Corner building method and algorithm of automatic programing for aircraft structural parts

Aimed at the problems of inefficiency, heavy work and unstable quality in corner numerical control (NC) programing for aircraft structural parts, a new auto-extended method based on rounded corner face was put forward. Combined with process knowledge, the processing model of corner is set up, which is the key issue of automatic NC programming. First, some new terms were introduced, such as corner, rounded corner face, processing model of corner and interference region of corner machining. Next, in order to set up a model of corner processing, some methods were proposed which include auto-extended technology, side surface of revolution and cutting element computation methods, and interference region building approach. Based on the above research, an automatic NC programing system of corner was developed, which had been successfully applied in a large aviation manufacturing enterprise. The preliminary application shows that the method is valid for increasing efficiency and quality of corner NC programing, which leads to programing workload reduction.