Research on Improving Grinding Performance by Blast Conditioning

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In this research, a new dressing method for WA (White alundm) wheel is proposed, which may be called as "Blast conditioning". Blast conditioning is the process that low concentration slurry of synthetic resin particles with grinding fluid is blasted during only 5-15 seconds from a blasting gun by means of low pressure compressed air of about 0.3 MPa. After a vitrified bond WA wheel (WA46H7V75R) of grade H is trued with a single point or a multi-point diamond truer, blast conditioning is applied. Grinding tests of hardened steel of S45C (Hv753) are carried out following micro-observing abrasive grains on wheel periphery and evaluating distribution of cutting edges. On the basis of variations of ground suface roughness, grinding force and cutting edges on grains in relation to increment of stock removel, the effect of blast conditioning is considered. Obtained results are summarized as follows :(1) Although an ideal cutting edge distribution is produced by blast conditioning, the ground surface roughness is inferior to that without blast conditioning. This experimental result is in out of accordance with grinding theory.(2) The cause, that blast conditioning produces inferior ground surface roughness, is increment of distribution range due to falling away of abrasive grains from wheel periphery. Because blast conditioning not only causes micro-fracture in abrasive grains and conditions micro-cutting edges on each grain, but also removes a part of bonding material among abrasive grains.Based on the obtained results, continuing grinding tests are planned by changing the grade of WA wheel to harder I, J and K from H.