JPS60227B2 - Method for manufacturing decorative parts - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a decorative member.

Materials for stamping molding have been recently developed, and the demand for them has increased rapidly in recent years. The material for stamped molding is a thermoplastic resin reinforced with long glass fibers, and has better physical properties such as strength, rigidity, and impact resistance than conventional glass-reinforced thermoplastic resins for injection molding. It is generally excellent in terms of productivity, and the molding cycle is 1/2 to 1'3 shorter than that of injection molding. On the other hand, in the case of materials for stamping molding, especially materials for stamping molding reinforced with polypropylene resin, "
It has the disadvantage that the glass fibers are protruding, making it look unpleasant, and the surface finish after molding is not satisfactory. Therefore, this stamping material can be used directly on invisible structural parts or otherwise
It is necessary to devise ways to cover interior and exterior parts that require strength by covering them with a decorative outer sheet with a clean surface, such as PVC leather coated with foamed urethane. When covering a stamping molded product (a molded product press-molded with a stamping molding material) with the decorative outer skin sheet, it is necessary that the uneven surface of the stamping molded product is wrinkle-free and fits neatly, and the decorative outer skin sheet There is a problem in that the stamping molded product and the stamping molded product must be firmly joined. In order to solve these problems, the decorative outer skin sheet is vacuum-formed using a stiff sheet, such as one with some thickness and hardness, or a low-foam sheet, and the decorative outer skin sheet is This is a method of covering the stamping molded product and bonding it mechanically, chemically, or electrically (high frequency, ultrasonic, etc.).

In this method, (1) the vacuum-formed decorative outer sheet shrinks due to thermal deformation, which tends to create gaps between it and the stamped product; ■In addition to stamping molding process, vacuum molding process,
There is a joining process, which can lead to quality problems. ■Vacuum forming machine and bonding equipment are required. ”
However, the technology has not yet been sufficiently developed. Therefore, an object of the present invention is to provide a molding method for stably and economically attaching a decorative outer skin sheet to a stamping molded product. An object of the present invention is to provide a novel method for manufacturing a decorative member in which a decorative outer skin sheet is attached at the same time.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In the upper part of the diagram, 1 is a plate-shaped material made of glass fiber la and resin (polypropylene, nylon, etc.) lb. If this material 1 is made of, for example, glass fiber la and polypropylene lb, the
When the material 1 is preheated by infrared rays or the like to a melting temperature of The molten polypropylene 2b clings to the glass fibers 2a, and the workpiece 2 is transformed into a substantially plate-shaped workpiece 2 whose overall thickness is 3 to 4 times greater than the thickness of the material 1. The plate-shaped material made of glass fibers (LA) and nylon will not be described in detail, but unlike the case of polypropylene, it is transformed into a highly viscous, slurry, substantially plate-shaped workpiece. Next, the structure of one embodiment of the decorative sheet 3 will be described based on FIG.

This decorative sheet 3 consists of an outer skin sheet 4 and an inner skin sheet 5. The outer skin sheet 4 is made of, for example, PVC leather with a pot pattern, and has very thin fibrous hairs 4 on the back side.
It is an integral sheet of thermoplastic resin with the part a exposed. Also,
The inner skin sheet 5 is a smooth thermoplastic resin sheet that is bonded to the back surface of the outer skin sheet 4 by adhesive bonding or the like, and the thickness should be selected depending on the material, but the thickness is 0.1 m/~.
It is desirable to aim for 0.3 to 0.8 m' of skin, preferably 0.3 to 0.8 m' of skin. This endothelial sheet 5 has at least 1'
An aperture 5a having a diameter of preferably 2 m' to 7 cm or a medium is opened. Furthermore, the structure of another modified example of the decorative sheet 3 will be explained based on FIG.

This decorative sheet 3 is a variation of the fibrous whiskers 4a of the outer skin sheet 4 in FIG. Sheet 6 is outer skin sheet 4 and inner skin sheet 5
It has a sand-and-join structure. Also,
The structure of yet another modified example of the decorative sheet 3 will be explained based on FIG.

