セラミックスの研削における材料端部の欠け : 二次元き裂のJ積分からみた材料端部でのき裂進展挙動

概要

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Chipping at work corner in grinding is formed by the propagation of an already initiated crack to the work end surface. The present paper deals with the propagation facility of the crack initiated near the work corner by evaluating its J integral with respect to that far from the work corner. The focus is the change in the J integral related to the geometric factors such as position.1ength and angle of the initiated crack and active position of grinding force. Boundary element method (BEM) is used to analyze the model of single point grinding. The typical shape and size of the crack in the model is experimentally determined by the grinding of soda-lime glass with single point diamond tool. Main conclusions obtained are as follows : (1) The J integral of the already initiated crack has a peak value due to the grinding force at the position slightly apart from the crack tip. (2) The peak of J integral drastically increases in case that the crack exists within a certain distance from the work end so as to bring about the chipping at the corner. (3) Increases in length and angle of the crack also elongate this distance which determines the chipping size at the work corner.
1990-05-05