放電加工用グラファイト材の高速高精度加工に関する研究 : こば欠け現象の把握と加工条件, 工具形状が及ぼす影響

概要

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The purpose of this study is to improve a productivity of a manufacturing of graphite. Generally, in case of the high speed process, several chippings arise on the surface and the edge of graphite. Phenomenon of the chipping hasn't been known well. Therefore, the manufacturing is processed with a low speed. This study is to grasp a phenomenon of the chipping and an influence of the cutting condition. A style of a destruction mechanism is a crack type. There are normal cutting surface and many craters. The authors confirmed that these craters were deeper than the cutting surface. The width of edge chipping increases in proportion to the feed rate. However, it is not related to the radial depth of cut and the cutting speed. It is related to the 3-dimensional cutting force and the rigidity of the work edge. Most distinctive point is that the width of chipping is related to the cutting force on tooth face. The authors thought that it can be controlled by an angle of helical endmill, so the authors developed the left twisted endmill, which has high helical angle. It can decrease about 70% of the width of edge chipping.
公益社団法人精密工学会の論文
1993-11-05