エンドミルによるスクロール形状部品の高精度・高能率加工法に関する研究 : 第1報,最大切削面積と仕上げ面粗さに基づく高精度・高能率加工法の提案

概要

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This paper deals with the establishment of a high-accuracy and high-efficiency machining method of a scroll-shape workpiece using numerically controlled machine tools. The main results are as follows. (1) The involute curve is described by the approximation using multi-circular elements, and the differences between the two curves are less than 0.2 μ under the dividing angle △ t=0.09 rad and other calculation conditions. (2) The cutter paths for machining the inside and outside surfaces of the scroll-shape workpiece are calculated, and the calculation method of the maximum chip areas based on the coordinate of the cutter centers is shown. (3) Three methods are proposed for machining the inside surface with a constant maximum chip area : (a) the radial depth control method, (b) the feed control method and (c) the spindle revolution control method. Using these methods, a drastic improvement of the machined accuracy, especially in the neighborhood of the center, is expected. (4) For the outside surface, a feed control method is proposed for a constant maximum chip area and a restraint condition of the maximum surface roughness. This method realizes reduction of the machining time to one-half, and large increase of the efficiency can be expected.
1995-03-25