Residual stress elimination technology and effect evaluation of gravity cast alarm bracket
Publish Time: 2025-04-09
As an important security equipment component, the existence of residual stress in the gravity cast alarm bracket will have an adverse effect on its structural strength, stability and service life. Therefore, it is of great significance to study the residual stress elimination technology and effect evaluation of the gravity cast alarm bracket.During the gravity casting process, residual stress will be generated inside the alarm bracket due to the non-uniform cooling and solidification of the molten metal in the mold. These stresses may not only cause deformation and cracking of the casting, but also reduce its fatigue resistance and corrosion resistance. In order to eliminate these residual stresses, engineers have developed a variety of technical means.Among them, thermal aging treatment is a commonly used residual stress elimination method. By heating the alarm bracket to a certain temperature and keeping it for a period of time, the atoms inside the casting diffuse and rearrange, thereby releasing and eliminating residual stress. The effect of thermal aging treatment is significant, and it can significantly improve the dimensional stability and mechanical properties of the casting. However, this method also has some limitations, such as high energy consumption and long processing cycle.In addition to thermal aging treatment, vibration aging technology has also been gradually applied. Vibration aging uses an exciter to apply periodic vibration to the casting, causing the microstructure inside the casting to slip and rearrange, thereby eliminating residual stress. Vibration aging treatment has the advantages of high treatment efficiency, low cost, and no change in the surface quality of the casting. However, it should be noted that the parameter selection of vibration aging is crucial to the treatment effect and needs to be optimized according to the specific situation of the casting.When evaluating the effect of residual stress elimination technology, engineers usually use a variety of detection methods. Among them, X-ray diffraction is a commonly used non-destructive testing method that can accurately measure the distribution and size of residual stress inside the casting. By comparing the residual stress data before and after treatment, the effect of the elimination technology can be intuitively evaluated.For gravity casting alarm bracket, the choice of residual stress elimination technology should be comprehensively considered according to the specific situation. If the casting is large in size, complex in structure, and has high requirements for dimensional accuracy and mechanical properties, thermal aging treatment may be a better choice. For some small and simple castings, vibration aging technology may be more economical and efficient.In practical applications, engineers also need to pay attention to the process parameter control of residual stress elimination technology. For example, in thermal aging treatment, it is necessary to accurately control parameters such as heating temperature, holding time and cooling rate; in vibration aging treatment, it is necessary to reasonably select parameters such as vibration frequency, amplitude and treatment time. Only by ensuring the accurate control of process parameters can the effect of residual stress elimination technology be fully exerted.In summary, the residual stress elimination technology of gravity casting alarm bracket is of great significance to improving its structural strength, stability and service life. By selecting appropriate elimination technology and optimizing process parameters, the residual stress level inside the casting can be effectively reduced to meet the needs of practical applications. At the same time, the effect evaluation of residual stress elimination technology is also very important, which can help engineers better understand the treatment effect and optimize the treatment process.
