JPS635910A - Mold for insert molding - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a molded item having an insert member, on the back surface side of the non-covered portion of which an air gap part or part with no resin entered therein is equipped, by a method wherein nearly tongue-shaped projections, each of which covers the non-covered portion of the insert member, are provided on the cavity-forming side walls of at least one mold of two molds. CONSTITUTION:Tongue-shaped projections 25 are provided on the cavity-forming side wall so at least one mold of two molds or of the fixed mold 23 and the movable mold 24, both of which compose molds for insert molding. A portion, which forms a non-covered portion 16, of an insert member 12 is covered by the projection 25. When insert molding is done under the state that the non- covered portions 16 are covered by the projections 25, the molded item obtained by insert molding has air gap parts at the back surfaces of the non-covered portions 16, because no resin can enter in the portions, in which the projection 25 exist.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to the structure of an insert molding die.

(Conventional technology) Insert molding methods have been well known.

In this molding method, an insert member made of metal or synthetic resin is set in the cavity of an insert mold, and then a molding resin or a molding material that reacts to become a resin is injected into the cavity. It is a way to obtain goods.

(Problems to be Solved by the Invention) This method is an excellent method for obtaining a synthetic resin molded product to which an insert member is integrally fixed. When attempting to obtain a molded product by the insert molding method in which a part of the insert member 52 is exposed inside the synthetic resin molded product 51 and a void 53 in which the resin does not enter is present on the back side of the exposed part, In order to perform molding so that resin does not enter the back side of the exposed portion of the insert member 52, the mold must be provided with a slide core 55, etc., resulting in a problem that the mold structure becomes complicated.

In addition, since a hole 54 for moving the slider 55 forward or backward is formed in the synthetic resin molded product 51, it is difficult to manufacture a molded product in which the hole 54 becomes the design surface of the synthetic resin molded product. The prior art described above could not be applied. An object of the present invention is to provide an insert molding die with a simple structure that can solve the above problems.

Structure of the Invention (Means for Solving Problems) In order to achieve the above-mentioned object, the present invention provides an insert molding mold consisting of a fixed mold and a movable mold, in which at least one of the two molds is A technical measure is adopted in which a substantially tongue-shaped protrusion is provided on the cavity forming side wall of the mold to cover the uncovered portion of the insert member.

(Function) A tongue-shaped protrusion is provided on the cavity forming side wall of at least one of the fixed mold and the movable mold constituting the insert molding mold. This protrusion covers a portion of the insert member that is not covered.

If in-one note molding is performed with the non-covered part covered with the protrusions, the resin cannot penetrate into the part where the protrusions are present, so the molded product obtained by insert molding will be molded on the back side of the non-covered part. There will be voids.

(Example) Next, an embodiment embodying the present invention will be described.

[Insert molding mold] As shown in FIGS. 1 to 4, the insert molding mold 22 of this embodiment includes a lower mold 23 having a recess 23a, and a lower mold 2.
An upper mold 24 is stacked on top of the mold 3 to form a cavity C, and the former is a fixed mold, while the latter is a movable mold.

A tongue-shaped projection 25 is provided at the lower part of the cavity forming side wall 24X that forms a part of the cavity C in the upper die 24.
is formed.

The front surface 25a of the protrusion 25 is vertical, or when the upper mold 24 and the lower mold 23 are relatively separated,
The protrusion 25 is inclined to such an extent that the protrusion 25 does not catch the molded product formed in the cavity C.

As shown by the two-dot chain line in FIG. 4, a gap 25b is formed in the lower part of the protrusion 25, into which a recess of an insert member to be described later can be inserted from below.

Incidentally, the upper die 24 may be supplementarily provided with temporary fixing means for temporarily fixing the insert member, such as a permanent magnet, a temporary fixing pin, or a slide core.

[Insert Member] As shown in FIG. 5, the insert member 12 set in the upper mold 24 includes a main body 13 made of a metal plate;
It consists of a temporary fixing part 14 of a metal plate extending outward from one side of the plate.

The main body part 13 is composed of an uncoated part 16 which is press-molded into a semicircular shape and has a concave part 16a on the back side, and a flat handle part 29 in which a through hole 17 is provided.

In the insert molded product, the uncoated portion 16 is exposed to the outside without being buried in the resin, and a locking member described later is fitted into a locking hole 15 in the center.

The recess 16a has a U-shaped planar shape and is formed so that the protrusion 25 can be slid into it from one direction, so that the front surface 25a of the protrusion 25 and the back surface 29a of the rear stopper member 29 are flush with each other. The recess 16a is the projection 2
Covered by 5.

