JPH09117922A - Stamping mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yield of thermoplastic resin used as the material of base material at the molding of the interior trim material or the like of an automobile through stamping. SOLUTION: An auxiliary mold 6, which is vertically slidable under the state being tightly contact with the outer peripheral wall 3A of the bottom mold 3 of a stamping mold 1, is arranged so as to check molten matter 4 from leaking between a top mold 2 and the bottom mold 3 at the pressing of the thermoplastic resin molten matter 4 put between the top mold 2 and the bottom mold 3 of the stamping mold 1 in order to produce a base material and, at the same time, fix a skin material 5 to the base material by pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamping mold used for manufacturing interior materials such as automobile door trims, rear parcels and ceiling materials.

[0002]

2. Description of the Related Art A stamping molding method is one in which a thermoplastic resin melt is placed on a lower mold of a stamping mold composed of an upper mold and a lower mold, and the thermoplastic resin melt is separated between the upper mold and the lower mold. It is a method of pressing in between to form a predetermined shape. Door trims, rear parcels, ceiling materials and the like of automobiles are composed of a base material made of a thermoplastic resin and a skin material attached to the surface of the base material. In this case, the thermoplastic resin melt placed on the lower die (3) of the stamping die (1) as shown in FIG.
The skin material (5) is placed on (4), and the thermoplastic resin melt (4) is pressed between the upper mold (2) and the lower mold (3) to form a base material and Press the skin material (5) onto the base material. Therefore, the clearance C between the upper mold (2) and the lower mold (3) of the stamping mold (1) is set to be the sum of the thickness of the base material and the thickness of the skin material.

The skin material (5) having various thicknesses is used depending on the grade of the interior material. Therefore, conventionally, it is necessary to prepare stamping molds having various clearances C corresponding to the thickness of the skin material (5). However, preparing stamping dies with various clearances C as described above causes a large increase in equipment cost. Therefore, by using the stamping dies (1) with clearance C set assuming the skin material of maximum thickness. It is compatible with skin materials of various thicknesses.

[0004]

However, in such a stamping mold (1), when a skin material (5) having a thickness smaller than the maximum thickness of the skin material is used, the stamping mold (1 ) A skin material (5) existing between the outer peripheral wall (3A) of the lower mold (3) and the inner peripheral wall (2A) of the upper mold (2), and the outer peripheral wall (3A) of the lower mold (3). There is a problem that a gap S is formed between them and the thermoplastic resin melt (4) leaks into the gap S to form a flash, which deteriorates the yield of the melt (4). Furthermore, when the length l drawn into the gap S between the upper mold (2) and the lower mold (3) is long, the skin material (5) is difficult to stretch. There is a problem that it is torn and the thickness is reduced. However, if the length l is shortened, then the thermoplastic resin melt (4) leaks from the terminal before the upper mold (2) inner peripheral wall (2A) and the lower mold (3) outer peripheral wall (3A) do not overlap. start,
As shown in FIG. 6, there is a problem that a large flash (4A) consisting of a leaked portion of the thermoplastic resin melt (4) is formed after molding.

[0005]

Means for Solving the Problems As a means for solving the above conventional problems, the present invention comprises an upper mold (2) and a lower mold (3), and a thermoplastic resin is provided on the lower mold (3). The melt (4) is placed and the skin material (5) is set on the melt (4), and the upper mold (2) and the lower mold
(3) The thermoplastic resin by pressing between
A stamping molding die (1) for producing an interior material comprising a base material (4A) comprising (4) and the skin material (5), comprising:
The clearance C _max between the lower mold (3) and the lower mold (3) is set on the assumption that the skin material (5) having the maximum thickness is provided, and the clearance C _max is closely adhered to the outer peripheral wall (3A) of the lower mold (3). Auxiliary type that can slide vertically
The present invention provides a stamping mold (1) in which (6) is arranged.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a stamping mold (1) of the present invention comprises an upper mold (2), a lower mold (3) and a lower mold.
Auxiliary mold (6) closely attached to the outer peripheral wall (3A) of (3)
The auxiliary mold (6) is slidably fitted in the guide groove (7) provided in the peripheral portion of the lower mold (3), and is upwardly moved by the spring (8). Being energized. Then, as shown in FIG. 2, the clearance C _max between the inner peripheral wall (2A) of the upper mold (2) and the outer peripheral wall (3A) of the lower mold (3) is set assuming a skin material having the maximum thickness. .

