Abstract:

Cutting process of CBN grit was simulated by SPH.Mesh constraint was solved when the chip separation was simulated by mesh method.Wear mechanism of CBN grit and cutting deformation mechanism of  workpiece material were analyzed according to the stress field variation of CBN grain,workpiece material and motion situation of discrete SPH particles.It is concluded that stress concentrations occur on the tip and extrusion plane edges of grit,thus the portions tend to wear,and even generate micro-breakage.Workpiece material produces elastic-plastic deformation,flows to the side and front owing to the extrusion of abrasive grain,and finally forms chip in front of abrasive grain.

Key words: CBN grit, wear, simulation, smoothed particle hydrodynamics(SPH)

摘要：

采用光滑粒子流体动力学法进行CBN磨粒切削过程仿真。该方法解决了网格法模拟材料分离时的网格束缚问题。通过切削过程中磨粒与工件材料的应力场变化以及离散SPH粒子的运动情况,分析了CBN磨粒的磨损机理以及工件材料的切削变形机理。研究结果表明:磨粒的顶部与挤压面棱边接触应力集中,易发生磨耗与微破碎磨损;工件材料受磨粒的推挤发生弹塑性变形而沿磨粒的侧向及前方隆起,并于磨粒的前方挤出而形成切屑。
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关键词: CBN磨粒, 磨损, 仿真, 光滑粒子流体动力学法