Röhm Main Catalogue Clamping Technology Page 719
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Determining the required gripping force of a power chuck Power-operated clamping devices Specific cutting force kc [kN/mm2] Table 2 Specific cutting force kc at feed s and a setting angle of 45o St 42 St 50 St 60 C 45 sino 0,50 0,52 0,62 0,67 C 60 0,77 St 70 0,72 18 CrNi 6 42 CrMo 4 0,63 0,73 Steels 16MnCr5 Mn, CrNi Mn-austentic st. St 42 St 42 Cast iron materials St 42 St 42 Cast bronze Gunmetal NEferrous metals Brass Cast alumin. The chucking ratio Feed s [mm] Strength B kN/mm2 Material dz dsp 0,16 0,25 0,4 0,63 1,0 1,6 2,60 3,50 2,40 3,10 2,80 2,20 2,75 2,60 2,05 2,45 2,40 1,90 2,15 2,20 1,80 1,95 2,05 3,80 3,30 2,90 2,50 2,20 3,05 4,35 0,77 0,85-1,00 0,30-0,50 0,50-0,70 HB 2,00 HB 2,00-2,50 HB 0,80-1,20 0,30-0,422,60 4,35 3,90 3,45 3,10 2,75 2,45 3,75 3,70 5,40 2,30 2,55 1,50 2,05 2,55 1,10 1,20 1,10 3,30 3,40 4,90 2,10 2,35 1,35 1,80 2,35 1,00 1,10 1,00 2,95 3,10 4,40 1,95 2,20 1,20 1,60 2,20 0,90 1,00 0,90 2,60 2,80 4,00 1,80 2,05 1,10 1,45 2,05 0,80 0,90 0,80 2,30 2,55 3,60 1,70 1,90 1,00 1,30 1,90 0,70 0,80 0,70 2,05 2,35 3,30 1,60 1,80 0,90 1,15 1,80 0,65 0,75 0,65 can either be determined from the specified working conditions or obtaines from Table 3. Chucking ratio Table 3 20 40 60 80 20 40 60 80 100 150 200 250 300 350 400 500 600 700 800 1,0 0,5 0,33 0,25 0,2 0,13 2,0 1,0 0,67 0,5 0,4 0,27 0,2 0,16 3,0 1,5 1,0 0,75 0,6 0,4 0,3 0,24 0,2 0,17 4,0 2,0 1,3 1,0 0,8 0,53 0,4 0,32 0,27 0,23 0,2 0,16 100 150 200 250 300 350 400 500 600 700 800 2,5 1,7 1,3 1,0 0,67 0,5 0,4 033 0,29 0,25 0,2 0,17 3,8 2,5 1,9 1,5 1,0 0,75 0,6 0,5 0,43 0,38 0,3 0,25 0,21 0,19 3,3 2,5 2,0 1,3 1,0 0,8 0,67 0,57 0,5 0,4 0,33 0,29 0,25 4,2 3,1 2,5 1,7 1,3 1,0 0,83 0,72 0,62 0,5 0,42 0,36 0,31 3,8 3,0 2,0 1,5 1,2 1,0 0,86 0,75 0,6 0,5 0,43 0,37 4,4 3,5 1,3 1,8 1,4 1,2 1,0 0,87 0,7 0,58 0,5 0,44 4,0 2,7 2,0 1,6 1,3 1,1 1,0 0,8 0,67 0,57 0,5 3,3 2,5 2,0 1,7 1,4 1,3 1,0 0,83 0,71 0,62 4,0 3,0 2,4 2,0 1,7 1,5 1,2 1,0 0,86 0,75 3,5 2,8 2,3 2,0 1,8 1,4 1,2 1,0 0,87 4,0 3,2 2,7 2,3 2,0 1,6 1,3 1,1 1,0 The chucking coefficient μsp accounts for the friction existing between the gripping surface of the jaws and the workpiece in the zone of contact. It is influenced by - the pattern of the gripping surfaces of the jaws - the surface quality of the workpiece - the material. The chucking coefficient can be obtained from Table 4. Note: Forces aremore efficiently transmitted by a snug fit than by edge or saddle-Typee seats. Chucking coefficient µsp for steel parts Table 4 Smooth Gripping surface of jaws Siamond style Serrated smooth machine finish ground 0,07 0,12 0,20 rough to medium machine finish 0,10 0,20 0,35 unmachined 0,15 0,30 0,45 Surface workpiece Corrections: AI, alloy = 0,95 Brass = 0,90 Gray cast iron = 0,80 www.eshop.roehm.biz 6205 Power-operated clamping devices Depth of cut-Ø dz [mm] Feed-Ø dsp (mm)
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