JPH0518115Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] The purpose of this invention is to provide a dual-purpose mold type that can be used for both side gate and pin gate methods. A side gate provided at a selected end of the formed runner, a pin gate provided at the other selected end of the runner, a removable side gate plug for plugging the side gate, and a removable other end for plugging the pin gate. The configuration includes a pin gate stopper.

[Industrial application field]

The present invention relates to a mold type that can be used as both a pin gate and a side gate.

In recent years, the life cycle of electronic equipment products has become shorter, and when developing new products, it is necessary to develop prototypes in a short period of time.

On the other hand, many molded products have come to be used for parts constituting products, and accordingly many molds are required. Therefore, these molds are naturally required to be delivered quickly and at low cost.

[Conventional technology]

Molds have various types of gates through which molten resin flows, depending on the shape of the product, but they can be broadly divided into two types: side gate type and pin gate type.

For example, FIGS. 4A and 4B show a part 1 molded using a pin-gate type mold.

The part 1 is molded in a state connected to a runner connected to a sprue 3 via a pin gate 2.

Furthermore, FIGS. 4D and 4C show parts 4 molded using a side gate type mold.

The part 4 is molded in a state connected to a runner connected to the sprue 6 via a side gate 5.

The conventional side gate type mold was replaced with the fifth one.
Shown in Figure A.

The side gate type mold die shown in FIG. The product 7 is molded by injecting molten resin into the cavity formed by the movable cavity b and the fixed cavity a.

The fixed plate 8 is fixed to a fixed receiving plate 10 having a central hole 12 communicating with the sprue 6, and the movable plate 9 is fixed to a movable receiving plate 11 having a runner lock pin 13 and through which an eject pin 15 passes.

During mold forming, the molten resin is transferred to the fixed receiving plate 10.
The runner 6A passes through the sprue 6 from the center hole 12 of the
Flows into the movable side cavity b from the side gate 5
and is injected into the cavity formed by the fixed side cavity part a, and the product 7 is molded.

To take out the product 7, when the movable plate 9 moves backward downward in the figure as shown in FIG.
4, the product 7 comes to the movable plate 9 side and moves away from the fixed plate 8.

Thereafter, the runner lock pin 13 and the eject pin 15 are operated and ejected, and the product 7 with the sprue runner section 16 is thrown off from the movable plate 9.

The sprue runner portion 16 can be easily separated from the product 7 by manually breaking the side gate portion.

The pin gate type mold type shown in Fig. 6A is as follows:
A fixed side plate 17 having a runner, a pin gate 22 and a fixed side cavity part a, a movable plate 18 having a movable side cavity part b, and a spacer 19 having a sprue 6, the fixed side cavity part a and the movable side cavity part The product 7 is molded by injecting molten resin into the cavity formed by b.

The fixed side plate 17 has a guide pin 23 and a stripper bolt 2 attached to the movable plate 18.
It is engaged with the movable plate 18 via 4.

The spacer 19 is fixed to a fixed receiving plate 20 having a central hole 12 communicating with the sprue 6, and the movable plate 18 is fixed to a movable receiving plate 21 through which the eject pin 15 passes.

During mold forming, the molten resin is transferred to the fixed receiving plate 20.
from the center hole 12 through the sprue 6 to the runner 6B.
Flows into the fixed side cavity part a from the pin gate 22
and the movable side cavity part b are injected into the cavity formed by
Product 7 is molded.

To take out the product 7, when the movable plate 9 moves backward in the downward direction as shown in FIG. .

At this time, the sprue runner portion 16' remains on the spacer 19 side together with the fixed plate 17.

When the movable plate 18 further retreats, the eject pin 15 is actuated and protrudes to push the product 7 off the movable plate 18.

When the movable plate 18 further retreats, the head of the stripper bolt 24 engages with the stepped surface of the stepped hole of the fixed plate 18, so the fixed plate 17 retreats together with the movable plate 18, causing the fixed plate to 17 is separated from the spacer 19, and the sprue runner section 16' is separated from the spacer 19.
remain on the side.

The sprue runner portion 16' remaining on the spacer 19 side can be easily removed from the spacer 19 by pulling it manually.

