LM Guide Model HR

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www.thk.ru thk-mail@ya.ru Тел. (495) 727-22-72*1: Dimensional table formodel HRModel HR pages 11-12Rated Loads in All DirectionsWhen installed, one set of model HR iscapable of receiving loads in all fourdirections: radial, reverse-radial andlateral directions.The basic load ratings of an installed set ofmodel HR are equal in all four directions (radial,reverse-radial and lateral directions).The basic load ratings in the dimensionaltable* 1 for model HR indicate the values in theradial direction per LM block as shown in thefigure on the right.Reverse-radial directionLateraldirectionRadial directionLateraldirectionEquivalent LoadWhen the LM block of model HRreceives loads in the reverse-radialand lateral directions simultaneously,the equivalent load is obtained fromthe equation below.wherePEPRPLPE :Equivalent load (N)⋅Radial direction⋅Reverse-radial direction⋅Lateral direction12PTPR :Radial load (N)PL :Reverse-radial load (N)PT :Lateral load (N)
www.thk.ru thk-mail@ya.ru Тел. (495) 727-22-72HR OUTLINEModel HR - Product OverviewService lifeThe service life of an LM Guide is subject to variations even under the sameoperational conditions. Therefore, it is necessary to use the rated life definedbelow as a reference value for obtaining the service life of the LM Guide.Rated lifeThe rated life means the total travel distancethat 90% of a group of units of the same LMGuide model can achieve without flaking(scale-like exfoliation on the metal surface)after individually running under the sameconditions.Service life timeOnce the rated life (L) has been obtained, theservice life time can be obtained using theequation on the right if the stroke length andthe number of reciprocations are constant.fH · fT · fC CL = ( · ) 3 50fWPCL : Rated life (km)C : Basic dynamic load rating* 1 (N)PC : Calculated load (N)fH : Hardness factor (see Fig. 1)fT : Temperature factor (see Fig. 2)fC : Contact factor (see Table 1)fW : Load factor (see Table 2)L 10 6Lh =2 RS n1 60Lh : Service lifetime (h)Rs : Stroke length (mm)n1 : No. of reciprocations per min (min -1 )*1: Basic dynamic load rating(C)It refers to a load with aconstant magnitude anddirection under which therated life (L) of a group ofidentical LM Guide unitsindependently operating is50 km.fHHardness factorTo ensure the achievement of the optimum load capacity of the LM Guide,the raceway hardness must be between 58 and 64 HRC.At hardness below this range, the basic dynamic and static load ratingsdecrease. Therefore, the rating values must be multiplied by therespective hardness factors (fH).Since the LM Guide has sufficient hardness, the fH value for the LM Guideis normally 1.0 unless otherwise specified.Fig. 1 1.0Fig. 20.90.81.00.90.70.60.50.40.30.80.70.60.50.20.1Hardness factor fH60 50 40 30 20 10Raceway hardness (HRC)fTTemperature factorSince the service temperature of Caged Ball LM Guides is normally 80Cor below, the fT value is 1.0.Temperature factor fT100 150 200Raceway temperature (°C)fCContact factorWhen multiple LM blocks are used in close contact with each other, it isdifficult to achieve uniform load distribution due to moment loads andmounting-surface accuracy. When using multiple blocks in close contactwith each other, multiply the basic load rating (C or C0) by thecorresponding contact factor indicated in Table 1.Note: When uneven load distribution is expected in a large machine, consider using a contactfactor from Table 1.Table 1 Contact Factor (fC)Number of blocks used in close contact Contact factor fC20.8130.7240.6650.616 or more0.6Normal use1fWLoad factorIn general, reciprocating machines tend to produce vibrations or impactduring operation. It is especially difficult to accurately determine allvibrations generated during high-speed operation and impacts producedeach time the machine starts and stops. Therefore, where the effects ofspeed and vibration are estimated to be significant, divide the basicdynamic load rating (C) by a load factor selected from Table 2, whichcontains empirically obtained data.Table 2 Load FactorfWVibration/impact Speed (V) fWFaintVery slowV0.25m/s1 to 1.2WeakSlow0.25V1m/s1.2 to 1.5ModerateMedium1V2m/s1.5 to 2StrongFastV2m/s2 to 3.5
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LM Guide Model HR

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