凿岩钎头壳体温挤压凹模的有限元分析

FEM Analysis on Warm Extrusion Concave Die of Drilling Bit Shell

运用有限元分析软件ANSYS的接触分析,对凿岩钎头壳体温挤压成型凹模进行了数值模拟。采用大变形弹塑性有限元方法,接触类型采用面-面接触的半柔体-柔体接触,对不同摩擦系数下,挤压凹模的总体等效应力场、凹模不同剖面和不同表面的等效应力情况、凹模的剪应力进行了分析。结果表明:凹模工作的危险区域分布在成型排粉沟的凸面附近,挤压过程中凹模和坯料之间合适的摩擦系数取值在0.10～0.15之间。结合工业考核,对挤压模具和挤压工艺进行了改进。

The forming process of a warm extrusion concave die about the drilling bit shell was simulated numerically with contact analysis modules in ANSYS. According to several friction coefficients, the whole equivalent stress field of the die, the equivalent stress status of the die on different profiles and different surfaces, and the sheafing strength of the die were studied with hypothesis of large deflection elastic-plastic FEM while and semi-flexible to flexible contact about surface to surface contact style. The results show that the dangerous working regions in the die are found near the convexity of molding vent groove, and the appropriate friction coefficient range between the die and the billet is from 0.10 to 0.15 during extrusion. Considering the scene of production, the extrusion die and the extrusion process were improved.