Page 121 - Threading_Handbook

2.13 High Pressure Coolant

The high pressure coolant feature has been in existence for a long time in the metal removal
world, taking a bigger role in today’s machining.

ISCAR was one of the first cutting tool companies to respond to market needs by designing THREAD TURNING
and producing tools for ultra high and high pressure coolant flow.
High pressure coolant was initially implemented mainly for difficult-to-machine materials such
as titanium, Inconel and other heat resistant alloys.

Later it was found that tool life, productivity and chip control can be improved
when machining stainless and alloyed steel.
Jet high pressure (JHP) tools are particularly important in the aviation,
aerospace and medical industries.

The usage of high pressure coolant is growing as manufacturers are looking for ways to
reduce cutting time, improve machining process reliability and achieve longer tool life.
ISCAR’s JHP tools provide all of these advantages.

How Does it Work?

The stream velocity of the coolant emitted from the pump
increases as the coolant holes become smaller.
When it emerges out of the tool through the nozzle, the velocity is
very high, exerting considerable force on the chips, lowering their
temperature and protecting the cutting edge from thermal shock.

High temperature alloys produce a very high temperature as they are being cut.
By effectively removing the heat, the chips become less ductile and easier to break.
Shorter chips are easily managed - they do not tangle around the workpiece
or machine parts, so there is no need to stop the process frequently.

Usually in conventional cooling the chip prevents the coolant from reaching
the insert rake face in the cutting zone. The coolant stream of the JHP
tools is directed precisely between the insert rake face and the flowing chip.
This results in longer tool life and a much more reliable process.

The coolant channels of the JHP tools feature outlets very close
to the cutting edges, with the following advantages:

• Shorter machining time - cutting speed may be increased by up to
200% when machining titanium and heat resistant alloys
• Longer tool life - tool life increases by up to 100% not only on titanium
and heat resistant alloys, but also on stainless and alloy steels
• Improved chip control - even on the most ductile and
problematic materials, small chips can be obtained
• Very effective cooling down of the cutting edge, reducing sensitivity to heat fluctuations
• Safer and more stable process JHP tools provide advantageous
performance also when conventional pressure is applied

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