558 Каталог SUMITOMO 2018 Инструмент металлорежущий Пластины Резцы Фрезы Сверла Стр.N2

Каталог SUMITOMO 2018 Инструмент металлорежущий Стр. N2 0558 Lab2u

Technical Guidance Technical Guidance Basics of Turning I Calculating Power Requirement Cutting Force I Cutting Speed and Cutting Force doc f vc Kc Pc : Net power requirement (KW) vc : Cutting speed (m/min) f : Feed rate (mm/rev) Подача (мм/об) ap : Depth of cut (mm) n : Machine efficiency (0,70 0,85) Kc : Specific cutting force (N/mm2) H : Required horsepower (HP) 60 X103 X n H = - -0,75 Rough value of specific cutting force (Kc) General steel : 2.500 3.000 N/mm2 Cast iron : 1.500 N/mm2 Aluminum : 800 N/mm2 F1 F2 F3 Principal force Feed force Back force Calculating cutting force P : Cutting force (N) P 11 q Kc : Specific cutting force (N/mm2) do 1 q : Chip area (mm2) 1000 doc: Depth of cut (mm) f : Feed rate (mm/rev) Подача (мм/об) Rake Angle and Cutting Force Calculating Cutting Speed j Calculating rotational speed from cutting speed 1000 . vc n : Spindle speed (min-1) vc : Cutting speed (m/min) n . D D : Diameter of workpiece (mm) n s 3,14 (Eg.) vc=150m/min, D=100mm 1000 x 150 n, . „ -= 478 (min-1) 3,14 x 100 k Calculating cutting speed from rotational speed n . D . n vc 1.000 Refer to the above table n vc f doc Dm Spindle speed (min-1) Cutting speed (m/min) Feed rate (mm/rev) Подача (мм/об) Depth of cut (mm) Diameter of workpiece (mm) I Feed Rate and Specific Cutting Force (For carbon steel) O) 4.000 v Traverse rupture strength 800 N/mm2 0- - 600 N/mm2 400 N/mm2 0 0,1 0,2 0,04 0,4 1,0 Feed rate (mm/rev) Подача (мм/об) When feed rate decreases, specific cutting force increases. Roughness Nose Radius and Cutting Force Theoretical Surface Finish f2 Rz = 8x r Rz f r : Surface finish (mm) Feed rate (mm/rev) Подача (мм/об) Nose radius (mm) Rz \i A Actual surface roughness Steel : Theoretical surface finish x 1,5 3 Cast iron : Theoretical surface finish x 3 5 Ways to Improve Surface Finish j Use an insert with a larger nose radius. Optimize the cutting speed and feed rate so that built-up edge does not occur. l Select an appropriate insert grade. Use wiper insert. 4000 3500 1500 1000 500 Principal force Feed force o o Back force 0,4 0,8 1,2 1,6 Nose radius (mm) Large nose radius increases back force. Work : 42CrMo4 (Hs38) Inserts : TNGA220400 Holder : PTGNR2525-43 Condition : vc =100m/min d oc =4mm f =0,45mm/rev N2