JPH078173Y2 - Silicon resin mating mold for synthetic resin molding - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is applicable to epoxy resin
The present invention relates to a structure of a silicone resin mating mold used for molding synthetic resin such as stell resin and vinyl chloride resin .

[0002]

2. Description of the Related Art As is well known, since silicone resin has weak adhesiveness, it is easy to take out a molded product, and since it has excellent heat resistance, it has a merit that thermal deformation due to temperature rise is small. Widely used as a mold material for molding synthetic resin.

By the way, a conventional synthetic resin-molding mold made of silicone resin is, as schematically shown in FIG. 7 to FIG. The mating mold members 1 and 2 are provided with pattern forming surfaces 5 and 6 in which a pattern space 4 of a synthetic resin molded product (for example, a cylindrical body) 3 is formed by closing the mold members 1 and 2. In addition, the mold member 1 generally has a structure in which a molten synthetic resin injection hole 7 and an air vent hole 8 which communicate with the pattern space 4 are provided.
There was

[0004]

However, in this conventional mating die, not only defects due to air bubbles are formed in the synthetic resin molded product 3 by vacuum molding, but also when the molded product 3 is taken out from the mold, a mold member is used. A spatula or the like is inserted into the mating surfaces 9 of 1 and 2 to split the mold members 1 and 2, but in this case, the spatula or the like is inserted too far into the surface portion 10 of the molded product 3 due to the spatula or the like. It had problems such as being scratched.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to prevent the synthetic resin molded product from containing air bubbles and to use a spatula when the mold is divided. An object of the present invention is to provide a silicone resin-made mold for molding synthetic resin, which is capable of obtaining a good molded product without surface scratches due to the above.

[0006]

To this end, the present invention is directed to a pair of silicone resins which can be closed and opened.
The pair of silicone resin-made mold members each have a pattern forming surface on which a pattern space portion of a synthetic resin molded product is formed by closing, and Integral communication, and a pair of seals
Molten synthetic resin injection holes each having a forming surface in which one inner side of the mating surface of the recon resin mating member is formed as a twill line and a projecting space portion as a non-pattern space portion is formed, and further communicating with the pattern space portion. And an air vent hole communicating with the projecting space.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings and its operation. FIG. 1 is a schematic plan view of an example of a mating die according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 3, FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1, FIG. 4 is an end view seen from the direction C of FIG. 1, and FIG. 5 is a cross-sectional view seen from the direction D of FIG. The pair of mating mold members 20 and 21 that can be closed and split freely are integrally molded of a silicone resin material having elasticity, and the mold members 20 and 21 are integrally molded.
Are respectively formed on the pattern forming surfaces 24 and 25 on which the pattern space portion 23 for obtaining the synthetic resin molded product 22 is formed.
In addition to having the above, it communicates with the pattern space portion 23 integrally,
In addition, the inner side 26 of the mating surfaces due to the closure is used as a traverse
The molten synthetic resin 3 has forming surfaces 28 and 29 in each of which a protruding space portion 27 serving as a non-pattern space portion is formed in the longitudinal direction of the inner side 26, and further communicates with the pattern space portion 23.
An injection hole 31 of 0 and an air vent hole 32 communicating with the projecting space 27 are provided on the opposite side of the injection hole 31.

Although the pair of mold members 20 and 21 has a completely divided structure, the invention is not limited to this.
21 can also be a divided structure integrally provided continuously at its common base, and in any structure, in order to perform alignment positioning at the time of mold matching, at appropriate positions on the relative surface parts of the pair of mold members. It is also possible to provide, for example, a concave portion on either one of them and a convex portion that fits into the concave portion on the other.

