Transactions of Materials and Heat Treatment

Title：Comparative study on stretch-bending by force and displacement control modes for large-angle profile frame

Authors： Li Qian Guo Hui Zhang Jiegang Li Yijie Jin Chaohai

Unit： Tianjin Aerospace Long March Rocket Manufacturing Co. Capital Aerospace Machine Co. Ltd. Capital Aerospace Machinery Co. Ltd. Beihang University

KeyWords： stretch-bending large-angle profile frame force control mode displacement control mode springback

ClassificationCode：TG386

year,vol(issue):pagenumber：2021,46(2):124-129

Abstract：

For large-angle profile frame of a carrier rocket, the stretch-bending processes under force and displacement control modes were simulated and studied experimentally, and the distribution situations of tangential stress and tangential strain along the profile inside and outside of profile section and the springback situation under two control modes were analyzed and compared by simulation. The simulation results show that the advantage of the displacement control mode is that the increasing tensile force causes the tangential stress difference inside and outside of profile section to decrease during the bending cladding process, and at the same time, a certain reinforcing effect produces in the covered deformation area. Compared with the force control mode, its springback is small. Furthermore, the dimension accuracy of part and the deformation degree after quenching in the stretch-bending under two control modes were analyzed experimentally by different process parameters. The experimental results show that, under the optimal process parameters, the size accuracy of parts formed by the displacement control mode is higher than those formed by the force control mode, the deformation degree after quenching is smaller, and the subsequent manual trimming amount is small.

Funds：

航天一院工艺改进课题（Y41203-53C）

李倩(1985-)，女，硕士，工程师，E-mail：liqianfly99@163.com

Reference：

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