CBN - SUMIBORON Inserts & Special Holders for High Efficiency Machining ■ Features
● Improved finished surface roughness with high-feed cutting ● Ideal for profiling when when low surface roughness is required
L
● Operation with different nose radii
● Comparison of Theoretical Surface Roughness
inch
Nose Radius
R.0313 R.0469 R.0630 R.0787 R.0945
Large Nose Radius
Same surface roughness at approx. double the ef ciency
f
Feed Rate
Good Surface Roughness
Part Material
Theoretical Surface Roughness 1/3 or Less
Small Nose Radius
f Feed Rate
.0039
IPR .0078 .0119
.0156 .0195
Feed Rate
Feed Rate
Theoretical surface roughness 1/3 or lower Nose Radius .0313” vs. .0938” Comparison
= .0079 IPR
f
Part Material
Required Theoretical Surface Roughness μm
Same surface roughness at approx. double the ef ciency Nose Radius .0313” vs. .0938” Comparison
* 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 = (f 2 / 8r) x 10 3 ].
● Machined surface roughness comparison with different nose radii
● Cutting force comparison with different nose radii
= .0039” = .0078” = .0119” = .0156”
f f f f
Wiper Insert 35% Increase
Good Surface Roughness
Wiper Insert
Large Radius Inserts Approx. 10 to 15% Increase
434 R.0625
432 R.0313
434
432
Wiper 432
436 R.0938
435 436
433
Wiper 432
R.0313 R.0469 R.0625 R.0787 R.0938
Low cutting force compared to wiper insert enables high-feed cutting
Inserts with a larger nose radius also give better surface roughness during actual machining
Part Material: Chromium Molybdenum Steel (60HRC) Cutting Conditions: v c = 330 SFM, a p = .0039” Dry
Part Material: Chromium Molybdenum Steel (60HRC) Cutting Conditions: v c = 500 SFM, f = .0117 IPR , a p = .0039” Dry
L110
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