Machine ant hand grinding
In machine grinding, the workpiece
is firmly held by chucks and the grinding
operation is controlled by the machine
parameters set. In hand grinding,
the operator presses the tool against
the wheel. He guides the tool and
is better able to control the grinding
operation. Therefore, wheel speeds
in hand grinding can be higher than
those for machine grindig. Due to
these basic differences, both methods
require different cutting conditions.
The danger of the carbide becoming
too hot requires machine grinding
to be done wet and with low pressure.
The lattr is achieved by means of
reduced feed which as a rule should
be considerably below the respective
grain size. i.e. in the range of 0.005-0.02
mm per stroke.
For standard grinding
speeds please click here.
When using diamond wheels, the grinding
pressure can be reduced without changing
grinding conditions by selecting a
wheel with higher diamond concentration.
To establish proper grinding conditions
it is also necessary to consider the
grinoability of the carbide grace
in question.
Electrolytic grinding
This grinding method has been applied
with success in the machining of carbide
tools Material is removed by a combination
of electrochemical dissolution and
mechanical grinding action. Advantages
are high removal rates and excellent
surface quality, inparticular at the
cutting edge. Economy of this method,
however depends on a sufficiently
large work-to wheel contact area.
Grinding experience has shown that
combined grinding of carbide tip and
shank is limited by economical considerations.
Whenever possible, only the carbide
tip should be ground electrolytically.
When making new tools, the different
clearance angles ot shank and tip
and the milling of the shank and promote
electrolytic grinding. For regrinding
operations which require extensive
material removal, the shank should
be adeqalety machined off prior to
the regrinoing of the carbide tip.
Brazing
Carbide Tips
