关键词: 计算机数控, 数据接口, 工艺规划

Abstract: With STEPNC as data interface, CNCs are expected to evolve into autonomous systems. Apart from controlling the machine tools, it is also supposed to deal with a lot of process-related information and make decisions on possible problems during the processs. Based on the STEPNC development and its data model, this paper aims at studying the fundamental technologies of STEPNC controllers. In the first place, STEPNC data model was proposed and analyzed and the interpretation of the processing program into internal data (C++ objects) under STDeveloper environment and the fundamental function calling procedure were introduced. Secondly, the process-related information was categorized into three types and the relevant processing principles in STEPNC controllers were discussed. Furthermore, the determination and optimization model of machining parameters for single working steps (for milling) was presented. Finally, the paper studied and exemplified the basic methods with which the assistant operations can be specified and embedded between the working steps to form the whole process planning.

Key words: CNC, data interface, process planning