机械制造类专业英语（第2版）课件 module four advanced manufacturing equipment and cases.ppt

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机械制造类专业英语（第2版）课件 module four advanced manufacturing equipment and cases.ppt

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Thefollowingisasimpletypeofdrawdieinwhichtheprecutblankisplacedintherecessontopofthedie,andthepunchdescends,pushingthecupthroughthedie.CanyounamethetermsinChinese?Thesecondfigureshowsasimpleformofdrawingdiewitharigidflatplanholderforusewith13-gageandheavierstock,discussingwithyourclassmatestheterminologyandtrytorememberinmind.Deepdrawsmaybemadeonsingle-actiondies,wherethepressureontheblankholderismoreevenlycontrolledbyadiecushionorpadattachedtothebedofthepress.Thefollowingisatypicalconstructionofsuchadie.Incompressionmolding,areshapedchargeofmaterial,apremeasuredvolumeofpowder,oraviscousmixtureofliquidresinandfillermaterialisplaceddirectlyintoaheatedmoldcavity.Formingisdoneunderpressureformaplugorfromtheupperhalfofthedie(Figure3-1).Compressionmoldingresultsintheformationofflash(ifadditionalplasticisforcedbetweenthemoldhalves,becauseofapoormoldfitorwear,itiscalledflash.),whichissubsequentlyremovedbytrimmingorothermeans.Whichofthefollowingaremadebycompressionmolding?Pleasetickit.√dishes√handles√containercaps√fittings√electricalandelectroniccomponents√washing-machineagitators√housing√fiber-reinforcedpartswithlongchoppedfiberssemipositiveforqualityproductionpositiveforhighdensityflash-typeforshalloworflatparts（a）positive（b）semipositive（c）flash（d）diedesignformakingacompression-moldedpartwithundercutsBeforeasheet-metalpartismade,ablankofsuitabledimensionsisfirstremovedfromalargesheetbyshearing,thatis,thesheetiscutbysubjectingittoshearstresses,typicallyoncedevelopedbetweenapunchandadie.ThefollowingFiguresarepresentedIfthecontourtobeblankedisirregularlyshaped,thesummationofshearingforcesonones