The Research And Development Of Open Architechture Numerical Control System Based On PC

The computerized numerical control (CNC) is the basis of advanced manufacture technology. In past, most numerical systems were used specially. When they were finalized the design,it was not easy to update. In the view of the strong function and opening character of today' s PC, a new ero numerical control system based on PC is the trend of development of CNC system.Through the research of open architecture numerical control system(ONC) at home and abroad, this thesis analysis and contrasts several open modes and system structures of several ONC. An PC+ Motion Control Card based on ONC is proposed. At the same time, this thesis systematically studies and develops the motion control card.According to the structure designing method, the complex motion control card system is broken down into the sub-system which is functionally independent, and the hardware circuit is designed for each sub-system. In this process, the thesis discusses detailedly the method which canImprove the resolving power in measuring component and can deal with the probe circuit, and puts forward the design method of applied circuit. Then the thesis discusses the methods of line and circle interpretation. Based on the methods of hardware circuit and line ro circle interpretation, a software layered idea is proposed. In this section, the thesis discusses detailedly the realization routing which managers the bottom hardware using the Virtualdevice driver on the flat of Win95/98/2000. By this way, some probrem , such as time interpretation and data sampling, can be settled in the CNC sytem of Win32. Then function library based above ways is presented to provide to third party use. The thesis also discuss the communication method on the host and slave machine. Finally, some probrem .which should be payed attention to when hardware designing are already analysed in view of hardware anti-disturbance. Accordingly, the whole motion control system is completed. Meanwhile, using Protel , VC++ and DriverStudio developing envirement, the developed motion control card has been debugged.