Transactions of Materials and Heat Treatment

Title：Numerical simulation and experimental study on internal expansion cold push bending for stainless steel bent tube with large diameter to thickness ratio

Authors： Yang Dong Xu Xuefeng Fan Yubin Wu Shitian

Unit： Nanchang Hangkong University

KeyWords： push bending bent tube reverse thrust tube blank structure lubrication method

ClassificationCode：TG394

year,vol(issue):pagenumber：2022,47(10):154-161

Abstract：

Based on the numerical simulation and experimental study of internal expansion cold push bending for Φ70 mm×2 mm stainless steel tube, the influences of tube blank structure, filling method of polyurethane filling blocks, reverse thrust and lubrication method on the forming quality of stainless steel bent tube with large diameter to thickness ratio and the bending angle of 118.5° were discussed. The results show that the compensation end structure can effectively restrain the material accumulation and thickening, and reduce the risk of wrinkling in the bending inner side of tube blank. When the thickness of polyurethane filling block in contact with punch is 30 mm and the thickness of the rest of polyurethane filling blocks is 15 mm, the support effect of filling blocks is better and more conducive to force transmission. However, the reverse thrust affects the internal pressure and material flow. If the reverse thrust is too small, the internal pressure of tube blank is insufficient, and the bending inner side doe

Funds：

国家自然科学基金资助项目（51975267）

杨东（1992-），男，硕士研究生，E-mail：erciayang1@163.com；通信作者：徐雪峰（1984-），男，博士，教授，E-mail：xfwinzy@163.com

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