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NSK - keeping it quiet
Super precision bearings equipped with next generation polymer cages have been developed by NSK to help improve the quality of machine tools. These include the TYN cage, which offers silent operation and 20 per cent lower temperature generation in angular contact bearings used in machining centres and grinding spindle applications; and the TB cage for double row cylindrical roller bearings.
Designed using FEM analysis, the TB cage claims similar or superior highspeed performance to brass cages, plus up to 40 per cent lower heat generation, and as much as ten times improvement in durability when operating under severe conditions.
NSK’s development of the TYN cage is the result of research that shows that silent operation is one of the key features for high-quality machine tools in order to improve their performance. The TYN cage is made of high-performance engineered polymer, and has a unique design that is said to overcome the problems of noise sometimes experienced with precision angular contact bearings using conventional phenolic cages and grease lubrication. The NSK TYN cage can eliminate this kind of noise: in particular, it gives greater benefit in machining centres or grinding spindle applications, which require silent operation as specified by builders of high quality machine tools.
The NSK TYN cage provides not only silent operation, but also up to 20 per cent lower heat generation and improvements in the reliability of the lubrication performance. These improvements are achieved by shortening of the running-in procedure, and by ensuring that grease is retained effectively within the bearing.
The TYN cage is available for use in both the Standard ACBB bearings and the ROBUST series of bearings, which are designed for use in high-speed spindles (e.g. up to 16,000 rpm on 70 mm spindle shaft diameter): this type is designed to contribute significantly to the higher accuracy of spindles.
It will be stocked as a universal combination (SU) with P3 accuracy (running accuracy: ISO class 2 and dimensional accuracy ISO class 4).