JP2594138Y2 - Foaming equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foaming mold apparatus used for producing a foam molded article.

[0002]

2. Description of the Related Art Foam molded articles such as polyurethane foam (polyurethane foam) are widely used, for example, for seat cushions or instrument panels of automobiles. For example, for a foam molded product such as an instrument panel, a method of integrally molding a laminated structure composed of a skin, a foam, and a core material using a foaming mold in which a skin material and a core material are provided in advance is used. Has been taken.

[0003] A concave portion for accommodating small items is sometimes provided on the upper surface of an instrument panel of an automobile.
By putting an object in this recess, even if inertia force due to sudden start and stop of the car or centrifugal force when steering the car left and right works, the thing put in the recess can jump out of the recess. Is prevented.

[0004] In order to form such a concave portion on the upper surface of the instrument panel, it is necessary to manufacture a foam molded product having an undercut portion on the entire circumference, and a decorative panel or the like is fitted into the undercut portion. The appearance of the recessed portion is improved.

Conventionally, when manufacturing a foam molded product having an undercut portion on the entire circumference, a nest that can be divided is set in a lower mold, and when the molded product is released, the nest is removed together with the nest to remove the nest from the molded product. After removing the insert, the insert was set in the lower mold again and subjected to foam molding.

[0006]

In the method of manufacturing a molded article having an undercut on the entire circumference using the nest as described above, it is necessary to prepare a large number of nests which can be divided, so that the cost of the molding die is increased. There was a problem of becoming. Furthermore, since it is necessary to release the molded product together with the nest when removing the molded product and then remove the nest from the molded product, there is a problem that the number of steps of the demolding operation is increased.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a foam molding which can easily and inexpensively produce a foam molded article having a ring-shaped undercut portion. It is to provide a mold device.

[0008]

SUMMARY OF THE INVENTION A ring-shaped under member made of an elastic material having a plurality of small projections protruding inward is provided integrally with a projection having a ring-shaped groove all around its circumference. The small projection is detachably attached to the projection so that the small projection fits into the ring-shaped groove.

[0009] Then, the skin is set on the lower mold so as to cover the ring-shaped under member, the core material is set on the upper mold, and the foaming stock solution is formed in the cavity defined by closing the upper mold and the lower mold. Is made to foam.

[0010]

When the foaming stock solution is foamed in the cavity and the mold is removed, the small protruding pieces of the ring-shaped under member come off the ring-shaped groove formed in the convex portion. It is easily removed. By removing the ring-shaped under member from the molded product by hand, it is possible to easily produce a molded product having a concave portion with an undercut portion formed on the entire circumference.

When the ring-shaped under member is reset, the ring-shaped under member can be easily reset simply by fitting the small protruding piece into the ring-shaped groove of the projection formed in the lower die. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. Referring to FIG. 1, an instrument panel portion of an automobile is shown as a foam molded product, and a recess 4 for accommodating small articles is formed near the passenger seat of the instrument panel 2. Instrument panel 2
Is manufactured by foaming a foam 8 such as polyurethane between the core material 6 and the skin 10 as shown in FIG.

An undercut portion 16 is formed on the entire periphery of the concave portion 4 of the instrument panel 2, and the decorative panel 12 having a cloth 14 is fitted into the undercut portion 16 to provide a product. The recess 4 is formed.

Next, with reference to FIGS. 3 to 6, a description will be given of an embodiment of a foaming type apparatus for manufacturing an instrument panel having a recess having an undercut formed on the entire circumference as described above.

Referring to FIG. 3, the foaming mold apparatus 20 is constructed by pivotally connecting an upper mold 26 to a lower mold 22 by a hinge 24. The lower mold 22 is integrally formed with a convex portion 28 having a flat top. As shown best in FIG. 4, the convex portion 28 has a ring-shaped groove 28a formed over the entire circumference thereof.

Reference numeral 30 denotes a ring-shaped under member made of an elastic substance such as rubber or urethane rubber, and has a plurality of small projecting pieces 30a projecting inward. The ring-shaped under-member 30 is attached to the projection 28 so that the small projection 30a of the ring-shaped under-member 30 is fitted into the ring-shaped groove 28a of the projection 28.

FIG. 3 shows a state in which the ring-shaped under member 30 is attached to the projection 28 of the lower mold 22.
A partially enlarged view is shown in FIG. The skin 10 is set on the lower mold 22 so as to cover the ring-shaped under member 30, and the urethane foam stock solution is injected into the lower mold (cavity), and then the upper mold 26 on which the core material 6 is set is closed to close the mold. do. When the urethane foaming stock solution is sufficiently foamed and then released from the mold, the instrument panel 2 in which the core material 6, the urethane foam 8 and the skin 10 are integrally formed as shown in FIG. 6 is manufactured.

At the time of removal from the mold, the ring-shaped under member 30
Small protruding piece 30a is disengaged from ring-shaped groove 28a formed in lower projection 28, so that ring-shaped under member 3 is formed.
Numeral 0 is removed from the lower mold 22 together with the instrument panel 2 as a molded product.

By removing the ring-shaped under member 30 from the instrument panel 2 by hand, it is possible to manufacture an instrument panel having a concave portion in which the undercut portion 16 is formed on the entire circumference. By fitting the decorative panel 12 into the undercut section 16, FIG.
In addition, the concave portion 4 as shown in FIG. 2 can be formed.

The resetting of the ring-shaped under member 30 is performed as follows.
By fitting the small protruding piece 30a into the ring-shaped groove 28a formed in the convex part 28 of the lower mold 22, it can be easily performed.

[0021]

[Effects of the Invention] Since the present invention is constructed as described in detail above, a complicated shaped nest is not required for producing a foam molded article having a ring-shaped undercut portion.
This has the effect of reducing the mold cost and improving the moldability by reducing the number of steps for removing the mold.

[Brief description of the drawings]

FIG. 1 is a perspective view of an instrument panel of an automobile.

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

FIG. 3 is a cross-sectional view of the foam mold apparatus according to the embodiment of the present invention in a mold closed state.

FIG. 4 is an explanatory view showing a state in which a ring-shaped under member is attached to a lower mold projection.

FIG. 5 is an enlarged view of a part B of FIG. 3;

FIG. 6 is a cross-sectional view of the foam mold apparatus according to the embodiment with the mold opened.

[Explanation of symbols]

 2 Instrument panel (foam molded product) 6 Core material 10 Skin 20 Foaming device 22 Lower mold 26 Upper mold 28 Convex part 28a Ring groove 30 Ring under member 30a Small piece

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 31:58

Claims (1)

(57) [Scope of request for utility model registration] 1. A foaming mold apparatus for producing a foamed molded product by foaming a foaming stock solution in a cavity defined by an upper mold and a lower mold, wherein a convex portion having a ring-shaped groove all around the lower mold. A ring-shaped under member made of an elastic material having a plurality of small protruding pieces protruding inward and detachably attached to the convex portion so that the small protruding pieces fit into the ring-shaped grooves. Setting, setting a skin on the lower mold so as to cover the ring-shaped under member, setting a core material on the upper mold, and foaming in the cavity defined by closing the upper mold and the lower mold. A foaming device characterized by foaming a stock solution.