【摘要】 对使用有限元法进行切削过程模拟的关键技术进行了分析。针对刀尖单点接触问题,提出了一种网格错位分析方法,提高了模拟计算结果的稳定性;采用基于几何准则和等效应力的综合分离准则来解决切屑层与金属基体材料之间的分离问题,并给出了一种粘接单元法,从而提高了计算精度;根据基于几何判断和应力分布的复合判据法则,解决了切屑上的约束节点与前刀面的释放问题。实例表明,所提方法很好地解决了实际模拟计算过程中的关键技术问题。更多还原

【Abstract】 Key Techniques in the process of using FEM to simulate the cutting are analyzed. Grid transposition method is advanced with the aim of dealing with single-point touch between tool tip and workpiece; the stability of results of simulation calculation is improved; the synthetic separation rule on the basis of geometry rule and equivalent stress is adopted to deal with the separation of cutting layer metal material and metal body material. Meanwhile, felting cell method is advanced to improve the calculation precision; the compound criterion based on geometry judgment and stress distribution is used to solve the divorce problem of restriction nodes on the chip and cutting tool face. The real case application shows that key techniques in practical simulation calculation can be well solved with the proposed methods.更多还原