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1、《机电专业英语》习题答案Lesson1ReadingDrawing1、①thefront,top,andright②front③sectioned2、④实线⑤虚线⑥点画线Lesson2TOOLBITMATERIALS1、thecharacteristicsandconditionoftheworkpiecematerial,theamountofstocktoberemoved,therequiredprovisionofthefinishedworkpiece,thesurfacefinish,therigidityoftheworkpie
2、ceandtoolholder,theconditionofthemachinetool,theheatgeneratedbyaparticularoperation,andsoon.2、Cuttingtools,tooperateefficiently,musthavepropertiessuchashothardness,toughness,resistancetocratering,wearresistance,andresistancetoshock.3、High-carbonsteel，High-speedsteel，Nonferr
3、ouscasttoolsteel，Carbides，Ceramictoolmaterial，IndustrialdiamondsMaterialAdvantagedisadvantageHigh-carbonsteelTheyareusedforsmall-quantityproductionofwoodpartsormachiningsoftmaterialssuchasfree-cuttingsteelsandbrass.However,anytemperatureincreasewillaffectthehardnessandeffec
4、tivenessofthetool.High-speedsteelHigh-speedsteelwilloperateuptoabout1100℉andretainitseffectiveness.Thisabilitytooperateatthesehighertemperaturesmakesitpossibletoincreasethecuttingspeedordepthofcut.acoolantshouldbeusedfreelytoincreasemaximumtoollife.NonferrouscasttoolsteelIt
5、operatesbestatelevatedtemperatures(approximately1500℉)；thecuttingspeedsmaybeincreasedwithoutdamagetothecuttingedgeofthetoollosingefficiencyifoperatedat“cold”temperatures.CarbidesCarbidesingeneralmaybeusedatcuttingspeedswhichareaboutthreetimesthatusedwithhigh-speedsteels.One
6、oftheproblemsencounteredwhenusingcarbides-andmostothertoolmaterials-iscratering.IfcarbideiscoatedwithTiC,aluminumoxide,ortitanium7nitride,thecrateringeffectisreducedfrom50%to90%andtoolwearisincreasedwhilecuttingspeedsmaybeincreasedsubstantially.CeramictoolmaterialThesetools
7、operateataboutthreetofivetimesthecuttingspeedofcarbides.Thereisnoneedtouseacoolant.Thelimitationsofceramictoolsprimarilyarewithinthebondingmaterialitselfandthepresent-daymachinetools.IndustrialdiamondsTheymaybeusedtomachinealuminum,plastics,hardrubber,and,ifusedwithveryfine
8、feedsandhighspindlespeeds,forfinefinishingofboredholesinsteel.Theyareexpensiveandd
