Общий каталог Sumitomo 2018 - 2019 - страница 561

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 Overall height Axial rake angle Back locating Approach face Setting ring angle Front relief True rake angle angle Inclination Screw A angle Insert Chip pocket Relief Diameter of cutter angle Locator Clamp Section A Setting ring Wiper flat Major cutting edge clearance angle Inward dish Chamfered corner (if trail angle) Radial rake angle or wiper flat (if 0°) Power Requirement l Calculating cutting force l Relation between feed rate, work material, specific cutting force d oc . w oc . v f . K c Work- –––s––– –– – – –––5––– – – l– – Pc = (kW) 60 5 10 6 5 η piece Alloy Carbon Cast Aluminum No. steel steel iron alloy j 1.800 800 200 – k 1.400 600 160 – P c : Net power requirement (kW) l 1.000 400 120 – l Horsepower H : Horsepower requirement (HP) Specific cutting force (N/mm2) Values in the table show the following properties: Pc Q : Chip removal amount (cm3/min) - Tensile strength (N/mm 2) for alloy steel H= 0,75 and carbon steel woc : Cutting width (mm) - Hardness (H B) for cast iron v f : Feed speed (mm/min) d oc : Depth of cut (mm) l Chip removal amount η : Machine efficiency (0,70 ~ 0,85) d oc 5 w oc 5 v f Q= (cm3/min) K c : 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 π 5D 5n vc = 1.000 v c : Cutting speed (m/min) π ≈ 3,14 vf D : Cutter diameter (mm) l Calculating feed rate n : Rotation speed (rpm) vf = ft 5 z 5 n v f : Feed speed (mm/min) Technical Guidance f t : Feed rate (mm/tooth) vf ft = z : Number of teeth d oc z5n ft vf N6