數(shù)控專(zhuān)業(yè)畢業(yè)設(shè)計(jì)外文翻譯--數(shù)控技術(shù)-數(shù)控設(shè)計(jì)-文庫(kù)吧資料
2025-01-27 12:01本頁(yè)面
【正文】 or torque． Other systems are in use， how ever， w hich in spite of the possibility of damage to the machine structure or to the mechanical system， ale designed w ith special high—torque stepping motors． In this case， the motors have sufficient capacity to “overpower” the system in the event of almost any contingency． The original N／ C used the closed—loop system． Of the tw o systems， closed and open loop， closed loop is more accurate and， as a consequence， is generally more expensive． Initially， open—loop systems w ere used al most entirely for lightduty applications because of inherent pow er limitations previously associated w ith conventional electric stepping motors． Recent advances in the development of electro hydraulic stepping motors have led to increasingly heavier machin e load applications． 數(shù) 控技術(shù) 數(shù)控是可編程自動(dòng)化技術(shù)的一種形式，通過(guò)數(shù)字、字母和其他符號(hào)來(lái)控制加工設(shè)備。外文翻譯 NUMERICAL CONTROL Numerical control(N／ C)is a form of programmable automation in w hich the processing equipment is controlled by means of numbers ，letters， and other symbols． The numbers， letters， and symbols are coded in an appropriate format to define a p rogram of instructions for a particular w ork part or job． When the job changes， the program of instructions is changed． The capability to change the program is w hat makes N／ C suitable for low and mediumvolume production． It is much easier to w rite programs than to make major alterations of the processing equipment． There are tw o basic types of numerically controlled machine tools：point—to—point and continuous—path(also called contouring)． Point—to—point machines use unsynchronized motors，w ith the result that the position of the machining head Can be assured only upon pletion of a movement， or w hile only one motor is running． Machines of this type are principally used for straight—line cuts or for drilling or boring． The N／ C system consists of the follow ing p onents： data input， the tape reader with the control unit， feedback devices， and the metal—cutting machine tool or other type of N／ C equipment． Data input， also called “man—to—control link”， may be provided to the machine tool manually， or entirely by automatic means． Manual methods w hen used as the sole source of input data are restricted to a relatively small number of inputs． Examples of manually operated devices are keyboard dials， pushbuttons， switches， or thumbw heel selectors． These are located on a console near the machine． Dials ale analog devices usually connected to a synchrotype resolver or potentiometer． In most cases， pushbuttons， switches， and other
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