JPH0353097B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to fiber-reinforced resin molded products (hereinafter referred to as FRP).
This relates to the manufacturing method of molded products.

[Prior Art and its Problems] It is known that FRP molded products are advantageous products that can be molded at once by incorporating various accessory parts at the same time, reducing the number of manufacturing steps. However, when the shape becomes complex, it cannot be molded all at once.
For example, FRP processing often requires inefficient manual work.
For press-formed products, a protector part is sometimes attached to the outer periphery of the molded product. For example, for parts used as automobile exterior panels, soft PVC is bonded to the outer periphery in a post-process to prevent interference with the body and damage, and for parts used as automobile interior materials, soft PVC is bonded to the outer periphery of the parts to prevent interference with the body and damage. A protector is installed to remove gaps between the edges and protect the outer periphery, but this installation process is still a manual post-processing process.
An efficient method is desired.

[Means for Solving the Problems] The present invention has been made in response to the above-mentioned demands, and includes a molding material containing an uncured resin and reinforcing fibers placed in a press mold having a slide core. , close the mold and semi-cure or harden the molding material to form a main molded body, then open the slide core part to form a closed space between the mold and the main molded body, and then Fiber-reinforced resin molding characterized by injecting a resin and/or rubber composition into a space to obtain a molded product in which a part of the main molded body is integrated with the injected resin and/or rubber composition. It concerns the manufacturing method of the product.

A typical operating procedure of the present invention will be explained with reference to the attached FIGS. 1-3. The molding material (Fig. 1, 4) containing uncured resin and reinforcing fibers is placed on the lower mold (Fig. 1, 2) having a slide core (Fig. 1, 3), and the upper mold (Fig. 2, 1) is closed. Then, the material is heated under pressure to semi-cure or harden the material to form a main molded body (FIG. 2, 7). With the upper and lower molds closed, the slide core (Fig. 3) is slid to form a closed space between the main molded body and the lower mold (Fig. 3, 2) and the slide core. After the resin and/or rubber composition (Fig. 3, 6) is injected into this space from the injection nozzle (Fig. 3, 5), and the main molded body and the injected resin and/or rubber composition are integrated. , open the mold and take out the molded product.

Although the accompanying drawings show an example in which the undercut portion is provided by injection injection, the present invention can be applied to various molded products by changing the shape and position of the slide core. For example, it can be applied to providing a protector part on the outer peripheral surface or inner peripheral surface of a molded product, or providing ribs or bosses on the surface. The resin and/or rubber composition to be injected is mainly composed of a thermosetting or thermoplastic resin or rubber, and may contain reinforcing fibers. The material forming the main molded body is a resin mixed with reinforcing fibers to increase strength and rigidity. The resin may be a thermosetting resin or a thermoplastic resin. The reinforcing fibers can be in various shapes such as a cross shape, a pine shape, or a chopped string shape.

The press molding process for forming the main molded body may be carried out by a normal press molding method, such as preform press molding, matte press molding, cross press molding, prepreg cross press molding, SMC or
BMC press molding or stamping molding can be used. In addition, a method applying press molding such as resin-in-die molding may also be used. The main molded body does not need to be completely cured, and may be in a semi-hardened state that does not deform when the slide core in contact with the main molded body is slid. A semi-cured state is preferable because it has higher adhesion to the injection injection resin. The slide core is preferably provided in the lower mold of the press mold, but may be provided in the upper mold or both the upper mold and the lower mold. A resin and/or rubber composition is injected into the space formed by the slide core through an introduction path formed in the slide core or the press mold. The injected resin and/or rubber composition may be cured as it is, or may be cured while being compressed with a slide core.

In addition to reinforcing fibers, the main molded body and the resin composition for injection injection may contain various fillers, curing agents, mold release agents, thickeners, retardant agents, and the like. In addition, usable resins include polyamide resin, polyamide resin, polycarbonate resin, polysulfone resin, polyacetal resin, polyphenylene oxide resin, polypropylene resin, polyethylene resin, polyvinyl chloride resin, cellulose resin, acrylic resin, and methacrylic resin. , styrene resin,
Thermoplastic resins such as thermoplastic polyurethane resins and fluororesins, phenolic resins, unsaturated polyester resins, furan resins, alkyd resins, allyl resins, melamine resins, silicone resins, thermosetting polyurethane resins, vinyl ester resins, urea resins, etc. It is a thermosetting resin. Rubbers include natural rubber, styrene butadiene rubber, butadiene rubber, acrylonitrile butadiene rubber, nitrile rubber, chloroprene rubber, acrylic rubber, ethylene propylene rubber, polyisoprene rubber, butyl rubber, epichlorohydrin rubber, polyurethane rubber, fluorocarbon rubber, silicone rubber, etc. may be used alone or in a blend thereof. In addition to glass fiber, reinforcing fibers include carbon fiber, boron fiber, fused silica fiber, silica fiber, alumina fiber, zirconia fiber, boron nitride fiber,
Inorganic fibers such as silicon nitride fibers, boron carbide fibers, silicon carbide fibers, asbestos fibers, and metal fibers, or natural or synthetic fibers such as hemp, vinylon, polyamide, and polyester may be used.

[Example] An FRP molded product having an undercut portion was molded according to the operating procedure shown in FIGS. 1 to 3.

SMC containing glass chopped strand mat, unsaturated polyester resin, thickener, etc. as the molding material for the main molded body is heated at 130 to 150℃ for 1 to 2 minutes.
After press molding at a pressure of 50 to 150 Kg/cm ² , open the slide core and inject BMC containing glass chopped strands and unsaturated polyester resin as an injection injection composition, and after 0.5 to 1 minute, When the mold was opened and the molded product was taken out, a product in which the undercut portion was firmly bonded was obtained.

[Effects of the Invention] According to the method of the present invention, attachment members can be incorporated into a press-formed body in a press-forming mold, so that productivity is improved. Further, even if the shape of the press-formed body and the shape of the attached member are complicated, there is an advantage that the two can be easily integrated.

[Brief explanation of drawings]

1 to 3 are cross-sectional views of a press mold having a slide core. 1... Upper mold, 2... Lower mold, 3... Slide core, 4... Molding material for main molded body, 6... Resin and/or rubber composition for injection injection.

Claims (1)

[Claims] 1. A molding material containing an uncured resin and reinforcing fibers is placed in a press molding mold having a slide core, the molding mold is closed, the molding material is semi-cured or hardened to form a main molded body, and then a slide The core part is opened to form a closed space with the mold and the main molded body, and then a resin and/or rubber composition is injected into the space, so that a part of the main molded body is covered with the injected resin. and/or a method for producing a fiber-reinforced resin molded product, characterized by obtaining a molded product integrated with a rubber composition.