毕业设计外文翻译
外文原文
The Numerical Control Engine Bed Transforms
Harvey B.M ackey
First numerical control system development summary brief history and tendency.
In 1946 the first electronic accounting machine was born the world,this indicated the humanity created has been possible to strengthen and partially to replace the mental labor 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 laythe foundation.
After 6 years, in 1952, computer technology applied 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.
1.1 Numerical control (NC) 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 \build\become an engine bed special purpose computer to take the numerical control system, is called the hardware connectionnumerical 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 tube; 1959 second generation of -- transistor; 1965 third generation -- small scale integration electric circuit.
1.2 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 system the core part, from this time on enteredthe computer numerical control (CNC) the stage (\shouldhave 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 unitsand the controller, 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 minicomputer function too strong, controlled an engine bed ability to have wealthily (therefore once uses in controlling the multi- Taiwan engine bedat that time, called it group control), was inferior to used the microprocessor economy to be reasonable. Moreover thensmall machine reliability was not ideal. The early microprocessor speed and the function although insufficiently are alsohigh, but may solve through the multi-processor structure.Because the microprocessor is the general-purpose calculatorcore part, therefore still was called the computer numericalcontrol.
In 1990, PC machine (personal computer, domestic customhad called microcomputer) the performance has developed tothe very high stage, may satisfiedly 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 experienced 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 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 \control\the materially already was refers to \numerical control\
1.3 the numerical control future will develop tendency
1.3.1 open style continues to, to develop based on the PC sixth generation of direction
The software and hardware resources has which based on PC are rich and so on the characteristic, the more numerical controls serial production factory can step onto this path. Uses PC machine to take at least its front end machine, processes the man-machine contact surface, the programming, the association .
Question and so on net correspondence, undertakes the numerical control duty by the original system. PC machine has the friendly man-machine contact surface, will popularize to
数控机床改造——机械专业毕业设计外文文献翻译(中英文翻译)
