1、外文文献The Numerical Control Engine Bed Transformsnumerical control system development summary brief history and tendency In 1946 the first electronic accounting machine was born in the world, this indicated the humanity created has been possible to strengthen and partially to replace the mental labor
2、the tool. It with the humanity these which in the agriculture, the industry society created only is strengthens the physical labor the tool to compare, got up the quantitive leap, entered the information society for the humanity to lay the foundation. After 6 years, in 1952, computer technology appl
3、ied to the engine bed , the first numerical control engine bed were born in US. From this time on, the traditional engine bed has had the archery target change. Since nearly half century, the numerical control system has experienced two stages and six generation of development. Numerical control (NC
4、) stage (1952 1970) The early computer operating speed is low, was not big to then science computation and the data processing influence, but could not adapt the engine bed real-time control request. The people can not but use numeral logic circuit to build to become an engine bed special purpose co
5、mputer to take the numerical control system, is called the hardware connection numerical control (HARD-WIRED NC), Jian Chengwei numerical control (NC). Along with the primary device development, this stage has had been through repeatedly three generations, namely 1952 first generation of - electron
6、tube; 1959 second generation of - transistor; 1965 third generation - small scale integration electric circuit. Computer numerical control (CNC) stage (in 1970 present) In 1970, the general minicomputer already appeared and the mass production. Thereupon transplants it takes the numerical control sy
7、stem the core part, from this time on entered the computer numerical control (CNC) the stage (which should have computer in front of the general two characters to abbreviate). In 1971, American INTEL Corporation in the world first time the computer two most cores part - logic units and the controlle
8、r, used the large scale integrated circuit technology integration on together the chip, called it the microprocessor (MICROPROCESSOR), also might be called the central processing element (to be called CPU). The microprocessor is applied to 1974 in the numerical control system. This is because minico
9、mputer function too strong, controlled an engine bed ability to have wealthily (therefore once uses in controlling the Taiwan engine bed at that time, called it group control), was inferior to used the microprocessor economy to be reasonable. Moreover then small machine reliability was not ideal. Th
10、e early microprocessor speed and the function although insufficiently are also high, but may solve through the multi-processor structure. Because the microprocessor is the general-purpose calculator core part, therefore still was called the computer numerical control. In 1990, PC machine (personal c
11、omputer, domestic custom had called microcomputer) the performance has developed to the very high stage, may take the numerical control system core part the request. The numerical control system henceforth entered based on the PC stage. In brief, the computer numerical control stage has also experie
12、nced three generations. Namely 1970 fourth generation of - minicomputer; 1974 five dynasties - microprocessor and 1990 sixth generation - (overseas was called PC-BASED) based on PC. Also must point out, although overseas already renamed as the computer numerical control (namely CNC). Also must point
13、 out, although overseas already renamed as the computer numerical control (namely CNC), but our country still the custom called the numerical control (NC). Therefore we daily say numerical control, the materially already was refers to computer numerical control. the numerical control future will dev
14、elop tendency 1 open style continues to, to develop based on the PC sixth generation of direction 2 approaches and the high accuracy development 3 develops to the intellectualized direction (1) applies the adaptive control technology (2) introduces the expert system instruction processing (3) introd
15、uces the breakdown to diagnose the expert system (4) intellectualized numeral servo drive engine bed numerical control transformation necessity From on microscopic looked below that, the numerical control engine bed has the prominent superiority compared to the traditional engine bed, moreover these
16、 superiority come from the computer might which the numerical control system contains. 1 may process the traditional engine bed cannot process the curve, the curved surface and so on the complex components.2 may realize the processing automation, moreover is the flexible automation, thus the efficiency may enhance 3 7 times compared to the traditional engine bed.3 processings components precision high, size disper
