JPH0480022A - Manufacture of automotive wheel - Google Patents

Abstract

PURPOSE:To obtain simply an automotive wheel without coating with a release agent and wiping it and degreasing and cleaning of a decorative body made of a foamed resin by a method wherein a resin film is placed on a bottom force having a decorative face; a top force is closed and a foamable resin raw material is fed on the upper face of the resin film; molding of the decorative body made of a foamed resin and adhesion of the surface with the resin film are simultaneously performed. CONSTITUTION:A resin film 2 is placed on a bottom force 1 with a required decorative face 1a and a top force is placed thereon and a mold apparatus are closed. Then, when a foamable resin raw material is cast on the upper face of the resin film from an inlet 4a of the top force 4, the resin film 2 is brought into tight contact with the decorative face 1a of the bottom force 1 by a foaming pressure of the foaming resin and at the same time, a decorative body A made of the foamed resin is molded and the resin film adheres to the surface of the decorative body A. The thus obtd. decorative body A is bonded on a base wheel with an adhesive to form a required automotive wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing an automobile wheel formed by fixing a decorative member made of foamed resin.

(Prior Art) Conventionally, as methods for manufacturing automobile wheels formed by fixing this type of foamed resin decorative body, there have been two methods: molding the foamed resin decorative body and simultaneously fixing it to the base wheel; After manufacturing the base wheel in different processes,
There is a method of fixing these with adhesive.

The former is a lower mold 00 with a decorative surface, as shown in FIG.
) and then fix the base wheel OD to the lower mold using a wheel presser 021 from above to prepare the molding device side. Next, the foamed resin raw material is poured into the lower mold 0■ and the base wheel (1
1) is injected into the cavity surface formed by step 1) and foamed to form a foamed resin decoration and at the same time adhere to the base wheel to manufacture an automobile wheel.

In addition, Gω in the figure is the flange presser, a7' is the core presser, (
+81 is the bolt hole guide, and 09) is the center.

In the latter case, as shown in the seventh picture, an upper mold (sha) with a surface shape similar to that of the Heas wheel is placed on a lower mold (D) with a decorative surface, and a mold device (sha) Prepare.

Next, the foamed resin raw material is injected into the cavity 2414 from the injection port of the molding device and molded. The molded foamed resin decorative body becomes an automobile wheel through a step (not shown) in which it is fixed with an adhesive to a Heath wheel molded in a separate step.

Note that - in the figure indicates an air vent hole.

(Problems to be Solved by the Invention) In any of the above conventional methods, since the foamed resin raw material is directly injected into the cavity formed by the lower mold and the upper mold or the wheel, the foamed resin decoration When molding the body, it was necessary to apply a mold release agent to the lower mold having a decorative surface each time the mold was molded, and it was also necessary to wipe off the mold release agent that had been specially applied during the previous molding.

In addition, the foamed resin decorative body needs to be painted after molding, but since the mold release agent applied to the lower mold also adheres to the foamed resin decorative body, painting cannot be done on the surface as it is. There were many issues that needed to be resolved before the palace decorations, including the need for degreasing and cleaning.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to eliminate the need for a mold release agent application and wiping process for the lower mold and a degreasing and cleaning process for the foamed resin decorative body. To provide a method for manufacturing an automobile wheel that can be easily manufactured without any problems.

(Means for Solving the Problems) In order to achieve the above object, in the method for manufacturing an automobile wheel of the present invention, a resin film is placed on a lower mold having a decorative surface, and the resin film is applied as necessary. A first step of fixing, a second step of closing the mold device consisting of a lower mold and an upper mold or a Heath wheel, and injecting the foamed resin raw material into the mold device so that the foamed resin raw material flows into the upper surface of the resin film. It consists of a third step and a fourth step of forming a foamed resin decorative body and simultaneously adhering a resin film to its surface by foaming the foamed resin.

In addition, as a pre- or post-process of the second step, the air between the resin film and the lower mold is discharged from the vacuum degassing hole provided in the lower mold, and the resin film is aligned with the decorative surface of the lower mold. Sometimes a process of making the pieces come into close contact is added.

Furthermore, after the first step of spreading the resin film on the lower mold and fixing it as necessary in the above process, a step of painting the resin film may be added.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIGS. 1(A) to 1(C) are explanatory diagrams showing the steps of the first embodiment of the present invention, in which a lower mold (1) having a required decorative surface (1a) is shown.
), and if necessary, fix the resin film with the clamp [3] ((0) in the same figure), then place the upper mold (4) and close the mold device (in the same figure ([ 1) ).

