Research Of Open CNC System Based On PC

Modern manufacturing technique is developing toward high speed, high precision,flexibility,intelligence and integration.However,the traditional NC is hard to meet the special needs of users and of the second development.The new NC——open CNC system based on PC just adapts to the need.The adoption of numerical control system on the current analysis, put forward a numerical control According to the analysis of current numerical control system,the inevitability of numerical control system developing toward open CNC architecture is raised.First of all,the definition,characteristics and design principles of open CNC system are described.Then the three kinds of architectures of current open CNC system are analyzed,including PC embedded in NC architecture,NC embedded in PC architecture and all software-based architecture.After that,the new architecture of both software and hardware of open CNC system based on PC is put forward.The architecture is based on IPC and motion controller.TMS320F2812 DSP and C8051F040 MCU are used in motion controller as a central processing unit.The SPI bus is used for the communication of instructions and data processing among processors,the CAN bus is used for the communication of instructions and data processing between motion controller and PC.The transfer mode of CAN bus and the SPI bus is also described.Through the use of economical,practical and "soft" real-time method,the real-time control, display and three-dimensional simulation system are achieved in the multi-tasking Windows XP operating system platforms.In present,a CNC milling machine and a CNC lathe have been designed,using the numerical control system,test results show that PC-based open CNC system of this architecture meets the needs of the actual processing,and has practical value.