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4300Catalog Assembly/Installation ToolsforTubeBending/MandrelBending Toolsfor0 TubeBending MandrelBendingTools Forsmooth,wrinklefreetubebendingwithoutexcessiveflatten- Whenbendingthinwalltubeitmaybenecessarytoinserta ing,thereareanumberofbendersthatcanbeselected.Consult135mandrelintothetubetopreventexcessivedistortion,flatten- thespecificbender'sinstructionbulletinsforCLR(centerline ing or wrinkling. To determine whether mandrel bending is radius),wallthickness,andtubematerialrecommendationsand required,seetheMandrelBendingRequirementsChartand limitations.Forcrankandhydraulicbenders,utilizeboththe examplebelow. mandrelbendingdeterminationchart(Fig.T56)andtheParker Toaccomplishsuchbending,amandrel,mandrelrod,anda BenderCapacityGuidesonpageS7. mandrelrodstopassemblyarerequired.Therodstopassembly 1. Handheldlevertypebenders(seepagesS4-S6). holdstheendofthemandrelrodinproperalignmentwiththe Individuallysizedfortubesizes1/8"through1"and6mm tubewhilethemandrel,whichisthreadedontotheotherendof through25mm. themandrelrod,supportsthetubeonitsI.D.,thuspreventing tubekinkingorflatteningduringbending. MandrelBendingRequirementsChart 14 0 9045 135 Plug 90 45 13 Mandrel OneBallMandrel 12 NoMandrel 11 Fig.T53--Handheldtubebender 10 9 CenterlineRadius(CLRAD) Ratioof OutsideDiameter(OD) 8 TK 2. Manualcrank,tablemountorvisemountbenders: 7 CLRAD 1) Model412(pageS8).Forbending1/4"through 6 3/4"O.D.tubeor6mmthrough20mm. 5 2) Model424(pageS9).Forbending1/4"through 4 11/2"O.D.tubeor6mmthrough38mm. 3 MultipleBallMandrel 2 1 NotPractical 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 OutsideDiameter(OD) Ratioof Wall Thickness(TK) Fig.T54--Manualcrankbender Fig.T56--Mandrelbendingrequirementschart Example:Determineifit'snecessarytousemandrelforbending 3/4x.049steeltubethrougha3"bendradiuswithoutexces- O.D. siveflattening. 3. Hydraulicallypoweredbender Model632(pageS12).Forbending3/8"through2"O.D. CenterlineRadius/TubeOutsideDiameter=3/.75=4 tubeor10mmthrough50mm. OutsideDiameter/WallThickness=.75/.049=15.3 Intersectionofthesetworatiosonthegraphfallswithinthearea indicatingthatnomandrelisrequired.Note,however,thatfor thesametubeO.D.atasmallerbendradius(e.g.2")orwitha thinnerwallthickness(e.g..035"),amandrelwouldberequired forpreventingexcessiveflattening. Ifthetubewallisverythin,thenaplugmandrelalonemaynot beadequatetopreventwrinkling.Insuchcases,specialball typemandrelsandwipershoesmaybenecessary(SeeFig. T57forillustrationsofplugandballtypemandrels).Asarule ofthumb,ifthetubewallthicknessislessthan7%ofthetube O.D.thenmandrelbendingisrecommended. Fig.T55--Hydraulicbenderwithportabletableformandrel bending Dimensionsandpressuresforreferenceonly,subjecttochange. T39 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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