This paper introduces the causes of residual deformation of locomotive bearing forgings and the correction methods. Based on the analysis of the causes of residual deformation, the corresponding correction measures are put forward, including thermal correction and cold correction. At the same time, the application of correction method is described in detail, aiming at providing reference for improving the quality and reliability of locomotive bearing forgings.
As the key parts of rolling stock, the accuracy and quality of locomotive bearing forging have an important impact on the running performance and safety of locomotive. However, in the manufacturing process of locomotive bearing forgings, due to the influence of process, material and other factors, the forgings often produce residual deformation, resulting in dimensional accuracy and shape tolerance beyond the specified range. Therefore, it is very important to correct the residual deformation of locomotive bearing forging.
The causes of residual deformation of locomotive bearing forging mainly include the following aspects:
Improper heat treatment process: In the heat treatment process, improper temperature control or uneven cooling speed, resulting in uneven internal organizational stress of the forging, resulting in residual deformation.
Unreasonable forging process: In the forging process, the uneven distribution of processing allowance or the forging ratio is too large, resulting in uneven metal flow inside the forging, resulting in residual stress.
Unstable material properties: uneven material composition or presence of impurities, resulting in uneven deformation of forgings in the manufacturing process.
In view of the causes of residual deformation of locomotive bearing forgings, the following correction methods can be adopted:
Thermal correction: By heating the forging to a certain temperature, the internal stress is eliminated, so that the forging can return to its original shape. Thermal correction is suitable for correcting forgings with large residual deformation.
Cold correction: the forgings are corrected at room temperature, and the forgings are restored to their original shape by applying external force or using special tools. Cold correction is suitable for correcting forgings with small residual deformation.
Taking a certain type of locomotive bearing forging as an example, the correction method of residual deformation is introduced. Large residual deformation occurred in the manufacturing process of the forging, resulting in excessive dimensional accuracy. In order to correct the residual deformation, thermal correction method was adopted. The specific steps are as follows: heat the forging to a certain temperature, hold it for a certain time, and then slowly cool it to room temperature. Through thermal correction, the residual deformation of forging is effectively eliminated and the dimensional accuracy is restored to normal.
The residual deformation of locomotive bearing forging is an important factor affecting the quality and reliability of forging. By analyzing the causes of residual deformation and taking corresponding corrective measures, the residual deformation of forgings can be effectively eliminated and the quality and reliability of forgings can be improved. In the actual production process, the appropriate correction method should be selected according to the specific situation to ensure that the quality of locomotive bearing forgings meet the requirements of use.
