Propose measures to control deformation, such as spin quenching, die quenching, and control the way parts enter the oil, to evaporate the potential of materials; on the other hand, improve the automation level and stability of heat treatment, fully ensure the stability of the optimized process, and realize the product The quality dispersion is very small (or zero) target, and special carbonitriding and quenching are carried out to increase the content of residual austenite on the surface, improve the surface stress state, and greatly improve the carbonitriding of the gearbox without reducing the appearance To increase the residual austenite content on the basis of hardness, grinding technology, line measurement technology, fault diagnosis technology, and deformation should be studied in combination with specific equipment and products.

   Greatly improve the wear life and accuracy of INA bearings. For example, the use of vapor deposition technology to coat the diamond coating on the INA bearing raceway can achieve the effect of reducing friction and wear resistance. It can be popularized and applied in household appliances INA bearings and computer hard disk drive INA bearings; using thermal coating technology to coat alumina ceramic materials on the outer cylinder of INA bearings can improve the electrical insulation performance of INA bearings, prevent electric shocks, and improve The life and reliability of the motor INA bearing; the tendency of the inner sleeve to crack is greatly reduced, and the edge stress concentration of the roller can be reduced. If the bearing inner sleeve is broken, it will be very troublesome. We buy the best quality bearing to use, and we also need to use the best inner sleeve. What if there is no best bearing inner sleeve, in case the inner sleeve is broken If it is cracked, and the bearing inside is damaged, it will only be crying, and it is useless to ask God.

   Therefore, the average life and reliability of INA bearings after austempering are significantly higher than those after conventional quenching. This process is widely used in railway INA bearings, rolling mill bearings and INA bearings used under special conditions. Compared with other life extension measures, this process is simpler and has lower interest. In recent years, the country has developed a new steel grade GCr18Mo bainite quenching special steel to promote the application of bainite quenching in large-size INA bearing parts.

   In view of the many advantages of this process, it is recommended to vigorously promote it in INA bearings that require harsh conditions (large impact load, poor lubrication, etc.) or require high reliability. The use of large-sized inclusions and carbides in INA bearings is increasing. The more diversified, the more stringent the requirements of INA bearings.

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   The speed of the INA bearing is mainly limited by the temperature rise caused by the frictional heating inside the INA bearing. When the speed exceeds a certain limit, the INA bearing will not continue to rotate due to burns. The limit speed of an INA bearing is the limit value for continuous rotation without generating friction and heating that can cause burns.

   The speed of the INA bearing is mainly limited by the temperature rise caused by the frictional heating inside the INA bearing. When the speed exceeds a certain limit, the INA bearing will not continue to rotate due to burns. The limit speed of an INA bearing is the limit value for continuous rotation without generating friction and heating that can cause burns.

   Therefore, the limit speed of the INA bearing depends on various factors such as the type, size and accuracy of the INA bearing, the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions. The limit speeds of various INA bearings using grease lubrication and oil lubrication (oil bath lubrication) are listed in each INA bearing size table. The value indicates that the standard design of the INA bearing is under general load conditions (C/P>=13, Fa/ Fr<=about 0.25) the limit value of the speed when rotating down. In addition, depending on its type and brand, lubricants may be superior to other properties but not suitable for high-speed rotation.

   The modified load condition of the limiting speed C/P<13 (that is, the equivalent dynamic load P exceeds about 8% of the basic rated dynamic load C), or when the axial load in the combined load exceeds 25% of the radial load, use The following formula corrects the limit speed.

   The quenched structure of INA bearing steel consists of quenched martensite, a small amount of undissolved secondary carbides and approximately 12% to 14% of retained austenite. Quenched martensite and retained austenite are unstable structures. The decomposition of martensite during tempering causes the volume of steel to shrink, while the decomposition of retained austenite causes the volume of steel to expand.

   With the increase of tempering temperature, the amount of transformation and decomposition of retained austenite will increase. Under the condition of ensuring the required hardness of the process, the tempering temperature should be appropriately increased to decompose the retained austenite and transform into martensite with a larger specific volume. The organization can increase the volume of the workpiece correspondingly, that is, increase the amount of outer diameter grinding. This method can save the parts of the INA bearing ring that become waste under normal grinding conditions.

   This method is more effective for thick and heavy workpieces (especially for spherical roller bearings) with large retained austenite content. In actual production, different tempering processes have been formulated for parts of different specifications, different sizes, and different thicknesses. Under the premise of ensuring hardness and deformation, the structure can be fully transformed, resulting in larger swelling, and the amount of grinding should be increased accordingly to save the waste.