Общий каталог Sumitomo 2018 - 2019 - страница 568

Предыдущая страница Следующая страница

Навигация

Burr height (mm) Flute width Drill diamerer Web thickness Thrust anRglaeke Thrust Thrust (N)Torque (N.m) Tang thickness Chisel edge angle Guidance Technical Technical Guidance Basics of Drilling Parts of a Drill Hight of point Leading edge Margin width Back taper Margin Lead Body clearance Flank Neck TangTaper shank Flute Land width Cutting edge Heel Helix angle Cuttingedge Outer corner Pointangle Body clearanceRake faceFlute length Necklength Shank length Chisel edge Overall length Chisel edge corner Straight shank Tang thickness Depth of Body clearance Tang length Chisel edge length Diameter of Relief angle Body clearance B A Web thinning Web Cutter sweep A : B or A/B = Flute width ratio Point Angle and Force Min. Requirement Relief Angle Width of Edge Threatment and Cutting Force 8000 6000 4000 2000 Point angle (small) Point angle (large) 0 0,2 0,3 0,4 When point angle is large, thrust becomeslarge but torque becomes small. * Large relief angle is needed at the center of the drill. Feed rate (mm/rev) Web Thickness and Thrust 60 Point Angle and Burr Effects of thinning 40 20 0 0,2 0,3 0,4 Feed rate (mm/rev) Drill: KDS 215 MAK Work material: C50 (230HB) Thickness Cutting conditions: Feed rate (mm/rev) vc = 50 m/min, Water soluble Work : SS41 Web thinning decreases the thrust concentrated Cutting speed : 50m/min at chisel edge, makes the drill edge sharp and When point angle is large, burr height becomes improves chip control. Tool life is also longer. low. Decrease Chisel Width by Thinning Typical types of thinning S type N type X type S type : Standard type used generaly. N type : Suitable for thin web drills. X type : F or hard-to-cut material or deep holedrilling. N13