5軸制御切削加工における工具姿勢のグラフィックスハードウェアを用いた高速な決定法 : 被削物のオフセット面と視線群との交差判定を利用した加工可能工具姿勢範囲の導出

概要

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In continuous five axis control machining, determination of tool posture is important process in NC programming. Especially, in fabrication of complicated workpiece, detection and avoidance of collision between cutting tool and workpiece surface are difficult problem. In the conventional studies, planning method of tool posture known as 2D C-Space method has been proposed. In this method, range of machinable posture is described as domain on polar coordinates system. Because estimation of machinable domain on 2D C-Space requires vast amount of geometric calculation for each tool location, an efficient estimation method is required. In this paper, we mention about a new fast calculation method for machinable domain on 2D C-Space. The proposed method is based on simple assumption that the collision can be regard as intersection between line of view and offset surface. We propose a new idea of unique view field, which can change projective method from Cartesian coordinates system to polar coordinates system by one rendering process. Then, we develop a new drawing algorithm of the machinable domain using both the proposed view field and ability of the latest graphics hardware. From performance of the developed prototype system, it is confirmed that the proposed calculation method can attain extraordinary improvement in the estimation time.
公益社団法人精密工学会の論文
2006-08-05