JPH01237111A - Injection molding die - Google Patents

Abstract

PURPOSE:To make a molded product large, reduce a dead space to a large extent and better workability by providing a slide mechanism of a side core on the mold fixed frame side. CONSTITUTION:A cavity 35 to which a side core shape section 4 forming an undercut section of a molded product is formed on the edge of a core mold 3, communicating with a molded product cavity section formed at the time of setting the cavity mold, and also an undercut is formed by projecting a slide core at said cavity section when the shape section 4 proceeds. A fitting section 41 is constituted at the rear end of shape section 4, and an engaged channel 43 provided on a slide mechanism section 42 is inserted from the side with some clearance, and the slide core shape section 4 is mounted on the mechanism section 42 to be fitted therein. An angular pin 45 provided on a cavity side mold fixed frame 11 is inserted and fitted into an angular hole 44 and moved forward and backward with the movement of the fixed frames 1 and 11 guided by the hole 44 in accordance with the implanted angle of the pin 45.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention relates to a synthetic resin for undercut molding in which a core separate from the mold body is molded by protruding from the lower edge of the molded product body. This invention relates to injection molds.

(b) Conventional technology Conventionally, an external molding machine body is equipped with a molded product shape part, which is a mold body, an opening/closing mechanism for opening and closing the mold body, and an injection injection mechanism for injecting materials such as synthetic resin. The frame mechanism has traditionally been formed integrally with the frame mechanism, but recently it has become too uneconomical to make molds with all the outer frame mechanisms for each type of molded product, so the outer frame mechanism part, which is a common part, has become too uneconomical. The mold fixing frame is used to removably fix the same-shaped part separately from the molded part, and the molded part is now configured so that only the molded part can be replaced.

However, undercut molding must be performed by protruding the undercut molding core into the recess of the core mold separately from the core mold that is the main body of the molded product. When the mold opens, the undercut molding core protruding into the molded product recess moves back, allowing the molded product to be taken out.A slide mechanism has been provided at the outer edge of the molded product shape.

(c) Problems to be Solved by the Invention The slide mechanism of the slide core for molding the undercap part requires considerable structural elements such as an angular pin, a corresponding angular pin hole, and a slider block for sliding the core. This mechanism occupies a considerable amount of space in the mold body. Therefore, the space that can be used for the actual shape of the molded product in the mold body is 2
It remains at 2-29%. Moreover, this mechanical space is not only for one of the core and cavity, but also for the pair of mating types.

Another problem is that the mold body becomes larger and heavier, making replacement work extremely difficult.

(d) Means for Solving the Problems In order to solve the above problems, the present invention provides a structure in which the slide mechanism of the slide core, which was conventionally provided on the mold body side, is provided on the mold fixing frame side. The problem was solved by doing this.

(E) Function In the injection mold configured as above, the main body part that constitutes the molded product shape part is dedicated to the molded product shape, and the complicated mechanism related to operation is installed on the mold fixing frame side. It is also advantageous in terms of work design. Moreover, since the effective space of the shaped part becomes larger, the molded product itself can be made larger, such as molded products that were conventionally molded in two steps, but can be molded all at once.

(f) Implementation example The present invention will be described in detail below with reference to the drawings.

1 is a core side mold fixing frame having a guide hole 2 at its main edge and a core mold 3 having a convex shaped part in the center;
are tightened and fixed by a tightening member.

A cavity portion 35 is formed at the edge of the core mold 3, into which the slide core shape portion 4 that forms the undercut portion of the molded product fits, and the molded product cavity portion formed when the molded product is fitted with the cavity mold. Along with the communication slide, when the shaped part 4 moves forward, a slide core protrudes into the same cavity part to form an undercut.

The rear end of the shaped part 4 constitutes a fitting part 41, which is inserted from the side with a slight clearance and fitted into the fitting groove 43 provided in the slide mechanism part 42, and is fitted into the sliding core shaped part 4.
is attached to the mechanism section 42.

Note that it goes without saying that the shaped portion 4 may be attached to the mechanism portion 42 by other methods.

Alternatively, the shape portion 4 and the mechanism portion 4 may be formed integrally, and this block body may be converted to change the shape of the slide core.

The slide mechanism section 42 includes an angular hole 44 and is slidably mounted on the fixed frame 1, and an angular pin 45 provided on the mold fixing frame 11 on the cavity side is inserted and fitted into the angular hole 44. Depending on the angle at which the pin 45 is installed, the fixed frames 1 and 11 guided by the hole 44 move forward and backward in response to coming into contact with each other and separating from each other. A guide ball 21 that is inserted and fitted into the guide hole 2 is implanted in the mold fixing frame 11 on the cavity side, and a cavity mold 31 that forms a concave molded part is fitted in the center and is tightened by a tightening member. It is attached and fixed.

5 is the injection nozzle touch, and the material injected from the nozzle is transferred to the injection hole 1 of the fixed frame 11.
2. It is filled into the molded product shape cavity 33 through the injection hole 32 of the mold 31, and after molding, the molded product is taken out by a protruding pin protruded from the protruding pin hole 34.

(G) Effects of the Invention Since the present invention is configured as described above, approximately 41% of the space of the mold body can be utilized for molding the shape of the molded product.
This not only makes it possible to make larger molded products, but also greatly reduces the conventional dead space. Also, mold conversion,
It is also advantageous in that it has good workability in terms of positioning and fixing to the fixed frame.

[Brief explanation of the drawing]

The figures show embodiments of the present invention; FIG. 1 is a side view of the injection mold according to the present invention in a separated state with main parts seen through; FIG. 2 is a longitudinal sectional side view of the injection mold in a fitted state; FIG. 2a is an enlarged view of portion A in FIG. 2, and FIG. 3 is a partially enlarged perspective view showing a state in which the slide core shaped portion is fitted to the slide mechanism portion. 1 ~ Core side mold fixing frame 11 ~ Cavity side mold fixing frame 12 ~ Injection hole 13 ~ Projection pin 2 ~ Guide hole 21 ~ Guide pole 3 ~ Core mold 31
~ Cavity mold 32 ~ Injection hole 33 ~ Molded product shape cavity 34 ~ Protruding pin hole 35 ~ Cavity 4 of undercut portion ~ Slide core shape portion 41 ~ Fitting portion 42 ~ Slide mechanism portion 43 ~ Fitting groove 44 ~ Angular hole 45 ~ Angular pin 46 ~
Guide pin 5 ~ Nozzle touch 51 ~ Spring 1 Figure A7-

Claims (1)

[Claims] In an injection mold in which the mold forming the molded product shape part and the mold fixing frame that fixes the mold and attaches it to the molding machine body are separately configured, the molded product shape part is formed as the mold is opened and closed. An injection mold characterized in that a sliding mechanism part of a sliding core that appears and retracts is provided on the mold fixing frame side.