Mechanisms of Deformation and Fracture in the Vicinity of Grinding Point

Abstract

The object of this study is to grasp, from a fractographical point of view, the deformation and fracture formation process of grinding from the grinding start to the end. By grasping the formation phenomena some typical models are constructed which will contribute to the elucidation of the formation mechanism of grinding chips and ground surface layers. Fractographical observation has been made using a SEM which allows us to grasp the three-dimensional micro-and macro-behaviors of deformation and fracture in the vicinity of the grinding zone, chips-grinding point-ground surface. Some results obtained in this study are summarized as follows:
(1) It is noted that chips and the ground surface are produced by such an interlocking system as
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(2) Materials whose matrix involves excessively hard crystal grains show peculiar deformation and fracture behaviors in the chips zone and the ground surface layer: metal grains are crushed, cracked, and partly disappear. Moreover, slip lines, slip bands, and cup-or cone-shaped dimples are generated, flowing with the matrix.
(3) From a morphological observation of the grinding zone some typical models are presented for theoretical analysis.