基于SPH方法的单颗金刚石磨粒磨削光学玻璃数值仿真

摘要

采用光滑质点流体动力学( SPH)方法，将金刚石磨粒简化为带有尖端圆弧的圆锥，对单颗金刚石磨粒在不同切削速度下切削光学玻璃的过程进行了三维数值仿真。仿真结果表明使用SPH方法可以很好地模拟脆性材料被切削过程的本构行为。通过分析单层SPH粒子被磨粒切削的过程，还原了工件整体被磨削的宏观过程；通过分析切削速度对单颗磨粒切削形成沟槽的形状以及工件残余应力的影响，得出当切削深度一定时，提高的切削速度可获得更大的材料去除率以及更好的光学玻璃磨削表面的结论。%Based on SPH (smoothed particle hydrodynamics) method, the 3D numeral simulation of single di-amond grain cutting of optical glass under different cutting speeds was carried out by simplifying diamond grain as corn shape with tip arc. The simulation results shows that the constitutive behavior of brittle materials during cutting process can be properly simulated by using SPH method. By analyzing the cutting process of single layer SPH particles, the macroscopic process of grinding was illustrated. By comparing the slot dimen-sions and residual stress after the cutting process, it is concluded that with specified cutting depth, greater ma-terial removal rate and better optical glass grinding surface can be achieved by increasing cutting speed.