JPS6046208A - Cold press forming process - Google Patents

Abstract

PURPOSE:To contrive to stick the parts forming protruded part to be combined, to a main part simultaneously with forming, using the wooden fiber board made at low cost as a main part by a method in which a heated and softened synthetic resin board is laminated on the mesh like back surface of the wooden fiber board so as to cover its opening surface and then it is formed by cold press. CONSTITUTION:The plane wooden fiber board 1 caused to become the core member of the interior parts for an automobile is trim cut into the external form corresponding to the external shape of said interior parts by the dies 4, 5 for trim cut, and an opening 1b is also formed by punching on said board. Thus trimmed wooden fiber board 1 is set on the bottom force 4 of cold press dies such that the uneven surface 1a of its mesh pattern becomes an upper surface. Then, while providing an adhesive layer 7 at the peripheral edge of the opening 1b, a heated and softened synthetic resin board 6 is applied thereto, so as to cover the opening 1b-surface. After its setting, when a top force is lowered, the flange part 6a of the peripheral edge is connected to the peripheral edge of the opening 1b of the wooden fiber board 1, while a protruded part is pressed on the surface of the resin board 6, and a firm connecting condition may be obtained by the anchor effect due to the mesh like unevenness 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a method for applying wood to a core material of an automobile interior material.
#Related to a method of forming convex portions on the surface of a board by a cold press molding method.

(Prior art and its problems) For example, automotive interior materials such as door trims, body sides, and rear parcels are generally made of wood fiber boards, etc., which are generally available at low cost, as a core material, and pad materials and skin materials are laminated and pasted on the surface of the core material. It was completed by doing so.

The core material that makes up such automotive interior materials is generally flat, and is simply trim-cut along its outer shape before being supplied. Some interior materials are designed to create a three-dimensional effect by forming them into curved surfaces rather than flat plates.

The best molding method in this case is to press the wood fiber board by applying heat and pressure to form convex portions in the required areas, but in reality, the entire board is flattened. In order to form a deep-drawn shape in a part of the mold, cracks were generated at the periphery of the convex part due to the drawing, and therefore, such a molding method could not be put to practical use.

In order to improve this defect, it is possible to first replace the core material with a wood fiber board and use a synthetic resin board or a wood fiber board with long IJ strings. The material 1''+9 is expensive, and the latter requires complicated steps such as soaking it in water to soften it when molding.

Therefore, when forming the above-mentioned convex portion, conventionally, when trim-cutting the wood fiber board, first cut out the peripheral edge of the portion corresponding to the convex portion to create an opening.
On the other hand, a separate part such as a plastic injection molded body or a press molded body constituting the convex part is made, and the separate part or product is inserted into the frontage of the wood fiber board by screws or caulking.

However, even with such a forming method, assembling screws or caulking requires man-hours, making the V-shaped structure troublesome, and the convex component parts must be made in a separate process, which increases man-hours and finish. There was a drawback that the number of hanging items increased.

(Object of the Invention) The present invention uses a conventionally used inexpensive wooden string board as the main component, and simultaneously attaches the convex component to be assembled to the wooden m-fiber board at the same time as its molding. The purpose is to make it possible.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention provides a flat wood l! trim-cutting the i-fiber board into an outer shape corresponding to the outer shape of the interior material, and trim-cutting a part of the inner periphery corresponding to the outer shape of the convex portion formed on the surface of the interior material; The trimmed wood fiber board is positioned and installed in a cold press lower mold so that the mesh-like surface on the back side is the top surface, and then a synthetic resin board heated and softened is placed so as to cover the opening surface from which the trim was punched. A process of installing on a wooden V&T board, engaging a cold press upper mold with the lower mold, plastically deforming the synthetic resin board to form a convex part according to the shape of the mold, and at the same time forming a periphery of the convex part. The flange part formed on the board is cut into the edge of the back side of the wooden single-striped board, and is integrally fixed to the wood fiber board for adhesion and anchoring effects.

In the cold press molded body obtained through the above process, separate parts for forming the convex parts are assembled (compared to the case where separate parts for convex parts formed separately on a flat board using the conventional construction method are assembled). Since the body parts can be integrally fixed onto the wood fiber board at the same time as they are molded, the number of man-hours and the amount of work in progress can be reduced.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described in detail in accordance with the process order with reference to the drawings.

