摘要
现有的自适应分层方法,通常对整个零件采用同一个最大的尖顶高度要求,实际上,大多数零件由于表面的重要程度不同,而需要不同的尖顶高度要求。对零件的不同表面采用不同的尖顶高度要求,可以进一步提高自适应分层的效率。为此,提出了一种在CAD系统外直接对STEP标准CAD模型进行非均匀自适应分层的方法,CAD系统与分层系统之间的数据交换采用STEP中性文件的格式。选择好零件的制作方向后,用户可根据零件表面的重要程度指定不同的尖顶高度要求,然后系统自动对CAD模型进行自适应分层。最后给出了分层实例,并对结果进行分析。
Most adaptive slicing approaches use a maximum allowable cusp height for the entire part. In practice, however, some important faces of a part are required to be smooth while other unimportant faces can be rough. With non-uniform cusp height specifications, the high adaptive slicing efficiency can be gained. A STEP-based approach of adaptive slicing with non-uniform cusp heights for rapid prototyping is presented. Geometry model of a part is transferred from a CAD system to our slicing software by the STEP standard format. After the building direction of a part is selected, the user is prompted to specify different allowable cusp heights for different surfaces of the part. Then the CAD model is sliced adaptively and the sliced model is exported by SLC format. In the end, an instance is demonstrated and the results are given.
关键词
自适应分层
直接分层
快速成型
adaptive slicing
direct slicing
rapid prototyping
