中英文翻译--工业机器人-精品.doc

中英文翻译--工业机器人-精品.doc

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Industrialrobots

Therearevarietyofdefinitionsofthetermrobot.Dependingonthedefinitionused,thenumberofrobotinstallationsworldwidevarieswidely.Numeroussingle-purposemachinesareusedinmanufacturingplantsthatmightappeartoberobots.Thesemachinesarehardwriedtoperformasinglefunctionandcannotbereprogrammedtopreformadifferentfunction.Suchsingle-purposemachinesdonotfitthedefinitionforindustrialrobotsthatisbecomingwidelyaccepted.thisdefinitionwasdevelopedbytheRobotInstituteofAmerica.

Arobotisareprogrammablemultifunctionalmainipulatordesignedtomovematerial,parts,tools,orspecializeddevicesthroughvariableprogrammedmotionsfortheperformanceofavarietyoftasks.

Notethatthisdefinitioncontainsthewordsreprogrammableandmultifunctional.Itisthesetwocharacteristicsthatseparatethetureindustrialrobotfromthevarioussingle-purposemachinesusedinmodernmanufacturingfirms.Theterm“reprogrammable”impliestwothings:

Therobotoperatesaccordingtoawrittenprogram,andthisprogramcanberewrittentoaccommodateavarietyofmanufactureingtasks.

Theterm“multifunctional”meansthattherobotcan,throughreprogrammingandtheuseofdifferentend-effectors,performanumberofdifferentmanufacturingtasks.Definitionswrittenaroundthesetwocriticalcharacteristicsarebecomingtheaccpteddefinitionsamongmanufacturingprofessionals.

Thefirstarticulatedarmcameaboutin1951andwasusedbytheU.S.AtomicEnergyCommission.In1954,thefirstprogrammablerobotwasdesignedbyGeorgeDevol.Itwasbasedontwoimportanttechnologies:

（1）Numericalcontrol（NC）technology.

（2）Romotemanipulatortechnology.

Numericalcontorltechnologyprovidedaformofmachinecontrolideallysuitedtorobots.Itallowedforthecontrolofmotionbystoredprograms.Theseprogramscontaindatepointstowhichthesequentiallymoves,timingsignalsinitiateactionandtostopmovement,andlogicstaementstoallowfordecisionmaking.

RemotemanipulatortechnologyallowedamachinetobemorethanjustanotherNCmachine.Itallowedsuchmachinestobecomerobotsthatcanperformavarietyofmanufacturingtasksinbothinaccessibleandunsafeenvironments.Bymergingthesetwotechnologies,Devoldevelopedthefirstindustrialrobot,anunsophisticatedprogrammablematerialshandlingmachine.

Thefirstcommericallyproducedrobotwasdevelopedin1959.In1962,GeneralMotorsCorporation.ThisrobotwasproducedbyUnimation.Amajorstepforwordinrobotcontroloccurredin1973withthedevelopmentoftheT-3industrialrobotbyCincinnatiMilacron.TheT-3robotwasthefirstcommerciallyproducedindustrialrobotcontrolledbyaminicomputer.

Numericalcontrolandremotemanipulatortechnologypromptedthewide-scaledevelopmentanduseofindustrialrobots.Butmajortechnologicaldevelopmentsdonottakeplacesimplybecauseofsuchnewcapabilities.Somethingmustprovidetheimpetusfortakingadvantageofthesecapabilities.Inthecaseofindustrialrobots,theimpetuswaseconomics.

Therapidinflationofwagesexperiencedinthe1970stremendouslyincreasedthepersonnelcostsofmanufacturingfirms.Atthesametime,foreigncompetitionbecameaseriousproblemforU.S.manufacturers.Foreignmanufacturerswhohadundertakenautomationonawide-scalebasis,suchasthoseinJapan,begantogainanincreasinglylargeshareoftheU.S.andworldmarketformanufacturedgoods,particularlyautomobiles.

Throughavarietyofautomationtechniquesincludingrobots,Japanesemanufacturers,beginninginthe1970s,wereabletoproducebetterautomobilesmorecheaplythannonautomatedU.S.manufacturers.Consequently,inordertosurvive,U.S.manufacturerswereforcedtoconsideranytechnologicaldevelopmentsthatcouldhelpimproveproductivity.

Itbecameimperativetoproducebetterproductsatlowercostsinordertobecompetitivewithforeignmanufacturers.Otherfactorssuchastheneedtofindbetterwaysofperformingdangerousmanufacturingtaskscontributedtothedevelopmentofindustialrobots.However,theprincipalrationalehasalwaysbeen,andisstill,improvedproductivity.

Oneoftheprincipaladvantagesofrobotsisthattheycanbeusedinsettingsthataredangeroustohumans.Weldingandpartingareexamplesofapplicationswhererobotscanbeusedmoresafelythanhumans.Eventhoughrobotsarecloselyassociatedwithsafetyintheworkplace,theycan,inthemselves,bedangerous.

Robotsandrobotcellsmustbecarefullydesignedandconfiguredsothattheydonotendangerhumanworkersandothermachines.Robotworkenvelopsshouldbeaccuratelycalculatedandadangerzonesurroundingtheenvelopeclearlymarkedoff.Redflooringstripsandbarriescanbeusedtokeephumanworkersoutofarobot’sworkenvelope.

Evenwithsuchprecautio