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日期:
2013-09-23
Walter
wins Innovation Prize
At the start of this year's world-leading trade fair for metal
machining EMO in Hannover, Walter AG, together with the machine tool
manufacturer Starrag AG, have won the MM Award for Innovation for
the most innovative exhibit in the category "milling": The
production-scale machining of turbine blades with CO2-based
cryogenic cooling.
The outstanding feature of the approach developed by Walter and
Starrag is the liquid supply of CO2 coolant through machine,
spindle, toolholder and
tool, right to the
cutting edge – all without loss of pressure and therefore at room
temperature. Cooling to a maximum of minus 73 °C first occurs at the
nozzle, when the CO2, which has been in liquid form until that
point, expands. Therefore, users can machine up to 70 % faster in
comparison to dry machining. Conversely, the cryogenic CO2 cooling
doubles the tool life, as long as the cutting parameters are not
increased.
The developers at Walter and Starrag have, however, refined their
solution even further: A second media channel supplements the CO2
cooling. This channel can be used for aerosol or minimum quantity
lubrication (MQL), for example for milling high-strength alloys for
extremely heat-resistant turbine blades |
