JPH05154847A - Mold device - Google Patents

Abstract

PURPOSE:To surely return an ejection element to the initial position prior to the completion of mold clamping. CONSTITUTION:A slide core 30 is used at the time of molding and a molded product B is ejected by a stripper plate 40. The return pin receiver 44 coming into contact with a return pin 42 is provided to a fixed mold body 21. The pressure pin 46 coming into contact with the return pin 42 is combined with the return pin receiver 44 so as to be movable in the opening and closing direction of mold bodies 21, 22 and energized to the movable mold body 22 by a spring 48. By pushing the return pin 42 by the pressure pin 36 protruding from the return pin receiver 44, the stripper plate 40 returns to the initial position at the time of molding prior to the completion of mold clamping. Thereafter, the slide core 30 begins to ride on the stripper plate 40. By this constitution, the slide core 30 is not hooked with the stripper plate 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device, and more particularly to a molding product ejecting mechanism.

[0002]

2. Description of the Related Art An example of a conventional mold apparatus having a mechanism for ejecting a molded product will be described with reference to FIGS. In the figure, 1 is a fixed-side mold body, 2 is a movable-side mold body,
These mold bodies 1 and 2 relatively move in the vertical direction in the drawing to open and close. A cavity 3 is formed between the mold bodies 1 and 2 when the mold is clamped. The fixed-side mold body 1 includes a cavity member 4 that forms a cavity 3, a fixed-side mounting plate fixed to the upper side of the cavity member 4 in the drawing through a spacer block, a manifold, and the like. It consists of On the other hand, the movable-side mold body 2 is composed of a core member 6 forming a cavity 3, a movable-side mounting plate 8 fixed to a lower side of the core member 6 in the drawing through a spacer block 7, and the like. .. Further, a protruding body 9 for protruding the molded product A toward the fixed side mold body 1 is movably assembled to the movable side mold body 2 in the vertical direction in the drawing. The protruding body 9 is supported by the core member 6, the spacer block 7, and the movable side mounting plate 8 so as to be vertically movable in the figure, and one end portion is fixed to the protruding plates 10 and 11. And a protruding pin 12 that penetrates the core member 6 slidably and has its tip facing the cavity 3. In addition, a return pin 13 whose one end is fixed to the protruding plates 10 and 11
Penetrates the core member 6 slidably. The return pin 13 is located between the core member 6 and the protruding plate 10.
The return spring 14 wound around the
10 and 11 are urged downward in the drawing. On the other hand, a pin-shaped return pin receiver 15 coaxially abutting the return pin 13 is fixed to the fixed-side mold body 1 by a bolt 16.

When molding, as shown in FIG. 4, first, the fixed side mold body 1 and the movable side mold body 2 are clamped. In this state, the cavity 3 is formed between the cavity member 3 of the fixed-side mold body 1 and the core member 6 of the movable-side mold body 2. Also, the return pin receiver on the fixed side mold body 1 side
By pushing the return pin 13 by 15, the ejector plate 10,
11 is lowered in the figure, and the tip of the protruding pin 12 is positioned so as to form a part of the cavity surface. In such a mold clamping state, molten plastic is poured into the cavity 3. Then, after the plastic with which the cavity 3 is filled is solidified, the fixed-side mold body 1 and the movable-side mold body 2 are opened as shown in FIG. With this mold opening, first, the cavity member 4 of the fixed-side mold body 1 separates from the molded product A. Then, the ejection plates of the injection molding machine (not shown) push the ejection plates 10 and 11 against the urging force of the return spring 14 to move upward relative to the movable mold body 2 to eject the ejection plates. The molded product A is projected toward the fixed-side mold body 1 by the protruding pin 12 that is integrally raised with the 10, 10 and is separated from the core member 6 of the movable-side mold body 2. Then, after the molded product A is taken out, the mold is clamped again. With this mold clamping, the biasing of the return spring 14 causes the ejecting plates 10 and 11 together with the ejecting rod to move relative to the movable mold body 2. The figure descends. The biasing of the return spring 14 does not always return the ejecting plates 10 and 11 and the ejecting pin 12 to the initial position at the time of molding shown in FIG. 1, but the return pin receiver 15 on the fixed side mold body 1 side returns. By pushing the pin 13, the ejecting plates 10 and 11 and the ejecting pin 12 are surely returned to the initial positions at the time of molding shown in FIG.

