JPH07314513A - Metal mold for injection molding - Google Patents

Abstract

PURPOSE:To facilitate the die replacing work by draining water from the water circuit on the die side easily at the time of replacing the die thereby eliminating overflow of water. CONSTITUTION:When a die is replaced, solenoid valves V1, V2 for opening/ closing a circuit, an air compressor 74, and a solenoid valve V3 for controlling the air supply are operated. Since the air is fed into the water circuit 72 on the die side and the water is drained from the water circuit 72, water leakage does not occur even if the die is removed thereafter. Furthermore, a solenoid valve V4 is opened to expose the inside of water circuit 72 on the die side to the atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die apparatus in which a cassette type die can be exchanged, and more particularly, an improvement of a water circuit for draining cooling water which is carried out at the time of die exchange. Regarding

[0002]

2. Description of the Related Art Conventionally, in this type of mold apparatus for injection molding, since a high-temperature molding material melted in the mold is injected during the molding operation, it is necessary to adjust the temperature of the mold. In general, a mold is provided with a temperature controller that circulates and supplies cooling water through a water tube hose (water circuit) and adjusts the temperature of the cooling water.

[0003]

However, in such a mold apparatus, when the water pipe hose connected to the mold is removed when the mold is replaced, the water in the mold and the water pipe hose overflows, The surrounding area may be submerged in water, and in order to prevent the water from overflowing, draining the water in the water circuit on the die side may be performed before replacing the die. Was not designed to be easy.

The present invention solves the above-mentioned problems. When exchanging a mold, the water in the water circuit on the mold side can be easily drained with a simple structure, and water may overflow to the periphery. It is an object of the present invention to provide an injection-molding die device that can easily perform the die replacement work.

[0005]

In order to achieve the above object, the invention of claim 1 is a detachable cassette type mold,
In a mold apparatus for injection molding equipped with a temperature controller for circulating and supplying cooling water to this mold through a water circuit, a circuit opening / closing electromagnetic device provided in the water circuit for opening / closing the circuit. A valve, an air supply source that supplies air to drain water in the water circuit on the mold side before removing the mold when exchanging the mold, and an electromagnetic valve for air supply that controls the supply. is there. According to a second aspect of the present invention, in the injection molding die apparatus according to the first aspect, an air release solenoid valve for opening the water circuit to the atmosphere is further provided, and the air supply solenoid valve when the die is replaced. Open to supply air into the water circuit on the mold side from the air supply source to push the water in the water circuit to the temperature regulator side, and then close the circuit opening / closing solenoid valve, and The solenoid valve for opening is opened.

[0006]

According to the injection molding die apparatus of the first aspect of the present invention, the temperature-controlled cooling water is circulated and supplied from the temperature controller through the water circuit to the detachable cassette-type die during normal operation. Before replacing the mold, operate the solenoid valve for circuit opening / closing, the air supply source and the solenoid valve for air supply that controls the supply before removing the mold to supply air into the water circuit on the mold side. Drain the water in the circuit. Therefore, even if the mold is removed for the purpose of exchanging the mold thereafter, water will not leak. According to the second aspect of the present invention, in addition to the above-described action when the mold is replaced, the air supply solenoid valve is opened to supply air into the water circuit on the mold side from the air supply source, Water is pushed to the temperature regulator side, and then the circuit opening / closing solenoid valve is closed and the atmosphere opening solenoid valve is opened to open the mold side water circuit to atmospheric pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An injection molding die apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view conceptually showing a cassette-type mold unit and its holder, which are main components of the apparatus. The cassette mold unit 1 is composed of a fixed mold 2 and a movable mold 3, and a cavity 4 for molding a molding product by injecting a molding material such as resin on the facing parting surfaces. Is provided. Also,
The moving die 3 is provided with an ejector plate 5 (5a, 5b) that operates when the parting surface is opened and the molded product is taken out. There are many types of molds 2 and 3 of the mold unit 1, which will be described in detail later, but if the molded product molded by the cavity 4 of the mold has an undercut, this molding is performed. A slide core is provided which is movable in a direction different from the direction in which the parting surfaces of the molds 2 and 3 are opened for taking out the product. There is also a 3-plate type including a stripper plate for surface protrusion for taking out a molded product from the cavity 4.

