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What does the service life of Steel hot rolling mill machines products have to do with
In the operation and use of Steel hot rolling mill machines products, due to the higher working temperature of the mechanical equipment, the lower the load capacity value, the shorter the service life of the bearing, the relationship between the hardness of the bearing material and the service life of the bearing, the bearing The influence of the hardness of the working surface material on the bearing service life is mainly reflected in the reduction of the rated dynamic load value of the bearing. The hardness of the bearing component surface usually meets the standard. If the hardness of the bearing component surface is lower than the previous range, the nominal dynamic load numbers have a downward trend.
The relationship between service life in the operation of Steel hot rolling mill machines products, affected by the influence of non-metallic inclusions on the contact fatigue of the steel strip, oxide inclusions, and the material matrix under the metal surface layer on the outside, AC voltage Fatigue cracks are prone to occur under the action. The greater the number of non-metallic inclusions in the steel, the lower the fatigue life of the bearing. In order to reduce the non-metallic inclusions in the steel, an effective casting method must be used. Although the fatigue life of the bearing is improved, but The cost of steel is too high.
Therefore, for important bearing materials, vacuum removal or vacuum degassing and steel refining are usually used, the bearing life is sufficient to meet the user's performance requirements, the relationship between the residual tension on the surface of the bearing material and the service life of the bearing, in the Steel hot rolling mill During the heat treatment process, if the bearing parts are not handled properly, a large thermal stress will be generated. If the cooling process is insufficient or the rolling amount is too large, rolling will also occur. When the bearing and the shaft shell are matched, the tension is cut off and the interference is too large. ,
Internal stresses can also occur during the use of Steel hot rolling mill machines products, including destructive defects in the bearing working surfaces, which can also lead to changes in residual stress on the surface of the material, usually, caused by external factors on the surface of the material. These additional residual stresses are normal stresses, after normal cooling and heating.