基于DEFORM的钎头温挤压成形有限元模拟

Finite Element Simulation of Warm Extrusion for Rock Drill Head Based on DEFORM

通过有限元分析软件DEFORM对40Cr钎头温挤压成形的温度场、等效应力场进行了数值模拟。结果表明,在成形过程中排粉沟和锥孔底部应力较大,且刃角转折处容易出现局部应力集中。对比分析得到最佳挤压工艺参数为:加热温度700℃、挤压速度50 mm/s。在最佳工艺参数下,模具充填良好,排粉沟和锥孔底部应力状态得到改善,刃角转折处应力集中也得到减轻,延长了模具寿命。这能为40Cr钎头的生产提供指导。

The temperature fields and equivalent stress fields of 40Cr rock drill head during warm extrusion were simulated using FE software DEFORM.The results show that the stress is larger at the powder discharging groove and the bottom of the cone hole,and the local stress concentration usually appears in the edge corner.After comparative analysis,it was obtained that the optimal process parameters are the heating temperature 700℃ and the extrusion velocity 50 mm/s.Under the optimal process parameters,the die is filled well,the stress states of the groove of discharging powder and the bottom of cone hole are improved,and the stress concentration can be effectively mitigated,which can prolong the die life.This can provide guidance for the production of 40Cr rock drill head.