FAQ's for CBN (BN500, BN600 & BNS800)
on Cast Iron machining
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tools for Cast Iron Machining?
Answer: Cast iron
material being highly abrasive in
nature with high content of carbon
in form of graphite makes the hardmetal
(Carbide, coated carbide) tools
wear quite fast & CBN
being most wear resistant material
(exceeded in hardness only by diamond)
gives excellent surface finish,
increases the productivity by reduction
of cycle time & tool change
frequency/time, able to machine
components with close tolerance
consistently when applied to CI
What are the characteristics
, which makes it Ideal
for Cast Iron Machining?
is the hardest material recommended
for cast iron machining. Its property
of excellent thermal conductivity
& thermal resistance make it
ideal for CI machining at higher
speed when the temperature of machining
goes higher & other tool materials
What is benefit
one can get by using CBN
Cast Iron as compared to conventional
usually gives life of 15 to 50 times,
finish achievable up to Ra 0.6 ~0.8
m & Tolerance up to class 6~7
is achievable quite consistently.
CBN also can be used at a speed
range of 200~2000mtr/min by which
reduction in cycle time or increase
in productivity is possible.
recommended for Cast Iron Milling
also, if yes what are the benefits
& its limitations?
Answer: Yes, CBN
can be applied for finish milling
of cast iron with BN Finish Mill
& BN 600 Inserts. It can achieve
a surface finish of Rmax 3.2 (Apx.
Ra 0.8m) better flatness, good
productivity & reduction in
tool change time. Cylinder Block
& head, Transmission case
Machine-housing joining faces
& machine bed is the ideal
application for it. The conditions
for BN Finish mill are speed 800~2000Mtr./min,
absolute dry condition, &
depth of cut less than 0.5mm.
BNS800 (new solid CBN
grade) inserts can be used for
general milling of cast iron also
for the conditions Speed800~2000mtr./min,
depth of cut up to 4mm & federate
| Ques: CBN
for Cast Iron
Machining should be used in dry or
Answer: We recommend using
of soluble coolant always in continuous
or interrupted turning for cast
iron machining with CBN grades
of BN500 & BN600. Whereas
we recommend absolute dry condition
for Cast Iron Milling with BN
Finish Mill & BN 600 grade.
Also with new solid CBN
Grade BNS800 one can machine Cast
iron in both dry & wet condition.
Can we use
for CI finishing at a speed
less than 200mtr./min?
Answer: CBN tools can
be used at a lower speed also,
but the cutting forces are much
higher at a speed less than 200mtr./min
cutting force gets stabilized
at a speed near to speed of 200mtr/min.
So is the surface finish, it is
very difficult to get good surface
finish for which CBN tools
are used for Cast Iron machining
at speed less than 200mtr./min.
What is the Grade
& cutting Conditions recommended
for SG or Nodular Cast Iron?
Answer: We recommend to
use BN 500 Grade for SG or Ductile
Cast Iron for continuous or interrupted
turning in wet condition at a
speed range of 150~350mtr./min.
We also recommend the use of BNX10
for continuous turning at a speed
range of 250~500mtr./min.
What are the usual
components & applications where
tools are used?
Answer: All the component
made of CI where fine finish,
close tolerance & high productivity
is desired CBN can be the
ideal selection e.g. precision
bearing bores, Cylinder Block
liner or parent bore, Flywheel
boring, Brake Disc facing, face
milling of Cylinder Block &
Head where fine finish & flatness
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