The holder 6 is a member for holding the mold unit 1, and is composed of a fixed side holder 7 and a movable side holder 8 having a base block as a base, and the fixed side holder 7
A mounting plate 9 and a lock block 10, etc. are fixed to the holder, and a mounting plate 11 and a spacer block 12 are attached to the holder 8 on the moving side.
The lock block 13 and the like are fixed. These lock blocks 10 and 13 cause holder grooves 14 and 15 respectively.
Is formed, and the molds 2, 2 are formed in the holder grooves 14, 15.
When the projecting portions 16 and 17 of the receiving plates 2d and 3d of the third mold 3 are slid and inserted from above, the mold unit 1 is moved to the holder 6
It is detachably attached to. The fixed side and moving side holders 7 and 8 are attached to a die plate of a molding machine (not shown), and the mold is opened and closed by the action of the molding machine.
It is possible to take out molded products. An injection device is located on the front side of the fixed holder 7 in the drawing, and a lot is located on the rear side of the movable holder 8 in the drawing, which operates when the molded product is taken out and projects the rear surface of the ejector plate 5.

FIG. 2 is a plan view of the holder 6 (7, 8) for holding the mold unit 1. In the present embodiment, a slide core drive mechanism for removing the undercut is shown. The holder 6 is basically a fixed side and a moving side base block, and the whole is fixed to a molding machine (not shown), and the moving side holder 8 is moved to open and close the mold. FIG. 3 is a side view taken along the arrow A in FIG. 2, showing the holder 7 on the fixed side. FIG. 4 is a side view taken along the arrow B in FIG. 2, showing the holder 8 on the moving side. 5 is a plan view showing a fixed-side mold 2, a moving-side mold 3, and a drive mechanism of a slide core, and FIG. 6 is a plan view of a main part in a state where the molds 2 and 3 are mounted on the holder 6. 7 and 8 are perspective views of the respective parting surfaces of the mold 2 and the mold 3, respectively.

In these figures, the fixed holder 7
Has a mounting plate 9, a lock block 10, etc., and the movable holder 8 has a mounting plate 11, a spacer block 12, a lock block 13, etc. These holders 7 and 8 are connected to water pipe blocks 21 and 22 on which the molds are placed when the molds 2 and 3 are mounted, and these water pipe blocks 21 and 22 are the parties of the molds 2 and 3. The rod 2 so that it can move in the same direction as the holder 8 when opening the ring surface.
It is supported by 3, 24 and can be driven by air cylinders 25, 26. Each of the water pipe blocks 21 and 22 is provided with discharge and suction connection ports 27 and 28 for circulatingly supplying cooling water to the molds 2 and 3, and is connected to a cooling water circulation water pipe. . A packing member 29 for preventing water leakage is fitted into the connection ports 27 and 28. Further, when the molds 2 and 3 are placed on each of the water pipe blocks 21 and 22, electromagnetic magnets 30 and 31 for magnetically attracting and fixing the molds 2 and 3 and a positioning pin 32 are provided. Is provided. The holes 12a on the front surface of the spacer block 12 are holes for letting out the pins when a three-plate type mold is mounted.

Further, the holders 7 and 8 have molds 2 and 3, respectively.
Holder grooves 14, 15 into which the protruding portions 16, 17 of
Limit switches 36, 3 for identifying the type of the attached mold are provided near the upper opening (three places in this embodiment).
7, 38 are arranged. The projecting direction dimensions of the projecting portions 16 and 17 are changed according to the type of the mold, and the limit switch 36 when the mold is mounted on the holders 7 and 8,
The mold type can be identified by the detection signals from 37 and 38 (details will be described later). In addition, the holder groove 14,
As shown in FIGS. 3 and 4, a taper 40 is cut in the vicinity of the upper end portions of the lock blocks 10 and 13 forming 15 as shown in FIGS. 3 and 4. Further, the mounting plate 9 of the fixed holder 7 has an opening 9 facing the nozzle of the injection device.
a and a mounting hole 9b for mounting to the molding machine, the mounting plate 11 of the holder 8 on the moving side has an opening 11a facing the ejector rod for ejecting a molded product and the mounting hole 11 for mounting to the molding machine.
b is provided. Heat insulating plates 9c and 11c are attached to the outer surfaces of the mounting plates 9 and 11 (FIG. 6).

