CBN

Product News No.054

Solid CBN

BNC8115/

CoatedSUMIBORONSUMIBORON

BNS8125
Rev. 2

From Roughing to Finishing ofCast Iron, Exotic Alloy Cast Iron,and Hardened SteelInserts with holes
BNC8115

BNS8125

Lineup of 12 items

Coated SUMIBORON/SUMIBORON

From Roughing to Finishing of Cast Iron,
Exotic Alloy Cast Iron, and Hardened Steel(Hard-to-cut)█ Application Range

Cutting Speed vc (m/min)Gray Cast Iron
Finishingregion

Roughing region

2,500
2,000

BN70001,500

BNC8115
BNS81251,000
500

BN5000

BNS800

1.0

2.0

4.0

3.0

Depth of Cut ap (mm)100% S
100%Solidolid CCBN
BN S
Structuretructure

Ductile Cast Iron

Hardened Steel

Cutting Speed vc (m/min)Cutting Speed vc (m/min)

Wet machining is recommended for gray cast iron
For dry machining, BNC8115/BNS8125 are recommended for both roughing and ﬁnishing

500
400

BNC500300

BNC8115200

BNS8125

BN7000

00.5

1.0

1.5

2.0

2.5

300
250 BNC2115
BNC2125

BNC2010200 BNC2020
BNC300150

BNC81151005003.00.51.01.52.02.53.0

Depth of Cut ap (mm)Depth of Cut ap (mm)█ Choosing Between BNC8115 and BNS8125 (Cast Iron/Hardened Steel)Work Material

Coated SUMIBORON

SUMIBORONSUMIBORON

Coated SUMIBORON

Coated SUMIBORON

BNC8115

BNS8125

BN7000

BNC500

BNC2125

Turning

Turning

Turning

Turning

Turning--

Depth of Cut
0.5mm
or below--

Depth of Cut
0.5mm or below
High-speed
Machining

Milling

Milling

Grey
Cast Iron

BestBest
Economical

DuctileCast Iron

Depth of Cut
0.5mm
or above

Interrupted
Machining

Hardened
Steel

Depth of Cut
0.5mmor above

Milling

Depth of Cut
1.0mm or below
High-speed
Finishing
Depth of Cut0.5mm or below
Low-speed
machining--: Recommendation2

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125
Coated SUMIBORON

BNC8115
PVD coating with excellent wear resistancesuppresses ﬂank wear in machining of exotic alloy
cast iron and hardened steel
Ideal for roughing and 0.5mm to 3.0mm depths ofcut can also be used for roughing and ﬁnishing ofgrey cast ironGold-colored coating for improved visibility of usedcorners█ Wear Resistance (Ductile Cast Iron Machining)

Flank Wear Width (mm)

Adopts a PVD coating with excellent wear resistance in ductile cast iron machining
Significantly suppresses flank wear compared to conventional solid CBN0.20█

Improved wear resistance

Conventional Tool0.16█

0.120.08

█

0.04

█

DD0█

█

DDDD

BNC8115

D0.5

1.0
1.5
2.0(km)Cutting Distance

2.5

BNC8115(After Cutting 2.5km)

Conventional Tool(Uncoated)(After Cutting 2.5km)

Work Material: FCD450 (Round Bar) Tool Used: SNGN090308
Cutting Conditions: vc = 300m/min, f = 0.2mm/rev, ap = 0.2mm Wet█ Wear Resistance (Hardened Steel Machining)

Flank Wear Width (mm)The use of PVD coating with excellent wear resistance on a high-strength solid CBN substraterealises high fracture resistance and wear resistance even in hardened steel machining
0.4

█

0.3

Improved wear resistance

Conventional Tool

█

0.2

█
█

0.1
0

BNC8115
0.5

1.0
1.5
2.0
Cutting Distance (km)2.5

BNC8115(After Cutting 0.5km)

Conventional Tool(Uncoated)(After Cutting 0.5km)

Work Material: SUJ2 58-62 HRC (Round Bar) Tool Used: SNGN090308
Cutting Conditions: vc=150m/min, f=0.2mm/rev, ap=0.3mm Wet3

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125
SUMIBORON

BNS8125
Optimising the particle size distribution of the CBNparticles has resulted in improved chipping resistanceand longer life while maintaining wear resistanceduring grey cast iron machining█ Wear Resistance (Grey Cast Iron Machining)

