三次元CADを活用したボールエンドミルによる傾斜面加工における切削性能評価に関する研究（切削機構および切削特性に基づく高能率・高精度加工法の提案）

概要

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In this paper, the cutting mechanism and the cutting performance of a ball end mill for an inclined surface with spindle inclination by a contour path method are evaluated. In addition, a highly efficient and highly accurate cutting method is proposed. Ball end mills are used to produce many items, including molds and dies. However, the cutting process of ball end mills is very complex, so the highly efficient and highly accurate cutting method is not clear. Therefore, in this study, at first the modeling of a ball end mill and a workpiece with an inclined surface are carried out using 3D-CAD. Secondly, the cutting cross-sectional area is calculated by the interference of the rake surface and the uncut chip volume which will be removed by one cutting operation. And also, the evaluation value Ed corresponding to the cutting torque is defined and calculated. Then the influence of the cutting method and the workpiece and the spindle inclination angles on the maximum cutting cross-sectional area and the maximum evaluation value are shown. Thirdly, the conditions which expect good cutting performance with small evaluation values and including the cutting with the bottom edge of a ball end mill are picked out, and experiments are carried out under these conditions. Finally, cutting conditions which yield the good cutting performance are shown using the analytical and experimental results.