方形等通道角挤压力计算与分析

Calculation and analysis of extrusion force in square equal channel angular pressing

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。

Througth analyzing the process of Equal Channel Angular Pressing（ECAP）deformation and utilizing the upper bound theorem,the calculation formulas of the ECAP extrusion pressure was deduced successfully,and the feasibility of the formulas was verified.The influence of the mold structure and the friction on the ECAP extrusion pressure was also studied.It is found that the ECAP extrusion pressure decreases with the increase of the mold internal and exterior angles,while the mold internal angle has greater effect on the extrusion pressure;The friction dramatically affects the ECAP extrusion pressure,and the extrusion pressure with rough contact surface is 19 times higher than that with smooth surface.The study provides a theoretical basis for mould design and the choice of mould material and extrusion equipment.