JPS6097816A - Molding method of synthetic resin molded part with skin material - Google Patents

Abstract

PURPOSE:To integrate fabrication with winding-around work of skin material to fabricated part by a method wherein a liner is formed so as to serve as the end surface to the movable force of a mold in order to wind skin material around the liner and over the movable force by vacuum forming and, after that, resin is injected in the mold. CONSTITUTION:A liner 3 is provided to the movable force 1 of a mold. Skin material 4 is vacuum-formed so as to closely contact over the domain ranging from the inside surface of a cavity 6 to the end surface (not shown in fig.) of the cavity or of the liner 3 and further to the side surface and outer surface of the liner 3. Just after the vacuum forming of the skin material 4, the mold is clamped by closely contactng the movable force 1 with the fixed force 2 of the mold. After that, synthetic resin is injection-molded so as to fill the synthetic resin 22 in the cavity 6 so as to integrate the skin material 4 with the synthetic resin 22 in order to mold a predetermined molded part. The molded part 23 is removed from the mold and excess skin materials 25 extending outwards beyond the end parts 24 of the molded part 23 are cut off and removed.

Description

[Detailed description of the invention] Industrial field of application and purpose The present invention involves placing a skin material in advance in a molding die, and integrating the skin material and a synthetic resin molded product during molding of synthetic resin. This invention relates to improving the method for treating skin material at the end of a molded product in a method for molding a synthetic resin molded product, since the skin material is already rolled up and placed at the end of the molded product after demolding. It is an object of the present invention to provide a molding method that can simplify the processing of the ends of a skin material.

Conventional synthetic resin molded products have been coated with knit fabric,
There are products with a skin material such as a sheet or film made of non-woven fabric, polyvinyl chloride or polycarbonate, etc., but such molded products are usually made by setting the skin material in a mold and then The skin material and the synthetic resin are integrated by molding the synthetic resin.

Conventionally, the end of the skin material is wrapped around the end of the molded product for the purpose of improving the appearance of the end of the skin material and preventing peeling of the skin material from the end. ,
In this process, the skin material and synthetic resin are integrally molded as described above, then the molded product is taken out of the mold, and as a separate process, the skin material is cut along the outer shape of the molded product, leaving a margin for wrapping. After that, the wrap-around portion of the skin material is bent and joined to the end of the molded product using adhesive, staples, etc.

For this reason, the conventional method of ``dual series'' requires a large number of man-hours.
The drawback is that the processing cycle time is long.

Although it is possible to cut the ends of the skin material within the molding die, there remain drawbacks such as the ends of the skin material being likely to peel off and beautiful cut ends not being obtained.

Structure of the Invention The present invention provides an undercut type in which the end face of a cavity for molding the end portion of a molded product is formed into an undercut type by the end face of a nesting mold that moves in the same direction as the movable mold, and then the inner surface of the cavity in the movable mold is formed. A series of skin materials are placed over the outer surface of the nesting mold, including the undercut type end surface, and are brought into close contact from the inner surface of the cavity to the end surface of the nesting mold by vacuum forming, and then clamped with the fixed mold. Then, the synthetic resin is molded, and after the molded product is demolded, the outer skin material from the end portion of the molded product is removed, thereby producing a molded product that does not have the above-mentioned defects. This method has been developed to enable molding through simplified steps.

EXAMPLE The drawings show an injection molding mode as one embodiment of the present invention, and in this example, the apparatus shown in FIG. 1 is used.

That is, a movable mold 1, a fixed mold 2, a nesting mold 3, and a clamping device 5 for the skin material 4 are used as molding molds.

A cavity 6 is formed in the above-mentioned movable mold l,
A small hole 8 is opened in the cavity 6 and communicates with a vacuum suction cavity 7 formed in the movable mold 6, and the vacuum suction cavity 7 is communicated with a vacuum pump P through a pipe 10.

Furthermore, the above-mentioned nesting mold 3 has a piston rod 1 of a fluid pressure driven cylinder 11, 12 fixed on the outside of the movable mold l.
3, 14, and the piston rods 13, 14
When it retreats, it comes into close contact with the end of the stationary mold 1, as shown in FIG. 2, and forms an undercut type cavity end face 6' at that end face.

This cavity end surface 6 is a cavity portion that forms the end portion of the molded product.

Note that the small hole 9 that communicates with the vacuum suction cavity 7 of the movable mold 1 mentioned above opens at the end surface 15 of the movable mold 1 with which the nesting mold 3 comes into close contact, and a shield packing 16 is provided on the end surface 15. It is interposed and is configured to seal the contact surface when the nesting mold 3 is brought into close contact with the end surface 15.

