Technical description
Item no. 10205029, Revision 04
16 ( 44 )
5.5.3
Avoiding pressure peaks
Pressure peaks mainly occur when an incompressible medium (e.g. cooling lu-
bricant) collides at high speed with a closed or almost closed hole. This impact
may cause the pressure to increase to many times the permitted pressure.
Ü
Select the duty cycle of the valve so that the peaks in pressure that occur
not exceed the normally permitted operating pressure.
Closing valves may also cause excessive pressure (fluid hammer).
Excessive pressures may also occur when pressure is additionally applied to an
incompressible medium (e.g. cooling lubricant) in a closed space due to a
stroke motion.
Ü
Remedy: ventilation.
5.6
Leakage
Note: Damage to the HF spindle due to leakage.
Cooling lubricant may enter the HF spindle through the bearing of the inter-
nal coolant supply and destroy it:
q
If the internal coolant supply is operated in the lower pressure range.
q
If the pressure of the cooling medium builds up slowly.
u
Use leakage monitoring to protect the HF spindle from damage.
