抄録
In a grinding process in which the grain edge fracture predominates over its attritious wear, the dependence of the fracture characteristics upon the grain depth of cut must be taken into account for better understanding of the grinding process, since the depth is not constant but varies with relative location of the grain edges on the wheel surface. Therefore, the effects of grain depth of cut upon the onset probability of the edge fracture, the height loss of the grain tip, and the transition probability of the edge shape are investigated. From a fracture test of WA single grain, of which test method was reported in the previous paper, the probability density of the height loss for a constant grain depth of cut is found to be conformed with a gamma distribution. Another fracture test with a special model wheel having 125 abrasive grains on a certain circumferential line is also conducted, and it reveals that the fracture onset probability and the height loss are proportional to the grain depth of cut. Their proportional constants are obtained experimentally as the maximum likelihood estimator. Two series of fracture tests of single grain under the same grinding conditions but with different grain depth of cut are further conducted, and they reveal that the transition probabilities of the grain edge are independent of grain depth of cut.
