PART BUILDING ORIENTATION OPTIMIZATION METHOD IN STEREOLITHOGRAPHY  

作　　者：HONG Jun WANG Wei TANG Yiping 

机构地区：[1]State Key Lab for Manufacturing System Engineering, Xi＇ an Jiaotong University, Xi＇ an 710049, China [2]College of Missile,PLA Air Force Engineering University, Sanyuan 713800, China [3]State Key Lab for Manufacturing System Engineering, Xi＇ an Jiaotong University, Xi＇ an 710049. China

出　　处：《Chinese Journal of Mechanical Engineering》2006年第1期14-18,共5页中国机械工程学报（英文版）

基　　金：This project is supported by National Hi-tech Research and Development Program of China(863 Program, No.2005AA414020).

摘　　要：Aiming at the part quality and building time problems in stereolithography （SL） caused by unreasonable building orientation, a part building orientation decision method in SL rapid prototyping （RP） is carried out. Bringing into full consideration of the deformation, stair-stepping effect, overcure effect and building time related to the part fabrication orientation, and using evaluation function method, a multi-objective optimization model for the building orientation is defined. According to the difference in the angles between normal vectors of triangular facets in standard triangulation language （STL） model and z axis, the expressions of deformation area, stair-stepping area, overcure area are established. According to the characteristics in SL process, part building time is divided into four sections, that is, hatching scanning time, outline scanning time, support building time and layer waiting time. Expressions of each building time section are given. Considering the features of this optimization model, genetic algorithm （GA） is used to derive the optimization objective, related software is developed and optimization results are tested through experiments. Application shows that this method can effectively solve the quality and efficiency troubles caused by unreasonable part building orientation, an automatic orientation-determining program is developed and verified through test.Aiming at the part quality and building time problems in stereolithography （SL） caused by unreasonable building orientation, a part building orientation decision method in SL rapid prototyping （RP） is carried out. Bringing into full consideration of the deformation, stair-stepping effect, overcure effect and building time related to the part fabrication orientation, and using evaluation function method, a multi-objective optimization model for the building orientation is defined. According to the difference in the angles between normal vectors of triangular facets in standard triangulation language （STL） model and z axis, the expressions of deformation area, stair-stepping area, overcure area are established. According to the characteristics in SL process, part building time is divided into four sections, that is, hatching scanning time, outline scanning time, support building time and layer waiting time. Expressions of each building time section are given. Considering the features of this optimization model, genetic algorithm （GA） is used to derive the optimization objective, related software is developed and optimization results are tested through experiments. Application shows that this method can effectively solve the quality and efficiency troubles caused by unreasonable part building orientation, an automatic orientation-determining program is developed and verified through test.

关 键 词：Stereolithography （SL） Rapid prototyping （RP） Orientation optimization Genetic algorithm （GA） 

分 类 号：TH16[机械工程—机械制造及自动化]