关键词: 多层钎焊砂轮, 电解修整磨削, 中间相炭微球, 氧化膜, 亚表面损伤

Abstract: The oxide film of large particle size multi-layer brazed diamond grinding wheel had poor quality and insufficient thickness during electrolytic dressing, which led to poor grinding performances. MCMB were added to the abrasive layers to improve this situation. The effects of different MCMB contents on the performances of the grinding wheel and the electrolytic dressing grinding characteristics were investigated. The results show that MCMB may significantly improve the electrolytic film-forming ability of the grinding wheel, the maximum thickness of the oxide film is as 104 μm, and the compactness and adhesion are improved. The ground surface morphology of the test groups containing MCMB has higher integrity and fewer fracture pits. Compared with the test groups without MCMB, the values of surface roughness Ra of the MCMB test groups with a volume fraction of 5% decrease by 29.8% when the workpiece speed is as 40 mm/s and the grinding depth is as 15 μm, and the subsurface damage depth is reduced by 47.9% when the workpiece speed is as 30 mm/s and the grinding depth is as 20 μm.

Key words:  , multi-layer brazed grinding wheel, electrolytic dressing grinding, mesocarbon microbead(MCMB), oxide film, subsurface damage