JPH0378247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a decorative body having a predetermined surface and provided with through holes or recesses at predetermined positions.
More specifically, a plastic sheet or an aluminum sheet with beautiful decorations such as printing or hot stamping is formed into a predetermined shape by vacuum forming or pressing, and then this molded sheet is combined with this molded sheet. After inserting into a female mold having equal surfaces, a press rod slidably provided in the female mold is inserted or press-fitted into a predetermined position of the molded sheet, and then the molded sheet is pressed with this press rod. A method for producing a decorative body, comprising injection molding in a female mold while supporting the molded sheet, and integrally laminating a synthetic resin layer on the back side of the molded sheet to produce a decorative body having through holes or recesses. It is related to.

In the conventional manufacturing of decorative bodies, a decorated plastic sheet or aluminum sheet is formed into a shape with a predetermined surface by vacuum forming or press forming, and after forming, the sheet is penetrated by press processing, etc. Decorative bodies were obtained by drilling holes or recesses, then inserting this molded sheet into an injection mold with accurate positioning, and performing injection molding. As mentioned above, it is extremely difficult to accurately match the through holes or recesses of the molded sheet that have been drilled in advance, so there are drawbacks such as a large number of defective molded products and damage to the mold. Ta.

In particular, molded sheets formed by vacuum forming or press forming are thin and have no core, so they are difficult to handle, and they easily deform during handling or when inserted into an injection mold, and are susceptible to deformation over time due to heat. Wake up,
Therefore, it is extremely difficult to match the pins in the mold with the through holes or recesses in the molded sheet, and the through holes or recesses in the molded sheet and the holes in the injected molded resin layer are finished to have the same cross section. It was quite difficult.

The manufacturing method according to the present invention is a completely new technology developed in view of the drawbacks of the conventional methods, and in particular, after inserting a molded sheet into a female mold, a press that is slidably provided in the female mold is used. The rod is inserted or press-fitted into a predetermined position of the molded sheet, and the outer diameter part of the molded sheet is press-cut, and then the female die into which the molded sheet is inserted is transferred as it is by sliding or rotating. The present invention relates to a technique characterized in that a decorative body is manufactured by inserting a male mold for injection molding into the mold and injection molding a synthetic resin.

To specifically explain one embodiment of the method according to the present invention with reference to the drawings, in Figs. A hemispherical shaped sheet 2 is formed by a forming machine (not shown). Next, this molded sheet 2 is inserted into a press mold 5 consisting of a female mold 3 and a male mold 4 having substantially the same curved surfaces as the molded sheet 2 so that the curved surfaces of both molds match. This female mold 3 also serves as a female mold for an injection mold, and includes a press rod 6.
is slidably attached, and when the mold 5 is closed, its tip can be inserted into the through hole 7 at the top of the male mold 4, and by inserting the tip, the molded sheet 2 A through hole 8 is bored in the mold sheet 2, and the molded sheet 2 is temporarily held by the press rod 6, and when the mold 5 is closed, the unnecessary outer diameter part of the molded sheet 2 is removed. It is constructed so that it can be press cut.

As mentioned above, the molded sheet 2 inserted into the female die 3 and press-cut is rotated together with the female die 3 while being supported by the press rod 6, and is moved to the synthetic resin injection molding section, where it is then injection molded. A male mold 10 for the mold 9 is inserted into the female mold 3, the tip of the press rod 6 is fitted into the recess 11 provided at the top of the male mold 10, and the runner 12 provided in the male mold 10 and A synthetic resin is injected from a gate 13 and a resin layer 14 is integrally laminated and molded on the back surface of a molded sheet 2 to obtain a hemispherical decorative body 15 having a through hole 8 formed by a press rod 6 at a predetermined position. I can do it.

In the above embodiment, an embodiment was described in which a decorative body 15 having a curved outer surface was manufactured.
As shown in FIGS. 10 to 15, the upper surface is flat and only the outer peripheral side surface is curved, and the through hole 8 has a small hole shape.
A decorative body 15 having a window-like through hole 8 can also be manufactured by performing the same process as the above process.

Further, in the above embodiment, the decoration body 15 has a through hole 8.
As shown in FIGS. 16 and 17, the length of the press rod 6 attached to the female mold 3 is shortened, and the tip surface of the press rod 6 and the back surface of the molded sheet 2 are If these are made to be on the same plane, it is possible to form a recess 8' in this portion instead of the through hole 8, as shown in FIG. 18 or 19. In the case of this embodiment, when transparent resin is used, the recess 8' of the decorative body 15
It is possible to construct a transparent window through which the interior can be seen.

In addition to the decorative body 15 having a curved outer surface and the disk-shaped decorative body 15 having a flat upper surface and a curved outer peripheral side surface shown in the above embodiments, a trapezoidal decorative body 15 as shown in FIG. It can be easily manufactured by repeating the same steps as the decorative body 15 by changing only the shape of the decorative body 15.

As described above, the method according to the present invention uses the female die of the press die and the female die of the injection mold, and rotates or slides the female die of the press die and the female die of the injection mold. The inner surface of the female mold is formed into a shape that is almost the same as the outer shape of the molded sheet, and a press rod is slidably provided in this female mold, and the press rod is used to make through holes or holes in the molded sheet. Since the decorative body having a predetermined surface is molded by making a recess and supporting the molded sheet by the press rod, it is possible to form a decorative body with a predetermined surface by making a recess and support the molded sheet by the press rod. There is no need to fit the pins of the molding die into the holes or recesses, and therefore highly accurate molded decorations can be mass-produced inexpensively and reliably. During injection molding, the press rod always holds the molded sheet in a stable state within the female mold, so there is no fear that the molded sheet will move within the female mold due to the pressure of the injected resin, resulting in a pearly luster. By using a plastic sheet with a It is possible to completely prevent the decoration from lowering, and furthermore, when the recess is formed using a transparent resin, a transparent window can be formed as a part of the decorative body.

[Brief explanation of drawings]

FIGS. 1 to 8 are explanatory views showing the method of the present invention, FIG. 9 is a perspective view of the decorative body, and FIGS. 10 to 20 are explanatory views of other examples. 2 is a molded sheet, 3 is a female mold, 5 is a press mold,
6 is a press rod, 8 is a hole, 8' is a recess, 9 is a mold, 13 is a gate, 14 is a resin layer, and 15 is a decorative body.

Claims (1)

[Claims] 1. In a press mold consisting of a female mold in which a press rod is slidably provided and a male press mold having a through hole at the top through which the tip of the press rod can be inserted, a After inserting the molded decorative molding sheet, the mold is clamped, and the press rod is inserted into a predetermined position of the molded sheet while inserting the tip of the female press rod into the through hole of the male press mold. Alternatively, after press-fitting and supporting the molded sheet with the press rod, and then removing the male press mold from the press mold, insert the male mold for injection molding into the female mold and perform injection. A molding die is constructed, a synthetic resin is injected and filled into the female mold from the male mold for injection molding, and a synthetic resin layer is integrally heat-sealed and coated on the back side of the molding sheet to form through holes or recesses. 1. A method for manufacturing a decorative body, the method comprising manufacturing a decorative body having an area.