关键词: 逆向工程, 快速成形, STL文件, Clothoid曲线, 层面轮廓重构, 自适应分层, 熔融沉积成形

Abstract: To overcome the inherent defect in precision loss for STL gridding files, a series of precise adaptive slice algorithms based on STereo Lithography interface specification (STL) files were proposed. Proceed from improving siling contour curve precision and considering the subsequent interpolation adaptability by CNC manufacturing, a curve profile was reconstructed and fitting processing data pionts was obtained by using Clothoid curve fitting algorithm with curvature continuous properties. In adaptive slicing, the slicing thickness was determined by tangent angle in vertical contour curve, and the slicing accuracy as well as the efficiency were improved effectively. These methods were validated by Fused Deposition Modeling (FDM) system processing. The results showed that the method not only reduced the intrinsic error of original STL files, but also improved the processing surface quality and efficiency of rapid prototyping parts.

Key words: reverse engineering, rapid prototyping, stereo lithography interface specification file, Clothoid curve, contour curve reconstruction, adaptive slice, fused deposition modeling