摘要
CAD模型分层是快速成形技术的最重要环节,而层片厚度计算是CAD模型分层的关键问题。在分析顶尖高度法和相邻截面面积变化率法两种典型的层片厚度计算方法原理的基础上,根据光滑曲线可由其上切线包络的原理,提出了一种基于定长切线的层片厚度计算方法,解决了顶尖高度法层厚计算公式太多,曲率半径ρ计算较困难,而相邻截面面积变化率法计算截面面积精度要求高,且难以找到最佳层厚的问题。根据定长切线层片厚度计算方法,给出了一种自适应分层的新方法,并通过两个实例对该自适应分层算法进行了验证,证明了算法的正确性和可行性。
Slicing of a CAD model is one of the most important part of rapid prototyping process and the calculation of layer thickness is vital for slicing. In rapid prototyping, there are two typical approaches to the calculation of layer thickness： cusp height and varying rate of the areas of adjacent sections. On the basis of analysing their advantages and drawbacks, a calculation algorithm of fixed-length tangent based on layered thickness is proposed, which overcomes some deficiencies of the above-mentioned two typical approaches. It is proved that this algorithm is more feasible and convenient than the two typical approaches and it reduces the complexity of computation. Two examples are also presented.
出处
《机械科学与技术》
CSCD
北大核心
2009年第3期326-329,共4页
Mechanical Science and Technology for Aerospace Engineering
关键词
CAD模型
层片厚度
定长切线
自适应分层
CAD model
layered thickness
fixed-length tangent
adaptive slicing
