JP3114161B2 - Mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus used for molding with a resin, and more particularly, to a release mechanism for a solidified resin.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, between a fixed mold member 1 and a movable mold member 2 which are clamped, a product-shaped cavity 3, a runner 4, and a 4
There is known an injection molding die apparatus for forming a side gate 5 which is a secondary gate which communicates with a cavity 3. The fixed mold member 1 and the movable mold member 2 move in directions indicated by solid arrows A and B, respectively, when the mold is opened. In addition, the fixed mold member 1 includes:
A bush 7 with a built-in spear 6 is embedded,
A direct gate 8 which is a primary gate opening to the runner 4 is formed at a lower end of the bush 7 in the drawing. Further, a product protruding pin 9 is incorporated in the movable mold member 2 so as to move up and down so as to face the cavity 3, and a runner protruding pin 10 is built so as to move up and down so as to face the runner 4. ing. Further, the movable mold member 2 is formed with a truncated cone-shaped recess 11 facing the runner 4 so as to make an undercut in the moving direction of the movable mold member 2 when the mold is opened.
Runner protruding pin 10 faces 11. Although not shown, these protruding pins 9 and 10 are operated by being pushed by a protruding rod of the main body of the injection molding machine.
At the time of molding, the resin P flows into the cavity 3 from the inside of the bush 7 via the direct gate 8, the runner 4 and the side gate 5 in a mold-clamped state.
After the resin P filled in the cavity 3 is solidified, the mold is opened. At this time, first, due to the undercut shape of the resin P solidified in the concave portion 11, the resin P solidified in the runner 4 and the cavity 3 stops on the movable mold member 2 side, and the fixed mold member 1 Move away from At the same time, the resin P solidified in the cavity 3, that is, the product, is protruded from the movable mold member 2 and released from the movable mold member 2 by the product ejection pin 9 which rises relative to the movable mold member 2. At this time, the protrusion operation by the runner protrusion pin 10 is also performed at the same time, and the runner protrusion pin 10
Rises up relative to the movable mold member 2 as shown
The resin P solidified in the runner 4 is released from the movable mold member 2 while forcibly removing the resin P solidified in 11.
As described above, in the side gate type mold device,
It is common to release the resin P solidified in the product and the runner 4 by forming an undercut concave portion 11 facing the runner 4 and projecting it with the product projecting pin 9 and the runner projecting pin 10. It is a target. By the way, depending on the product shape, a slide core that moves in a direction indicated by a chain line arrow C is incorporated into the movable mold member. When the slide core is incorporated in this way, the entire runner may need to be formed between the fixed mold member and the slide core. However, when the entire runner is formed between the fixed mold member and the slide core as described above, it is impossible to release the resin solidified in the runner by the protruding pins as described above. .

Conventionally, a projecting member forming a part of a runner is incorporated in a fixed mold member so as to be movable within a predetermined range in the opening and closing direction between the fixed mold member and the movable mold member. There is also a mold apparatus that is biased toward a mold member. In this mold apparatus, when the mold is clamped, the protruding member retreats to the fixed mold member side against the bias of the spring. The resin moves toward the movable mold member relatively to the mold member, and releases the resin solidified in the runner.
However, if a dedicated protruding member and a spring as described above are used to release the resin solidified in the runner, the mold structure becomes complicated.

[0004]

As described above, as described above,
In a side gate type mold apparatus, an undercut-shaped recess is formed facing the runner, and the product and the resin that has solidified in the runner are released by projecting with the product ejection pin and the runner ejection pin. However, this is not possible when the entire runner is formed between the fixed mold member and the slide core. Further, when a dedicated protruding member and a spring are incorporated in the fixed mold member to release the resin solidified in the runner, there is a problem that the mold structure becomes complicated.

The present invention is intended to solve such a problem. In a side gate type mold apparatus in which the entire runner is formed between a fixed mold member and a slide core, a simple structure is provided. Therefore, it is an object of the present invention to release a resin solidified in a runner.

[0006]

In order to achieve the above object, the present invention provides a fixed mold member, a movable mold member which can be opened and closed with respect to the fixed mold member, and a movable mold member. A mold member having a slide core movably supported in a direction different from the opening / closing direction thereof, wherein a cavity is formed between the fixed mold member, the movable mold member, and the slide core; In a mold apparatus for forming a runner communicating with the cavity via a side gate between a side mold member and a slide core, a recess is formed in the slide core so as to face the runner. A first inclined portion that makes an undercut with respect to the moving direction of the movable mold member when the mold is opened, and gradually moves away from the fixed mold member toward the moving direction of the slide core when the mold is opened And has a second inclined portion inclined to the direction.

