569 Каталог SUMITOMO 2018 Инструмент металлорежущий Пластины Резцы Фрезы Сверла Стр.N13

Каталог SUMITOMO 2018 Инструмент металлорежущий Стр. N13 0569 Lab2u

Technical Guidance Basics of Drilling Parts of a Drill Point Angle and Force Point angle (small) Point angle (large) When point angle is large, thrust becomes large but torque becomes small. Point Angle and Burr 0,8 £ 0,6 ig 1 0,4 5 0,2-qL X x 118° 140° '150° 0,05 0,10 0,15 0,20 0,25 Feed rate (mm/rev) Подача (мм/об) Work : SS41 Cutting speed : 50m/min When point angle is large, burr height becomes low. Min. Requirement Relief Angle Large relief angle is needed at the center of the drill. Web Thickness and Thrust Effects of thinning Web thinning decreases the thrust concentrated at chisel edge, makes the drill edge sharp and improves chip control. Tool life is also longer. Decrease Chisel Width by Thinning Width of Edge Threatment and Cutting Force 8000 )(N 6000 st ru 4000 1- 2000 0 0,2 0,3 0,4 Feed rate (mm/rev) Подача (мм/об) 0,2 0,3 0,4 Feed rate (mm/rev) Подача (мм/об) Drill: KDS 215 MAK Work material: C50 (230HB) Cutting conditions: vc = 50 m/min, Water soluble 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 : For hard-to-cut material or deep hole drilling. N13 Technical Guidance