Техническая информация Sumitomo - страница 16

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Technical Guidance Basics of Drilling Drilling Edition ■ Run-out Accuracy For the run-out accuracy of web-thinned drills, not (Units: mm) only the difference in lip height (B) but also the run- MDS140MK Hole Expansion (mm) 0.25 S50C out after thinning (A) is important. vc＝50m/min 0.20 f＝0.3mm/rev 0.15 0.10 0.05 Center run-out 0 (A): The run-out accuracy of thinning point (A) (mm) 0.005 0.02 0.05 0.1 (B): The difference of the lip height Peripheral run-out 0.005 0.02 0.1 0.05 0.02 0.1 (B) (mm) ■ Peripheral Run-out Accuracy ● When the tool rotates Peripheral when Tool Rotates Run-out Hole Expansion Cutting Force* The peripheral run-out accuracy (mm) 0 0.05(mm) 0 10 (kg) of the drill mounted on the spindle 0.005 should be controlled within 0.03mm. If the run-out exceeds 0.09 the limit, the drilled hole will also become large causing an increase * Horizontal cutting force. in the horizontal cutting force, Drill: MDS120MK Work material: S50C (230HB) which may result in drill breakage. Cutting Conditions： c=50m/min, =0.3mm/rev, =38mm Run-out: within 0.03mm Water soluble coolant ● When the work material rotates 0.03mm Run-out: within 0.03mm Not only the peripheral run-out at the drill edge (A) but also the concentricity at (B) should be controlled within 0.03mm. Chuck ■ Influence of Work ● Work material with slanted or uneven surface (Entrance) (Exit) Material Surface If the surface of the hole entrance or exit is slanted or uneven, decrease the feed rate to 1/3 to 1/2 of the recommended cutting condition. ■ How to Use a Long Drill ● Problem Hole bend When using a long drill (XHGS type), DAK type drill, SMDH-D type drill, or SMDH-12.5D type drill at high Position shift rotation speeds, the run-out of the drill tip may cause a deviation of the entry point as shown on the right, bending the drill hole and resulting in drill breakage. ● Remedies Method 1 N Step 1 Step 2 Step 3 Technical Guidance / References 1xDC pilot hole 2 to 3mm (same dia.) n=100 to 300min–1 Drilling under Short drill recommended condition Method 2 * Low rotational speed minimises centrifugal forces and prevents drill bending. Step 1 2 to 3mm Step 2 Drilling under recommended condition (n=100 to 300min–1) f=0.15 to 0.2mm/rev N24