A kind of airtight repair method of composite material component forming mold
A technology for composite material components and forming molds, which is applied in the field of airtight repair of composite material component forming molds, and can solve problems such as mold welding deformation, difficult air leakage positions, and mold air leakage
Active Publication Date: 2021-03-26
XIAN AIRCRAFT IND GROUP
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Problems solved by technology
During the manufacturing process of the mold, the mold leaks due to improper welding, cracks in the material itself, or casting sand holes.
It is easy to cause the mold to be scrapped
The air leakage point is generally repaired by repair welding to ensure the airtightness of the mold. The repair welding process can easily lead to mold welding deformation. At the same time, it is necessary to find the exact location of the air leak before welding, but it is very difficult to find the exact location of the air leak, especially some that are difficult to see with the naked eye. Identified leak location
[0003] In order to overcome the shortcomings of traditional repair welding airtight repair, it is necessary to develop an effective airtight repair method that is not easy to deform the mold and does not need to accurately find the leak point
Method used
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[0019] See attached figure 1 -3. A method for repairing airtightness of a molding die of a composite material component, comprising the following steps:
[0020] 1 Select a suitable low-melting point alloy 7 according to the molding temperature a of the composite material component, and the melting temperature of the selected low-melting point alloy 7 is higher than a+10°C and lower than a+30°C;
[0021] 2. After finding the air leakage area of the mold 1, draw the area marking line 2, degrease and derust the air leakage area, and install an air extraction device 4, a vacuum bag 5, and a sealing strip 6 on the back of the position;
[0022] 3 Heat treatment on the air leakage area, and the temperature of this position is controlled above the melting temperature of the low melting point alloy;
[0023] 4. Pour the melted low-melting point alloy liquid on the air leakage area, open the air extraction device 4, pump the low melting point alloy liquid into the air leakage point...
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The invention discloses an airtight repairing method for a composite material component forming mold. An appropriate low-melting-point alloy is selected according to the forming temperature of the composite material component, an area marking line is marked after an air leakage area of the mold is found, oil removal and rust removal treatment are carried out on the air leakage area, and an air suction device, a vacuum bag and a sealing rubber strip are installed on the back of the position; the molten low-melting-point alloy liquid is poured into the air leakage area, an air extracting deviceis turn on to draw the low-melting-point alloy liquid into an air leakage point, and the air extracting device is turn off after the low-melting-point alloy liquid leaks from the air leakage point; and the mold is cooled to solidify the low-melting-point alloy, the pressure condition of a pressure gauge is observed, and if the pressure does not change, repairing is judged to be completed.
Description
technical field [0001] The present application relates to the field of composite material molding dies, in particular to an airtight repair method for composite material component molding dies. Background technique [0002] Composite material autoclave molding components generally have complex curved surfaces, and their molding characteristics require that most of the molds have a thin-walled structure, and the molds are often made of thin plate materials for welding or casting. At the same time, during the molding process of composite components, the mold needs to have better air tightness under high temperature conditions. However, during the manufacturing process of the mold, due to improper welding, cracks in the material itself, or casting sand holes, the mold leaks. It is easy to cause the mold to be scrapped. The air leakage point is generally repaired by repair welding to ensure the airtightness of the mold. The repair welding process can easily lead to mold weldin...
Claims
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IPC IPC(8): B29C33/74B29C70/54
CPCB29C33/74B29C70/54
Inventor 吴志鹏洪晓明岳明周欣樊辉
Owner XIAN AIRCRAFT IND GROUP