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Hardened Steel Machining
Precision Cast Iron Machining
Grades
Advantages
Application Examples
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Roll Turning
Valve Seat Machining
Heat Resistent Alloy Machining

INTEGRATED MACHINING SOLUTIONS

Conventionally for cast iron as well as sg iron carbide tools in coated as well as uncoated grade are used. Low cutting speeds as well as less tool life are the 2 constrants which makes cast iron machining more tedious and high machining cost. Sumitomo has made pioneering efforts in usage of CBN as a cutting tool material in general and cast iron machining in specific. Their long experience of tool failure analysis and efforts to improvement tool life with changing grade compositions, binders, alloys, coating and edge treatment has resulted in 4 different grades for cast iron as well as ductile cast iron machining. Motherson CBN being most hard material ideally recommended first choice for higher speed, same resulted in productivity, efficency and lower machine cost for area of cast iron. Motherson CBN encures excellent surface finish, reduction in cycle time, reduction in tool change time, consistency of bore while machnining long lengths in close tolerances. Sumitomo offering BNX10, BN500, BN600 and a Grade BNS800 which covers the whole range of cast iron compositions.

Application areas as well as recommended parameters for excellent benefits are given below for your ready reference.

Our Network of direct sales engineers are an unparalleled and invaluable resources of technical tooling application and advice to be consulted for best results from sumitomo various grades.

 
GREY CAST IRON
SG IRON/DUCTILE CAST IRON

Work Material
AISI 35, GG25
AISI 40, GG30 
Alloy Cast Iron
60/40/8,GGG40
100/70/03,
GGG70
Hardness (HB)
180
250
150
300
Graphite
Flaky Graphite
Spherical Graphite
Matrix
Ferrite + Pearlite
Pearlite
Pearlite
Ferrite
Ferrite + Pearlite
Pearlite
Parts Examples
Housing
Starter
Brakedisk
Engine Block
Scroll
Compressor
Brakedrum
Liner
Housing
Differential Case Knuckle
Recommended Conditions Feed Rate:0.1~0.5mm,
D.O.C.:1mm
Feed Rate:0.1~0.4mm,
D.O.C.:0.5mm
WET
WET

Gray Cast Iron