Study on Rubbing-cutting Transition Phenomena at the Depth of Cut Increase Gradually (2nd) Report

概要

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In the previous paper a cutting-beginning-model was experimentally proposed, in which chip formation begins when the end of contact of piled-up material at the rounded part of cutting edge reaches the same height as the center of that rounded part. In this paper, the validity of the model is investigated by varying the rake angle of tool and utilizing the cutting force vector diagram. And then, the flow behavior is discussed from the variation of fractional friction force acting on the successively increased contact area with the advance of tool. The main results as follows. (1) In the range of positive rake angle, rake angle has no effect on the cutting force and sliding length, before the cutting-beginning-point. After this point the cutting force changes in accordance with the magnitude of rake angle. (2) The direction of cutting force vector at the cutting-beginning-point is constant irrespective of the magnitude of roundness radius, material hardness and rake angle. But, the magnitude of vector is proportional to roundness radius and material hardness. (3) It is shown from the result of friction force analysis that the piled-up material begins to flow as a chip at the cutting-beginning-point.
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