1767 Каталог MITSUBISHI 2020 Режущий инструмент Фрезы Резцы Сверла Пластины Стр.R015

Каталог MITSUBISHI 2020 Режущий инструмент для станков Стр. R015 1767 Lab2u

FORMULAE FOR CUTTING POWER CUTTING POWER (Pc) Pc = ap-f’VC’Kc 60x103xn (kW) Pc (kW) f (mm/rev) Kc (MPa) Actual Cutting Power Feed per Revolution Specific Cutting Force ap (mm) : Depth of Cut vc (m/min): Cutting Speed n: (Machine Coefficient) (Problem) What is the cutting power required for machining mild steel at cutting speed 120m/min with depth of cut 3mm and feed 0.2mm/rev (Machine coefficient 80%) Kc (Answer) Substitute the specific cutting force Kc=3100MPa into the formula. Pc 3x0.2x120x3100 60x103x0.8 = 4.65 (kW) Work Material Tensile Strength(MPa) and Hardness Specific Cutting Force Kc (MPa) 0.1 (mm/rev) 0.2 (mm/rev) 0.3 (mm/rev) 0.4 (mm/rev) 0.6 (mm/rev) Mild Steel 520 3610 3100 2720 2500 2280 Medium Steel 620 3080 2700 2570 2450 2300 Hard Steel 720 4050 3600 3250 2950 2640 Tool Steel 670 3040 2800 2630 2500 2400 Tool Steel 770 3150 2850 2620 2450 2340 Chrome Manganese Steel 770 3830 3250 2900 2650 2400 Chrome Manganese Steel 630 4510 3900 3240 2900 2630 Chrome Molybdenum Steel 730 4500 3900 3400 3150 2850 Chrome Molybdenum Steel 600 3610 3200 2880 2700 2500 Nickel Chrome Molybdenum Steel 900 3070 2650 2350 2200 1980 Nickel Chrome Molybdenum Steel 352HB 3310 2900 2580 2400 2200 Hard Cast Iron 46HRC 3190 2800 2600 2450 2270 Meehanite Cast Iron 360 2300 1930 1730 1600 1450 Grey Cast Iron 200HB 2110 1800 1600 1400 1330 ICUTTING SPEED (vc) IFEED (f) vc (m/min) : Cutting Speed Dm (mm) : Workpiece Diameter 71 (3.14) : Pi n (min'1) : Main Axis Spindle Speed Divide by 1000 to change to m from mm. (Problem) What is the cutting speed when main axis spindle speed is 700min'' and external diameter is 50 (Answer) Substitute n=3.14, Dm = 50, n = 700 into the formula. 7T'Dnvn 3.14x50x700 VC 1000 Cutting speed is 110m/min. 1000 = 110m/min "G f= -(mm/rev) f (mm/rev) : Feed per Revolution I (mm/min): Cutting Length per Min. n (min'1) : Main Axis Spindle Speed (Problem) What is the feed per revolution when main axis spindle speed is SOOmin'1 and cutting length per minute is 120mm/min (Answer) Substitute n = 500,1 = 120 into the formula. f=-L = n 120 500 The answer is 0.24mm/rev. = 0.24mm/rev ICUTTING TIME (Tc) ITHEORETICAL FINISHED SURFACE ROUGHNESS (h) Tc (min) : Cutting Time Im (mm) : Workpiece Length I (mm/min): Cutting Length per Mir. (Problem) What is the cutting time when 100mm workpiece is machined at lOOOmln'1 with feed = 0.2mm/rev (Answer) First, calculate the cutting length per min. from the feed and spindle speed. I = fxn = 0.2x1000 = 200mm/min Substitute the answer above into the formula. 100 Tc = = ic- , 200 = 0.5min 0.5 x 60=30 (sec.) The answer is 30 sec. h= f2 8RE -x1000(jzm) h (