Application of vibration aging technology in disc valve body

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 an excitation force in the exciter output level, a certain frequency (speed) of any one of a range of frequencies with high frequency stabilization accuracy especially around the formant characteristics of load more severe cases, 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.