数控专业英语教案

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1、《数控专业英语》电子教案适用班级：10级数控技术李柏华2012年9月课题一一、章节：lesson1FiveBasicTechniquesofMachiningMetal「•、教学冃的：让同学们了解和掌握五种革木的金属加工工艺方法三、教学方法：讲授四、教学币金属成型的5种方法五、教学难点：午削和铎削六、使用教具：七、课后作业：Translation八、课后小结：lesson1FiveBasicTechniquesofMachiningMetalNewwords:1.variety[va°raioti]n.种类，

2、变化，多样化1.unlimited[n°1imitid]adj.无限的2.bench[bent]n.丁•作台3.house[haus]v.安装，容纳5.solid[°s6.slot[s1lid]adj.坚固的，固体的，实心的n.固体，实体t]n.缝，槽，狭槽V.开槽7.slottingmachine插床8.slotter[°s1to]n.插床，铳槽机9.straight[streit]adj.直的，整齐的10.circle[°sok1]v.,n.环绕，旋转，圆圈Tranlations:Machinetools

3、aremadeinagreatmanytypesandsizes・Thevarietyofmachinetoolstodayisalmostunlimited.Somearesmallenoughtobemountedonabench.Othersaresolargethattheyrequirespecialbuildingtohousethem.[1]Somearerathersimple,whileothersareverycomplicatedinconstructionandtheircontrol

4、s.Largeorsmall,simpleorcomplicated,machinetoolscanbecategorizedintofivemajorclassifications,identifiedasthefivebasictechniquesofshapingmetal・(1)Drilling・Drillingistheoperationofproducingholesinsolidmetal・Arotatingdrillcalledatwistdrillisused・Machinetoolsfor

5、drillingholesarecalleddrillingmachines.Therearemanytypesandsizesofdrillingmachines.Thesemachinescanperformotheroperationsbesidesdrilling・Theworkpieceisheldstationary,thatis,clampedinposition,andasthedrillrotates,itisfedintotheworkpiece[2](Fig.1-1).(2)Turnin

6、gandBoring.Theenginelatheisthemostcommontypeofmachinetoolforturningwork・Turningistheoperationofcuttingorremovingmetalfromawokpiece・Acuttingtoolisfedintooralongtheworkwhiletheworkpiecerevolves(Fig.1-2).Boringistheoperationofenlargingormachiningaholethathasbe

7、endrilledorcastintothemetal.Boringinalatheisdonebyfeedingasingle-pointcuttingtoolintotheworkasitrevolves[3](Fig・1-3)・(3)Milling・Millingistheoperationofremovingmetalbymeansofarotatingcuttingtool,whichhasmultiplecuttingedgesandiscalledamillingcutter(Fig.1-4).

8、(4)Grinding.Grindingistheoperationofcuttingorremovingmetalbymeansofanabrasivewheelcalledagrindingwheel.Grindingfinishesworkveryaccuratelyandsmoothly.Whengrindingroundwork,theworkpiecerevolvesasitisfeda