Aging is the basic process to eliminate the residual stress of machined parts. Vibrational aging originated in the United States in the 1970s and was later widely used in Germany, the United Kingdom, and France. Since the early 1980s, China introduced the use of vibration aging technology. Since 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 the advantages of short production cycle, simple and flexible site, low production cost, and no environmental pollution. . Due to the unparalleled 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 technologies and improve market competitiveness. At present, it has replaced traditional thermal aging and in some respects. Natural aging.
Vibration aging mechanism and device principle 1.1, vibration aging mechanism
Workpieces in the blank manufacturing and cutting process, the internal residual stress, resulting in the workpiece in an unstable state, reducing the dimensional stability and mechanical physical properties. The vibratory aging process eliminates residual stress in the metal workpiece by hammering. The workpiece undergoes resonance under periodic external forces. In the resonance, the alternating stress is superimposed on the internal residual stress of the workpiece. After a certain period of time, the material undergoes local yielding, leading to slippage in the grain and the grain boundary, and the atom is unstable in position. Move to the lower stable position energy. After this process, the macro residual stress of the workpiece is transferred, reduced and homogenized, thereby reducing or eliminating the internal residual stress of the workpiece.
1.2 Principle of vibration aging device
The mechanical vibration aging device mainly includes an exciter, a control host, an acceleration sensor, and a support rubber. The main function is to control the exciter's output level at a certain exciting force, and to work at any frequency with a higher frequency stabilization accuracy in a certain frequency (speed) range, especially when the load characteristics before and after the resonant peak change more severely. And record, identify and output relevant aging curves and parameters.
2. Vibration and aging process 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 made of cast structural parts. Its shape is complex, its rigidity is relatively large, its convex and concave surfaces are numerous, its wall thickness is uneven, its residual stress is large and its distribution is complicated. There are many shortcomings in the process of using natural aging. A company has made great progress in product quality and production efficiency since it started using vibration aging technology in 2005. Many years of practical experience in production show that: due to the complex process of vibration aging, it is necessary to perform the process analysis before the vibration of the box-type parts, and to optimize the vibration parameters to improve the effect of vibration aging.
Vibration aging mechanism and device principle 1.1, vibration aging mechanism
Workpieces in the blank manufacturing and cutting process, the internal residual stress, resulting in the workpiece in an unstable state, reducing the dimensional stability and mechanical physical properties. The vibratory aging process eliminates residual stress in the metal workpiece by hammering. The workpiece undergoes resonance under periodic external forces. In the resonance, the alternating stress is superimposed on the internal residual stress of the workpiece. After a certain period of time, the material undergoes local yielding, leading to slippage in the grain and the grain boundary, and the atom is unstable in position. Move to the lower stable position energy. After this process, the macro residual stress of the workpiece is transferred, reduced and homogenized, thereby reducing or eliminating the internal residual stress of the workpiece.
1.2 Principle of vibration aging device
The mechanical vibration aging device mainly includes an exciter, a control host, an acceleration sensor, and a support rubber. The main function is to control the exciter's output level at a certain exciting force, and to work at any frequency with a higher frequency stabilization accuracy in a certain frequency (speed) range, especially when the load characteristics before and after the resonant peak change more severely. And record, identify and output relevant aging curves and parameters.
2. Vibration and aging process 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 made of cast structural parts. Its shape is complex, its rigidity is relatively large, its convex and concave surfaces are numerous, its wall thickness is uneven, its residual stress is large and its distribution is complicated. There are many shortcomings in the process of using natural aging. A company has made great progress in product quality and production efficiency since it started using vibration aging technology in 2005. Many years of practical experience in production show that: due to the complex process of vibration aging, it is necessary to perform the process analysis before the vibration of the box-type parts, and to optimize the vibration parameters to improve the effect of vibration aging.
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