【正文】 merical control system has experienced two stages and six generation of development. , numerical control (NC) stage (1,952 ~ in 1970) The early puter operating speed is low, was not big to then science putation and the data processing influence, but could not adapt the engine bed realtime control request. The people can not but use numeral logic circuit to build to bee an engine bed special purpose puter to take the numerical control system, is called the hardware connection numerical control (HARDWIRED 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。 如：降低了工人的勞動(dòng)強(qiáng)度，節(jié)省了勞動(dòng)力（一個(gè)人可以看管多臺(tái)機(jī)床），減少了工裝，縮短了新產(chǎn)品試制周期和生產(chǎn)周期，可對(duì)市場(chǎng)需求作出快速反應(yīng)等等。遠(yuǎn)程通訊，遠(yuǎn)程診斷和維修將更加普遍。于是將它移植過(guò)來(lái)作為數(shù)控系統(tǒng)的核心部件，從此進(jìn)入了計(jì)算機(jī)數(shù)控（ CNC）階段（把計(jì)算機(jī)前 面應(yīng)有的 通用 兩個(gè)字省略了）。人們不得不采用數(shù)字邏輯電路 搭 成一臺(tái)機(jī)床專用計(jì)算機(jī)作為數(shù)控系統(tǒng)，被稱為硬件連接數(shù)控（ HARDWIRED NC），簡(jiǎn)稱為數(shù)控（ NC）。 、數(shù)控未來(lái)發(fā)展的趨勢(shì) 繼續(xù)向開(kāi)放式、基于 PC 的第六代方向發(fā)展 C 所具有的開(kāi)放性、低成本、高可靠性、軟硬件資源豐富等特點(diǎn)，更多的數(shù)控系統(tǒng)生產(chǎn)廠家會(huì)走上這條道路。 可實(shí)現(xiàn)多工序的集中，減少零件 在機(jī)床間的頻繁搬運(yùn)。 1974 five dynasties microprocessor and 1990 sixth generation (overseas was called PCBASED) based on PC. Also must point out, although overseas already renamed as the puter 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 puter numerical control. , the numerical control future will develop tendency open style continues to, to develop based on the PC sixth generation of direction Open, the low cost, redundant reliable, 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 question and so on manmachine contact surface, programming, working correspondence, undertakes the numerical control duty by the original system. PC machine has the friendly manmachine contact surface, will popularize to all numerical controls system. The l