NC加工命令の高速な生成手法 : 逆オフセット法のハードウェアによる高速化

概要

論文の詳細を見る
Molds and dies with complex shapes are usually fabricated using numerically controlled (NC) 3-axis milling machines with a spherical cutter. Most CAM systems compute the cutter path based on the geometric model of designed surfaces. In order to avoid gouging problems in the milling process, a tool reference surface representing the offset shape of the designed surface is computed prior to the path generation. This surface corresponds to the upper portion of the swept volume of the inversc cutter moving around the surface. In this paper, the authors propose an acceleration method of this inverse offset computation 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 component surfaces of the swept volurne. Some portions of the component surfaces do not contribute the result shape of the tool reference suface. Our algorithm reduces the number of polygons (and computation time) by properly excluding such surface portions from the tessellation. An experimental program is implemented and some tool reference surfaces for milling complex mold shapes are computed.
公益社団法人精密工学会の論文
2000-12-05