>> P.225
Ⅲ-5CalculatingformulaoflifeRatinglifeandbasicdynamicloadratingofalinearmotionrollingguidearecorrelatedasindicatedinTable2.1andTable2.2.TemperaturefactorAstheallowablecontactstressisdecreasedatoperatingtemperatureabove150°C,thebasicdynamicloadratingshouldbecorrectedbythefollowingequation:Ct=ftC(1)where,Ct:asicdynamicloadratingtakingintoaccounttemperatureincrease,Nft:Temperaturefactor(seeFig.2)C:Basicdynamicloadrating,NHardnessfactorHardnessofaracewaymustbe58to64HRC.Whenitislowerthan58HRC,correctbasicdynamicloadratingbythefollowingequation:CH=fHC(2)where,CH:asicdynamicloadratingtakingintoaccountthehardness,NfH:Hardnessfactor(seeFig.3)C:Basicdynamicloadrating,NTable2.1CalculatingformulaoflifeforeachseriesSeriesCalculatingformulaofratinglifeCodedescriptionTotaltravelingdistance103mLifelengthhCrossedRollerWayRollerWay&FlatRollerCageL=100(C―P)3―10Lh=106L2Sn1×60L:Ratinglife,103mC:Basicdynamicloadrating,NT:Dynamictorquerating,N・mP:ynamicequivalentload(orappliedload),NM:AppliedtorqueN・mLh:RatinglifeinhourshS:Strokelengthmmn1:umberofstrokesperminutemin-1LinearSlideUnitLinearBushingL=50(C―P)3LinearBallSplineL=50(C―P)3L=50(T―M)3LoadRatingandLifeTable2.2CalculatingformulaoflifeforStrokeRotaryBushingSeriesCalculatingformulaofratinglifeCodedescriptionTotalnumberofrotation106rotationsLifelengthhRotationalmotionL=(C―P)3Lh=(DPWn)2+(10Sn1)2/DPW60106LL:Ratinglife,106rotationsC:Basicdynamicloadrating,NP:AppliedloadNLh:Ratinglifeinhourshn:Rotationalspeedmin-1n1:umberofstrokesperminutemin-1S:StrokelengthmmDPW:Pitchcirclediameterofballsmm(DPW≒1.15FW)FW:InscribedcirclediametermmRotationalandrotarycompoundmotionRotaryandlinearmotionLh=106L600Sn1/(πDPW)ft150°C1.00.950.90.850.80.75200250TemperatureFig.2Temperaturefactor60HRC5040302010.80.60.40.20.1fHRacewayhardnessFig.3Hardnessfactor
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