Техническая информация Sumitomo - страница 15

Basics of Drilling

• Reference of Power Requirement and Thrust

8 12,000 f=0.3 f=0.3 10,000 f: Feed rate (mm/rev) 6 8,000 f=0.2 f=0.2 4 6,000 f=0.1 4,000 f=0.1 2 2,000 Work material: S48C (220HB) 0 0

10 20 30 40 10 20 30 40

Diameter øDC (mm) Diameter øDC (mm)

• Cutting Condition Selection
• Control Cutting Force for

The following table shows the relation between edge treatment width and cutting force. If a problem Low Rigid Machine caused by cutting force occurs, reduce either the feed rate or the edge treatment width. Edge Treatment Width Drill : ø10mm Cutting Conditions Work : S50C 230HB 0.15mm 0.05mm

v (m/min) f(mm/rev) Torque (N·m) Thrust (N) Torque (N·m) Thrust (N)

c

• High Speed Machining Recommendation

If there is surplus capacity with enough machine power and sufficient rigidity, adopting higher efficiency conditions would improve the tool life; however, sufficient amount of coolant must be supplied. Wear Example

v =60m/min v =120m/min c c Work : S50C (230HB) Cond.: f = 0.3mm/rev H = 50mm Life : 600holes (Cutting length: 30m)

• Explanation of Margins (Difference between single and double margins)
• Single Margin (2 guides: circled parts)
• Double Margin (4 guides: circled parts)

N

• Shape used on most drills
• 4-point guiding reduces hole bending and undulation for

improved stability and accuracy during deep hole drilling.