Ceramic ball bearings in CNC machine tool spindle unit in the role of

Ceramic ball bearings in CNC machine tool spindle unit in the role of
 In recent years, foreign production of CNC machine tools or machining centers, many of which have adopted the spindle system ceramic bearings and motor spindle structure. Domestic research in this area is still in its infancy. A CNC machine tool spindle unit and ultra-fast cutting speed spindle bearings are high quality, efficient, characterized by advanced manufacturing technology, which can bring high-speed cutting mechanism, high-speed spindle unit, high acceleration and deceleration linear feed motor, control system and a series of high-performance related cell technology development. High-speed spindle unit is to achieve high-speed, high-quality processing of the most critical areas of technology, but also the most critical high-speed machine tool components. Most modern high-speed spindle uses a built-in integrated spindle motor spindle unit, the so-called spindle. Machine tool spindle speed spindle unit is an ideal structure. High-speed spindle unit is the core of high-speed precision bearings, its performance will directly affect the performance of the work spindle unit. As speeds increase, the bearing temperature, vibration and noise increases, reduced life. Therefore, improving the spindle speed on the premise that developed excellent performance high speed spindle bearings. At present, the high-speed spindle unit, spindle bearing mainly uses magnetic bearings, fluid hydrodynamic bearings,  ceramic ball  earings in three forms. Magnetic Bearings and high-speed performance, high precision, easy to implement diagnostics and online monitoring. However, practice shows that the bearing due to electromagnetic control system is too complex and has not yet been widely used. Liquid Hybrid Bearing combines hydrostatic bearing and hydrodynamic bearing advantages. But the bearings must be designed according to the specific machine specifically, separate production, low degree of standardization, maintenance is also difficult.
    Currently, the most widely used high-speed spindle bearings or hybrid  ceramic ball  bearings. Ie rolling or hot isostatic pressing using Si3N4  ceramic ball  , bearing rings remains rims. This bearing high degree of standardization, low price, small changes to the machine structure, easy maintenance, especially for high-speed operation occasion. Its K value has exceeded 2.7 × 106. To increase bearing life, increase the wear resistance of the raceway, the roller coating or other surface for treatment.