复杂曲面宽行加工等参数线刀轨精确搭接方法

等参数线刀轨规划方法广泛应用在复杂曲面的加工中，然而，宽行加工中用传统方法计算刀轨行距不能保证准确性。为避免相邻刀轨之间出现欠切或行宽重叠过多，本文提出了一种行距的预测和调整算法。根据已有刀轨驱动线的位置预测后续刀轨驱动线的位置。构造了刀轨的有效搭接区间，选取能代表刀轨边界的几个特征刀位，通过调整刀轨驱动线的位置使其参数边界落在有效搭接区间内部。有效搭接区间为确定刀轨行距提供了依据，而特征刀位的先取大大减小了刀轨驱动线调整时的计算量。计算实例表明，本文提出的算法可以实现相邻刀轨的精确搭接。

Iso-parametric Tool Path Overlapping Method for Sculptured Surfaces in Wide Strip Machining

The iso-parametric method is widely used for the tool path generation of sculptured surface machining. Traditional methods for calculating path intervals can't ensure accuracy in wide strip machining. A path interval prediction and adjustment method is developed to avoid undercut or excessive overlap between adjacent tool paths. With this method, the subsequent tool path driving lines can be predicted from the existing tool paths. Then, effective overlap interval is constructed, and several characteristic tool positions are selected to represent the whole path. Finally, the driving line is adjusted until the machining verge of the selected tool positions fall in the effective overlap interval. The effective overlap interval provides basis for defining path interval, and the calculation burden of adjusting the driving line is greatly reduced by selecting the characteristic tool positions. A calculation example shows that the proposed method can achieve accurate overlap between adjacent tool paths.