关键词: 砂轮, 表面形貌, 评价指标, 修整, 磨削

Abstract: Based on the grain protrusion areas of the grinding wheel surfaces， a concept of grain protrusion area ratio Sr was proposed. Then， two indexes， the degree of grain protrusion area βd and the degree of grain protrusion area dispersion δs were proposed to evaluate the surface topography of the grinding wheels. The dressing experiments of resin bonded diamond grinding wheels were carried out with a roller dresser， and the effects of different dressing methods， dressing depth and dressing speed ratio on the βd and δs were analyzed. The grinding experiments were carried out on the dressed grinding wheels， so as to analyze the influences of the grinding wheels with different characteristic parameters on the grinding forces and the surface roughness of the workpieces. The results show that with the smaller dressing depth， the multi-feed dressing processes and the smaller dressing ratio， then the degree of grain protrusion area is high， the degree of grain protrusion area dispersion is small， and the dressing effectiveness is good. When βd is of 69.35% and δs is as 1 000 μm2， the grinding forces and the surface roughness are the smallest， which means that the grinding performance of the grinding wheels is the best， and the dressing quality is proved to be the highest. Therefore， the proposed indexes βd and δs may effectively evaluate the surface topography of the dressed grinding wheels， and the detection method of the grain protrusion areas is simple and efficient.

Key words: grinding wheel, surface topography, evaluation index, dressing, grinding