This paper discusses the generation, influence and control methods of residual stress in the production of mechanical forgings in ship ports. Through the analysis of the causes of residual stress, the corresponding control measures are put forward to provide reference for improving forging quality and prolonging service life.
Due to the influence of heat treatment, deformation and other factors, residual stress will be generated in the forging of ship port machinery in the production process. These residual stresses have important effects on dimensional stability, fatigue strength and service life of forgings. Therefore, it is of great significance to study the residual stress during forging production to improve the quality and prolong the service life of forging.
Causes of residual stress
In the production process of mechanical forgings in ship ports, the residual stress is mainly generated from the following aspects:
Heat treatment: Forgings in the process of quenching, tempering and other heat treatment, due to temperature changes and phase changes, will lead to volume changes and internal stress.
Processing deformation: forging in the machining process, due to the cutting force, friction and other effects, will produce local plastic deformation, thereby forming residual stress inside the forging.
The influence of residual stress on mechanical forgings in ship ports is mainly manifested in the following aspects:
Dimensional stability: Residual stress may cause deformation of forgings during storage and use, affecting dimensional stability.
Fatigue strength: Residual stress may reduce the fatigue strength of the forging and shorten the service life.
Stress corrosion: In corrosive media, residual stress may accelerate the stress corrosion process of forgings and reduce their corrosion resistance.
In order to reduce the residual stress during the production of mechanical forgings in ship ports, the following control measures can be taken:
Optimize the heat treatment process: by adjusting the heat treatment process parameters, reduce the internal stress generated in the process of quenching and tempering.
Adopt reasonable processing method: select appropriate cutting parameters and processing methods to reduce plastic deformation during processing.
Stress relief treatment: stress relief annealing or vibration relief treatment for forgings to reduce residual stress.
The residual stress during the production of mechanical forgings in ship ports has an important effect on the quality and service life of the forgings. Through the analysis of the causes of residual stress, the corresponding control measures are put forward to provide reference for improving forging quality and prolonging service life. In the actual production process, the appropriate control method should be selected according to the specific situation to ensure the quality and reliability of the forging.
