A kind of integral forming method of U-shaped unit reinforced wall panel

Abstract

The present invention is an integral molding method of a U-shaped unit reinforced wall panel. This method lays up prepregs on the skin molding die 6 and the unit molding die 7, then assembles them together, and takes out the unit molding before curing. The mold 7 is only retained, and only the skin forming mold 6 is retained. This method can meet the requirements of the internal molding quality and verticality of the vertical ribs, and at the same time improve the uniformity of the mold temperature field, ensure the quality of the product, shorten the manufacturing cycle, and reduce the production cost. The U-shaped unit reinforced wall plate prepared by the method has a high degree of integration, good weight reduction effect and high safety, and provides an important key technology for the application of composite materials in large aircraft.

Description

technical field [0001] The invention relates to an integral forming method of a U-shaped unit reinforced wall plate, which belongs to the field of composite material wall plate forming. Background technique [0002] At present, composite materials are more and more widely used in aerospace structures, and the parts and quantities used in aircraft have become one of the important indicators to measure the advancement of aircraft structures. [0003] Traditional composite wall panel reinforcement forms include L-shaped reinforced panel, T-shaped reinforced panel, I-shaped reinforced panel, J-shaped reinforced panel, etc., such as figure 1 As shown, the web size of the vertical ribs of these panels is about 10-50mm. During the autoclave forming process, in order to ensure the quality of the assembled and formed panel, all the molds need to be assembled together and then put into the autoclave for forming. With the application of composite materials in aerospace structures more...

AI Technical Summary

Problems solved by technology

[0004] 1. There is a perfect fit between the vertical rib mold and the vertical rib mold, between the vertical rib mold and the skin mold, and there must be a fit gap, which will cause uneven pressure transmission and easily cause internal quality defects;

[0005] 2. Put too many molds in the vacuum bag, resulting in uneven heat transfer, slow and uncontrollable heating and cooling rate of the wall panel, resulting in internal quality defects, long time in the tank, and poor uniformity of the temperature field, resulting in failure Realize multiple molds into the tank;

[0006] 3. There are precision problems in mold reversal, fit and positioning, which increases the difficulty of mold processing and process operation, and is prone to defects and increases costs;

[0007] 4. During the curing process, due to the thermal expansion coefficient of the mold, the axial axis is offset

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