NC加工結果の高速な可視化手法 : 3次元グラフィックス表示装置の利用

概要

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Molds and dies with sculptured surfaces are usually fabricated using numerically controlled (NC) 3-axis milling machines with a spherical cutter. Most CAM systems compute the tool path using the geometric model of designed surfaces in a semi-automatic manner. In order to detect potential problems of the tool path, geometric verifications of the NC milling result are necessary prior to actual machining. Result shape of the workpiece can be computed by subtracting successive tool swept volumes along the path from a solid model representing the stock shape. In this paper, the authors propose an acceleration method of the subtracting operations using the hidden-surface elimination mechanism of the 3-dimensional graphics acceleration hardware. Computation time of the proposed method is basically proportional to the total number of polygons approximating the component surfaces of the swept volumes. Some portions of the component surfaces do not contribute the result shape of the workpiece. Our algorithm reduces the number of polygons by properly excluding such surface portions from the tessellation. An experimental program is implemented and geometric verifications of some sculptured surface milling operations are demonstrated. The program can visualize the complex milling result in a few seconds.
公益社団法人精密工学会の論文
1999-10-05