JPH02233234A - Joining method for slush-molded member - Google Patents

Abstract

PURPOSE:To make the thickness of a flange part thin, and to improve accuracy in size in the direction of its thickness by a method wherein the flange part for joining a slush-molded member to other members is constituted of a hard insert alone. CONSTITUTION:A thin steel sheet 14 having a shape corresponding to molding protrusions 13 for forming the joining flange part of a member 10 is set covering the front region of said protrusions in a bottom force 12. When a top force 11 is clamped against the bottom force 12, the flat part 14a of the steel sheet 14 is closely contacted to the bottom force 12 and the two-layer structure member 10, and is sandwiched therebetween, and gaps 15 are formed between the other part of the steel sheet 14 and the two-layer structure member 10 and also between the steel sheet 14 and the molding surface of the bottom force 12. When molding is performed by injecting a molten hard-polyurethane resin 3 into these gaps 15, the two-layer structure member 10 is joined onto the exposed steel sheet 14 at the flange part 5, and a three- layer structure where the steel sheet 14 is embedded in the hard-polyurethane resin layer 3 is obtained in other regions than the flange part. A soft part of the two-layer structure member 10 is cut off from the flange part 5 thus obtained, and the steel sheet 14 is left as it is. A flange part 4 of an instrument panel is then placed on said steel sheet 14 to be formed into one body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a technique for combining, joining and integrating members made by slush molding with other members.

[Conventional technology]

For example, when manufacturing a console box for an automobile, as shown in Figure 8, first a skin layer 1 of vinyl chloride is molded using a slang-yu mold, and then a foamed vinyl chloride layer 2 is superimposed on this using a slush mold. The molded and integrated skin layer 1 and foamed vinyl chloride layer 2 are removed from the mold and RII
vI is set in a mold for molding, and hard polyurethane N3 is molded to form a three-layer structure member. In order to join and integrate this with a separately prepared instrument panel, the 9th
As shown in the figure, a flange portion 5 made of a core material provided on a part of the instrument panel is overlapped with the flange portion 4 of the console box and fixed with adhesive or screws.

[Problem to be solved by the invention]

In this joining method, since the foamed vinyl chloride layer 2 is easily deformed by heating etc., it is difficult to achieve dimensional accuracy in the thickness direction, and a step h is likely to occur in the height of the surfaces of the two members to be joined. . Furthermore, since this joint part has a multi-layered structure with four layers overlapping each other, there is a gap of at least 6 to 3 mm.
, which has the disadvantage of requiring more space than other parts.

SUMMARY OF THE INVENTION The present invention aims to solve the problems of the prior art, improve the dimensional accuracy of the joints of slush molded members, and reduce the required space by reducing the thickness.

[Means to solve the problem]

The purpose of this is to respond to the shape of the two-layer structure material when forming a three-layer structure product by laminating a core material on a two-layer structure material consisting of a skin layer and a foamed resin layer obtained by slush molding. Set in the mold with a thin plate insert,
In some areas, the insert is tightly sandwiched between the mold and the two-layer structure so that no molding space is formed, and in other areas, the insert is held between the mold and the two-layer structure and the two-layer structure. A predetermined molding gap is set between the mold and the molding gap, and a hard resin serving as the core +3 is injected into the molding gap. A three-layer structure product is obtained in which the two-layer structure remains, and then the two-layer structure is removed from the bonding area to leave only the insert.
This is achieved by a method for joining slush molded members, which is characterized in that members prepared separately are joined and integrated.

[For production]

According to the present invention, when a two-layer structure material prepared by slush molding is set in a mold for forming a core material to mold a three-layer structure product, an insert is inserted into the mold and the part after molding is Only a portion of the +2 (bonding area) remains in the bilayer structure backed by the insert.

