快速成型中基于零件制造精度的分层算法优化

Hierarchical optimization algorithm based on the accuracy of manufacturing of parts in rapid prototyping manufacturing

在快速成型技术中,以STL模型为基础的分层制造工艺存在台阶效应,台阶效应影响制造零件的尺寸精度和表面粗糙度。为了减小分层制造的台阶效应,讨论了采取较小的分层厚度,从而提高零件的制造精度。讨论了选择合理的分层方向来避免台阶效应,但是为了避免在加工时频繁添加支撑,提出了基于零件装配要求的分层方法。为了避免因分层厚度减小而增加的制造时间,讨论了通过提前对三角形面片进行分类提取,去除一部分冗余三角形面片,从而减少分层时间。提出了将此三者结合即将减小层厚、选择合理分层方向以及三角面片的分类排序结合起以减小快速成型中的台阶效应,提高制造精度,保证制造效率。通过实例进行验证,表明该方法可以有效地减小台阶效应、提高制造精度并且保持其成型效率。

In rapid prototyping,hierarchical manufacturing process based STL model has the effect of step,step effect affects the size precision and surface roughness of the parts. In order to reduce the step effect of layered manufacturing,discusses that reduce the hierarchical thickness,so as to improve the manufacturing precision of parts. In order to avoid increased manufacturing time due to the delamination thickness decreases,and discuss the classification and extraction of triangles in advance,removing a portion of redundant triangles,thereby reducing the time. Puts forward the combination of the two to reduce the step effect in rapid prototyping. Then this method is verified by practical examples,shows that this method can effectively reduce the step effect and maintain its manufacturing efficiency.