测量点数据等残留高度刀具路径规划

在介绍计算几何模型的基础上,提出一种刀具路径算法.首先分别以刀具半径值和残留高度值为等距距离,通过等距计算求出等距点集和残留高度点集;然后以前一行刀具路径为中心构建刀具包络面,并求出刀具包络面与残留高度点集的交点,即过渡点集;最后通过求以过渡点集为中心的刀具包络面与等距点集的交点,得出相邻行刀具轨迹,依次递推,求出所有的刀具路径行.针对计算过程中可能出现的欠切问题,给出了应用密切圆追踪的边界处理方法.通过实例验证了该算法的可行性.与等间距刀具路径生成方法进行比较表明,应用文中算法解决针对测量点数据的数控加工刀具路径生成问题,可缩短刀具路径长度,提高加工效率.

Constant Scallop-Height Tool Path Planning from Measured Data

A tool path planning method is proposed based on geometric models of constant scallop-height tool path. To get the offset point-set and scallop point-set, the measured data are offset with tool radius and scallop-height respectively at first. Then the tool envelope surface is constructed using the last tool-path as the center curve, and the transition point-set is acquired by calculating the intersection of the tool envelope surface and the scallop point-set. Subsequently the tool envelope surface is again constructed using the transition point-set as the center curve, and the adjacent tool-path is acquired by calculating the intersection of the tool envelope surface and the offset point-set. All tool paths can be determined by repeating the above steps. Finally the validity of the presented method is demonstrated with two examples. The calculation results are compared with those of iso-planar machining. The results indicate that the path-length is shorter, and the machining efficiency can be enhanced greatly.