NTN Develops Machine Tool Spindle Bearing With Air Cooling Pad

NTN Corporation (hereinafter referred to as NTN) has developed the "machine tool spindle bearing with air cooling pad" by applying its proprietary air cooling technology to machine tool spindle bearings to ensure high rigidity of the spindle while achieving the world's highest high-speed rotation performance standards.

Machine tool spindles require high rigidity and high-speed rotation for processing difficult-to-cut materials, molded products, complex shapes, medical equipment components and other parts. More specifically, in recent years, machine tools need to be able to process a wide variety of workpieces, 5-axis machining centers contain many machining functions in a single unit, or complex machining units have become mainstream, and so on, which has greatly increased the demand for high-speed rotation with higher rigidity.

The newly developed "machine tool spindle bearing with air cooling pad" focuses on using NTN's proprietary air cooling technology to reduce the heat generated on the spindle through the "air cooling pad", rather than adopting the more traditional method of modifying materials or heat treatment, changing internal design or improving lubrication surfaces. This limits the temperature difference between the inner and outer rings, improving high-speed rotation performance by 20% compared to conventional products (high-speed angular contact ball bearings) and achieving a dmn value of 2.1 million, achieving the highest standard of high-speed rotation performance with air-oil lubrication and fixed-position preload.

Conventional bearings with an inner diameter of φ70 and a speed of 23,000 min-1 (dmn value of 2.1 million) cannot apply preload internally, but the new product developed by NTN can apply preload of up to 1,300 N, and during assembly, the significant increase in spindle rigidity contributes to better machining functions over a wider speed range. By optimizing the internal design of the "air cooling gasket" to maintain the same performance level as the previous "environmentally friendly air oil lubricated angular contact ball bearing", the increase in noise generated when cooling the spindle is limited.

Sunrise bearing group could supplied all the NTN code for fast delivery,Below table is only a small part show.

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