1. In the process of producing bearings, some enterprises did not strictly follow the requirements of cleaning and rust prevention procedures and oil seal rust prevention packaging to carry out rust prevention treatment on the bearing parts in the processing process and the finished bearing products after assembly. For example, the turnover time of the ferrule in the turnover process is too long, and the outer circle of the outer ring contacts corrosive liquid or gas, etc.
2. The quality of antirust, cleaning kerosene and other products used by some enterprises in production cannot meet the requirements of process and technology regulations.
3. As the price of bearing steel has fallen again and again, the material of bearing steel has gradually declined. For example, the content of non-metallic impurities in steel is high (the increase of sulfur content in steel reduces the corrosion resistance of the material itself), and the metallographic structure deviation. At present, the bearing steel used by production enterprises comes from a variety of sources, and the steel quality is fish dragon mixed beads.
4. The environmental conditions of some enterprises are poor, the content of harmful substances in the air is high, and the turnover site is too small to carry out effective rust prevention treatment. Coupled with the hot weather, production workers violate rust prevention regulations and other phenomena also exist.
5. Bearing packaging materials such as antirust paper, nylon paper (bag) and plastic cylinder of some enterprises do not meet the requirements of antirust packaging of rolling bearing oil seal, which is also one of the factors causing corrosion.
6. The turning allowance and grinding allowance of bearing rings in some enterprises are too small, and the oxide skin and decarburization layer on the excircle cannot be completely removed is also one of the reasons.
