1270 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L10

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L10 1270 Lab2u

Turning Relating angles between tool and workpiece Shank width Cutting edge inclination Terminology Function Effect Rake angle Side rake angle Rake angle Cutting force, Cutting heat, The effects of chip control on tool life (+): Excellent machine-ability(reducing cutting force, weakening cutting edge strength) (+): When machining excellent machine-ability or thin workpiece (-): When strong cutting edge is needed at interrupted condition or mill scale Relief angle Relief angle Side relief angle Only cutting edge contact with cutting face (-): Cutting edge is strong but has short tool life to make bad influence on flank wear Cutting edge angle Cutting edge angle Affects chip control and cutting force direction (+): Improved chip control because chip thickness is big Side cutting edge angle Affects chip control and cutting force direction (+): Strong cutting edge due to distributed cutting force but chip control is bad by thin chip thickness (-): Improved chip performance End cutting edge angle Prevent friction between cutting edge and cutting face (-): Cutting edge is strong but has short tool life to make bad influence on flank wear O Calculation formulas for machining Cutting speed Feed jm tei nxDxn vc = (m/min) 1000 fn = (mm/rev) vc: Cutting speed (m/min) D: Diameter (mm) n: Revolution per minute (min-1) n: Circular constant (3.14) fn: Feed per revolution (mm/rev) vf: Table feed (mm/min) n: Revolution per minute (min-1) Surface finish Rmax Rmax: Profile depth(Maximum height roughness) (p) fn: feed (mm/rev) r : nose radius Theoretical surface roughness Rmax = 10OO(wrr) Practical surface roughness Steel: Rmax x (1.5 3) Cast iron: Rmax x (3 5) 10 Power requirement Q xkc 60x102xr Php = 0.75 Q = vc x fn x ap 1000 Pkw: Power requirement kW Php: Power requirement (horse power) HP vc: Cutting speed m/min ap: Depth of cut mm fn: Feed per revolution mm/rev kc: Specific cutting resistance kg/mm2 p: Machine efficiency rate (0.7-0.8) Technical Information Rough Kc Mild steel 190 Medium carbon steel 210 High carbon steel 240 Low alloy steel 190 High alloy steel 245 Cast iron 93 Malleable cast iron 120 Bronze, Brass 70 Material removal rate Q (cm3/min) = vc x ap x fn Q: Material removal rate cif/min ap: Depth of cut mm vc: Cutting speed m/min fn: Feed per revolution mm/rev KW