CBN / Coated CBN Grade Guidance
Hardened Steel
HARDENED STEEL MACHINING
● Advantages of CBN - SUMIBORON for hardened steel cutting Below is an analysis of the use of CBN compared to grinding. In terms of cost, not only is the investment involved for introducing new machinery reduced, it is possible to shorten the processing cycle time by finishing complicated shapes in one run. In terms of quality, machining with a single chuck is possible, improving machining accuracy and squareness. Furthermore, dry machining is possible, with various advantages such as better global environmental conservation and resource recycling. The workpieces shown in the table to the lower right have shapes more likely to benefit from being cut, especially compared to grinding.
Machining Versatility with CBN
Advantages
Remarks
L
Facility investment is low Complex finishing in a single set-up
· Cheaper machines · Reduced processes · Improved machining efficiency with less machining required
Cost
Taper Machining
Internal (Prole) Boring
Grooving / Proling
Improved precision
FF
FF
Quality
FF
Environmentally- friendly
Sludge management → Chip control
Environment
(Recyclable)
Recommended Grade
Grade
Binder CBN Content (%) Grain Size (μm) Hardness HV (GPa)
TRS (GPa)
Main Coating Components Coating Thickness (μm)
Features
TiAlN Super Multi- Layered Coating TiAlSiN Super Multi- layered Coating TiAlBN Super Multi- layered Coating TiCN Multi- layered Coating TiAlN Multi- layered Coating
Grade with excellent wear resistant coating and a CBN substrate ideal for high-speed finishing applications. Utilizing a coating with exceptional notch wear resistance and a tough CBN substrate to achieve stable and excellent surface finish. Combination of a tough CBN substrate and a coating that has a balance of wear resistance and toughness, to achieve even more stable machining.
BNC2105
TiCN 45 to 50
3
30 to 32
1.1 to 1.2
3
BNC2115
TiN 60 to 65
3
31 to 33
1.3 to 1.4
3
BNC2125
TiN 65 to 70
4
33 to 35
1.5 to 1.6
3
Improved wear resistance from coating and substrate, achieves excellent and consistent surface roughness.
BNC2010
TiCN 50 to 55
2
30 to 32
1.1 to 1.2
2
Utilising a tough substrate along with a highly wear-resistant and adhesive coating layer, to achieve long tool life in general-purpose to high-efficiency machining. Suitable for finishing work materials combining continuous and interrupted cutting. Suitable for high-speed finishing thanks to highly wear-resistant coating.
BNC2020
TiN 70 to 75
5
34 to 36
1.4 to 1.5
2
BNC300
TiN 60 to 65
1
33 to 35
1.5 to 1.6
TiAIN
1
BNC100
TiN 40 to 45
1
29 to 32
1.0 to 1.1 TiAIN/TiCN 3
BNC160
TiN 60 to 65
3
31 to 33
1.2 to 1.3 TiAIN/TiCN 3
Achieves stable, high-precision finishing of hardened steel.
A tough CBN substrate and a coating with high wear resistance provide a long tool life. Grade with 100% solid CBN structure using PVD coating with excellent wear resistance to enable roughing operations. Achieves ultimate wear and fracture resistance. Suitable for high- speed cutting. General-purpose grade for hardened steel machining with a high degree of fracture and wear resistance. Achieves excellent crater wear resistance. Suitable for high-efficiency cutting under high-temperature conditions. Achieves ultimate cutting edge strength. Suitable for heavy interrupted cutting. Excellent wear resistance. Suited for high-speed continuous machining.
BNC200
TiN 65 to 70
4
33 to 35
1.4 to 1.5
TiAIN
3
BNC8115
Al Alloy 85 to 90
8
39 to 42
0.95 to 1.15
TiAlN
2
BN1000
TiCN 40 to 45
1
27 to 31
0.9 to 1.0
-
-
BN2000
TiN 50 to 55
2
31 to 34
1.1 to 1.2
-
-
BNX20
TiN 55 to 60
3
31 to 33
1.0 to 1.1
-
-
BN350
TiN 60 to 65
1
33 to 35
1.5 to 1.6
-
-
BNX10
TiCN 40 to 45
3
27 to 31
0.9 to 1.0
-
-
Transverse rupture strength measured with test piece equivalent to insert CBN layer.
Recommended Range D Part Material Hardness and Recommended Range for SUMIBORON
Coated carbide Cermet
SUMIBORON
Ceramics
40
45
50
55
60
65
L4
Part Material Hardness (HRC)
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