Sandvik Coromant Quick Change for CNC Lathes - Manual (Page 27)

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High pressure coolant (HPC)
Most machines now offer a HPC capability around
70 bars. The benefits are great for both turning and
drilling operations and offer quick payback due to
increased machine utilization and increased metal
cutting efficiency. Chip ‘bird nests’ around tools and
‘bailing’ in the conveyor account for a high percentage
of all machine stoppages.
The system requirements to consider are:-
• Filter – 20 microns.
• Pressure – the pressure requirement to break
the chip varies depending upon the material and
the cutting parameters but 70 bars is adequate
for most applications.
• Flow – the flow required is driven by the number
and diameter of coolant outlets.
• Turning - Using CoroTurn HP the flow requirement
of 20 litres/min.
• Drilling - with internal through coolant
Through coolant helps with chip evacuation pre
venting chip jamming in the flute. The coolant hole
diameters increase with the drill diameter mean
ing that a higher flow rate is needed for larger
diameter drills. A variable pressure pump is
recommended.