斜面のボールエンドミル加工の切削抵抗と切削機構の解析（第２報）

－工具が上昇および下降する切削過程の計算結果と実験結果との比較検討－

抄録

In the 1st part of this investigation, a cutting model taking account of the condition of side-curl of the chip proposed in previous paper has been extended to milling process in which both cutting edges of the sphere and cylindrical portions engage with the workpiece. Geometric quantities such as contact region between the cutting edge and the workpiece surface, undeformed chip thickness along the cutting edge and area of cutting cross-section in upward or downward milling of inclined surface has been analyzed. In this paper, the cutting forces and chip formation in above upward or downward milling for various inclined surfaces are predicted by using the cutting model and energy method. Three components of the cutting force are measured by a piezo-electric type dynamometer and compared with those obtained through theoretical prediction. The predicted results are good agreement with the experimental results. From the comparison of chip form described by using the predicted value of chip flow angle and radius of side-curl of the chip and chip form obtained experimentally for various inclined surfaces, it is shown that transition of the chip form with inclination angle of the warkpiece surface can be analytically obtained.