基于DEFORM-3D的温挤压凸模失效分析与探讨

Failure Analysis and Discussion of Warm Extruding Punch Based on DEFORM-3D

结合生产实际利用DEFORM-3D有限元模拟软件对某深盲孔壳体零件进行数值模拟,探讨了该零件温挤压加工中凸模应力应变分布规律,分析了温挤压凸模等效应力场、等效应力-凸模行程曲线、等效应变场、轴向压应力和拉应力、轴向应力-凸模行程曲线,并重点研究了应力应变对温挤压凸模早期失效的影响。凸模承受的压应力超过模具材料的抗压极限时凸模会发生镦粗现象;当凸模承受的拉应力超过其许用应力时,凸模就会产生破裂。应力集中主要在凸模柄端截面尺寸突然减小处,因此设计凸模时,柄端截面尺寸不能急剧减小,否则凸模容易在此处断裂而使模具失效。

The warm extruding process of a deep blind hole shell part is simulated usingDEFORM-3D software with finite element method, stress distribution in different stroke ofpunch is discussed, analysis of effective stress field of punch,the effective stress punch strokecurve, the effective stress punch stroke curve, the effective strain distribution of punch, axialstress of punch stroke curve, and the influence of mechanical behavior to nearly failure of warmextruding punch is focus researched. When the punch bears the compressive stress exceedingthe compression limit of the die material, the punch will occur upsetting phenomenon. When thetensile stress of the punch exceeds its allowable stress, the punch will burst. The stressconcentration is mainly due to the sudden reduction of the section size of the handle end of thepunch. Therefore, when designing the punch, the section size of the handle end can not besharply reduced, otherwise the punch will break down here and make the die fail.