Molding method of tubular composite material part

Abstract

The invention relates to the field of machining and molding of materials, in particular to a molding method of a tubular composite material part. The method comprises the following steps: 1) mounting a special molding tool in a tubular rigid mould; 2) calculating the size of a core model; 3) sequentially wrapping a molding air bag, a nylon film and predregs on the core model; 4) removing the core model and putting into the tubular rigid mould; 5) placing fluid joints at the two ends of the air bag and tying the fluid joints by using high-temperature adhesive tapes; 6) introducing high-temperature gas or liquid into the air bag. According to the molding method of the tubular composite material part, internal stress caused by uneven heating of required products is avoided, the expansive and heavy rigid mould is abandoned, the labor conditions of workers are improved, the energy consumption is reduced to 90% or above, mould and energy source cost are saved, and the price competitive advantage of products is improved.

Description

[0001] (1) Technical field [0002] The invention relates to the field of material processing and molding, in particular to a method for molding tubular composite material parts. [0003] (2) Background technology [0004] In recent years, the concept of low-carbon environmental protection and physical fitness has become more and more popular, and green, environmentally friendly and healthy bicycle travel is deeply loved by the general public. Middle and high-end carbon fiber composite bicycles are becoming a fashion. However, most of the current carbon fiber bicycle frames are covered with carbon fiber-epoxy resin prepreg, heated and pressurized. During the molding process, the coated prepreg is put into a preheated special rigid mold, and then the mold is placed on the high-temperature molding furnace platform. After heating and pressurizing for a period of time, the mold is placed on the cooling platform to cool down. The product can be taken out. There are three problems...

AI Technical Summary

Problems solved by technology

There are three problems in this process: First, the upper and lower planes of the mold are in direct contact with the heating or cooling furnace to complete the heat transfer. There is a temperature difference inside the mold from the upper and lower planes to the middle, which causes the product to The problem of uneven temperature, which in turn causes uneven curing of epoxy resin-based composite materials, resulting in internal stress of the product

In industrial production, workers need to frequently open and close molds and move molds. The heavy rigid molds cause heavy physical loads for workers, increase the labor intensity of workers, and reduce production efficiency.

Rigid molds are costly to manufacture, maintain and use, and heavy molds have the potential to injure workers

Third, heating and curing light-weight carbon fiber composite materials requires very little heat, but the method of heating outside the mold must first heat the heavy rigid mold to the required temperature before the product can finally be heated to the required temperature. required temperature

To sum up, the current molding method has problems such as internal stress caused by uneven heating of the product, heavy mold workers, heavy labor, and insufficient release of factory production capacity, resulting in serious waste of manpower, physics, and energy.

These problems seriously restrict the reduction of the production cost of composite products represented by carbon fiber composite bicycles, making it difficult for consumers to bear relatively high purchase costs, which in turn affects the role of carbon fiber bicycles in energy conservation, environmental protection, green travel, and healthy travel.

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