在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译.docx

在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译.docx

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在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译

外文原文：

Rollingconditionsinhotstripmillsandtheirinfluenceontheperformanceofworkrolls

Summary.Themechanicalrollingconditionsinhotstripmillsarepreciselydefinedbyvariables,whicharetakendirectlyfromtherollingscheduleseperationforce,torque,speed,stripthickness）orcalculatedfromfiguresoftherollingscheduleanddimensionsofthemill（stripreduction,rolldiameteretc）.Thesevariablesallowtodescriblethemechanicalrollingconditionsofallpassesinroughingandfinishingmills.Thesevariablesshouldbesupplementedbythemetallurgicalrollingconditions.Theythengivebasicinformationontheconditionswhichdeterminewear（specificload,wearspeed）andfirecrazing（co-efficientofheatpenetrationetc）.

Thereisagoodchancetousetheexperiencesofothermillswithvariousrollgradesbyanalogcomparison-aslongastherollingconditionsaresimilar.Thismethodislimitedby“abnormalrollingconditions”,whichrequiretotallydifferentrollgrades,althoughifitwouldbemuchbettertoeliminatetheabnormalconditions.

Introduction.inhotstripmills,slabsof150to250mmthickarerolledtostrip1.5to12mmthick.Conventionalhotstripmillsconsistofroughingandfinishingstands.Theconfigurationoftheroughingmillsvarieswidely.Amillwithonereversingstandandoneortwocontinuousroughingstandsiscalleda%conditionsmillandamillwith4to6conditionsroughingstandsiscalledacontinuousmill.

In3/4continuousandcontinuousmills,thefirststandsareusuallytwohighstandswhiletheremainderare4highstands.Inadditiontothesehorizontalstands,severaledgersarealsoused.Thefinishingmillshaveaminimumof4standsbutnormallyhave6to7stands.

Rollingconditionsvaryfrommilltomill,standtostandandpasstopass.Millconfigurationsaredesignedforadesiredtotalstip（thickness）reduction,however,eachstandislimitedinstripreductionbythemaximumseparationforce,maximumtorque,riskofslippageetc.

Inordertosupplythecorrectrollforeachmill,rollmakersaskfordetailsoftherollingconditionsandanyspecialcircumstances.However,howtousethisinformation?

HowtocomparetheconditionsofpassNo.XandNo.X+?

?

?

Therehavemanydiscussionsovertheyearsbutrarelyanyreallygoodresultswiththesecomparisons.

Forexample,lookingatroughingmillworkrolls,therearesomanyrollgradesbeingusedindifferentmillsthatitisevidentthattheoptimumgradetoyieldthemaximumqualityforallapplicationshasnotyetbeenfound.

Todate,notheorieshavebeenproved.Infact,inmanyinstancesthecombinationofexperienceandrollperformanceinthemillsistotallycontrarytothetheoriesofyesterdayandtoday.

Eventhefinesttheorydoesnothelpifarollgradefails：

→“Banding”inroughingstandsnevercreatedproblems,butthehandingprobleminfinishingmillshasnotbeensolvedbyanyrollgrade.Andthereislittlehopeforchangeinfuture.

→Thereisnotsingleoutstandingqualityforroughingmillswhichout-performsallotherqualitiesineveryapplication.Thisisbecauserollingconditionsvarywidely.

Inthispaperanattemptismadetoidentifysomevariableswhichareindependentonthemillandthepassesintheymill，andthentoanalysetile“rollingconditions”.Thebasesfortheseanalyticalstudiesareactualrollingschedulesforsimilarstripdimensionsandqualitiesfromdifferentmillsandexperiencewithdifferentrollgradesinthesemills.Wehavetoidentifythedifferentvariablesforeverystandandeverypassandthentrytofindtherelationshipbetweenthesevariablesandtheperformancefigurefordifferentrollgrades.Allinformationaboutspecialpracticesinthemillsforproducinggoodstripprofileandflatstrip,whichareofhighimportanceformillpeople,arenotconsideredbecausetheyprobablyhavenoinfluenceonthechoiceofthecorrectrollgrade.Theinitialideawastoanswerallquestions，tosolveallproblemsbyhavingrulesforrollwearandfirecrazing.Weveryquicklyfoundthatthiswasimpossible.Evenwiththemostsophisticatedmethods,becausewecanonlystudy“normalrollingconditions”andeveryoftenthesocalled“abnormalconditions”areeverydayoccurrences.Andonlythesimplefiguresfromtherollingschedulesareavailableandnoactualinformationonloads.torqueortherealtemperaturedistributiononstripandrolls，nothingaboutchangeofthetotalrollingprogram（length,coffinshape….）

Thereforewewilltrytodefinetherulesfornormalconditionsandtheotherproblem,toeliminatethe“abnormalconditions”，isuptothemillpeople.Wehavetoprovehowgoodourvariablesforrollingconditionsareandhowtheyareaffectedbytile“abnormalconditions”.

Rollingconditionsandtheoreticalbackground.Therollingconditionsaredirectlyrelatedtotileconfigurationoftile