Каталог Sumitomo пластины с кубическим нитридом бора Sumiboron - страница 100

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Insert for High Efficiency Machining & Special HoldersSUMIBORON

■ Characteristics

  • Improved surface roughness in high-feed cutting.
  • Perfect for copying where good surface roughness is required.
  • Effect of Different Nose Radii
  • Comparison of Theoretical Surface Roughness

Nose Radius (mm)

Large Nose Radius

: Feed Rate Same surface f roughness at Good Surface Roughness approx. 2x efficiency

Work Material

Small Nose Radius

f : Feed Rate

Work Material

  • Comparison of Machined Surface Finish by Different Nose Radii

f L f Good Surface Roughness f f

Less than 1/3 of theoretical surface roughness

Feed Rate (mm/rev)

Feed RateNose radius of 0.8mm compared to 2.4mm
f=0.2mm/revTheoretical surface roughness 1/3 or lower
Required Theoretical
Surface RoughnessNose radius of 0.8mm compared to 2.4mm
Rz 8.0 μmSame surface roughness at approx. 2x efficiency
  • Actual value of surface roughness is approximately 1.5 to 3 times higher (for steel).
  • Theoretical surface roughness is calculated using the following formula: h = (f2/8r) × 103
  • Comparison of Cutting Force by Different Nose Radii

35% Increase With Wiper Insert

Wiper Insert 10 to 15% Increase With Large Nose Inserts

Wiper Wiper

Inserts with a larger nose radius also give better surface roughness during actual machining. Lower cutting force than wiper inserts allows high-feed cutting.

Work Material: SCM415H(60HRC) Work Material: SCM415H(60HRC)

Cutting Conditions: v =100m/min, a =0.1mm, Dry Cutting Conditions: v =150m/min, f=0.3mm/rev, a =0.1mm, Dry