Pc-based Open Architecture Cnc System Realization

With the development and broad used of CNC technology and complex curves, open CNC system base on PC has been used in machine, electron, computer, autocontrol, inspect device etc. The research purpose of open CNC system is to build a modular, reconfigurable and expandable architecture of CNC systems to improve the system's flexibility, and enable the systems to be re-developed. As a result, CNC systems can be responsive to the market quickly and economically.While the development of international open CNC projects, more attention is paid to open CNC systems at home. But relative researches are still at the stage of beginning and are non-systematical. In this thesis, some key aspects and technology on the design of open architecture CNC systems are researched, including system architecture analysis, open hardware structure design, driver developing, curve interpolation technology in motion control, etc. Following are the main works and results:For concept design, some basic aspects about open CNC systems are investigated, including the importance of architecture to CNC system capabilities and development, the features and drawbacks of current architecture, and why and how for CNC systems to be open. Some principles and a concept model for open architecture systems are proposed which can be used as the guidance of detailed design of the software and hardware.To meet the requirements of open characteristics of CNC systems, the design principles of open system hardware are investigated. Based on the bus selection and the division of system hardware, a distributed modular CNC system hardware structure with field-bus is proposed. Design methods of the modular system and its function modules base on CAN-bus and PCI-bus are presented in details.The adoption of advanced PCI bus makes the open CNC system connect with the PC, and this thesis develops the WDM driver based on Windows2000.This thesis studies the curve interpolator technology of open CNC systems.