rivets patch

7/28/2019 Rivets Patch

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AMT110

SheetMetal

HerbSpenner


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Introduc8on

[email protected](40)314-1610

GuidelinesGavilanCollegeFAA


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ClassRequirements

AC43-1B/2B AC65-15 Op8onalASATestGuidesandSoQware

GeneralandAirframeTestGuidebooksPrepwaresoQware

Safety

Glass

EarplugsGlovesCloths


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ClassRoomTools

Calculator Machinist'sRuler(1/32,1/64,1/100) Compass Rightangleortriangle Op8onal

GraphpaperComputer

TextbooksandhandoutavailableinsoQcopy


5/100

ShopTools

NostressrisersEnvelopexampleM&MTest

Usethecorrecttool Drillbits5each

#40bit0.9-#3rivet3/320.09375#30bit0.125-#4rivet4/32(1/)0.125#21bit0.159-#5rivet5/320.15625

CenterpunchAutoma8c-best


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ShopTools

Sharpie-UltraFine(nopencilformarking) File Scrapeofwood Op8onal

RivetGaugesOlddillbitdeburringClampsRive8ngtapeCaliperorMicrometerwww.aircraQspruce.com&www.yardstore.com


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LetsDoSomeMath


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Rivets

StartreadingAC65-15Chapter5-AircraQStructuralRepairs-page127

Repairsmustmaintaintheoriginalstrengthofthestructure.

Pop,Cherry,Solid SolidRivetHeads

Fig3.1Universal-AN470(MS20470)100CountersunkAN426(MS20426)flush


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RivetHeads


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RivetSqueezer


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RivetGun


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RivetGun


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RivetGunProcess

Selectset Selectandinstallsetretainer(spring) Adjustregulator Testregulatoradjustmentonwood

Nevershootgunwithnoload/intheair Testonasample


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SolidRivetMaterial

A1100Purealuminum B5056-Magnesium AD2117Mostcommontype D2017Icebox DD2024Icebox


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RivetMaterial


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RivetDimensioning

Diameterisin1/32s#33/32,#4-4/32(1/),#5-5/32

Lengthisin1/16AN470shaQlengthAN426fullrivetlength


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RivetDesigna8on

(HeadType)(Material)(Diameterin1/32s)(Lengthin1/16s)

Universalhead,2117,3/32diameter,5/16lengthAN470AD3-5orMS20470AD3-5

Countersunkhead,1100,1/(4/32)diameter,1/2(/16)length

AN426A4-orMS20426A4-


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DrillSizes

#33/32-#40drill #41/(4/32)-#30drill #55/32-#21drill


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ShopHeadDimensions

DRivetdiameter 1/2DHeight 11/2Wide Fig3.3


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RivetDiameter

DAtleast3XthethickestsheetorwhattheaircraQmanufacturerusedRemembertoconvertto1/32s

D3XsheetthicknessX32(conver8ngto1/32s) Sheetthickness-0.025

D=3X0.025X32=2.4->3 Sheetthickness0.032

D=3X0.032X32=3.072->4 Sheetthickness0.040

D=3X0.040X32=3.4->4


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RivetLength

Length=1.5XD+Totalthicknessofallsheets Length=(1.5XD+Sheet1+Sheet2...)X16

X16istoconvertto1/16sRemembertoaddallthesheets


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RivetLength

2Sheetsof0.0253/32rivet(1.5X3/32+0.025+0.025)X16=3.05->4AN470AD3-4orAN426AD3-4

2Sheetsof0.0321/rivet(4/32)(1.5X1/+0.032+0.032)X16=4.024->4or5AN470AD4-5orAN426AD4-5

2Sheetsof0.0401/rivet(4/32)(1.5X1/+0.040+0.040)X16=4.2->5AN470AD4-5orAN426AD4-5


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RivetLength

3Sheetsof0.0253/32rivet(1.5X3/32+0.025+0.025+0.025)X16=3.45->4AN470AD3-4orAN426AD3-4

Threesheets-0.025,0.032and0.040sheets#4rivetbecauseof0.040(1.5X1/+0.025+0.032+0.040)X16=4.552->5AN470AD4-5orAN426AD4-5


