模具专业英语.ppt

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1、ProfessionalEnglishondesignofplasticmouldChapter5Mouldtempreturecontrol2012-11.211Chapter5Mouldtempreturecontrol例句分析Itisoftenfoundadvantageoustouseaslightlyhighertemperaturethanrequiredjusttofilltheimpression,asthistendstoimprovethesurfacefinishofth

2、emoldingbyminimizingweldlines,flowmarksandotherblemishes.2Chapter5Mouldtempreturecontrol例句分析Thereforetoachieveanevencoolingrateoverthemoldingsurfaceitisnecessarytolocatetheincomingcoolantfluidadjacentto‘hot’moldingsurfacesandtolocatethechannelsconta

3、ining‘heated’coolantfluidadjacentto‘cool’moldingsurfaces.3Chapter5Mouldtempreturecontrol课文详解Onefundamentalprincipleofinjectionmoldingisthathotmaterialentersthemould,whereitcoolsrapidlytoatemperatureatwhichitsolidifiessufficientlytoretaintheshapeofth

4、eimpression.4Chapter5Mouldtempreturecontrol课文详解Thetemperatureofthemouldisthereforeimportantasitgovernsaportionoftheoverallmoldingcycle.5Chapter5Mouldtempreturecontrol课文详解Whilethemeltflowsmorefreelyinahotmould,agreatercoolingperiodisrequiredbeforeth

5、esolidifiedmoldingcanbeejected.6Chapter5Mouldtempreturecontrol课文详解Alternatively,whilethemeltsolidifiesquicklyinacoldmoulditmaynotreachtheextremitiesoftheimpression.7Chapter5Mouldtempreturecontrol课文详解Acompromisebetweenthetwoextremesmustthereforebeac

6、ceptedtoobtaintheoptimummoldingcycle.8Chapter5Mouldtempreturecontrol课文详解Theoperatingtemperatureforaparticularmouldwilldependonanumberoffactorswhichincludethefollowing:9Chapter5Mouldtempreturecontrol课文详解typeandgradeofmaterialtobemolded;lengthoffloww

7、ithintheimpression;wallsectionofthemolding;lengthofthefeedsystem,etc.10Chapter5Mouldtempreturecontrol课文详解Itisoftenfoundadvantageoustouseaslightlyhighertemperaturethanisrequiredjusttofilltheimpression,asthistendstoimprovethesurfacefinishofthemoldingb

8、yminimizingweldlines,flowmarksandotherblemishes.11Chapter5Mouldtempreturecontrol课文详解Tomaintaintherequiredtemperaturedifferentialbetweenthemouldandplasticmaterial,water(orotherfluid)iscirculatedthroughholesorchannelswithinthemould.12Chapter5Mouldtemp