607 ボールエンドミルの高精度切れ刃生成用NCプログラムの開発(OS1-(2) 計算力学と数値シミュレーション,オーガナイズドセッション)

概要

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The purpose of this research is to develop NC-program to generate highly precise cutting edge of ball end mill by improving existent NC-program. The cutting edge of ball end mill is generated as an intersection of two surfaces, R-gash and R-2. Two curved surfaces that are defined as enveloped surface of grinding wheel is calculated. We confirm that accuracy of the cutting edge which is decided depending on distance of this intersection and virtual sphere of specidied radius is about 10μm with NC-program of a one path. Therefore, on the intersection of calculated R-gash and virtual surface of sphere, some dividing points are prepared, the absolute coordinate value of each dividing points is corrected using Steep-descent-method, and this intersection and the intersection of calculated R-2 and virtual surface of sphere are brought close. NC-program of prural lines which computed coordinates after correction which followed the amount of the correction finally calculated and former coordinates is outputted. The accuracy in a simulation improved to about 0.7μm. The result of real grinding shows the accuracy of 2.0μm.
2009-08-25