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通过对等通道角挤压(ECAP)变形过程进行分析,并运用上限定理,推导出ECAP变形过程挤压力计算公式,并验证了公式的可行性。研究了模具结构和摩擦力对ECAP挤压力的影响,结果表明,随着模具内角和外角的增大,ECAP挤压力降低,模具内角对ECAP挤压力的影响更大;摩擦力对ECAP挤压力的影响显著,接触面粗糙时的挤压力是光滑时的19倍。为模具设计和模具材料、挤压设备的选择提供了理论依据。
Through the analysis of ECAP deformation process and using the upper bound theorem, the calculation formula of ECAP extrusion pressure is deduced and the feasibility of the formula is verified. The effect of die structure and friction on ECAP extrusion force was studied. The results show that ECAP extrusion pressure decreases with the increase of die internal angle and outside angle, and the influence of die internal angle on ECAP extrusion pressure is greater. The effect of squeezing pressure is significant, and the squeezing force when the contact surface is rough is 19 times when smooth. For the mold design and mold materials, extrusion equipment provides a theoretical basis for the choice.