Technical Guidance
High Speed Machining of Cast Iron withs SUMIBORON SUMIBORON Edition

■ Advantages of Using SUMIBORON for Cast Iron Machining
● Higher Accuracy ● Longer Tool Life at Higher Cutting Speeds
Grey Cast Iron Ductile Cast Iron
BNS800 500
1,000 BN7000 BNX10


Cutting Speed (m/min)
Size Accuracy


Ceramic


Cutting Speed (m/min)
BNS800 Coated Carbide BN500
BN7000 Cermet
BNC500 BNC500
500 200



Ceramic BN7000
Good


200 Ceramic Coated Carbide
Coated Carbide Cermet
Cermet
0.4 0.8 1.6 3.2 1 10 20 1 10
Good ← Surface Roughness Ra (μm) Tool Life Ratio Tool Life Ratio


■ Turning
● Cast Iron Structure and Wear Shape Examples
Flank Wear Width VB (mm)


0.4 Work : FC250 Continuous cutting 10
FC FCD Dry


Surface Roughness
Wet (Water soluble) Tool material : BN500
0.3 Tool Shape : SNGN120408 8


Rmax (μm)
Conditions : vc=450m/min
6
Structure 0.2 ap=0.25mm
f =0.15mm/rev 4
0.1 Dry&Wet
(water soluble) 2
0 0
2.5 5 7.5 10 12.5 200 400
Matrix Pearlite Pearlite + Ferrite Cutting Length (km) Cutting Speed vC (m/min)
Tool Wear Shape


Wet Machine : N/C lathe
Wet Dry Work : FC250 200HB
(Water Holder : MTJNP2525
soluble) Tool material : BN500
Tool Shape : TNMA160408
Conditions : vc=110 to 280m/min
Dry f =0.1mm/rev
ap=0.1mm
Crater wear
Wet
For machining cast iron with SUMIBORON, cutting speeds (vc) should be
(vc = 200 to 500m/min) 200m/min and above. WET cutting is recommended.


■ Milling
SUMIBORON BN Finish Mill EASY
・High speed machining vc=2,000m/min
・Surface Roughness 3.2Rz (1.0Ra)
・Running cost is reduced because of economical insert.
・Easy insert setting with the aid of a setting gauge.
・Employs safe, anti-centrifugal force construction for high-speed conditions.

0.25 250
Ceramic Ceramic Cutting Conditions
vc=400m/min vc=600m/min p=0.5mm z=0.15mm/
0.20 200
Number of Passes (Pass)


Dry
Flank Wear width (mm)


0.15 vc=600m/min vc=1,000m/min 150


N 0.10 100

Thermal cracks occur.
Technical Guidance /


0.05 50
vc=1,500m/min
References


Wet
0.0 0
0 20 40 60 80 100 120 140 160 180 200 300 450 600 750 900 1,050 1,200 1,350 1,500
Number of Passes (Pass) Cutting Speed (m/min)

(Conditions) Dry cutting is recommended for high speed milling of cast iron with SUMIBORON.
・Work: FC250・Condition: ap =0.5mm fz =0.1mm/t Dry
・Tool material: BN7000


N28