光固化快速成型中零件制作方向的多目标优化问题研究

Multi-Objective Optimization of the Part Building Orientation in Stereolithography

阐述了快速成型中与制作方向相关的质量与经济性问题 ,对制作方向的优化目标进行了定义 ,并依据该目标建立了制作方向多目标优化模型 .针对悬臂变形、台阶效应、过固化及制作时间 ,分别构造了子目标函数 ,利用评价函数法 ,把制作方向优化的多个目标函数转化为一个数值目标的评价函数 ,并给出了优化模型的约束函数 .最后 ,以该优化模型作为计算的理论依据 ,进行了应用实例的方向优化 .计算结果表明 :该模型准确地表达了快速成型中的制作方向优化问题 ,理论正确 ,方法可行 .

The quality and cost related to the part building orientation are discussed and an optimization objective of the building orientation is defined. Considering the cantilever deformation, step-effect, over-curing and building time, the sub-objective functions are constructed. Using evaluation function, the multi-objective function is converted into an evaluation function with single objective and the constraint function of optimization model is formulated. Using this optimization model as the theoretical basis in computation, the orientation optimization of a practical case was done. The results show that this model correctly represents the building-orientation optimization in stereolithography process, and the method is feasible.