新型等通道转角挤压模具优化设计

Optimal design of a new die in ECAP

设计出一种新型的等通道转角挤压模具,推导出该模具下工件变形等效应变值的理论表达式,并应用3D有限元分析技术,分析了模具转角区的外倒角半径R和内倒角半径r的变化对工件变形的变形行为、应变分布和挤压所需的最大载荷的影响。研究结果表明,R和r的增大都可以减小变形死区面积,但r影响更显著;R的增大将导致最大载荷的迅速减小,而r对其影响甚微。

The principle of a new Equal-Channel Angular Pressing （ECAP） die which has different fillet radii at the corner was illustrated. A more comprehensive formula which can be used to estimate the equivalent strain on the deformed work-piece was established. The effect of outer fillet radii R and inter fillet radiir on the deformation behavior,the distribution of the equivalent strain and the maximum load was analyzed by 3D Finite Element Analysis （FEA）. It shows that,the increase of R and r,the area of dead zone would decrease,while the effect oft is more notable,and the effect of the increase of r to the maximum load is much small,while the maximum load would has a rapid reduce as the increase of R.