Molding method of carbon fiber material of bicycle

Abstract

Provided is a molding method of a carbon fiber material of a bicycle. The method includes the steps of providing a temperature that can heat polyvinyl alcohol to be above the melting point of the polyvinyl alcohol, manufacturing a molded core after molding and cooling, making carbon fiber prepreg cloth wrap the whole outer surface of the molded core to form a pre-molded body, heating and pressing the pre-molded body so that the carbon fiber prepreg cloth is hardened and molded, molding the pre-molded body to be a carbon fiber molded body, and immersing the carbon fiber molded body into water and dissolving the molded core therein. The polyvinyl alcohol subjected to heat treatment is selected to serve as a core, can bear heating and pressing during a molding process of carbon fiber, and is not liable to soften or noticeably changes in terms of dimension, so the carbon fiber prepreg cloth can be stably supported. Moreover, the core can be dissolved by water after molding and is separated from the molded body. The manufacturing time is effectively saved.

Description

technical field [0001] The invention relates to a molding method of a carbon fiber material, in particular to a molding method of a carbon fiber material suitable for making bicycle components and using a supporting core material for molding. Background technique [0002] Due to its light weight, hard texture and corrosion resistance, carbon fiber is widely used in the manufacture of bracket products that require high strength and high durability, such as bicycle frames, aerospace machinery parts, badminton rackets, fishing rods, golf heads Or golf clubs, baseball bats, model airplanes, model toys, electronic product casings, hockey sticks, ski poles and car frames and other products. [0003] Among them, if the carbon fiber material is to be formed into a tubular bracket product, a supporting core material must be provided during the molding process for the carbon fiber prepreg to be laminated. After molding, the supporting core material is taken out to obtain carbon fiber...

AI Technical Summary

Problems solved by technology

However, when the supporting core material 13 in the molded body 14 is to be taken out after the molding is completed, the molded body 14 is not necessarily a straight single-caliber type, and is often provided with a branch structure according to the set requirements. (for example, T-shaped tube) or formed into a bent tube type, resulting in the PU foam support core material 13 cannot be taken out completely, must be broken into multiple fragments by cutting, chipping or other means, and then the fragments Take out one by one, therefore, to obtain the molded body 14 finished product that has completely removed this support core material 13 needs to spend more process time

[0006] The supporting core material formed by foaming polystyrene can also avoid the problem of wrinkling on the inner wall surface of the molded body 14 by using the air bag 11, but the supporting core material formed after the foaming of polystyrene (not shown) the surface is easy to be uneven, resulting in the uneven inner wall surface of the formed carbon fiber product, which will also cause stress concentration and affect the structural strength of the carbon fiber product. In addition, the use of expanded polystyrene The molded supporting core material is easy to bond with the inner wall of the molded carbon fiber product, and it is not easy to be taken out completely. Therefore, more process time must be spent in the production and processing

[0007] In addition, whether it is the method of nylon air bag assisted inflatable molding, or the method of using PU foam material or foamed polystyrene as the support core material 13 to cooperate with the air bag molding method, due to the type of air bag and the PU foam material Due to the material characteristics of expanded polystyrene, it cannot maintain a completely unchanged shape like rigid materials. It can only use a rough shape structure close to the final product as a support structure for carbon fiber prepreg to cover, and During the press molding process, pressure is applied from the inside to make the carbon fiber prepreg tightly adhere to the inside of the molding mold, so as to conform to the shape of the molding mold to form the final product

Therefore, when the support core material 13 of the air bag, the PU foam material, or the support core material of the expanded polystyrene sticks the carbon fiber prepreg cloth, it is impossible to grasp the precise shape of the final product, but, in order to avoid the final Some parts of the product (for example, corners or branch structures) may cause thinning or even holes in some parts of the product. When laminating, it is often necessary to increase the area of ​​overlapping parts between carbon fiber prepregs and increase the overlap. The number of layers, but need to use more carbon fiber prepreg, resulting in increased material costs

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