ludeca blog » mission_ possible! flatness measurement of hp turbine shell
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Mission:Possible!FlatnessMeasurementofHPTurbineShellJune6,2011Tags:flatnessmeasurement,hpturbineshell,surfaceflatness
Recently,aflatnessmeasurementwasneededontwohalvesofanHPturbineshellusingLEVALIGNsystem.Thetophalf(restingupsidedown)wasatypicalquickandeasymeasurement,asshownbelowinFigure1:
Figure1
Thesecondhalf,wasnotsotypical.Thestudshadtoremainintheshellandthecustomerwonderedifourtoolcouldstilltakethemeasurementwiththelineofsightobstructionsforthelaserfromthestuds.TheanswerwasYES!
TheuniqueInfiniSplicefeatureoftheLEVALIGNallowedforthistohappenwithouthavingtoresorttocustombracketstoshootoverthetopofthestuds.InfiniSpliceallowsformultiplesetsofmeasurementstobecombinedintooneunifiedmeasurement.Thisisbasedontheconceptthattwosetsofmeasurementscanbeunifiedormergediftheyhavethreeormorepointsmeasuredincommon.
Itssimple.JustmeasureasmanypointsasyoucanwiththeLEVALIGNlaseremitterinthefirstposition.SeeFigure2.
Figure2
Thenmovethelasertoanotherpositionandmeasureanypointsyoucouldntmeasurewiththefirstmeasurementsetupplusatleastthreepointsthatyoudidmeasurewiththeprevious
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setup.SeeFigure3.
Figure3
Nowmovethelaseryetagain,andrepeatmeasuringtheremainderofthepointsplusthreepointsfromeitherthefirstorsecondmeasurement.SeethethirdsetupinFigure4.Thisprocesscanberepeatedasmanytimesasneeded,hencethetermInfiniSplice.
Figure4
Justopenallthree(ormore)filesintheALIGNMENTCENTERsoftwareandtheyaretheninstantlycombinedintooneunifiedmeasurement.Noneedtoselectthesplicepoints,thesoftwareknowswhichonestouse.Ifyoucanopenthreefiles,youcaninstantlysplicethem.Itsjustthatsimple.
Figure5showsthecombinedflatnessprofileofthelowerhalfoftheturbinecasing,takeninspiteoftheobstructionspresentedbyallthestuds.
Figure5
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