With the development of science and technology, the machine tool spindle speed is getting higher and higher, and the variable speed range is getting bigger and bigger, therefore, the requirement for high speed running stability of the bearings is also getting higher and higher. Bearing temperature rise is an important factor in limiting the speed of the bearing. In general, the correct choice of deep groove ball bearing type, tolerance level, configuration, clearance (preload) size, lubricant and lubrication, etc., can to a certain extent improve the high-speed performance of rolling bearings.

For general machine tools, the life of the spindle assembly is mainly refers to its use period to maintain the accuracy of the spindle, therefore, the requirements of the bearing accuracy to maintain performance to meet the requirements of the spindle assembly life. For heavy machine tools or powerful cutting machine tools, the bearing capacity of deep groove ball bearings should be considered first.

Bearings make precision parts, and thus require corresponding caution in use, both change the use of high-performance bearings, if used improperly, can not achieve the expected performance effect, so the use of bearings make should pay attention to the following matters.

(1) Dehydrogenation treatment. Bearings by different heat treatment process after treatment. After carbon and nitrogen infiltration, hydrogen embrittlement is serious and the bearing steel has a low shrinkage rate in the section. After dehydrogenation treatment, the performance of the workpiece is restored and the workpiece no longer has hydrogen embrittlement defects after re-quenching.

 (2) Bearing low-temperature tempering dehydrogenation. With the extension of tempering time, the section shrinkage rate rose, tempering 8h after the section shrinkage rate back to the original level; In addition, the hot-rolled state organization precipitation of hydrogen is slower, indicating that hydrogen embrittlement and the original organization.

(3) Natural ageing dehydrogenation. The hydrogen-containing workpiece is placed at room temperature, and the supersaturated hydrogen is gradually released and precipitated, and its hydrogen embrittlement hazard is reduced. From the two different process state workpiece, after 3 months and 6 months after the recovery of the section shrinkage, it can be seen that the normalised state recovery is faster, 3 months after the basic recovery; hot-rolled state 6 months after the recovery of the section shrinkage is obvious. The method shows that the effect of natural ageing to eliminate hydrogen embrittlement is significant.