Study on the Ground Surface Quality of Cr_2O_3 Coatings

摘要

The ground surface quality of Cr_2O_3 coatings is investigated in this paper. The influence of some typicalrngrinding parameters on ground surface integrity is discussed in detail. It is found that the ground surfacernroughness increases with the increase of depth-of-cut. The surface finish is improved as the increase of grindingrnspeed, but too high grinding speed may result in serious vibration of the system. The increase of workpiece speedrncauses deterioration of surface finish and produces big grinding noise. Experiments on plateau treatment after thernrough ground surface were also carried out. The surface profile of the ground surface after plateau treatmentrnbecomes much smoother than the former rough surface. Some sharp peaks on the ground surface may berneffectively removed by the plateau treatment, which produces a reasonable surface profile and can stand muchrnmore load. Surface observations and analyses show that plastic deformation and micro-cracks occur on the groundrnsurface. The material removal process is primarily a serious of localized surface fractures accompanied byrnmulti-plastic deformations. Much more plastic deformation and micro-cracks emerge on the ground surface whenrnthe depth-of-cut increases. The increase of workpiece speed may produce more surface micro-cracks, but thernrelative increase of grinding speed is beneficial to ground surface quality.