鋼材の研削焼けおよび研削割れ

Abstract

On the grinding work we have previously seen a few investigations, but all of them was limited to inspect only from the side of steel under the grinding. The present authors recognized that failures of grinding work were caused (induced) from mutual relations of the condition of grinding work and steel under the grinding, and, therefore, inspected from both sides of them, and chiefly on bearing steel. On the experiment has been carried out several inspections by the conditions determined previously from the grinding work and obtained experimentally from the limit depth of cut to which the grinding burn on grinding crack occurred on the surface of steel. We could recognize that the formation of failure was dependent on grinding heat which is affected by conditions of the grinding work or the properties of steel under the grinding. The results were as follows: (1) On the grinding burn of various steels, the limit depth of cut of quenched steels is smaller than that of annealed one. (2) Thermal diffusion in the steel under the grinding is smaller, the more sensible grinding burn or grinding crack is. (3) Tempering temperature of the steel after quenching is higher, the less the formation of grinding burn or crack occurs. (4) In case of low tempering treatment, grinding crack precedes to grinding burn, but in case of high tempering treatment, this aspect becomes opposite. (5) Against several phenomena mentioned above, we carried out theoretical investigation from both sides of the grinding work and of the steel.