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RivetDimensions

DAtleast3XthethickestsheetorwhattheaircraQmanufacturerusedRemembertoconvertto1/32s

D3XsheetthicknessX32(conver8ngto1/32s) Length=1.5XD+Totalthicknessofallsheets

Remembertoconvertto1/16s Length=(1.5XD+Sheet1+Sheet2...)X16

X16istoconvertto1/16sRemembertoaddallthesheets


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RivetSpacing

Distanceismeasuredfromthecenteroftherivet

Edgedistance2to4D Distancebetweenrivets3to10DperAC43.13-1B

Handoutsays3to12


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ReadAC43-13.1BPar4-57Rive8ng


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RivetPlates

4X6

#3,#4and#5rivetplates 2Dedgedistance 6direc8onabout6D

4direc8onabout75%of6 Getpaperdesignapproved

Showmath


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RivetPlate-#4

D=1/=0.125

6sideDistancebetweenfirstandlast

62D2D=64D 64*0.125=5.5

Rivetspacingisabout6Dor0.75 5.5/0.75=7.3333(use7) 5.5/7=0.757=~25.1/32


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RivetPlate-#4

4side

Distancebetweenfirstandlast 42D2D=44D 44*0.125=3.5

Rivetspacingisabout75%of0.757 0.757X75%=0.593 3.5/0.593=5.9392(use6) 3.5/6=0.533=~1.6/32


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RivetPlate-#4


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RemainingTopics

Aluminumsheetmetalproper8es Bending Patchdesign Sheetmetalfasteners Flushrive8ng


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AluminumSheetMetalStrength

Alloys(e.g.1100,2024&6061)

Treatment/tempering Thickness Shape

Lookat43.12-1BPage4-Table4-5


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AluminumSheetHardnessTemper

Workhardening

WorkhardeningColdhardeningStrainhardening

Heattrea8ng/hardening Agehardening Lookat43.12-1BPage4-4


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MetalBending


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LayoutProcedure

1. Determinestocksizeorwheretocut2. Locatebrakereferencelinesorwheretobend3. Markcentersorwheretodrill


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Radius


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BendingBrake


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BendingBrake


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BendingBrake


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BendRadius


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NeutralLine


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Bend


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Defini8ons

MLDMoldLineDimensionthelengthofthesidefromtheedgetothecenterofaperfect

bend(0radius)

BTLDBendTangentLineDimensionthelengthofthesidefromtheedgetothebeginningofthebend

BABendAllowanceTheareathatwillbebent DevelopedWidthLengthofthematerialusedtomakebracket


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Bend


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SetBack

SBSetBackthedifferencebetweentheMoldLineDistanceandBendTangentLineDimension

SB=MLDBTLD


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BrakeReference

BrakeReference(Line)Thelinewerethebrakeislinedup


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OpenAngle

OpenAngleBentlessthan90

Page 3-19


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ClosedAngle

ClosedAngleBentgreaterthan90


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Non90Angles

SetBackK*(T+R)Kisfound5-25Apage150inAC65-15

BendAllowance:#ofdegrees*smallnumberin5-24page149inAC65-15


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Countersinking

From

AC65-15


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Countersinking


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Countersink


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MicrostopCountersinkCage


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Dimple


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Dimple

Also called a nest or well


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DimpleSet


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DimpleSet


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DimpleTool


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DimpleTools


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DimpleTools


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ColdDimpling

IfpossibleuseasmallerdrillsizeDiecanstretchtherivethole

Dontcolddimplehardmetal Coindimpling

UsingarivetasthemaledieUseanormalfemaledieinspecialbuckingbarBuckdimpleHardtoreachplaces


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ThermalDimpleTools


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ThermalDimpling

Heateddies Useforhardmetals

Reduceschangesofcracking7075-T6,magnesiumor8tanium

RadiusSolidfemaledie

CoinSlidingramfemaledieFormsamoreuniformdimple(nestorwell)


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ThermalDimpling


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Countersink/Dimple


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FlushRivetGuidelines


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PatchingSkinDamage

Stopdrillcracksorcutoutdamage.Leavenostressrisersnosharpcorners

Calculatethenumberofrivets Makeapaperdesignofapatch

Markholestoinsurenointerference Createapatch

SamematerialandsamethicknessorgreaterPatchwillgounderskinifpossible


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PatchingSkinDamage

Makefillerplugifneeded Drillholes Applycorrosioninhibitor/primer Rivet PrimeandPaint


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StopDrill


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RivetSpacing

Rivetpitch-thedistancebetweenthecentersofadjacentrivetsinthesamerow.

