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| Price | negotiation |
| MOQ | negotiation |
| Delivery Time | within 10 working days |
| Brand | AOJIA |
| Place of Origin | CHINA |
| Certification | ISO |
| Packaging Details | Inner packing plastic bag, outer packing superhard carton |
| Payment Terms | L/C |
| Place of Origin | CHINA | Packaging Details | Inner packing plastic bag, outer packing superhard carton |
| Grade | Customer's Request | Hardness | Super Hard |
| Certification | ISO | Name | cnc inserts |
| Brand Name | AOJIA | Payment Terms | L/C |
| Type | Turning | Advantage | High Cutting Performance |
| Price | negotiation | Delivery Time | within 10 working days |
| Minimum Order Quantity | negotiation | Coating | CBN |
CBN Inserts For Hard Turning
Handling
of
raw
materials
Because
there
are
impurities
such
as
WBN,
HBN,
pyrophyllite,
graphite,
magnesium,
iron,
etc.
remaining
in
the
CBN
micropowder;
in
addition,
it
and
the
binder
powder
both
contain
adsorbed
oxygen,
water
vapor,
etc.,
which
are
unfavorable
for
sintering.
Therefore,
the
purification
method
of
raw
materials
is
one
of
the
important
links
to
ensure
the
performance
of
synthetic
polycrystalline.
During
the
development,
we
used
the
following
methods
to
purify
the
CBN
powder
and
binder
materials:
first,
treat
the
CBN
powder
with
NaOH
at
about
300
C
to
remove
pyrophyllite
and
HBN;
then
boil
perchloric
acid
to
remove
graphite;
The
plates
were
boiled
to
remove
metals
and
washed
with
distilled
water
until
neutral.
Co,
Ni,
Al,
etc.
used
for
the
binder
are
subjected
to
hydrogen
reduction
treatment.
Then,
the
CBN
and
the
binder
are
mixed
uniformly
according
to
a
certain
ratio
and
incorporated
into
the
graphite
mold,
then
sent
to
a
vacuum
furnace
with
a
pressure
less
than
1E2,
heated
at
800-1000°C
for
1
hour,
and
removed
the
dirt
on
the
surface,
adsorbed
oxygen
and
water
vapor,
etc.,
so
that
the
The
surface
of
CBN
grains
is
very
clean.
In
terms
of
the
selection
of
binder
materials
and
the
addition
amount,
the
total
amount
of
binder
added
should
be
sufficient
but
not
excessive.
The
experimental
results
show
that
the
wear
resistance
and
flexural
strength
of
polycrystalline
are
closely
related
to
the
mean
free
path
(the
thickness
of
the
binder
phase
layer).
The
dosage
of
the
agent
is
10%
to
15%
(mass
ratio).
In
addition
to
the
selection
of
binder,
the
determination
of
CBN
particle
size
and
particle
size
ratio
is
also
crucial.
According
to
the
requirements
of
machining
accuracy
and
surface
quality,
the
particle
size
of
CBN
used
for
manufacturing
cutting
tools
is
roughly
divided
into:
coarse
particle
size
20-30
μm;
medium
particle
size
3
~10
microns;
fine
particle
size
2
microns.
Polycrystalline
made
of
coarse
grain
is
difficult
to
make
into
a
tool
with
high
precision
requirements,
but
its
wear
resistance
and
impact
resistance
are
high,
and
polycrystalline
made
of
fine
grain
can
meet
the
requirements
of
finishing
and
super
finishing.
1.embryo body synthesis
The
PCBN
composite
sheet
is
directly
compounded
with
the
CBN
layer
and
the
cemented
carbide
substrate
under
high
temperature
and
high
pressure,
and
is
made
into
various
welding
forming
cutting
tools
or
blades
through
cutting
and
welding
processes.
Integral
PCBN
sintered
block
is
directly
sintered
without
alloy
matrix
to
become
integral
PCBN
blade.
After
sharpening,
cubic
boron
nitride
integral
polycrystalline
blade
is
made.
As
shown
in
"PCBN
composite
sheet".
Synthesis
equipment
Most
of
the
synthetic
equipment
used
abroad
are
two-sided
top
presses,
and
most
of
them
are
six-sided
top
presses
in
China.
2.Grinding process of PCBN tool
The produced PCBN tool blank needs to be sharpened for cutting, and the sharpened tool obtains the correct geometry and surface finish. Generally divided into rough grinding, fine grinding and grinding processes. 180-240 resin-bonded diamond grinding wheel is used for rough grinding, with a feed of 0.01 mm/double stroke; Wlo-W14 resin-bonded grinding wheel is used for fine grinding, with a feed of 0.005 mm/double stroke; for grinding For diamond grinding wheel or grinding paste of W5~W3, special attention should be paid to the influence of cutting edge dressing of diamond grinding wheel on grinding. Although the tool swings back and forth on the entire end face of the grinding wheel during the sharpening process to make the surface consumption of the grinding wheel uniform, in fact, the surface of the grinding wheel is still prone to unevenness, which must be frequently trimmed.
3.Geometric parameters of PCBN tools
The life of a PCBN tool is closely related to its geometric parameters, and a suitable front and rear angle can improve the impact resistance of the tool. Chip removal capacity and heat dissipation capacity. The size of the rake angle directly affects the force of the cutting edge and the internal stress state of the insert. In order to avoid the excessive tensile stress caused by the mechanical impact of the tool tip, a negative rake angle (-5.～-10.) is generally used. At the same time, in order to reduce the wear of the relief angle, the main and auxiliary relief angles are 6. , the corners are rounded with a nose radius of 0.4–1.2 mm, and the edges are ground smooth.
4.Inspection of PCBN tools
In addition to testing physical properties such as hardness index, bending resistance, tensile strength, etc., it is also necessary to use a high-power electron microscope to check the surface and edge processing accuracy of PCBN tools. Then it is dimensional inspection, precision inspection, M value, geometric tolerance, roughness, and then packaging and storage.
