SUMIBORON / Coated SUMIBORON CBN Grade Guidance
Sintered Alloy
SINTERED COMPONENT MACHINING
● Advantages of cutting sintered components with CBN - SUMIBORON CBN - SUMIBORON has much smaller edge wear than carbide or cermet, and also has better wear resistance and can form a sharp edge easily. CBN - SUMIBORON is able to prevent burrs and chipping on the edges of the workpiece, achieving good machining precision and surface roughness.
Sintered Components
Recommended Grade
● General Powdered Metal
● High-Density/Sintered Powdered Metal
L
General Powdered Metal (50-90HRB)
High-density Sintered Powdered Metal (30 to 65 HRC)
Finishing region
Finishing region
Roughing region
Roughing region
1000
1000
650
650
BN7500
BN7500
BN7000
330
330
BN7000
.0039 .0079 .0118 .0157 .0197
0 .0039 .0079 .0118 .0157 .0197 .0118 .0079 .0059 .0099 .0039 .0019
0
Depth of Cut a p (in.)
Depth of Cut a p (in.)
Feed Rate f (IPR)
Feed Rate f (IPR)
.0079 .0059 .0099 .0039 .0019
.0118
Grade
Binder CBN Content (%) Grain Size (μm) Hardness HV (GPa) Transverse Rupture Strength (GPa) Main Coating Components Coating Thickness (μm)
Features
Maintains ultimate cutting edge sharpness. Suitable for finishing of powdered metal. Grade exhibiting improved wear and fracture resistance in roughing of sintered materials.
Co Compound
Q Q
BN7500
90 to 95
1
41 to 44
2.0 to 2.1
Co Compound
Q Q
BN7000
90 to 95
2
41 to 44
1.8 to 1.9
Transverse rupture strength measured with test piece equivalent to insert CBN layer
Performance
● Grade Performance Comparison
D
Carbide
Carbide
.0275 .0236 .0197 .0157 .0118 .0079 .0039
■
12
.0197
■
■
D
Cermet
D
10
.0157
D
■
D
8
D
.0018
SUMIBORON
Cermet
D D
6
D D
D
.0079
Carbide
D
■
DD
4
D D SUMIBORON
■ D
D D
■ D
Cermet
.0039
SUMIBORON
2
D D
■
■
D D
0
165 330
500 650
0
0
165 330 500 650 Cutting Speed v C (SFM)
165 330 500 650 Cutting Speed v C (SFM)
Cutting Speed v C (SFM)
For general powdered metal, carbide and cermet grades can perform up to v
c = 330 SFM. However,
Work Material: SMF4040 equivalent Machining Details: ø80-ø100 heavy interrupted facing with grooves and drilled holes (after 40 passes) Tool Cat. No.: TNGA331 Cutting Conditions: f = .0039 IPR, a p = .0039" Wet
around v c =400 SFM, wear becomes rapid and surface roughness deteriorates with increased burrs. On the other hand, CBN (SUMIBORON) exhibits stability and superior wear resistance, burr prevention and surface roughness, especially at high speeds.
Valve Seat Ring (VSR)
*VSR has both (Intake: IN) and (Exhaust: EX) with the exhaust generally being hardened.
Recommended Grade
Recommended Cutting Conditions
● Recommended Grade by Machining Details
Gasoline VSR material
Diesel VSR material
Cutting Speed v c (SFM)
Feed Rate f (IPR)
Depth of Cut a p (inch)
BN7000 BN7500
BN7000 BN7500
BN350
BN350
Plunge cut
165 to 415 .0012 to .0079 .0020 to .0197
BN7000 BN7500
BN7000 BN7500
BN500
BN500
Traverse cut
Workpiece Hardness (HV)
Low
300HV
High
Low
300HV
High
Application Examples
With superior fracture resistance, the BN7000 can achieve double our competitors' tool life
BN7000
3,200 holes
Part Material: Powdered Metal (150 to 250 HV) Machining Details: VSR(IN) 45° Surface Finishing Tool Cat. No.: TBGN521B Cutting Conditions: v c =330 SFM, f = .0031 IPR Wet
Competitor's CBN
800 holes
L9
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