[0007]

In the mold apparatus of the present invention, at the time of molding, the fixed-side mold member, the movable-side mold member, and the slide core are formed between the fixed-side mold member and the slide core while the mold is clamped. The resin is poured into the cavity formed between the fixed mold member, the movable mold member, and the slide core from the runner through the side gate. Then, after the resin filled in the cavity from the runner is solidified, the mold is opened. At this time, when the fixed mold member, the movable mold member, and the slide core are first mold-opened, the resin solidified in the concave portion of the slide core facing the runner is filled with the movable mold member at the time of mold opening. Since the first inclined portion has an undercut in the moving direction, the resin solidified in the runner stops at the slide core and separates from the fixed mold member. Next, when the slide core is moved relative to the movable mold member, the slide core causes the resin solidified in the recess to gradually move from the fixed mold member toward the moving direction of the slide core when the mold is opened. Since there is a second inclined portion inclined in a direction away from the resin, the resin solidified in the runner rises from the slide core and is released from the slide core by the guidance of the second inclined portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the mold apparatus according to the present invention will be described below with reference to FIGS. Reference numeral 21 denotes a fixed mold member, and reference numeral 22 denotes a movable mold member. The two mold members 21, 22 move relatively vertically in FIGS. 1 to 4 and open and close. A slide core 23 is supported by the movable mold member 22 so as to be movable in the left-right direction in the figure. At the time of mold clamping, these fixed-side mold members 21
A cavity 24 having a product shape is formed between the movable mold member 22 and the slide core 23. The product has a shape that is undercut in the mold opening direction of the fixed mold member 21 and the movable mold member 22. For this purpose, a slide core 23 is provided. There are a pair of members 23 that move in the opposite directions to one cavity 24 when the mold is clamped and the mold is opened. Then, the two mold members 21 and 22 are fixed to the fixed mold member 21.
An angular pin 25 inclined with respect to the opening / closing direction is slidably inserted into a through hole 26 formed in the slide core 23, thereby interlocking with the opening / closing of the two mold members 21, 22.
The slide core 23 moves. The diameter of the through hole 26 is slightly larger than that of the angular pin 25, and a gap is provided between the outer peripheral surface of the angular pin 25 and the inner peripheral surface of the through hole 26 on the right side in the drawing at the time of mold clamping. 26a occurs. Further, at the time of mold clamping, a runner 27 is formed between the fixed mold member 21, the movable mold member 22, and the slide core 23, and is a secondary gate for communicating the runner 27 with the cavity 24. Side gate
28 are formed. A recess 29 is formed in the slide core 23 so as to face the runner 27. The concave portion 29 has an obtuse triangular side surface, and the right side surface in the drawing has a first inclined portion 30 which forms an undercut with respect to the moving direction of the movable mold member 22 when the mold is opened. In addition, the left side surface in the figure becomes a second inclined portion 31 which is gradually inclined to the right, that is, in the direction of movement of the slide core 23 when the mold is opened, gradually away from the fixed mold member 21. ing.

Although not shown, the fixed-side mold member 21 is provided via a receiving plate and a spacer block.
It is attached to a fixed-side attachment plate for attachment to the injection molding machine body. On this fixed side mounting plate,
There is a sprue bush to which the nozzle of the injection molding machine is connected. The sprue communicates with the fixed-side mold member 21 and the bush 36 embedded in the receiving plate via a runner of the manifold. This bush 36 has a built-in spear 37 and a direct gate 38 as a primary gate opening to the runner 27 at the lower end in the figure. On the other hand, the movable mold member 22 is attached to a movable attachment plate 43 for attachment to an injection molding machine main body via a receiving plate 41 and a spacer block 42. A protruding plate 44 is fixed between the receiving plate 41, the spacer block 42, and the movable mounting plate 43 so as to be vertically movable relative to these. The protruding plate 44 is pushed by a protruding rod of the main body of the injection molding machine and rises in the figure. A projecting pin 45 is fixed to the projecting plate 44. These protruding pins 45 slidably penetrate the receiving plate 41 and the movable-side mold member 22, and the upper end in the figure faces the cavity 24. Note that the protruding pin 45 passes by the side of the slide core 23 and does not interfere with the slide core 23.

