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On the Chipping Characteristic of High Toughness Abrasive Grains for Application to Heavy Grinding (II)

The object of this experimental study is to investigate the compatibility of abrasive grains to various workpiece materials from a standpoint of micro-chipping characteristic as determined by fly milling test of a single grain. In the last research a series of fly milling tests were performed on five abrasive grains using a S 45 C carbon steel plate.In the present study an additional series of fly milling tests were performed on the same five grains to two workpiece materials (SUS 27 and hardened SKS 31) combinations. The experimental procedure used was the same as in the preceding study. It was found that in the case of the SUS 27 steel the roasted 2A or the roasted microcrystalline grains fractured less frequently than the 2A or the microcrystalline grains, and that the sintered grain had exceptionally high resistance to not only chipping fracture but also attritious wear. The test result for the SKS 31 steel was much the same as that in the SUS 27 steel with the exception of the sintered grain, which showed the lowest resistance to the attritious wear for the SKS 31 steel. The results on the SKS 31 were almost in accord with that on the S 45 C steel reported in the last paper.