Strip steel coils are the precursor of many steel products before their final shaping process. These include high strength constructional steels, tin cans and stamped parts for vehicles. Even the plastic housings of electronic products such as PCs and telephones contain a core made of steel.
To produce a coil, a hot rolled steel strip is clamped and the core is rotated by hydraulically operated mandrels. These utilise rotating unions in the centre to pass hydraulic oil with a pressure of 130 bar from the stationary supply lines to the rotating cylinder within the mandrel. A typical steel coil may be 2 metres wide, 2 metres diameter and weigh 36 tons. It requires heavy machinery to coil a steel strip in 2 to 5 minutes. The machinery must also be able to handle heavy weights and continuously applied heavy pressure, as well as the pressure spikes that occur during each clamping and unclamping cycle.
In older rotating unions there was a risk that the oil used for lubricating the sealing surface of the rotating union would press out, causing the sealing surfaces to run dry and rub against each other. This resulted in high wear, leakage and unplanned machine stops.
Deublin‘s new-generation, hydrostatically sealed rotating unions for high pressure hydraulic systems are ideal for any steel processor where hot roll strip is coiled, unwound or recoiled. They ensure continuous lubrication of the sealing surfaces by means of a controlled bypass flow with targeted media filtration. This results in a high level of functionality and a long service life.
Among the many other advantages of these high quality rotating unions are optional one to four media passages; rotors made of hardened steel; wear resistant bearing bushings with shaft seals for leakage chamber sealing; and leakage connection for the pressure dependent defined leakage.
Coil manufacturers installing Deublin rotating unions in their high pressure hydraulic systems benefit from reduced downtime; in addition the long service life allows them to fit in with planned routine maintenance, with performance and cost benefits for plant managers and controllers.
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