Study of internal corner transition of vector synthesis interpolation for cone spline

Internal corner transition algorithm for cone spline NC machining based on vector synthesis interpolation is proposed: The curve´s coordinate value in reestablished relative coordinate system is figured out by recursive calculation of the difference value of the curve´s start end; In order to obtain the equidistant curve of conic curve, which is the track of cutter location point, a normal vector circle is created. After that, the equidistant curve of conic curve is established based on vector synthesizing of the normal vector circle and cone spline. The feeding of cutter location point is controlled by the vector synthesis interpolation; Reverse interpolation parameters are read-ahead and calculated, and the transition algorithm of internal corner is designed to solve the transition problem when processing. Experiments show that the algorithm is robust, efficient, and meets the requirements of engineering application.