Material side tracing and curve refinement for pencil-cut machining of complex polyhedral models

Authors:
Yongfu Ren;Weihang Zhu;Yuan-Shin Lee
Affiliations:
Department of Industrial Engineering, North Carolina State University, Raleigh, NC 27695-7906, USA;Department of Industrial Engineering, North Carolina State University, Raleigh, NC 27695-7906, USA;Department of Industrial Engineering, North Carolina State University, Raleigh, NC 27695-7906, USA
Venue:
Computer-Aided Design
Year:
2005

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Abstract

In this paper, a new Material-Side-Tracing method and a pencil-cut curve refinement technique are proposed for 3-axis pencil-cut path generation. Pencil-cut machining has been used to remove remaining material at highly curved regions or corners after the finishing process. Procedures of evaluating and extracting valid pencil-cut points are developed by taking practical cases into account. With the strategy of using material-side information in the tracing process, smooth and clean pencil-cut curves can be generated even if the actual adjacent pencil-cut curves are very close. A technique of pencil-cut curve refinement is presented to overcome the limitation due to the discrete CL-net intervals, and the smooth pencil-cut paths are made complete at sharp corners. Computer implementation and practical examples are also presented in this paper. The proposed techniques can be used in the CAD/CAM systems to generate pencil-cut paths for machining complex polyhedral models.