High-speed Wire Edm Wire Cutting Cnc Technology

The Wire Electric Discharge Machining (WEDM) shows a relatively small cutting force compared to traditional machining, so it is suitable for the machining of parts with complex shapes, high precision and hardness. It plays an important role in mould industry, tool industry, and special machining field et al. Wire electric discharge machining with high travelling speed (WEDM-HS) machine tools are widely used in China. By decades of developments, it has reached a mature level. However, the NC part, which is the core module of the WEDM-HS needs to be improved. Because the performance of NC will direct affect the machining precision and stability, and it also decides the application scopes and machining ability of complex parts, much attention should be paid on it. When the Open Architecture Numerical Control is becoming the future of the numerical control technology, the numerical control system for WEDM should follow the stream. So it has important significance to build an Open Architecture Numerical Control system of WEDM.From this point of view, this paper discusses the numerical control system for WEDM-HS. The construct mode of OANC system adopted in the research is "PC plus Motion Control Board", and the soft and hard structure of this system have been designed and analyzed. The research on numerical control system includes three parts:First, the software of the system has been studied, including generating process drawing according to the machining code (3B), data processing, simulation of machining process, communication with hardware and other assistant functions of numerical control etc.Second, selecting AVR microprocessor as the core of Motion Control Board and studying the relevant application technology, mainly consists of the methods to expand microprocessor exterior data memorizer, realizing the exchange of several kinds RAM CMOS chips without change the circuit board, some techniques how the microprocessor drives the numerical controlled worktable and how to control step motor to accelerate and decelerate etc.At last, how to use CPLD to realize the data transmission through ISA bus between PC and microprocessor is investigated. A control board circuit to supply a hardware foundation for the total numerical control system is designed with anti-jamming measures improving the stability of the system.