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运用有限元分析法对材料的一道次背压等径角挤压(EACP)过程进行了数值模拟研究,探讨了在不同条件下背压对塑性变形的影响特点。结果表明:背压的影响是有利的,背压扩大了EACP过程塑性变形区域,可以有效地增加试件变形量和变形均匀性,提高了材料塑性应变能力。在施加背压大小不变时,摩擦系数越大、模具内角和外角越小,EACP所需挤压力也越大,对模具结构要求越高。
The finite element analysis was used to simulate the EACP process of a single secondary back pressure. The influence of back pressure on plastic deformation under different conditions was discussed. The results show that the influence of back pressure is favorable, and the back pressure enlarges the plastic deformation area of EACP process, which can effectively increase the deformation amount and deformation uniformity of the specimen and improve the plastic strain ability of the material. When the size of the back pressure is constant, the larger the friction coefficient is, the smaller the inner angle and the outer angle of the mold are. The larger the squeezing force required by the EACP is, the higher the mold structure is required.