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Unit1
Fracturetoughness断裂韧度plasticdeformation塑性变形fiber-reinforcedcomposite纤维增强型复合材料particle-reinforcedcomposite颗粒增强型复合材料
Unit2
plaincarbonsteel普通碳素钢ironcarbon铁碳合金hardening淬火tempering回火saltbath盐浴annealing退火
FCCfacecenteredcubic面心立方BCC体心立方
Unit3
sandcasting砂型铸造partingsurface分型面alignmentpin定位销turbineblade涡轮叶片centrifugalcasting离心铸造
Unit4
open-dieforging自由锻closed-dieforging模锻/模型锻造surfacefinish表面粗糙度
marinepropellershaft船用螺旋桨轴
Unit5
powdermetallurgy粉末冶金colduniaxialpressing,冷单向压制coldisostaticpressing,冷等静压hotisostaticpress热等静压
Unit6
Reciprocatingscrewinjectionmoldingmachine往复式螺杆注射成型机
Unit7
Rakeangle,前角clearanceangle,后角builtupedge,积屑瘤cuttingfluid,切削液
Unit8
Abrasivewheel,砂轮grindingwheel,砂轮
Unit9
Electropolishing,电解法抛光chemicalmechanicalpolishing,化学机械抛光
Unit10
Electroplating,电镀PVD(PhysicalVaporDeposition),物理气相沉积CVD(ChemicalVaporDeposition)化学气相沉积
Unit11
Lathebed,床身headstock,主轴箱tailstock,尾座leadscrew,丝杠feedrod,光杠
Unit12
Throughhole,贯穿孔blindhole,盲孔twistdrill,麻花钻
Unit13
Drilljig,钻模
Unit14
Clearancefit,间隙配合transitionfit,过渡配合interferencefit,过盈配合shaft-basissystem,基轴制hole-basissystem基孔制
Unit15
Electricaldischargemachining,电火花加工electrochemicalmachining,ultrasonicmachining,
Unit16
Laserbeammachining,electron-beammachining,电子束加工
PartII
Virtualmanufacturing,flexiblemanufacturingsystem,agilemanufacturing,
∙Linearinterpolation线性内插法,circularinterpolation环形内插法
∙Manualprogramming人工编制程序
∙,computeraidedprogramming计算机辅助程序设计
Touchprobe接触式探头,machiningcenter,turningcenter
∙Cartesianrobot直角坐标型机器人
∙,cylindricalrobot圆柱坐标型机器人
Grouptechnology,
2,选择填空:
把给定的单词选择到相应的空格。
共60分。
有3篇文章。
A.partingline,B.riser,C.vibration,D.flask,E.Coreprint,F.shrinks,G.cope,H.Core,I.sand,J.drag,(此文章来自于教材Unit3)
Thecavityinthesandisformedbyusingapattern(anapproximateduplicateoftherealpart),whicharetypicallymadeoutofwood,sometimesmetal.Thecavityiscontainedinanaggregate聚合的;
集合的;
合计的housedinaboxcalledthe_flask__.___isasandshapeinsertedintothemoldtoproducetheinternalfeaturesofthepartsuchasholesorinternalpassages.Coresareplacedinthecavitytoformholesofthedesiredshapes._Coreprint__istheregionaddedtothepattern,core,ormoldthatisusedtolocateandsupportthecorewithinthemold.
Ariser___isanextravoidcreatedinthemoldtocontainexcessivemoltenmaterial.Thepurposeofthisistofeedthemoltenmetaltothemoldcavityasthemoltenmetalsolidifiesandshrinks___,andtherebypreventsvoids空隙inthemaincasting.
Inatwo-partmold,whichistypicalofsandcastings,theupperhalf,includingthetophalfofthepattern,flask,andcoreiscalled_cope__andthelowerhalfiscalleddrag___,asshowninFig.3.1.Thepartinglineorthepartingsurfaceislineorsurfacethatseparatesthecopeanddrag.Thedragisfirstfilledpartiallywithsand___,andthecoreprint,thecores,andthegatingsystemareplacednearthepartingline___.Thecopeisthenassembledtothedrag,andthesandispouredonthecopehalf,coveringthepattern,coreandthegatingsystem.Thesandiscompactedbyvibration___andmechanicalmeans.
下面的文章都要认真阅读!
Electroplatingisanelectrochemicalprocessbywhichmetalisdepositedonasubstrate基质;
基片bypassingacurrentthroughthebath.
∙Usuallythereisananoden.[电]阳极,正极(positivelychargedelectrode),whichisthesourceofthematerialtobedeposited;
theelectrochemistrywhichisthemediumthroughwhichmetalionsareexchangedandtransferredtothesubstratetobecoated;
andacathode(negativelychargedelectrode)whichisthesubstratetobecoated.
Platingisdoneinaplatingbathwhichisusuallyanon-metallictank(usuallyplastic).Thetankisfilledwithelectrolyte电解液whichhasthemetal,tobeplated,inionicform.
Theanodeisconnectedtothepositiveterminalofthepowersupply.Theanodeisusuallythemetaltobeplated(assumingthatthemetalwillcorrodeintheelectrolyte).Foreaseofoperation,themetalisintheformofnuggetsandplacedinaninertmetalbasketmadeoutnon-corrodingmetal(suchastitaniumorstainlesssteel).
Thecathodeistheworkpiece,thesubstratetobeplated.Thisisconnectedtothenegativeterminalofthepowersupply.Thepowersupplyiswellregulatedtominimizeripplesaswelltodeliverasteadypredictablecurrent,undervaryingloadssuchasthosefoundinplatingtanks.
