數(shù)控技術(shù)numericalcontrol中英文對照-文庫吧資料
2024-12-25 23:52本頁面
【正文】 torque． Other systems are in use，however， which in spite of the possibility of damage to the machine structure or to the mechanical system， ale designed with 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 two systems， closed and open loop， closed loop is more accurate and， as a consequence， is generally more expensive． Initially， open—loop systems were used almost entirely for lightduty applications because of inherent power limitations previously associated with conventional electric stepping motors． Recent advances in the development of electro hydraulic stepping motors have led to increasingly heavier machine load applications． 數(shù)控技術(shù) 數(shù)控是可編程自動化技術(shù)的一種形式，通過數(shù)字、字母和其他符號來控制加工設(shè)備。NUMERICAL CONTROL Numerical control(N／ C)is a form of programmable automation in which 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 program of instructions for a particular workpart or job． When the job changes， the program of instructions is changed． The capability to change the program is what makes N／ C suitable for lowand mediumvolume production． It is much easier to write programs than to make major alterations of the processing equipment． There are two basic types of numerically controlled machine tools： point—to—point and continuous—path(also called contouring)． Point—to—point machines use unsynchronized motors， with the result that the position of the machining head Can be assured only upon pletion of a movement， or while 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 following ponents： 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 when 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 thumbwheel 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 similar typ
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