JPH02198840A - Automotive outer plate panel and molding thereof - Google Patents

Abstract

PURPOSE:To obtain a beautiful coated surface without performing a special surface treatment and to reduce plant cost by adhering and laminating a base consisting of the first resin material prepd. by mixing a reinforcing material such as a glass fiber in a matrix consisting of a thermoplastic resin with the second thermoplastic resin material contg. no reinforcing material. CONSTITUTION:The first resin material 3 prepd. by mixing a glass fiber as a reinforcing material in a matrix heated and softened consisting of a thermoplastic resin such as polypropylene is fed in a bottom force 2 from an injection cylinder 4. A top force 1 is applied thereon and the first resin material 3 is filled in a molding space between both forces 1 and 2 to form a molding raw material 5. When the mold is opened, the molding raw material 5 remains on the bottom force 2 as it adheres thereon. The second thermoplastic resin material 6 with excellent heat resistance and a m.p. of 180 deg.C or higher such as polypropylene is fed thereon and the top force 1 is applied thereon. The second resin material 6 is thereby laminated on the molding raw material 5 and an integratedly molded item 7 is obtd. in the bottom force 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the molding of automobile exterior panels from resin.

[Conventional technology]

Car roofs, sunshades, air spoilers.

Traditionally, steel plates were used for exterior panels such as side mudguards, but recently steel plates have become more resistant to rust.
FRP is increasingly being used.

In consideration of rigidity, FRP is made of a material in which glass fibers are mixed into a thermosetting resin matrix, and is molded by the SMC method or the BMC method.

[Problem to be solved by the invention]

However, this FRP product often has pinholes or fibers that stand out on the surface due to air bubbles contained in the gaps between the glass fibers, so it is necessary to correct this with putty or polish the surface before painting. This has the disadvantage of increasing manufacturing costs.

Furthermore, it is necessary to heat the mold to harden the resin during molding, which has the disadvantage of increasing equipment costs for the molding machine.

The present invention aims to solve these problems of FRP molding technology and provide an FRP molding method that allows a beautiful painted surface to be obtained without special surface finishing, and that does not increase equipment costs. purpose.

[Means to solve the problem]

The purpose of this is to heat the first resin material, which is a matrix made of thermoplastic resin mixed with reinforcing materials such as glass fiber, to an appropriate temperature to soften it, and then form it between the upper and lower molds. to obtain the desired molding material.
After opening the upper and lower molds, a second molding material in a softened state that does not contain fiber reinforcement is placed on the molding material set in one mold.
0 thermoplastic resin and applying the other mold to it again to obtain a molded product in which a second resin material is laminated on the first resin material. This is achieved by a molding method and an automobile exterior panel obtained thereby.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 shows an upper mold 1 and a lower mold 2 of a flow stamping molding machine used in the present invention.

First, a first resin material 3 in which glass fibers are mixed as a reinforcing material into a matrix of thermoplastic resin such as polypropylene that is heated and softened is transferred from an injection tube 4 to a lower mold 2.
supplied within.

Next, as shown in FIG. 2, the upper mold 1 is applied to this,
The molding space between the molds 1 and 2 is filled with the first resin material 3, and the molding material 5 is molded.

As shown in FIG. 3, when the mold is opened, the molding material 5 remains attached to the lower mold 2.

As shown in FIG. 4, a second thermoplastic resin material 6 such as polypropylene with excellent heat resistance and a melting point of 180°C or higher is supplied, and the upper mold I is applied as described above to form a molded material. A second resin material 6 is laminated on top of the second resin material 5 to obtain an integrated molded product 7 in the lower mold 2.

At this point, an ejector pin (not shown) is operated to remove the molded product 7 shown in FIG. 5 from the lower mold 2.

In addition to the above-mentioned examples, the following combinations of the first resin material and the second resin material can also be mentioned.

1) Glass fiber mixed nylon resin + nylon resin 2) Glass fiber mixed polycarbonate resin + polycarbonate resin 3) Glass fiber mixed polybutylene terephthalate resin +
Polybutylene terephthalate resin [Effects of the invention] This molded product 7 has a surface of FRP with excellent rigidity made of a first resin material containing glass fiber as a reinforcing material, and a second resin with excellent heat resistance that does not contain a reinforcing material. Since it is constructed by laminating materials, surface defects such as pinholes and raised fibers, which are typical of FRP, are completely covered with the second resin layer. Therefore, even if it is directly painted, a beautiful finish can be obtained without any problems. Furthermore, since thermoplastic resin is used, there is no need to heat the mold to harden the resin during molding, making the construction of the molding machine simple and inexpensive.

[Brief explanation of the drawing]

1 to 5 are schematic side views showing the molding procedure according to the present invention. 1... Upper mold, 2... Lower mold, 3... First resin material, 4... Injection tube, 5... Molding material, 6... Second resin material, 7... Molding.

Claims (1)

[Claims] 1. A base material made of a first resin material in which a reinforcing material such as glass fiber is mixed into a matrix made of a thermoplastic resin,
An automobile outer panel in which a second thermoplastic resin material containing no reinforcing material is closely laminated. 2. The first resin material, in which a reinforcing material such as glass fiber is mixed into a matrix made of thermoplastic resin, is heated to an appropriate temperature to soften it, and this is formed between the upper mold and the lower mold. A desired molding material is obtained by supplying it to a molding space, and after opening the upper and lower molds, a second thermoplastic resin in a softened state that does not contain a reinforcing material is supplied onto the molding material set in one mold. A method for molding an outer panel for an automobile, comprising: applying the other mold to the mold again to obtain a molded product in which a second resin material is laminated on the first resin material.