RPFEM在正交切削分析中的应用研究

针对典型的正交切削工艺过程,采用分析静态大变形过程的Lagrange描述法,建立了基于平面应变假设的正交切削过程的刚塑性有限元(RPFEM)分析模型;自行开发了模拟切削变形过程的刚塑性有限元分析程序,详细分析了正交切削变形全过程,计算出了变形体内部的网格变形图和速度场、应力场和应变场的分布结果和成形力随行程(时间)的变化曲线;对切削模拟过程中相关技术问题如切屑与基体材料分离准则、切屑与前刀面脱离判据等进行了系统的探讨;在网格重新划分时,采用面积加权平均和体积加权平均相结合的算法,实现新、旧网格体系之间参数的传递;以刨削为例完成了常温条件下铝试件模拟试验,试验结果证明了数值模拟的正确性.

Application of Rigid Plastic FEM in the Analysis of Orthogonal Cutting

Lagrange method for the static large deformation analysis is used to establish a rigid-plastic FEM(RPFEM) analysis model based on the orthogonal cutting process of 2D plain strain hypothesis.Based on this model,an RPFEM analysis program is developed to simulate deformation of the cutting process.The whole process of orthogonal cutting is analyzed.The rule of separation between cut chips and the work piece,the criterion of separation between chip and reamer,etc.,are discussed.Using the arithmetic of combining the total average weighted value of areas and that of volume,transfer of parameters between the new and old grids are realized when the grids are further divided.Simulation experiments of aluminum work pieces under normal temperature are performed,showing validity of the numeric method.