The thermoplastic resin melt (4) is placed on the lower mold (3) of the stamping mold (1). The thermoplastic resin melt (4) is, for example, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride,
Polystyrene, polyvinyl acetate, fluororesin, thermoplastic acrylic resin, thermoplastic polyester, thermoplastic polyamide, thermoplastic urethane resin, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, etc. It is a melt of the thermoplastic resin of. Further, a skin material (5) is set on the melt (4). The skin material (5) is, for example, artificial leather such as polyvinyl chloride or polyamide, leather, fiber knitted woven fabric or nonwoven fabric such as polyester fiber, polyamide fiber or polyvinylidene chloride fiber, or these and polyurethane foam, polyethylene foam, polypropylene. Foam,
It is a laminated material or the like with a plastic foam such as polyvinyl chloride foam, and is supported by the jig (9).

The upper mold (2) of the stamping mold (1) is lowered, and the lower mold is put through the skin material (5) as shown in FIG.
(3) The above thermoplastic resin melt (4) is pressed, and the melt (4) is molded into a predetermined shape as shown in FIG. 3 to form a base material (4A) and the skin material (5). Is pressed onto the base material (4A). At this time, the auxiliary mold (6) of the lower mold (3) is pushed by the peripheral portion of the upper mold (2) and descends.

When the thickness of the skin material (5) is smaller than the expected maximum thickness, as shown in FIG. 3, the inner peripheral wall (2A) and the lower mold of the upper mold (2) of the stamping mold (1) Outer wall of (3)
A gap S having a length 1 is formed between the melt (4) and (3A), and the melt (4) leaks into the gap S, but the melt (4) is the outer peripheral wall (3A) of the lower mold (3). It is blocked by an auxiliary mold (6) that is in close contact with, and the amount of leakage is controlled to a minimum. In this case, the skin material (5) is the upper mold (2), the inner peripheral wall (2A) and the lower mold (3) for the length l of the gap S at the end.
Although it is drawn in between the outer peripheral wall (3A), as shown in FIG. 4, when the skin material (5) having the maximum thickness d _max is used, the length l of the gap S is 0, that is, the gap S occurs. If not set, the length l of the gap S, which occurs when using a skin material (5) thinner than the maximum thickness d _max , minimizes the retraction of the skin material (5). (5) It is possible to prevent breakage and reduction in thickness. In this case, as shown in FIG. 2, before the inner peripheral wall (2A) of the upper mold (2) and the outer peripheral wall (3A) of the lower mold (3) do not overlap with each other, the thermoplastic resin melt (4) is melted into the mold ( Although reaching the end of 1), leakage of the thermoplastic resin melt (4) is prevented by the auxiliary mold (6).

[0010]

As described above, in the present invention, the leakage of the thermoplastic resin melt during the stamping molding is restricted to the minimum, so that the yield of the thermoplastic resin is improved.

[Brief description of the drawings]

 1 to 3 show one embodiment of the present invention.

FIG. 1 is a sectional view of a stamping mold.

FIG. 2 is a sectional view of an end portion of a stamping mold during molding.

FIG. 3 is a cross-sectional view of the end portion of the stamping mold at the end of molding.

FIG. 4 is a cross-sectional view of an end portion of a molding die when a skin material having a maximum thickness d _max is used. FIGS. 5 and 6 show a conventional example.

FIG. 5 is a sectional view of an end portion of a stamping mold.

FIG. 6 is a sectional view for explaining a leaked state of the thermoplastic resin melt at the end portion of the stamping mold.

[Explanation of symbols]

 1 Stamping mold 2 Upper mold 3 Lower mold 3A Outer wall 4 Thermoplastic melt 4A Base material 5 Skin material 6 Auxiliary mold

Claims (1)

[Claims] 1. A mold comprising an upper mold and a lower mold, wherein a thermoplastic resin melt is placed on the lower mold, a skin material is set thereon, and pressing is performed between the upper mold and the lower mold. A stamping molding die for manufacturing an interior material composed of a base material made of the thermoplastic resin and the skin material, wherein the clearance between the upper die and the lower die is set assuming a skin material having a maximum thickness. The stamping molding die is characterized in that an auxiliary die capable of vertically sliding is arranged in close contact with the outer peripheral wall of the lower die.