材料成型及控制工程专业英语配套教学课件刘瑛电子课件 Unit 11.ppt

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1、Unit11ForgingofMaterials金属锻造成形Objective3.2.4.5.1.Knowwhatkindofproductscanbeproducedbyforging;Understandmainforgingprocessincloseddieforging;Understandtheusageofaflash;Befamiliarwithtwomaintypesofforging;Usegerunds（动名词）correctly.WarmingupThinkofanidiomth

2、atdescribestheblacksmith’swork.Discussaboutthesimilaritiesbetweentheblacksmith’sworkandmodernmachineforgingprocess.Task1WarmingupSelecttheproductswhichareproducedmainlybyforgingTask2(a)Ironwire(b)Kettle(c)Motorbody(d)Crankshaft（曲柄轴）(e)ConnectionrodWarmin

3、gupWatchVideo11-1,andfillintheblanksinthetextTask3hammers,pressesAnswerWarmingupWatchVideo11-2,andwritedownthetwoforgingprocess.Task4(a)opendieforging(b)closeddieforgingAnswerWarmingupReadthetext,andwatchVideo11-2again.FillintheblanksTask5TextAnswerthefo

4、llowingquestions:Whatarethetwomainkindofprocessesinopendieforging?Whatsizeofproductscanbeforgedinopendieforging?Whyarethediesheatedincloseddieforging?Task6Lengtheningandupsetting（缩锻）Theycanrangefromafewcentimeterstothirtymetersinlength.Inordertominimizec

5、hillingandcoolingintheworkpiece.AnswerTextWatchVideo11-3andlabelthefollowingsteps.Task71.blank2.edging（压边）3.blocking（预锻）4.finishing（终锻）5.trimming（切飞边）AnswerTextFillintheblanksTask8(a)flesh(b)gutter(c)landAnswerLanguageStudyGerundLengtheningandupsettingar

6、etypicallydoneUsingmultipleimpacts.Everygerund,endsining.Thegerundalwayshasthesamefunctionasanoun,soitcanbeused:asthesubjectofthesentence:afterprepositions(介词).Thegerundmustbeusedwhenaverbcomesafterapreposition:Thisisthedeformationofworkpiecebetweenflato

7、rshapeddieswithoutcompletelyrestrictingmetalflow.Forgingisasimpleprocessofshapingsolidmetalwiththeuseofmechanicalhammersandpresses.Thisdeformationcanresultinlengtheningoftheworkpiecewhilereducingitscrosssection.GerundLanguageStudyincompoundnounsafterthee

8、xpressions:can'thelp,can'tstand,it'snouse/good,finish:Forging,performing,chilling,coolingBlockingistorefinetheshapeforfinishforging.GerundLanguageStudyFillintheblankswiththepropergerundsForgingisa…………………(manufacture)proces