1291 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L31

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L31 1291 Lab2u

Drills L O Major cutting formulas Cutting speed Feed Helix angle n D n , , . , vc = 1000 (m/min) vc: Cutting speed (m/min) D: Drill diameter (mm) n: Revolution per minute (min-1) n: Circular constant (3.14) fn = -n (mm/rev) fn: Feed per revolution (mm/rev) vf: Feed per minute (mm/min) n: Revolution per minute (min-1) 5 = tan-1 D) 5: Helix angle D: Drill diameter (mm) L: Lead (mm) n: Circular constant (3.14) Machining time tc = Id n-fn (min) tc: Machining time (min) n: Revolution per minute (min-1) Id: Drilling time (mm) fn: Feed (mm/rev) Cutting torque and thrust (calculation formulas) Md = KD2x (0.0631 + 1.686xfn) (kg-cm) ‘ Md: Cutting torque (kg-cm) fn: Feed per revolution (mm/rev) T: Cutting thrust (kg) K: Material coefficient T = 57.95KDfn°=(kg) D: Drill diameter (mm) Workpiece material (SAE/AISI) Tensile strength (kgf) Hardness (HB) Material coefficient K Cast iron Cast iron (Gray) 21 177 1.00 Cast i ron 28 198 1.39 Cast iron (Ductile) 35 224 1.88 General steel 1020(carbon steel C 0.2%) 55 160 2.22 1112(C 0.12, S 0.2%) 62 183 1.42 1335(Mn 1.75%) 63 197 1.45 Nickel Chrome steel 3115 (Ni 1.25, Cr 0.6, Mn 0.5) 53 163 1.56 3120 (Ni 1.25, Cr 0.6, Mn 0.7) 69 174 2.02 3140 88 241 2.32 Chrome molybdenum steel 4115 (Cr 0.5, Mo 0.11, Mn 0.8) 63 167 1.62 4130 (Cr 0.95, Mo 0.2, Mn 0.5) 77 229 2.10 4140 (Cr 0.95, Mo 0.2, Mn 0.85) 94 269 2.41 Nickel molybdenum steel 4615 (Ni 1.8, Mo 0.25, Mn 0.5) 75 212 2.12 4820 (Ni 3.5, Mo 0.25, Mn 0.6) 140 390 3.44 Chrome steel 5150 (Cr 0.8, Mn 0.8) 95 277 2.46 Chrome vanadium steel 6115 (Cr 0.6, Mn 0.6, V 0.12) 58 174 2.08 6120 (Cr 0.8, Mn 0.8, V 0.1) 80 255 2.22 Cutting torque and thrust (empirical formula) Md = K1d2- fnm Md: Cutting torque (kg-cm) fn: Feed (mm/rev) d: Drill diameter (mm) T = K2d fnn T: Thrust fa) K1, K2, m, n: Experimental Data Characteristic value Workpiece K1 m K2 n Soft steel 5.9 1.00 125.0 0.88 Rolled steel 3.5 1.00 55.0 0.88 7-3 brass 2.5 0.94 44.4 0.87 Aluminum 1.5 0.90 33.3 0.78 Zinc 1.4 0.88 27.0 0.74 Gun metal 2.0 0.94 21.6 0.75 Galvanized iron 0.3 0.57 6.4 0.55 Technical Information 31