关键词: 粗金刚石砂轮, 放电修锐, 机械修锐, 磨削力, 表面粗糙度

Abstract:  In order to solve the problems of low efficiency and environmental friendliness of ultra-hard diamond grinding wheels, ECD dressing method was used to dress coarse diamond grinding wheels to obtain high micro grain protrusion to realize efficient and precise mirror grinding of high strength and hard materials such as cemented carbide and die steel. The 46# metal-bonded coarse diamond grinding wheels were dressed by mechanical dressing and dry ECD dressing. The dressed diamond grinding wheels were used to dry axial grind cemented carbide and die steels. The influences of grinding parameters on dry grinding force, ground surface roughness and grinding force ratio of cemented carbide under mechanical and dry ECD grinding conditions were compared and analyzed. The experimental results show that the dry axial grinding forces and surface roughness of cemented carbide decrease with the increase of wheel speed, and increase with the increase of feed speed and cutting depth. Compared with mechanical dressing, the dry ECD dressing may achieve higher micro grain protrusion and better ground surface quality, as well as produce little grinding force and grinding force ratio. The dry ground surface roughness Ra of cemented carbide and die steel are as 0.058 μm and 0.022 μm, respectively.

Key words: coarse diamond grinding wheel, electro-contact discharge(ECD) dressing, mechanical dressing, grinding force, surface roughness