[Problem that the invention attempts to solve]

The quality of molded parts is greatly influenced by the gate method, gate position, etc. in addition to the molding conditions.

For example, the amount of pressure applied during molding changes depending on the shape and dimensions of the product, and the direction of shrinkage after molding may be completely different from what was expected, resulting in the product not having the desired dimensions. Therefore, it is often unclear whether a side gate or pin gate is better for the mold type.

Therefore, when prototyping a product, a mold is designed using the pin gate method, and when the prototype is produced, the dimensions are not available, so the mold is remade using the side gate method.

Changing the gate system in this way requires remaking the mold itself, which poses the problem of not only increasing the cost of the mold but also lengthening the delivery time.

The present invention was created in view of these points, and its purpose is to provide a dual-purpose mold type that is compatible with both side gate and pin gate systems.

[Means for solving problems]

In order to achieve the above object, the present invention has a movable cavity b formed in a movable plate 25 and a fixed cavity a formed in a fixed plate 26, as illustrated in FIG. A runner 27 formed on the stationary plate 26, which is a mold for molding a product by injecting molten resin into a cavity.
A side gate 28 provided at a selected end of the runner 27, a pin gate 29 provided at another selected end of the runner 27, a removable side gate plug A that plugs the side gate 28, and a removable side gate plug A that plugs the pin gate 29. The configuration includes a pin gate stopper B.

[Effect]

When the dual-purpose mold type shown in FIG. 1A is of a pin gate type, a side gate plug A shown in FIG. It is constructed as shown in FIG. 2A, which will be described later, and the molten resin is injected only into the pin gate 29 from the sprue 6.

The end surface of the side gate plug A on the side of the movable plate 25 is in close contact with the end surface of the plug D in FIG.

The mold operates in exactly the same manner as the pin gate method shown in FIG. 6, and the product is taken out in the same manner as described in FIG. 6B.

On the other hand, when using the side gate method, remove the spacer 9 and stripper bolt 24 from the dual-purpose mold shown in FIG. 1A, and insert the pin gate plug B shown in FIG. The side gate 28 is inserted from the sprue 6 and configured as shown in Fig. 3 A to be described later.
Inject the molten resin only into the

Note that the runner lock pin 30 is inserted into the runner lock pin hole e.

The mold operates in exactly the same manner as the side gate method shown in FIG. 5, and the product is taken out in the same manner as described in FIG. 5B.

In the present invention, as described above, the movable plate 25 and the fixed plate 26, which require precision, can be used in common, so it is easy to change between the side gate method and the pin gate method.

Therefore, the mold is inexpensive and the delivery time is short.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

The mold type shown in FIG. 1A includes a spacer 19 that is removably attached to a fixed receiving plate 20 having a sprue 6 that is an inlet for molten resin, a fixed side cavity a, a side gate 28 at a selected end of a runner 27, and A fixed side plate 26 in which a pin gate 29 is formed at the other selected end of the runner 27, and a movable plate closely fixed to the movable receiving plate 21, in which a movable side cavity b is formed opposite to the fixed side cavity a. 25.

The runner 27 has a central portion communicating with the sprue 6 and is composed of a substantially truncated conical runner portion c communicating with the side gate 28, and a substantially dish-shaped runner portion d communicating with the pin gate 29.

24 is planted on the parting surface of the movable plate 25, and is connected to the hole of the spacer 19 and the fixed side plate 2.
This is a stripper bolt that fits into the stepped hole No. 6.

Reference numeral 23 denotes a guide pin that is planted on the parting surface of the movable plate 25 and inserted into the guide hole of the spacer 19 and the guide hole of the fixed plate 26.

Further, a runner lock pin hole e into which a runner lock pin 30 is inserted is provided in the center of the movable plate 25. Furthermore, a hole through which the eject pin 15 passes is provided at a position corresponding to the bottom of the movable cavity b.

When using the pin gate 29, insert the side gate plug A shown in FIG. 1B into the runner part c, and insert the plug D shown in FIG. 1D into the runner lock pin hole e. , a mold as shown in Figure 2A.

