Schaeffler has designed, manufactured and delivered four large spherical roller bearings for use in the world’s largest roller mill, which will operate in a copper mine in Arizona, US.
The precision bearing producer delivered the double-row spherical roller bearings (designated 241/1250-B-K30-MB-C3) to Metso Minerals, the manufacturer of the roller mill, in 2011. Each bearing has a bore diameter of 1,250mm, an outside diameter of 1,950mm and a width of 710mm.
The new roller mill, which covers a floor area of 60m², is designed to deliver an output of 10,000 tonnes per hour of crushed copper ore. Extremely large, heavy rollers are therefore required to cope with such large volumes.
To suit the steel rollers, Schaeffler’s application engineers had to select spherical roller bearings of corresponding dimensions, with outside diameters of almost 2m.
Key information
*The chosen double-row spherical roller bearings are extremely durable with solid brass cages guided on the inner ring and an optimised internal design.
*They have a very high load-carrying capacity (basic dynamic load rating is 37,500kN) and the bore is tapered with a ratio of 1:30.
*The size of the spherical roller bearings created special challenges for Schaeffler’s production plant in Wuppertal, Germany; for example, in order to assemble and *position the 50kg rollers into the bearings, a special lifting device had to be designed and built.
*Metso Minerals is also considering condition monitoring and a grease sensor for the application, as well as mounting and engineering support services.
*Schaeffler has additionally supplied its ELGES spherical plain bearings and INA plain bearings for the roller mill’s hydraulic cylinders.
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