Determining Setup Orientations From the Visibility of Slice Geometry for Rapid Computer Numerically Controlled Machining

Author:

Frank Matthew C.1,Wysk Richard A.2,Joshi Sanjay B.2

Affiliation:

1. Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA 50011

2. Department of Industrial and Manufacturing Engineering, Penn State University, University Park, PA 16802

Abstract

A method for rapid computer numerically controlled (CNC) machining is being developed in an effort to automatically create functional prototypes and parts in a wide array of materials. The method uses a plurality of simple two-and-a-half-dimensional (212-D) toolpaths from various orientations about an axis of rotation in order to machine the entire surface of a part without refixturing. It is our goal to automatically create these toolpaths for machining and eliminate the complex planning traditionally associated with CNC machining. In this paper, we consider a problem that arises in automating this process—visibility to the surface of a model that is rotated about a fourth axis. Our approach involves slicing the computer-aided design (CAD) model orthogonal to the axis of rotation. The slice geometry is used to calculate two-dimensional visibility maps for the set of polygons on each slice plane. The visibility data provides critical information for determining the minimum number and orientation of 212-D toolpaths required to machine the entire surface of a part.

Publisher

ASME International

Subject

Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering

Reference36 articles.

1. Wang, F. C., Marchetti, L., and Wright, P. K., 1999, “Rapid Prototyping Using Machining,” SME Technical Paper, PE99-118.

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