First and second cylinders 41 and 42 are provided on both left and right sides of the movable holder 8 as a mechanism (driving means) for driving the slide core of the mold. The first cylinder 41 is for driving the slide core,
A connecting portion 43 with the slide core is provided at the tip of the drive lever 41a. The second cylinder 42 is for moving the entire drive mechanism including the first cylinder 41 to an appropriate position according to the type of mold. That is, as can be seen from FIGS. 2, 4 and 5, the first cylinder 41 is mounted on the cylinder mounting plate 45, and the cylinder mounting plate 45 is guided by the rod 47 fixed to the holder 8 side by the linear bush 46. , Can be moved within a predetermined range. The second cylinder 42 is attached to a mounting plate 48 fixed to the holder 8 side, and moves the cylinder mounting plate 45 to which the first cylinder 41 is mounted.

Next, regarding the structures of the mold 2 and the mold 3,
This will be described with reference to FIGS. The mold 2 is composed of a stationary side mold plate 2a, a mold body 2b, a mold body base 2c and a receiving plate 2d, and the mold 3 is similarly composed of a moving side mold plate 3a and a mold body 3a.
b, a mold body base 3c, and a receiving plate 3d, and the respective parts are integrally fixed by bolts or the like. The facing parting surfaces P of the respective mold bodies 2b and 3b of the molds 2 and 3
A cavity 4 in which a molded product is molded is provided in L, and a mold body 2b of the mold 2 is provided with a runner 52 for injecting a molding material from a nozzle of an injection device in the cavity 4, and the molds 2, 3 A water pipe 53 is provided on the template plates 2a and 3a. Further, the mold 3 has a slide core 55 (55a, 5a, 5a, 5a, 5a, 5) which is a split mold for removing the undercut of the molded product.
5b) is provided, a lever 55c is connected to the slide core 55, and a tip end portion of the lever 55c is a connecting portion 43 that engages with the drive lever 41a of the first cylinder 41. The slide core driving mechanism is provided on the holder 8 at both left and right sides.

The connecting portion 43 is substantially L-shaped in a top view so as to engage with each other in the driving direction. The molds 2 and 3 are mounted by being inserted into the holders 7 and 8 from above, so that the connecting portion 43 can be engaged with one touch. Here, the opening direction of the parting surfaces of the molds 2 and 3 and the moving direction of the slide core 55 are orthogonal to each other. Further, the position of the parting surface differs depending on the type of mold, and therefore the position of the slide core 55 also differs, but the drive lever 41a of the first cylinder 41 has the second cylinder 42 so as to correspond to each mold type. Be moved by. Further, the mold 3 is provided with ejector plate upper and lower parts 5a and 5b for ejecting a molded product guided by a guide 5c, and a return pin 5e fitted with a spring 5d for biasing in the returning direction (( Illustration is omitted in FIG. 5.) The ejected plate upper and lower parts 5a, 5b are projected in a lot (not shown) so that the molded product is projected by a projecting pin (not shown).

The molds 2 and 3 are positioned when the parting surface is closed by fitting the tips of the guide pins 57 fixed to the mold 3 into the holes of the guide bushes 58 of the mold 2. Done. Also, according to the type of mold, molds 2, 3
The lengths of the projecting portions 16 and 17 of the receiving plates 2d and 3d from the center are changed to x and x + α as shown in FIG. 6, and the molds 2 and 3 are attached to the holders 7 and 8. At this time, the mold type can be identified from the detection signals of the limit switches 36, 37 and 38 described above.
Further, as shown in FIGS. 7 and 8, a pipe 59 for connecting the water pipes 53 and returning the circulating water and a grip 60 for mounting work are attached to the upper surfaces of the molds 2 and 3, and the bottom surface is attached to the bottom surface. Water pipe openings and positioning holes corresponding to the connection ports 27 and 28 of the water pipe blocks 21 and 22 and the positioning pins 32 are provided. Further, the parting surfaces of the molds 2 and 3 are shaped so that the concavities and convexities do not interfere with each other, and moreover, a lock for preventing the slide core 55 from moving outward due to injection pressure during molding. Projection 6
1 is provided in the mold 2.

