The JH spectrum harmonic aging equipment has a significant effect in removing the residual stress of the press body, and the spectrum aging technique multi-dimensional stress relief improves the dimensional accuracy of the workpiece. Spectral Harmonic Mode No matter the workpiece size, frequency stiffness, or material properties, harmonic peaks of five different modes can be found. The method is not limited by the speed range of the exciter, and has no special requirements for the excitation point and the pick-up point. It can handle the high rigidity and high natural frequency work that cannot be processed by the sub-resonance, and can satisfy the workpiece with high dimensional accuracy. Product applications cover a wide range.
1. Test plan
Two sets of presses of the same type that are welded are selected. Firstly, the residual stress distribution of the measuring points after welding is detected, and then the thermal stress and spectrum harmonic aging are respectively removed to remove the residual stress of the fuselage, and then two kinds of equipment are tested. The aging method eliminates and homogenizes the residual stress of the workpiece.
2. Test and test environment
Test workpiece: pressure machine body
Aging equipment: JH spectrum harmonic aging equipment
Testing equipment: magnetic stress testing equipment
3. Test process
Magnetic stress detection of the welded pressure machine body.
In the area where the residual stress is easily concentrated, the stress detection area is delineated, and the pre-aging magnetic stress is detected on the workpiece. After the aging, the magnetic stress detection is performed again along the original detection trajectory. The homogenization state of the stress distribution of the test piece was observed by comparing the magnetic stress before and after aging.
Spectrum aging for workpieces
The test piece is respectively subjected to 4 points of vibration damping and smooth support. The spectrum harmonic mode analysis is used to optimize the harmonic frequency of the five different modes of the workpiece for spectrum harmonic aging, and the other same type of body is subjected to thermal aging treatment.
4, analysis of experimental results
The pre-aging magnetic stress is detected on the test piece. After the aging, the magnetic stress is detected again along the original detection point trajectory. The magnetic stress is detected and compared before and after aging, and the homogenization state of the stress distribution of the test piece is observed. Observe the peak rate of stress gradient at each test point before and after aging.
Through the above analysis of results, you can see that
The distribution of magnetic stress before aging is uneven and there is a phenomenon of high peak stress. After aging, the peak stress is obviously decreased, and the distribution tends to be uniform.
The change of the gradient value before and after aging shows that the peak stress is effectively reduced, and the gradient value decreases by 43.7%. It also fully shows that the spectrum harmonic aging has a good effect on the elimination of residual stress inside the workpiece.
By comparing the harmonic aging of the spectrum with the gradient value of the workpiece after the thermal aging, it can be seen that the internal residual stress equalization effect of the workpiece after the spectral harmonic aging is higher than the thermal aging.
5. By comparing the results of the aging test before and after the aging, the spectrum harmonic aging and thermal aging have similar effects on the stress reduction rate, but the spectrum harmonic aging is obviously superior to the thermal aging in stabilizing the workpiece dimensional accuracy and improving the workpiece load resistance. After the spectrum harmonic aging, the magnetic stress distribution is uniformized, and the welding parts have a good effect of stress equalization and elimination.
It can be seen that the use of JH spectrum aging equipment to eliminate and homogenize the welding stress of the workpiece is an effective method.
Regarding the technical parameters and prices of JH vibration aging equipment, Nanjing Juhang Technology Co., Ltd. consulted.
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