Abstract
The discrete clamp is used to replace the integral clamp in the traditional stretch forming process, and the stretch forming process of complex curved parts is studied. With the trapezoidal profile part and the double curved top part as the research objects, numerical simulation of the stretch forming process with the integral clamp and the discrete clamp is carried out respectively. The numerical simulation results show that: compared with the integral clamp, it is easier for the trapezoidal profile part to fit the die during stretch forming with the discrete clamp, and the distribution of strain and thickness of the formed part is more uniform; during forming of the double curved top part, with the same forming force, the sheet metal can not fit the die completely with the integral clamp forming, while it can completely fit the die during stretch forming with the discrete clamp. When the forming force of the integral clamp is increased, the sheet metal still can not fit the die completely, and the sheet metal is more likely to crack. Stretch forming tests are conducted for the trapezoidal profile part and the double curved top part with the discrete clamp stretch forming device, and good forming effect is realized, which is consistent with the numerical simulation results.
Highlights
The skin part, as the main part of aerodynamic configuration of the aircraft, is characterized by small quantities, large varieties and large size
When the discrete clamp is used, the movement of each sub-clamp is independent, and corresponding displacement can be produced with the change of the curvature of the die edge, which avoids the synchronous stretching of all parts of the sheet metal, reduces the resistance of clamp movement, so that the sheet metal is more evenly stressed and it is easier for the sheet metal to fit the die
The research results of the trapezoidal profile part show that: the discrete clamp can be distributed with the curvature change of the die edge, so that the integral displacement of the traditional clamp is avoided, it is easier for the sheet metal to fit the die, the strain and thickness of the part are more uniform, and the forming effect is better
Summary
The skin part, as the main part of aerodynamic configuration of the aircraft, is characterized by small quantities, large varieties and large size. During forming, multiple clamps can automatically adjust the rotation angle and stretching amount of the jaw according to the change of the die profile, so that the arrangement of the sub-clamps can be consistent with the curvature change of the die profile, and the sheet metal can fit the die more [9,10], which changes the overall motion mode of the traditional clamp, reduces the tendency of cracking, downsizes the material transition zone and improves the material utilization rate [11]. With the finite element numerical simulation method, the process of stretch forming of complex curved surface parts with the discrete clamp and the integral clamp is compared and analyzed, and related experiments are carried out. The research results expand the application scope of the discrete clamp stretch forming, which provides certain reference for the stretch forming of other complex profile parts
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