Next, referring to FIGS. 9, 10 and 11,
Several types of molds will be described, and in addition, the point that the mold types can be identified by the limit switches 36, 37, 38 (see FIG. 2) described above will be described. FIG. 9 is a two-plate type mold having a slide core, and FIG.
Is a two-plate type mold having no slide core, and FIG. 11 is a three-plate type mold having no slide core. In each figure, (a) is a method of ejecting a molded product with an ejector pin, (B) shows a system in which a molded product is surface-projected by a stripper plate 3f. Then, depending on the type of the mold, the dimensions from the center side of the receiving plate 2d to both ends are x and x + α, x and x, as shown in the figure.
x + α and x are different, and due to this difference, the limit switches 36, 37, 38 (these are the LS
1, LS2, LS3) are different in the on / off state, and with this, it is possible to identify the mold. The molds have the same overall length, but the lengths y1 and y from the receiving plate 2d to the parting surface PL are different depending on the type.
2 and y3 are different. In addition to the drawings, there is also a 3-plate type mold having a slide core. In this embodiment, the following settings are made.

[0017]

[Table 1]

The following various controls can be performed as the molding apparatus by using the signal for identifying the mold type as described above. (1) Cylinders 41, 4 so that the connecting portion 43 of the slide core 55 is moved to a predetermined position according to the mold.
2 can be drive-controlled. (2) Water pipe block 2
Cylinder 2 so that 1 and 22 are moved to a predetermined position.
5, 26 can be drive-controlled. (3) Interlock control or the like for preventing contact between the slide core 55 and the ejecting pin when the ejector operates can be performed. The sensor for identifying the mold type is not limited to the limit switch, and a micro switch, a proximity switch, or another sensor can be used.

In the 3-plate mold shown in FIG. 11, a part of the mold 2 on the fixed side 2g is movable so that the molding material of the runner part can be removed. In order to open the mold, the mold 2g moves together with the movable mold 3, first the parting of the runner is opened, and then the parting between the mold 2g and the moving mold 3 is performed. I try to open the face.

Further, the slide core drive mechanism of this embodiment can be applied to a mold having a stripper plate with a surface protrusion as shown in FIG. 9A, and the operation in this case is shown in FIG. ing. The opening / closing operation of the mold when taking out the molded product 62 is performed by opening the mold, that is, opening the stripper plate 3f and the mold plate 2a, and moving the slide core 55.
Is pulled out (retracted) through the connecting portion 43 by the operation of the cylinder 41, and the ejector plates 5a and 5b are pushed. As a result, the pin 63 comes off the molded product 62, and the molded product falls due to its own weight. After that, the ejector plates 5a and 5b are returned, the slide core 55 is advanced, and the mold is closed. Since the connecting portion 43 is L-shaped in a top view, it does not hinder the above operation.

The injection molding die is divided into four types according to the opening / closing operation. This is shown in FIGS. 13 is a 2 plate type (side gate), and FIG. 14 is 3
Plate type (pin gate), FIG. 15 is stripper plate type (side gate, surface protrusion), FIG.
Is a 4-plate type (pin gate / surface protrusion). In both figures, (a) shows the mold closed, and (b) shows the mold opened to take out the molded product and runner. , The left side is the moving side (ejector side), the right side is the fixed side (injection device side), and PL indicates the parting surface. It should be noted that the pins visible when the mold is opened are in a relationship of fitting at different positions in the mold.