Therefore, it is possible to easily expose only the insert by removing the skin layer and the foamed resin layer in the joint area, and when joining and integrating the second member prepared separately, the thickness of the joint part can be reduced. It is possible to make the thickness extremely thin, increase the dimensional stability in the thickness direction, and make the surfaces of both members flush.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 shows a perspective view of a two-layer material 10 slush-molded as a material for a console box, as in the prior art described above.

This two-layer paulownia structure 10 is set in a RIM molding mold having a molding surface corresponding to the external shape of the paulownia resin in order to laminate the hard polyurethane resin of the third layer as a core material.

To explain the procedure, first, as shown in Figure 2,
/110 is set with its skin N1 in close contact with the molding surface of the second mold 11.

On the other hand, as shown in FIG.
A thin plate 14 having a shape corresponding to that part of the member 10 is set in the front region of the molded convex part 13 forming the joining flange part of the member 10.

In this state, when the upper mold 11 is fitted to the lower mold 12, the flat part 14a of the iron plate 14 is tightly sandwiched between the lower mold 12 and the two-layer structure member 10, as shown in FIG. between the part and the two-layer structure member 10, and between the iron plate 14 and the lower mold 12.
A predetermined molding gap 15 is formed between the molding surface and the molding surface.

Then, when the molten hard polyurethane resin 3 is injected into this molding gap 15 and molding is performed, the exposed iron plate is exposed at the flange part 5 of the molded product corresponding to the flat part 14a of the iron plate, as shown in FIG. A two-layer structure member 10 is bonded on top of 14, and in other areas a three-layer structure is obtained in which the iron plate 14 is embedded in the hard polyurethane layer 3.

Next, as shown in FIG. 6, the portion of the softened two-layer structural member 10 is cut off from the thus obtained flange portion by appropriate means, leaving only the iron plate 14. Then, as shown in FIG. 7, the flange portion 4 of the separately prepared instrument panel is placed thereon and fixed with appropriate means such as screws or adhesive to integrate the two.

〔Effect of the invention〕

As described above, according to the present invention, since the flange portion for joining both members is constructed of only a hard insert, the thickness of the flange portion is reduced, and as a result, the thickness of the joint portion is also reduced and wasted space is saved. It disappears. Furthermore, since the soft two-layer structure member is removed from the joint, it is possible to improve the dimensional accuracy in the thickness direction, and it becomes easy to align the surface heights of the members to be joined.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a slush-molded console box material to which the present invention is applied; FIG. 2 is a perspective view showing the material set in an upper mold during core material molding; Figure 3 is a perspective view showing the insert set in the lower mold, Figure 4 is a sectional view showing both the upper and lower molds are closed, and Figure 5 is the state in which resin is injected into the mold. 6 is a perspective view showing the exposed state of the insert of the joint, FIG. 7 is a sectional view of the joint, and FIG. 8 is a perspective view showing the joint of a conventional console box. FIG. 9 is a sectional view of the same after being joined. DESCRIPTION OF SYMBOLS 1... Skin layer, 2... Foamed vinyl chloride layer, 3... Hard polyurethane layer, 4... Flange part, 10... Two-layer structure member, 11... Upper mold, 12... - Lower mold, 13... Molding convex portion, 14... Steel plate, 15... Molding gap.

Claims (1)

[Claims] 1. When forming a three-layer structure product by laminating a core material on a two-layer structure material consisting of a skin layer and a foamed resin layer obtained by slush molding, a thin plate-shaped insert is molded together with the two-layer structure material. The insert is set in a mold, and in some areas, the insert is held tightly between the mold and the two-layer structure material so that no molding space is created, and in other areas, the insert and the two-layer structure material are held tightly. A predetermined molding gap is set between the material and the mold, a resin serving as a core material is injected into the molding gap, and the bonding area where the two-layer material is laminated is placed on the insert. A slash characterized by obtaining a three-layer structure product with the parts remaining in the area, and then cutting out the two-layer structure part from the joining area to leave only the insert, and joining a separately prepared member thereto to integrate it. How to join molded parts.