Recent developments of rapid prototyping and manufaturing (RP&M)technology are discussed. To facilitate application of RP&M technology as an enabling technology in product development and manufacturing, our ce...Recent developments of rapid prototyping and manufaturing (RP&M)technology are discussed. To facilitate application of RP&M technology as an enabling technology in product development and manufacturing, our center has done a series of pojects covering RP theory (modern shaping science), new RP processes and equipment,rapid tooling technology and rapid product development systems. With the STEP protocol and product modeling technology, RP&M technology can be integrated into CIMS to form a new subsystem, the free form manufacturing subsystem. The subsystem architecture is investigated in this paper.展开更多
This paper presents a robust algorithm to generate support for fused deposition modeling (FDM). Since many flaws appear in most stereo lithography (STL) models, this algorithm utilizes slice data as input. A top-down ...This paper presents a robust algorithm to generate support for fused deposition modeling (FDM). Since many flaws appear in most stereo lithography (STL) models, this algorithm utilizes slice data as input. A top-down approach was used to calculate the support slice layer by layer. The generation algorithm was described in detail including the slice grouping, oriental bounding box (OBB) calculation, offsetting, and Boolean operations. Several cases are given to validate the efficiency and robustness of the procedure. The algorithm provides necessary support not only for hanging surface but also for hanging vertexes and edges with O(n) time complexity, where n is the number of layers. The algorithm fully utilizes the parts’ self-support ability and reduces support volume to the maximum extent. This slice data based algorithm has the same efficiency as the STL based algorithm but is more stable, which significantly enhances the robustness of the support generation process.展开更多
文摘Recent developments of rapid prototyping and manufaturing (RP&M)technology are discussed. To facilitate application of RP&M technology as an enabling technology in product development and manufacturing, our center has done a series of pojects covering RP theory (modern shaping science), new RP processes and equipment,rapid tooling technology and rapid product development systems. With the STEP protocol and product modeling technology, RP&M technology can be integrated into CIMS to form a new subsystem, the free form manufacturing subsystem. The subsystem architecture is investigated in this paper.
基金Supported by the Natural Science Fund Project of Hubei Province of China (2004ABC001)
文摘This paper presents a robust algorithm to generate support for fused deposition modeling (FDM). Since many flaws appear in most stereo lithography (STL) models, this algorithm utilizes slice data as input. A top-down approach was used to calculate the support slice layer by layer. The generation algorithm was described in detail including the slice grouping, oriental bounding box (OBB) calculation, offsetting, and Boolean operations. Several cases are given to validate the efficiency and robustness of the procedure. The algorithm provides necessary support not only for hanging surface but also for hanging vertexes and edges with O(n) time complexity, where n is the number of layers. The algorithm fully utilizes the parts’ self-support ability and reduces support volume to the maximum extent. This slice data based algorithm has the same efficiency as the STL based algorithm but is more stable, which significantly enhances the robustness of the support generation process.
