JPH01208122A - Manufacture of square pipe made of fiber-reinforced plastic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a rectangular vibrator made of 11-fiber reinforced plastics as a structural member, for example.

Conventional technology In the past, a mold for a prismatic pipe was rotated around the central axis of the mold, and tension was applied to the tape-shaped long fibers impregnated with resin on the surface of the mold to create a predetermined thickness. It was manufactured by wrapping the material around the edges and then heating and curing it without any shaping work.

Problems to be Solved by the Invention According to the above-mentioned conventional method, the tape-shaped long fibers wound around the mold of the prismatic pipe are twisted in the thickness direction of the mold (the sides) at the corners of the mold. However, in the flat part of the mold, the compressive force in the thickness direction is not so effective, so there is too much resin in the flat part, causing it to swell, increasing the thickness of the product. Therefore, as the number of windings increases, the cross section of the product becomes closer to a circle, making it impossible to manufacture a specified square pipe.

In addition, in the plane part where there is too much resin, the resin cannot be squeezed out, so the fiber content becomes small, and there are problems in that a vibrator with high strength cannot be manufactured as a product.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides prepreg S#f reinforced plastics (reinforcing fibers impregnated with uncured resin) in a mold for a prismatic pipe in a predetermined manner. After wrapping it to the desired thickness and then wrapping a release film over it,
A mold material with a flat surface is applied to the entire surface of the prismatic flat part, and the bulge in the flat part due to excess resin is removed by placing the prismatic material in an inner pack and heat-curing it under vacuum.

Effect: According to the above method, the reinforced a-fiber plastic of the prepreg, which forms the flat part of the prismatic pipe in the flat part of the flat-faced shape material, is evenly pressurized from the surrounding area by atmospheric pressure, so that the bulge due to excess resin in the flat part is prevented. The thickness of the prepreg-reinforced 11 miscellaneous plastics wrapped around the mold becomes uniform, and the strength becomes even.

As shown in the example drawings, 1 m of prepreg is placed around the mold 1 of the prismatic pipe. ! The reinforced plastics 2 is wound to a predetermined thickness to form a desired shape, the release film 3 is wrapped over it, and then the flat part 5 of the mold material 4, which is flat on one side, is reinforced with prepreg 11. Press the mold 1 of the prismatic pipe onto the flat part 6 of the miscellaneous plastics 2 so as to squeeze it tightly.
After the mold materials 4 are temporarily fixed together with tape, they are sealed in a vacuum pack 7 and the air inside is removed by a vacuum pump 8. When the air is removed from the surroundings, the mold material 4, which is flat on one side, is directed toward the mold 1, which is a prismatic pipe. Apply pressure. After heating in a heating furnace in this state to harden the prepreg reinforced fiber plastic 2, take out the vacuum pack 7, release the vacuum, and take out the product. A fiber-reinforced plastic pipe is obtained.

Effects of the Invention According to the method of the present invention as described above, a) - the flat part of the flat-faced mold material is applied to the entire surface of the prismatic flat part of the prepreg fiber-reinforced plastic and sealed in a vacuum pack; In order to create a vacuum, the mold material is pressurized evenly in the direction of the mold, and a constant and uniform compressive force is applied to the flat part of the prepreg 4I fiber-reinforced plastic in the thickness direction, ensuring a constant thickness and high precision. A tall prism can be obtained.

b) When wrapping prepreg fiber plastics around a mold for a rectangular vibrator, the work can be done on a plate like making a glue roll, so the mold only needs to have low bending rigidity, and the mold type can be inexpensive, making it easier to manufacture The cost will also be lower.

(1) Since the rigidity of the mold for prismatic pipes is not required, it is possible to manufacture elongated prismatic pipes.

There are many effects such as

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a perspective view showing the manufacturing process. 1... Mold for prismatic pipe, 2... Prepreg fiber reinforced plastic, 3... Release film, 4...
- Shape material with a flat surface, 5... Flat part, 6... Plane part, 7... Vacuum pack, 8... Vacuum pump. Agent Yoshihiro MorimotoFigure 1

Claims (1)

[Claims] 1. Wrap prepreg fiber-reinforced plastic to a specified thickness around a prismatic pipe mold, then wrap a release film over it, and then apply a shape material with one flat surface to the entire surface of the prismatic plane part. A method for producing a rectangular pipe made of fiber-reinforced plastics, which comprises placing the rectangular column in a vacuum pack and heat-curing it in a vacuum state.