>> P.299
LoadRatingandLifeLifeoflinearmotionrollingguidesBasicdynamicloadratingCComplyingwithISO14728-1asicdynamicloadratingreferstoloadwithcertaindirectionandsizethatislogicallyendurableforratinglifeof50×103mwhenagroupofthesamelinearmotionrollingguidesisoperatedindividuallyunderthesameconditions.BBasicstaticloadratingC0ComplyingwithISO14728-2Basicstaticloadratingreferstostaticloadgeneratingacertaincontactstressatthecenterofcontactpartoftherollingelementsandaracewayundermaximumload,whichistheloadattheallowablelimitfornormalrollingmotion.Generally,itisusedconsideringstaticsafetyfactor.StaticmomentratingT0,TX,TYrefersratingtostaticmomentloadStaticmomentgeneratingacertaincontactstressatthecenterofcontactpartsofrollingelementsandaracewayunderthemaximumloadwhenthemomentloadshowninFig.2isloaded,whichisthemomentloadattheallowablelimitfornormalrollingmotion.Generally,itisusedconsideringstaticsafetyfactor.leadstoleprousdamageEveninnormaloperationalstatus,alinearmotionrollingguidewillreachtheendofitslifeafteracertainperiodofoperations.Asrepeatedloadisconstantlyappliedontoaracewayandrollingelementsofthelinearmotionrollingguide,this(scale-likewearfragments)calledfatigueflakingduetorollingcontactfatigueofmaterials,itwillbeunusableattheend.Totaltravelingdistancebeforeoccurrenceofthisfatigueflakingonaracewayorrollingelementsiscalledthelifeoflinearmotionrollingguide.Asthelifeoflinearmotionrollingguidemayvarydependingonmaterialfatiguephenomenon,ratinglifebasedonstatisticcalculationisused.RatinglifeRatinglifeoflinearmotionrollingguidereferstothetotaltravelingdistance90%ofagroupofthesamelinearmotionrollingguidecanoperatewithoutlinearmotionrollingguidematerialdamagesduetorollingcontactfatiguewhentheyareoperatedindividuallyunderthesameconditions.C,C0iD1.giFrectionofloadratingT0TXTYiD2.giFrectionofstaticmomentratingⅢ-5
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