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.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
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