JPS60221300A - Mold for molding insert - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold that can partially punch out an insert in a cavity formed by a male die and a female die.

Plate materials made of thin metal sheets, wire mesh, or synthetic resin
- & stammer, when coating the inner and outer surfaces of synthetic resin products,
Insert molding is generally used. In addition, the synthetic resin product may have an in-plane opening, such as a frame, or
If the lining is in the form of a lattice, openings and multiple holes are provided during preforming of the insert used as the lining, and after it is inserted into the mold, Measures are taken to prevent the material resin forming the body of the synthetic resin product from flowing into the openings, holes, etc. This inflow prevention means is achieved by using a core member that protrudes into the cavity. It was necessary to match the positions of the two, and even slight differences in the positions and dimensions of the two were not allowed, and even greater precision was required in the preforming of the insert.

The present invention was devised to solve the above-mentioned problems in conventional insert molding, and its purpose is to use it as a coating for synthetic resin products that have in-plane openings, holes, etc. As long as the insert has a thickness that allows punching, it can be punched into the desired shape in a mold, thereby eliminating the need to punch out openings, etc. during preforming of the insert. Another object of the present invention is to provide an insert molding die that has a high precision in the punching part and can mold a main body of synthetic resin flush with the periphery formed by punching.

The feature of the present invention for the above-mentioned purpose is to provide a mold that includes a male mold and a female mold that fit into each other and that can be inserted along the surface of either one of the molds. A punching member for partially punching is provided, and a receiving hole is opened in the opposing mold surface of the punching member.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

In the figure, 1 is a male mold, 2 is a female mold, 3 is a cavity formed by both molds, and 4 is an insert for lining made of a thin metal plate or the like.

A perforation member 5 having a length that reaches within the mold surface of the male mold 1 in the mold closed state is protruded from the mold surface of the female mold 2. This perforation member 5 is made of hardened steel or the like, which is harder than the mold material.
Moreover, the tip has a sharp cutting edge 5a for punching.

A receiving hole 6 that fits into the tip of the perforating member 5 is provided on the mold surface of the male mold 1 that the blade 5a of the perforating member 5 faces, and the opening edge of the receiving hole 6 and the blade 5a are connected to each other. With this sliding movement, the insert on the mold surface of the male mold 1 can be partially punched out. Further, the punched piece 4a can be ejected by an extrusion pin 7 in a male die provided at the bottom of the receiving hole 6.

In the insert mold having the above structure, the insert 4, which has been preformed in almost the same shape as the mold surface of the male mold 1, is placed over the mold surface of the male mold, and the After holding it on the mold surface by means such as suction with a vacuum pump, fixation with a 27 member, adhesion or attraction with a permanent magnet, the male mold J is moved and both molds are closed, and a cavity 3 is formed. The cutting die 5a of the punching member 5 comes into contact with the insert 4 and punches out a part of the insert 4 by the die closing force.The male die 1 is often influenced by this punching operation. The mold is moved to completely close the female mold 2, forming a cavity 3 therein, and
The tip of the punching member 5 is accommodated in the receiving hole 6 together with the punched piece 5a. The punched part of the cut insert 4 is closed by the perforation member 5 located across the cavity 3.

Therefore, from the injection path 8 provided in the female mold 2 to the cavity 3
When the cavity is filled with molten resin and molded, the entire cavity is filled with the resin 9 except for the portion where the perforation member 5 is located. Then, when the male mold 1 is moved back and the mold is opened, the punching member 5
A through hole 11 is formed in the molded product 10 which is removed and released from the mold.

The embodiment shown in FIG. 4 and subsequent figures shows a case where the punching member 5 can be operated separately from the opening and closing operations of the mold.

The perforating member 5 in this embodiment is an ejector pin 12 which is moved in the axial direction by hydraulic pressure or spring pressure r in the male mold 1.
It is attached to the tip of the Further, inside the hole 6 in the female mold 2 that receives the punching member 5, a receiving member 13 that abuts against the blade mold 5a of the punching member 5 is placed at the tip of the ejector bin 14 in the same way as the punching member 5. Install it and insert it so that it can move forward and backward,
This receiving member 13 is placed to close the receiving hole 6.

2. The punching operation by the punching member 5 is performed only when the mold is closed, as in the first embodiment, because the punching member 5 together with the receiving member 13 can be operated separately from the opening and closing operation of the mold. The process is not limited, and can be performed after the mold is closed or after the cavity 3 is filled with the resin 9 and molded.

At the time when the cavity 3 is formed, only the insert 4 is punched out, as in the case of the first embodiment, but after the molding, the resin 9 existing inside the cavity is punched out.
and the insert 4. This punching is affected by the properties of the resin used; in the case of flexible resins, punching is possible even after it has solidified, but it is usually done before it has completely solidified. is friendly.

In the above embodiments, the insert 4 is placed on the mold surface of the male mold 1, but the insert 4 can also be inserted on the mold surface of the female mold 2 depending on the molded product.

In addition, the perforation member 5 can also be provided on the female die side, and the cross-sectional area of the perforation member can be changed in any way according to the design.
The present invention is not particularly limited to the examples.

As described above, the present invention provides the male mold 1 or the female mold 2 with the perforation member 5 that can partially punch out the insert 4, and also provides the receiving hole 6 on the opposing mold surface of the perforation member 5. Therefore, when insert molding a synthetic resin product having in-plane holes, there is no need to drill holes at the time of preforming the insert. If a hole is still punched in the insert, it is necessary to close the hole during molding, but in the present invention, the punched hole before molding is closed by the punching member, and the punched hole after molding is closed during molding. Since there are no punched holes, there is no need to block them, and not only does it eliminate the need for a closing member to prevent resin from flowing in, but also improves the accuracy of hole forming, making it possible to cut only partial holes regardless of the size of the hole. Depending on the perforated member, it is possible to mold not only insert molded products but also frame members, lattice-like members, etc.

Furthermore, since it is only necessary to provide a pair of male and female molds with a perforating member and a receiving hole therefor, the mold structure does not become particularly complicated, and insert molding can be performed using a conventional mold clamping device. It has many features that make it possible to

[Brief explanation of the drawing]

The drawings schematically show an embodiment of the insert molding die according to the present invention, and FIG. 1 is a longitudinal side view of the first embodiment when the mold is opened, and FIG. 2 is a longitudinal side view of the first embodiment when the mold is closed. , FIG. 3 is a perspective view of the molded product, FIG. 4 is a longitudinal side view of the second embodiment when the mold is opened, and FIG. 5 is a longitudinal side view of the second embodiment when the mold is closed. 1...Male die 2...Female die 3...Cavity 4...Insert object 5...Punching member 5a...Blade die 6・・・
...Reception hole patent applicant Showa Denko K.K.

Claims (1)

[Claims] A mold comprising a male mold and a female mold that fit into each other and which can be inserted along the mold surface of either one of the molds, wherein the male mold or the female mold is provided with a punching member for partially punching the insert, and A mold for insert molding, characterized in that a receiving hole is formed on the opposing mold surface of the perforation member.