Manufacturing die and forming method of large-length-diameter-ratio carbon fiber composite pipe

Abstract

The invention discloses a manufacturing die of a large-length-diameter-ratio carbon fiber composite pipe. The manufacturing die is composed of a lower die body, a middle die body and an upper die body. The lower die body is formed by connecting multiple lower die plate blocks, and the upper die body is formed by connecting multiple upper die plate blocks. Lower die grooves are formed in the two sides of the upper surface of each lower die plate block, the middle die body is composed of two middle die plate block units connected through a connector, each middle die plate block unit is formed byconnecting multiple middle die plate blocks, middle die convex blocks cooperating with the lower die grooves are arranged on the lower surfaces of the middle die plate blocks, middle die grooves areformed in the upper surfaces of the middle die plate blocks, and upper die convex blocks cooperating with the middle die grooves are formed in the two sides of the lower surfaces of the upper die plate blocks. The invention further discloses a forming method of the large-length-diameter-ratio carbon fiber composite pipe. According to the method, the carbon fiber composite material pipe with the length-diameter ratio larger than 60 is prepared through the combination of air bag pressurizing and the die pressing process. By means of the die, the length-diameter ratio of the pipe is increased, and the forming efficiency is improved. By means of the method, the dimensional precision and the surface quality of the pipe are improved.

Description

technical field [0001] The invention belongs to the technical field of forming carbon fiber composite material products, and in particular relates to a production mold and a forming method of a carbon fiber composite material pipe with a large length-to-diameter ratio. Background technique [0002] Due to its unique advantages such as small specific gravity, high specific strength and specific modulus, good high temperature resistance, fatigue resistance and wear resistance, carbon fiber composite materials are widely used in the field of general aviation design and manufacturing to replace aluminum alloys, Titanium alloy, alloy steel and other materials. Traditional carbon fiber composite material tubes are mostly formed by hand lay-up and RTM methods, but the strength of the products produced by these two forming methods is poor, the amount of glue is not easy to control, and it is difficult to maintain the consistency of product quality when preparing large-sized parts e...

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Problems solved by technology

Traditional carbon fiber composite material tubes are mostly formed by hand lay-up and RTM methods, but the strength of the products produced by these two forming methods is poor, the amount of glue is not easy to control, and it is difficult to maintain the consistency of product quality when preparing large-sized parts ensure

At present, the commonly used winding method is to design the winding angle according to the stress of the product to give full play to the strength of the fiber, with high efficiency and good reliability. However, for the winding of the tube, there is too much tension at the edges and corners, and the fiber slips easily when winding at a small angle. Uneven yarn winding and other problems, and the surface of the wound product needs to be processed twice. It is generally suitable for the preparation of pipes with a single-sided carbon fiber composite material with a wall thickness of 2mm or more.

Cao Xiaoming from Beihang University used the silicon rubber thermal expansion molding process to prepare carbon fiber composite tubes. When the size of the tube is small, no external pressure source is needed, and the pressure is evenly transmitted on the inner wall of the composite material through the thermal expansion of the silicone mandrel. However, for products with large aspect ratios , the body of the silicone core film is soft and difficult to enter the mold, and it is also difficult to ensure that the pressure is applied evenly during the expansion process. At the same time, the expansion performance of the silicone core film has also changed after several uses, and it is difficult to guarantee the process of each batch of products. consistent

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