机械外文翻译文献翻译影响工件表面质量的因素.docx
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机械外文翻译文献翻译影响工件表面质量的因素.docx
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机械外文翻译文献翻译影响工件表面质量的因素
英文原文
Influencefactorsonthequalityoftheworkplacesurface
Processingprocessonthesurfacequalityoftheinfluence
Thevibrationoftheprocesssystemoftheinfluenceonthequalityofthesurface
Inmechanicalprocessingprocesstechnologysystemsometimesoccurvibration,thatis,inthecuttingedgetoolandworkplaceiscuttingsurfaceexceptonthenamebetweencuttingmotion,butalsocanappearacyclicalrelativemotion.
Vibrationthatprocesssystembyformingmovementoftheinterferenceanddamage,makeprocessingsurfaceappearchattermarks,increasesthesurfaceroughnessvalue,worseningprocessingsurfacequality.
Cuttergeometricalparameters,materialsandcuttingqualitytothesurfacequalityoftheinfluence
ThecuttingtoolgeometricparametersonthesurfaceroughnessofthebiggestinfluenceisvicePianJiao,themainpointPianJiao,arcradius.Undercertainconditions,reducePianJiao,Lord,vicePianJiaopointarcradiuscanreducesurfaceroughness.Underthesameconditions,carbidecuttingtoolsprocessofsurfaceroughnessvaluelessthanhighspeedsteelpapercuttingknife,anddiamondandCBN)toolsandbetterthanhardalloy,butbecausethediamondandironfamilyaffinitymaterials,itshouldnotbeusedforprocessingironfamilymaterials.Inaddition,thecuttingtoolbeforeandaftertheface,cuttingknifebladeitselfdirectlyinfluencetheroughnessoftheprocessingtheroughnessofthesurface,therefore,improvethequalityofcuttingtool,cuttingtoolandface,cuttingknifebladeroughnessvalueshouldbelowerthantheroughnessofthe1~2levels.
Cuttingfluidtotheinfluenceonthequalityofthesurface
Cuttingfluidcoolingandlubricationeffectcanreducethecuttingprocessofinterfacefriction,reducethetemperatureofcuttingzone,thecuttingmetalsurfacelayerofplasticdeformationdegreedown,restrainthedevelopthethornandscalesproducedintheproductionofdifferentmaterialsforreasonablechoiceofcuttingfluidscanreducethesurfaceroughness.
Theworkplacematerialonthesurfacequalityoftheinfluence
Theworkplacematerialnature;Processingplasticmaterials,thecuttingtoolsformetalextrusionproducedplasticdeformation,andthecuttingtoolandworkplaceforcedseparationofthetornscrapseffect,makethesurfaceroughnessvalueincrease.Theworkplacematerialtenacitythebetter,metal,plasticdeformation,thebiggertheprocessingsurfaceisthemoretherough.Processingbrittlematerialinthechipbrokengranular,duetothecollapseinbrokenandendowsthemachinedsurfaceleftmanypittedsurfaceroughness.
Generaltoughnesslargeplasticmaterials,processingafterlargesurfaceroughness,andtoughnessofsmallerplasticmaterials,processingtogetsmallerafterthesurfaceroughness.Forthesamekindofmaterial,thegreaterthegrainsizeoftheorganization,thelargerthesurfaceroughness.Therefore,inordertoreducethesurfaceroughness,oftenincuttingprocessingofmaterialbeforequenchingandtemperingoristhefireoftreatmenttoobtainhomogeneousfinegrainorganizationandhighhardness.
Cuttingconditiontheinfluenceonthequalityofthesurface
Andcuttingconditionoftherelevantprocessfactors,includingcuttingdosages,coolinglubrication.Inlowspeedprocessingplasticmaterials,,easytoproducethedevelopandscalesthorn,so,improvethecuttingspeed,canreducethedevelopandscalesthorn,decreasingpartalreadythesurfaceroughnessvalue;Forbrittlematerial,generalwon'tformthedevelopandscalesthorn,so,cuttingspeedonthesurfaceroughnessbasicallynoinfluence.Theincreasespeed,plasticdeformationalsoincreases,thesurfaceroughnessincreases,so,reducethespeedcanreducethesurfaceroughnessvalue,however,feedingreducedtocertainvalue,roughnesswon'tobviouslydecreased.Normalcuttingconditions,cuttingdepthonthesurfaceroughnesstheimpactisnotbig,therefore,mechanicalprocesscannotselectthetoosmallcuttingdepth.
Cuttingspeedonthesurfaceroughnessinfluence
Generalattheearlychooselowspeedcuttingandfinishingchoosehighspeedcuttingcanreducethesurfaceroughness.Inthemediumspeedcuttingplasticmaterials,duetoeasytoproducethedevelop,andplasticdeformationisbigger,soafterprocessingpartssurfaceroughnessisbigger.Usuallybyloworhighspeedcuttingplasticmaterial,caneffectivelyavoidthedevelopofgeneration,thistoreducetableandroughnesshavepositiverole.
