研削砥石における切れ刃の摩耗について (第3報)

第2摩耗領域の生成と研削現象の変化の関係について

抄録

Wear characteristics of grains of grinding wheels are investigated by observing the fused state, called the secondary zone, of the worn surface of grains. In this paper, we describe an experimental study of a criterion for the between-dressing life of Al₂O₃ wheel.
From the comparison of the formation of the secondary zone on the working surface of Al₂O₃ wheel with the change of grinding force, grinding noise, workpiece burn, surface finish, surface hardness, wear flat area ratio and wheel wear, it is shown that the deterioration of grinding performance of Al₂O₃ wheel is related to the number of grains with the secondary zone to that of grains on the working surface of the wheel. When this ratio comes to 50% the grinding performance of the wheel rapidly tends to the inferiority. From this fact, it is suggested that this ratio about the secondary zone may be used as a criterion for the between-dressing life of Al₂O₃ wheel.