NC milling error assessment and tool path correction

Authors:
Yunching Huang;James H. Oliver
Affiliations:
Iowa Center for Emerging Manufacturing Technology, Department of Mechanical Engineering, Iowa State University, Ames, IA and 6 Chung-Hsing Street, Hsin-Chuang, Taipei, Taiwan 24209, R.O.C.;Iowa Center for Emerging Manufacturing Technology, Department of Mechanical Engineering, Iowa State University, Ames, IA and 2078 Black Engineering Building, Ames, Iowa
Venue:
SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
Year:
1994

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Abstract

A system of algorithms is presented for material removal simulation, dimensional error assessment and automated correction of five-axis numerically controlled (NC) milling tool paths. The methods are based on a spatial partitioning technique which incorporates incremental proximity calculations between milled and design surfaces. Hence, in addition to real-time animated five-axis milling simulation, milling errors are measured and displayed simultaneously. Using intermediate error assessment results, a reduction of intersection volume algorithm is developed to eliminate gouges on the workpiece via tool path correction. Finally, the view dependency typical of previous spatial partitioning-based NC simulation methods is overcome by a contour display technique which generates parallel planar contours to represent the workpiece, thus enabling dynamic viewing transformations without reconstruction of the entire data structure.