 14 to 17 in the order of the first suction port 14, the second suction port 15, the third suction port 16, and the fourth suction port 17.

In the injection filling process in the present 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, and communicates with the inside of the suction recess 120. The inside of the suction recess 120 is sucked through at least one suction port.

When the plunger 12 moves forward as shown in FIGS. 11B to 11E, at least one of the suction ports 14 to 17 is selectively disposed in the front space according to the position of the plunger 12 that moves forward with respect to the sleeve 11. 75 and at least one of the suction ports 14 to 17 communicates with the inside of the suction recess 120.
According to such a configuration, the inside of the suction recess 120 is continuously sucked through the one or more suction ports communicating with the front space 75 and the inside of the suction recess 120 while the front space 75 is sucked. Thus, the inflow of outside air into the front space 75 can be suppressed.

Next, after describing each process of casting with reference to FIG. 9 and FIG. 10, vacuum suction in the sleeve 11 will be described based on a specific example shown in FIGS. 11 (a) to 11 (f).

(Casting method, control example of sleeve vacuum suction)
First, each process of casting is demonstrated with reference to FIG. 9 and FIG.
Hereinafter, the vacuum suction by the vacuum suction system 2 is referred to as “sleeve vacuum”.

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

If the sleeve vacuum process is not performed (No in step S11), the process proceeds in the order of pressure increase switching command, cooling (solidification), mold opening, product removal, product detection, mold spray, injection retreat, and chip lubrication. The next cycle starts (in the case of Yes in step S12).
On the other hand, when the sleeve vacuum is executed (Yes in step S11), the processing by the circuit A (FIG. 10) is performed, and the pressure increase switching command, cooling (solidification), mold opening, product removal, product detection, mold The process proceeds in the order of spray, reverse injection, and tip lubrication.
A part of the processing by the circuit A (FIG. 10) is performed before the step of the pressure increase switching command, and the rest is performed in parallel with the steps after the pressure increase switching command. In general, steps S101 to S113 can be performed before the step of increasing pressure switching command, and steps S114 to S118 can be performed in parallel with the steps after the pressure increasing switching command.

Hereinafter, processing by the circuit A as the control circuit will be described with reference to FIGS. 10 and 2. The processing by the circuit A is also performed under the control of the 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 each of the suction ports 14-17.
It is assumed that all the suction ports 14 to 17 are open at the start of the sleeve vacuum. After the start of the sleeve vacuum, the suction ports 14 to 17 are sequentially closed by the tip 20 of the plunger 12 which has 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 chip 20, the suction port is not in communication with the front space 75 or the inside of the suction recess 120. It cannot be used for a sleeve vacuum sucked from the inside of the recess 120. Although such a suction port is not in communication with the front space 75 and the inside of the suction recess 120, the pressure increase in the vacuum tank 36 is suppressed to maintain the suction efficiency, and molten metal enters the suction port. Therefore, it is preferable to close the corresponding selection valve 33 after it cannot be used.
Therefore, as described below, when the plunger 12 reaches the position closed by the second large diameter portion 202 of the plunger tip 20 for each of the suction ports 14 to 17 as the plunger 12 moves forward, the suction is performed. The selection valves 33 corresponding to the mouths 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 closed by the second large diameter portion 202 of the chip 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, the outside air is in the space 88. May flow into the vacuum tank 36 via the suction port 51 via the suction port. Since this is not intended, for example, in the step shown in FIG. 11 (d), the selection valve 33 corresponding to the suction port 14 closed by the chip 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 appropriately closed not only based on the unusability based on the closing of the suction ports but also based on the unusability of the suction path 51 and the like caused by the molten metal as described above. Alternatively, the selection valves 33 corresponding to the suction ports 14 to 17 can be opened and closed based on the manufacturing conditions according to the mold and product.

In step S101, it is confirmed that the inside of the vacuum tank 36 has reached a sufficient degree of vacuum, and a preparation completion signal is issued.
In step S102, after pouring, the plunger 12 moves forward and exceeds the position where the pouring port 13 is closed, and then the vacuum suction system 2 starts to pull the sleeve 11 into a vacuum. A predetermined position in the advance / retreat direction D1 of the plunger 12 can be determined as a vacuum start position at which vacuum suction is started. Detection of the arrival of the plunger 12 at the set vacuum start position is performed by detecting the stroke of the hydraulic cylinder that drives the plunger 12 with a non-contact sensor or the like. The arrival of the plunger 12 at 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 a set position (FIG. 2 / first suction port closing position) where the first suction port 14 is closed.
In step S105, the selection valve 33 corresponding to the first suction port 14 is closed.

In step S106, the plunger 12 reaches a set position (FIG. 2 / second suction port closing position) where the second suction port 15 is closed.
In step S107, the selection valve 33 corresponding to the second suction port 15 is closed.

In step S108, the plunger 12 reaches a set position (FIG. 2 / third suction port closing position) where the third suction port 16 is closed.
In step S109, the selection valve 33 corresponding to the third suction port 16 is closed.

In step S110, the plunger 12 reaches a setting position (FIG. 2 / fourth suction port closing position) where the fourth suction port 17 is closed. Here, immediately before the plunger 12 reaches the set position for closing the fourth suction port 17, the degree of vacuum of the suction path 51 corresponding to the fourth suction port 17 is measured using the pressure detection unit 32. The degree of vacuum of the fourth suction port 17 is managed by providing upper and lower limits. When the degree of vacuum is outside the set range, an alarm is issued by a lamp or buzzer. 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 turned off (neutral position).
In step S113, all the selection valves 33 of the suction ports 14 to 17 are opened.
In step S114, the vacuum / air blow switching valve 35 is switched to air blow.
In step S115, the air blow, which is a process of ejecting air into the sleeve 11 through the suction port, is performed using the pressurized tank 38 by the pressurized air supply system 9 that shares a part of the piping with the vacuum suction system 2. . At this time, all the selection valves 33 of the suction ports 14 to 17 may be opened, or the selection valves 33 may be opened one by one in order. When air blow is completed, the vacuum / air blow switching valve 35 is turned off (neutral position) (S118).
In step S116, the pressure of the suction passages 51 to 17 of the suction ports 14 to 17 is measured by the pressure detection unit 32 while air blow is being performed. Judgment is made. If clogging occurs, an alarm is issued by a lamp or buzzer (step S117).

Note that the timing of performing the air blow in step S115 is after the plunger 12 moves forward in the sleeve 11 and reaches the suction port 17 farthest away from the pouring port 13 during the casting cycle. It may be after vacuum suction in the sleeve 11 through the mouth is finished. For example, after the plunger 12 reaches the speed / pressure switching point described above, the cast product is securely held on the movable mold 22 side having the product pushing mechanism when the mold is opened. As described above, air blow may be performed at the forward limit position of the plunger 12 in the operation of pushing the plunger 12 in contact with the cast product via the biscuit portion to the forward limit position.
Also, when the operation mode is selected by operating a switch that switches the operation mode of the die casting machine (1 cycle automatic operation mode / full automatic operation mode at the start of casting) except during the casting cycle, The air blow in step S115 may be performed automatically.

This completes the description of the flowchart. Here, the sleeve 11 is evacuated by 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 16 and the second suction port Any combination of the four suction ports 17 or the second suction port 15, the third suction port 16, and the fourth suction port 17 may be used. There is no limit to the number of suction ports used.

The upper limit sleeve filling rate can be used for the control of opening and closing the selection valve 33 corresponding to each of the suction ports 14 to 17.
The “upper limit sleeve filling rate” is close to the cavity 23 from the suction port reached by the plunger 12 when the filling rate of the molten metal 18 in the sleeve 11 (referred to as sleeve filling rate) rises to a predetermined value (for example, 80%). This is the upper limit value of the sleeve filling rate when all the selection valves 33 belonging to the suction port are closed.
Using this “upper limit sleeve filling rate” means that when the sleeve filling rate reaches a predetermined value, all the selection valves 33 belonging to the suction port close to the cavity 23 from the suction port reached by the plunger 12 are closed. To do. Note that the upper limit sleeve filling rate can be freely set before casting.

The purpose of using the upper limit sleeve filling rate is to prevent the molten metal debris from entering the suction path 51 from the suction ports 14 to 17 at the time of evacuation because the sleeve filling rate is increased. This is because the sleeve 11 is evacuated by the maximum number of suction ports from which molten metal debris does not enter the suction path 51 from .about.17.

(Specific example of sleeve vacuum process)
Hereinafter, based on the specific example shown in FIGS. 11A to 11F, an example of a series of steps for performing continuous suction inside the front space 75 and the suction recess 120 through the plurality of suction ports 14-17. explain.

FIGS. 11A to 11F are diagrams for explaining a series of steps of sleeve vacuum. 11 (a) is a sleeve vacuum preparation step, FIG. 11 (b) is a sleeve vacuum start step, FIG. 11 (c) is a sleeve vacuum first step, FIG. 11 (d) is a sleeve vacuum second step, FIG. ) Shows a sleeve vacuum cavity side vacuum end step, and FIG. 11 (f) shows a sleeve vacuum end step. As the plunger 12 moves forward, the sleeve vacuum step proceeds in the order of (a), (b), (c), (d), (e), and (f) in FIG.

11A to 11F, the sliding seal 70, the seal member 79, and the seal holding member 72 are not shown. The same applies to FIGS. 12A to 12E.

Sleeve vacuum preparation steps:
In the sleeve vacuum preparation step shown in FIG. 11A, the plunger 12 is in a state of being stopped at the original position which is the position of the retreat limit. Since the pouring port 13 is opened, the molten metal 18 can be supplied from the pouring port 13 into the sleeve 11. At this time, the space 75 in front of the front end 20 </ b> A of the plunger tip 20 and the pouring port 13 communicate with each other.
The sleeve vacuum preparation step is a step for preparing to start the sleeve vacuum. At this time, vacuum suction is not performed for all of the suction ports 14 to 17.

When the plunger 12 advances from the state shown in FIG. 11A to a position where the front end 20A of the tip 20 exceeds the pouring gate 13 (a position indicated by a one-dot chain line in FIG. 11A), the first of the plunger tip 20 is moved. The pouring port 13 is closed by the large diameter portion 201, whereby the space 75 in front of the front end 20 </ b> A and the pouring port 13 are separated from each other by the chip 20.
Further, when the plunger 12 advances to a position where the front end of the second large diameter portion 202 exceeds the pouring port 13 (not shown), the pouring port 13 is closed by the second large diameter portion 202, so that suction is performed. The inside of the recess 120 for use and the pouring port 13 are separated by the chip 20.
After this position, while the plunger 12 moves forward (including FIGS. 11B to 11F), the front space 75 and the inside of the suction recess 120 are separated from the pouring port 13 by the tip 20. It is kept in a state where it is partitioned in the sleeve 11.
Thereafter, as shown in FIG. 11B, when the plunger 12 advances to a position where the inner side of the suction recess 120 communicates with the rearmost suction port 14, the suction recess 120 is moved into the front space 75. Since at least one suction port is in communication with each other, suction is possible from both the front space 75 in the sleeve 11 and the inside of the suction recess 120.

Therefore, the position (vacuum start position) of the plunger 12 when starting the sleeve vacuum is at least one suction port on each of the inside of the suction recess 120 and the front space 75 as shown in FIG. It is preferable to set the position of the plunger 12 when the is in communication. As soon as the plunger 12 reaches such a position, it is preferable to immediately start suction inside the front space 75 and the suction recess 120. As a result, a 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 start step:
In the sleeve vacuum start step shown in FIG. 11 (b), the sleeve vacuum is started through all the suction ports 14-17. In the sleeve vacuum start step, first, the plunger 12 starts to advance from the position of the retreat limit, and the end surface on the cavity 23 side of the second large diameter portion 202 passes through the pouring port 13. Next, the vacuum tank 36 evacuates the inside of the suction recess 120 and the front space 75 through all the suction ports 14 to 17 of the sleeve 11.

