Rotary valve couplings

Besides the possibility to make multiside machining also multiple clampings can be realized (depending on the workpiece). For that, due to clamping quality and effectiveness hydraulic elements should be applied.

For oil supply HYDROKOMP has developed a steady bearing which combines bearing, bearing clamping and rotary valve. Above that the rotary valve is equipped with a control function which allows clamping and releasing only in a defined position.  

Another advantage is the characteristic that the bearing clamping can be supplied with the same hydraulic pressure as the clamping elements. That way it is not required to reduce pressure at the hydraulic aggregate.

With this construction the space requirement for the clamping device can be maximized, the one for the steady bearing can be minimized and the costs for hydraulic and electrical controls can be optimized.

Cost pressure, time pressure, flexbility, quality standards, reduction in non-productive time, set-up time, all catchwords with which a production company is confronted in everyday operations and terms that formulate objectives. In this case a high number of items were to be machined annually, in production batches of 60 in one clamping.

The most useful clamping solution was a multible rotary clamping fixture, which permits both multilateral machining of the workpieces and multiple clamping. This solution was substantially determined by the use of the existing machine tools with a vertical spindle.

HYDROKOMP was commissioned as a manufacturer of hydraulic clamping elements to design this device. For this purpose a clamping concept was developed in advance, together with production planning.

A rotary valve coupling is installed in the counter bearing, so that only the upwardly facing side of the fixture can ever be clamped or unclamped.

Advantages of many types are offered by this design principle. Using normal rotary couplings, it would be necessary to employ a six-way rotary coupling. This requires more space and generates more kinetic torque as a result of the necessary seals.

There are additional costs because each connection plane must be fed by means of a hydraulic distribution valve including electrical control unit. This makes it possible to provide five sides of the fixture with constant pressure and to clamp and unclamp hydraulically only the sixth side facing upwards.

Nominal diameter:

5

Operating pressure:

pmax. 350 bar

Operating temp.:

from -10°C up to +60°C

Flow rate:

max. 133 cm³/s (8 l/min) in AT and BP

Stations:

6, 8 or 10

Triggering:

separetly or simultaneously

Oil connection:

G1/4 threaded port in the housing and rotary piston, radial
manifold with O-ring in the rotary piston, axial

Design:

for single-acting or double-acting clamping elements

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