Flank Wear Width (mm)Optimised grain size distribution of CBN particles
Realises excellent wear resistance in high-efficiency grey cast iron machining
0.16

Competitor'sProduct0.12

█
█0.08

█
█

Improved wear resistance████BNS8125

0.04010203040(km)Cutting Distance

50BNS8125(After Cutting 45km)

Competitor's Product(Uncoated)(After Cutting 45km)

Work Material: FC300 (Round Bar) Tool Used: SNGN090308
Cutting Conditions: vc = 800m/min, f = 0.1mm/rev, ap = 0.2mm Wet█ Fracture Resistance (Ductile Cast Iron Machining)
Use of high-strength solid CBN substrate improves fracture resistance
Suppresses chipping to realise longer tool life
Improved cutting edge
line chipping

BNS8125(After Cutting 9.0km)

Conventional Tool (Uncoated)(After Cutting 9.0km)Work Material: FCD450 (Round Bar with 2 V-grooves) Tool Used: SNGN120408
Cutting Conditions: vc = 200m/min, f = 0.2mm/rev, ap = 0.5mm Wet

4

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125█ Stock Items█ Cutting Edge Speciﬁcation

Solid Insert / Negative (With Hole)

BNC8115

Cat. No.

BNS8125

Appearance

BNC8115

Stock

Dimensions (mm)Standard/Wiper Insert W type

Inscribed
HoleThickness
CircleDia.

NoseRadius

CNGA 120408
CNGA 120412

D D
D D12.7

4.76

5.16

0.8
1.2

SNGA 120408
SNGA 120412

D D
D D12.74.76

5.16

0.8
1.2

TNGA 160408
TNGA 160412

D D9.525
D D4.76

3.81

0.8
1.2

Cutting Edge specification
identification code

20˚S02020
0.20mm(With) Honing

BNS8125
Standard/Wiper Insert W type

Solid Insert / Negative (Dimple Lock)
Cat. No.

BNS8125

Appearance

BNC8115

Stock

Cutting Edge specification
identification code

Dimensions (mm)Inscribed
HoleThickness
CircleDia.

20˚T02020

NoseRadius

CNGX 120412
CNGX 120416

D D
D D12.7

4.76

-1.2
1.6

SNGX 120412
SNGX 120416

D D
D D12.74.76-1.2
1.60.20mm
No Honing

For the above products, use Tool Holder for Solid SUMIBORON XCLN Type/XSBN Type (Dimple Lock).

Solid Insert / Negative (Without Hole)BNS8125

Appearance

Dimensions (mm)BNC8115Stock

CNGN 090308
CNGN 090312
CNGN 120408
CNGN 120412
CNGN 120416
DNGN 110308
DNGN 110312

DDDDDDDD9.525
DDD 12.7
DD9.525
DRNGN 090300
RNGN 120300
RNGN 120400
SNEN 090308W *DDDDD 9.525
D 12.7
D 12.7
D 9.525

SNGN 090308 *SNGN 090312 *SNGN 120308
SNGN 120312
SNGN 120408
SNGN 120412
SNGN 120416
SNGN 120420
TNGN 110308
TNGN 110312
TNGN 160408
TNGN 160412
TNGN 160416
TNGN 160420

DDDDDDDDDDDDDDD9.525
DD12.7
DDD12.7
DDD6.35
DDD9.525
DDCat. No.

Inscribed
HoleThickness
CircleDia.

Nose
Radius
0.8
1.2
0.8
1.2
1.6
0.8
1.2

3.18

-

4.76

-

3.18-

3.18
3.18
4.76
3.18-

---

3.18-

3.18-

4.76-

3.18-

4.76----0.8

Wiper

0.8
1.2
0.8
1.2
0.8
1.2
1.6
2.0
0.8
1.2
0.8
1.2
1.6
2.0

* Can be used with SUMIBORON Cutter for High-speed Cast Iron Machining RM type.
-W: Wiper Insert

D mark: Standard stocked item

5

D mark: Standard stocked item (expanded item)

Wiper: Wiper insert

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125█ Application Examples of BNC8115
FC250 Brake DiscTurning

High fracture resistance suppresses ﬂaking, achieving 1.3x or longer tool life compared withcompetitor’s CBNAble to Continue

