Основные расчетные формулы при токарной обработке на металлорежущих станках Расчет мощности Скорости резания Подачи Основного машинного времени Шер

Основные расчетные формулы при токарной обработке на металлорежущих станках Расчет мощности Скорости резания Подачи Основного машинного времени Шер

Основные расчетные формулы при токарной обработке на металлорежущих станках Расчет мощности Скорости резания Подачи Основного машинного времени Шероховатости обработанной поверхности загтовки FORMULAE FOR CUTTING POWER CUTTING POWER (Pc) ao f vc Kc Pc L kW 60 103 n Pc (kW) Actual Cutting Power f (mm/rev) Feed per Revolution Kc (MPa) 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 Kc3100MPa 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 CUTTING SPEED (vc) FEED (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"1 and external diameter is 50 (Answer) Substitute 7T3.14 Dm50 n700 into the formula. 7r Dm n 3.14x50x700 VC 1000 Cutting speed is 110m/min. 1000 110m/min "G f (mm/rev) Feed per Revolution (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 500min"1 and cutting length per minute is 120mm/min (Answer) Substitute n5001120 into the formula. 120 n 500 The answer is 0.24mm/rev. 0.24mm/rev CUTTING TIME (Tc) THEORETICAL FINISHED SURFACE ROUGHNESS (h) Tc (min) Cutting Time Im (mm) Workpiece Length (mm/min) Cutting Length per Min. (Problem) What is the cutting time when 100mm workpiece is machined at 1OOOmin"1 with feed 0.2mm/rev (Answer) First calculate the cutting length per min. from the feed and spindle speed. fxn 0.2x1000 200mm/min Substitute the answer above into the formula. Im 100 Tc 0.5min 200 0.5 x 6030 (sec.) The answer is 30 sec. h (im) Finished Surface Roughness f (mm/rev) Feed per Revolution RE(mm) Insert Comer Radius (Problem) What is the theoretical finished surface roughness when the insert comer radius is 0.8mm and feed is 0.2mm/rev (Answer) Substitute f0.2mm/rev RE0.8 into the formula. h Xl000 6-25Wm The theoretical finished surface roughness is 6 um. Feed Feed Depth of Cut fTT1 Theoretical Finished Surfacs Roughness Depth of Cut Theoretical Finished Surface Roughness Q011 TECHNICAL DATA