机电数控英语课后习题答案doc文档格式.docx
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5.thebasicwheel主动齿轮10.材料强度
IIIFillintheblankswiththeproperwordformifnecessary.
1.gears2.standardize3.reliability4.Machinery5.assembleponents7.uniformity
8.estimate9.expectancylO.individual
IV.TranslatefollowingsentencesintoEnglish.
1•最Themostcommonmachineelementisthegear,whichcombinesthefeatureofthewheelandthelevertoformatoothedwheel.
2.Thehardnessofageardeterminesitsabilitytoresistwear,
3.Manufacturingengineershavecenteredtheireffortsonthedevelopmentofstandardizedelements
4・Thesepartsareproducedinlargequantitieswithahighdegreeofperfectionatreducedcost.
5.Itseemsthatthemachinepartsurfaceisthecarrieroffunctionalinformationforbothmachineelementandprocessingapparatus,
6.Properapplicationofthesemachineelementsdependsuponknowledgeoftheforceonthestructureandthestrengthofthematerialsemployed・
IExercises第2章
1.Doyouknowwhytherearesomanytypesofbearings?
Therearemanytypesofbearingsbecauseofvariationsinthedesignofringsandseparatorsandinthenumberofballs.
2.Forwhatreasonaredeepgrooveradialballbearingsmaswidelyused?
Althoughdeepgrooveballbearingsaredesignedtocarryaradialload,theyperformwellunderacombinedradialandthrustload,Forthisreasonjtisthemostwidelyusedtypeofballbearing.
3.Accordingtothetext,howmanytypescanbedividedinto?
whatarethey?
Thebearingscanbedividedinto6types,thatis,deepgrooveballbearings,filled-notchballbearings^angularcontactbearings^self-aligningballbearings^thrustballbearingsandrollerbearings.
4.Whycanrollerbearings•••••higherloadthanthesamesizeballbearings?
Becauseithaslinecontactinsteadofpointcontact.
5.Dependingonitssize,afterincreasingbearingJsittrue?
Yes,itistrue.
1.轴承承载能力一bearingloadcapacity6.深沟球轴承
2.径向载荷radialload7.角接触球轴承
3.滚柱轴承rollerbearing8调心球轴承
4.轴向载荷thrustload9推力球轴承
5.公共球面滚道一commonsphericalrace10填充式滚球轴承
III
1.Accordingtotheir.・・.anda（combination）ofthrustandradialloads.
2.Theracesarediameterin（deepgrooveballbearings・
3.Toincreasethebearing（loadcapacity）・
4.Unidirectionalthrustto（support）combined•…loads.
5>
（seld-aligningball）«
6<
（higherload）.7.（theballcomplement）®
.「evolvingrings）.10」inecontact
1V.1沟:
Thedeepgrooveballbearingisthemostwidelyusedtypeofballbearing・
1.多数:
Manybearingsrequireperiodicmaintenancetopreventprematurefailure・2•滚柱:
Rollerbearingcansupportmuchhigherloadthancomparablysizedballbearing.
3•预期:
Approximatelytwo-thirdsasmanymaterialswouldbeexpectedtoproducethesameeffect.
4•这一:
Thisprogrammewillrequireatwenty-fivepercentincreaseinprocessorcapacity.
5.一般:
Thesurfacetemperatureofthebearingswasgenerallythesameaswhathasbeenpreviouslyobserved.
Exercises第3章
Il.Whatisthewayofpartsmatingintheearlydaysofengineering?
IntheearlydaysofengineeringJhematingofpartswasachievedbymachiningonepartasnearlyaspossibletotherequiredsize,machiningthematingpartnearlytosize9andthencompletingitsmachining^continuallyofferingtheotherparttoit^untilthedesiredrelation-shipwasobtained*
2・Whatistheadvantageofinterchangeabilitysystem?
Asystemofinterchangeabilityusuallylowertheproductioncosts,asthereisnomeedforanxpensivenfiddlinglloperation,anditalsobenefitsthecustomerintheeventoftheneedtoreplacewornparts.
3・Thiskindofsystemdemandsthatthedimensionsofmatingparsbespecified，andthatdimensionalvariations,duetomachineandoperatorshortcomings^betakenintoaccount.
4・Themagnitudeofthetolerancedependsuponthetypeofoperationinvolved,theskillofthemachinist，theaccuracyofthemachine^andthesizeofthepart^
5・Thetoleranceshouldbeaslargeaspossible.
II
6,公差与极限尺寸
7可交换性系统
8尺寸误差
9允许的最大误差
10单边极限
1・双边：
bilaterallimits
2间隙:
clearancefit
3ii:
interferencefit
4基轴:
shaft-basedsystem
5基孔:
hole-basedsystem
IIILThedifferencebetweenthecalledthe（maximumerrorspermitted）.
2.Forgivengrademustbe（increased）.3.（ground）Relapsed.S.scrape.
6interchangeable.7.specified"
•designated9.indicatedlO.specification
IV.1•显然，:
Itisobviousthatthetwopartswouldhavetoremaintogether,andintheeventofonehavingtobereplaced^thefittingwouldhavetobedonealloveragain*
2•具有:
Asystemofinterchangeabilityusuallylowerstheproductioncosts，asthereisnoneedforanexpensivenfiddlingnoperation,anditalsobenefitsthecustomerintheeventoftheneedtoreplacewornparts..
