JPH04249115A - Resin molding die device - Google Patents

Abstract

PURPOSE:To rationalize a space and form the space for storing an ejector pin and a temperature control circuit in a resin molding die for forming an undercut by adopting a link mechanism for the mechanism of drawing and inserting a slide block. CONSTITUTION:The drive of a cylinder 4 is transmitted to a slide block 2 by means of a link mechanism consisting of a slide core and a link 6 and drawing and inserting of an undercut section of a resin molded product 1 is carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die device for cutting out an undercut portion of a resin molded product.

0002

2. Description of the Related Art In FIG. 4, reference numeral 1 denotes a resin molded product having a cylindrical shape with an undercut on the core side.

FIG. 2 shows a mold apparatus for the resin molded product 1 of FIG. 4, in which 12 is a slide block having an undercut shape at the upper end, and a slide block 12 having an undercut shape at the lower end, which slides on an inclined guide of a slide core 13 as shown in FIG. It has a flange portion 12a. The slide core 13 is driven by a cylinder 14 in the direction of the arrow and has an inclined guide that supports the collar 12a of the slide block 12. 15 is part of the core and slide block 1
2 is guided and supported in its sliding direction. Note that 16 is an upper mold of this mold apparatus, and 17 and 18 are lower molds.

The operation of the mold apparatus constructed as described above will be explained below. First, when the mold is opened, the slide core 13 is pulled to the right by the cylinder 14. At this time, the collar portion 12a of the slide block 12, which is held between the inclined guides provided on the slide core 13, slides on the inclined guides. By this operation, the slide block 12 is guided and supported by the part 15 of the core and falls off in that direction, thereby removing the undercut shape and releasing the mold.

[0005]

[Problems to be Solved by the Invention] However, in the above structure, the shape of the inclined guide portion of the slide core 13 for extracting the slide core 13 becomes large, the undercut-shaped lower core is eliminated, and the protruding pin or The space for the temperature control circuit is limited, which leads to whitening and whitening when the molded product is released.
This has the problem of causing molding defects such as cracks and warping, and reducing mass productivity.

In view of the above-mentioned problems, the present invention is capable of molding a molded product having a cylindrical shape with an undercut without using a structure in which the slide core has an inclined guide as in the conventional example, and also prevents whitening and The purpose of the present invention is to provide a mold device that is less prone to cracking and warping and can improve mass productivity.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the resin molding mold device of the present invention includes a slide block having a shaped portion for forming an undercut portion of a molded product, and a slide block having a shape portion for forming an undercut portion of a molded product. A biasing means having a link structure that biases in a direction of insertion and removal from the undercut portion;
The guide and support means guide and support the slide block when the slide block is inserted and removed.

[0008]

[Function] With the above-described structure, the present invention can provide a space in which a projecting pin can be provided in the core at the bottom of the undercut shape or a temperature control circuit can be installed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A resin molding mold apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a resin molded product having a cylindrical shape with an undercut on the core side, and 2 is a slide block with an undercut shape on the upper end, and has a pin 2b on the lower end for connecting a link. 6 is a link having one end connected to the connecting pin 2b of the slide block 2 and the other end connected to the slide core 3. The slide core 3 is driven by a cylinder 4 and reciprocates in a direction perpendicular to the opening/closing direction of the mold. 5 is a part of the core that guides and supports the slide block 2 in the sliding direction of insertion and removal. 7 is a protruding pin hole, and 8 is a temperature control hole through which hot water or oil flows to keep the mold at an appropriate temperature. Note that 9 is an upper mold of the mold apparatus of the present invention, and 10 and 11 are lower molds.

The operation of the resin molding mold apparatus constructed as described above will be explained. FIG. 1 shows the molding die device before the mold is opened, and when the mold is opened, it is pushed to the left by the slide core 3 or the cylinder 4.

At this time, the link 6 is pushed through the pin provided on the slide core 3, and the other end of the link 6 is connected to the pin 2b at the lower end of the slide block 2, so the slide block 2 is guided by the core 5. The undercut shape is removed by sliding in the direction indicated. When closing the mold, the slide core 3 moves to the right to move the slide block 2 to the position shown in Figure 1.
Restore it to the position shown in the figure.

[0013]

[Effects of the Invention] As is clear from the above explanation, the present invention has the following advantages:
By adopting a link structure, it protrudes into the mold at the bottom of the undercut shape, making it possible to secure space for installing a temperature control circuit, which reduces molding defects such as whitening, cracking, and warping of molded products during mold release, and improves mass productivity. I can figure it out.

[Brief explanation of the drawing]

[Fig. 1] A cross-sectional view of a resin molding mold device according to an embodiment of the present invention.

[Figure 2] Cross-sectional view of a conventional resin molding device for undercut molding

[Figure 3] A cross-sectional view of a part of the same resin molding mold device

[Figure 4] A perspective view of an example of a resin molded product with an undercut part.

[Explanation of symbols]

1 Resin molded product with undercut portion 2 Slide block 3 Slide core (biasing means) 4 Cylinder (biasing means) 5 Core (guiding support means) 6 Link (biasing means)

Claims (1)

[Claims] 1. A slide block having a shaped portion for forming an undercut portion of a resin molded product, a link structure urging means for urging the slide block in a direction to insert or remove the slide block from the undercut portion, and the aforementioned slide block. A resin molding mold device comprising a guide support means for guiding and supporting a slide block to be inserted and removed.