This paper introduces the cause, influence and elimination of residual stress in locomotive bearing forgings. By comparing the elimination methods of heat treatment, machining and vibration aging, it can provide reference for selecting the appropriate elimination methods in actual production. At the same time, this paper also describes the manufacturing process of locomotive bearing forgings in detail, so that readers can understand the whole manufacturing process.
As the key parts of railway rolling stock, the quality and service life of locomotive bearing forging are of great significance to the safety and stability of railway traffic. However, in the production process of locomotive bearing forgings, residual stress often occurs, which adversely affects the performance and service life of the forgings. Therefore, it is of great practical significance to study the residual stress of locomotive bearing forgings and its elimination methods.
Residual stress refers to the self-equilibrium stress existing in the body without external force. In the production process of locomotive bearing forgings, residual stress is mainly generated by heat treatment, mechanical processing and other processes. These processes can lead to changes in the internal organization of the forgings, which can create internal stresses.
The influence of residual stress on locomotive bearing forgings is mainly manifested in the following aspects: reducing fatigue strength of materials, causing deformation of workpieces, affecting dimensional accuracy and machining quality. Therefore, effective measures should be taken to eliminate residual stress during the production of locomotive bearing forgings.
Heat treatment method: Through heating and cooling, the internal organization of the forging changes, so as to achieve the purpose of eliminating residual stress. Common heat treatment methods are annealing, tempering and so on.
Machining method: By cutting, grinding and other machining methods, part of the metal on the surface layer is removed, so as to reduce the surface residual stress.
Vibration aging method: Through the way of vibration, the internal structure of the forging occurs microplastic deformation, so as to achieve the purpose of eliminating residual stress.
The manufacturing process of locomotive bearing forging mainly includes blanking, heat treatment, machining and other processes. Among them, heat treatment and machining are the main processes that produce residual stress, so special attention needs to be paid to the control and elimination of residual stress in these two processes.
The residual stress in locomotive bearing forging has an important effect on the performance and service life of the forging. Therefore, it is necessary to take effective measures to eliminate residual stress in the production process. By comparing the elimination methods of heat treatment, machining and vibration aging, it can provide reference for selecting suitable elimination methods in actual production. At the same time, understanding the manufacturing process of locomotive bearing forgings is also helpful to better understand the generation and elimination process of residual stress.