[0004]

However, in the ejection mechanism of the above-mentioned conventional mold apparatus, the return pin receiver 15 fixed to the fixed mold body 1 side causes the ejector body 9 on the movable mold body 2 side to move to the ejected body 9. Since the ejector body 9 is returned by pushing the fixed return pin 13, the ejector body 9 is surely positioned at the initial position at the time of molding only after the mold clamping between the fixed-side mold body 1 and the movable-side mold body 2 is completed. Will return to. By the way, for example, in the movable mold body, while assembling a slide core that moves in a direction orthogonal to the opening / closing direction of the movable mold body and the fixed side mold body, a stripper plate is used for the protruding body that protrudes the molded product, and In the case where the slide core slides on this stripper plate, if the stripper plate is not surely returned to the initial position prior to completion of mold clamping, the slide core will be caught in this stripper plate, It may interfere with the operation of the slide core. Therefore, in such a case, it is a problem to surely return the stripper plate to the initial position before the completion of the mold clamping.

The present invention is intended to solve such a problem, and prior to completion of mold clamping between the fixed side mold body and the movable side mold body, the protruding body is surely set to the initial position at the time of molding. An object is to provide a mold device that can be returned.

[0006]

In order to achieve the above-mentioned object, a mold apparatus of the present invention is capable of opening and closing a fixed-side mold body and a movable-side mold body, and a double-molded mold for the movable-side mold body. A protruding member that movably assembles in the opening and closing direction of the mold body and that molds between the mold bodies and protrudes toward the fixed-side mold body; and a return pin that is integrally provided on the protrusion body, and A return pin receiver which is integrally provided on the fixed-side mold body and abuts on the return pin; and a pressing pin which is movably assembled to the return pin receiver in the opening / closing direction of both mold bodies and abuts on the return pin, And a spring for urging the pressing pin toward the movable-side mold body.

[0007]

In the mold apparatus of the present invention, during molding, plastic is filled between the fixed mold body and the movable mold body that have been clamped, and after the filled plastic has solidified,
The fixed-side mold body and the movable-side mold body are opened, but with this mold opening, the protruding body moves toward the fixed-side mold body relative to the movable-side mold body, fixing the molded product. Stick out towards the side mold. Then, after the molded product is taken out, the mold is clamped again, but with this mold clamping, the pressing pin assembled to the return pin receiver on the fixed side mold body side is replaced with the return pin integrally provided on the protruding body. By pushing, the protruding body moves in the direction opposite to the fixed-side mold body with respect to the movable-side mold body. At this time, the pressing pin is movably assembled to the return pin receiver in the opening / closing direction of both mold bodies, and is biased toward the movable mold body by the spring, so that the mold clamping is completed. Prior to this, the protruding body returns to the initial position at the time of molding, and thereafter, the pressing pin moves in the direction opposite to the movable side mold body with respect to the return pin receiver against the bias of the spring. When the mold clamping is completed, the return pin receiver provided integrally with the fixed-side mold body contacts the return pin.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the mold apparatus of the present invention will be described below with reference to FIGS. In the figure, B is a plastic molded product, and this molded product B has a box-like shape with an open lower surface in the figure, and has a hole B1 in the side surface portion and a flange portion B2 in the lower end portion. There is. Also, 21
Is a fixed-side mold body, 22 is a movable-side mold body, and these mold bodies 2
Reference numerals 1 and 22 are for relatively moving in the vertical direction in the drawing to open and close. When the mold is clamped, a cavity 23 having the shape of the molded product B is formed between the mold bodies 21 and 22. The fixed-side mold body 21 includes a cavity member 24 forming a cavity 23, a receiving plate 25 fixed to the upper side of the cavity member 24 in the drawing, and a spacer not shown in the upper side of the receiving plate 25. It is composed of a fixed side mounting plate fixed via a block and mounted on a fixed side platen of the injection molding machine, a manifold provided between the fixed side mounting plate and the receiving plate 25, and the like. On the other hand, the movable mold member 22 includes a core member 26 forming a cavity 23 and a receiving plate fixed to the lower side of the core member 26 in the drawing.
27, and a movable side attachment plate 29 fixed to the lower side of the receiving plate 27 via a spacer block 28 and attached to the movable platen of the injection molding machine. A slide core 30 for forming the hole B1 of the molded product B is assembled on the core member 26 so as to be movable in the horizontal direction in the drawing. In order to operate the slide core 30 in conjunction with mold clamping and mold opening, the angular pin 31 fixed to the fixed mold body 21 and inclined downward in the direction away from the cavity 23 in the drawing is used as the slide core 30. It is slidably inserted in the inclined hole 32 formed in.

