A special design of roller bearing for steel rolling mills is being used to improve strip quality.
The design, based on two sealed-taper roller bearing units, can cope with the extra load forces on the high-speed heavy rollers which have been brought about by much tighter control of the strip production process.
Bearings supplier FAG solved this problem by adding a separately sealed two-row taper bearing outside the existing four-row taper bearing to handle increased radial and axial displacement loads on the rolls.
FAG founder Friedrich Fischer is credited with kickstarting the ball bearing industry with the machine he developed in 1883 to make steel balls of a consistent size and hardness.
Roller bearings company SKF has extended the operating life of its CE angular contact bearing unit sixfold using plastic material instead of steel for the bearing cage that keeps the ball bearings apart.
SKF’s cage design is made from a new grade of glass-fibre reinforced Peek that is lighter than steel and thermally more stable.
This improves bearing stability and smooth running, particularly during acceleration and deceleration.
Michell Bearings, known for supplying plain whitemetal-faced bearings for the shipbuilding and power generation industries, also refurbishes its own and other makes of bearings to a guaranteed ‘as new’ condition.
The company also provides design, installation, after sales and metallurgical services.
An extra-tough liner material called FrelonGold is being used in the bushings on the Pacific Simplicity range of self-lubricating bearings supplied by Hepco.
Compared with standard linear ball bushings, load capacity has been increased 20-fold and service life goes up by a factor of 270, the company says.
The bearings are suitable for underwater, abrasive, shock, vibratory, high and low-temperature applications.
HEPCO SLIDE SYSTEMS
Linear motion company Unimatic introduces ‘ultra-high load’ models to its Cross-Roller range to provide a dynamic load rating of 9,000N per roller on models with 24mm diameter rollers.
A version with 24mm diameter balls suits applications where track alignment is difficult. These are V-track linear bearings said to have a ‘zero-friction’ coefficient of 0.002/0.003 similar to ice on ice. They are available in standard rail lengths up to 200mm.
The LU and LE series miniature guides from NSK-RHP are available from stock as separate ball slides and rails so they can be tailored to specific requirements.
Developed originally for semiconductor fabrication, they now meet the demand for smaller dimensions in general automation applications, the company says.
The LU series has standard width rails of 9mm, 12mm and 15mm, in maximum lengths of 1,000mm for hardened steel or 670mm for stainless steel.
LE guides made from stainless steel have wider rails of 18mm, 24mm and 42mm in lengths to 1000mm.
Plastics housings make Greenlign roller bearings popular with food processors.
The range now includes the HPL series hanger bearings made from the same plastics material.
They come in metric and Imperial sizes for shafts from 12 40mm and 0.75in to 1.25in.
Supplier Heason boasts that plug-and-run features similar to those promoted by the computing industry are available with the Luge range of slides developed by Micro Slides for use with Etel linear motors (also available from Heason).
Features include AutoFlex technology which automatically adjusts bearing preload to overcome the effects of thermal expansion within the system.
Integral linear encoders provide 0.1 m positional feedback accuracy. Made from aluminium alloy to combine strength with maximum acceleration, slides are available for both ironless and iron core linear motors for travels between 300mm and 1500mm.