stories on hard material matters - Ceratizit S.A.

34
COATED CBN
imp:act 01/08
CERATIZIT successfully applies CBN
with a world innovation coating
On the occasion of AMB (9 th -13 th September, Stuttgart, Germany)
CERATIZIT will for the fi rst time present a coated CBN
(cubic boron nitride) material.
In 1969 GE (General Electric) launched cubic boron nitride
for the fi rst time under the name ‚Borazon’ as a revolutionary
development in the fi eld of extremely hard grinding
material. CBN does not occur naturally, but is produced
synthetically (high-pressure synthesis) and, with a hardness
twice as high as silicon carbide (SiC) after diamond ranks
as the second hardest material.
CERATIZIT supplies the most important producer of CBN
materials with the tools necessary for high-pressure
synthesis (anvils and dies).
CBN has been known as a cutting material for over 30
years and shows its strengths particularly when turning
hard materials (hardness > 58 HRC), such as hardened
steel or chilled castings: CBN is characterized by extreme
hardness and excellent heat resistance as well as suffi cient
toughness for this application area.
CERATIZIT has been selling CBN inserts for many years. The
product range also includes milling tools to an increasing
degree. The stress the tools are subjected to during
these milling operations is caused by interrupted cut,
thermal changes and oxidation, and represents one of
the threshold applications of CBN.
The new HyperCoat grade CTL3215 – CBN has a new lease
of life
Thanks to the application of a suitable and functional
coating, the milling range has been extended as both
process security and tool life have signifi cantly been
increased. Furthermore it has become evident that
these improvements also have a positive impact on
turning operations of grey cast iron and steel castings
under diffi cult conditions.
HyperCoat coating is the secret
CERATIZIT has developed and patented a specifi c
PVD coating for CBN cutting materials. This innovative
coating is the answer to the complex demands on a material
applied in milling operations which are characterized
by stress variation, thermal shock and oxidation. The
recently developed coating is based on an innovative
composition which shows signifi cantly better resistance to
oxidation and simultaneously excellent wear resistance,
especially when it comes to high application temperatures.
Compressive stress resulting from the PVD coating procedure
provides the new HyperCoat coating with higher
toughness and last but not least with more reliability for the
tooling system.
CTL3215 ensures success
Thanks to CERATIZIT’s coating approach the application
range of CBN tools has been substantially extended. At
last it is now possible to mill also hardened steel and cast
iron in a notably better way. The coated CBN solution
from CERATIZIT will mainly be applied for fi ne or medium
milling operations with cutting speeds up to 1,000 meters
per minute, depending on the application. The tooling
solution therefore requires stable machining conditions
and is applied without cooling lubricant. In general tool
life is increased by 30 to 40 % compared to uncoated
CBN.