JPH0467919A - Manufacture of deep drawn resin molding with skin - Google Patents

Abstract

PURPOSE:To obtain a deep drawn resin molding having a satisfactory skin which gets to fit to a deep drawn shape well by injecting a molten resin to a projecting part corresponding to the deep drawn shape and heating the skin part covering the deep drawn shape during the process of pressing by means of pairs molds. CONSTITUTION:A cavity mold 5 having a supporting means 10 which supports an outermost layer 12 is caused to descend and to halted for a time as the skin 12 of the cavity mold 5 comes near a projecting part 2A of a core mold 1. Then, a molten resin 13 is injected from a first injection gate 4A to the projecting pat 2A, and the skin part is heated with the heat of the so injected molten resin 13. Thereafter, the molten resin 13 is injected from the second injection gates 4B of the core mold 1, fed to the molding face of the core mold 1. The molten rein 13 is injected in an amount capable of sufficiently covering the shape of the molded S from the first injection gate 4A and the second injection gates 4B. In the case where a core mold without the second injection gates 4B is used, the molten resin 13 is fed directly into the molding face 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a method for producing a deep-drawn resin molded body with a skin, such as a deep-drawn door trim of an automobile.

BACKGROUND ART Automobile door trims are generally manufactured by simultaneous press molding of a skin and a molten resin. In the case of a deep-drawn door trim, after preheating the skin, as shown in FIG.
The core mold 22 is then supported by a clamp 24.
The molten resin 13 is injected onto the molding surface 26 from the injection gate 25, and the core mold 22 and the cavity mold 23 are pressed together as shown in FIG. The pressed molds are cooled and demolded to obtain a deep-drawn door l-') product 27 in which the resin layer 26A and the skin 21 are bonded and molded, as shown in FIG.

[Problem to be solved by the invention] However, the conventional deep-drawn door trim 27 described above
In this manufacturing method, the heated skin 21 is supported between the two molds and the temperature of the skin 21 drops, and the surface of the molded object for door trim may be cracked, wrinkled, or terry, resulting in poor appearance. There was a problem that caused a malfunction and a defective product.

Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and to create a door trim that can produce a molded product with good deep drawing without forming defects such as surface skin, runout, grain flow, or burr. An object of the present invention is to provide a method for manufacturing a deep-drawn resin molded body with a skin.

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention has a molding surface of a cavity mold having a deep-drawn shape portion, and a convex portion corresponding to the deep-drawn shape portion of the cavity mold. Between the molding surface of the core mold,
A method for obtaining a resin molded article with a skin by supporting a heated skin, supplying molten resin to the molding surface of the core mold, and pressing both molds to simultaneously mold the skin and the molten resin, the method comprising: The mold has a mold structure including a first injection gate that supplies molten resin from the outer surface of the core mold to the convex portion of the molding surface of the core mold, and when pressing both molds, the molten resin is injected from the first injection gate. is supplied to heat the skin portion disposed in the deep-drawn shape portion.

[Function] During pressing of both types, the skin portion to be deep drawn is heated by the heat of the molten resin injected from the first injection gate. The skin and molten resin are simultaneously molded using a press. The skin is molded to fit into the deep-drawn shape of the cavity.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 shows the initial process of obtaining a deep-drawn door trim 17. A skin 12 is supported by support means 10 between the fixed core mold 1 and the cavity mold 5 disposed above. The cavity mold 5 is supported so as to be movable up and down, and the lower surface of the cavity mold 5 is a molding surface 6 that is entirely concave and has a deep drawn portion 6A.

A frame-shaped support means 10 surrounding the cavity mold 5 is arranged on the outer peripheral side of the cavity mold 5, and the skin 2 can be supported by being fixed with pins 11. The support means 10 of this example is attached to the outer surface 7 of the cavity mold 5 and moves up and down together with the cavity mold 5. Note that the supporting means IO may be of a structure that moves up and down together with the raising and lowering of the cavity mold 5, and is not limited to the means attached to the cavity mold 5 in this embodiment.

The core mold 1 has an upper surface or a molding surface 2, and the molding surface 2 has a shape corresponding to the molding surface 6 of the cavity mold 5. Therefore, the high convex portion 2A of the molding surface 2 is formed to correspond to the deep drawn portion 6A of the cavity mold 5. A first injection cage h4A for injecting the molten resin 13 from the outer surface (outer surface or bottom surface) of the core mold l, in this example, from the bottom surface 3 side is provided through the surface of the convex portion 2A. Further, a second injection gate 4B for injecting the molten resin 13 onto the molding surface 2 from the bottom surface 3 side of the core mold 1 is provided at a suitable location outside the convex portion 2A of the molding surface 2. The first injection game h4A is the convex part 2
The shape of A and the position and number of the second injection gates 4B can be set arbitrarily depending on the shape of the molding surface 2 outside the convex portion 2A. When the cavity mold 5 is pressed into the core mold 1, the skin 12 is sandwiched between the molding surface 6 of the cavity mold 5 and the molding surface 2 of the core mold I, as shown by the imaginary line in FIG. A molded portion S of resin is formed.

