JPS625842A - Manufacture of fiber reinforced resin molded product - Google Patents

Abstract

PURPOSE:To provide the molding process capable of further complicating the shape of a large molded product by a method in which after a continuous fiber bundle impregnated with resin has been wound like the meshes of a net arround a mandrel, the inner pressure of the mandrel is heightened, while constraining said bundle with a heated mold, whereby the impregnating resin is cured. CONSTITUTION:The bundles 2 of glass fibers are passed from bobbins 1 through an epoxy resin bath 3 and impregnated with resin, and it is wound on the hollow mandrel 4 made of easily deformable silicon rubber. Said material is constrained, applying a load W, with the mold 7 composed of a top force 7a and a bottom force 7b, and including a heating device therein. Then, the pressure in between the mold 7 and the hollow mandrel is heightened to 5-7kg/cm<2>, applying gas pressure F from a pipe 5. If the temperature of the mold 7 is raised to 100-150 deg.C, the fiber bundle 6 impregnated with resin is cured after 1-4hr. Then, the mold 7 is removed and the gas in the hollow mandrel 4 is sucked and exhausted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides fiber reinforcement by filament winding.
O! This article relates to a molding method for FRP 9# products.

[Prior art] Conventionally, the filament winding molding method has been limited to molding of simple shapes such as pipes and persimmons, and molding of complex shapes has been limited to SMC (5-sheet mold).
Molding is performed by the SMC method or the injection molding method, but integral molding is not possible with the SMC method, and it is difficult to manufacture large molded products using the injection molding method due to the molding equipment. Furthermore, since short fibers are used as reinforcing materials in the above method, the strength and rigidity of the molded product is significantly inferior to that of long fiber F-PK.

[Problems to be solved by the invention] Therefore, molded products with complex shapes can be obtained by using long fibers, which can be deployed in areas where strength and rigidity are required, lightweight structures, and the integration of multiple parts ( It is possible to expect benefits such as no need for bonding, corrosion resistance, and vibration characteristics due to inch-gradation.

The present invention is intended to solve the above-mentioned problems, and is intended to provide a method of molding a dog molded product by filament winding, which can make the shape of the molded product more complicated.

[Means for solving problems]

The method of molding an FRP product of the present invention involves filling a mandrel made of an easily deformable hollow body with a fluid, wrapping a continuous resin-impregnated fiber bundle around the mandrel in a mesh pattern, and then using a heated mold. The method is characterized in that the internal pressure of the mandrel is increased while being restrained to harden the impregnated resin.

[For production]

The hollow mandrel used in the present invention is a bag made of heat-resistant rubber or elastic glass sheets, and silicone rubber is particularly preferred from the viewpoint of heat resistance.

The continuous fiber bundle to be wound around the mandrel may be, for example, 2000 to 400 glass fibers each having a diameter of about 23 capes.
A roving made by aligning 0 carbon fibers or a single roving made by aligning 15,000 carbon fibers with a diameter of 7 μm are used.

The resins impregnated into these continuous fiber bundles include epoxy resin, unsaturated polyester resin, vinyl ester resin,
A phenol resin or the like is used, and a curing accelerator is added to such an extent that it does not harden until immediately after winding.

The winding of the continuous fiber bundle varies depending on the shape and size of the molded article, and also on whether the structure is a tight structure or a coarse structure. In addition, openings such as windows in the car body can be cut after forming, or the amount of wrapping at the relevant part can be reduced and after the wrapping is finished, it can be pushed out to create an opening according to the predetermined shape. Good too. Additionally, a joint nut or the like can be embedded in the joint.

After winding the fibers in any direction to achieve the desired strength and rigidity, they are restrained from the outside using a mold processed into a predetermined shape, and when the internal pressure of the mandrel is increased, the resin impregnation occurs. m-fiber bundles can be given a mold shape. The obtained molded product constitutes the body skeleton of the final molded product, and may be further covered with a resin layer in a later step, or a resin sheet or the like may be placed in the mold prior to molding, and resin-impregnated fibers may be used. It may be formed integrally with the bundle.

〔Example〕

Hereinafter, the present invention will be described in detail by taking an automobile body as an example and referring to the drawings.

