Abstract
The effects of nickel layer coating abrasives on grinding performance of resin bonded CBN grinding wheel are revealed. Effects of nickel coat were studied by performing fundamental and grinding experiments, and following results were obtained. (1) Nickel coat prevents resin bond from being deteriorated by heat and keeps the capability of abrasive retention. (2) The surface unevenness of nickel coat increases the bonding between the abrasives and resin bond, and improves the capability of abrasive retention. (3) Even when a part of each abrasive is cracked out, nickel coat can still hold the remaining part of the abrasive. (4) Using nickel coat, care must be taken to improve adhesion of nickel coat not only to bond, but also to CBN. From these results, it is clear that grinding performance is influenced considerably by nickel coat. It is concluded that since high grinding performance is realized by improving abrasive retention, it is important to coat abrasives with material which has a very low thermal conductivity, to provide the coating surface with sufficient unevenness and to strengthen adhesion between CBN and coat.
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