快速成形定层厚自适应切片研究

Reasearch on Adaptively Slicing the Unchangeable Thick Layer in Rapid Prototyping

由于切片层有一定厚度，台阶效应和小特征遗失等是快速成形技术重要尺寸误差源。针对ＬＯＭ型快速成形中切片层厚度不变的特点，提出三种提高其制件精度的方法。一利用切片轮廓线段对应三角形的法矢在Ｚ轴投影方向选择切片位置，减小台阶误差，二通过比较切片层上表面Ｓｉ＋１，中间截面Ｓｉ＋０．５和下表面Ｓｉ的轮廓环数，正确选择切片位置，减小小特征遗失引起的误差，三有选择地制作与加工面平行的表平面。

The step effect and small feature loss are important size error resources in Rapid Prototyping. Three methods are advanced to reduce the size errors of step effect and small feature loss when the unchangeable thick layer is cutting in Laminated Object Manufacturing.