Transactions of Materials and Heat Treatment

Title：Backpressure cold finishing technology for warm extrusion thin-walled steel cylinder part

Authors： Li Chao Xu Zhenying Yang Xiaming Zhang Tailiang Wang Yun

Unit： Jiangsu University

KeyWords： Jiangsu Winner Machinery Co. Ltd.

ClassificationCode：TG376.1

year,vol(issue):pagenumber：2016,41(10):82-87

Abstract：

For the inner cavity bulges on the top of warm extrusion thin-walled steel cylinder part, the whole forming process and the causes of product defects were analyzed by velocity field, stress field and point tracking methods. In the beginning of the cold finishing process, the stress of upper metal on the top of deformation zone is less than that of the bottom, so the metal has a trendency to flow upward. Besides, the surrounding metal moves slowly than the central metal due to friction, with the downward movement of the top die, bulges emerges at the inner cavity. The backpressure cold finishing technology was put forward by analyzing the force from the top of extrusion part. And the material flow on the top of workpiece was controlled again by the pressure from the top of workpiece to restrain material from flowing upwards. Furthermore, the feasibility of the new technology was analyzed based on theories of plastic mechanics, and the backward force was optimized by numerical simulation. The result shows that the appropriate backward forces of two cold finishing processes are 3460 N and 7500 N respectively. The experiment was done on the self-developed backpressure cold finishing molding machine. The results show that the defects can be completely eliminated.

Funds：

江苏省科技成果转化专项资金项目(SBA2014 030056)；江苏省科技支撑计划项目(BE2013009-1)；“青蓝工程”学术带头人（苏教师（2014）23号）

作者简介：李超（1992-），男，硕士研究生 E-mail：394708557@qq.com；通讯作者：王匀（1975-），男，博士，教授 E-mail：wangyun@ujs.edu.cn

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