球面のボールエンドミル加工における加工面創成機構の理論解析(第3報) : 加工面形状の工具姿勢角依存性

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The objective of this study is to clarify the optimum direction of tool revolving axis where the machining error of the surface geometrically becomes the minimum in 5-axis machining. This paper describes the dependence which is derived from geometric data of machined surface and position of cutting edge. The shape of machined surface is defined by the trajectory of spiral cutting edge, and calculated with 785 orientations. The dependence is analysed from the following view points : (1) Optimizing direction of tool revolving axis,(2) Classification of boudarics of unit machined region,(3) Optimizing twisted angle of spiral cutting edge. As useful results of this report,(1) both the best and the worst orientation were found at very small tilting angles. In the worst case, the trajectory of cutting edge generates the complicated surface, because of the stationary point of velocity along feed direction which locates inside of the machined region rather than outside in the best case.(2) Symmetric boundaries were observed at symmetric axis direction. Boundary of the worst case was complicated, too.(3) Effect of twisted angle is shown periodically.
社団法人精密工学会の論文
2003-03-05