Development Of A Engraving CNC System Based On DSP

The CNC system is the critical part of CNC engraving machines. The quality and efficiency of engraving process mainly depend on the functions and performance of CNC systems. A good CNC system is important to the price and the market of engraving machine. From the current state of homeland engraving machines and aiming at the requirements of users, this thesis introduces a new type CNC system for engraving machines based on DSP. The type of CNC system can improve the performance of machine with lower price and the competing of market of engraving machines, which provides a way to reform the engraving quality, to improve the efficiency and to save the cost of process. From the investigation of the market of engraving machines, the architecture of hardware and software of the CNC system is planned according to the required functions and performance of the CNC system. In the system, a 32-bits fixed point of DSP TMS320F2812 is used as CPU, a CPLD is used for peripheral I/Os and the extension of memory and a MCU is used to implement the man-machine interface, which results the system with good control performance, lower cost, good flexibility, and higher reliability. Using C language assisted with assembly language programs the system's software. Assembly language is used to complete real-time control tasks, and C language can be used to construct the frame of software and complete those unreal-time control tasks, which can not only improve the efficiency of programming and the maintenance of the program, but also provide the system with good real-time performance. In addition, the comparative integral interpolator assisted with good accelerating and decelerating algorithm is used for the speed requirement of engraving machines. As the result, the developed prototype of the CNC system can wok with the anticipated functions and performance.