Then, the product 7 is molded by injecting the molten resin from the sprue 6 through the runner part d and the pin gate 29 into the cavity formed by the fixed cavity part a and the movable cavity part b.

When taking out the product 7, the movable plate 25 is moved backward in the downward direction as shown in FIG. 2B.

As a result, the product 7 is fixed to the fixed side plate 26.
(The pin gate 29 portion is cut off) and retreats together with the movable plate 25.

At this time, the sprue runner portion 16' remains on the spacer 19 side together with the fixed side plate 26.

When the movable plate 25 further retreats, the eject pin 15 is actuated and protrudes to eject the product 7 from the movable plate 25.

Then, when the movable plate 25 further retreats, the head of the stripper bolt 24 engages with the stepped surface of the stepped hole of the fixed plate 26, so the fixed plate 26 retreats together with the movable plate 25, causing the fixed plate to 26 is separated from the spacer 19, and the sprue runner portion 16' is separated from the spacer 19.
remain on the side.

The sprue runner portion 16' remaining on the spacer 19 side can be easily removed from the spacer 19 by pulling it manually.

On the other hand, when using the side gate 28, the spacer 19 and stripper bolt 24 are removed from the mold shown in FIG.

Then, insert the pin gate plug B shown in FIG. 1B into the runner part d of the runner 27 that communicates with the pin gate 29, and insert the runner lock pin 30 into the runner lock pin hole e, as shown in FIG. 3A. It is made into a mold type.

Then, the molten resin from the sprue 6 is passed through the runner part c and the side gate 28 to the fixed side cavity part a.
The product 7 is molded by injecting the liquid into the cavity formed by the movable cavity part b and the movable cavity part b.

To take out the product 7, when the movable plate 25 moves backward in the downward direction as shown in FIG. 26
Move further away.

Thereafter, the runner lock pin 30 and the eject pin 15 are ejected, and the product 7 with the sprue runner section 16 is separated from the movable plate 25.

The sprue runner portion 16 can be easily separated from the product 7 by manually breaking the side gate portion.

Since the present invention has a dual-purpose mold type as described above, it is possible to easily change from a side gate type to a pin gate type, or from a pin gate type to a side gate type when molding a product for trial production.

[Effect of idea]

As explained above, the present invention can be applied to the side gate method and the pin gate method, and the movable plate and fixed side plate, which require high precision, can be used in common, so the mold type can be used at low cost. have an effect.

Furthermore, since the fixed plate and the movable plate are common, the mold can be produced in a short delivery time.

[Brief explanation of the drawing]

Figure 1 A to D are diagrams explaining one embodiment of the present invention, Figure 2 A and B are diagrams of the application of the present invention to a pin gate, and Figure 3 A and B are diagrams of the application of the present invention to a side gate. Figures 4A to 4D are diagrams explaining the molded parts, Figures 5A and 5B are diagrams explaining the side gate type mold mold, and Figures 6A and 6B are the conventional pin gate type molds. It is a figure explaining the mold type. In the figure, A is the side gate plug, B is the pin gate plug, D is the plug, a is the fixed side cavity, b is the movable side cavity, c and d are the runners, e is the hole for the runner lock pin, 2, 29 is pin gate, 3, 6 is sprue, 5, 28 is side gate, 6A, 6B,
27 is a runner, 7 is a product, 8 is a fixed plate,
9, 18, 25 are movable plates, 10, 20 are fixed receiving plates, 11, 21 are movable receiving plates, 13, 30 are runner lock pins, 15 are eject pins, 1
6, 16' are sprue runner parts, 17, 26
19 indicates a fixed side plate, 19 a spacer, 23 a guide pin, and 24 a stripper bolt.

Claims (1)

[Claims for Utility Model Registration] Movable side cavity b formed in the movable plate 25
A mold for molding a product by injecting molten resin into a cavity constituted by a fixed-side cavity part a formed in the fixed-side plate 26, and a runner 2 formed in the fixed-side plate 26.
a side gate 28 provided at a selected end of the runner 27; a pin gate 29 provided at the other selected end of the runner 27; a detachable side gate plug A for plugging the side gate 28; and a removable side gate plug A for plugging the pin gate 29. A molded type that can be used as both a pin gate and a side gate.