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运用滑移线理论推导出了带背压一道次ECAP的挤压力理论解析式,并运用Deform-3D软件对铝材的带背压ECAP过程进行了模拟验证。结果表明:挤压力的滑移线理论解与模拟均值相符;背压扩大了ECAP过程塑性变形区域,提高了材料塑性变形均匀性及应变能力,细化了晶粒;施加背压大小不变时,摩擦系数越大、模具内、外角越小,ECAP所需挤压力也越大,对模具结构、优化设计的要求越高。
The theory of squeezing force of ECAP with back pressure was deduced by the theory of slip line. Deform-3D software was used to simulate the back pressure ECAP process of aluminum. The results show that the theoretical solution of the slip line is consistent with the simulation mean; the back pressure enlarges the plastic deformation area of the ECAP process, improves the plastic deformation uniformity and strain capacity of the material, and refines the grain size; , The greater the friction coefficient, the smaller the inner and outer corners of the mold, the greater the squeezing force required by the ECAP, and the higher the requirements for mold structure and optimization design.