机械制造专业外文翻译--机床数控改造.doc

外文原文:
Machine tool numerical control reforms
First, CNC systems and the development trend of history
1946 birth of the world's first puter, which shows that human beings created to enhance and replace some of the mental work tools. It and human agriculture, industrial society in the creation of those who merely pared to manual tools, from a qualitative leap for mankind's entry into the information society laid the foundation. Six years later, in 1952, computer technology applied to the machine in the United States was born C machine tools. Since then, the traditional machine produced a qualitative change. Nearly half a century since C system has experienced two phases and six generations of development.
, Numerical Control (NC) phase (1952 to 1970)
puter'putational speed low and the prevailing puting and data processing is not affected, but can not meet the requirements of real-time control machine. People have to use digital logic circuit "tied" into a single machine as a puter numerical control system, known as the hardware connection NC (HARD-WIRED NC), called the Numerical Control (NC). With the development ponents of this phase after three generations, that is, in 1952 the first generation - tube; 1959 of the second generation - transistor; 1965 of the third generation - small-scale integrated circuits.
, Computer Numerical Control (CNC) phase (1970 to present)
To 1970, GM has been a puter and mass-produced. So it transplant system as the ponent of NC, have entered puter Numerical Control (CNC) stage (in front of puter should be "universal" word omitted). To 1971, the United States pany in the world will be the first time the two most ponents - computing and controller, a large-scale integrated circuit technology integration in a chip, called the microprocessor (MICROPROCESSOR) , also known as the central processing unit (CPU).
1974 microprocessor to be used C system. This is because the function of puter is too small to control a machine to