As shown in FIG. 11B, when the plunger 12 is in the vacuum start position, the first suction port 14 communicates with the inside of the suction recess 120, and the second to fourth suction ports are provided in the front space 75. 15 to 17 communicate.
Therefore, vacuum suction inside the suction recess 120 is performed through the first suction port 14, and at the same time or at different timings, the second suction port 15, the third suction port 16, and the fourth suction port 17. Through this, vacuum suction of the front space 75 can be performed.
At this time, the selection valves 33 corresponding to the second suction port 15, the third suction port 16, and the fourth suction port 17 may be opened at the same time, or may be opened at different timings.
In order to suppress the outside air outside the sleeve 11 from flowing into the front space 75 through the inside of the suction recess 120, the vacuum suction inside the suction recess 120 is performed prior to the start of the vacuum suction of the front space 75. It is preferable to start.

Sleeve vacuum first step:
In the sleeve vacuum first step shown in FIG. 11 (c), the plunger 12 further advances, and the inside of the suction recess 120 is in communication with the first suction port 14 and the second suction port 15. Further, the front space 75 communicates with the third suction port 16 and the fourth suction port 17.
Therefore, vacuum suction inside the suction recess 120 through the two suction ports (first suction port 14 and second suction port 15) and through the remaining suction ports (third suction port 16 and fourth suction port 17). Further, vacuum suction of the front space 75 can be performed.

Sleeve vacuum second step:
In the sleeve vacuum second step shown in FIG. 11 (d), the plunger 12 further advances, and the inside of the suction recess 120 is in communication with one suction port (second suction port 15). Further, the front space 75 communicates with the two suction ports (the third suction port 16 and the fourth suction port 17).
At this time, when the second large diameter portion 202 of the plunger tip 20 faces the first suction port 14, the first suction port 14 is closed and becomes unusable. Therefore, the selection valve 33 corresponding to the first suction port 14 is closed, and the decompression by the first suction port 14 is finished. Here, it is assumed that the selection valve 33 is closed when the first suction port 14 is closed by the second large diameter portion 202 of the chip 20 and is not in communication with the external space 88.
In FIGS. 11D to 11F, “blocking” is added to the suction port where the corresponding selection valve 33 is blocked.
Among the first to fourth suction ports 14 to 17, the remaining suction ports 15 to 17 whose corresponding selection valves 33 are not closed communicate with the front space 75 or the inside of the suction recess 120. Therefore, vacuum suction inside the suction recess 120 through one suction port (second suction port 15) and vacuum in the front space 75 through two suction ports (third suction port 16, fourth suction port 17). Aspiration can be performed.

As the plunger 12 advances, the sleeve vacuum first step shown in FIG. 11C and the sleeve vacuum second step shown in FIG. Progress.
That is, as the plunger 12 moves forward, vacuum suction inside the suction recess 120 through two suction ports (FIG. 11C) and vacuum suction inside the suction recess 120 through one suction port (FIG. 11). 11 (d)) are alternately repeated, and the vacuum suction of the front space 75 through the at least one suction port is continuously performed, and the selection valve 33 corresponding to the suction port that has become unusable is provided. It will be closed.

Sleeve vacuum cavity side vacuum end step:
Thereafter, as shown in FIG. 11E, when the plunger 12 has advanced to a position where the foremost fourth suction port 17 is closed by the tip 20, the suction of the front space 75 is terminated. The front space 75 is sucked through the fourth suction port 17 until just before the fourth suction port 17 is closed, and is sucked also from the inside of the suction recess 120.
As shown in FIG. 11 (e), when the plunger 12 moves forward to the position where the foremost fourth suction port 17 is closed by the first large diameter portion 201, the front space 75 has the first suction port 14 to the fourth suction port. It is in a state where it does not communicate with any of the mouths 17. In this state, the vacuum suction from the front space 75 and the inside of the suction recess 120 can be terminated (sleeve vacuum cavity side vacuum termination step). In this case, the selection valve 33 corresponding to the fourth suction port 17 and the selection valve 33 corresponding to the third suction port 16 at the position of the suction recess 120 may be closed.

The sleeve vacuum can be continued until the plunger 12 moves forward to the position shown in FIG. 11 (f) without ending the sleeve vacuum in the state shown in FIG. 11 (e). This will be described below.

As shown in FIG. 11E, the fourth suction port 17 is closed by the first large-diameter portion 201, so that no suction port communicates with the front space 75. The third suction port 16 communicates with the inside. That is, vacuum suction inside the suction recess 120 through the third suction port 16 can be performed. Even if there is no suction port that directly communicates with the front space 75, the front space 75 is connected to the fourth suction port 17 via a gap 89 that exists between the first large diameter portion 201 and the inner peripheral portion 11 </ b> A of the sleeve 11. Leads to. 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. 11E, the selection valve 33 corresponding to the fourth suction port 17 is not closed. While sucking the front space 75 through the fourth suction port 17 and the gap 89, the inside of the suction recess 120 can be sucked through the third suction port 16.

Thereafter, 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 75 and the inside of the suction recess 120 are connected through the fourth suction port 17. Vacuum suction can be performed.

Sleeve vacuum end step:
Further, as shown in FIG. 11 (f), when the plunger 12 moves forward to a position where the front end of the second large diameter portion 202 exceeds the fourth suction port 17, the suction recess 120 is moved by the inner wall of the sleeve 11. If closed, 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. The 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.

Note that the inside of the suction recess 120 may be sucked 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. If it does so, the front space 75 can also be attracted | sucked through the inner side of the recessed part 120 for suction, and it can implement by extending a sleeve vacuum.
However, before the suction port 17 communicates with the space 88 around the rod 19 by the advancement of the plunger 12, it is preferable to close the selection valve 33 corresponding to the suction port 17 to end the sleeve vacuum.

As can be understood from FIGS. 11 (a) to 11 (f) and the above description, when referring to the individual suction ports 14 to 17, any one of the suction ports 14 to 17 is selected at the beginning of the sleeve vacuum. The mouth (for example, the first suction port 14) communicates with the front space 75, and communicates with the front space 75 until it is closed by the first large-diameter portion 201 of the advanced plunger 12. Next, the suction port communicates with the inside of the suction recess 120 by the advancement of 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 plunger 12 that has advanced. After the arbitrary suction port is closed by the second large-diameter portion 202, the suction port does not communicate with the front space 75 or the inside of the suction recess 120, and therefore cannot be used for sleeve vacuum. The selection valve 33 to be closed is closed.

From the start of the sleeve vacuum shown in FIG. 11 (b) to the sleeve vacuum process from the start of the sleeve vacuum until just before the plunger 12 reaches the position shown in FIG. 11 (e), At least one suction port communicates with the front space 75 and at least one suction port communicates with the inside of the suction recess 120.
Then, the vacuum suction from the inside of the suction recess 120 can be continued until the vacuum suction from the front space 75 through the foremost suction port 17 is completed.
Therefore, after the sleeve vacuum is started by the 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 the seal member 79 described above, the final stage of the injection filling process is started. Thus, the suction in the sleeve 11 can be stably continued while preventing the molten metal 18 from being ramped up due to the inflow of outside air. Therefore, entrainment of gas into the molten metal 18 can be suppressed and the quality of the cast product can be improved.

Furthermore, as shown in FIG. 11E, if the sleeve vacuum suction is continued even after the foremost suction port 17 is closed by the first large diameter portion 201, the first large diameter portion 201 and the sleeve 11 are maintained. The front space 75 may be sucked using the gap 89 between the two. In that case, unlike the case where the sleeve vacuum is terminated in the state shown in FIG. 11E, the foremost suction port 17 is also used for suction inside the suction recess 120.
In this way, the suction in the sleeve 11 can be continuously performed from the start of the sleeve vacuum to the end as much as possible in the injection filling process.

As described 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 to the end of the vacuum suction, and the vacuum suction is simultaneously ended. By doing so, the inside of the suction recess 120 as a space having the same pressure as that of the front space 75 is surely always provided behind the front space 75 in which the molten metal 18 is stored during the sleeve vacuum suction. Therefore, it is preferable for suppressing the inflow of outside air.
However, even if the vacuum suction is interrupted to affect the pressure inside the front space 75 and the suction recess 120, the sliding seal 70 is provided between the outer peripheral portion 20C of the tip 20 of the plunger 12 and the inner peripheral portion 11A of the sleeve 11. Since the sealing member 79 seals the outside air, the outside air does not easily flow into the suction recess 120 or the front space 75.
Furthermore, if the vacuum suction is interrupted for a short period of time that does not affect the occurrence of the entrapment nest due to the stagnation of the molten metal 18 or the blockage of the suction port or the like by the molten metal debris, the sliding seal 70 or the seal It is allowed with or without the member 79.
In other words, as long as the sleeve vacuum suction is stably established by suppressing the inflow of outside air, either or both of the front space 75 and the inside of the suction recess 120 in a part from the start to the end of the sleeve vacuum suction. It is also permitted that the suction of the sleeve is interrupted, or the timing of the start and end of the sleeve vacuum suction between the front space 75 and the inside of the suction recess 120 is different.

(Modifications related to suction in both the front space and the inside of the suction recess, dimension conditions)
Next, with reference to FIGS. 12 (a) to 12 (e), regarding vacuum suction from both the front space 75 and the inside of the suction recess 120, the number of suction ports 14 to 17 and each part of the plunger tip 20 With respect to the dimensions and dimensions relating to the suction ports 14 to 17 and the pouring port 13 of the sleeve 11, a modification of the injection apparatus 1 will be described.
In any of the examples shown in FIGS. 12 (a) to 12 (e), at least one of the plurality of suction ports 14 to 17 is selectively provided, as in FIGS. 11 (b) to 11 (e). Since at least one of the suction ports 14 to 17 communicates with the front space 75 and communicates with the inside of the suction recess 120, both the front space 75 and the inside of the suction recess 120 are sucked forward. Inflow of outside air into the space 75 can be suppressed.
In the example shown in FIG. 12D, as will be described later, since the outside air flows into the suction recess 120, the effect of suppressing the inflow of outside air into the front space 75 is inferior to the other examples.

Let n be the number of suction ports 14-17. The number of suction ports 14 to 17 shown in FIGS. 12A to 12E is 4 (n = 4).
As shown in FIGS. 12A to 12C, when suctioning the front space 75 and the inside of the suction recess 120 through separate suction ports, n may be 2 or more.
As shown in FIG. 12E, when the front space 75 and the inside of the suction recess 120 are sucked through the same suction port, n may be 1 or more.

In the examples shown in FIGS. 12A to 12E, the dimensions and shapes of the suction ports in the advance / retreat direction D1 are the same.
Further, when there are three or more suction ports (n ≧ 3), the suction ports are arranged at equal intervals in the forward / backward direction D1.

The dimensions relating to each of the sleeve 11 and the plunger tip 20 are defined as follows.
Dimension relating to the sleeve Ls1: Distance in the forward / backward direction D1 from the pouring port 13 to the suction port 14 closest to the pouring port 13 (the rearmost) Ls2: Dimension in the forward / backward direction D1 of each of the suction ports 14 to 17 Ls3: Forward / backward direction Distance between suction ports adjacent to D1 and dimensions related to the plunger tip:
Lp0: dimension in the advancing / retreating direction D1 of the recess 120 for suction Lp1: dimension in the advancing / retreating direction D1 of the first large diameter part 201 Lp2: dimension in the advancing / retreating direction D1 of the second large diameter part 202

Note that Lp0 when the dimension of the advancing / retreating direction D1 at the inner end in the radial direction D2 and the dimension of the advancing / retreating direction D1 at the outer end of the radial direction D2 are different as in the suction recess 120 shown in FIG. It is assumed that the size is the dimension in the forward / backward direction D1 at the outer end. In this case, Lp1 and Lp2 are also the dimensions in the forward and backward direction D1 at the outer end in the radial direction D2.

