Chapter 4 Lesson 1.ppt

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1、Chapter4CNCMachinesLesson1TheFundamentalsofCNCLesson1TheFundamentalsofCNCPart1Newwordsandphrasesinconjunctionwith一起，连同，与···协力CNC(computernumericalcontrol)计算机数字控制drillpress钻床drillchuck钻夹头beltpulley带轮quilllever主轴控制杆interventionn干涉介入tediousnessn沉闷poten

2、tiala潜在的可能的conventionalmachine普通机床Lesson1TheFundamentalsofCNCequivalentn等价物：a相等的相当的同意义的CNCmachiningcenter数控加工中心CNCdrilling&tappingcenter数控钻削攻丝中心over-simplify过分简单化commonalityn共性公共implyvt暗示意味complexityn复杂复杂的事物axesn主轴accessoryn附属零件附加物full-blowna盛开的张满的成熟的

3、toolmagazine刀具库Lesson1TheFundamentalsofCNCPart2CNCstandsforComputerNumericalControlandhasbeenaroundsincetheearly1970s.Priortothis,itwascalledNC,fornumericalcontrol.Whilepeopleinmostwalksoflifehaveneverheardofthisterm,CNChastouchedalmosteveryformofmanu

4、facturingprocessinonewayoranother.Ifyou’llbeworkinginmanufacturing,it’slikelythatyou’llbedealingwithCNConaregularbasis.CNC代表计算机数字控制，自20世纪70年代以来一直受到人们的关注。此前它被称NC，即数字控制。虽然大多数其他行业的人从来没有听说过这个词，但CNC以这样或那样的方式几乎触及每一种形式的制造过程。从事制造业工作的人，很可能经常与CNC打交道。Lesson1TheF

5、undamentalsofCNCWhilethereareexceptionstothisstatement,CNCmachinestypicallyreplace(orworkinconjunctionwith)someexistingmanufacturingprocesses.Takeoneofthesimplestmanufacturingprocesses,drillingholes,forexample.尽管以上表述不尽如此，但数控机床显然替代（或参与）了现有的一些制造过程。举最简单的制

6、造过程――钻孔为例。Lesson1TheFundamentalsofCNCAdrillpresscanofcoursebeusedtomachineholes.Apersoncanplaceadrillinthedrillchuckthatissecuredinthespindleofthedrillpress.Theycanthen(manually)selectthedesiredspeedforrotation(commonlybyswitchingbeltpulleys),andactiv

7、atethespindle.Thentheymanuallypullonthequilllevertodrivethedrillintotheworkpiecebeingmachined.台式钻床当然可以用于加工孔。操作者可以将钻头装在钻夹中，钻夹固定在台钻的主轴里；接着可以（手工）选择所需的转速（通常通过切换皮带改变主轴转速），并且启动主轴旋转，然后操作钻轴手柄，将钻头钻入被加工的工件。Lesson1TheFundamentalsofCNCAsyoucaneasilysee,thereisalo

8、tofmanualinterventionrequiredtouseadrillpresstodrillholes.Apersonisrequiredtodosomethingalmosteverystepalongtheway!Whilethismanualinterventionmaybeacceptableformanufacturingcompaniesifasmallnumberofholesorworkpiecemustbemachined,butasqu