571 Каталог SUMITOMO 2018 Инструмент металлорежущий Пластины Резцы Фрезы Сверла Стр.N15

Каталог SUMITOMO 2018 Инструмент металлорежущий Стр. N15 0571 Lab2u

Technical Guidance Basics of Drilling Run-out Accuracy Peripheral Run-out Accuracy when Tool Rotates Peripheral Run-out Accuracy when Workpiece Rotates I Influence of Workpiece Surface How to Use Long Drill i Problem Drill run-out when mounted on the machine spindle must be within 0,03mm. If the run-out is large, the drilled hole will also be large causing an increase in the horizontal cutting force, which may result in drill breakage if the machine or work clamping is not rigid. Peripheral run-out (mm) Hole expansion Horizontal cutting force 0 0,05 (mm) 0 10 (kg) 0,005 0,09 Run-out: within 0,03mm Drill: MDS120MK Work material: C50 (230HB) Cutting data: Vc=50 m/min, f=0,3 mm/reV, doc =38mm Water soluble When use on a lathe, run-out at point A must be within 0,03mm, this Value must be similar when taken at position B. Chuck Workpiece with slanted or uneVen surface If the surface of the hole entrance or exit is slanted or uneven, decrease the feedrate to 0,1 0,15mm/rev at these points. (Entrance) M4JJ (Exit) IP j When using a long drill (e.g. XHGS type and XHT type), DAK type or SMDH-D type drills at high rotational speeds, the run-out of the drill tip may cause a position shift at the entry point making the drill hole bent and resulting in drill breakage. Hole bend T Position shift Method 1. Step 1 =P > A % - Pilot hole \ (1D, Same dia.) Step 2 No rotation 2 3 mm Short drill Method 2. Low rotational speed minimizes centrifugal forces and preVents drill bending. Drilling at recommended condition Step 1 2 3 mm (n = 100 300 rpm) (f =0,15 0,2 mm/reV) Drilling at recommended condition N15 Technical Guidance