Origin and application abroad In the process of casting, welding, forging, machining, heat treatment, and straightening of the workpiece, residual stress occurs inside the workpiece, and the presence of residual stress inevitably leads to some undesirable results.
Such as: reduce the actual bearing capacity of the workpiece and crack;
Deformation easily affects the dimensional accuracy of the workpiece;
Accelerated stress corrosion;
Reduce the fatigue life of the workpiece.
Eliminate stress: natural aging, thermal aging, vibration aging, static overload aging, explosion aging, cyclic loading aging, etc., although all have shortcomings, but to a certain extent, to achieve the purpose of elimination and homogenization.
Vibration aging results from percussive aging. In welding, welds and the surrounding area are hammered with a small hammer immediately after welding for a period of time to prevent cracks. The reason is that the welding stress is eliminated at any time, so as to avoid eventual larger The stress concentration.
The percussion method has limited energy. Later it was found that when the workpiece was resonated, the maximum vibration capability of the workpiece could be achieved. In 1915, the world’s first patent on vibration residual stress was created in the United States. Until the late 1950s, with the improvement of the motor manufacturing level, light and delicate vibration aging equipment emerged successively in the United States, Germany, the United Kingdom, France, the Soviet Union and other countries, and were continuously applied to the machinery manufacturing industry. A large number of practical applications have proved this The method can improve the dimensional stability of the workpiece more than thermal aging.
Domestic development and status quo
The domestic development was relatively late. First, Sun Zhaoqing’s chief engineer and other older technical experts went abroad to investigate in 74 years, brought the technology back to China, and began to study transplantation in the Ministry of Machinery and Aviation, and put forward in the Ministry of Machinery during the “6th Five-Year†period. Tackling Key Issues—To improve the quality of machine tool casting products, identify “vibration aging feasibility studyâ€. In 1985, the Ministry of Machinery authorized 25,000 U.S. dollars in cooperation with U.S. Martin and introduced the world’s most advanced VSR-790 vibration aging equipment and related technologies.
In particular, the birth of JB/T5926-91 "Selection of process parameters for vibration aging and requirements for technical aging equipment" in 1991 made it possible to promote and develop the technology.
Jinan Jiugong is a manufacturer of professional aging machines. Please contact the company if necessary.
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