论文部分内容阅读
考虑到FEM(Finite Element Method)进行切削仿真时会因网格畸变而影响计算精度,因此采用新型光滑流体粒子动力学(SPH,Smoothed Particle Hydrodynamics)无网格法对单颗CBN(Cubic Boron Nitride)磨粒磨削钛合金TC4的过程进行三维数值仿真。通过建立与真实磨粒相似、刃部有一定圆弧半径的磨粒FEM模型及钛合金工件的SPH模型,研究了磨粒切削深度对磨削力及磨屑形成过程的影响。分析结果表明:磨削力随着磨粒切削深度的增大而增大,磨削力比则随着切削深度的增大而减小;当磨粒速度一定时,TC4工件的磨屑形成情况与切削深度存在重要关系。仿真结果与理论分析吻合较好,验证了SPH方法模拟单颗粒磨削钛合金材料的可行性。
Considering that FEM (Finite Element Method) will affect the calculation accuracy due to grid distortion when cutting simulation, a novel meshless method called Cubic Boron Nitride (CBN) is adopted in the meshless method based on the new Smoothed Particle Hydrodynamics (SPH) Grinding titanium alloy TC4 process for three-dimensional numerical simulation. The effect of abrasive depth on the grinding force and the formation of wear debris was studied by establishing the FEM model of abrasive grains with similar radius and the SPH model of titanium alloy. The analysis results show that the grinding force increases with the increase of the cutting depth, and the grinding force ratio decreases with the increase of the cutting depth. When the particle velocity is constant, the formation of wear debris of the TC4 workpiece There is an important relationship with the depth of cut. The simulation results are in good agreement with the theoretical analysis. The feasibility of using SPH method to simulate single particle grinding of titanium alloy is verified.