斜面のボールエンドミル加エにおける工具挙動と仕上げ面生成機構の解析（第2報）: 工具のたわみに基づく仕上げ面性状と加工誤差の検討

摘要

生産設備を有効利用してより高精度，高能率な金型加工をrn行なうためには，その主要工具であるボールエンドミルの加工rn時における工具挙動や仕上げ面性状，加工誤差を的確に把握し，rn最も有効な加工条件，工具経路，工具姿勢等を事前に検討できrnるようにすることが望まれる．%In the 1st part of this investigation, the analysis of tool deflection and locus of tool axis during ball end milling along a contour line was presented. In the paper, cutting force data predicted by using the cutting model proposed in a previous paper and the Finite Element Method were used for analyzing the deformation of a tool. In this paper, tool deflection in the milling of an inclined surface is measured under various slopes of the surface and compared with the predicted results. The predicted results agree with the measured results well enough. Geometrical configurations of the machined surface and the machining errors obtained from the analysis are shown for various slopes of the inclined surface. It is found that machining errors disagree with the magnitudes of deflection of the tool axis in a plane normal to the feed direction, so the errors can't be evaluated by neglecting the condition of cutting edge engaged with the workpiece such as rotational angle and tool geometry. The machining error caused by tool deflection becomes small for milling of an inclined surface where the left side of the feed direction is higher.