摘要
通过观察螺钉冷挤压成形中组合凹模的失效现象,发现组合凹模的失效形式为疲劳裂纹,其主要出现在挤压锥角部分,且沿与凹模内表面成45°的方向产生并向外表面扩展。利用DEFORM-2D软件对螺钉挤压成形进行数值模拟,分析组合凹模的应力分布及变化趋势,探讨组合凹模的疲劳破坏机理,进而为冷挤压组合凹模的工艺改进和模具优化设计提供理论依据。
The failure of cold extrusion combination concave dies was observed through the experiment of screw cold extrusion forming. The results Indicate that the fatigue crack is the main failure form of the cold extrusion combination concave die and the crack occurrs mainly in the extrusion cone angle 45 and expands to outward. The cold extrusion process of screw was simulated by using DEFORM-2D. The stress distribution and change trend of the cold extrusion combination concave die were analyzed, the fatigue failure mechanism of the die was discussed. The simulation results give theoretical basis for improving and optimizing the structure of die.
出处
《热加工工艺》
CSCD
北大核心
2009年第9期69-73,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(50874083)
关键词
冷挤压
组合凹模
疲劳裂纹
数值模拟
cold extrusion
combination concave die
fatigue crack
numerical simulation