Asthecurrentisapplied,positivemetalionsfromthesolutionareattractedtothenegativelychargedcathodeanddepositonthecathode.Asareplenishmentforthesedepositedions,themetalfromtheanodeisdissolvedandgoesintothesolutionandbalancestheionicpotential.(此文章来自于教材Unit10)
Itisknownthatmetalsareveryimportantinourlife.Metals(金属)havethegreatestimportanceforindustry.Allmachinesandotherengineeringconstructions(结构)havemetalparts,someofthemconsistonlyof(由…构成)metalparts.
Therearetwolargegroupsofmetals:
1)Simplemetals–moreorless(或多或少)purechemicalelements.
2)Alloys(合金)–materialsconsistingofsimplemetalcombinedwith(与…结合)someotherelements(元素).
Abouttwothirdsofallelementsfoundintheeartharemetals,butnotallmetalsmaybeusedinindustry.Thosemetalswhichareusedinindustryarecalledengineeringmetals(工程金属).Themostimportantengineeringmetalisiron(Fe)(铁),whichintheformofalloyswithcarbon(C)(碳元素)andotherelements,findsgreaterusethananyothermetal.Metalsconsistingofironarecalledferrousmetals(黑色金属).Themostimportantnonferrousmetalsarecopper(Cu)(铜),aluminum(Al)(铝),lead(铅)(Pb),zinc(锌)(Zn),tin(锡)(Sn),butallthesemetalsareusedmuchlessthanferrousmetals,becausetheferrousmetalsaremuchcheaper.
Engineeringmetalsareusedinindustryintheformofalloysbecausetheproperties(特色)ofalloysaremuchbetterthanthepropertiesofpuremetals.Onlyaluminummaybelargelyusedintheformofsimplemetal.Metalshavesuchagreatimportancebecauseoftheirusefulpropertiesortheirstrength,hardness,andplasticity(弹性).
Differentmetalsareproducedindifferentways,butalmostallthemetalarefoundintheformofmetalore(矿石)(ironore,copperore,etc).Theoreisamineral(矿物质)consistingofametalcombinedwithsomeimpurities(杂质).Inordertoproduceametalfromsomemetalore,wemustseparatetheseimpurities(杂质)frommetalthatisdonebymetallurgy(冶金术).
Theworldismadeupofmatters.Therearesomanydifferenttypesofmaterialsintheworld.Werefertothematerialsappliedinengineeringfieldasengineeringmaterials.Therearealotofclassificationschemesaboutengineeringmaterials.Accordingtothechemicalelement,engineeringmaterialscanbedividedintometalsandnonmetals.Accordingtotheiruseinmanufacturing,engineeringmaterialscanbeclassifiedintotwomajorcategories:
toolmaterialsandworkpartmaterials.
Metalmaterialshavesomefundamentalproperties,suchashardness,strength,density,thermalconductivityandsoon.Themostimportantmetalmaterialsinmanufacturingarecastironandsteel.Castironandsteelarebothironcarbon.Castironusuallycontains2to4.5percentcarbon,0.5to3percentsilicon,andlesseramountsofsulfur,manganese,andphosphorus.Itishard,brittleandnonmalleable,soitiscommonlyusedincastingintovariousshapes.Steelcontains0.2and1.5percentcarbon,oftencontainsotherconstituentssuchasmanganese,chromium,nickel,molybdenum,copper,tungsten,cobaltetc.toachievecertainpropertiesneeded.Steelisnotonlyhardandstrong,butmalleableonaccountoflowercarboncontent,soithasbeenusedmorewidely.Therearealsoothermetalmaterialsusedinmanufacturingsuchasaluminum&
aluminumalloy,copper&
copperalloy,titaniumalloyandsoforth.
Themostwidelyusednonmetalmaterialsmaybeengineeringplastics.Plasticsareorganiccompoundsproducedbypolymerization.Thecommonengineeringplasticscanbegroupedintotwotypesthatarethermoplasticandthermosettingplastics.ThermoplasticsincludePE(polyethylene),PVC(PolyvinylChloride),PP(polypropylene),PS(polystyrene),ABS,nylon,andsoon.ThermosettingplasticsincludeEP(epoxy),bakelite,andsoon.Duetoitsgoodplasticityandfluidity,theplasticcannotonlybeusedininjectionmolding,butalsobeextrudedorcastintoshapes.Therubberisanothermajorcategoryinnonmetalmaterials.Itcanbedividedintonaturalrubberandsynthetic(合成的)rubberaccordingtothesourceofrawmaterials.Becauseofitshighelasticity(弹性)andelectricinsulation,rubbercanbeusedinmakingtires,shockabsorbers,airproofloopsandelectricdevices.Nowmoreandmorecompositesareusedinengineering,especiallyinaerospace,biomedicine.Compositesarecombinedwithtwoormoredistinctmaterials.Itcanbedividedintothreetypes:
fiber-reinforced,particulate,andlaminatedcomposites.
Toolmaterialsmaybeeithermetalornonmetal.High-speedsteelandcarbidearethemostwidelyusedmetaltoolmaterials.Nonmetaltoolmaterialsincludeceramic,diamondandCBN(CubicBoronNitride).
Workpartmaterialsalsoinvolvemetalandnonmetal.Plasticscanbeusedinmakingautomobilelamps,panels,toysandsoon.Metalcanbeusedinmanufacturingvarietyofparts.Takelatheasanexample,Castironcanbeusedinmanufacturingheadstockandbed.However,spindleandgearsaremadeofsteel.
Metalwo