CBN / Coated CBN CBN Grade Guidance
Cast Iron
CAST IRON MACHINING
● Advantages of machining cast iron with CBN - SUMIBORON Compared with conventional tools, a longer tool life for high speed machining is acheived. In addition, machining efficiency is improved along with consistently better wear resistance, a sharper edge, excellent surface roughness and dimensional tolerance. CBN - SUMIBORON is ideal for finishing of gray cast iron and ductile cast iron and heat-treated high-grade cast iron such as ADI.
High-speed Machining
High-speed Machining
High-precision Machining
● Gray Cast Iron
● Ductile Cast Iron
L
1,650
BNC8115/BNS8125 BN7125 BN7000 BN500
3,300
Ceramics Coated carbide Cermet
BNX10
BNS8125 BN7125 BN7000 BNC500
BNC500
1,650
650
↓
BN7125 BN7000
Ceramics Coated carbide Cermet
650
Ceramics Coated carbide Cermet
0.4 0.8 1.6 3.2
1
10
20
10 Tool Life Ratio
1
Tool Life Ratio
Good ←
Surface Roughness Standard Ra (μm)
Recommended Grade
Grade
Binder CBN Content (%) Grain Size (μm) Hardness HV (GPa) Transverse Rupture Strength (GPa) Main Coating Components Coating Thickness (μm)
Features
100% solid CBN structure and excellent thermal shock resistance. General-purpose grade with excellent wear, fracture, and thermal resistance, suitable for machining of cast iron and exotic alloys. Exhibits wear and fracture resistance in cutting of cast iron and exotic alloys. Grade optimised for cast iron cutting. Provides superior wear and fracture resistance. Grade with 100% solid CBN structure, using PVD coating with excellent wear resistance to enable roughing operations. Suitable for machining of hard-to-cut cast iron, thanks to the highly wear-resistant substrate and coating.
BNS8125
Al Alloy 85 to 90
39 to 42 0.95 to 1.15
8
-
-
Co Compound Co Compound
BN7125
90 to 95
41 to 44
1.9 to 2.0
2
-
-
BN7000
90 to 95
41 to 44
1.8 to 1.9
2
-
-
BN500
TiC 65 to 70
32 to 34
1.0 to 1.1
6
-
-
BNC8115 Al Alloy 85 to 90
39 to 42 0.95 to 1.15 TiAlN
8
2
BNC500 (For Ductile Cast Iron)
TiC 60 to 65
32 to 34
1.1 to 1.2
4
TiAIN
3
Transverse rupture strength measured with test piece equivalent to insert CBN layer. Refer to pages L9 and L10 for machining of sintered components, rolls, hard facing alloys and heat-resistant alloys.
Application Range
D Gray Cast Iron
D Ductile Cast Iron
Finishing region
Roughing region
1640
8200
BN7125 BN7000
BNC500
6560
1320
BNC8115 BNS8125
4920
990
BNC8115
3280
660
BN7125 BN7000
1640
BN500
0
0
.02
.04
.06
.08
.10
.12
.16
.04
.08 .12 Depth of Cut ap (Inch)
Depth of Cut ap (Inch)
D Special Cast Iron
Cutting Speed vc (SFM)
Work Material Structure
Hardness (HB)
Work Material
Examples
330
660
990 1150
1320
1640
Ni-resistant Cast Iron High-Cr Cast Iron
BNC500
150 to 200
Austenite
Piston ring
BNS8125
250 to 350
Austenite
Pump component
Engine blocks Cylinder heads Brake discs
FCV (CGI)
BNC500
400 to 580
Pearlite
L7
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