Although not particularly shown, the pair of mold members 20 and 21 are provided in a separable aluminum housing in a longitudinal direction on one side of the synthetic resin molded product 22.
7 (a part corresponding to 7) is integrally supported by a wooden mold (mother mold) at the joint portions of the casings at its both end supporting portions and placed in a suspended state.
Next, after the case is clamped with the upper and lower mold clamping plates and the bolts and nuts at the four corners, molten silicon resin is injected from the injection hole of the case to solidify it, then the mold is released and the case is removed. The silicon resin body is taken out, and then the silicon resin body is horizontally divided from both ends of the supporting portion of the wooden mold (mother mold) to the wooden mold (mother mold) to obtain a pair of silicon resin mold members 20, 21. is there.

After the pair of mold members 20 and 21 are clamped together, the molten synthetic resin 30 is injected from the injection hole 31 into the pattern space portion 23 and the projecting space portion 27 to be cured, and at the same time, the pattern space is formed. Since the bubbles in the molten synthetic resin in the portion gather in the protrusions 33 formed by injection in the protrusions space 27, the bubbles are evacuated from the air vent 32 to release the mold, and then the mold is released. A spatula or the like is put on one outer side 34 of the mating surfaces of the members 20 and 21 to form the mold members 20 and 21.
The synthetic resin molded product 22 is taken out by splitting, and unnecessary protrusions 33 and the like are cut off by post-processing to obtain a product. In the case of inserting the spatula or the like into the mold members 20 and 21, the spatula or the like may be excessively inserted to the back in the past and the surface of the synthetic resin molded product may be erroneously scratched by the spatula. In this model, even if a spatula is inserted too far into the mold, the spatula will only hit the protruding portion 33 of the synthetic resin molded product that will be cut off later. without also can make split mold members 20 and 21 easily and quickly
Of.

[0011]

According to the present invention, however, a pair of silicon resin mold members 20 and 21 which can be closed and split freely.
Are provided with pattern forming surfaces 24 and 25 that form the pattern space portion 23 of the synthetic resin molded product, and formation surfaces 28 and 29 that form the protruding space portion 27 that communicates integrally with the pattern space portion 23. Since the air vent hole 32 communicating with the portion 27 is provided, the air bubbles in the molten synthetic resin injected into the mold member gradually gather in the protruding portion 33 as the resin hardens and are evacuated from the air vent hole 32. Therefore, the synthetic resin molded product 22 does not contain air bubbles, and the mold members 20 and 21 are inserted by inserting a spatula or the like.
Even if a spatula or the like is inadvertently inserted all the way to the back when dividing, the surface of the synthetic resin molded product will not be damaged, and it will only hit the unnecessary protruding portion 33 that will be cut off by post-processing. Good synthetic resin without scratches can be easily obtained.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an example of a mating die according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is an end view seen from the direction C in FIG.

5 is an end view as seen from the direction D in FIG. 1. FIG.

FIG. 6 is a cross-sectional view showing an injection state of molten synthetic resin.

FIG. 7 is a schematic plan view showing a conventional example.

FIG. 8 is an end view as seen from the F direction in FIG.

9 is a cross-sectional view taken along the line EE of FIG.

FIG. 10 is a cross-sectional view showing an injection state of molten synthetic resin.

[Explanation of symbols]

20, 21 A pair of silicon resin mold members 22 Synthetic resin molded product 23 Pattern space portion 24, 25 Pattern forming surface 26 One side of mold member mating surface 27 Projecting space portion 28, 29 Forming surface 31 Melt synthetic resin injection hole 32 Air vent hole 34 One outside of mating surface

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Claims (1)

[Scope of utility model registration request] 1. A pair of silicon which is freely closure Hirakiwari each other
A pair of silicone made of plastic
The resin-made mold members each have a pattern forming surface on which a pattern space portion of a synthetic resin molded product is formed by closing, and are integrally communicated with the pattern space portion, and are made of a pair of silicone resin members . Within one of the mating surfaces of the mating members
Side as ridge has a forming surface on which protruding space as a non-pattern space are respectively formed, further the molten synthetic resin injection hole communicating with the pattern space, air vent in communication with the protruding space Characterized by a structure with holes
Silicon resin mating mold for synthetic resin molding.