Roughing Algorithm for Sculptured Surface Cavity Machining by Using Spiral Tool Paths

• Main Authors: Huang，Geng Woei, 黃競褘
• Other Authors: Chang，Ien Phong；Tsai，Men Dar
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/69299441379920179836

碩士 === 中原大學 === 機械工程研究所 === 81 === The complexities of sculptured surfaces often make machining difficult and inefficient. Spiral-out pocket machining is considered the most efficient roughing method. However, the radial depth of cut varies with the geometry shape of the tool path during spiral-out pocketing. This variance may cause chatter or excess tool deflection problems. We have developed calculation methods of the actual radial depth of cut for circular tool paths. However, for applying these methods to cavity machining of sculptured surface, the pocket boundaries of free-form curves should be approximated with circular arcs. Besides, the error should be located on the pocket side of the approximated curve. In this thesis, we use the circlar arcs which have centers located on the isometric line of two end points of a curve element to approximate the curve. Then, based on the Voronoi diagram we develop NC programming subroutines for cavity roughing.