Toward the Roughing of Sculptured Surfaces from a Regular Cloud of Points (original) (raw)
Sculptured surfaces used in the design and manufacture of molds, dies …etc. are obtained generally in three stages: roughing, semi-finishing and finishing. In recent years, the Reverse Engineering is used in the duplication of objects from physical model or prototype that are defined by a cloud of points which can be regular or irregular. To duplicate an object, two techniques are used: 1) tool path is generated based on the reconstruction of the CAD model, 2) tool path is generated directly without passing by the reconstruction of the CAD model. The first technique is a difficult task and expensive in time. In this paper, for roughing sculptured surfaces defined by 3D regular cloud of points on 3-axis CNC milling machines using flat end mill cutter, a methodology is proposed permitting the automation of this process by firstly generating the Z-map model and the triangles, secondly generation of contours, selection of tool radius and generation of offset contours and finally the too...
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