Page 34 - Tungaloy Catalog

PCBN (T-CBN)

Polycrystalline Cubic Boron Nitride Compacts (PCBN), T-CBN
1

Hard
Cast lron Superalloys Materials
Grades Coated solid T-CBN T-CBN Coated T-CBN T-CBN
T-CBN
BXM10
Increasing wear resistance (hardness) Increasing impact resistance (toughness) BXC90 BX90S BX930 BX950 BX870 BX950 BX480 BX470 BXM20 BX310 BX330 BX530 BX360 BX380

The PCBN material is sintered under ultra high-pressure and Multi-corner BXC50 Multi-corner
temperature with cubic boron nitride particles and a special binder. Negative insert Positive insert
The hardness is more than twice that of cemented carbide, with the
hardness at high temperature exceeding that of cemented carbide.
CBN has no tendency to react with ferrous materials (different to
diamonds). This makes it suitable for high speed cutting of cast iron,
the finishing of hardened steel, cast iron, ferrous sintered metals
and valve seats etc. This material is also suited to finish machining
of super heat resistant alloys. The use of CBN sintered materials
improve the surface finish and accuracy, making finishes comparable
to grinding.
Transverse
Application Grades Microstructure Hardness rupture strength Features
(Hv)
(GPa)
Coated grade for high speed continuous or
interrupted machining
BXC90 3900 ~ 4100 1.80 ~ 1.90 Medium grained CBN particles are bound
with special binder. The surface is coated
with dedicated coating material.
PCBN grade for machining grey and ductile
BX930 3000 ~ 3200 0.95 ~ 1.20 cast irons
Features closely calculated CBN content and
medium sized CBN particles bound with special
binder. Excels in impact resistance.
High CBN content grade for high speed
BX950 3900 ~ 4100 1.80 ~ 1.90 machining
PCBN grade featuring a high CBN content
with cobalt alloy binder.

Cast lron For machining cast iron cylinder liners
BX870 3000 ~ 3200 0.95 ~ 1.20 Excellent wear resistance and tool life when
machining cast iron liners.

CBN grade for centrifugally cast iron
machining
BX910 2600 ~ 2800 0.80 ~ 0.90 With excellent wear resistance, BX910
provides long and stable tool life while
machining centrifugally cast iron, like cylinder
liner, at high cutting speed.

PCBN grade for machining cast irons
BX850 3300 ~ 3500 0.75 ~ 0.85 General purpose, cast iron machining grade
featuring excellent impact resistance.

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