Preparation method of tool capable of adjusting composite material female die forming pressure

Abstract

The invention relates to a preparation method of a tool capable of adjusting composite material female die forming pressure, and belongs to an auxiliary transition tool for manufacturing a composite material. The structure form of the tool is as follows: the outermost layer adopts expanding rubber, and the middle is filled with a filler taking SiO2 as a substrate. The preparation method of the tool comprises steps as follows: five layers of glass cloth are paved on a male die through EW210 / J-4 and cured at the normal temperature for 20-28 hours, and then, a glass cloth part is taken out; a 0.3-0.7 mm long aluminum plate is glued on the periphery of the inner surface of the glass cloth part taken out from the step 1); expanding rubber is prepared according to the weight ratio of Aircast 3700 expanding rubber Part A to Aircast 3700 expanding rubber Part B of 100:12; a part of the well prepared Aircast 3700 expanding rubber is firstly poured into a part cavity, then, the filler taking SiO2 as the substrate is poured in a root area, and finally, the expanding rubber is poured till the expanding rubber is flush with the edge of the glass cloth part; and after the mixture is cured at the normal temperature for 20-28 hours, an expanding rubber solid is taken out and is the tool.

Description

technical field [0001] The invention relates to a preparation method of an adjustable composite material negative mold forming pressure tool, which belongs to the auxiliary transition tool for composite material manufacturing. Background technique [0002] The shape of glass fiber composite parts is extremely irregular (part structure such as figure 1 ), the opening size of the root and tip of the part is different. In order to ensure that the shape meets the requirements, it is necessary to use female mold molding. When the part is cured, the expansion rubber is placed in the prepreg part, and the expansion force of the expansion rubber after heating and the combination of external pressure The pressure method exerts pressure on the parts, but after the parts are formed, the parts are not compacted and the thickness of the parts is uneven. For parts of this type of structure, the pressure in the expansion rubber needs to be adjusted to apply pressure to the parts. For this ...

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Problems solved by technology

[0002] The shape of glass fiber composite parts is extremely irregular (part structure such as figure 1 ), the opening size of the root and tip of the part is different. In order to ensure that the shape meets the requirements, it is necessary to use a female mold. When the part is cured, the expansion rubber is placed in the prepreg part, and the expansion force of the expansion rubber after heating and the combination of external pressure The pressure method applies pressure to the parts, but after the parts are formed, the parts are not compacted and the thickness of the parts is uneven. For parts of this type of structure, the pressure in the expansion rubber needs to be adjusted to press the parts. For this shape structure For complex parts with high shape requirements, SiO is added to the expanded rubber 2 For the method of filling the matrix, there is no specific information in the industry at home and abroad, and there is no relevant technical information that can be used for reference.

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