1 to 3 show the process sequence of the method of this invention. First, in Fig. 1, a flat wooden kI & 1 board 1 is placed between the trim cutting molds 2 and 3, and placed on the lower mold 2, and by engaging the upper mold 3, the respective mold surfaces are The protruding trim cutters 2a and 3a for the outer circumferential trim perform a trim cut to an outer shape corresponding to the outer shape of the interior material, and a frontage is punched and formed at an appropriate position by the cutpers 2b and 3b. Ru.

Note that the wood fiber board 1 is obtained by binding nails 1 made of pulp or the like with a thermosetting resin such as urea resin, and has a smooth surface and a back surface as shown in FIG. 1(b). As shown in the figure, a mesh pattern of unevenness 1a is formed.

The wood fiber board 1 trimmed as described above is placed on the bottom mold 4 of the cold press mold with the unevenness 1
It is set with a as the top surface.

A recess 4a is formed in the center of the mold surface of the lower mold 4, and the trim punched opening 1b is positioned in correspondence with this recess 4a.

Next, an adhesive layer 7 is provided around the periphery of the opening 1b, and a composite resin plate 6 softened by heating is installed to cover the opening 1b.

This composite resin board 6 is made by adding, for example, 50 parts by weight of wood flour as a filler to 50 parts by weight of polypropylene resin, and molding this into a plate shape using an extrusion molding machine such as a T-die. It is supplied in a converted state.

The adhesive layer 7 may be made of various materials such as solvent, film, powder, etc., but it should have as good adhesion to the composite resin board 6 as possible, and be made of wood material II I.
It is desirable that the material has good adhesion to the C-board 1 as well.

Immediately after the above setting is completed, the upper mold 5 is lowered and the composite resin plate 6 is pressed by the convex portion 5a formed on the mold surface, and the resin plate 6 is pressed as shown in FIG. 6 has a convex portion press-molded on its surface according to the shape of both molds, and a peripheral flange portion 6a is joined to the opening peripheral edge of the wood fiber board 1.

Next, after the composite resin plate 6 is cooled and solidified, both molds 4,
5 is opened and removed from the mold to obtain a core material for an interior component integrated with the composite resin board 6 protruding from the surface of the wood fiber board 1, as shown in FIG.

Further, the flange portion 6a and the opening 1 of the wood fiber board 1
As shown in FIG. 3(b), the mesh-like unevenness 1a is interlocked with the edge of the adhesive layer 7 in a concave-convex manner, so that the bonding effect of the adhesive layer 7 is improved. In addition, a strong bonded state can be obtained due to the anchor effect of the mesh-like unevenness 1a.

Next, what is not shown in FIG. 5 shows a further embodiment of the method of this invention, in which a tapered hole 1c whose diameter increases toward the surface side is formed at the periphery of the opening of the wood fiber board 1. During the cold press molding, the flange portion 6a of the u-synthetic resin plate enters the tapered hole 1G by press pressure to form a wedge-shaped filling portion 6b in the tapered hole 1c.

In this embodiment, in addition to the anchoring effect on the network-like unevenness 1a, a large anchoring effect similar to that obtained by driving a tapered rivet can be obtained, and therefore an adhesive layer is not required.

[Brief explanation of the drawing]

1 to 3 are process explanatory diagrams showing one embodiment of the method of the present invention. FIG. 4 is a perspective view showing the completed state of the product obtained by the above process, and FIG. 5 is a partially enlarged sectional view showing another embodiment of the present invention. 1......Wood fiber board 1a...Mesh unevenness 1b...Opening 2.3...Trim cut mold 4.5...Cold press metal Type 6...Composite resin board (synthetic resin board) 6
a... Flange portion patent applicant Fig. 1 16 4a Fig. 3 Cb)

Claims (1)

[Claims] (1) Trim-cut a flat wooden woven board, which will be the core material of an automobile interior material, into an outer shape that corresponds to the outer shape of the interior material, and also cut it into an outer shape that corresponds to the outer shape of the convex portion formed on the surface of the interior material. Correspondingly, a step of trimming and punching out a part of its inner circumference; positioning and installing the trimmed wood fiber board on a cold press lower die so that its back mesh surface is the −E side, and then cutting out the trimmed wood fiber board; A step of installing a heat-softened synthetic resin board on a wood fiber board so as to cover the punched opening; a cold press upper mold is engaged with the lower mold, and the synthetic resin board is plastically deformed to form the mold shape. At the same time as forming a convex portion corresponding to the convex portion, the flange portion formed at the periphery of the convex portion is bitten into the back opening edge of the wood fiber board, and is fixed integrally to the wood fiber board by adhesive and anchoring effect. A cold press molding method characterized by: