关键词: 颗粒增强钛基复合材料, 混合材料模型, 有限元仿真, 磨削温度

Abstract: A three-dimension finite element model based on multi-material model is proposed to calculate the grinding temperature in high-speed grinding of particulate reinforced titanium matrix composites (PTMCs). The properties of Ti-6Al-4V matrix and TiC reinforced particles are considered in this model. The grinding temperature and its evolution are analyzed. The results show that the errors of predicted and experimental grinding temperature based on multi-material model are less than 8%, while the errors of predicted and experimental grinding temperature based on traditional homogeneous material model are more than 16%. The grinding temperature of workpiece increases with the increasing of the grinding parameters. In the case of the wheel speed of 120 m/s and the workpiece feed speed of 6 m/min, when the grinding depth increases from 20 μm to 100 μm, the grinding temperature of PTMCs increases from 346℃ to 987℃, and the temperature gradient values range increases from 1 070-624℃/mm to 1 570-1 310℃/mm. The grinding temperature and temperature gradient have significant influence on the depth of subsurface microstructure deformation layer. When the grinding depth rises from 40 μm to 80 μm, the depth of microstructure deformation layer increases from 22 μm to 40 μm. When the grinding depth is further increased to 100 μm, the depth of microstructure deformation layer reaches to 53 μm.

Key words: PTMCs, multi-material model, finite element simulation, grinding temperature