内齿轮在滚齿机 FD250 上制造的可能性外文文献翻译中英文翻译外文翻译.docx

内齿轮在滚齿机 FD250 上制造的可能性外文文献翻译中英文翻译外文翻译.docx

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内齿轮在滚齿机FD250上制造的可能性外文文献翻译中英文翻译外文翻译

INTERNALGEARSMANUFACTURINGPOSSIBILITYONTHEGEAR

HOBBINGMACHINE“FD250”

SandorRAVAINAGY,NorthUnivrsityofBaiaMare,Romania

GaborLaszloPAY,Ph.D.,CollegeofNyiaregyhaza,Hungary

Abstract:

ThepaperpresentsthepossibilitytomodifytheFD250gearhobbingmachine,withadevice,inamachineapplytomanufacturinginternalgears.Redesignedandequippedwithdeviceitispossibletoobtainamachinetoolwithhigheruniversalityandapossibilitytodecreasethemanufacturingpricefortheinternalspurandhelicalgear.

Keywords:

Internalgears,gearhobbingmachine,design,device.

1.INTRODUCTION

Thepaperpresentsthepossibilitytomanufacturetheinternalcylindricalgearsonthegearhobbingmachines.Tothepresentalmostallinternalgearswhatismanufacturedwithmetalcuttingmethodsareusethegearshapingprocedures.

Withthepresentedsolutionitispossibletoeliminatesomeproblemswhatpresupposethegearshapingmethods.Incasewhenit’smanufacturedhelicalgearforeachhelixanglethegearshaperneedavaried3Dcam.This3Dcampresentsmanytechnicalproblemswhenaremanufacturedandhisprecisionhasdirectinfluenceonthegearprecision.Onthefinancialsidethegearhobbingmachinearecheaperandhisproductivityarehigher.

2.APPLICATIONAREA

Thismethodandthedevicefindapplicabilityinbranchofgearmanufacturefirmsincasewhenitisneedstoobtaingearsforprototypeandsmallseries.Concomitantlyisapossibilitytoinvestintheexistingmachinestogrowththemachinesproductivity.

Withthepresenteddevicetheuniversalityofmachinesaregrowledanditissucceedingtomanufactureonthesamemachinedifferedtypesofgears.

3.THE“FD250”GEARHOBBINGMACHINE

TheFD250gearhobbingmachine（Figure1.）wasdesignedbytheCugirMechanicalFactoryabletomanufacturespurandhelicalgearswith250-300mmmaximaldiameterandm=6mmmaximalmodule.Onthismachineitispossibletomanufactureallwork-piecewiththegeneratingmethodinthepresentedlimits.Forhobthemaximaldimensionsarethefollows:

Dh=105mm,Lh=100mm（hobdiameterandlength）.

Fig.1.TheFD250gearhobbingmachine

4.THE“FD250”HOBBINGMACHINEMODIFYTOBYABLEMANUFACTUREINTERNALSGEARS

Toeffectuatethecuttingprocedurethecuttingtoolsmustbypositionedinsideofthedonutformwork-piece.Forthisthekinematicschainofprimarymotionforthehobmustbytoprolong.Thisproposedmodificationandtheoriginalkinematicschainarepresentedin（Figure2.a.respective2.b.）

Fig.2.a.ThemodifiedkinematicschainFig.2.b.Theoriginalkinematicschain

Inconformitywiththeadoptedmanufacturingmethodform-copyingmethodorgeneratingmethodinkinematicschainofindexingmustintroduceamanuallyindexingdeviceforformcopyingcase.

Afteradimensionalanddesignstudythefollowpossibilityformodificationareidentified:

1-Theworkpieceisfixedontherotary-tableandthecuttingtoolindevicethatintroduceinsideontheworkpiece,withoutmodifiedtherearcolumn.（Figure.3.）

Fig.3.Hobbingmachinewithoutmodifiedtherearcolumn

Thissolutionisapplyingincaseofworkpiecewithexternaldiameterunder330mm,becausetherearcolumnlimitstheworkpiecedimensions.

2-Theworkpiecesarefixedontherotary-tableandthecuttingtoolindevicethatintroduceinsideontheworkpieceandtherearcolumnaredismantling.（Figure.4.）

Fig.4.Hobbingmachinewithdismantledrearcolumn

Inthiscaseit’spossibletomanufactureworkpiecewith800-850mmmaximumdiameter.Butinthiscasemustbyaccordedaseveralattentionforwhatcuttingdataarechoiceforavoidtheoverrequirethekinematicschainofindexing.ItisimportedtonotforgetthatFD250aredesignedforcuttingdataadequateforworkpiecewithmaximaldiameter250-300mm.

Theworkpieceisfixedontherotary-tableofgearhobbingmachinewithjawchurchorwithfaceplate,independsonhisdimension.

5.USEDCUTTINGTOOLS

Thepossibleusedcuttingtoolsarethefollowings:

-Gear-toothsidemillingcutter,incasewhentheinternalgeararemanufacturedwiththeform-copyingmethod,toothspacebytoothspace.（Figure.5.）

Thetoolsprofileisobtainingsimilarwiththeprofileforexternaldears,takinginconsiderationthecontactbetweenthegearsingearingareconvex-concave.

Fig.5.Gear-toothsidemillingcutterFig.6.Ellipsoidhobandflyhob

-Ellipsoidhob（Figure.6.）andflyhob,incasewhentheinternalgearsismanufacturedwiththegeneratingmethods.

Withtheellipsoidhobandflyhobitispossibletogeneratewormwheelfortheinternal

worm.

6.DEVICEFORTHECUTTINGTOOLSFORMANUFACTURINGINTERNALGEARSANDWHEELS.

Theproposeddeviceforasimplyusemustbydesignedthusthatdonotmodifythecalculusmethod