Carbide Brazed Tips B2 For Making Forming Tools For Machining
Concave Radii And Forming Turning Tools For Railway Wheel
Application: Brazing Carbide Inserts For Making Forming Tools For
Machining Concave Radii And Forming Turning Tools For Railway Wheel
| Type | Dimension(mm) |
| L | t | S | R | e | a° |
| B208 | 8 | 8 | 3 | 4 | - | - |
| B210 | 10 | 10 | 3.5 | 5 | 0.8 | 14 |
| B212 | 12 | 12 | 4.5 | 6 | 0.8 | 14 |
| B214 | 14 | 16 | 5 | 8 | 0.8 | 14 |
| B216 | 16 | 20 | 6 | 10 | 0.8 | 14 |
| B220 | 20 | 25 | 7 | 12.5 | 0.8 | 14 |
| B225 | 25 | 30 | 8 | 15 | 0.8 | 14 |
| B228 | 28 | 35 | 9 | 17.5 | 0.8 | 14 |
Drawings as below:
Production and test of Carbide Brazed Tips:
1)Carbide Brazed Tips will start to prepare the powder as per the customer’s requirement
with our wet-grinding machine
2) Before mass production, we need to do a trial pressing and sintering, and we check the
appearances and the sizes of the samples with a micrometer to
ensure that the requirements of the drawings can be met before
batch production
3) Bulk production, press the raw materials to shape blanks, and
carbide tips must be passed by semi-finished inspection.
4) sinter blanks to finish (HIP) and finished products inspection
to ensure the best quality and production capacity.
A guide to the applications of cemented carbide brazed tips
The structure of brazed tips tools should be tough enough.
Enough toughness shall be guaranteed by the maximum allowable sizes
of the tips and by using a rather strong steel grade and heat
treatment.
Cemented carbide tips should be strongly fixed securely.
The cemented carbide tips should have a secure fixation and it is
guaranteed by the Flutes of the tool holders and the quality in
welding, so the flutes of the tools holders must be selected based
on the shapes and the geometrical parameters of the tips.
Before welding of the tips to the tool holders, a check must be
done on the tips And the tool holders. An initial check must be
done to ensure that there is no serious bending on the support
surface of the tips. There shall be no serious carbulization on the
welding surface of the tips and at the same time the contaminants
on the surface of the tips and in the flutes of the tools holders
must be eliminated to ensure the quality of a secure welding.
There are requirements for the welding materials.
In order to endure the toughness of the welding, a suitable welding
material must be selected During the welding, good wettability and
flowability must be guaranteed and the air bulbs must be got ridden
of in order to ensure the sufficient contact of the welding
material and the surface of the tips to be welded leaving nothing
to be welded.
There are requirements for the flux in the welding process.
It is recommended that industrial borax is to be used. Before the
use of the borax, it should be dewatered in a drying oven and then
milled and sieved to get rid of the foreign objects.
During the welding of cemented carbide tips of fine grain size with
high titanium and low cobalt content and long and thin cemented
carbide tips it will be recommended that compensation shims of a
thickness of 0.2-0.5mm or similar shims with holes of 1-2mm in
order to reduce the stress in the welding process.
As cemented carbide tips are rather brittle and are most sensitive
to the formation of cracks, excessive heating or rapid cooling must
be prevented in the grinding of the tools and at the same time,
grinding wheels with appropriate grain size and hardness must be
selected and a proper grinding technique to avoid cracks in the
grinding of the edges of the tips and not to affect the lifetime of
the tools.
When the tools are installed, the length of the tips outstretching
the tools must be as less as possible, as otherwise, the vibration
of the tools will occur thus damaging the cemented carbide tips.
When the tools come to a normal bluntness, they must be reground,
The edges and the radius of the edges must be ground with oil
stones after the tools are ground to increase the lifetime and
reliability of the tools.
