一种非均匀自适应分层方法

自适应分层考虑了CAD模型在零件制作方向上的曲率变化,采用变层厚分层以提高零件的表面精度,一般的自适应分层方法对整个零件采取相同的表面精度要求(尖顶高度)。然而在实际应用中,零件的某些重要表面要求光滑一些,而其余相对不太重要的表面可以粗糙一些,即零件的不同表面具有不同的表面精度要求。通过对零件的不同表面采用不同的尖顶高度误差,可以进一步提高自适应分层的效率和零件的表面质量。提出一种非均匀自适应分层方法,用户选择好零件的制作方向后对零件的不同表面输入不同的表面精度要求,然后系统自动进行非均匀自适应分层,分层结果以SLC文件格式输出并可以直接送到各种快速成型系统进行加工。最后给出了分层实例并对结果进行了分析。

An Approach of Adaptive Slicing with Non-uniform Cusp Heights for Rapid Prototyping

Adaptive slicing varies the layer thickness to take into account the curvature of the surface of the CAD model in the build direction to improve surface finish.Most adaptive slicing implementations assume a maximum allowable cusp height which applies to the entire part.However,most parts do not have uniform cusp height requirements.Some faces are required to be smooth while other faces are relatively unimportant.With non-uniform cusp height specifications,it is possible to improve adaptive slicing efficiency and part quality further.This paper presents an approach of adaptive slicing with non-uniform cusp height requirements.First,user selects build direction for the part and specifies different cusp height requirements for different surfaces;then the slicing software detects and deals with different geometric feature of the part;last,the system slices the part automatically and exports the slicing result by SLC file which can be sent to most rapid prototyping systems for fabrication directly.Implementation details and results are presented.