Transactions of Materials and Heat Treatment

Title：Wall thickness accuracy of 2250 mm thin-walled head by dieless spinning with outer ring restrainning

Authors： Yang Jian Li Xinhe Yi Zhaoxiang Hou Linghua

Unit： Central South University CRRC Zhuzhou Institute Co. Ltd.

KeyWords： large thin-wall head wall thickness uniformity outer ring restrainning dieless spinning feed rate spining roller corner radius numerical simulation

ClassificationCode：TG301

year,vol(issue):pagenumber：2019,44(3):59-64

Abstract：

For the problem of wall thickness non-uniformity occurring in the traditional central restraint spinning process of thin-walled heads, a 1∶1 three-dimensional finite element model of 2250 mm large thin-walled head by dieless spinning with outer ring restrainning was constructed, and the influences of feed rate and spining roller corner radius on the wall thickness accuracy of spinning parts were studied. Research shows that in the first pass of spinning, the small feed rate and spining roller corner radius are beneficial to wall thickness accuracy, and in the subsequent expanding spinning, the greater the feed rate and spining roller corner radius, the better the wall thickness uniformity. At the same time, a 2250 mm large thin-walled head member is successfully fabricated on the platform of dieless spinning with outer ring restrainning through the optimal process parameters obtained by simulation. Moreover, the wall thickness of the formed part along the busbar direction is measured by ultrasonic thickness gauge, the wall thickness fluctuation law is basically consistent with the simulation result, and the wall thickness uniformity is good.

Funds：

国家重点基础研究发展计划（973）资助项目（2014CB046600）

杨剑（1994-），男，硕士研究生,E-mail：15673186587@163.com;通讯作者：李新和（1957-），男，博士，教授,E-mail: 13607444149@163.com

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