This decorative sheet 3 is a fibrous sheet 6 in FIG.
is replaced with a sheet made of foamed resin or elongated foamed material that has a certain thickness to give it elasticity.
This sheet is sandwiched and joined between an outer skin sheet 4 and an inner skin sheet 5. The foaming ratio and material of the sheet 7 are determined depending on the required quality, but the foam structure is made of open cells.

Next, ``The configuration of the tapping press apparatus 10 will be explained based on the drawings from FIG. 5 to FIG. 7.

11 is an upper bolster that can be moved up and down, and an upper base 12
is fixed by a fixing means such as a bolt (not shown).

Reference numeral 18 denotes an upper mold, which is fixed to the upper base 12 by means of fixing means such as bolts (not shown).

Reference numeral 14 denotes a plurality of clampers attached to the sides of the upper die 13.

13a is a recessed portion of a predetermined shape formed on the lower surface of the upper mold 13.

16 is inside the upper mold 13 and in the recess 13a.
There are many scars created near the. This wound 16 is formed by passing hot water or oil into the upper mold 13.
It has the function of cooling and heating. 17
is a fixed lower polster, inside which a plurality of cushion pins 18 are provided so as to be movable up and down by hydraulic pressure.

A lower base 19 is fixed to the lower bolster 17 by fixing means such as bolts (not shown).

This lower base 19 is provided with a through hole 20 through which the cushion pin 18 can go in and out. A plurality of blocks 21 are fixed to the lower base 19 by fixing means such as bolts (not shown).

Reference numeral 22 denotes a lower die, which is fixed to the block 21 by fixing means such as bolts (not shown).

Reference numeral 22a denotes a convex portion formed on the upper surface of the lower mold 22 and has a shape that fits the shape of the recess 13a of the upper mold 13.

Numeral runners 23 are provided inside the lower mold 22 and close to the convex portion 22a.

This wound canal 23 has a function of cooling or heating the lower mold 22 by passing hot water or oil therethrough. And 24 is a plurality of through holes formed in the lower die 22. An extrusion pin 25 is inserted into each through hole 24 so as to be movable up and down. The lower end 25a of the push-out pin 25 is clamped and fixed between upper and lower plates 26, 27. The upper and lower plates 26 and 27 are provided so as to be able to move up and down within a space 28 surrounded by the lower base 19, the block 21, and the lower mold 22.
The method for manufacturing a decorative outer skin sheet, which is the main part of the present invention, will be explained in detail.

First, as shown in FIG.
A prescribed amount of the preheated workpiece 2 shown in FIG. It is fixed with a clamper 14. Then, before the preheated workpiece 2 has cooled down and hardened, the upper bolster 11 is lowered and the upper mold 13 is moved to the lower mold 22, as shown in FIG. Lower the bales until they reach the desired level.

