1281 Каталог KORLOY 2020 Инструмент и оснастка для станков по металлу Стр.L21

Каталог KORLOY 2020 Инструмент для станков по металлу Стр. L21 1281 Lab2u

Milling O Features by combination of rake angle Double positive angle Double negative angle Posi - Negative angle Nega - Positive angle C £3 '5i '5 5 A-R(+) AR -> u tn 3 General machining of steel, cast iron, stainless steel Machining soft steel that brings about built-up edge easily Machining material having tendency to poor surface roughness Under interrupted cutting condition Roughing of cast iron and steel 1 Machining difficult to cut material 1 Roughing with deep depth of cut and wide width of cut in steel and cast iron Chip flows to center of cutter body n o ra £ c c As for tough workpiece material It prevents built-up edge to improve surface roughness Low cutting load and better machinability Strong cutting edge Roughing of workpiece that has bad surface condition containing sand, mill scale Double sided inserts can be applied(Economical) Good chip control Good chip flow and machinability Suitable for machining of difficult-to-cut material Weak cutting edge strength Only single sided inserts are available (No economical) Machine and cutter need enough power and rigidity Machine and cutter need enough power and rigidity Only single sided inserts are available (No economical) Since the chips flows toward the center of cutter. Chips scratch on machined surface Bad chip flow No economical O Major cutting formulas 'utter 0D ap o Jn c r A Workpiece -vf fn -vf Cutting speed x-D-n , , . , vc = 1000 (m/min) vc: Cutting speed (m/min) D: Diameter of tool (mm) n: Revolution per minute (min-1) n: Circular constant (3.14) Feed l fz = -f (mm/t) fz: Feed per tooth (mm/t) vf: Feed per minute (mm/min) n: Revolution per minute (min-1) z: Number of tooth Chip removal amount Q = 1000 p (cm3/min) Q: Chip removal amount (cm3/min) L: Width of cut (mm) vf: Table feed (mm/min) ap: Depth of cut (mm) Power requirement p = Qxkc p Pkw 60x102xr 1 hp = 0.75 Pc: Power requirement (kW) H: Horse power requirement (hp) (mm/min) Q: Chip removal amount (cm3/min) kc: Specific cutting resistance (kgf/mm3) r : Machine efficiency rate (0.7-0.8) Machining time T = Lt (sec) T: Machining time (sec) Lt: Total length of table feed (mm) (= Lw+D+2R) Lw: The length of workpiece (mm) D: The diameter of cutter body (mm) vf: Table feed (mm/min) R: Relief length (mm) True rake angle/Cutting edge inclination angle T rue rake angle tan (T) = tan (R) x cos (AA) + tan (A) x sin (C) Cutting edge inclination angle tan (I) = tan (A) x cos (AA) - tan (R) x sin (C) Technical Information 21