3•必须:
Someformofinspectionmustbeintroducedtoensurethatthemanufactureiscontrolled;
thisisparticularlyimportant^becausedimensionalerrorsmaynotberevealeduntilsometimehaselapsed^andoftenmanymilesfromtheplacewherethemachiningwasdone.
4•这:
Theextremedimensionsarecalledthelimitsofsize,andthedifferencebetweenthemiscalledthetolerance.
5•公差:
Themagnitudeofthetolerancedependsuponthetypeofoperationinvolved,theskillofthemachinist^theaccuracyofthemachineandthesizeofthepart
Ill1•鼠：
Squirrel-cageinductionmotorsareknownfortheirruggednessandlowercost.
2.Squirrel-cagemotorrequiresverylittlecontrolequipment.
3>
Wound-rotormotorrequiresadditionalsecondarycontroL
^Synchronousmaybeusedforalmostanyconstant-speeddriverequiringabout100hporover.
S.Synchronousmotorrequiresasourceofdeexcitationandspecialsynchronizingcontrol.
Exercises第7章
IX.Whatisthedefinitionofthetransducer?
Atransducerisadevicewhichconvertsthequantitybeingmeasuredintoanoptical,mechanicalormorecommonlyelectricalsignal.
2.Capacitanceinductancetransducers^magnetoelectrictransducers,thermoelectrictransducersandphotoelectrictransducer,etc.
Displacement^pressure^vibration,soundandliquidleveL
4.Naturalquartzcrystalsorbariumtitanateceramics.
5.Temperatureatlocalizedpointscanbedetermined,Theyarerobust,withawideoperatingrangefrom-250C-2?
000c.
II1•位移：
displacement2.thermocouple.3.resolution.4>
impedance.5.photovoltaiceffect.6.磁场。
7磁电式传感器。
8电位计。
9稳态响应。
10压电效应。
IIL1•压电：
Piezoelectricmaterialsgenerateanoutputchargeproportionalto
appliedforce.
2•磁电：
Magnetoelectrictransducersemploytheprincipleofacoilmovinginamagneticfield.
3•输出:
Inputvoltageisproportionaltothevelocityofoutputmotion.
4•热电:
Thisthermoelectriceffectiswidelyusedintemperaturemeasurementandcontrolsystem.
5•光电：
Thephotovoltaiccellisbasedontheprincipleofthephotovoltaiceffect.
Thesuccessofindustryinturningsucheffectivetechniquestoadvantagebydevelopinglow-costproductswilldeterminetheimpactwhichopticalfibershaveoncommunications.
3・Thetelephonesystemscanbedividedintothreenetworks:
thelocalnetwork^whichtiescustomerstotheirrespectivelocalswitchingoffices;
thetrunknetwork,whichinterconnectstheswitchingoffices;
thelong-distancenetworkbetweencities.
4.Whentherearemanytelephonecallstobecarriedbetweenpointssuchasswitchingoffices,fibersystemsareeconomicallyattractive.
5.
6•无线光学通信
7在一对一的基础上
8本地线路
9铜线
10传统通信服务
Largerfiberbandwidth,lowerlossandmorereliableopticalsourceswouldmakeopticalfibersmorecompetitive.
II1・光纤：
opticalfiber
2.1ight-wave-guidefiber
3•中:
switchingoffice
4.wirepair
5.Lowloss
IIILThepresentcompetition（hasshifted）thefibers.
2.Thetelephonesystemscan（bedivided）intothreenetworks.3.Benefitt4.inexpensive5>
compete6.suggest7.1oops8.technologypetelOwirepairs.
IV1•研究:
Moreove^studiessuggestthatthismaybethecaseforsometine.
2・Thustheinterofficetrunknetworkwillbethefirsttobenefitfromthisnewtechnology.
3.1nfact,varioustrunk・orientedcommunicationssystemsareunderconstructionorinoperationinmanyindustrializedcountries.
（Opticalfibershavetheadvantageofsmallcablesizeandweightandimmunitytolightningandotherelectromagneticinterference.
5.Afewopticalfibersdatalinksystemsarealreadyonthemarket^andmoreareunderdevel-opment.
Exercises第6章
Il.whatareadvantagedoftheinductionmotor?
Simplicity,economyanddurability^
2.Becauseoftheirruggednessandlowercost
3.1tismostusefulwhenahigh-speeddriveisdesired.
4.Wound-rotormotor
5.Costfactor.
II1•交流:
acmotor2Jnduction3・constantspeed.4・single・phase・5.continuoiis・
6•直流电动机。
7同步电动机。
8变速。
9便携式工具。
10电源
6•单边:
Unilatenillimitsareusuallyusedwhenthedistancebetweentwofaces,ofthediameterofdiameterofaholeorshaftisspecified.
Exercises第4章
I1・whatisthefunctionofamold?
Thefunctionofamodistworespects:
impartingthedesiredshapetotheelasticizedpolymerandcoolingtheinjectionmoldedpart,
2.Whatisthemoldmainlymadeupof?
Itisbasicallymadeupoftwosetso
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