关键词: 计算机辅助设计, 快速成型, 自适应直接切片

Abstract: The part model could be sliced directly with the adaptive direct slicing function provided by Rapid Prototyping(RP) oriented universal interface of CAD Packages, subsequently, RP interfacing file consisted of sheet solid datasets could be created. The contours of sheet solid about each layer were reconstructed accurately with Non Uniform Rational B-Spline(NURBS) curve. According to the reconstructed NURBS segments of each section, the raster filling paths of RP apparatus were created accurately by the automatic filling function of the interface along the X and Y directions. The following facts are confirmed by the experiment data ：compared with the polyline contours of sliced Stereolithography(STL) model, the approximation error between the adaptive direct slicing contours reconstructed by NURBS and the original contours could be decreased about to 2%; however the number of required NURBS curves could be reduced about to 22% by contrast with the number of polylines of section contour about STL model.

Key words: CAD, rapid prototyping, adaptive direct slicing