一、前言本文作者在参考文献[1]中提出了几种适合于杯—杯型复合挤压的运动学许可速度场,实验结果证明,这种多项式表达的速度场在估计挤压力方面是比较精确的。在本文中,拟利用这些速度场对复合挤压的力学特性、流动等进行分析,并将复合挤压力与纯正挤或纯反挤的挤压力进行比较。用上限法对金属复合挤压的流动进行分析,文献报导甚少。本文的分析将证明,只要速 I. INTRODUCTION In this paper, the author proposed several kinematic permitting velocity fields suitable for cup-cup compound extrusion in reference [1]. The experimental results show that the velocity field expressed by this polynomial is More accurate. In this paper, we intend to use these velocity fields to analyze the mechanical properties and flow of compound extrusion, and to compare the compound extrusion force with the extrusion force of pure extrusion or pure extrusion. Using upper bound method to analyze the flow of metal compound extrusion, there is little report in the literature. The analysis of this paper will prove that as long as the speed