The skin 12 is made of a sheet material that penetrates the molten resin 13 or adheres to the molten resin 13. As shown in FIG. 5, the skin I2 of this example is a multilayer sheet in which a cushion layer 9B made of polypropylene foam is laminated on the back side of a soft resin sheet 9A made of a polyvinyl chloride sheet.

As shown in FIG. 6, the skin I2 is placed between the hot air outlets 18, supported by the clamps I9, and heated. After that, the heated skin 12 is placed on the molding surface 6 of the cavity mold 5.
The supporting means 10
Support it to the state shown in Figure 1. Next, as shown in FIG. 2, the cavity mold 5 is lowered with the skin 12 supported on the support means 10, and temporarily stopped when the skin 12 of the cavity mold 5 approaches the convex portion 2A of the core mold l. .

Next, melt-resistant resin 1 is applied to the convex portion 2A from the first injection gate 4A.
3 is injected, and the skin part is heated by the heat of the injected molten resin 13. Thereafter, the molten resin 13 is injected from the second injection gate 4B of the core mold 1 and supplied to the molding surface 2 of the core mold I. The molten resin 13 is injected from the first injection gate 4A and the second injection gate 4B in an amount that satisfies the shape of the molded part S. In addition, a core type (not shown) in which the second injection gate 4B is omitted
When using the molding surface 2, the molten resin 13 is directly supplied to the molding surface 2.

After the molten resin 13 is supplied, the cavity mold 5 is further lowered, and as shown in FIG. 3, the mold is clamped, molded, and cooled. Then, the cavity mold 5 is raised to its original position to obtain a molded body 14 shown in FIG. 4. The molded body 14 has a resin layer 13A and a skin 1.
The moldability of No. 2 was good. As shown in FIG. 4, the molded body 14 is made by cutting the excess outer skin part 12B along the cutting line 16, bending the remaining outer skin part 12A to the back side, and subjecting it to adhesive treatment, as shown in FIGS. The product is a door trim 17 shown in FIG.

The product of the door trim 17 in this example is the skin 12 and the resin layer 13A.
It was well bonded and molded, and the deep drawn part 15 of the skin 12 had a beautiful finish with no wrinkles or looseness.

Although this embodiment has been described with respect to the case of the door trim 17 of an automobile door, the present invention is not limited thereto, and can be applied to a method for manufacturing a deep-drawn resin molded body with a skin.

[Effects of the Invention] The present invention provides a heated skin between the molding surface of a cavity mold having a deep-drawn shape portion and the molding surface of a core mold having a convex portion corresponding to the deep-drawn shape portion of the core mold. In the method of obtaining a resin molded body with a skin by supporting the core mold, supplying molten resin to the molding surface of the core mold, and pressing both molds, when pressing both molds, a convex shape corresponding to the deep drawing shape part is formed. Since the molten resin is injected into the deep-drawn part and the skin covering the deep-drawn part is heated, the skin conforms well to the deep-drawn part, making it possible to obtain a good deep-drawn resin molded body with a skin. That is, in the present invention, the part of the heated skin to be deep-drawn is heated again with the molten resin and press-molded, so the simultaneous molding of the skin and the molten resin is carried out well, and the deep-drawn resin molding with the skin has good moldability. You can get a body.

The obtained molded product has no defective areas such as fraying of the skin, graininess, or texture, and can be finished with a beautiful appearance.

[Brief explanation of drawings]

Figures 1 to 8 show examples of the present invention, Figure 1 is a diagram of the arrangement of the core mold and cavity mold, Figure 2 is a diagram of the injection process of molten resin, Figure 3 is a diagram of the resin molding process, Fig. 4 is a diagram of the shape of the molded body, Fig. 5 is a diagram of the structure of the skin, Fig. 6 is a diagram of the heating process of the skin, Fig. 7 is a perspective view of the TOAT IJ product, and Fig. 8 is Fig. 7nx- ■It is an enlarged cross-sectional view in X-rays. 9 to 11 show a conventional manufacturing method, FIG. 9 is a diagram showing the arrangement of a core mold and a cavity mold, FIG. 10 is a resin molding process diagram, and FIG. 11 is a sectional view of a door trim product. l... Core mold 2.6... Molding surface 4A... First injection gate 5... Cavity mold 6A... Deep drawing shape part 0... Support means 2... Skin 3...・Melted resin 4...Molded body 5...Deep drawing part

Claims (1)

[Claims] A heated skin is supported between a molding surface of a cavity mold having a deep-drawn shape part and a molding surface of a core mold having a convex part corresponding to the deep-drawn shape part of the cavity mold. A method of supplying molten resin to a molding surface and pressing both dies to simultaneously mold a skin and molten resin to obtain a resin molded body with a skin, the core mold being molded from the outer surface of the core mold. The mold structure includes a first injection gate that supplies molten resin to the convex portion of the surface, and when pressing both molds, the molten resin is supplied from the first injection gate and placed in the deep drawn portion. A method for producing a deep-drawn resin molded article with a skin, the method comprising heating the skin part.