The clamping device 5 clamps the skin material 4 between the fixed mold l and the fixed mold 2 as shown in FIG. , sheets or films made of non-woven fabric or synthetic wax such as polyvinyl chloride or polycarbonate are used.
In the case of breathable materials such as sheet fabrics and non-woven fabrics, a non-breathable synthetic resin layer is formed on the side that will come into contact with the synthetic resin that will be molded as described below. If 4 is a material that has no affinity with the synthetic resin to be molded, a synthetic resin or adhesive that is compatible with the synthetic resin to be molded is brought into contact with the back surface of the skin material 4, that is, the synthetic resin to be molded. It shall be applied to the side in advance by painting or blowing.

As shown in FIG. 4, the fixed mold 2 cooperates with the movable mold 1 and the nested mold 3 to close the cavity 6, and is in contact with the synthetic resin injection nozzle 17. A sprue bushing portion 18 and a sprue 19 are formed.

The configuration of the present invention using the above-mentioned device is as follows.

That is, after the nesting mold 3 is brought into close contact with the end surface 15 of the movable mold l by the operation of the hydraulic cylinders 11 and 12, the skin material 4 held by the clamping device 5 is heated by a heating device (not shown). The temperature is raised to a temperature that allows shaping or plastic deformation, and immediately the nested mold 3 is brought into close contact with the opening of the movable mold 1, as shown in FIG. When you do this, the small hole 8.9
A suction action is applied to the cavity 6 through , and the skin material 4 changes from the state shown in FIG. 2 to the state shown in FIG. Further, the mold 3 is vacuum-formed so as to be in close contact with the side surface 20 and outer surface 21 of the mold 3.

Immediately after or simultaneously with the vacuum forming of the skin material 4 described above, the movable mold 1 is brought into close contact with the fixed mold 2 and the molds are clamped. The navigating lamp device 5 is retracted to the standby position at this stage.

Subsequently, injection molding of the synthetic resin is performed, and as shown in FIG. 4, the cavity 6 is filled with the synthetic resin 22.
The skin material 4 is integrated with the synthetic resin 22 to form a predetermined molded product.

After the synthetic resin 22 has solidified, the movable mold 1 is moved to open as shown by arrow A in FIG.
When the molded product 23 made of the skin material 4 and the synthetic resin 22 is moved forward, it is removed from the cavity 6 of the movable mold l, and
At the forward end of the piston rods 13, 14, the state shown in FIG. 5 is reached.

As the movable mold l continues to be linked to the mold opening, the molded product 23 is also removed from the fixed mold 2, as shown in FIG.

Thereafter, the molded product 23 is taken out, and as shown in FIG.
This is the removal of the.

In addition, when removing the above-mentioned excess skin material 25, a folding allowance 26 is left as shown in FIG.
It may be folded inward and bonded with an adhesive or secured with staple teeth of a stapler.

Although the embodiment described above is an example of injection molding, it goes without saying that the same structure can be applied to compression molding, stamping molding, etc.

Effects of the Invention The present invention has the configuration described above, and the cavity end face is formed into an undercut type by the nested end face,
Since the synthetic resin is molded after the skin material is brought into close contact with the end face of the cavity, which is the end face of the insert mold, by vacuum forming, the skin material is brought into close contact with the end of the molded product, and the rolled up molded product can be easily obtained. Therefore, there is no need to involve the ends of the skin material after the molding process, reducing the number of man-hours, and making it possible to form beautiful end parts of the molded product.

Furthermore, since the nesting mold moves in the same direction as the movable mold, the mold structure can be made simple and compact, and the installation area of the equipment can also be reduced.

1

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic vertical cross-sectional view of an example of an apparatus used for carrying out the present invention, and Fig. 2 is a schematic vertical cross-sectional view showing only the movable mold in the first step. , FIG. 3 is a schematic vertical cross-sectional view showing only the movable mold in the second step, FIG. 4 is a schematic vertical cross-sectional view of the device in the third step, and FIG. 5 is a schematic vertical cross-sectional view of the device in the fourth step. 6 is a schematic longitudinal sectional view of the apparatus in the fifth step, FIG. 7 is a longitudinal sectional view of one example of a molded product, and FIG. 8 is a longitudinal sectional view of a different example of a molded product. It is. 1: Movable mold, 2: Fixed mold, 3: Nested mold, 4: Skin material, 6: Cavity, 22: Synthetic resin, 23: Molded product, 2
4: Terminal section. 2 Fig. 5 Fig. 6 Pff j3 4 , - ≦ Rinto 2 JP-A-Sho GO-97816 (5) Fig. 7 Fig. 8] Can Nanami

Claims (1)

[Claims] The end of the molded product is formed into an undercut type by the end face of the molding cavity, which is the end face of the nesting mold that moves in the same direction as the movable mold, and then the undercut of the nesting mold is formed from the inner surface of the cavity in the movable mold. A series of skin materials is applied over the outer surface including the end surface of the cut type, and is closely adhered from the inner surface of the cavity to the end surface of the nested mold by vacuum forming, and the mold is clamped with a fixed mold, and then a synthetic resin is applied. 1. A method for molding a synthetic resin molded product having a skin material, the method comprising: molding the molded product, removing the molded product, and then cutting off the skin material outside the end portion of the molded product.