In the example shown in FIGS. 11A to 11F described above, the number n of the suction ports 14 to 17 is four. In the example shown in FIGS. 11A to 11F, the dimensions of the respective portions 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 (mm)
Lp2 = 60 (mm)

If vacuum suction is performed between the front space 75 and the inside of the suction recess 120 through the suction ports 14 to 17, as described above, at least one of the suction ports 14 to 17 in the vacuum suction process. One communicates with the inside of the suction recess 120, and at least one of the suction ports 14 to 17 also needs to communicate with the front space 75 (condition 1).
Here, not only when the front space 75 and the inside of the suction recess 120 are vacuum-sucked while the plunger 12 is continuously advanced during injection filling, the front space 75 and the suction space are stopped in a state where the advancement of the plunger 12 is temporarily stopped. It is assumed that the inside of the recess 120 is vacuumed.
The maximum value (upper limit) of Lp1 that meets the above condition 1 is expressed by the following equation (1) based on the example shown in FIG.
Lp1 <n × Ls2 + (n−1) × Ls3 (1)

In order to form the suction recess 120 in the chip 20, it is only necessary that the first large diameter part 201 exists in the chip 20 even if the length of the first large diameter part 201 is very 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

Assuming that the suction recess 120 is present, the above equation (1) relating to Lp1 is directly sucked through the suction ports 14 to 17 from both the front space 75 and the inside of the suction recess 120 ( This is an indispensable requirement for realizing Condition 1).
Hereinafter, as additional requirements for realizing Condition 1, equations relating to Lp0 and Lp2 will be shown.
First, Lp0 that is the dimension in the advancing / retreating direction D1 of the suction recess 120 will be described.
In order to perform 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 first example is shown in FIG. When the pouring port 13 is closed by the front end of the two large diameter portions 202, the suction port 17 closest to the cavity 23 and the front space 75 need to communicate with each other.
Then, the following expression (3) is derived by comparing the dimensions of the respective parts of the plunger tip 20 and the dimensions of the respective parts of the sleeve 11.
Lp0 + Lp1 <Ls1 + n × Ls2 + (n−1) × Ls3 (3)
From Equation (3), the maximum value (upper limit) of Lp0 that meets Condition 1 is expressed by the following Equation (4). Note that Lp0 is maximized when Lp1 is minimal (when it is close to 0 as much as possible).
Lp0 <Ls1 + n × Ls2 + (n−1) × Ls3-Lp1 (4)

Here, Equation (4) is based on the premise that the pouring gate 13 is closed by the front end of the second large diameter portion 202. If it is taken into account that the pouring gate 13 is closed by a member other than the plunger 12, for example, a member inserted from behind in the sleeve 11, Lp0 is not limited to the equation (4).

After the vacuum suction inside the front space 75 and the suction recess 120 is started at the position of the plunger 12 shown in FIG. 12B, the plunger 12 is stopped and the front space 75 and the suction recess 120 inside. It is possible to perform vacuum suction. Thereafter, the vacuum suction inside the front space 75 and the suction recess 120 can be continued until the plunger 12 is advanced and the suction port 17 is closed by the first large diameter portion 201.

The minimum value of Lp0 can be set based on the following condition 2.
While the plunger 12 moves forward, both the front space 75 and the inside of the suction recess 120 are sucked through the suction holes (condition 2).
As understood from the example shown in FIG. 12C, the minimum value (lower limit) of Lp0 that meets the above condition 2 is expressed by the following equation (5).
Lp0> Ls3 (5)
That is, the dimension Lp0 of the suction recess 120 is larger than the dimension Ls3 of the interval between the adjacent suction ports 14-17. For this reason, for example, as in the example shown in FIG. 12C, the rear side in the axial direction of the suction recess 120 communicates with the suction port 14, and the front side in the axial direction of the suction recess 120 communicates with the suction port 15. . Then, at least one suction port always communicates with the inside of the suction recess 120 regardless of the position of the plunger tip 20 in the axial direction with respect to the section where the suction ports 14 to 17 of the sleeve 11 are arranged. . Therefore, Condition 2 is met.

If Formula (5) is established in addition to Formula (1) above, as already described with reference to FIGS. 11 (a) to (f), when there are three or more suction ports, (N> 2) As the plunger 12 moves forward, vacuum suction (FIG. 11 (c)) inside the suction recess 120 through the two suction ports and inner side of the suction recess 120 through one suction port Vacuum suction (FIG. 11 (d)) 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 sucked through the suction holes.
Note that when n = 2 as in the second embodiment described below, both the front space 75 and the inside of the suction recess 120 are continuously sucked regardless of the requirements shown in Equation (5). Is possible.

Next, Lp2, which is the dimension of the second large diameter portion 202 in the advance / retreat direction D1, can be set based on the following condition 3.
The outside air is prevented from flowing into 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 (condition 3). This will be described with reference to FIGS. 12D and 12E.

In FIG. 12D, as indicated by an arrow, outside air from the rear side of the second large diameter portion 202 flows into the inside of the suction recess 120 through the suction port 14. not filled. At this time, it is difficult to reduce the pressure inside the suction recess 120 to the same level as the front space 75.

On the other hand, in FIG. 12E, since the suction port 14 is closed by the second large diameter portion 202 behind the suction concave portion 120, the space 88 and the suction concave portion behind the second large diameter portion 202 are closed. The inside of 120 does not communicate with the suction port 14. Therefore, since outside air is prevented from flowing into the inside of the suction recess 120 from behind the second large-diameter portion 202, the above condition 3 is satisfied.
As can be understood from the example shown in FIG. 12E, the minimum value (lower limit) of Lp2 that satisfies the condition 3 is expressed by the following equation (6).
Lp2 ≧ Ls2 (6)

Formula (6) corresponds to a requirement that is substantially necessary for reliably performing the sleeve vacuum suction while suppressing the inflow of the outside air into the front space 75.

[Second Embodiment]
Next, an injection device 6 for a die casting machine according to a second embodiment of the present invention will be described with reference to FIGS.
Hereinafter, a description will be given focusing on matters that are different from the first embodiment. The same code | symbol is attached | subjected to the structure similar to 1st Embodiment.

The injection device 6 according to the second embodiment includes a sleeve 11 in which two suction ports 14 and 15 that are separated in the advance / retreat direction D1 of the plunger 12 are formed, two sliding seals 81 and 82, and one seal member 79. And a provided plunger 12. The number n of suction ports is 2 (n = 2).
The sliding seals 81 and 82 and the seal member 79 are provided on the second large diameter portion 202 of the plunger tip 20. The configurations of the sliding seals 81 and 82 and the seal member 79 are as already described with reference to FIGS.

The requirements regarding the dimensions of each part of the plunger tip 20 and the sleeve 11 described with reference to FIGS. 12A to 12E are the injections shown in FIGS. 13 and 14, except for the equation (5) regarding the lower limit of Lp0. The same holds true for the device 6.

Hereinafter, the process of sleeve vacuum suction in the second embodiment will be described with reference to FIGS. 14 (a) to (c).
As shown in FIG. 14 (a), when the front end of the second large-diameter portion 202 passes through and closes the pouring port 13, and the inside of the suction recess 120 and the suction port 14 communicate with each other, the sleeve vacuum suction is started. It is preferable to do.
At this time, both the front space 75 and the inside of the suction recess 120 are partitioned in the sleeve 11 by the tip 20 so as not to communicate with the pouring port 13. Further, the second suction port 15 communicates with the front space 75, and the first suction port 14 communicates with the inside of the suction recess 120.
Therefore, as indicated by the solid arrow in FIG. 14A, the vacuum can be sucked from the front space 75 through the second suction port 15 by the vacuum suction system 2 (FIG. 2), and the broken arrow in FIG. As can be seen, the vacuum suction system 2 can suck from the inside of the suction recess 120 through the first suction port 14.

After that, the front space 75 and the suction recess 120 are closed until the second suction port 15 is closed by the first large-diameter portion 201 of the tip 20 of the plunger 12 that has advanced, as shown in FIG. Vacuum suction from both inside and outside can be continued.

As shown in FIG. 14B, 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. 14C). The front space 75 can be sucked from the second suction port 15 through the first suction port 14, and the inside of the suction recess 120 can also be sucked from the first suction port 14 through the gap 90. Even after the suction from the front space 75 is completed, the inflow of outside air into the front space 75 can be continuously suppressed by suction from the inside of the suction recess 120.

When n> 2 as in the example shown in FIG. 11 or FIG. 12 described above, for example, the state shown in FIGS. 11C and 11D is alternately repeated as the plunger 12 advances, that is, the suction recess. The inside of the front space 75 and the suction recess 120 may be continuously sucked while sequentially switching the suction ports communicating with the inside of the 120. However, this is not necessary in the second embodiment where n = 2.

In the second embodiment, at least until immediately before the second suction port 15 is closed, as shown by a dashed arrow in FIG. 14B, the first suction communicates directly with the inside of the suction recess 120. It is sufficient that the suction can be continued from the inside of the suction recess 120 through the mouth 14.
As shown in FIG. 14B, if the second suction port 15 is closed by the first large diameter portion 201, at least vacuum suction performed through the second suction port 15 directly communicating with the front space 75. Ends. In the state shown in FIG. 14B or FIG. 14C, the inside of the suction recess 120 does not necessarily need to communicate with the second suction recess 15. When n = 2 as in the second embodiment, it continues while the front space 75 is sucked regardless of the requirement shown in the above formula (5) regarding the lower limit of the dimension Lp0 of the suction recess 120. Thus, the inside of the suction recess 120 can be sucked directly from the suction port 14. Therefore, in the second embodiment, unlike Expression (5), Lp0 ≦ Ls3.

If Lp0 ≦ Ls3, the illustration is omitted, but when 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, The absence of a suction port that communicates with the inside of the suction recess 120 may interrupt the vacuum suction inside the suction recess 120. Even if the molten metal 18 is violated at this time, since n = 2, there is no opened suction port in addition to the suction ports 14 and 15, so there is no concern that at least the suction port is blocked by the scattering of the molten metal 18. .

In the second embodiment, through the second suction port 15 that communicates with the front space 75, the first suction port 14 that communicates with the inside of the suction recess 120 immediately before the end of the direct vacuum suction of the front space 75 is used. In order to realize that the direct vacuum suction inside the recess 120 is continued, as described above, the requirement shown in the equation (1) regarding the upper limit of Lp1 is essential. And regarding the upper limit of Lp0, it is preferable to follow the requirements shown in Formula (4) mentioned above, and it is preferable to follow the requirements shown in Formula (6) mentioned above about the lower limit of Lp2.

[Injection device with sealing material supply device]
Next, an injection device 6A according to an embodiment of the present invention will be described with reference to FIG.
The injection device 6A shown in FIG. 15 includes a sealing agent supply device 60 in order to interpose the sealing agent 61 between the inner peripheral portion of the sleeve 11 and the outer peripheral portion of the plunger tip 20.
The injection device 6A preferably includes the above-described sliding seal 70 and seal member 79 (FIG. 4).

The sealing agent supply device 60 is configured to be able to supply the sealing agent 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 in the plunger tip 20.
As the sealant 61, for example, a lubricant used for lubricating the plunger tip 20 can be used. In general, the higher the viscosity of the sealant 61, the better the sealability. However, if the viscosity is too high, it is difficult to sufficiently spread the sealant 61 to a necessary region due to a decrease in fluidity. Therefore, it is preferable to use a sealing agent 61 having an appropriate viscosity in consideration of sealing properties and fluidity. As the sealant supply device 60, a known plunger lubricant supply device can be used.

The sealant supply device 60 includes a container 62 for storing the sealant 61, a first pipe 631 and a second pipe 632 connected to the container 62, and a valve (not shown) for supplying the sealant 61 in a timely manner. I have. It is preferable that the valve of the sealant supply device 60 is automatically opened and closed or the opening degree is adjusted by the control device 3 (FIG. 1) or the like. If such valves are individually provided in the first pipe 631 and the second pipe 632, the sealing agent 61 can be individually supplied to the first large diameter part 201 and the second large diameter part 202. It is also permitted to supply the sealing agent 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 the first pipe 631 and the second pipe 632 may be branched from one pipe connected to the container 62.

15, when the plunger 12 is in the retreat limit position as indicated by a solid line, the front end side of the plunger tip 20 is inserted into the sleeve 11. At this time, the sealing agent 61 is supplied to the outer peripheral portion of the first large-diameter portion 201 located in the sleeve 11 through the first pipe 631, and the outer peripheral portion of the second large-diameter portion 202 located outside the sleeve 11 is The sealing agent 61 can be supplied through the second pipe 632.

