Gear 511分析和总结分析和总结.docx

5.1.1ProfileCorrections

Anglechangesorchangesintheflankprofileformareperformedthroughangleandformchangesonthebladecuttingedgebecausethisoccursdirectlyontheflank.

Forchangesinprofiledirection，acorrectionvalueΔZG(positiveonpinionroot)isgiven.

Fromthis,thecorrectionangleiscalculatedwith

andthecutterheadradiuschangewithThefunctionequation

(5.4)

appliestotheresultingcorrectionsurface.

ForalloftheCorrectioneffectstreatedhere,examplecalculationsusingthederivedmachinesettingchangeswerecalculatedwiththeprogramchainforbevelgearcalculationonthebasisoftheexactreferencegear(Figurel).AnexampleforprofilecorrectionisshowninFigure4，left.TheAZGvaluewasgivenhereas0.15mm.

Figure:4Flankprofilecorrections

Crowningrequiresasphericalbladeprofile,thatis,thealterationofanexistingbladespherics.Toobtainpositivecrowning(HB),thenewsphericradiusis:

(5.5)

Thecorrectionsurfaceofthecrowning(recalculatedasanexamplewithHB=0.08mminFigure4,right)hasthefunctionequation:

Thegivenfunctionequationsrefertoacoordinatesystemoriginatingatthedesignpoint.

i.e.usuallyatthepointofconcentrationonthesurfaceoftheprojectionplane.

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