Minimum3D;Maximum10DTypical6DtoD

Transversepitch-theperpendiculardistancebetweenrivetrows

75%ofrivetpitchMinimum21/2D

EdgeDistance2Dto4D


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RivetSpacing


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RivetSpacing


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ElongatedOctagonalPatch

AC65-15Fig. 5-74Page 190


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ElongatedOctagonalPatch


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RoundPatch

AC65-15Fig. 5-76Page 191

d


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TurnDownEdge

AC65-15Fig. 5-77Page 192

l i


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PanelRepair AC65-15Fig. 5-78Page 192

P h Id


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PatchIdeasAC43.13

Fig. 1-15Page 1-29

P h Id


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PatchIdeas AC43.13Fig. 1-17

Page 1-32

Y G id


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YourGuides

Followmanufacturersinstruc8onsMaintenance/RepairmanualCopyholerivetpaernUsesamematerialandrivets

UseAC43.13-1BPar4-5 ReadAC65-1519-19

N b f Ri t


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NumberofRivets

When any kind of repair to an aircraft structure

is made. the basic requirement is to restore all

of the strength that has been lost. There must

be enough rivets on one side of the damage tocarry all of the required stresses into the patch,

with enough rivets on the opposite side to put

the stresses back into the skin.

N b f Ri t AC65 15


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NumberofRivets-AC65-15

#Rivets=LengthofCrackXThicknessofMetalShearStrength

N=LXT/ShearStrength BooksaysShearorBearingstrength,whicheverislessAgoodjointshouldbebasedonShearstrength

Userfig5-1forShearstrengthorfig5-2forBearingstrength(page12or129)

N b f Ri t AC43 13 1B


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NumberofRivetsAC43.13-1B

UseTables4-9,4-10or4-11forrivetsperinch.Page4-37,4-3or4-39

#Rivets=LengthofcrackXRivetsperinch #Rivetsisonlyforoneside. Therivetusedis2X#Rivets

C k


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Crack

P t h


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Patch

Bli d Ri t


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BlindRivets

AlsocalledMechanicallyExpandedRivet Installedbypullingonrivetstem

InstalledwithapullingtoolBlindRivetneedtoaccessonlyonsideNohammering

Usedwithsomeplas8csandplywood Nonstructural

Poprivet

StemdoesntaddstrengthCommonlyusedforenginebafflingandinteriors

St t l Ri t


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StructuralRivets

CherryRivets CherrylockorHuck ShaQmechanicallylocksinsiderivetandcreatesthestrengthoftherivet

Cherry2000onesizelargerthansolidrivet CherryMaxor3000samesizeassolidrivet

Onlyblindrivetinterchangeablestructurallywithsolidrivets

hp://www.cherryaerospace.com/images/anima8ons/cherrymax/CherryMax_100MS.swf

Structural Rivets Dimension


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StructuralRivetsDimension

Diameterin1/32sAlsoavailableinoversize1/64over

Lengthin1/16sAlsospecifiedingriplength

Rivetspecifiedlikesolidrivetse.g.4-3or5-4

Structural Rivets Grip


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StructuralRivetsGrip

Structural Rivets Heads


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StructuralRivetsHeads

Remove Blind Rivet


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RemoveBlindRivet

Hi Shear


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Hi-Shear

Samestrengthasabolt Lesslabortoinstallthanabolt Lighterthanabolt Needsveryspecializedtools

Hi Lok


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Hi-Lok

LikeHi-Shearbutcanbeinstalledwithstandardtools

Allenwrenchandsocket/boxwrench

Turnlock Fasteners


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TurnlockFasteners

Aachinspec8onpanels,cowls,andfairings Selfcontainedhardware Halfturnonoroff Limitedshearandbearingstrength

Dzus


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Dzus

Camloc


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Camloc

Airloc


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Airloc

Nutplates


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Nutplates

Rivnut


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Rivnut

rivets patch

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