Общий каталог Sumitomo 2018 - 2019 - страница 570

Technical Guidance Basics of Drilling Run-out Accuracy Run-out of the lip height B and thinning point A are (mm) important. MDS 140 MK 0,25 50C vc = 50m/min Hole expansion 0,20 f = 0,3mm/rev 0,15 0,10 0,05 0 A : The run-out accuracy of thinning point A 0,005 0,02 0,05 0,1 B : The difference of lip height B 0,005 0,02 0,1 0,05 0,02 0,1 Peripheral Run-out Drill run-out when mounted on Peripheral Accuracy the machine spindle must be run-out Hole expansion Horizontal cutting force when Tool Rotates within 0,03mm. If the run-out is (mm) 0 0,05 (mm) 0 10 (kg) large, the drilled hole will also be 0,005 large causing an increase in the horizontal cutting force, which may result in drill breakage if the 0,09 machine or work clamping is not rigid. Drill: MDS120MK Work material: C50 (230HB) Cutting data: vc=50 m/min, f=0,3 mm/rev, doc =38mm Water soluble Run-out: within 0,03mm Peripheral Run-out When use on a lathe, run-out at point A must be within Chuck Run-out: within 0,03mm Accuracy 0,03mm, this value must be similar when taken at when Workpiece Rotates position B. Influence of Workpiece Workpiece with slanted or uneven surface (Entrance) (Exit) 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. How to Use Long Drill When using a long drill (e.g. XHGS type and Hole bend Problem 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 Position shift breakage. Remedies Method 1. No rotation Step Step Step 1 2 3 Pilot hole 2~3 mm (1D, Same dia.) Drilling at recommended Short drill condition Method 2. Low rotational speed minimizes centrifugal forces and prevents drill bending. Technical Guidance 2~3 mm Step Step 1 2 Drilling at recommended (n = 100~300 rpm) (f =0,15~0,2 mm/rev) condition N15