【摘要】 金属基复合材料(MMCs)具有强度高、密度小的特点,可广泛应用于航空航天和汽车领域,但是这种材料的难加工特性限制了其进一步推广。采用超声振动切削可以降低切削力和切削热效应,对于难加工材料和难加工零件的精密加工具有特效[1]。本文采用金刚石刀具进行切削试验,对超声振动切削金属基复合材料的切屑形态、切屑变形系数和剪切角、切削表面微观形貌与粗糙度、加工表面残余应力及刀具磨损等几方面进行了深入的研究,并与非振动切削方法进行了对比。更多还原

【Abstract】 Metal matrix composites (MMCs ) has high strength and low density. It can be widely used in the field of aerospace and automobile industry. But it is very difficult to machine due to the high hardness reinforced particles, the difficult-to-machine characteristics of this material limit the further application and promotion of the MMCs. The ultrasonic vibration cutting method can reduce the cutting force and heat effectively, and it has special effects on precision machining of hard-to-machine materials and hard-to-machine parts. In this paper, through the experiments using PCD cutting tools and ultrasonic vibration cutting method to cut the MMCs, the chip shape, chip deformation coefficient and the shear angle, surface topography and roughness, surface residual stresses and tool wear of MMCs in the cutting process are studied in-depth. Also the results of ultrasonic vibration cutting are compared with the results of non-vibration cutting.更多还原