Research On Key Technology Of Embedded CNC System Based On ARM CPU

Numerical Control technology is the core of advanced manufacturing technology, it is also the enable technology in developing the new and top industry. In order to improve the manufacturing in China, the government strengths the support of NC research, moreover the NC machine and NC technology is added one of the 16 grand projects in"the eleventh five years". With the development of embedded technology, China can be the same line of technology research and application with other countries. Work out the special function,high reliability,high competence NC product with embedded CPU and embedded OS, has important meaning in developing our NC. This dissertation which is supported by Shanghai Grand Project, and designs the structure of embedded NC system, and researches some key technology, provides the privacy embedded NC system with certain basic theory and technology.Firstly, based on the analysis of function of embedded NC system soft modules, and researching the requirement of scheduler module, the reliable and stable strategy of scheduler is designed; with the idea of modularize, the interface between scheduler module and other modules is set and finished, all of these make the whole system work efficiently, and provide the reference for the standard interface of embedded NC system.Secondly, based on the analysis of function of motion control card and driver, according to the structure and development step of device drive program deeply under Linux OS, with the idea of modularize, the driver of motion control card based on ARM CPU is developed, which assure the reliable work of embedded motion control card under Linux.Thirdly, based on the widely research of bus communication, and the analysis and compare of various communication protocol, choosing CAN bus as the communication of embedded NC system. Considering the communication requirement of hard real time and mass data, the protocol for up-down communication is designed, and the process of hardware choosing and software developing is narrated. At last, the CAN bus communication is tested from different aspect, for example real-time and reliability, and the machining example is given, the result of test and application example indicate that it is successful to apply CAN bus communication to embedded NC system for the first time in China.Lastly, the conclusion and prospect of research are given, which will provide the future research of embedded NC system a certain reference.