Next, when the foamed resin raw material is injected onto the upper surface of the resin film from the injection port (4a) of the upper mold (4), the resin film (2)
The decorative surface (la) of the lower mold (1) is formed by the foaming pressure of the foamed resin.
At the same time as the foamed resin decorative body (A) is molded, the resin film (2) is adhered to the surface of the decorative body (A) ((c) in the same figure). , (4b) in the figure is an air vent hole.

The decorative body (A) obtained by the above method is fixed to the Heas wheel (8) with an adhesive to form a desired automobile wheel (-) (FIG. 2).

By the way, FIG. 3 shows a different example, in which a resin film (
By adding a step of painting (5) onto the two discharged surfaces, a foamed resin decorative body (A) having a resin film (2) adhered to the surface via the paint (T) was obtained. This foamed resin decoration (A) was used to form a desired automobile wheel (-) in the same manner as described above (FIG. 4).

Next, FIGS. 5(a) to 5(d) are explanatory diagrams showing the steps of the second embodiment of the present invention, in which a resin film (2) is placed on a lower mold (6) having a desired decorative surface (6a). , and fix the resin film with the clamp (3) if necessary ((a) in the same figure).
After that, the upper mold (4) is placed ((U) in the same figure), and then the resin film (2) is inserted through the vacuum degassing hole (6b) provided in the lower mold.
By discharging the air in the cavity (7) formed by the lower mold (1) and the lower mold (1), the resin film (2) is brought into close contact with the lower mold (IL5) having the decorative surface (6a). )) Next, when the foamed resin raw material is injected from the injection port (4a) of the upper mold (4), the foamed resin decorative body (A) is molded and at the same time the surface of the foamed resin decorative body (A) is injected. resin film (2)
is glued (see figure (d)).

In addition, although some of the steps in the above example are repeated, a resin film is spread and fixed on a lower mold having a decorative surface,
There may be a step (not shown) in which the air in the space closed by the resin film and the lower mold is exhausted from the vacuum degassing hole, and then the upper mold is closed and the mold apparatus is prepared.

In this embodiment as well, as in the different embodiments of the first embodiment, a step of painting the upper surface of the resin film may be added after the step of FIG. 5(a).

By the way, in each of the above-mentioned embodiments, by using a Heath wheel instead of the upper mold and using a known molding device as shown in FIG. It is of course also possible to produce motor vehicle wheels fixed to Heas wheels.

(Effects of the Invention) When the method for manufacturing an automobile wheel according to the present invention is used, a mold release agent that has conventionally been required to be used when molding a foamed resin decorative body is no longer required, and a mold release agent Since this process does not require the use of degreasing and cleaning processes that are necessary when painting foamed resin decorations, it has excellent effects such as significantly shortening the manufacturing process and allowing for more decoration.

[Brief explanation of drawings]

(a) is a sectional view, (b) is a front view, FIGS. 3 and 4 show different embodiments, and FIG.
The figure is a schematic sectional view explaining the painting process, FIG. 4 is a partial sectional view of an automobile wheel, and FIGS. 5 (a) to (d) are schematic sectional views explaining the process of the second embodiment of the present invention. FIGS. 6 and 7 are schematic cross-sectional views each illustrating a conventional manufacturing method. <IL (6)--Lower mold, (la), (6a
)--Decorative surface, (6b)...Vacuum deaeration hole, (2
)... Resin film, (3)... Clamp, (4)... Upper mold, (4a)...
Inlet, (4b)... Air hair hole, (5).
... Painting, (7) ... Blank space, (A) ...
... Foamed resin decoration, (B) ... Heath wheel, (T) ... Paint, (-) ...
...Car wheels. Patent applicant Hiroshi Kanai − No. /α / Fig. Fig. Fig. Fig.

Claims (3)

[Claims] (1) A method for manufacturing an automobile wheel comprising a foamed resin decoration adhered to the surface, which comprises the following steps: (B) The first step of placing the resin film on the lower mold having a decorative surface. (B) The second step of closing the mold device consisting of the lower mold and the upper mold or base wheel. (C) The resin film flows onto the upper surface. (d) A fourth step of bonding a resin film to the surface of the decorative object at the same time as molding the foamed resin decorative object. (2) The automobile wheel according to claim 1, further comprising a step of discharging air between the resin film and the lower mold and bringing the resin film into close contact with the decorative surface of the lower mold before or after the step (opening). manufacturing method. (3) The method for manufacturing an automobile wheel according to claim 1 or 2, wherein a step of painting the resin film is added after the step (a).