Transactions of Materials and Heat Treatment

Title：Analysis on extrusion force of open punch rotary extrusion based on upper limit theory

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ClassificationCode：TG302

year,vol(issue):pagenumber：2021,46(5):240-245

Abstract：

The mechanics analysis of the new process for open punch rotary extrusion was conducted. Then, based on the dual stream function, the kinematics allowable velocity field was derived, the upper limit theory was introduced to analyze the plastic forming problem in the extrusion process, and the calculation formula of extrusion force was established. For the AZ80 magnesium alloy material, the numerical simulation was conducted by simulation software Deform-3D to verify the accuracy of the theoretical calculation results, and the physical experiment of open punch rotary extrusion was carried out by thermal simulation tester Gleeble-3500 to explore the influence of rotary speed of die on rotary extrusion force of open punch. The results show that as the rotary speed of die increases, the extrusion force gradually decreases, the extrusion force obtained by the upper limit method is greater than that of the numerical simulation and physical experiment, and the average error is 6.03% and 4.56% respectively, which shows that the rationality of the kinematics allowable velocity field and the upper limit solution and provides theoretical support for the further development of the open punch rotary extrusion process.

Funds：

国家自然科学基金资助项目(51775520)

宋晓茜（1997-），男，硕士研究生 E-mail：2205398723@qq.com 通讯作者：王强（1973-），男，博士，教授 E-mail：wangqiangzb@sina.cn

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