Next, the operation of the above configuration will be described. At the time of injection molding, as shown in FIG. 1, first, the molten resin P is injected from a nozzle of an injection molding machine main body with the fixed mold member 21, the movable mold member 22, and the slide core 23 clamped. Let it. The resin P is supplied from a bush 36 with a built-in spear 37 to a direct gate 38, a runner
It flows into cavity 24 through 27 and side gate 28. Next, after the resin P filled in the cavity 24 from the runner 27 is solidified, the mold is opened. When the mold is opened, the fixed-side mold member 21 and the movable-side mold member 22 move vertically away from each other and separate from each other.
A gap 26 is provided on the right side of the drawing between the outer peripheral surface of
2, the slide core 23 does not move with respect to the movable mold member 22 for a while from the start of the mold opening, and the movable mold member 22 and the slide core 23 do not move. The only difference is that the fixed-side mold member 21 is separated from. At this time, the concave portion in the slide core 23 facing the runner 27
The resin P solidified in the runner 27 has a first inclined portion 30 that makes an undercut in the moving direction of the movable mold member 22 when the mold is opened.
It stops at the slide core 23 and moves away from the fixed mold member 21. Further, the product which is a resin solidified in the cavity 24 also stops on the slide core 23 and the movable mold member 22 for the slide core 23. After the clearance 26a on the right side in the drawing between the outer peripheral surface of the angular pin 25 and the inner peripheral surface of the through hole 26 disappears, as shown in FIG. In conjunction with the mold opening, the movable mold member
The slide core 23 starts to move relative to 22. That is, the right slide core 23 moves rightward, and the left slide core 23 moves leftward. When the slide core 23 moves in this manner, the slide core 23 stops on the movable mold member 22 because the slide core 23 has not yet come off from the product. On the other hand, the resin P solidified in the concave portion 29 Since the second inclined portion 31 is gradually inclined in a direction away from the fixed mold member 21 toward the moving direction of the slide core 23 in the above, the solidification in the runner 27 is performed by the guide of the second inclined portion 31. Resin P lifts from slide core 23 and is released. Further, as shown in FIG. 4, after the slide core 23 comes off from the product, the protruding pin 45 starts to move up with respect to the movable mold member 22, and the product is released from the movable mold member 22.

As described above, in the above embodiment, the first inclined portion 30 is provided on the slide core 23 so as to face the runner 27.
By forming the concave portion 29 having the second inclined portion 31 and the resin, the resin P solidified in the runner 27 and the product can be released with a simple structure.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made. For example,
In the mold apparatus of the above embodiment, one cavity 24
However, the present invention can of course be applied to a mold apparatus having only one slide core for one cavity. Further, the slide core is not limited to one driven by the angular pin 25, and may be one driven by a pneumatic or hydraulic cylinder device or a spring.

[0013]

According to the present invention, a cavity is provided with a side gate in a cavity between a fixed mold member and a slide core supported by a movable mold member in a direction different from the opening / closing direction. A mold device that forms a runner that communicates with the runner, the slide core facing the runner, a first inclined portion that makes an undercut with respect to the moving direction of the movable mold member when the mold is opened, Since the concave portion having the second inclined portion gradually inclined in a direction away from the fixed-side mold member toward the moving direction of the slide core in the above, the fixed-side mold member, the movable-side mold member, and the slide core are formed. When the mold was opened, the resin solidified in the runner was separated from the fixed mold member by the first inclined portion. Then, when the slide core was moved, the resin was solidified in the runner by the second inclined portion. Fat was released from the slide core, a simple structure, is caused to release the resin solidified in the runner.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a mold apparatus according to the present invention in a mold clamped state.

FIG. 2 is a cross-sectional view showing an initial stage of opening the mold.

FIG. 3 is a cross-sectional view showing a release state of the resin solidified in the runner.

FIG. 4 is a sectional view showing a protruding state of the same product.

FIG. 5 is a plan view of a cavity and a runner portion of the same.

FIG. 6 is a sectional view showing an example of a conventional mold device.

[Explanation of symbols]

 21 Fixed mold member 22 Movable mold member 23 Slide core 24 Cavity 27 Runner 28 Side gate 29 Recess 30 First inclined portion 31 Second inclined portion

Claims (1)

(57) [Claims] 1. A fixed mold member, a movable mold member that can be opened and closed with respect to the fixed mold member, and a movable mold member that is supported by the movable mold member in a direction different from the opening and closing direction. A slide core, a cavity is formed between the fixed mold member, the movable mold member and the slide core, and a side gate is formed in the cavity between the fixed mold member and the slide core. In a mold apparatus that forms a runner that communicates with the mold, a recess is formed in the slide core so as to face the runner, and the recess is formed with respect to the moving direction of the movable mold member when the mold is opened. A first inclined portion forming an undercut; and a second inclined portion gradually inclined in a direction away from the fixed mold member toward a moving direction of the slide core when the mold is opened. Mold equipment.