Transactions of Materials and Heat Treatment

Title：Numerical simulation and process optimization on NC bending for stainless steel continuous multi-bend tube

Authors： Yang Ruimeng1 Yue Tao1 Lin Lei1 Li Li2 Chen Yong1 Zheng Senmu1

Unit： 1.R&D Center Sichuan Aerospace Changzheng Equipment Manufacturing Co. Ltd. 2.First Military Representative Office of Rocket Force in Chengdu Area

KeyWords： 0Cr18Ni9 stainless steel continuous multi-bend tube NC bending stress interference virtual orthogonal test

ClassificationCode：TG386

year,vol(issue):pagenumber：2022,47(8):105-111

Abstract：

For the problems of poor forming quality and low dimensional accuracy for 0Cr18Ni9 stainless steel continuous multi-bend tube in the practical production, the process parameters were optimized by numerical simulation method of NC bending to improve the forming quality of products. Then, based on the finite element simulation platform, a three-dimensional finite element model of tube NC bending, mandrel retracting and springback was established, and the accuracy of the model was verified by comparing the simulation and test results. Since the continuous multi-bend tube was composed of multiple bending sections, the influences of key process parameters in the forming process for each elbow on the forming results were studied firstly, and the combination of process parameters was optimized. Based on this, the forming simulation of continuous multi-bend tube was carried out. The results show that the qualified tube cannot obtained by simply using the optimal process parameter combination of each single bend tube to form continuous multi-bend tube. However, by adjusting the combination of bending angles for two bends before and after to compensate the influence of stress interference between two bend elbows on the forming accuracy, and the qualified product with the forming quality meeting the requirements is obtained.

Funds：

国家自然科学基金委员会-中国航天科技集团有限公司航天先进制造技术研究联合基金资助项目（U1737203）

杨睿萌（1995-），女，硕士，助理工程师 E-mail：yangrm00@163.com

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