数控技术应用专业英语LS2-2

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1、学习情境2LS2CNCMachiningCenter班级学习任务2Task2ProcessAnalysisofCNCMachiningCenter%学时KnowledgeobjectsLToreadandlearntheknowledgeaboutprocessanalysisofCNCmachiningcente匚2.Graspthemethodofreadingpartdrawing・3.Graspthemeaningofcuttingdosageandcanselectitcorrectly.4.Masterthegrammaticalstructu

2、res.Abilityobjects1.HelpthestudentstolearnsomephrasalverbsandfunctionalitemsabouttheprocessanalysisofCNCmachiningcenterandtrytousethem.2.Strengthentheirabilitiesofreading.3.Improvetheabilityofgettingspecificinformationfromreadingthetext.4.Improvetheabilityofanalysisandsolvingprobl

3、em・5.Haveteamspritandresponsibility・TeachingMethodsSpeaking;Discussing;Pair-work&group-workTeachingaids:Multi-mediacomputer;PPTTeachingcontentRemarksPartATechnicalReadingl.ReadingPartDrawing会读零件图TechnicalRequirements1.UaspecifiedtoleraocessboildteettherequireaentsofGB/r11H-1M6.2.U

4、nspecifiedlengthdimensionsaretllovedtoit.Indeviation.3.Breakin;sharpcorcers・4.Afterprocessing,thepartdoesnotallotborr.DRAMENDCAP1:1CHRDALFitijhfcUufpalra:i«ttedNlvtalite2-2-12.PreparingforProcessAnalysis(1)Toolsselection(Fig-2-2-2)(c)Edge-finder(a)Machinevise机用虎钳(b)Dialtestindicat

5、or百分表寻边器(d)Z-zcro-sctterZ轴设定器重点：会正确选择工具量具刀具Fig.2-2-2Tools采用行动导向教学法引(2)Measuringtoolsselection(Fig.2-2-3)vernierCciliper游标卡尺depthverniercaliper深度游标卡尺insidemicrometer.内径千分尺(a)Verniercaliper(b)LkplhverniercaliperFig.2-2・3Measuringtools(c)Insidemicro(3)Cuttersselection(Fig.2-2-4)(a)Fi

6、kxmillingculler难点：会判断顺铳和逆铳(b)Keyuayculler(c)Cenicrdrill(d)TwistdrillFig.2-2-4Cutters(c)Reanicr(4)Millingmodeselection顺铳：climbmilling逆铳：conventionalmilling・Forclimbmilling,therotationaldirectionofthemillingcutterissameasthedirectionofcuttingfeed.Iftherotationaldirectionofthemilling

7、cutterisoppositetothedirectionofcuttingfeedyitisconventionalmillingJL即铳削时铳刀的旋转方向与切削进给方向相同；另一种是逆铳，即铳削时铳刀的旋转方向与切削进给方向相反。】climbmillingentionalmillingconventionalmilling(b)ClimborconventionalmillingthFig.2-2-5climbmillingandconventionalmillingThesmallercuttingmarginyouleave^themoreobv

8、iouslyelasticbendingdeformationth