The figure shows the process of molding a vehicle body frame. In step (2), the glass fiber bundle 2 from the bobbin 1 is passed through an epoxy resin bath 3 to be impregnated with resin, and then wound around a hollow mandrel 4 made of silicone rubber that is easily deformable. The surface area of the hollow mandrel 4 is equal to the surface area of the car body, and a gas such as air is filled in from the pipe 5, and the hollow mandrel 4 is pressurized to an internal pressure (cL5~1 kq/crtt) that can withstand filament winding, so that it has a shape that facilitates filament winding. It's citrusy. Furthermore, since the hollow mandrel 4 can be rotated in any direction by a support/rotation device (not shown), the resin-impregnated fiber bundle 6 can be wound in a direction that provides strength as a vehicle body frame.

In this way, the resin-impregnated fiber bundle 6 is transferred to the hollow mandrel 4.
The material is wrapped around it without any gaps to a thickness of about 3 t, and then in step (2), it is restrained by applying a load of W using a mold 7 consisting of an upper mold 7a and a lower mold 7b each having a built-in heating device. At this time, gas pressure F is applied from the pipe 5 to increase the pressure between the mold 7 and the hollow mandrel 4 to 5 to 7 kq/crd, and the temperature of the mold 7 is raised to 100 to 150°C. After 4 hours, the KVi resin-impregnated fiber bundle 6 is cured. At this time, a mold 7 is used to remove air remaining in the fiber bundle 6.
By discharging the air in the resin-impregnated fiber bundle 6 by installing a pressure reduction device on the side, the amount of fiber per unit volume increases and the strength of the molded body is improved.

Next, when W7 is removed and the gas inside the hollow mandrel 4 is removed by suction, the mandrel 4 contracts, so the window part can be cut and then taken out. can be obtained.

The tensile strength of a test piece obtained by cutting a part of the above vehicle body frame 8 was 100 jrq/rmn'' and the elastic modulus was 4000.
ky/trrm” and 8 using short glass fibers.
A significant improvement in strength was observed compared to the MC test piece, which had a tensile strength of 40 A9/rmn" and an elastic modulus of 1500 h/ran".

〔Effect of the invention〕

As explained above, the present invention has made it possible to integrally mold a large body that was conventionally obtained as a joined body of several parts.
The number of workers, etc. is drastically reduced, and manufacturing costs are lowered. Further, by reducing the number of joints, vibration characteristics are improved, and there is also a favorable effect in terms of noise prevention measures.

[Brief explanation of drawings]

The figures are explanatory diagrams of the steps of the example, where ■ indicates the fiber bundle winding process, ■ indicates the molding process, and ■ indicates the molded product. In the figure, 1... bobbin 2... glass fiber bundle 6.
...Epoxy resin bath 4...Hollow body mandrel 5...
・Vibe 6...Resin-impregnated fiber bundle 7...
Mold 7a...Upper plate 7b...Lower mold
8... Vehicle body frame patent applicant Toyota Motor Corporation Representative Patent attorney Yumi Sae (and 1 other person) ■ 4... Hollow body mandrel 6... Natsume Proceedings Amendment Form October 22, 1985 Director General of the Patent Office Insertion 1, Indication of the Case 1985 Patent Application No. 144309 2, Name of the Invention Method for Manufacturing Fiber Reinforced Resin Molded Articles 3, Person Who Amends the Case Relationship Patent applicant name (320) Toyota Motor Corporation 4. Agent address 6, Kanda-Surugadai, Chiyoda-ku, Tokyo (and 1 other person) 5. Date of amendment order September 4, 1985 (Shipping date: (August 24, 1985) 6. Subject of amendment (1) Brief description of drawings in the specification (2) Drawing 7, content of amendment (1) "Diagram" on page 7, line 10 of the specification is corrected as “Figure 1”. (2) Amend the drawing as shown in the attached sheet.

Claims (1)

[Claims] A mandrel consisting of a hollow body that is easily deformed is filled with fluid,
Fiber reinforcement characterized in that a continuous resin-impregnated fiber bundle is wound around the mandrel in a mesh pattern, and then the internal pressure of the mandrel is increased while being restrained in a heated mold to harden the impregnated resin. Method for manufacturing resin molded products.