As described above, the water pipe blocks 21 and 22 are provided on the fixed and movable holders 7 and 8 movably in the opening direction of the parting surface. This structure is shown in FIGS. The description will be made with reference to FIG. A rod 24 is fixed to the water pipe block 22 in parallel with the direction, and the water pipe block 22 is made movable by inserting the rod 24 into a linear bush 64 provided in the holder 8. As described above, the hose (water pipe) 65 for circulating cooling water to the mold is connected to the water pipe block 22 by a coupler, and the connection ports 27 and 28 with the mold have a ring as shown in FIG. A water-leakage-proof packing member 29 made of heat-resistant silicone rubber or the like and having a large cross-section in the height direction is fitted. Further, the water pipe block 22 is provided with an electromagnetic magnet 31 for magnetically attracting the placed mold 3.

By adopting such a construction of the water pipe blocks 21 and 22, the water pipe connection can be easily carried out by inserting the molds into the holders 6 (7, 8) for all the above-mentioned various molds. It is possible and water leakage does not occur. 20 (a) and 20 (b) show an example of the connection configuration around the water tube blocks 21 and 22 in the case of the mold of the type shown in FIG.

Next, the ejection structure of a molded product by the ejector lot and its operation will be described with reference to FIGS. 21 (a) and 21 (b). When the cassette-type mold unit 1 is set in the fixed-side and movable-side holders 7 and 8, due to the existence of the set clearance, the entire unit is slightly inclined due to its weight. In this embodiment, the tip end portion of the ejector lot 67, which is projected from the die plate 66 of the molding machine and projects on the back side of the ejector plate, has a curvature (R).
5 or more). The tip of the lot 67 is made to project near the center on the back side of the ejector plate 5b, and the tip moves while sliding on the back of the ejector plate 5b as the ejector plate 5b moves at the time of protrusion. As a result, conventionally, as shown in FIG. 22, since the sliding direction of the ejector plate 5b and the protruding direction of the ejector lot 68 are different, an unreasonable force is applied to the contact point between the ejector plate 5b and the ejector lot 68. However, this is not the case in this embodiment.

Next, an air purge structure for replacing the mold in this apparatus will be described with reference to FIG. As described above, the cooling water is circulated in the mold, but this apparatus is equipped with the temperature controller 71 for adjusting the temperature of the cooling water. The mold unit 1 is communicated with the mold unit 1 by a water circuit 72.
A solenoid valve unit 73 for opening and closing the circuit is arranged in the middle of 2. The solenoid valve unit 73 drains water from the water pipe on the die side before detaching the die when exchanging the die with the first and second solenoid valves V1 and V2 provided in the reciprocating path of the water circuit 72. For this purpose, an air compressor 74 for supplying air, a third electromagnetic valve V3 for controlling the supply of air, and a fourth electromagnetic valve V4 for opening the water circuit on the die side to the atmosphere are provided.

The water draining operation is the first during the molding.
And only the second solenoid valves V1 and V2 are opened, and the third solenoid valve V is opened for a predetermined time set by a timer or the like when exchanging the mold.
3 is opened and air is supplied from the air compressor 74 into the water pipe on the die side to push the water in the water pipe on the die side to the temperature adjuster 7 side to perform air purging. After that, the first, second, and third solenoid valves V1, V2, V3 are closed, and the fourth solenoid valve V
Open only 4 to open to the atmosphere, and replace the mold in this state. After that, the state at the time of molding may be used. This operation is automatically performed by switching the power supply of the temperature regulator 71 from OFF to ON after the molding operation is completed. By adopting such a configuration, in the case where the solenoid valve unit is not provided as shown in FIG. 24, water overflows when the mold is removed from the holder when the mold is replaced,
The surrounding area was sometimes submerged in water, but such a situation was prevented, and by opening to atmospheric pressure, compressed air containing water would not be blown out, and mold replacement could be done easily. become. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0027]

As described above, according to the invention of claim 1,
When changing the mold, operate the circuit opening / closing solenoid valve, the air supply source, and the air supply solenoid valve that controls the supply to supply air into the water circuit on the mold side to drain water from the circuit. As a result, the water in the water circuit on the mold side can be easily drained, and even if the mold is removed to replace the mold, water will not overflow into the surrounding area. Work becomes easy. According to the second aspect of the present invention, in addition to the above-mentioned operation, the air supply solenoid valve is opened to supply air into the water circuit on the mold side from the air supply source, and the circuit opening / closing solenoid valve is closed. Since the solenoid valve for opening to the atmosphere is opened, compressed air containing water will not be ejected when the mold is removed.

