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为了研究高温条件下难变形合金等径角挤压(ECAP)的变形状况,运用Deform软件数值模拟和物理模拟的方法研究了多道次ECAP铅挤压的金属流动过程。结果表明,采用压缩实验获得的材料本构关系可以有效地减小数值模拟误差;物理模拟挤压过程中模具通道内壁侧边的毛刺对材料的最大挤压载荷有很大的影响;在上1道次冲头堵塞通道时,下1道次的最大挤压载荷比上1道次大20%。
In order to study the deformation of ECAP at high temperature, the metal flow process of multi-pass ECAP lead extrusion was studied by Deform software numerical simulation and physical simulation. The results show that the material constitutive relationship obtained by the compression experiment can effectively reduce the numerical simulation error. The burrs on the inner wall of the mold passage during the physical simulation extrusion have a great influence on the maximum compressive load of the material. When punching the channel, the maximum compressive load of the next pass is 20% larger than that of the previous pass.