By closing the upper mold 13 and the lower mold 22 in this way, the decorative sheet 3 comes into contact with the preheated workpiece 2, receives the heat of the workpiece 2, and is brought into contact with the upper mold. 13, and the workpiece 2 expands along the convex portions 22a of the lower mold 22. At this time, since the lower surface of the inner skin sheet 5 constituting the decorative sheet 3 is smooth, the workpiece 2 quickly and evenly spreads between the inner skin sheet 5 and the convex portion 22a of the lower die 22. It spreads. When the upper mold 13 and the lower mold 22 are completely closed and a predetermined pressing force is applied from the upper mold 13 to the lower mold 22, the decorative sheet 3 is formed in the recess 1 of the upper mold 13.
3a so as to be stretch-molded without wrinkles,
The workpiece 2 that spread and flowed along the convex portion 22a of the lower mold 22 on the lower surface of the decorative sheet 3 spreads along the convex portion 22a of the lower mold 22.
When flowing along the direction a, a part of the workpiece 2 passes through the closed part 5a of the inner skin sheet 5 constituting the decorative sheet 3 and extends from the outer skin sheet 4 as shown in FIG. The existing fibrous whiskers 4a or the fibrous sheet 6, or the sheet 7 as shown in FIG. In this way, the workpiece 2
and the decorative sheet 3 are integrally joined 3 to form the decorative member 30.
is coated and molded. Finally, the method for removing the decorative member 30 will be explained based on FIG. 7. First, remove the clamper 14 of the upper mold 13. Then, move the upper bolster 11 upward. Cushion pin 18 set inside Polster 17
is raised to a predetermined position by the hydraulic pressure through the through hole 20 of the lower base 19. As a result, the tip of the cushion pin 18 pushes up the lower plate 27, the upper plate 26, and the push pin 25 integrally. "The tip of the extrusion pin 25 protrudes from the through hole 24 of the lower mold 22 and pushes out the cooled and hardened decorative member 30 above the lower mold 20. In this way, the decorative member 30
can be easily removed. As described above, according to the present invention, on the one hand, a material made of a plate-shaped thermoplastic resin material reinforced with glass fiber is prepared, and this material is preheated to form a workpiece, and on the other hand, the lower surface is smooth. A decorative sheet consisting of an inner skin sheet having a plurality of partial holes and an outer skin sheet joined to the inner skin sheet at appropriate intervals is prepared. On the other hand, the preheated workpiece is placed on the convex part of the lower mold, and then the upper mold and the lower mold are placed at a predetermined distance. By bringing them close together, the preheated workpiece enters uniformly between the inner sheet and the outer sheet of the decorative sheet and is solidified into a predetermined shape by the concave portions of the upper mold and the convex portions of the lower mold. The decorative member is then removed from the upper mold and the lower mold, so that the following effects can be obtained. As described above, according to the present invention, the workpiece can be easily and securely joined to the decorative sheet regardless of its resin material, and can be used as a high-quality interior and exterior decorative component. Decorative parts can now be manufactured.

Furthermore, the vacuum forming process and the bonding process can be omitted, making it possible to manufacture decorative members as interior and exterior decorative parts easily and very economically.

[Brief explanation of drawings]

All the figures relate to the method for manufacturing the decorative member of the present invention.
Fig. 1 is a perspective view clearly showing how the material is made into a workpiece, Fig. 2 is a sectional view showing one embodiment of the decorative sheet, and Fig. 3 is a modified example of the decorative sheet. 4 is a sectional view showing yet another modified example of the decorative sheet, FIG. 5 is a partially cutaway front view of the stamping press device before it begins manufacturing, and FIG. 6 shows it after it has entered the manufacturing process. FIG. 7 is a partially cutaway front view of the stamping press device, showing the state in which the decorative member is removed after manufacturing, and FIG. 8 is an enlarged sectional view of the decorative member. be. 1: Material, 2: Workpiece, 3: Decorative sheet, 4: Outer skin sheet 5: Inner skin sheet, 5a: Partial hole, 13: Upper mold, 13a: Recessed part, 22: Lower mold, 22a: Recessed part, 30 : Decorative member. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Claims] 1. On the one hand, prepare a material made of a plate-shaped thermoplastic resin material reinforced with glass fiber, preheat this material to form a workpiece, and on the other hand, prepare a material made of a plate-shaped thermoplastic resin material reinforced with glass fiber, and on the other hand, have a smooth lower surface and a plurality of partial holes. A decorative sheet consisting of an inner skin sheet and an outer skin sheet joined to the inner skin sheet at an appropriate interval is prepared, and then, on the one hand, the decorative sheet is placed in the upper mold so as to cover the recessed part of the upper mold. installation,
On the other hand, the preheated workpiece is placed on the convex part of the lower mold, and then the upper mold and the lower mold are brought close to each other until a predetermined distance is reached, so that the preheated workpiece is heated. The workpiece is uniformly inserted between the inner skin sheet and the outer skin sheet of the decorative sheet, and is solidified into a predetermined shape by the recesses of the upper mold and the projections of the lower mold, and then the workpiece is used as a decorative member. A method for manufacturing a decorative member by removing it from an upper mold and a lower mold.