超仕上性能の特性値としての臨界圧力とこの圧力における仕上性能に及ぼす砥石仕様の影響

超仕上砥石の仕上性能向上に関する研究(第2報)

抄録

On the superfinishing stone of fine grain, soft grade and sulphur treated, which have been recently employed to comply with the request for high stock removal together with lowest cost and high quality surface, an efficient utilization of the critical stone pressure P_c is emphasized again in this paper as an important characteristic concerned with actual performance for an advanced selection and manufacture of the well-fitted stone for the object. Chiefly from the finishing data of the bearing steel with stones of WA 3000 V (S) having various structure and hardness, the relations are discussed between stone specification and P_c, stone wear rate W_c/P_c, stock removal T_c or economic ratio T_c/W_c at the pressure of P_c. Consequently, it is proved that the user can almost appoint the right stone which holds excellent performances coincidently in T_c and T_c/W_c by P_c and the Rockwell hardness RH of the stone. In practice, this stone is desirable to be applied at the pressure of (0.8-0.9) P_c, for example, to secure a mirror finished surface of high quality and a stable stock removal. Furthermore, the universality of relationships between stone specification and the above characteristics and the possibility of selecting a fitted stone by the above procedure are checked up with three different examples in grain size, working material or conditions.