Transactions of Materials and Heat Treatment

Title：Influence of process parameters on springback behavior in rotary draw bending under variable elastic modulus condition for high strength stainless steel tube

Authors： Fang Jun Ouyang Fang Shang Wenxuan Lu Shiqiang Wang Kelu Xiang Junhuai

Unit： School of Materials and Mechatronics Jiangxi Science and Technology Normal University School of Aeronautical Manufacturing Engineering Nanchang Hangkong University

KeyWords： high strength stainless steel tube springback elastic modulus NC rotary draw bending plastic strain

ClassificationCode：TG386

year,vol(issue):pagenumber：2022,47(11):137-145

Abstract：

The change law of elastic modulus for high strength 0Cr21Ni6Mn9N stainless steel tube versus plastic deformation was obtained by using the repeated loading-unloading tensile tests, and the function relationship between elastic modulus and plastic strain was established, which was embedded into software ABAQUS to simulate the influences of process parameters on springback behavior in numerical control (NC) rotary draw bending for high strength stainless steel tube. Then, the sensitivity of springback to process parameters was analyzed. The results show that the change trend of the influence of process parameters on springback behavior in NC rotary draw bending for high strength stainless steel tube is similar under the conditions of variable elastic modulus and constant elastic modulus, but only the value of springback under the condition of variable elastic modulus increases. Springback angle and radius decrease with the increasing of mandrel extension length, bending speed and push assistant speed or with the decreasing of clearance between tube and mandrel, clearance between tube and bending die and friction coefficient between tube and bending die. The springback radius is more sensitive to the process parameters, and its sensitivity sorts from the largest to the smallest is clearance between tube and bending die, friction coefficient between tube and bending die, push assistant speed, bending speed, mandrel extension length and clearance between tube and mandrel, while the sensitivity of springback angle to various process parameters is not significant.

Funds：

江西省自然科学基金资助项目（20192BAB216022）；江西省教育厅科学技术研究项目（GJJ201126，GJJ180615）

作者简介：方军（1984-），男，博士，副教授，E-mail：fangjun020j13@163.com

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