基于数值模拟的等通道转角扭挤工艺参数优化设计
Optimization of Processing Parameters of Equal Channel Angular Pressing and Twist Extrusion Deformation Based on Numerical Simulation
许泽银1, 赵茂俞1,2, 徐 强1
点击：3249次 下载：0次
作者单位：1. 合肥学院 机械工程系, 安徽 合肥 230022; 2. 中国科学技术大学 化学与材料科学学院, 安徽 合肥 230026
中文关键字：等通道转角扭挤； 形变； 灰色关联度； 优化设计
英文关键字：ECAPTE; deformation; grey relational grades; optimization design
中文摘要：对AISI-4140材料的等通道转角扭挤过程进行数值模拟，将扭转角β、背压P、摩擦因子μ和挤压速度v作为挤压工艺参数， 以平均等效塑性应变■m、平均等效塑性应力■m、最大损伤值δmax作为优化设计目标。运用追踪点法和灰色系统理论的灰色关联度优化工艺参数，最终使设计目标值达到■■■、■■■、 δ■■。结果表明，在施加背压的条件下，ECAPTE工艺使变形材料迅速地形变累积，最大损伤值显著地减小，使剧烈塑性变形材料组织的晶粒获得显著细化。
英文摘要：AISI-4140 material was numerically simulated by taking angle β, back-pressure P, friction factor μ and extrusion velocity v as variable process parameters. The average effective plastic strain ■m , stress ■m and maximum damage value δmax were regarded as the design object employing ECAPTE. The optimum process parameters ■■■, ■■■, δ■■ were obtained by using grey system of the average grey relational grades with trace point. The results show that δ■■ value rapidly decreases. The accumulation of deformation can be acquired through adopting optimum ECAPTE process and the severe plastic deformation makes the material grain ultra-fine.