Общий каталог Sumitomo 2018 - 2019 - страница 561

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Technical Guidance Specific cutting force (N/mm2) doc Overall height Technical Guidance Basics of Milling Parts of a Milling Cutter External diameter of cutter body External diameter of boss Hole diameter Width of key way Cutter Body Depth of key way Axial rake angle Back locating Approach face Setting ring angle Front relief True rake Screw angle angle A Inclinationangle Insert Chip pocket Relief Diameter of cutter angle Locator Clamp Section A Setting ring Wiper flatclearance Major cutting edge angle Radial rake angle Inward dish(if trail angle)Chamfered corneror wiper flat (if 0°) Power Requirement l Calculating cutting force l Relation between feed rate, work material, specific cutting force Pc = doc . woc . v f . Kc605 1065η(kW) Work- –––s––– –– –– ––– 5––– – – l– –pieceAlloyCarbonCastAluminum No. steel steel iron alloy j 1.800 800 200 – k 1.400 600 160 – Pc : Net power requirement (kW) l 1.000 400 120 – l Horsepower H : Horsepower requirement (HP) Values in the table show the following properties: H= Pc0,75 Q : Chip removal amount (cm3/min) - Tensile strength (N/mm2) for alloy steel and carbon steelwoc : Cutting width (mm)- Hardness (HB) for cast iron vf : Feed speed (mm/min) doc : Depth of cut (mm) l Chip removal amount η : Machine efficiency (0,70 ~ 0,85) Q= doc 5 woc 5 v f (cm3/min) Kc : Specific cutting forrce (N/mm2) 1.000 Eg. rough value ( ) Steel : 2.500 ~ 3.000 Cast iron : 1.500 Feed rate (mm/tooth) l Calculating cutting speed vc = π 5D 5n 1.000 vc : Cutting speed (m/min) π ≈ 3,14 vf l Calculating feed rate D : Cutter diameter (mm)n:Rotation speed (rpm) vf = ft 5 z 5 n vf : Feed speed (mm/min) ft = vfz5n ft : Feed rate (mm/tooth)z:Number of teeth ft vf N6