MACHINING & MACHINERY
CRAZYDRILL COOL SST-INOX
MIKRON TOOL
WITH THE RIGHT COOLING AND GEOMETRY:
DRILLING UP TO 40XD IN ONE STROKE – FOR
STAINLESS AND HEAT RESISTANT STEELS
Small, deep and fast, these are the
characteristics of the small drill CrazyDrill
Cool SST-Inox. Due to internal coolant
ducts, innovative geometry and coating,
the machining of stainless steels, nickel
based super alloys and CrCo-alloys has
become significantly simpler and process
stable. This goes also for small diameters
as well as deep holes. The range includes
drills in diameters from 1 to 6 mm and
working lengths up to 40 x d.
So far nothing special. Drills with
spiralized coolant ducts are available
already; even in small diameters. However,
many get into trouble with tough-
elastic materials or with the poor heat
conductivity of super alloys. Here the
cooling through “classic” round ducts is
insufficient even with high pressure. A
premature edge chipping, packing of
chips, buildup of the flutes prevents a
process stable drilling. Markus Schnyder,
head of Mikron Tool, knows about
the problematic: “For many years our
customers suffered when drilling stainless
steel. The process was instable and slow;
thus, machining became extremely
expensive.“
Now, a new geometry provides a chip-
breaking effect at the front creating short
and curved chips. In the back an open
flute profile facilitates the evacuation of
microchips. For longer drills a polishing
of the flutes helps the easy evacuation of
chips from the bore.
Performance and process stability is
mainly given by the cooling of the tool:
two spiralized, internal coolant ducts
guarantee a constant and massive coolant
flow during the entire drilling process, an
important factor to prevent overheating
even with high cutting speeds.
The coolant ducts are in an area with little
stress and therefore the stability of the
tools is not jeopardized. Comparing to the
conventional round diameter, this means a
4-time higher coolant flow. The advantage is
the increased tool life of the drill because an
overheating of the cutting edges is avoided
right from the beginning.
Combined with the innovative tip
geometry, the cooling helps greatly to
break and flush out the chips from the
flutes. All these characteristics make
permit to work with higher cutting
parameters (speed, feed) and to drill in
one single stroke, reaching a high drilling
quality (cylindricity, diameter, alignment).
Mikron Tool SA Agno
Via Campagna 1
6982 Agno / Switzerland
Phone: +41 91 610 40 00
Fax: +41 91 610 40 10
www.mikrontool.com
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PECM Issue 40