关键词: 数控系统, STEP-NC文件, G代码, 刀具路径规划, 制造特征, 铣削加工

Abstract: To apply STEP-NC to traditional Computer Numerical Control (CNC) machines, code conversion technology from STEP-NC-based part programs into G-code for milling application was studied. A tool path planning method oriented to manufacturing feature was proposed. Firstly, manufacturing features were classified, and the tool moving trajectory model was designed for each type of manufacturing feature. Through the pre-treatment, the tool moving trajectory model of manufacturing feature was interpreted as the corresponding CNC system macro program during the G-code conversion. This conversion not only improved the G-code conversion efficiency but also shortened the G-code program length. In addition，STEP-NC information extraction, information processing technology and the automatic conversion process of G-code part programs were also discussed in detail. Finally, the proposed methodology and algorithms were testified and proved by a milling part example.

Key words: computer numerical control system, STEP-NC-based part programs, G-code, tool path planning, manufacturing features, milling