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.