An Investigation of Surface Roughness in Ultrasonic Assisted Dry Grinding of 12Cr2Ni4A with Large Diameter Grinding Wheel
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Ultrasonic assisted dry grinding (UADG) is a novel green manufacturing technology for decreasing the negative environment impact of cutting fluids and improving the surface characteristics. In this study, the influences of the ultrasonic amplitude, grinding depth and grinding velocity on the surface roughness in ultrasonic assisted dry grinding of 12Cr2Ni4A with a large CBN grinding wheel were investigated. Due to the Poisson effect, the ultrasonic assisted dry grinding using a large diameter grinding wheel is the combination of axial ultrasonic assisted grinding and radial ultrasonic assisted grinding. The results indicated that the main axial ultrasonic component tended to smooth the surface topography by increasing the interaction overlap of the adjacent cutting traces, but it would result in more side flow/ploughing on the surface at a larger ultrasonic amplitude; the radial ultrasonic component exerted a function on the increase of the surface roughness through deepening the individual grinding trajectories. Thus, the surface roughness decreased first and then increased with the increase of grinding depth due to the combined contribution of axial and radial vibrations. However, the improving effect of ultrasonic vibration on the surface roughness gradually weakened with the increase of grinding velocity. Under proper operating parameters, surface roughness obtained in ultrasonic assisted dry grinding can be reduced up to 30% compared with that of common dry grinding.
KeywordsUltrasonic assisted dry grinding Steel Large grinding wheel Surface roughness
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