Page 28 - Iscar Article 2_2017
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Grade Powders
When attempting to increase the rake, a tool Today, advances in powder metallurgy provides
designer seeks to incline the rake face of an insert many more opportunities for increasing both the
more aggressively with respect to its cutting edge. inclination of the rake face and the helix angle
However, in this area there is a serious limitation in of the cutting edge, all without loss of strength.
that this incline weakens the insert’s cutting wedge ISCAR’s insert H690 WNMU 0705 is a good
and therefore has a negative impact on strength. example of a steeply inclined rake face of an insert
with a difference in heights that enables lower
The helically-formed edge causes a difference power consumption. The increasing use of the
between the heights, which are measured in term “high positive”, when describing modern
adjacent corners of the insert. Producing such milling inserts, emphasizes the dynamic changes
uneven sintered products is not a simple task and in indexable topology. Such a definition reflects
its creation requires serious technological efforts. the current state of the art. As the production
of tools with cemented carbide inserts does not
TRIGON with steeply deplete topology resources, the “high positive“ of
inclined rake face today could be considered as “normal” tomorrow.
Increased optimization of the topology will lead to
an additional reduction in cutting power.
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