Abstract:

In this paper, three characteristic parameters, namely, the valid grit protrusion height, the grit protrusion angle, and the grit protrusion homomorphy, are proposed to correctly evaluate the microscopic protrusion topography of grits after the dressing of the diamond grinding wheel. In the investigation, a SiC wheel dresser was employed to dress the diamond grinding wheel, and the protrusion height and the topography of grits on the dressed surface were measured. Moreover, the effects of grit size and dressing conditions on the valid grit protrusion height, the mean grit protrusion angle and the grit protrusion homomorphy were analyzed. The results show that （1） the valid grit protrusion height well describes the grit protrusion and equal-height properties of the grinding wheel surface; （2） #40, #80 and #120 diamond grinding wheels all have an obtuse grit protrusion angle, with an average value of 131°, 111° and 111°, respectively ; （ 3 ） the grit protrusion homomorphy describes the integrity of grit protrusion more preferably than the aspect ratio; （4） both a low depth of cut and a high feedrate for dressing may re- sult in a high valid grit protrusion ; （5） both a deep depth of cut and a coarse grinding wheel may result in a large grit protrusion angle ; and （6） the grit protrusion homomorphy improves with the decrease of depth of cut. It is thus concluded that the valid grit protrusion height, the grit protrusion angle and the grit protrusion homomorphy can all be used as parameters to evaluate the microscopic protrusion topography of dressed diamond grinding wheels.

Key words: grinding wheel, dressing, diamond, surface topography, parameterized evaluation