Production characteristics of rolling bearing parts

Compared with general mechanical parts, the bearing parts are short and thin rotating surface bodies. The rotating body determines that the processing machine is relatively simple, most of them are lathes and grinding machines; short and thin determines the axial rigidity, axial deformation can be Neglected, the radial stiffness is poor, and the tightening method during processing should have special considerations.

Although the rolling bearing parts have a simple structure but high technical requirements, they have the following processing characteristics:

Precision machining

Most of the surface of the bearing parts is ground. The grinding dimensions and geometrical accuracy are in μm. In particular, the raceways and rolling elements of the ferrule are more precise and require super finishing or grinding.

2. Multi-process processing

Bearing parts are required to be high and production processes are inevitable. General bearing production requires 20 to 40 processes, and more than 70.

3. Forming processing

The working surfaces of the bearing parts are all rotary forming surfaces, which are suitable for processing by molding. For example, the forging and rolling of the ferrule raceway are processed by forming tools or anti-profile plates.

In addition, most of the bearings are standardized products. The bearings of the same type require a large amount. In order to improve productivity, reduce costs, ensure quality, and widely adopt new technologies and improve mechanization and automation, bearing companies generally follow bearing models and varieties. For mass production, even special automated lines or lines can be built for production.

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Causes and prevention methods of eccentric bearing corrosion

    Corrosion of eccentric bearing is caused by various internal and external factors, which are summarized as follows: 1. Metal surface finish (oxygen concentration difference battery corrosion). 2. The chemical composition and structure of the metal material itself. 3. Composition and pH of the solution in contact with the metal surface; 4. Ambient temperature and humidity. 5. Various environmental media in contact with the metal surface. 6, other people's sweat is also the cause of bearing corrosion, its pH is 5 ~ 6. Therefore, in order to prevent rust caused by hand sweat, the installation and production personnel should wear gloves, do not touch the imported bearings by hand.

    Apply anti-rust oil to prevent rusting of eccentric bearing

   1. Immersion method: Some small imported bearings are immersed in anti-rust grease. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease. A method of adhering a layer of rust preventive grease to the surface.
    2, brushing method: pay attention to evenly spread on the surface of the imported bearing when brushing, do not produce accumulation, but also pay attention to prevent leakage coating.
    3. Spray method: Some large-scale anti-rust materials are not suitable for oiling by immersion method. Generally, the compressed air with a pressure of about 0.7Mpa is sprayed in the air cleaning place. The spray method is suitable for solvent-diluted rust preventive oil or thin layer rust preventive oil. This method must use sound fire protection and labor protection measures.

    Pretreatment method for rusting the surface of eccentric bearing:
    1. Surface cleaning: Cleaning must be combined with the nature of the imported bearing surface and the conditions at the time. Commonly used methods are solvent cleaning, mechanical cleaning, and chemical cleaning.
    2. Dry and clean the surface and dry it with filtered dry compressed air. Or use a drier to dry at a temperature of 120-170 ° C, and finally dry with a clean gauze.

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