Gear 41分析和总结分析和总结.docx

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4.1Calculationinterfacesandflankgeneration

Forthegenerationofbevelgearflankgeometr,ythebasicgearcuttingmodelisprepared

inaformwellsuitedforadaptationtotheknownbevelgearmachines.Figure3illustratestheconfigurationofthecoordinatesystemsofthebevelgearcuttingmodelforsimulationofGleasonmachines.

Inordertoassureauser-friendlydatatransferbetweendesignprogramandbevelgearcalculationprogram,astandardizedinterfacewasdevelopedwhich,inadditiontotherequiredorganizationcodes.consistssubstantiallyofthecoordinatesandinterrelationshipsofthefictitiousbasicgearmachine.

Forflankgeneration,theworkgearisdescribedinSystemXl.Y1.Z1(Figure3);SystemX8,Y8,Z8carriesthecutterheadwhich.inturn,canrotatearoundthegeneratingcradleaxis(SystemX4,Y4.Z4).Thedisplacingability(therotationalabilityofthecoordinatesystems)enablefirstlythestaticsettingofthis“gearmachine”accordingtothemachinesettingsheets,andsecondly,themovementsduringcutting.Inadditiontoindexing,generating,andcuttermovements,nonlinearextramotions(helicalmotions)arealsopossibledependingonthegeneratingmotionorcutterheadrotation.

Ifonemovesthemachinekinematicsinthecomputerreconstructionawayfromthecutterheadinsmallsteps,sothatanaturalflankgriddevelopsintheworkgearaxisintersectionplane.Thecolumnsofthegridrepresenttheangularbladepositionsandthelinesofthegridrepresentthebladepoints.

Throughanappropriateselectionoftheblade-anglesettingsandthegeneratingpointsalongthecuttingedge,itispossibletodetermine,withnearlyanydesiredprecision,thecoordinatepointsoftheselectedflankgrid(whichisnormallynotidenticalwiththenaturalgrid)inasecondgeneratingphase(Figure4).Thefinalresultofthegeneratingprogramisaspatialnetworkofflankpoints,withflanknormals,whichdescribestheentiregenerate

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