Output (pcs)800

Flaking

Able toContinue

600
400
2000

BNC8115 Competitor's
Product A

BNC8115
Competitor's CBN A
After machining 650 pcs After machining 500 pcs

Tool Used: SNGN120416 (BNC8115)
Cutting Conditions: vc=250m/min, f=0.4mm/rev, ap=2.5mm Wet

SNCM (Heat-treated) Large Bearing

TurningHigh-wear resistance coating suppresses ﬂank wear, achieving twice or longer tool life comparedwith competitor’s CBN

BNC8115After 2 passes
Tool Used: RNGN120400 (BNC8115)
Cutting Conditions: vc=150m/min, f=0.3mm/rev, ap=2.5mm Wet6Competitor's CBN B
After 1 pass

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125█ Application Examples of BNS8125
FC250 Brake DiscTurning

6x tool life with ceramic tools; good wear resistance

Output (pcs)100

90 pcs50

15 pcs0

BNC8125 Competitors'Ceramics

BNS8125
After machining 90 pcs

Tool Used: TNGN160412 (BNS8125)
Cutting Conditions: vc=300m/min, f=0.4mm/rev, ap=1.0mm Wet

Centrifugal Cast Iron Cylinder Bore

MillingHigh fracture resistance suppresses ﬂaking, achieving 1.2x or longer tool life compared withcompetitor’s CBNFlaking

BNS8125
After machining 100 pcs

Competitor's CBN C
After machining 80 pcs

Tool Used: SNGN090312 (BNS8125) Cutter: Special Boring Cutter
Cutting Conditions: vc=1,000m/min, vf=2,000mm/min, fz=0.6mm/t, ap=0.05mm Wet

FC250 Cylinder BlockMillingHigh fracture resistance suppresses ﬂaking, achieving 1.5x or longer tool life compared withcompetitor’s CBNAble to Continue

Flaking

BNS8125
After 1.5 hours'machining

Competitor's CBN D
After 1.0 hours'machining

Tool Used: SNGN120412 (BNS8125) Cutter: Diameter ø125mm (10-ﬂute)
Cutting Conditions: vc=1,000m/min, vf=2,600mm/min, fz=0.1mm/t, ap=1.0mm Remainder Wet

7

Coated SUMIBORON/SUMIBORON

BNC8115/BNS8125█ Recommended Cutting Conditions (Turning)
Cast Iron
Cutting Conditions

Min. - Optimum - Max.

Work Material

GradeGrey Cast Iron

BNC8115 / BNS8125≤ 4.00.10 - 0.50 - 1.00

200 - 1,000 - 2,000

BNC8115≤ 3.00.10 - 0.30 - 0.50

80 - 160 - 300

BNS8125≤ 3.00.10 - 0.30 - 0.50

80 - 120 - 200

Depth of Cut ap (mm) Feed Rate f (mm/rev) Cutting Speed vc (m/min)

Ductile Cast Iron

Coolant: Dry/Wet

Hardened SteelWork Material

GradeHardened Steel

BNC8115

Cutting Conditions

Min. - Optimum - Max.

Depth of Cut ap (mm) Feed Rate f (mm/rev) Cutting Speed vc (m/min)≤ 3.0

0.10 - 0.25 - 0.40

50 - 100 - 150
Coolant: Wet█ Recommended Cutting Conditions (Milling)
Cast Iron
Cutting Conditions

Work Material

GradeGrey Cast Iron

BNC8115 / BNS8125

Min. - Optimum - Max.

Depth of Cut ap (mm) Feed Rate f (mm/rev) Cutting Speed vc (m/min)≤ 4.0

0.10 - 0.50 - 1.00

800 - 1,400 - 2,000
Coolant: Dry< SAFETY NOTES >Very hot or lengthy chips may be discharged while themachine is in operation. Therefore, machine guards, safety
goggles or other protective covers must be used. Fire safety
precautions must also be considered.

Please handle with care as this product has sharp edges.
Improper cutting conditions or mis-handling of the tool may resultin breakages or projectiles. Therefore, please use the tool within its
recommended conditions.

When using non-water soluble cutting oil, precautions
against ﬁre must be taken and please ensure that a ﬁreextinguisher is placed near the machine.

Hardmetal Division
Global Marketing Department : 1-1-1, Koyakita, Itami, Hyogo 664-0016, Japan
Tel: +81-72-772-4535
Fax: +81-72-771-0088
https://www.sumitool.com/globalR(2022.01) II 2010 SN/PL