Transactions of Materials and Heat Treatment

Title：Research on numerical simulation of constant force spring in the continuous bending process by compositing stretch and compression

Authors： Li Zhanhua Han Jingtao Cheng Jing Yu Chunyu Zhang Congfa

Unit： University of Science and Technology Beijing Institute of Spacecraft System Engineering CAST

KeyWords： continuous bending process by compositing stretch and compression constant force spring sheet forming numerical simulation

ClassificationCode：TG386.3+1

year,vol(issue):pagenumber：2016,41(5):33-38

Abstract：

Due to the characteristic of equal curvature of each position, the performance of the constant force spring is excellent. However, due to its geometry constraint in stabilizing heat treatment, it exhibits the bias of outer diameter greater than the inner diameter in the conventional forming process which affects its accuracy. A novel method of the continuous bending by compositing stretch and compression was proposed, and formed workpiece was obtained. Therefore, the above bending process was analyzed by the numerical simulation method, and the key technological parameters such as the post tension, the die clearance, the punch fillet radius and the strip thickness, etc. influencing bending process were studied. And then the simulation results were verified by experiments. On the basis of the compression and bending, the tension was applied at both sides of the strip in the bending method. Furthermore, positive and negative bending were carried out, and the residual stress state was optimized. So the stability of the part was improved.

Funds：

北京空间飞行器总体设计部资助项目（WY-XXJ-XRW026）

李占华（1983-），男，博士研究生韩静涛（1957-），男，博士，教授，博士生导师

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