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Proceedings of CAD'17, 2017, 165-169
Fast Computation of Accessibility Cones for Assisting Process Planning of 3+2 Axis Milling

Masatomo Inui, Shinji Nagano, Nobuyuki Umezu, Ibaraki University

Abstract. In the automobile industry, molds with very deep shape are often used for producing large plastic parts, such as instrument panels. In the usual 3-axis milling, cutters with long shank is necessary to avoid collisions between the holder and the mold in the semi-finishing. Since large deformation of the cutter is unavoidable with a long shank, it is difficult to realize the precise and stable machining. To solve this problem, many manufacturers in Japan use 3+2 axis milling for the semi-finishing. In this method, the machine executes a 3-axis milling program with a cutter locked in a tilted position using its 2 rotational axes. In the 3+2 axis milling, shank length can be reduced by properly selecting the cutter posture. Similar advantage can be expected by using a simultaneous 5-axis milling machine, however the cutter in a fixed posture is more rigid so much accurate machining results can be realized.

Keywords. Offsetting, Depth Buffer, Hierarchical Bounding Boxes, GPU

DOI: 10.14733/cadconfP.2017.165-169