数控机床改造毕业设计外文翻译7640291.doc

河北建筑工程学院 毕业设计外文资料翻译 系别： 机械工程系 专业： 机械设计制造及其自动化 班级： 机094班 姓名： 刘 松 学号： 2009307408 外文出处： Software Department, Polytechnical University of Catalonia, Spain 附 件：1、外文原文；2、外文资料翻译译文。 指导教师评语： 签字： 年 月 日 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 in 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 lay the 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 ?to build? to become an engine bed special purpose computer 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 tube; 1959 second generation of -- transistor; 1965 third generation -- small scale integration electric circuit