Röhm Main Catalogue Clamping Technology Page 725
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Determining the required gripping force of a power chuck Power-operated clamping devices Calculation (example): Having: 1. Workpiece and machining data. Material = Chucking dia. dsp (roughed) = Drill dia. (in solid mat.) = Feed s = Deepth of cut t = Speed n = C 45 60 mm 30 mm 0,3 mm 15 mm 200 min-1 2. Chuck data Power chuck KFD 200 Jaws with diamond style gripping surface External gripping with UB 538-04 top jaws at mid position of gripping range Chuck in new condition (no special influencing parameters) Find: 1. Required gripping force Fspz 2. Initial gripping force Fspo 3. Operating power Solution: 1. Cutting force (Formula 4) FsBo = s · t · kc = 0,3 · 15 · 2,70 = 12,10 kN s · t from Table 1 (or calculated) kc from Table 2 2. Required gripping force FR · Sz μsp . dz dsp . = 15,70 2,0 . 0,25 = 39,25 kN 0,2 Power-operated clamping devices Fspz = Obtain resultant force FR from Table 7 (after first obtaining F Chucking ratio dz dsp from Table 3 (or calculated). 3. Check if any effective centrifugal forces act on the jaws at a speed of n = 200 min-1. As this is not the case in this example, we have: 4. Initial gripping force Fspo = Ssp . Fspz Ssp from VDI recommendation 3106 = 1,5 · 39,25 kN = 59,00 kN 5. Obtain operating power from the ”gripping force/operating power” diagram for KFD 200. For a gripping force of 59,00 kN the operating power is 29 kN 6. For boring (using a boring cutter) the calculation described under ”A. Turning” applies analogously. www.eshop.roehm.biz 6211
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