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Application of vibration aging technology in disc valve body

Aging is the basic process for eliminating the residual stress of machined parts. The vibration aging originated in the United States in the 1970s and was widely used in Germany, the United Kingdom, and France. Since the early 1980s, China has introduced the use of vibration aging technology. Because vibration aging is an efficient, energy-saving, environmentally friendly and low-cost aging method, compared with traditional thermal aging and natural aging, vibration aging has a short production cycle, simple and flexible site, low production cost, no environmental pollution, etc. . Due to the incomparable superiority of vibration aging and adapting to the requirements of modern industry for energy and environmental protection, the application of vibration aging is the best choice for enterprises to improve traditional crafts to improve market competitiveness. At present, it has replaced traditional thermal aging in some aspects. Natural aging.
1. Vibration aging mechanism and principle of the device
1.1, vibration aging mechanism
In the process of blank manufacturing and cutting, the workpiece generates residual stress, which causes the workpiece to be unstable, reducing dimensional stability and mechanical physical properties. The vibration aging process eliminates residual stress in the metal workpiece by hammering. The workpiece resonates under the action of the external force of the period, and the alternating stress in the resonance is superimposed on the residual stress inside the workpiece. After a certain period of time, the material locally yields, causing the intragranular and grain boundary dislocation to slip, and the atom is from the unstable position. Move to a more stable position and low position. Through this process, the macroscopic residual stress of the workpiece is migrated, reduced and homogenized, thereby reducing or eliminating the internal residual stress of the workpiece.
1.2, the principle of vibration aging device
The mechanical vibration aging device mainly includes a vibration exciter, a control host, an acceleration sensor, a supporting rubber and the like. The main function is to control the vibration exciter at a certain excitation force output level, and work at a high frequency stability accuracy for any frequency in a certain frequency (rotation speed) range, especially when the load characteristics change before and after the resonance peak is severe. And record, identify and output relevant aging curves and parameters.
2, the process of vibration and aging of the disc valve box
The effect of vibration aging depends on the choice of process for vibration aging. It is a metallurgical butterfly valve body, which is a structural part cast from casting. Its shape is complex, its rigidity is relatively large, there are many convex and concave surfaces, the wall thickness is uneven, the residual stress is large and the distribution is complicated. There have been many shortcomings in the process of using natural aging. Since the company began to adopt the vibration aging process in 2005, it has made great progress in product quality and production efficiency. Years of production practice experience shows that: due to the complexity of the process of vibration aging, the process analysis of the box parts must be carried out before the vibration, and the vibration parameters should be optimized to improve the vibration aging effect.

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