>> P.225
LoadRatingandLifeCalculatingformulaoflifeRatinglifeandbasicdynamicloadratingofalinearmotionrollingguidearecorrelatedasindicatedinTable2.1andTable2.2.Table2.1CalculatingformulaoflifeforeachseriesSeriesCrossedRollerWayRollerWay&FlatRollerCageLinearSlideUnitLinearBushingLinearBallSplineCalculatingformulaofratinglifeTotaltravelingdistance103mLifelengthhCodedescriptionL=100(C―P)310―L=50(C―P)3L=50(C―P)3M)3L=50(T―Lh=106L2Sn1×60:Ratinglife,103mLC:Basicdynamicloadrating,NTP:Dynamictorquerating,N・m:Dynamicequivalentload(orappliedload),NM:AppliedtorqueN・mLh:RatinglifeinhourshSn1:Numberofstrokesperminute:Strokelengthmmmin-1Table2.2CalculatingformulaoflifeforStrokeRotaryBushingCalculatingformulaofratinglifeTotalnumberofrotation106rotationsLifelengthhSeriesRotationalmotionRotationalandrotarycompoundmotionL=(C―P)3=Lh106L60(DPWn)2+(10Sn1)2/DPWRotaryandlinearmotionLh=106L600Sn1/(πDPW)CodedescriptionLCPLhnn1:Ratinglife,106rotations:Basicdynamicloadrating,N:AppliedloadN:Ratinglifeinhoursh:Rotationalspeedmin-1:Numberofstrokesperminutemin-1:StrokelengthmmSDPW:PitchcirclediameterofballsmmFW(DPW≒1.15FW):InscribedcirclediametermmTemperaturefactorHardnessfactorAstheallowablecontactstressisdecreasedatoperatingtemperatureabove150°C,thebasicdynamicloadratingshouldbecorrectedbythefollowingequation:Hardnessofaracewaymustbe58to64HRC.Whenitislowerthan58HRC,correctbasicdynamicloadratingbythefollowingequation:Ct=ftC(1)CH=fHC(2)where,Ct:Basicdynamicloadratingtakingintoaccounttemperatureincrease,Nft:Temperaturefactor(seeFig.2)C:Basicdynamicloadrating,Nwhere,CH:Basicdynamicloadratingtakingintoaccountthehardness,NfH:Hardnessfactor(seeFig.3)C:Basicdynamicloadrating,N2000.90.952500.850.80.75HRCfH605040302010.80.60.40.20.1Racewayhardness2.giFTemperaturefactor3.giFHardnessfactorTemperature°Cft1501.0Ⅲ-5
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