Onthesurfacequalityofthegrindingeffects
Theinfluenceofthegrindingwheelgrindingwheelgranularitythethinner,perunitareagrainnumbergrinding,themoreofthegrindingsurfaceinfinescratchesthesurfaceroughnessissmall;Butiftoofinegranularity,processingtojamwheelitwillincreasethesurfaceroughness,alsoeasytoproducetherippleandcauseburns.Thehardnessofthegrindingwheelshouldbetherightsize,itshalfthelongerthebetterpassivationperiod;Thehardnessofthegrindingwheelistoohigh,grindingmillisnoteasytofalloffwhengrain,makeprocessingsurfaceisoffriction,extrusionactionintensifies,thusincreasingtheplasticdeformation,makingthesurfaceroughnessincreases,alsoeasycauseburns;Butthegrindingwheelistoosoft,gritstooeasytofalloff,canmakegrindingactionisreduced,leadingtothesurfaceroughnessincreases,sotoselecttherightgrindingwheelhardness.Grindingwheeldressingthehigherthequality,thesurfaceofthegrindingwheelcuttingtheblade,cuttingthenumberofallthemorethebetterofthebladecontoursex,grindingsurfaceroughnessandsmaller.
Theinfluenceofthegrindingwheelspeedincreasedosage,unittimethroughtheprocessingofgrindingsurfacegrainnumberincrease,eachstargritsisgroundtoreducethicknessofthemetal,thesurfaceareaoftheresidualreduced;Andatthesametime,improvethegrindingwheelspeedcanalsoreducetheworkplacematerialofplasticdeformation,thesecanmakeprocessingsurfaceroughnessvaluereduced.Reducethespeed,unittimethroughtheprocessingofgrindingsurfacegrainnumberincrease,thesurfaceroughnessdecreased;Butthelowspeed,workplaceandgrindingwheelcontacttimelong,tothequantityofheatoftheincreasing,oppositewillincreasetheroughness,mayalsoincreasesurfaceburn.Increasegrindingdepthandlongitudinalfeeding,theplasticdeformationincrease,willleadtothesurfaceroughnessvalueincrease.Radialfeedingincrease,thegrindingprocessgrindingforceandgrindingtemperaturewillincrease,grindingsurfaceplasticdeformationdegreeincrease,whichwillincreasethesurfaceroughness.Toguaranteethemachiningqualityinthepremiseofgrindingefficiencyincrease,willrequireahighersurfacethecoarsegrindingandfinegrindingseparately,coarsegrindingisusedwhenthebigradialdirectionfeeding,finegrindingtheradialfeedingthesmallerwhen,finallywithoutintotogrinding,togetthesurfaceroughnessofsurfaceisverysmall.
Theworkplacematerialtheworkplacematerialofhardness,plasticandthermalconductivityonthesurfaceroughnessofbigeffect.Largeplasticsoftmaterialeasyjamgrindingwheel,thermalconductivitypoorheatresistantalloyeasyfortheabrasiveearlycaving,willleadtoincreasedgrindingsurfaceroughness.
Inaddition,becausegrindingtothehightemperature,reasonableusecuttingfluidscanreducethegrindingoftemperature,reduceburns,canalsorushedtofalloffthegritsandscraps,avoidscratchworkplace,soastoreducethesurfaceroughness.
Affectthesurfaceofphysicalandmechanicalpropertiesoffactors
Surfacelayercoldhardening.Thecuttingedgesobtuseradiusincreased,andthesurfaceofmetaltheextrusionofenhanced,plasticdeformationintensifies,coldhardtostrengthen.Aftercuttingtoolknifesurfacewearincreases,theknifesurfaceandafterprocessedsurfacefrictionintensified,plasticdeformationincrease,coldhardtostrengthen.Cuttingspeedincrease,cuttingtoolandworkplaceroletimeisshortened,makeplasticdeformationexpandthedepthdecreases,andcoldhardlayerdepthdecreases.Aftercuttingspeedincrease,heatcuttinginthesurfacelayereffecttimealsoshortened,willmakecoldharddegreeincrease.Feedingincreases,cuttingforcealsoincreased,andthesurfaceofthemetalplasticdeformationintensifies,coldhardeffectisstrengthening.Theworkplacematerialofplasticislargerandthecoldhardphenomenontheserious.
Surfacelayermaterialmetallographiccompositionchange.Whencuttingtheheatwasprocessingsurfacetemperatureofphasechangeaftermorethantemperature,thesurfaceofthemetalmicrostructurewillchange.Grindingburnswhenasurfacetemperatureofphasechangetomillerstemperatureabove,metalsurfacemicrostructureoccurredchange,makethesurfaceofthemetalstrengthandhardnessofthelower,andwithresidualstressproduceappearevenmicroscopiccracks,thisphenomenoniscalledgrindingburns.Improvegrindingburnsgrindingheatcausedbygrindingwayistherootoftheburn,soimprovinggrindingburnsbytwoways:
oneisasfaraspossibletoreducethegenerationofgrindingheat;2itisimprovedcoolingcondition,makeasfaraspossiblethequantityofheattoproducelessworkplace.Thecorrectchoicegrindingwheelreasonablechoiceofcuttingdosagesimprovedcoolingconditions.
Surfacelayerresidualstress.Produceresidualstressofreason:
cuttinginprocessingthemetallayerandthesurfacewhentherewereplasticdeformationoccurs,thesurfaceofthemetaltohematocritincrease;Cuttingprocessing,cuttingareawillhavealotofheatcuttingproduce;Differentanalysisofmetallograp
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