Generation of Surface Finishing Paths and Integration of Surface Topography for Surface Finishing of Molds and Dies

• Main Authors: Chen, Ching-Fang, 陳慶芳
• Other Authors: Chao-Chang A.Chen
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/37447170345205357730

碩士 === 淡江大學 === 機械工程學系 === 84 === This study presents the generation of fractal tool paths and the integration of surface topography for surface finishing of molds and dies. A machining center and a scanning probe, and an electrical grinder were used to construct an automated surface finishing system as a platform to identify the developed methods. In this research, a fractal pattern based on Hilbert curves is calculated first to generate the fractal paths, then the fractal pattern is transformed to 3-D B-spline surfaces to generate 3-D fractal tool paths which have "equi-directional distribution" property. The density distribution of fractal tool paths can be controlled by the order of fractal patterns, so the functions of surface roughness parameters can be obtained by considering the parameters of the order of fractal patterns, intervals of fractal tool paths, tool radius and related surface curvature radius. In the automated surface finishing system, the surface data obtained from the scanning probe are combined and compared with the CAD geometric data base for calculating the form error. The desired form error reduction is used as an input to the developed surface roughness functions for generating the fractal tool path commands for surface finishing. Furthermore, the fractal tool path commands were converted to the NC part programs for driving the grinder to reduce the form error. Several experiments were performed on the automated surface finishing system. Experimental results were shown the feasibility of the developed functions and generations of fractal paths for surface finishing processes.