Vibration aging method and device employing electric vibratory test system

Abstract

The invention relates to a vibration stress relief method using an electric vibration experimental system and a device thereof. The method comprises the following steps: residual stress in a workpiece is measured, and dynamic stress level applied during vibration stress relief for the workpiece is determined; frequency spectrum analysis for the workpiece is carried out by an electric vibration table to preferably choose a plurality of harmonic frequencies; the exciting force of sinusoidal fixed-frequency or frequency sweep is randomly applied on the workpiece, the dynamic stress level of the workpiece is detected in real time in the process of force application, and proper exciting force is chosen according to parameters adjusting the exciting force of vibration table; under proper exciting force, continuous ageing treatment for the workpiece is carried out till the operation is finished after reaching the set time. The device comprises the electric vibration table, a dynamic stress measuring system and a vibration controller. The invention has simple technique and low operation cost, and is suitable for workpieces with different sizes; the process is high-efficient and fast, and saves energy and protects environment; furthermore, the device has simple structure and convenient operation, small occupying space and low energy consumption, and is widely applied to the technical field of machining.

Description

technical field [0001] The invention relates to a vibration aging method and device in the technical field of machining, in particular to a vibration aging method and device using an electrodynamic vibration test system to eliminate residual stress in a metal workpiece. Background technique [0002] In the field of machinery manufacturing, after the metal workpiece is processed by casting, forging, welding, etc., residual stress is usually generated inside the metal workpiece. The existence of such residual stress will cause the dimensional change of the metal workpiece and reduce the stability of the dimensional accuracy of the workpiece. Therefore, , Eliminating the residual stress in the metal workpiece is a necessary process link. Commonly used methods to eliminate residual stress include natural aging technology, thermal aging technology and vibration aging technology. Among them, the natural aging technology has a long period and a large area, which is not suitable fo...

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Problems solved by technology

Among them, the natural aging technology has a long period and occupies a large area, which is not suitable for mass production; the thermal aging technology has high cost, large area, many auxiliary equipment, high energy consumption, easy to cause environmental pollution, and difficult to control the furnace temperature High, the workpiece is easy to oxidize, it is difficult to clean, and it is easy to crack due to uneven heating, thereby generating new stress during the cooling process; while the vibration aging technology has a significant effect in eliminating stress, less investment, short production cycle, and meets environmental protection requirements. to show the trend of replacing the first two aging techniques

[0003] At present, there are mainly two methods of vibration aging technology, namely, sub-resonance vibration aging technology and spectrum harmonic vibration aging technology. The speed of the vibrator motor is limited. When the resonant frequency of the workpiece exceeds the frequency range of the vibrator, the resonant frequency of the workpiece cannot be found by scanning, so the workpiece cannot be effectively vibrated, and the effective mode shape is less, and the stress of vibration aging is eliminated. Unstable, the elimination of stress can not get the best results; and the spectrum harmonic vibration aging technology is to find out the multiple harmonic frequencies of the workpiece through spectrum analysis of the workpiece, and five different harmonic frequencies are selected from these multiple harmonic frequencies. The harmonic frequency of the vibration mode is subjected to aging treatment. This method has certain difficulties in optimizing the harmonic frequency of the workpiece with dense harmonic frequency, and can only perform aging treatment on the optimized harmonic frequency points, but cannot At the same time, the harmonic frequency points are excited at the same time, so the fatigue life of the workpiece cannot be improved.

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