For reasons of economy, tools should
be brazed in large lots rather than
individually, and the pertipent operations
(shank identification, grinding or
lapping the carode seabog face, cleanog
the faces to joined, cutting the solder
to size etc.) should be carried to
the point where brazing can be done
without interruption.
The operation itself starts with the
carbide tip, solder and, it convenient,
wire netting being placed on the tip
seat, flux being generously supplied
to the whole joint. This done, heat
is applied quickly and uniformly,
with the addition of more flux it
necessary. To avoid oxidation, for
all methods except brazing under inert
gas, the time for heating up should
not exceed 5 minutes. It the brazing
temperature is too low, it causes
imcomplete brazing; if it is too high,
it will burn the solder. The flowing
time of the solder must also be observed
to guarantee wetting of the entire
brazing area and displacement of all
flux from the brazing clearance, giving
the solder enough time to develop
a proper bond. Incipient flow can
be recognized by the sudden lustre
of the solder When the tool has been
taken oyt of the brazing heat, the
BÖHLER tip should be pressed against
its seat with a thin rod until the
solder has solidified. Slow cooling
will reduce brazing stresses, is achieved
by burying the tools in mica dust,
coke breeze, special earth, or dry
sand.
Since the quality of the cutting edge
governs tool life as well as surface
quality and accuracy of the workpiece,
its perfect condition is mandatory
for working economically with BÖHLER
tools. To produce a proper cutting
edge, you will need well trained operators,
suitable machines and the right type
of grinding wheels.
The most important requirements is
a stable, firmly bedded grinding machine.
Next in importance is the true running
of the wheel which calls for regular
trueing in due time. Often, unstatisfactory
performance of carbide tools is the
result of faulty grinding. We suggest,
at least for larger machining shops,
to arrange for a centralized regrinding
of their carbide tools by qualified
operators. The high hardness of BÖHLER
carbides calls for carborundum or
diamont wheels. The softer steel shank
may be ground with corundum wheels.
When deciding on procedure and wheel
type, always follow the grinding instructions
of abrasive wheel manufacturers.
Brazing
Carbide Tips