When the plunger tip 20 moves forward as indicated by a broken line in FIG. 15, the sealing agent 61 is spread and filled in the gap 89 between the outer peripheral portion of the first large diameter portion 201 and the inner peripheral portion of the sleeve 11. 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 sealing agent 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 vacuumed. At that time, the sealing agent 61 present in the gap 90 suppresses the outside air from flowing into the suction recess 120, which is a negative pressure, through the space 88, while keeping the pressure inside the suction recess 120 low, Even if there is a pressure difference between the inside of the suction recess 120 and the front space 75 due to the sealing agent 61 present in the gap 89, the outside air flows into the front space 75 via the inside of the suction recess 120. Can be suppressed.

In the example shown in FIG. 15, the end portion of the first pipe 631 is inserted into a sealant pipe hole 11 </ b> D 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 sealant pipe hole 11D is close to the outer peripheral part of the first large diameter part 201 of the plunger tip 20 at the retreat limit position, the sealant 61 is discharged from the outlet 631A. It is reliably supplied to the outer peripheral portion of the first large diameter portion 201.
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. Also from the outlet 632A, the sealing agent 61 is reliably supplied to the outer peripheral portion of the second large diameter portion 202.

When the two pipes 631 and 632 are used as in the example illustrated in FIG. 15, the sealing agent 61 is reliably supplied to desired positions in the outer peripheral portions of the first large diameter portion 201 and the second large diameter portion 202. In addition, the supply of the sealing agent 61 to the first and second large diameter portions 201 and 202 can be performed simultaneously or in parallel by the two pipes 631 and 632, so that the step of supplying the sealing agent can be performed quickly. Can finish.

As long as the sealing agent 61 is interposed between the inner peripheral portion of the sleeve 11 and the outer peripheral portion of the chip 20 and the gap can be sealed, the sealing agent supply device 60 is appropriately configured, and the plunger 12 The sealing agent 61 can be supplied to the outer peripheral portion of the chip 20 at an appropriate timing, not only when it is in the retreat limit position. The supply of the sealing agent 61 to the first large diameter portion 201 and the supply of the sealing agent 61 to the second large diameter portion 202 may be performed at the same timing, or may be performed at different timings.

When, for example, about half of the axial direction of the first large-diameter portion 201 is exposed outside the sleeve 11 when the plunger 12 is in the retreat limit position, the end portion of the first pipe 631 is connected to the second pipe 632. Similarly to the above, it may be located outside the sleeve 11.

When the sealing agent 61 is supplied to the outer periphery of the second large diameter portion 202 when the second large diameter portion 202 is inserted into the sleeve 11, the end of the second piping 632 is the same as the first piping 631. The part can be arranged inside the hole formed in the sleeve 11.

It is not always necessary for the sealing agent supply device 60 to have the two pipes 631 and 632. Even if the sealant supply device 60 has only one pipe 631 connected to the container 62, the sealant 61 is applied to the outer peripheral portion of the second large diameter portion 202 through the pipe 631 by the advancement of the chip 20. It can be supplied.

[Third Embodiment]
Next, a third embodiment of the present invention and its modification will be described with reference to FIGS. A third embodiment, a modification of the third embodiment, and a fourth embodiment to be described next relate to measures for blocking the suction path 51. Such a countermeasure against blockage can be applied to the die casting machine 100 including the injection devices 1 and 6 and the injection device 1 or 6 of the first and second embodiments.

The configuration disclosed in the third embodiment, the modified example of the third embodiment, and the fourth embodiment is also applied to an injection device including a plunger including a tip in which the suction recess 120 is not partitioned and a sleeve. be able to.

3rd Embodiment shows the structure regarding the die-casting machine provided with the suction path 51 (FIG. 2) which vacuum-sucks the inside of the space formed in communication from the internal space of the sleeve 11 to the cavity 23. FIG. Here, the suction path 51 for sucking the internal space of the sleeve 11 from each of the suction ports 14 to 17 which are a plurality of holes in the sleeve 11 will be described.
However, the suction path 51 is connected to other holes and openings provided in the sleeve 11 as long as the inside of the space communicating from the internal space of the sleeve 11 to the cavity 23 can be vacuum-sucked. Or a passage provided in the plunger 12, for example, a passage extending in the axial direction from the tip 20 toward the rear end of the plunger 12. As described above, the third embodiment, the modified example of the third embodiment, and the fourth embodiment are also applicable to the injection apparatus including the chip 20 in which the suction recess 120 is not partitioned. The suction path 51 may be connected to a suction port formed only in one sleeve.
The suction path 51 is not limited to the one connected to the hole or opening of the sleeve 11 or the plunger 12 of the injection device, but is connected to the connection port 28 (FIG. 2) provided at one place or a plurality of places of the mold. It may be.
The above description regarding the suction path 51 is the same for the fifth embodiment and the modified example of the fifth embodiment.
A suction path for sucking the inside of the cavity 23 will be described later with reference to FIG.

FIG. 16 shows a collection structure 130 provided in the course of a 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 and collects the molten scum S or the like 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.
By collecting the molten scum S and the like by the collection structure 130, the suction efficiency is reduced and the suction path 51 is prevented from being blocked by the stagnation of the molten scum S and the like in the suction path 51.

When the vacuum suction system 2 includes the vacuum filter 31 (FIG. 2), the collection structure 130 is provided on the upstream side of the vacuum filter 31 in the flow of gas sucked through the suction path 51. In that case, the trapping structure 130 prevents the vacuum filter 31 from being clogged.
However, the vacuum filter 31 can be omitted from the vacuum suction system 2 by using the collection structure 130 of the present embodiment.

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 the suction ports 15 to 17. Of the suction paths 51 corresponding to each of the suction ports 14 to 17, the collecting structure 130 can be provided only in at least one suction path 51 that is particularly easily blocked by the molten metal debris S or the like.

The collection structure 130 includes a first section 131 that is a part of the suction path 51, a second section 132 that is a part of the suction path 51, a section connection part 133, and a collection part 134.
The collection unit 134 is connected to the suction path 51 and receives molten metal droplets S or molten metal debris S that is a solidified piece. The gas sucked from the inside of the sleeve 11 may contain foreign matters such as dust, and excess oily or water-soluble lubricant used for lubricating the plunger tip 20 in addition to the molten metal S. In addition to the molten metal debris S, foreign matter such as dust, and excess oily or water-soluble release agent can be mixed in the gas sucked from the cavity 23. The collection unit 134 receives and holds the molten metal S, foreign matter, lubricant, mold release agent, or the like, which has a large weight and density with respect to the gas. In the present specification, the molten residue S, foreign matter, lubricant, mold release agent, and the like are referred to as “molten residue”.

In the example shown in FIG. 16, the collection part 134 is formed in a cylindrical shape integrally with the section connection part 133, but this is not restrictive. The collection part 134 and the area connection part 133 are separate bodies, and may be joined. Moreover, the collection part 134 may be in an appropriate shape as long as it can collect the molten metal debris S separated from the gas and keep it inside, for example, in a box shape having a rectangular cross section. Can be formed. The section connection portion 133 is not limited to a cylindrical shape, and may have an appropriate shape.

In consideration of an assumed amount of mixture of the molten scum S and the like and a cleaning frequency of the collecting unit 134, an appropriate distance is secured between the accumulated molten scum S and the inlet 132A of the second section 132. An appropriate volume can be given to the collection part 134 so that it can do.

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

The region 51A can be configured by assembling a plurality of pipes. In order to avoid the molten scum S or the like from staying on the inner wall of the pipe, it is preferable to use a pipe having a smooth inner wall in the region 51A.

The piping of the suction path 51 is appropriately routed according to the space allowed for installation of the piping, the position of a support that supports the piping, or the like, or in order to avoid interference between the piping. Therefore, the region 51A may be curved in a more complicated shape than the illustrated inverted U shape.

The section connection part 133 surrounds the first section 131 from the outside, reaches the collecting section 134 beyond the outlet 131A at the lower end of the first section 131 downward. The section connection part 133 is sufficient if it surrounds at least the vicinity of the lower end of the first section 131.
Appropriate for each of the first section 131 and the section connecting portion 133 in consideration of 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 connecting portion 133. Can provide a large diameter.

The axis of the section connection part 133 and the axis of the first section 131 arranged inside the section connection part 133 do not necessarily have to coincide with each other. For example, the first section 131 may be eccentric to the left side in FIG. In this case, between the inner wall 133A and the side wall 131B 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 section 133 shown in FIG. Is wide.

The second section 132 is continuous with the section connecting section 133 at a position where the first section 131 is surrounded by the section connecting section 133. In the example illustrated in FIG. 16, the second section 132 is formed integrally with the section connection portion 133 and the collection portion 134, but is not limited thereto.
An inlet 132 </ b> A of the second section 132 is opened in the inner peripheral portion of the section connection section 133. The inflow port 132A faces the side wall 131B of the first section 131.

The first section 131 and the second section 132 communicate with each other via the inside of the section connecting portion 133, and form a flow path 130F for the sucked gas. The first section 131 extends in the vertical direction (vertical direction), and the second section 132 opens in the horizontal direction on the inner wall 133A of the section connecting portion 133. The gas flow that flows downward from the first section 131 turns inside the section connection portion 133 and flows into the second section 132 that is continuous with the inner wall 133A of the section connection section 133. Therefore, a curved flow path 130 </ b> F is formed over the first section 131, the section connecting portion 133, and the second section 132. The flow of gas flowing through the flow path 130F is schematically shown by arrows in FIG.

Note that the second section 132 may be arranged at a position indicated by a two-dot chain line so that the gas flowing out of the first section 131 turns toward the left side of FIG. Also in this case, the same effect as that by the collection structure 130 of the present embodiment can be obtained.

Also, the first section 131 may be inclined with respect to the vertical direction, or the inlet 132A of the second section 132 may be opened in a direction inclined with respect to the horizontal direction on the inner wall 133A of the section connecting portion 133. Is also acceptable. 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. However, the second section 132 is not necessarily limited to this, and the second section 132 extends in an arbitrary direction from the connection portion with the section connection portion 133. Good.

The height H1 of the outlet 131A of the first section 131 is preferably equal to or less than the height H2 of the inlet 132A (opening) of the second section 132, which is a connection portion between the section connecting portion 133 and the second section 132. (H1 ≦ H2, L ≧ 0). H1 and H2 are 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, it is preferable that the first section 131 extends to the position of the lower end of the inlet 132A of the second section 132 or extends below the position of the lower end of the inlet 132A.
The flow path 130 </ b> F flows downward from the outlet 131 </ b> A of the first section 131, then flows upward from the outlet 131 </ b> A inside the section connection portion 133, and further radially outward with respect to the axis of the first section 131. 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 that extends downward toward the collecting portion 134;
(2) Molten waste box (section connection portion 133 and collection portion 134) communicating with the first section 131;
(3) a second section 132 formed to communicate with the internal space of the molten metal box,
It has.
Furthermore, in the collection structure 130, the height H1 of the outlet 131A of the first section 131 is preferably equal to or less than the height H2 of the connection point (the inlet 132A) between the section connecting portion 133 and the second section 132. . Specifically, the distance L corresponding to the difference between the height H1 and the height H2 satisfies the relationship of the following formula (7).
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 (12 o'clock position) and the lower end of the opening of the inlet 132A within the projection range R1. Both (6 o'clock position) will exist.

The effect | action by the collection structure 130 is demonstrated. Due to the evacuation, the molten metal S or the like sucked into the suction path 51 together with the gas from the sleeve 11 through the suction port 14 (or 15 to 17) flows through the first section 131 toward the collecting unit 134.
When the gas flows out from the first section 131 by evacuation, the gas turns inside the section connection portion 133 and is sucked toward the second section 132. The gas is separated from the gas by moving substantially straight downward from the lower end of the first section 131 along the extending direction of the first section 131. Molten waste S or the like separated from the gas flow flowing into the second section 132 is captured by the collection unit 134. Molten waste S or the like falls in the internal space of the collection unit 134 and accumulates at the bottom of the collection unit 134.

