>> P.310
Ⅲ-161N=0.102kgf=0.2248lbs.1mm=0.03937inchThelifeandstaticsafetyfactorinthecaseofExample1iscalculated.LoadfactorfWisassumedtobe1.5.❶CalculationofloadontheslideunitDuetotheappliedloadandthetablemass,momentloadoccursaroundeachcoordinateaxisoftheLinearWayasshownbelow.Mr=Σ(FYZ)+Σ(FZY)=FY1Z1+FZ1Y1+m1gY2+m2gY3=2000×83+1000×50+10×9.8×0+10×9.8×80≒224000Mp=Σ{FX(Z-Zd)}+Σ(FZX)=FX1(Z1-Zd)+FZ1X1+m1gX2+m2gX3=000×(83-10)+1000×60+10×9.8×0+10×9.8×75≒140000My=-Σ{FX(Y-Yd)}+Σ(FYX)=-FX1(Y1-Yd)+FY1X1=-1000×(50-150)+2000×60=220000where,Mr:Momentloadintherollingdirection,N・mmMp:Momentloadinthepitchingdirection,N・mmMy:Momentloadintheyawingdirection,N・mmTheloadsappliedoneachslideunitarecalculatedaccordingtoTable6.4onpageⅢ-11.Fr1=ΣFZ―4+Mr―2L+Mp―2ℓ=FZ1+m1g+m2g―4+Mr―2L+Mp―2ℓ=1000+10×9.8+10×9.8――4+224000―2×150+140000―2×100≒1750Fr2=ΣFZ―4+Mr―2L-Mp―2ℓ=FZ1+m1g+m2g―4+Mr―2L-Mp―2ℓ≒346Fr3=ΣFZ―4-Mr―2L+Mp―2ℓ=FZ1+m1g+m2g―4-Mr―2L+Mp―2ℓ≒252Fr4=ΣFZ―4-Mr―2L-Mp―2ℓ=FZ1+m1g+m2g―4-Mr―2L-Mp―2ℓ≒-1150Fa1=Fa3=ΣFY―4+My―2ℓ=FY1―4+My―2ℓ=2000―4+220000―2×100=1600Fa2=Fa4=ΣFY―4-My―2ℓ=FY1―4-My―2ℓ=-600❷CalculatingofratinglifeTheupward/downwardloadandlateralloadareconvertedbyformula(6)and(7)onpageⅢ-7.Fre1=kr│Fr1│=1×1750=1750Fre2=kr│Fr2│=1×346=346Fre3=kr│Fr3│=1×252=252Fre4=kr│Fr4│=1×1150=1150Fae1=ka│Fa1│=1×1600=1600Fae2=ka│Fa2│=1×600=600Fae3=ka│Fa3│=1×1600=1600Fae4=ka│Fa4│=1×600=600where,kr,ka:Conversionfactorsforloaddirection(SeeTable3onpageⅢ-7.)Thedynamicequivalentloadiscalculatedbyformula(10)onpageⅢ-7.P1=X│Fre1│+Y│Fae1│=1×1750+0.6×1600=2710P2=X│Fre2│+Y│Fae2│=0.6×346+1×600≒808P3=X│Fre3│+Y│Fae3│=0.6×252+1×1600≒1750P4=X│Fre4│+Y│Fae4│=1×1150+0.6×600=1510Thebasicratinglifeofslideunit1receivingthelargestdynamicequivalentloadiscalculated.Thebasicratinglifeisobtainedbytheformula(1)givenonthepageⅢ-6consideringtheloadfactorfw(seeTable1onpageⅢ-6).L1=50(C―fWP1)3=50×(18100―1.5×2710)3≒4410Lh1=106L1―2Sn1×60=106×4410―2×100×5×60≒73500Astheresultofcalculationabove,thebasicratinglifeisabout73,500hours.❸CalculatingofstaticsafetyfactorThestaticequivalentloadiscalculatedfromtheupward/downwardloadandlateralloadbyformula(11)onpageⅢ-8.P01=k0r│Fr1│+k0a│Fa1│=1×1750+1×1600=3350P02=k0r│Fr2│+k0a│Fa2│=1×346+1×600=946P03=k0r│Fr3│+k0a│Fa3│=1×252+1×1600=1852P04=k0r│Fr4│+k0a│Fa4│=1×1150+1×600=1750where,k0r,k0a:Conversionfactorsforloaddirection(SeeTable5onpageⅢ-8.)Thestaticsafetyfactorofslideunit1receivingthelargeststaticequivalentloadiscalculated.Thestaticsafetyfactoriscalculatedbyformula(4)onpageⅢ-6.fs1=C0―P01=21100―3350≒6.3Astheresultofcalculationabove,thestaticsafetyfactorisabout6.3.
| < 
| 
> | 
>>
