Röhm - Power chucks and cylinders - steady rests Page 220
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Determining the required gripping force of a power chuck Power-operated clamping devices Solution 1) Main cutting force (Formula 2) s·t = from Table 1 kc = from Table 2 2) Required gripping force (Formula 1) Fs Fspz = s · t · kc = 0,5 · 5 · 2,50 = 6,25 kN = = Fs · Sz µsp . dz dsp 6,25 kN · 2,0 · 0,33 0,20 Safety factor Chucking coeff. Chucking ratio Sz µsp dz dsp ≈ 21,00 kN = from Table 5 = from Table 4 = from Table 3 3) Obtain the loss of the gripping force from the gripping force speed diagram for KFD 200. At a speed of 3000 rpm: Fc = 18 kN. See diagram below. 4) Initial gripping force Fspo = Ssp · (Fspz + Fc) (Formula 3) = 1,5 · (21 kN + 18 kN) = 58,50 kN Ssp determined in accordance with VDI Recommendation 3106 Fc obtained from diagram below 5) Obtain operating power from ”gripping force/operating power” diagram for KFD 200. For a gripping force of 58,50 kN the operating power is ~ 29,00 kN (next page) Gripping force/speed diagram for KFD 3-jaw chucks lower curve: max. centrifugal force of top jaw upper curve: min. centrifugal force of top jaw KFD 315 KFD 315 160 Shallow design 140 Total gripping force kN Power-operated clamping devices 180 KFD 250 120 100 80 60 } KFD 200 Loss of gripping force = Fc (~ 18 kN) KFD 160 40 KFD 130 20 1000 2000 3000 Speed rpm 6218 www.eshop.roehm.biz 4000 5000
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