论文部分内容阅读
材料成形过程中,模具型面磨损分析的关键是获得接触应力的分布及演化特点。利用高强钢U形件弯曲模型得到模具型面接触应力解析式。通过准静态有限元仿真分析,获得了弯曲凹模圆角型面瞬态→稳态的接触应力演化趋势及单-双峰分布特征。瞬态区接触应力峰值波动剧烈呈现尖锐的双峰分布;稳态区平缓趋于直线。对比分析高强钢DP600与低强度钢DC04的接触应力峰值曲线,揭示了高强钢成形模具型面局部磨损的主要原因,并通过实例验证了其合理性,为提高模具寿命提供了途径。
Material forming process, the mold surface wear analysis of the key is to obtain contact stress distribution and evolution characteristics. Using high strength steel U-shaped bending model to obtain contact surface stress analysis formula. Through the quasi-static finite element simulation analysis, the evolution trend and the single-bimodal distribution of contact stress in the transient-steady state of the curved concave profile were obtained. The peak value of the contact stress in the transient area fluctuated sharply with a sharp bimodal distribution. The steady state area tended to be straight. By comparing the peak stress curves of high strength steel DP600 and low strength steel DC04, the main reason for the local wear of the high strength steel is revealed. The rationality of the model is verified by examples, which provides a way to improve the service life of the die.