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The microstructure of dressed abrasive cutting edges and the transitional behavior of the cutting edges in the initial stage in grinding are investigated by observing directly dressed abrasive cutting edges in detail and by pursuing the behavior of the particular cutting edges in grinding. The relation between the transitional behavior of the cutting edges and the grinding force in the initial stage in grinding is examined by measuring the variations of the cutting edge ratio and the grinding force in grinding.The conclusions obtained in this study are as follows : (1) The surface roughness of dressed abrasive cutting edges is approximately flat though the dressed streak is observed on the surface. Accordingly the microunevenness reported previously cannot be found on the surface.(2) A lot of nondirectional microcracks are observed on the surface. Therefore the surface structure is fragile and the fragile layer is easily removed by the replica operation and in grinding. The microunevenness exists under the fragile layer and is appeared after the fragile layer is removed.(3) The grinding force and the cutting edge ratio are high in the initial stage in grinding. From these results, it is considered that the flatness of the dressed cutting edges influences the high grinding force in the initial stage with some reason.

Microstructure and Transitional Behavior of Dressed Abrasive Cutting Edges