Inaccurate Maintenance of Machine Tool Spindle Bearing Failure

The bearing installation is normal and the lubrication is sufficient. The original suspicion that the lubricating oil did not enter the upper part of the spindle bearing of the machine tool was ruled out. However, all inner raceways have indentation or pressure pits or surface cracking-type fatigue exfoliation, rather than subsurface spalling-type failure, and this phenomenon does not occur when sufficient oil is supplied.

These foreign objects and the resulting indentation have damaged the integrity of the oil film, and have become experimentally verified as fatigue causing early failure of the spindle of the machine tool. The above judgment is correct.

Developed into a "seal and clean" type bearing, it has achieved great success. This kind of bearing is to add a special structure rubber seal on both sides of the original standard bearing. The feature is that this kind of seal ring is mainly used to prevent dirt from intruding into the bearing, and the main purpose is to maintain the grease. Different seals.

1, through the surface feel the quality of bearings I sold the Swedish bearing process found that many customers say that as long as the bearing surface is bright and good quality, which is wrong. The surface of the spindle of the machine tool spindle bearing should be a kind of black light, which is caused by whether the steel used in the bearing is up to the standard and its grinding process and the used cutting fluid. The former two are the main reasons.

2. Whether the chamfer is bright The chamfer of the spindle bearing does not determine the quality of the stainless steel bearing, but it reflects the processing method of the bearing. The chamfer is black, indicating that after quenching and other heat treatment, so increase the hardness of the bearing, and some people think that the chamfering is black does not look good is not processed, this is a misunderstanding.

3. The integrated cage is better than the two bodies. Although the new process uses an integral cage, it only saves material, and the performance on the rotation is worse than that of the two bodies.

In general, the service life of spindle bearings of a machine tool is related to three factors. One is the quality of the bearing itself. The second is the use of the environment. The third is the installation method.