数控专业英语教案.doc

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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二、教学目的：让同学们了解和掌握五种基本的金属加工工艺方法三、教学方法：讲授四、教学重点：金属成型的5种方法五、教学难点：车削和镗削六、使用教具：七、课后作业：Translation八、课后小结：lesson1FiveBasicTechniquesofMachiningMetalNewwords:1.variety［ｖə°ｒａｉəｔｉ］n.

2、种类，变化，多样化2.unlimited［ʌｎ°ｌｉｍｉｔｉｄ］adj.无限的3.bench［ｂｅｎｔ］n.工作台4.house［ｈａｕｓ］v.安装，容纳5.solid［°ｓɔｌｉｄ］adj.坚固的，固体的，实心的　n.固体，实体6.slot［ｓｌɔｔ］n.缝,槽，狭槽　v.开槽7.slottingmachine插床8.slotter［°ｓｌɔｔə］n.插床，铣槽机9.straight［ｓｔｒｅｉｔ］adj.直的,整齐的10.circle［°ｓəːｋｌ］v.,n.环绕，旋转，圆圈Tranlations:Machineto

3、olsaremadeinagreatmanytypesandsizes.Thevarietyofmachinetoolstodayisalmostunlimited.Somearesmallenoughtobemountedonabench.Othersaresolargethattheyrequirespecialbuildingtohousethem.［1］Somearerathersimple,whileothersareverycomplicatedinconstructionandtheircontrols.L

4、argeorsmall,simpleorcomplicated,machinetoolscanbecategorizedintofivemajorclassifications,identifiedasthefivebasictechniquesofshapingmetal.(1)Drilling.Drillingistheoperationofproducingholesinsolidmetal.Arotatingdrillcalledatwistdrillisused.Machinetoolsfordrillingh

5、olesarecalleddrillingmachines.Therearemanytypesandsizesofdrillingmachines.Thesemachinescanperformotheroperationsbesidesdrilling.Theworkpieceisheldstationary,thatis,clampedinposition,andasthedrillrotates,itisfedintotheworkpiece［2］(Fig.1-1).(2)TurningandBoring.Thee

6、nginelatheisthemostcommontypeofmachinetoolforturningwork.Turningistheoperationofcuttingorremovingmetalfromawokpiece.Acuttingtoolisfedintooralongtheworkwhiletheworkpiecerevolves(Fig.1-2).Boringistheoperationofenlargingormachiningaholethathasbeendrilledorcastintoth

7、emetal.Boringinalatheisdonebyfeedingasingle-pointcuttingtoolintotheworkasitrevolves［3］(Fig.1-3).(3)Milling.Millingistheoperationofremovingmetalbymeansofarotatingcuttingtool,whichhasmultiplecuttingedgesandiscalledamillingcutter(Fig.1-4).(4)Grinding.Grindingistheop

8、erationofcuttingorremovingmetalbymeansofanabrasivewheelcalledagrindingwheel.Grindingfinishesworkveryaccuratelyandsmoothly.Whengrindingroundwork,theworkpiecerev