[Brief description of drawings]

FIG. 1 is a view conceptually showing a cassette-type mold unit and its holder, which are main components of the device of the present invention.

FIG. 2 is a plan view of a holder that holds a mold unit according to this embodiment.

FIG. 3 is a side view taken along arrow A in FIG.

FIG. 4 is a side view taken along the arrow B of FIG.

FIG. 5 is a plan view showing a driving mechanism of a fixed core and a movable mold and a slide core.

FIG. 6 is a plan view of an essential part with a mold attached to a holder.

FIG. 7 is a perspective view of a parting surface of the mold 2.

FIG. 8 is a perspective view of a parting surface of the mold 3.

FIG. 9 is a diagram showing an example of various types of molds.

FIG. 10 is a diagram showing an example of various types of molds.

FIG. 11 is a diagram showing an example of various types of molds.

FIG. 12 is a diagram showing an example in which a slide core drive mechanism is applied to a mold having a stripper plate.

FIG. 13 is a view showing an example of a type of injection molding die.

FIG. 14 is a diagram showing an example of a type of injection molding die.

FIG. 15 is a diagram showing an example of a type of injection molding die.

FIG. 16 is a diagram showing an example of a type of injection molding die.

FIG. 17 is a side view showing a structure in which a water tube block is provided on a holder on the moving side.

FIG. 18 is a perspective view of a water tube block.

FIG. 19 is a perspective view and a cross-sectional view showing a packing member for preventing water leakage.

FIG. 20 is a diagram showing a connection configuration example around a water tube block of a mold of the type shown in FIG. 16;

FIG. 21 is a diagram showing a protruding structure of a molded product by the ejector lot of the present embodiment.

FIG. 22 is a view showing a protruding structure of a molded product by a conventional ejector lot.

FIG. 23 is a diagram showing an air purge configuration for mold replacement according to the present embodiment.

FIG. 24 is a view showing a conventional air purge configuration for mold replacement.

[Explanation of symbols]

 1 Cassette type mold unit 2 Fixed side mold 3 Moving side mold 6 Holder 21, 22 Water pipe block 27, 28 Connection port 65 Hose (water pipe) 71 Temperature controller 72 Water circuit 73 Solenoid valve unit 74 Air compressor V1 First solenoid valve (circuit opening / closing solenoid valve) V2 Second solenoid valve (circuit opening / closing solenoid valve) V3 Third solenoid valve (air supply solenoid valve) V4 Fourth solenoid valve (atmosphere opening solenoid) valve)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Muraoka 3-20-16 Kamishinjo, Higashiyodogawa-ku, Osaka City Komatsu Wright Manufacturing Co., Ltd. (72) Yuto Fujii 3-20-16 Kamishinjo, Higashiyodogawa-ku, Osaka Komatsu Light Manufacturing Co., Ltd.

Claims (2)

[Claims] 1. A mold apparatus for injection molding, comprising: a detachable cassette-type mold; and a temperature controller that circulates and supplies cooling water to the mold through a water circuit and adjusts its temperature. A solenoid valve for opening and closing a circuit provided in a water circuit for opening and closing the circuit, an air supply source for supplying air to drain water in the water circuit on the mold side before removing the mold at the time of mold replacement, and its An injection molding die apparatus comprising: an air supply solenoid valve for controlling supply. 2. An air release solenoid valve for opening the water circuit to the atmosphere is provided, and the air supply solenoid valve is opened to replace air in the water circuit on the die side of the air supply source when the die is replaced. The electromagnetic valve for opening / closing the circuit and the electromagnetic valve for opening to the atmosphere are opened after the water in the water circuit is pushed out to the temperature regulator side by supplying the water. The injection molding die apparatus described.