In addition to the inertial force, the molten metal residue S or the like mixed in the gas is also separated from the gas by the centrifugal force. That is, due to the centrifugal force acting on the gas flowing out from the first section 131 and turning toward the second section 132, the gas and the molten scum S are separated based on the difference in density between the gas and the molten scum S. The
Here, the first section 131 and the second section 132 are not in direct communication with each other, but are in communication with each other via a section connecting portion 133 that surrounds the first section 131. In addition, the second section 132 is connected to the section connecting section 133 at a position where the first section 131 is surrounded by the section connecting section 133. Therefore, the side wall 131B of the first section 131 exists in the projection range R1 (FIG. 17A) of the inlet 132A of the second section 132 with respect to the first section 131.
The said structure is expanded and shown to Fig.17 (a).

According to the above configuration, the gas flows directly from the first section 131 to the second section 132 by the side wall 131B while securing a path for vacuum suction from the first section 131 to the second section 132. Can be prevented.
Here, as shown in FIG. 17B as another example, even when the gas directly flows from the first section 131 to the second section 132, the molten metal separated from the gas by inertial force and centrifugal force. It has been confirmed by tests that S and the like are generally collected.
Note that the second section 132 is arranged at the position indicated by the two-dot chain line, and the gas flowing out from the first section 131 turns toward the right side even when turning toward the left side in FIG. It showed the same collection efficiency.
In the present embodiment, as shown in FIG. 17A, the second section 132 is connected to the section connecting portion 133 that surrounds the first section 131. According to this embodiment, compared with the case where gas flows directly into the 2nd area 132 from the 1st area 131, collection efficiency, such as the molten metal debris S, is high, and it goes to the 2nd area 132, such as the molten metal debris S. Tests have also confirmed that the effect of regulating the inflow of water is high.

Referring to FIG. 17 (a) and FIG. 17 (b) which is another example, the operation of the collection structure 130 of this embodiment will be described. In the example shown in FIG. 17B, 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 in the projection area of the inflow port 132A.

In the present embodiment (FIG. 17A), since the first section 131 is longer than the example shown in FIG. 17B, the first section 131 is within the projection range R1 of the inlet 132A of the second section 132. Since the side wall 131 </ b> B exists, the gas flowing out from the first section 131 flows around the outer periphery of the first section 131 and then flows into the second section 132.
On the other hand, in the example shown in FIG. 17B, the gas flowing out from the first section 131 flows directly into the second section 132. This is the same as the case where the first section 131 does not exist inside the section connection unit 133.

According to the present embodiment, based on the arrangement of the outlet 131A of the first section 131 surrounded by the section connecting portion 133 and the inlet 132A of the second section 132 opened to the inner wall 133A of the section connecting portion 133, As shown in FIG. 17A, the air current bends at a plurality of locations from the outlet 131A to the inlet 132A. Specifically, the airflow is bent from the outlet 131 </ b> A to the outer periphery of the first section 131, and turns toward the second section 132 while being partially blown to the side wall 131 </ b> B of the first section 131. In this process, the airflow collides with the vicinity of the lower end of the first section 131 and the peripheral edge of the inlet 132A of the second section 132.
Then, while obtaining the separation effect of the molten scum S or the like from the gas due to inertial force and centrifugal force at each bent portion, the vicinity of the lower end portion of the first section 131 and the peripheral portion of the inlet 132A of the second section 132 are obtained. It is also possible to obtain an effect of separating the molten metal S and the like due to the collision of the airflow.

In the present 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 gas flowing out from the outlet 131A flows into the side wall 131B. The gas from which the molten metal residue S or the like is sufficiently separated flows into the second section 132 in the process of going around the outer periphery of the steel and reaching the inlet 132A. Therefore, it is possible to prevent the molten scum S and the like from flowing out toward the vacuum filter 31 and the selection valve 33 through the second section 132 and to promote the collection of the molten scum S and the like by the collecting unit 134.

As described above, according to the present embodiment, compared to the example illustrated in FIG. 17B, the molten residue S or the like is more sufficiently separated from the sucked gas and collected in the collection unit 134. Since the outflow of the molten metal S or the like to the section 132 can be prevented, it is possible to prevent the suction efficiency of the suction path 51 from being lowered and blocked.
Therefore, even if a pipe having a smooth inner wall is used in the first section 131 in order to prevent the stay of molten metal S or the like, it is installed in the second section 132 and the pipe closer to the vacuum tank 36 than that. It becomes possible to use a bellows-like pipe (bellows pipe) having a high degree of freedom.
In addition, use of a bellows-like pipe for the region 51A is allowed.

The collection part 134 shall be cleaned regularly and the molten metal residue S etc. which accumulated in the inside shall be removed. Thereby, since the amount of the molten waste S or the like sucked into the second section 132 can be reduced, the cleaning frequency of the vacuum filter 31 can be lowered when the vacuum filter 31 is used, and the suction path 51 Stable operation can be performed while suppressing a reduction in suction efficiency.
The smaller the volume of the collection part 134 is, the smaller the amount of suction air is, so that the efficiency of vacuum suction is improved, which is advantageous for the degree of vacuum. However, if the volume of the collection unit 134 is too small, the frequency of cleaning of the collection unit 134 increases. Therefore, the volume of the collection unit 134 may be appropriately determined in consideration of the degree of vacuum and the cleaning frequency.

As shown in FIGS. 16 and 17A, the height H1 of the outlet 131A in the first section 131 is preferably equal to or lower than the height H2 of the inlet 132A in the second section 132 (H1 ≦ H2). Then, the gas flowing out from the first section 131 flows around the outer periphery of the side wall 131B as a whole and flows into the second section 132 while colliding with the lower end of the first section 131 and the peripheral edge of the inflow port 132A. To do. Therefore, the molten scum S or the like mixed in the gas is separated and collected from the gas until the molten scum S or the like mixed in the gas reaches the inlet 132A from the outlet 131A. By suppressing the inflow, the effect of preventing the suction efficiency of the suction path 51 from being lowered and blocked is high.

Here, as H2-H1 (distance L) is larger, the inflow of the molten waste S or the like into the second section 132 can be effectively prevented. The difference between the heights H1 and H2 is the separation and collection efficiency from the gas such as the molten metal S and the pressure loss applied to the airflow by the vicinity of the lower end of the first section 131 and the peripheral edge of the inlet 132A. It can be determined as appropriate in consideration.
The distance L can be set to 5 mm as an example. When a test of vacuum suction in the sleeve 11 was performed using a distance L = 5 mm in an actual die casting machine, the molten metal S or the like was collected in the collection unit 134 and hardly flowed into the second section 132. Therefore, the vacuum filter 31 can be omitted from the vacuum suction system 2. According to the test, there is no adhesion of the molten metal S or the like on 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, if the side wall 131B of the first section 131 exists in the projection range R1 of the inflow port 132A, At least a part of the gas flowing out of the first section 131 wraps around the outer periphery of the first section 131 inside the section connecting portion 133 surrounding the first section 131 and flows into the second section 132. By sufficiently separating and collecting the molten scum S or the like from the flow, it is possible to prevent the molten scum S or the like from flowing out to the second section 132 and to prevent the suction efficiency of the suction path 51 from being lowered or blocked. it can.

A large number of slits can be formed in the vicinity of the lower end of the first section 131 by using a mesh or punching metal. The opening of the slit may be set to a size that does not allow the molten metal residue S to pass through. Due to the formation of the slit, the first section 131 functions as a wall that prevents inflow of the molten waste S or the like into the second section 132, and the resistance given to the airflow flowing out from the first section 131 toward the second section 132 is given. Can be reduced.
By forming a slit in the first section 131, the first section 131 provides resistance to the airflow while ensuring a long distance L and effectively preventing the molten residue S or the like from flowing into the second section 132. Pressure loss due to

In addition, when forming a slit in the 1st area 131, the state of liquid phase, such as the molten metal S mixed with gas, semi-solidification, and a solid phase shall be considered. In the case where the molten metal debris S flies to the first section 131 together with the gas, it is possible to avoid clogging of the slit by the molten metal debris S. By using the tip 20 provided with the suction recess 120 (FIG. 4 (a)), the molten metal in the sleeve 11 is prevented from violating, so that the gas flowing into the suction path 51 has a liquid phase or a semi-solid state. Therefore, it is suitable for forming a slit in the first section 131.

[First Modification of Third Embodiment]
As shown in FIG. 18, the first section 131 may extend in the horizontal direction, and the second section 132 may extend upward (or downward) with respect to the section connecting portion 133 that surrounds the first section 131. . The collection unit 134 is continuous downward with respect to the section connection unit 133.

According to the example shown in FIG. 18, similarly to the third embodiment, the gas flowing out from the first section 131 wraps around the outer periphery of the side wall 131 </ b> B and flows into the second section 132. Therefore, the molten scum S and the like can be separated and collected from the gas by inertial force, centrifugal force, and collision of the airflow with the side wall 131B and the inner wall 133A of the section connecting portion 133. Molten waste S or the like separated from the gas accumulates on the inner wall of the section connection portion 133 and the inside of the collection portion 134 due to its own weight.

In the example shown in FIG. 18 as well, the positional relationship between the outlet 131A of the first section 131 and the inlet 132A of the second section 132 can be determined as in the third embodiment. The position Ps1 of the outlet 131A in the extending direction D4 of the first section 131 is preferably located in front of the extending direction D4 (the tip side of the arrow) compared to the position Ps2 of the inlet 132A. The difference between the position Ps1 and the position Ps2 corresponds to the above-described difference (distance L) between the height H1 and the height H2.

[Second Modification of Third Embodiment]
FIG. 19 shows the collection structure 130 more specifically. The same components as those of the collection structure 130 shown in FIG.
A 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.
Similarly to the configuration shown in FIG. 16, the second section 132 is connected to the section connecting section 133 at a position where the first section 131 is surrounded by the section connecting section 133. A difference (distance L) between the heights H1 and H2 of the outflow port 131A and the inflow port 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 the respective flanges 133F and 134F. The flanges 133F and 134F are brought into contact with the annular center ring 135 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 peripheral side against pressure reduction in the collection unit 134 due to vacuum suction.

The collection unit 134 includes a pipe 134A and a lid member 134B that is screwed into the lower end of the pipe 134A. Another pipe and a connecting member (a nipple) with male threads formed at both ends can be added to the collecting part 134 to extend the length of the collecting part 134, and the volume of the collecting part 134 can be increased. Can be enlarged.

The diameter of the lower end side of the section connecting portion 133 is gradually reduced toward the collecting section 134, and a flange 133F is provided at the lower end of the section connecting portion 133. The flange 133F functions as a backflow prevention unit having a small opening cross-sectional area with respect to the collection unit 134. The backflow prevention unit prevents the molten scum S or the like from flowing back 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 opening cross-sectional area inside the flange 134F of the collecting portion 134 with which the flange 133F is abutted via the center ring 135. The ratio of the inner diameter of the flange 133F to the inner diameter of the collection part 134 can be set to 1.5 to 3 times, for example, but is not limited thereto.

Since the backflow prevention part (flange 133F) is arranged between the collection part 134 and the second section 132, the molten metal S or the like accumulated in the collection part 134 is wound up by the air current and heads upward. In addition, the outflow of the molten scum S or the like from the collection unit 134 can be suppressed by the backflow prevention unit (flange 133F), and the molten scum S or the like can be retained inside the collection unit 134.
As described above, the suction path 51 is used for both vacuum suction and air blow. By the backflow prevention unit, it is possible to regulate the outflow of the molten scum S or the like from the collection unit 134 during the air blow. In addition, when switching between vacuum suction and air blow, it is not necessary to change the constituent members of the suction path 51 including the collection structure 130, so that production can be continued without causing assembly work of the suction path 51. It can be carried out.

