The research on the algorithm of inner and outer contours´ distinguishing and the problems of processing domains´ identification

At the present time, the choice of processing domains in CAM softwares used by enterprises is the contour boundary´s hand sorting or the single machined surface´s selection. These ways are low efficiency and error-prone, when they are used in the choice of various domains at one time or the processing domains´ boundaries are complex. According to the need for planning tool path on the mold of tire-sidewall patterns, inner and outer contours and processing domains must be distinguished at first, so an algorithm of inner and outer contours´ distinguishing is proposed which based on the algorithm of ray cross-point. Firstly, the algorithm takes one point from each contour; secondly, the mutual position relationship between contours is obtained by determining the inclusion relation of a point on one contour with other contours; at last, some solution strategies are proposed according to the targeted analysis on the composition of various domains in the practical processing.