Further, the movable side mold body 22 has a molded product B
A protruding body 36 that protrudes toward the fixed-side mold body 21 is movably assembled in the vertical direction in the drawing. This protruding body 36
Is a protruding plate 3 which is supported between the receiving plate 27, the spacer block 28, and the movable side mounting plate 22 so as to be vertically movable in the figure.
7, 38 and a plurality of protrusion pins whose one end is fixed to the protrusion plates 37, 38 and slidably penetrates through the core member 26.
39 and so on. And these protruding pins
A stripper plate 40, which forms a portion corresponding to the lower surface of the flange portion B2 of the molded product B in the cavity 23 in the figure, is fixed to the upper end portion of 39 in the figure. The stripper plate 40 is for ensuring a sufficient protruding area. The protrusion plates 37, 38 are restricted from moving downward in the figure with respect to the movable mold body 22 by a stopper 41 provided on one of the facing surfaces of the protrusion plate 38 and the movable mounting plate 29. It has become so. A return pin 42, one end of which is fixed to the protruding plates 37 and 38, slidably penetrates through the core member 26. Then, by the return spring 43 which is located between the core member 26 and the protruding plate 37 and wound around the return pin 42, the protruding plates 37 and 38 are urged downward in the drawing. on the other hand,
A return pin receiver 44 is fixed to the fixed-side mold body 21 so that the lower end surface in the drawing coaxially abuts the upper end surface in the drawing of the return pin 42 when the mold is clamped. This return pin receiver 44
Has a cylindrical shape, but the inner circumference of the lower end in the figure
It is 45. A pressing pin 46 is assembled in the return pin receiver 44 so as to be movable in the vertical direction in the figure. The pressing pin 46 slidably penetrates the small diameter portion 45 of the return pin receiver 44, and the lower end surface in the drawing protruding from the small diameter portion 45 coaxially contacts the upper end surface in the drawing of the return pin 42. It comes into contact. The pressing pin 46 is
The return pin receiver 44 is prevented from coming off by a flange portion 47 formed at the upper end of the drawing. A spring 48, which is a spring, is provided in the return pin receiver 44 located between the receiving plate 25 and the flange portion 47 of the pressing pin 46.
The spring 48 holds the push pin.
46 is urged downward in the drawing, that is, toward the movable mold body 22. Reference numeral 49 is an ejecting rod of the injection molding machine, and the ejecting rod 49 penetrates through a through hole 50 formed in the movable side mounting plate 29 and ejects the ejecting plates 36 and 37 upward in the drawing.