The first section 131 includes a flange 131F obtained by drilling a disk-shaped blank flange, and cylinders 131D and 131E (pipe or nipple) joined to the upper and lower surfaces around the hole of the flange 131F by welding. Etc.).
An annular center ring 137 is interposed between the upper end portion 133B of the section connecting 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 connecting portion 133. And sealed. The flange 133G and the flange 131F are restrained by a clamp 138.

A bellows-like pipe 139 is connected to the second section 132 via a center ring 137. Since the molten metal debris S mixed in the gas can be sufficiently removed by the collection structure 130, the bellows-like pipe 139 having a high degree of freedom of installation can be used as compared with a pipe that does not have elasticity. .

In the example shown in FIG. 19, the backflow prevention portion (flange 133 </ b> F) having an opening concentric with the axis of the section connection portion 133 and the collection portion 134 is provided at the junction between the section connection portion 133 and the collection portion 134. Has been placed. Not only this example but the collection structure 130 may be provided with the backflow prevention part which has the opening eccentric with respect to the axial center of the area connection part 133 and the collection part 134, and a semicircular backflow prevention part. . Such a backflow prevention unit is not limited to the joint portion between the section connection unit 133 and the collection unit 134, and may be disposed inside the pipe 134 </ b> A of the collection unit 134, for example.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. The collection structure 140 shown in FIG. 20 includes a ball valve 141 that can open and close an outlet 144A provided in the collection unit 144. Except for this point, the collection structure 140 is configured in the same manner as the collection structure 130 of the third embodiment. The collection part 144 is formed integrally with the section connection part 133.
Hereinafter, the description will focus on items that are different from the collection structure 130 of the third embodiment.
An outlet 144A through which the molten metal S or the like can pass is provided at the lower end of the collection part 144.

The ball valve 141 includes a ball 141A as a valve body, and a housing 141B provided with a valve seat for receiving the ball 141A. The ball valve 141 is opened and closed by rotating the ball 141A around an axis 141C orthogonal to the passage (bore) inside the housing 141B.
According to the collection structure 140, it is possible to close the ball valve 141 to collect the molten scum S and the like and open the ball valve 141 to discharge the molten scum S and the like.

The position of the outlet 144A is not necessarily limited to the lower end portion of the collecting portion 144. Even if the outlet 144A is provided on the side wall 144B of the collection part 144, the molten metal debris S and the like can be discharged by the pressure of the air flow during air blowing.
Further, regardless of the position of the outlet 144A, it is not obstructed to manually open the ball valve 141 and take out the molten metal S or the like from the outlet 144A.

The collection structure 140 is
(1) In the collection part 144, a ball valve 141 (open / close) capable of opening / closing an outlet 144A provided at a position lower than a height H2 of a connection point (inlet 132A) between the section connection part 133 and the second section 132 A kind of valve).
(2) It is preferable to install a molten metal receiver 142 for receiving the molten metal S or the like below the ball valve 141.

The ball valve 141 is driven by an electric or air (compressed air) driven actuator 143 to open and close the outlet 144A.
When vacuum suction is performed through the suction path 51 in a state where the outlet 144A is closed by the ball valve 141, the molten scum S or the like separated from the gas is collected in the collection unit 144.
When the outlet 144 </ b> A is opened by the ball valve 141, the molten metal S or the like accumulated inside the collecting unit 144 can be discharged to the outside of the collecting unit 144. In the example shown in FIG. 20, the molten scum S or the like falls from the open outlet 144 </ b> A to the molten scum receiver 142.

The ball valve 141 is preferably opened at the time of air blowing through the suction path 51. When the ball valve 141 is opened at the time of air blowing, the molten metal S or the like collected inside the collecting unit 144 during vacuum suction can be discharged to the outside of the collecting unit 144. In addition to the movement of the ball 141A when the ball valve 141 is opened, the pressure of the air flow at the time of air blowing also acts, so that the molten metal S adhering to the ball 141A is also detached from the ball 141A and exposed to the outside. Can be discharged.

As described above, by using the tip 20 provided with the suction recess 120 (FIG. 4A), the melt flowing in the sleeve 11 is suppressed, so that the gas flowing into the suction path 51 is liquid. Phase or semi-solid molten metal S is difficult to mix. Therefore, the operation of the ball valve 141 is not affected by the adhesion of the liquid phase or semi-solid state molten metal S, and the molten structure S is collected by the collecting structure 140 and the molten material S is discharged. However, it can operate stably. Note that the operation of the ball valve 141 is not affected even if a solidified piece of thin molten metal S or a lubricant is mixed in the gas.

According to the test using the tip 20 provided with the suction recess 120, the melt of the molten metal in the sleeve 11 is suppressed, so that the solid melt S is mixed into the gas flowing into the suction path 51. Even if it exists, it will remain in a small quantity, and the molten metal debris S solidified in the lump will not mix with gas and fly to the collection part 144. Therefore, the operation of the ball valve 141 can be avoided and the operation can be stably performed.

By opening the ball valve 141 by the actuator 143 during air blow, the molten waste S and the like can be automatically discharged to the outside of the collection unit 144 during air blow. Each time the air blow is performed, the amount of the molten metal S or the like accumulated in the collection unit 144 can be suppressed by removing the molten metal S or the like from the inside of the collection unit 144. If it does so, the quantity of the molten metal waste S etc. which are attracted | sucked to the 2nd area 132 connected with the collection part 144 can be reduced effectively, and it can contribute also to the reduction of the cleaning frequency of the vacuum filter 31.
In the present embodiment, since the molten scum S or the like is discharged to the outside of the collection unit 144, it is sufficient to clean the molten stag receiver 142 on which the molten scum S or the like has accumulated.

The larger the volume of the molten metal receiver 142, the lower the frequency of cleaning, which is advantageous in terms of work efficiency. The volume of the molten metal receiver 142 is preferably determined appropriately in view of work efficiency and the manufacturing cost of the molten metal receiver 142.

According to the collection structure 140 of the present embodiment, the ball valve 141 is opened during air blow, and the molten waste S and the like can be discharged from the collection portion 144 into the molten waste receiver 142. Production can be continuously performed while the collected molten metal S or the like is automatically and periodically taken out from the collection unit 144.

Instead of the ball valve 141, other valves that can reliably close the outlet 144A of the collection unit 144 during vacuum suction, such as a butterfly valve or a gate valve, may be employed.

[Fifth Embodiment]
Next, a vacuum piping structure 150 that is a part of the suction path 51 according to the fifth embodiment of the present invention will be described with reference to FIGS. The fifth embodiment relates to facilitating cleaning of the molten metal debris S and the like adhering to the inside of the vacuum pipe. The vacuum piping structure 150 disclosed in the fifth embodiment includes the injection apparatus 1 and 6 of the first and second embodiments and the die casting machine 100 including the injection apparatus 1 or 6, as well as the injection apparatus and die casting machine of the die casting machine. Can be applied to the machine.

The configurations disclosed in the fifth embodiment and the modified example of the fifth embodiment can also be applied to an injection device including a plunger including a tip in which the suction recess 120 is not partitioned and a sleeve.

The fifth embodiment shows a structure of a suction path 51 (vacuum pipe) for vacuum-sucking the space formed in communication from the internal space of the sleeve 11 to the cavity 23. Here, the suction path 51 for sucking the inner space of the sleeve 11 from each of the suction ports 14 to 17 which are a plurality of holes in the sleeve 11 will be described. However, the suction path 51 is provided at one place or a plurality of places of the mold. The same applies to the suction path for sucking the inside of the cavity 23 from the connection port 28.

In FIG. 21, the collection unit 152 provided in the course of the suction path 51 through which the gas is sucked from the inside of the sleeve 11 through the suction port 14, and extends from the upstream side of the collection unit 152 toward the collection unit 152. A vacuum piping structure 150 with a cleaning section 151 is shown.

The cleaning section 151 includes suction ports 14 to 17 connected to the internal space of the sleeve 11 that is a generation source of the molten metal S and the like in the suction path 51, and a collection unit 152 that collects the molten metal S and the like mixed in the gas. Corresponds to the interval between

For example, due to the influence of variations in the temperature of the molten metal to be injected, injection conditions, mold temperature, thermal expansion of the mold, etc., molten scum S or the like is introduced into the suction path 51 from the suction port 14 (or 15 to 17). There is a possibility that the molten metal debris S or the like adheres to the inside of the suction path 51. The adhering molten metal S or the like forms a throttle portion in the suction path 51.
Here, the upstream side of the collecting unit 152 in the flow of the sucked gas has a larger amount of the molten metal S or the like mixed in the gas than the downstream side (vacuum tank 36 side) of the collecting unit 152. The molten metal residue S or the like is likely to adhere to the inner wall of the pipe. Therefore, the cleaning section 151 upstream from the collection unit 152 has a higher need to remove the molten scum S or the like by cleaning than the piping downstream from the collection unit 152.

That is, the cleaning section 151 is a section in which the necessity for cleaning is relatively high in the suction path 51. This embodiment contributes to the improvement of the cleaning work efficiency of the cleaning section 151 by the structure in which the plurality of pipes 153 forming the cleaning section 151 are connected by the connecting member 160 provided with the gripping portion 161.
The cleaning section 151 is provided in the suction port 14 (or 15 to 17) so that the inside of the pipe 153 can be easily cleaned over almost the entire length from the suction port 14 (or 15 to 17) to the collection unit 152. It is preferable that it extends from the vicinity to the vicinity of the collection part 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. In addition, 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, any of the suction paths 51 corresponding to the suction ports 15 to 17 can each include a cleaning section 151 and a collection unit 152. Of the suction paths 51 corresponding to each of the suction ports 14 to 17, the cleaning section 151 and the collecting unit 152 can be provided only in at least one suction path 51 that is particularly easily blocked by the molten metal S or the like.

The cleaning section 151 has a curved shape as a whole by connecting a plurality of pipes 153. The plurality of pipes 153 include a straight pipe portion 153A that extends linearly and a bent pipe portion 153B that is bent. When the straight pipe portion 153A and the curved pipe portion 153B are not particularly distinguished, they are referred to as a pipe 153. When the cleaning section 151 is disassembled into a plurality of pipes 153, the cleaning section 151 is divided into pipes 153 having an appropriate length so that the work of removing the molten metal S attached to the inner wall of each pipe 153 can be easily performed. be able to.
The flanges of the plurality of pipes 153 are connected by a connecting member 160. The connecting member 160 has a gripping portion 161 exposed outside the pipe 153 and can be attached to and detached from the flange by hand using the gripping portion 161.

The vacuum line is typically constructed using steel pipes and threaded joints such as nipples, unions, elbows, etc., and it is necessary to use tools when disassembling these components. .
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 gripping portion 161, and each pipe 153 can be cleaned. Therefore, it contributes to the improvement of the work efficiency of cleaning the molten metal debris S attached to the inner wall of the pipe 153.

From the above, the vacuum piping structure 150 is
(1) A cleaning section 151 including a plurality of straight pipe portions 153A and a plurality of curved pipe portions 153B;
(2) The collection part 152 (box for molten metal waste) is provided.
The suction port 14 (or 15 to 17) and the collecting portion 152 are connected by a curved cleaning section 151 formed by combining the straight tube portion 153A and the curved tube portion 153B.

The pipe 153 (straight pipe portion 153A and curved pipe portion 153B) is not flexible and flexible unlike a bellows pipe (bellows pipe) and is formed into a predetermined shape from an appropriate material such as metal. ing. In addition, the bellows tube (bellows tube) has a corrugated uneven shape on the inner peripheral portion from a shape in which peaks and valleys are alternately formed in the longitudinal direction, whereas the pipe 153 of this embodiment is In order to suppress adhesion and retention of the liquid phase or the semi-solidified molten material S, it is preferable to have a smooth inner peripheral surface.
In the case where liquid phase or semi-solid state molten metal S or the like does not enter the pipe 153, it is also acceptable to use a bellows pipe or the like for the pipe 153.

As long as the connecting member 160 can be attached and can be used for vacuum suction, an appropriate pipe can be adopted as the pipe 153.
For example, as the straight pipe portion 153A, a carbon steel pipe for piping according to Japanese Industrial Standard JIS G 3452 can be used. For example, an NW / KF standard 90 ° elbow can be used as the curved pipe portion 153B.

