Abstract:In order to improve the efficiency of gear machining, an automatic parametric programming system based on gear hobbing is presented in this paper. The mathematical model of the gear hobbing processing was established. The core of the method is inputting certain parameters like workpiece, hob cutter and process parameters through human-machine interface, which automatically generates NC code of gear hobbing by parameter processing module in support of the operation and processing database. The design of human-machine interface, arithmetic, and functional module was realized by custom macro program based on GSK 218MC CNC system. The application in machine tools validates high programming efficiency, high manufacturing accuracy and reliability of the arithmetic, improving the utilization efficiency of the hobbing machine and decreasing the professional technical threshold for operators, but also promoting the market competitive power of the national produced gear hobbing CNC system.