Part Decomposing Algorithm Based on STL Solid Model Used in Shape Deposition Manufacturing Process
Shape deposition manufacturing is an innovative rapid prototyping technology by the combination of CNC machining and deposition processes, in which if a surface of the part is visible from the build direction, it can be directly shaped into desired geometry on part material; if the part features are undercut or face away from the build direction, these part features will be sculptured into the support material to form a negative cavity at first, then the part material is deposited into this negative cavity to replicating these features into part material. This process is cyclically repeated until all segments have been built. Finally the sacrificial material is removed, leaving the finished part. This innovative technology has the benefits of commercial rapid prototyping technology; meanwhile it inherits the accuracy and high surface quality of traditional machining process. For realization of this process, its essential to decompose the part to be built into a series of manufacturable segments which have no undercut surfaces from the CAD solid model at the data pretreatment step. In this paper, a solid decomposing strategy is proposed with a detail discuss on the classification of the segments having the so-called undercut face or not based on the value of triangle face normal vector, an algorithm for auto decomposing a CAD solid model in STL data format is developed.
rapid prototyping material deposition CNC machining solid model decomposing STL data format
K. Y. Jiang C. B. Huang B. Liu
College of Mechanical & Automation of Huaqiao University, Quanzhou, Fujian, P.R.China
国际会议
北京
英文
338-345
2008-11-06（万方平台首次上网日期，不代表论文的发表时间）