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 for a portion extending upward from the suction port 14, a portion extending horizontally, and a portion extending downward.
The straight pipe portion 153A used for the portion extending upward and the straight pipe portion 153A used for the portion extending horizontally are connected by a curved pipe portion 153B. The straight pipe portion 153A used for the horizontally extending portion and the straight pipe portion 153A used for the upward extending portion are connected by another curved pipe portion 153B.

The cleaning section 151 may be curved into a more complicated shape than the illustrated inverted U shape. For example, the cleaning section 151 may be configured to include a curved pipe portion 156 shown in FIG. The curved pipe portion 156 includes a first end portion 156A, a bent portion 156B, and a second end portion 156C, and the first end portion 156A and the second end portion 156C open in opposite directions. . The axial center X1 of the opening of the first end 156A and the axial center X2 of the opening of the second end 156C are parallel to each other and are separated in a direction perpendicular to the axial direction of the opening.
When assembling the cleaning section 151 from a plurality of pipes, it is possible to absorb the manufacturing error of the pipe by rotating the curved pipe portion 156 and other pipes around the shaft centers X1 and X2, thereby cleaning the cleaning section 151. Is easy to assemble.

The collection part 152 collects the molten metal debris S separated from the sucked gas by inertial force and centrifugal force.
With this collection part 152 and the piping 153 and the piping 154 communicating via the collection part 152, the molten metal waste S etc. are separated and collected from gas.

The collection part 152 connects the piping 153 and the piping 154, and stores the molten metal residue S etc. inside.
A pipe 153 (straight pipe part 153A or curved pipe part 153B) that terminates the cleaning section 151 is connected to the collection part 152, and a pipe 154 into which a gas from which the molten metal debris S or the like is separated flows is connected. ing. In the example shown in FIG. 21, the collection part 152 and the piping 154 are integrally formed.

The gas flowing downward from the lower end of the straight pipe portion 153A toward the inside of the collecting portion 152 is turned toward the pipe 154 inside the collecting portion 152 and is opened in the inner wall of the collecting portion 152 (not shown). It flows into the pipe 154 from the inflow port. In the process in which the gas flowing out from the straight pipe portion 153A flows inside the collecting portion 152, the molten metal S having a larger weight and density than the gas is separated from the gas by the inertial force and the centrifugal force. It is collected by the inner wall and collected inside.

It can replace with the collection structure which consists of the collection part 152, the straight pipe part 153A, and the piping 154, and the collection structure 130 of 3rd Embodiment and the collection structure 140 of 4th Embodiment are employable. 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 composed of the collection section 152, the straight pipe section 153A, and the pipe 154, a known structure that can separate and collect the molten scum S from the gas can be employed.

Next, the connecting member 160 (part for vacuum piping) will be described with reference to FIGS. The connecting member 160 serves as a pipe joint that enables 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 collecting portion 152 by a flange. .

22 is an enlarged cross-sectional view of a main part showing the configuration of the connecting member 160, and is a cross-sectional view taken along the line XXII-XXII in FIG.
The connecting member 160 includes a center ring 162 disposed between adjacent flanges 153F and 153F of the pipe 153, and a clamp 163 that restrains the flanges against each other via the center ring 162.

As shown in FIGS. 22 and 23, the clamp 163 includes two or more clamp bodies 163A and 163B arranged around the flanges 153F and 153F, and tightens or loosens the clamp bodies 163A and 163B with respect to the flanges 153F and 153F. And a gripping portion 161 that can be attached.

As shown in FIG. 22, the center ring 162 is sandwiched between the flange 153F of the pipe 153 and the flange 153F of the other pipe 153, and outside air enters the inside of the pipe 153 from the gap between the flanges 153F and 153F. It plays the role of a seal to prevent this, and is formed in a hollow cylindrical shape (annular shape).

Referring to the example shown in FIG. 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 peripheral side. The center ring 162 preferably includes a mesh 162C for suppressing the passage of the molten metal residue S or the like.
The center ring 162 shown in FIG. 22 is a center ring with a mesh of NW / KF standard, but besides this, it is possible to prevent outside air from entering the inside of the pipe 153 between the flanges 153F and 153F. Any suitable seal member that is possible can be employed.

The flange 153 </ b> F protrudes outward in the radial direction of the pipe 153 at the end of the pipe 153 and is formed in a hollow cylindrical shape. The flange 153F has an opposing surface F1 that faces the counterpart flange 153F and a tapered back surface F2.
The facing surface F1 is orthogonal to the axis A1 of the pipe 153.
The taper back surface F2 is inclined with respect to the axis A1 so that the outer end in the radial direction of the pipe 153 is closer to the other flange 153F than the inner end. The tapered back surface F <b> 2 is in contact with the inclined tapered inner wall 164 </ b> A of the clamp 163.

Flange (not shown) is also formed at the airflow outlet of the suction port 14 (or 15 to 17) and the airflow inlet of the collecting unit 152, respectively. These flanges can also be formed in the same manner as the flange 153F shown in FIG.

Each of the flanges 153F and 153F shown in FIG. 22 is a flange of NW / KF standard, ISO 2861 “Vacuum Technology—Dimensions of clamped-type quick-release couplings”, and has the same shape. However, as long as the flange-type pipe joint structure is established by the flanges 153F and 153F, the flanges 153F and 153F may have an appropriate shape or may have different shapes.
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 required, and a flanged pipe that is commercially available with the flange 153F provided on the pipe 153 can also be used.

The clamp 163 fastens and fixes the flanges 153F and 153F sandwiching the center ring 162 therebetween.
Based on the example shown in FIGS. 22-24, 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 gripping portion 161.
In addition to the above, the clamp 163 may include a ratchet mechanism (not shown).

FIG. 23 is a diagram illustrating the clamp 163 in the closed state, and FIG. 24 is a diagram illustrating the clamp 163 in the open state.
The first clamp body 163A and the second clamp body 163B are formed in a C shape (arc shape) in a plan view, and are disposed so as to surround a flange 153F (not shown in FIG. 23) such as the pipe 153.

As shown in FIG. 22, each of the first clamp main body 163A and the second clamp main body 163B is formed with an annular groove 164 that receives the flanges 153F and 153F abutted through the center ring 162. Inside the groove 164, tapered inner walls 164A corresponding to the respective taper back surfaces F2 of the flanges 153F and 153F are formed.

As shown in FIGS. 23 and 24, the hinge mechanism 165 couples one end of the first clamp body 163A and one end of the second clamp body 163B.
A fastening mechanism 166 is provided at the other end (fastening end) of each 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 can rotate around the first pin 165A, and the second clamp body 163B can rotate around the second pin 165B. Therefore, as shown in FIG. 24, the clamp is opened between the fastening end of the first clamp body 163A and the fastening end of the second clamp body 163B, and closed between these fastening ends. It exhibits a closed state (FIG. 23).

When connecting the pipes 153 and 153 by the connecting member 160, as shown in FIG. 24, the hinge mechanism 165 opens between the fastening portion of the first clamp body 163A and the fastening portion of the second clamp body 163B, As shown in FIG. 22, the flanges 153 </ b> F and 153 </ b> F are inserted into the groove 164. Next, as shown in FIG. 23, the flanges 153F and 153F are restrained by fastening the first clamp body 163A and the second clamp body 163B by the fastening mechanism 166.

As shown in FIGS. 22 to 24, the fastening mechanism 166 engages with the shaft portion 166A and the shaft portion 166A that connects the fastening end portion of the first clamp body 163A and the fastening end portion of the second clamp body 163B. A wing nut 166C and a washer 166E are provided.
The distal end portion of the shaft portion 166A is held on the outer peripheral side from the wall 164B corresponding to the bottom of the groove 164 by a pin 166D penetrating the distal end portion 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 no pin is inserted into the through hole of the second clamp body 163B.
In the wing nut 166C, a portion protruding radially outward from the female screw portion corresponds to the grip portion 161 that is gripped when the clamp 163 is attached to and detached from the flanges 153F and 153F.

Note that the gripping portion 161 is not necessarily a part of the wing nut 166C. The gripping portion 161 can be appropriately configured as long as it can grip 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 that engages with the shaft portion 166A in a direction orthogonal to the axial direction of the nut.

When the flanges 153F and 153F are surrounded by the first clamp body 163A and the second clamp body 163B and the wing nut 166C is manually tightened with respect to the male thread portion of the shaft portion 166A using the grip portion 161, the first clamp body 163A and The second clamp body 163B rotates around the pins 165A and 165B, respectively, and the distance between the first clamp body 163A and the second clamp body 163B is reduced. Therefore, as the entire clamp 163 is displaced from the radially outer side to the radially inner side and the diameter of the clamp 163 is reduced, the tapered inner wall 164A is pressed against the tapered back surface F2 of the flange 153F. Then, due to the wedge effect of both tapered surfaces 164A, F2, a force is generated in a direction that pulls the flanges 153F, 153F toward each other in the axial direction of the pipe 153. While doing so, the flanges 153F and 153F are restrained.

Then, since the gap between the flanges 153F and 153F is hermetically sealed, vacuum suction can be performed from the sleeve 11 through the suction path 51. Since the molten scum S or the like mixed in the sucked gas is separated from the gas and collected by the collecting unit 152, the operation of the die casting machine can be stably performed while suppressing the lowering of the suction efficiency and the blockage of the pipe line. It can be carried out.

When cleaning the cleaning section 151, the first clamp body 163A and the second clamp body 163B are flanged 153F, 153F by manually turning the wing nut 166C using the gripping portion 161, as shown in FIG. The first clamp body 163A and the second clamp body 163B can be detached from the flanges 153F and 153F.
Then, since the connection of the flanges 153F and 153F such as the pipe 153 by the connecting member 160 is released, the cleaning section 151 can be disassembled into a plurality of pipes 153 and cleaned by an appropriate method.
For example, the molten metal debris S is blown off from the inner periphery of the pipe 153 by blowing air, or a rod-shaped member is inserted into the pipe 153, and the molten debris S or the like is inserted into the pipe 153 by the rod-shaped member. It can be peeled off from the periphery. The smooth inner wall of the pipe 153 is easier to remove the adhering molten scum S and the like than the inner wall having the unevenness of the bellows pipe.
If 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 manually connected or released using the gripping portion 161 of the connecting member 160 without using a tool. Disassembly of the cleaning section 151 at the time of cleaning and assembly of the pipe 153 after cleaning can be performed in a short time.

The clamp 163 shown in FIGS. 22 to 24 is a vacuum pipe clamp that fastens and fixes NW / KF standard flanges, but this is only an example. As long as it has a gripping part that is exposed to the outside of the pipe 153 and can be manually tightened or loosened with respect to the flange, and can be attached to and detached from the flange by the gripping part, the clamp 163 Instead of this, a clamp having an appropriate configuration can be employed.
For example, it includes a chain formed by connecting a plurality of (for example, four) links (clamp bodies) in which grooves for receiving the flanges 153F and 153F are formed, and knobs (gripping portions) for tightening both ends of the chain with screws. Chain type clamps can be used. When the knob is gripped and rotated around the axis of the screw to reduce the diameter of the chain, the flanges 153F and 153F are restrained inside the chain.

[Modification of Fifth Embodiment]
Like the cleaning section 155 shown in FIG. 25, the cleaning section 155 may extend upward from the suction port 14 (or 15 to 17) and bend toward the collecting portion 152 in the horizontal direction. A collecting portion 152 is connected to a horizontal portion 155H of the cleaning section 155.
Moreover, although illustration is abbreviate | omitted, even if the cleaning area is provided with the part curved in the reverse U shape similarly to the above-mentioned cleaning area 151 (FIG. 21), and the part extended from the said part and extended in a horizontal direction. Good. Also in that case, the collection part 152 can be connected to the part extended in a horizontal direction.