The insert member 12 slides its non-coated portion 16 into the gap 25b of the protrusion 25 to secure the temporary fixing portion 1.
4 and temporarily fixed to the cavity forming side wall 24x.

The functions and effects of this embodiment configured as described above will be described below.

[Insert molding process] Figures 2 and 3 [Insert molding mold 2 as shown]
First, a skin 10 is formed from polyvinyl chloride resin powder in the cavity C of the lower mold 23 of 2 by the slush molding method, and then a foam layer 9 of the same polyvinyl chloride resin is formed inside the skin 10. . Therefore, there is not necessarily a clear boundary between the two.

Next, the insert member 12 is temporarily fixed to the cavity forming side wall 24x of the upper die 24 using a magnet. At this time, the protrusion 25 is slid into the recess 16a of the non-coated portion 16.

In this state, overlap the lower mold 23 and the upper mold 24 to form the cavity C.
is formed, and the setting of the insert member 12 in the cavity C is completed. Then, a foamable polyurethane resin is insert-molded into the cavity C.

When the mold is opened after insert molding, a box-shaped molded product 26 is obtained as shown in FIG. The bottom part 2 of this molded product 26
Unnecessary portions of 7 are cut off using a cutter 28, and decoration or other processing is applied as necessary.

In this way, by using the insert molding die 22 of the present invention, it becomes possible to attach the insert member 12 inside the concave molded product 26. Furthermore, unlike the prior art, holes 54 are not formed on the surface of the synthetic resin molded product 26, so there are no design limitations.

[Uses of molded product] The molded product 26 obtained as described above is used for various purposes. For example, as shown in FIG.
can be used as an outer case 3 of a console box 1 of an automobile.

In this case, the box body 2, which has a substantially U-shaped cross section and has a recess 6 formed in its upper inner side, is attached to the outer case 3, and a lid 7 is attached on top of the outer case 3.

The box body 2 and the outer case 3 are connected by a locking member 11
It is locked by. As shown in FIG. 6, this locking member 11 consists of a bifurcated body portion 19 that is inserted into the locking hole 15 of the insert member 12, and a head portion 20 that locks the box body 2 to the insert member 2. It is formed. A non-return portion 21 is provided on the outer periphery of the tip of the body portion 19, and is adapted to be caught on the non-coated portion 16.

In the console box 1 of this embodiment, there is no extra gap between the side part of the box body 2 and the inner part of the outer case 3.

Further, since the insert member 12 is formed of a sheet metal, the strength of the insert member 12 is high, and the insert member 12 can be made thinner than an insert member manufactured from other materials such as synthetic resin. Therefore, the outer case 3 itself can be made thinner.

In this way, the attachment of the box body 2 to the outer case 3 makes it possible to relatively increase the space inside the box body 2 in terms of both the structure and the material of the insert member 12, making it easier to install a telephone, etc. .

The present invention is not limited to the above embodiments, but includes, for example:
As shown in FIG.
6 and multiple stop portions 29, and a corresponding number of projections 25 may be provided on the upper mold 24.

Effects of the Invention As detailed above, the present invention provides a molded product having a cavity in which resin does not enter on the back side of the non-covered part of an insert member fixed to the insert molded product using a mold having a simple structure. It is possible to manufacture the molded product, and as a result, it is possible to obtain a molded product to which a locking member or the like can be attached to the non-coated portion.

[Brief explanation of drawings]

Figures 1 to 8 are drawings related to the example, where Figure 1 is a longitudinal cross-sectional view of the example after insert molding, Figure 2 is a partial perspective view of the example after slush molding, and Figure 3 is also a vertical cross-section. Figure, 4th
The figure is a partial perspective view showing how the protrusion and insert member are stacked,
5 is a perspective view of the insert member, FIG. 6 is a perspective view of the locking member, FIG. 7 is a partial perspective view of the console box, FIG. 8 is a perspective view showing another aspect of the locking member, and FIG. 9 is a perspective view of the locking member. The figure is a partial longitudinal sectional view of a molded product according to the prior art.

Claims (1)

[Claims] 1. Consisting of a fixed mold (23) and a movable mold (24), an insert member is placed on the cavity forming side wall (24x) of at least one of both molds (23, 24). (12) A mold for insert molding, characterized in that a substantially tongue-shaped projection (25) is provided to cover the uncoated portion (16). 2. The insert member (12) is formed by press-molding a metal plate, and a recess (16a) is formed on the back side of the non-coated portion (16), and the recess (16a) is used for forming the cavity. The insert molding die according to claim 1, characterized in that it is configured to be covered by a tongue-shaped projection (25) formed on the side wall (24x).