锻压技术

基于上限理论的开口凸模旋转挤压力分析

英文标题：Analysis on extrusion force of open punch rotary extrusion based on upper limit theory

作者：宋晓茜王强赵淑珍张旭峰张治民

分类号：TG302

出版年,卷(期):页码：2021,46(5):240-245

摘要：

对开口凸模旋转挤压成形新工艺进行了力学解析，基于双流函数导出了运动学许可速度场，引入上限理论分析了挤压过程中的塑性成形问题，建立了挤压力的计算公式。为了验证理论计算结果的准确性，选取AZ80镁合金材料，利用Deform-3D模拟软件进行数值模拟，并采用Gleeble-3500热模拟实验机进行开口凸模旋转挤压物理实验，探究了凹模旋转速度对开口凸模旋转挤压力的影响。结果表明：随着凹模旋转速度的增加，挤压力逐渐减少；上限法求得的挤压力均大于数值模拟与物理实验的挤压力，且其平均误差分别为6.03%和4.56%，表明了运动学许可速度场和上限解的合理性。为开口凸模旋转挤压工艺的进一步发展提供了理论支持。

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.

基金项目：

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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