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    (each Cutter)
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  • Cutting Power for Face Milling

    Cutting Power
    計算式
    Pc (kW) : Actual Cutting Power
    ap (mm) : Depth of Cut
    ae (mm) : Cutting Width
    vf (mm/min) : Table Feed per Min.
    Kc (MPa) : Specific Cutting Force
    η: (Machine Coefficient)
    Input the values.
    ap(mm)
    ae(mm)
    vf(mm/min)
    Kc(MPa)
    η(Machine Coefficient)

    Pc(kw)


    (Problem)
    What is the cutting power required for milling tool steel at a cutting speed of 80m/min. With depth of cut 2mm, cutting width 80mm, and table feed 280mm/min by Φ250 cutter with 12 inserts. Machine coefficient 80%.
    (Answer)
    First, calculate the spindle speed in order to obtain feed per tooth.
    n=1000vc÷πDC=(1000×80)÷(3.14×250)=101.91min-1
    Feed per Tooth fz=vf÷(z×n)=280÷(12×101.9)=0.228mm/tooth
    Substitute the specific cutting force into the formula.
    Pc=(2×80×280×1800)÷(60×106×0.8)=1.68kW
    Kc
    Work Material Tensile Strength
    (MPa)
    and Hardness Specific Cutting Force Kc(MPa) 0.1
    (mm/tooth) 0.2
    (mm/tooth) 0.3
    (mm/tooth) 0.4
    (mm/tooth) 0.6
    (mm/tooth) Mild Steel 520 2200 1950 1820 1700 1580 Medium Steel 620 1980 1800 1730 1600 1570 Hard Steel 720 2520 2200 2040 1850 1740 Tool Steel 670 1980 1800 1730 1700 1600 Tool Steel 770 2030 1800 1750 1700 1580 Chrome Manganese Steel 770 2300 2000 1880 1750 1660 Chrome Manganese Steel 630 2750 2300 2060 1800 1780 Chrome Molybdenum Steel 730 2540 2250 2140 2000 1800 Chrome Molybdenum Steel 600 2180 2000 1860 1800 1670 Nickel Chrome Molybdenum Steel 940 2000 1800 1680 1600 1500 Nickel Chrome Molybdenum Steel 352HB 2100 1900 1760 1700 1530 Austenitic Stainless Steel 155HB 2030 1970 1900 1770 1710 Cast Iron 520 2800 2500 2320 2200 2040 Hard Cast Iron 46HRC 3000 2700 2500 2400 2200 Meehanite Cast Iron 360 2180 2000 1750 1600 1470 Grey Cast Iron 200HB 1750 1400 1240 1050 970 Brass 500 1150 950 800 700 630 Light Alloy (Al-Mg) 160 580 480 400 350 320 Light Alloy (Al-Si) 200 700 600 490 450 390 Light Alloy (Al-Zn-Mg-Cu) 570 880 840 840 810 720
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