JPH08281709A - Injection mold - Google Patents

Abstract

PURPOSE: To provide an injection mold in which a molding having excellent external appearance is obtained without generating the line of a mold mark without removal of the slide even if the external side of the molding is molded by a slide core. CONSTITUTION: An injection mold comprises a core 2 provided to protrude, and a cavity formed of the side 21 of the core 2 and the side 31 of a slide core 3 to mold the one side surface 11 of a molding, wherein an undercut part 21 is provided at the side 21 of the core 2 side to prevent the removal of the slide of the core 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die having a slide core removal preventing structure.

[0002]

2. Description of the Related Art Conventionally, as an injection molding die for molding the exterior side surface of a molded product, a structure generally formed by a cavity formed by a slide core and a side surface of the core provided on the back side of the slide core. Has been adopted.

In the injection molding die having the above-mentioned conventional structure, the phenomenon that the slide core is taken off tends to occur. As means for solving this problem, a method of changing the parting line between the core side and the slide core and hooking the molded product on the core side, or a method of protruding a part of the block from the slide core using a pressing force such as a spring, etc. Has been taken.

[0004]

However, when a molded product is molded using an injection molding mold in which the above slide core is taken out as a countermeasure, a line due to a mold mark remains on the outer side surface, The problem remains that the appearance quality is impaired.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to solve these problems and form the outer side surface of a molded product by a slide core. Even in this case, the present invention provides an injection molding die that does not cause the slide to be taken off, does not generate a line of mold marks and the like and can obtain a molded product having excellent appearance quality.

[0006]

In the injection mold of the present invention, one side surface of a molded product is molded by a cavity formed by a core and a side surface of the core and a side surface of the slide core. In the injection molding die, an undercut portion is provided on a side surface of the core in order to prevent the slide core from being slid off.

[0007]

In the injection mold of the present invention, the slide of the injection mold designed to mold one side surface of the molded product by the cavity formed by the core and the side surface of the core and the side surface of the slide core. Since an undercut portion is provided on the side surface of the core in order to prevent the core from being slid off, a molded product with excellent appearance quality can be obtained without being slid off and without causing lines such as mold marks.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a main part showing an example of an injection mold of the present invention, and FIG. 2 is a front view of FIG. Figure 1,
2 and FIG. 2, the core 2 provided so as to protrude to mold the side surface 11 of the box-shaped molded product 1 and the core 2
A cavity is provided by the side surface 21 of the and the side surface 31 of the slide core 3.

An undercut portion 22 is provided on a side surface 21 of the core 2 on the cavity side, as shown in the AA cross section of FIG. 2 and FIG. The undercut portion 22 is provided in the mold opening direction, and the height h, width w, and depth d of the undercut portion 22 are
It may be appropriately set depending on the shape of the molded product 1, the characteristics of the resin used, the molding conditions, and the like.

Further, the inclination angle θ of the undercut portion 22
Can be appropriately determined within a range in which the slide is not removed, and the height h of the undercut portion 22 is set so that the resistance against the slide removal can be sufficiently exerted.
It is decided in relation to.

As described above, by providing the undercut portion 22 for preventing the core 2 from being slid off, it is not necessary to provide a means for obstructing the appearance on the appearance side of the molded product 1, and , The recess 12 is formed inside the side surface 11 of the molded product 1 due to the undercut portion 22 provided on the side surface 21 of the core 2, but since it is on the back side of the product, it has no effect on the quality. Never.

[0012]

INDUSTRIAL APPLICABILITY In the injection molding die of the present invention, an injection molding die configured to mold one side surface of a molded product by a cavity formed by the core and the side surface of the core and the side surface of the slide core. In order to prevent the slide core from being taken off, an undercut part is provided on the side of the core, so it does not come off and there are no traces of mold marks, etc. To be Therefore, it is preferably used as an injection mold for a molded product whose side surface is molded with a slide core.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an example of an injection molding die of the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Molded Product 11, 21, 31 Side 12 Depression 2 Core 22 Undercut Part 3 Slide Core θ Inclination Angle d Depth h Height w Width

Claims (1)

[Claims] 1. An injection molding die for molding one side surface of a molded product by a cavity formed by the core and the side surface of the core and the side surface of the slide core,
An injection molding die characterized in that an undercut portion is provided on the side surface of the core to prevent the slide core from being slid off.