Next, the operation of the above configuration will be described. At the time of molding, as shown in FIG. 1, first, the fixed side mold body 21 and the movable side mold body 22 are clamped. In this state, the cavity member 24 of the fixed-side mold body 21 and the movable-side mold body 21
A cavity 23 is formed between the core member 26 of 22 and the slide core 30. Further, the return pin receiver 44 on the fixed-side mold body 21 side abuts the return pin 42, so that the protruding plates 37 and 38 are held in the lower position shown in the drawing, and the stripper plate 40 forms a part of the cavity surface. Located in. In such a mold clamping state, molten plastic is poured into the cavity 23. Then, after the plastic filled in the cavity 23 is solidified,
As shown in, the fixed-side mold body 21 and the movable-side mold body 22 are opened. With this mold opening, first, the cavity member 24 of the fixed-side mold body 21 separates from the molded product B. At the same time, the angular pin 31 of the fixed-side mold body 21 is pulled out from the inclined hole 32 of the slide core 30, so that the slide core 30
Slides horizontally on the core member 26 of the movable-side mold body 22 in the figure to separate from the molded product B and then to exit from the hole B1. Then, the slide core 30 is sufficiently removed from the molded product B, that is, the molded product B.
3, the ejection rod 49 of the injection molding machine begins to eject the ejection plates 37 and 38 toward the upper side in the drawing, that is, toward the fixed-side mold body 21, as shown in FIG. Then, the molded product B is formed by the stripper plate 40 which is integrally raised with the ejection plates 37 and 38 in the drawing.
Is projected from the movable-side mold body 22 toward the fixed-side mold body 21, and is separated from the movable-side mold body 22. With the mold opening, the pressing pin 46 projects from the return pin receiver 44 toward the movable-side mold body 22 due to the bias of the spring 48. Then, after the molded product B released from the mold is taken out, the mold is clamped again for the next molding. At the time of this mold clamping, as the ejecting rod 49 of the injection molding machine descends in the drawing, the ejecting plates 37 and 38 are moved relative to the movable mold body 22 together with the ejecting rod 49 by the biasing of the return spring 43. The figure descends. After the mold clamping progresses to some extent, the pressing pin 46 assembled to the return pin receiver 44 on the fixed-side mold body 21 side, the push plate 46
By hitting the return pin 42 fixed to 37, 38, the return pin 42 is pushed downward in the drawing. At that time, initially, the pressing pin 46 is held at the lowest position with respect to the return pin receiver 44 by the bias of the spring 48.
In this way, when the pressing pin 46 pushes the return pin 42, the ejection plates 37 and 38 together with the return pin 42 are surely lowered relative to the movable mold body 22 in the figure. Then, as shown in FIG. 2, prior to the completion of the mold clamping, the return pin 42, the ejection plates 37, 38, the ejection pin 39 and the stripper plate 40 are attached to the movable side mold body 22.
To the lowest position, that is, the initial position at the time of molding.
Thereafter, as the mold clamping progresses, the pressing pin 46 rises in the figure relative to the return pin receiver 44 against the bias of the spring 48, and enters the return pin receiver 44. In addition, the protruding plates 37 and 38 and the stripper plate 40
From the time when was returned to the initial position at the time of molding, the angular pin
The slide core 30 starts to be inserted into the inclined hole 32 of the slide core 30, and the slide core 30 starts to move toward the stripper plate 40. As described above, when the mold clamping is completed, as shown in FIG.
44 contacts the return pin 42, and the return pin 42,
The ejection plates 37, 38, the ejection pin 39, and the stripper plate 40 are securely held at the lowest position with respect to the movable mold body 22. Further, the slide core 30 is located on the stripper plate 40.

As described above, according to the structure of the above embodiment, the pressing pin 46 is movably assembled in the return pin receiver 44 in the vertical direction in the drawing, and the pressing pin 46 is urged downward in the drawing by the spring 48. , Fixed side mold body 21 and movable side mold body
Prior to the completion of mold clamping with 22, the protruding body 36 can be reliably returned to the initial position at the time of molding. Therefore, this protruding body
When the slide core 30 starts to be placed on the stripper plate 40 of the 36, the stripper plate 40 can be surely returned to the initial position at the time of molding.
The slide core 30 is caught on 40, and this slide core
There is no risk that the operation of 30 will be disturbed.

The present invention is not limited to the above embodiment, but various modifications can be made. For example,
In the above embodiment, the mold apparatus having the stripper plate 40 and the slide core 30 has been described as an example, but the invention is not limited thereto.

[0013]

According to the present invention, the return pin receiver is provided with
The pressing pin that abuts the return pin is movably assembled in the opening / closing direction of the fixed-side mold body and the movable-side mold body, and this pressing pin is urged toward the movable-side mold body by the spring. The protruding body can be reliably returned to the initial position at the time of molding before the completion of the mold clamping between the mold body and the movable side mold body.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an intermediate stage of mold opening in the same.

FIG. 3 is a cross-sectional view showing the final stage of mold opening in the same.

FIG. 4 is a sectional view showing an example of a conventional mold device in a mold clamped state.

FIG. 5 is a cross-sectional view showing the same mold open state.

[Explanation of symbols]

 21 Fixed side mold body 22 Movable side mold body 36 Extruded body 42 Return pin 44 Return pin receiver 46 Press pin 48 Spring B Molded product

Claims (1)

[Claims] 1. A fixed-side mold body and a movable-side mold body that can be opened and closed, and a movable-side mold body that is movably assembled in the opening and closing directions of both mold bodies and is molded between these mold bodies. A protruding body that protrudes the molded product toward the fixed side mold body, a return pin integrally provided on the protruding side body, and a return pin receiver that is integrally provided on the fixed side mold body and abuts on the return pin And a pressing pin that is movably assembled to the return pin receiver in the opening and closing directions of both molds and contacts the return pin, and a spring that biases the pressing pin toward the movable mold. Mold device characterized by.