Recognition of diamond grains on surface of fine diamond grinding wheel

Accurate evaluation of grinding wheel surface topography is indispensable for the investigation of grinding principle,optimization,modeling and simulation of grinding process,which,to a large extent,depends on accurate recognition of abrasive grains from the measured wheel surface.Detailed analyses of the grain size distribution characteristics and the grain profile wavelength of fine diamond grinding wheel used for ultra-precision grinding are presented.The requirements of spatial sampling interval and sampling area for instruments to measure the surface topography of diamond grinding wheel are discussed.In order to recognize the diamond grains,digital filtering is used to eliminate high frequency noise from the measured 3D digital surface and then the geometric characteristics of diamond grains are extracted.A method based on the grain profile frequency characteristics,the distance between two adjacent diamond grains and the diamond grain curvature is proposed to recognize the diamond grains.A 3D non-contact profiler based on scanning white light interferometry is used to measure the surface topography of a #3000 resin bonded diamond grinding wheel,and then the diamond grains are recognized.The experimental results show that the newly proposed method is reasonable and effective.