[Sixth Embodiment]
With reference to FIG. 27, a structure relating to a suction path 52 through which gas is sucked from the cavity 23 through a cavity suction port (connection port 28) formed in the molds 21 and 22 will be described.
The suction path 52 includes a vacuum tank and a vacuum pump, like the above-described suction path 51 (FIG. 2) connected to the suction ports 14 to 17 of the sleeve 11.
The suction path 52 may include the collection structures 130 and 140 of the third to fourth embodiments described above, the vacuum piping structure 150 and the connection member 160 of the fifth embodiment.

In the example shown in FIG. 27, a collection structure 130 is provided in the middle of a suction path 52 through which gas is sucked from the cavity 23 through the connection port 28 of the molds 21 and 22. The suction path 52 includes a cleaning section 151 that extends from the vicinity of the connection port 28 to the vicinity of the collection unit 134.

According to the sixth embodiment, the molten metal debris S mixed in the gas sucked into the suction path 52 from the cavity 23 through the connection port 28 is separated from the gas by the collection structure 130 and captured in the collection unit 134. Can be collected.
Further, the cleaning section 151 is easily disassembled into a plurality of pipes 153 by the connecting member 160 having the gripping parts 161 (FIGS. 23 and 24), and the molten metal S or the like adhering to each of the pipes 153, the collecting part 134, etc. Can be cleaned.

In addition to the above, the configurations described in the above embodiments can be selected or changed to other configurations as appropriate without departing from the gist of the present invention.

100 Die-casting machine 1, 6, 6A Injection device 2 Vacuum suction system 3 Control device 4 Movable platen 5 Fixed platen 7 Tie bar 8 Machine base 9 Pressurized air supply system 10 Hole 11 Sleeve 11A Inner peripheral part 11B Rear end part 11C Tapered surface 11D Hole for sealant pipe 12 Plunger 13 Pouring port 14-17 Suction port 18 Molten metal 18A Molten surface 19 Plunger rod 20 Plunger tip 20A Front end 20B Rear end 20C Tip portion 21D Tip joint 21 Fixed mold 22 Movable mold 23 Cavity 24 Runner 25 Gate 27 Chill vent 28 Connection port (cavity suction port)
31 Vacuum filter 32 Pressure detection unit 33 Selection valve 34 Merge / distribution unit 35 Vacuum / air blow switching valve 36 Vacuum tank 37 Vacuum pump 38 Pressure tank 39 Compressed air source 41 Extrusion plate 42 Extrusion pin 43 Ladle 51 Suction path 51A Region 55, 56 Piping 60 Sealing agent supply device 61 Sealing agent 62 Container 70 Sliding seal 70A Inner peripheral part 70B Outer peripheral part 71 Discontinuous part 72 Seal holding member 72A Outer peripheral part 75 Front space 79 Sealing member 79A Outer end 80 Discontinuous part 80B Boundary 81 First sliding seal 82 Second sliding seal 88 Space 89, 90 Clearance 120 Suction recess 130 Collection structure 130F Flow path 131 First section 131A Outlet 131B Side wall 131C Outer peripheral part 131D, 131E Cylindrical body 131F Flange 132 Second section 32A inlet 133 segment connecting portion 133A inside wall 133B upper portion 133F flange (backflow prevention unit)
133G Flange 134 Collection part 134A Piping 134B Lid 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 waste receiver 143 Actuator 144 Collection part 144A Outlet 144B Side wall 150 Vacuum piping structure 151 Cleaning section 152 Collection section 153 Pipe 153A Straight pipe section 153B Curved pipe section 153F Flange 154 Pipe 155 Cleaning section 156 Curved pipe section 156A First end section 156B Bending section 156C Second end 160 Connecting member 161 Grasping part 162 Center ring 162A O-ring 162B Metal ring 162C Mesh 163 Clamp 16 3A, 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 166C Wing nut 166D Pin 166E Washer 201 First large diameter portion 202 Second large diameter portion 202A Region 202B Outer peripheral surface 202C Seal holding groove 203 Small diameter portion 203A Outer peripheral portion 203B Two-sided width 631 First piping 631A Outlet 632 Second piping 632A Outlet 701 One end 701A Front convex portion 701B End surface 702 Other end portion 702A Rear convex portion 702B End surface 711 First 1 gap 712 2nd gap 713 3rd gap 715,716 Dividing part 717 Concave part 718 Convex part 791 Seal member A Circuit A1 Axis line D1 Advancing and retracting direction D2 Radial direction D3 Circumferential direction D4 Extending direction F1 Opposing surface F2 Te Pas rear Gp gaps H1, H2 height P0, P1, P2 pressure Ps1, Ps2 position R1 projection range S molten slag X1, X2 axis

Claims (21)

1. An injection device comprising: a sleeve to which molten metal is supplied inside; and a plunger capable of moving forward and backward inside the sleeve, and injecting the molten metal toward a cavity of a die casting machine by the plunger,
   The tip of the plunger is retracted inward in the radial direction with respect to the inner peripheral portion of the sleeve, and a suction recess that is continuous in the circumferential direction is defined,
   It is configured to be able to suck the space ahead of the front end of the chip and the inside of the suction recess,
   The sleeve is formed with two or more suction ports penetrating the sleeve between the inner side and the outer side and capable of sucking the inner side of the sleeve side by side in the forward and backward direction of the plunger,
   Depending on the position of the plunger that moves forward relative to the sleeve, at least one of the two or more suction ports communicates with the front space, and selectively from the two or more suction ports. At least one communicates with the inside of the suction recess,
   An injection device for a die casting machine characterized by the above.
2. The two or more suction ports are arranged at a predetermined interval in the forward / backward direction,
   The tip has a first large-diameter portion located on the front side in the advance / retreat direction and a second large-diameter located on the rear side in the advance / retreat direction, and divides the suction recess between the first large-diameter portion. And comprising
   The number of suction ports is n,
   Ls2 is the dimension of the suction port in the advance / retreat direction.
   The interval between the suction ports adjacent to each other in the forward / backward direction is Ls3,
   The dimension of the advancing / retreating direction of the recess for suction is Lp0,
   The dimension of the first large diameter portion in the advance / retreat direction is Lp1,
   When the dimension of the advancing / retreating direction of the second large diameter portion is Lp2,
   Lp1 <n × Ls2 + (n−1) × Ls3
   The injection device of the die-casting machine according to claim 1.
3. When the distance in the advancing / retreating 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
   The injection device for a die casting machine according to claim 2.
4. Lp2 ≧ Ls2
   The injection device for a die casting machine according to claim 2 or 3.
5. Lp0> Ls3.
   The injection device for a die casting machine according to any one of claims 2 to 4.
6. A sliding seal that is continuous in the circumferential direction along the outer peripheral portion of the tip of the plunger and slides on the inner peripheral portion of the sleeve as the plunger advances and retreats;
   The sliding seal is located at a site other than the suction recess in the chip.
   The injection device for a die casting machine according to any one of claims 1 to 5.
7. A seal member disposed inside the sliding seal in the radial direction and sealing a gap between the sliding seal and the chip;
   The injection apparatus of the die-casting machine according to claim 6.
8. Comprising two or more sliding seals arranged in a forward and backward direction of the plunger;
   The seal member is disposed between at least one of the sliding seal and the tip;
   The injection device for a die casting machine according to claim 7.
9. The sliding seal is formed in an annular shape including a discontinuous portion which is a discontinuous portion in a part of the circumferential direction, and presses the inner peripheral portion of the sleeve toward the outer side in the radial direction. Attached to the tip and the sleeve;
   The seal member is formed in an annular shape and is bent between the sliding seal and the chip to seal the gap.
   The injection device for a die casting machine according to claim 7 or 8.
10. In the tip, a suction recess is defined between an outer peripheral portion of the first large diameter portion located on the front side in the advance / retreat direction and a rear side in the advance / retreat direction, and the first large diameter portion. A sealant supply device capable of supplying a sealant to the outer peripheral part of the two large diameter parts;
    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.
    The injection device for a die casting machine according to any one of claims 1 to 9.
11. In the course of the suction path through which the gas is sucked from the inside of the sleeve through the suction port, a collecting structure for collecting the molten metal mixed in the gas is provided,
    The collection 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 the upstream side of the suction path toward the collection unit;
    A section connecting portion that surrounds the first section from the outside and reaches the collecting section beyond the first section;
    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,
    The first section and the second section communicate with each other through the inside of the section connecting portion.
    The injection device for a die casting machine according to any one of claims 1 to 10.
12. The first section extends downward toward the collection unit,
    The height of the outlet of the first section is equal to or less than the height of the inlet of the second section.
    The injection device for a die casting machine according to claim 11.
13. The section connection section includes a backflow prevention section having a small opening cross-sectional area with respect to the collection section.
    The die casting machine injection apparatus according to claim 11 or 12.
14. The collection structure is
    An outlet provided in the collection part and through which the molten metal can pass;
    A valve capable of opening and closing the outlet,
    The injection device for a die casting machine according to any one of claims 11 to 13.
15. A collecting portion that is provided in the course of a suction path through which gas is sucked from the inside of the sleeve through the suction port, and that collects the molten metal mixed in the gas;
    A cleaning section that is at least a part of the suction path and extends from the upstream side of the collection section toward the collection section, and
    The cleaning section has a curved shape from a plurality of pipes in which flanges are connected by a connecting member,
    The connecting member has a gripping part exposed outside the pipe, and can be attached to and detached from the flange by the gripping part.
    The injection device for a die casting machine according to any one of claims 1 to 14.
16. The connecting member is
    A center ring disposed between the flanges;
    A clamp that restrains the flanges against each other via the center ring,
    The clamp is
    Two or more clamp bodies disposed around the flange;
    The grip part capable of tightening or loosening the clamp body with respect to the flange, and
    The injection device for a die casting machine according to claim 15.
17. A die casting machine having a suction path for vacuum suction in a space formed in communication from an internal space of a sleeve to a cavity of a mold,
    In the course of the suction path through which the gas is sucked from the cavity through the cavity suction port formed in the mold, a collecting structure for collecting the molten metal mixed in the gas is provided,
    The collection 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 the upstream side of the suction path toward the collection unit;
    A section connecting portion that surrounds the first section from the outside and reaches the collecting section beyond the first section;
    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,
    The first section and the second section communicate with each other through the inside of the section connecting portion.
    Die-casting machine characterized by that.
18. A vacuum piping structure of a die casting machine that vacuum-sucks the space formed in communication between the internal space of the sleeve and the cavity of the mold,
    A collecting part that is provided in the course of a suction path through which gas is sucked from the cavity through a cavity suction port formed in the mold, and collects molten metal debris mixed in the gas;
    A cleaning section that is at least a part of the suction path and extends from the upstream side of the collection section toward the collection section, and
    The cleaning section has a curved shape from a plurality of pipes in which flanges are connected by a connecting member,
    The connecting member has a gripping part exposed outside the pipe, and can be attached to and detached from the flange by the gripping part.
    This is the structure of vacuum piping for die casting machines.
19. A casting method using an injection device that injects the molten metal toward a cavity of a die casting machine by a plunger capable of moving back and forth inside a sleeve to which molten metal is supplied inside,
    The tip of the plunger is retracted inward in the radial direction with respect to the inner peripheral portion of the sleeve, and a suction recess that is continuous in the circumferential direction is defined,
    The sleeve is formed with two or more suction ports penetrating the sleeve between the inner side and the outer side and capable of sucking the inner side of the sleeve side by side in the forward and backward direction of the plunger,
    At least one suction port communicating with the inside of the suction recess while decompressing the space ahead of the tip by suction through at least one suction port communicating with the space ahead of the front end of the tip The inside of the suction recess is reduced by suction through,
    A casting method characterized by the above.
20. The sliding seal and the inner side in the radial direction of the sliding seal that continues in the circumferential direction along the outer peripheral portion of the tip of the plunger and slides on the inner peripheral portion of the sleeve as the plunger moves forward and backward. In a state where a seal member that seals a gap between the chip and the seal member is disposed, the sliding seal and the seal member are attached to the plunger and the sleeve,
    Sucking the front space and the inside of the suction recess,
    The casting method according to claim 19.
21. After finishing the suction in the sleeve through the suction port,
    Using a pressurized tank, air is ejected to the inside of the sleeve through the suction port.
    The casting method according to claim 19 or 20.
    

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