Technical description
Item no. 10406166, Revision 03
15 ( 48 )
5.7.2
Filtering the cooling lubricant
Unfiltered flow media with a particle size in excess of 60 µm lead to increased
wear.
Ü
Use a filter upstream of the internal coolant supply that filters out particles
that are bigger than 60 μm from the medium.
The greater the number of particles in the flow medium, the greater the wear
on the internal coolant supply.
Ü
Ensure that the residual dirt load complies with the following specifica-
tions:
Ä
max. 100 mg/l
Ä
Aluminum machining: max. 50 mg/l.
Ü
Use media of the following classes:
Ä
Class 5 according to ISO 4406:1999 code 17/15/12
Ä
or class 8 according to NAS 1638
5.7.3
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.
