Chipbreaker and Grade Selection Guide for Turning Hardened Steel
Hardened Steel
BNC2105 / BNC2115 / BNC2125 / BN1000 / BN2000
Grades
BNC2105: Grade for high-speed nishing.
Stable performance in high-speed machining of hardened steel, thanks to outstanding wear resistance. BNC2115: High-precision grade realizing long tool life with excellent surface roughness and stable machining. Maintains excellent surface roughness thanks to a coating with high notch wear resistance and tough CBN substrate. BNC2125: 1st recommended grade, balancing excellent wear resistance and fracture resistance in hardened steel machining. Along with a tough CBN substrate, the coating combines wear resistance and toughness to achieve long, stable tool life even in high-ef ciency and interrupted machining. BN1000: For high-speed machining, BN1000 provides the highest wear resistance of all uncoated SUMIBORON grades, improving fracture resistance while maintaining an emphasis on wear resistance. BN2000: General-purpose grade for general hardened steel machining with a high degree of fracture and wear resistance.
A
BNC2105 / BNC2115 / BNC2125
Performance
BNC2115
BNC2125
D Wear Resistance (Continuous Cutting)
D Fracture Resistance (High-load Cutting)
.0028
After Machining 6km
Rz 4.05µm
Stable Tool Life
.0024
Competitor's Coated CBN A
Competitor's Coated CBN A
.0020
BNC2125
After Machining 6km
Rz 2.91µm
BNC2115 Excellent wear resistance
.0016
.0012
Conventional Coated CBN
Conventional Coated CBN
.0008
After Machining 6km
Rz 2.80µm
Conventional Coated CBN
.0004
BNC2115 Flank wear suppressed
0
20
40
60
80
Cutting Time (minutes)
No. of Passes until Tool Fracture 0 200 400 600 800 1,000 1,200 1,400
Work Material: SUJ2 (58 to 62HRC) Tool Cat. No.: 4NC-DNGA150408 Cutting Conditions: vc= 492 SFM, f= .006 IPR, ap= .020”, 63m/times Wet
Work Material: SCM415H (58 to 62HRC) Tool Cat. No.: 4NC-DNGA150408 Cutting Conditions: vc= 656 SFM, f= .004 IPR, ap= .006”, Wet
BN1000 / BN2000
D Wear Resistance (Continuous Cutting)
D C hipping Resistance (Interrupted Cutting) (Conventional Tool A as 100%)
.010
Breakage Cannot Continue Breakage Cannot Continue
BN2000
Competitor's Product B
Compared to Conventional Tools, Approx. 1.4 x!
BN2000
.010 .008
BN2000
Competitor's Product B Breakage caused by crater wear Competitor's Product B Breakage caused by crater wear Competitor's Product B
Able to Continue
.008 .006
Conventional Product A Competitor's Product D
Able to Continue BN2000
.006 .004
BN2000
.004 .002
Breakage Life Improved
.002
0
Breakage Life Improved
60
80
100
20
40
Cutting Time (minutes)
0
60
80
100
20
40
Compared to Conventional Tools, Approx. 2 x!
BN1000
Cutting Time (minutes) Work Material: SCM415H Round Bar (58 to 62HRC) Insert: 2NU-CNGA120408 Cutting Conditions: v c =330 SFM, f =.004 IPR, a p =0.008”, Dry .006
BN1000 Competitor's Product C BN1000 Competitor's Product C
Conventional Product B Competitor's Product E
Competitor's Product C
.006 .0045
Competitor's Product C Unacceptable Amount of Wear
.0045 .003
BN1000
Unacceptable Amount of Wear
.003 .0015
BN1000
0
50
100
150
Excellent wear resistance!
.0015
Tool Life Ratio (%)
0
20
13 7 Cutting Time (minutes) 7 Cutting Time (minutes) 13
Excellent wear resistance!
0
20
Part Material: SCM415H 8V Grooved (58-62HRC) Insert: 2NU-CNGA120408 Cutting Conditions: v c=492 SFM, f =.004 IPR, a p=.008”, Dry
Part Material: SUJ2 Bearing Steel Round Bar (62HRC) Insert: 2NU-CNGA120408 Cutting Conditions: v c=492 SFM, f =.004 IPR, a p=.008”, Dry
A21
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