CN110777251A - High-frequency impact vibration device for eliminating welding residual stress of large-scale structural member - Google Patents
High-frequency impact vibration device for eliminating welding residual stress of large-scale structural member Download PDFInfo
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- CN110777251A CN110777251A CN201911217432.7A CN201911217432A CN110777251A CN 110777251 A CN110777251 A CN 110777251A CN 201911217432 A CN201911217432 A CN 201911217432A CN 110777251 A CN110777251 A CN 110777251A
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Abstract
The high-frequency impact vibration device for eliminating the welding residual stress of the large structural part comprises a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor, a charge amplifier and an oscilloscope; the high-frequency vibration amplitude amplifying device comprises an impact vibration transmission rod and a mounting platform; the surface of the small cylindrical transmission rod is contacted with the welding joint area of the large structural member, and the large cylindrical transmission rod is connected with the mounting platform; the signal generator outputs a sine excitation signal, the frequency of the signal is the axial resonance frequency of the impact vibration transmission rod, and the sine excitation signal is input into the electromagnetic vibration exciter through the power driver to drive the electromagnetic vibration exciter to generate high-frequency vibration; the acceleration sensor is arranged on the surface of the large cylindrical transmission rod and is connected with the charge amplifier, and the charge amplifier is connected with the oscilloscope. The invention has the advantage that the welding residual stress of the large structural part can be eliminated in a high-frequency impact vibration mode.
Description
Technical Field
The invention relates to the technical field of high-frequency vibration aging, in particular to a high-frequency impact vibration device for eliminating welding residual stress of a large structural member.
Background
The vibratory stress relief technology has a series of advantages of good treatment effect, rapidness, convenience, low energy consumption, short treatment time, small environmental pollution and the like, is widely used in various machining and manufacturing processes at present, and becomes an energy-saving and environment-friendly residual stress relief technology which is spotlighted. The traditional low-frequency vibration aging technology adopts an adjustable-speed motor as excitation equipment, so that the excitation frequency of the traditional low-frequency vibration aging technology is usually less than 200Hz, which shows that the selectable vibration mode of the traditional low-frequency vibration aging technology is very limited; meanwhile, the traditional low-frequency vibration aging technology eliminates the residual stress in a mode of integrally exciting the structural member, so that the traditional low-frequency vibration aging technology has very limited effect in eliminating the local residual stress of the structural member or the residual stress of the large structural member. The high-frequency vibration aging technology adopts an electromagnetic vibration exciter as excitation equipment, the excitation frequency of the electromagnetic vibration exciter can reach 10kHz, the application range of the vibration aging technology is expanded, but the vibration energy output by the electromagnetic vibration exciter is limited, so that the high-frequency vibration aging treatment is carried out on structural members in an integral excitation mode, and the high-frequency vibration aging technology is only suitable for eliminating the residual stress of small-size structural members.
At present, large-scale welded structural members are widely applied in the field of mechanical engineering, large welding residual stress is distributed in a welding joint area, and belongs to tensile stress, so that the mechanical property of the welding joint can be reduced, and the stress corrosion cracking of the structural members can be accelerated, therefore, how to eliminate the large tensile residual stress distributed in the welding joint area of the large-scale welded structural members becomes one of the key scientific problems in the field of large-scale welded structural member research. Aiming at overcoming the defects of the welding residual stress of the large structural member by the high-frequency vibration aging technology, the invention provides the high-frequency impact vibration device for eliminating the welding residual stress of the large structural member, namely the high-frequency impact vibration device for eliminating the welding residual stress of the large structural member is built on the basis of an electromagnetic vibration exciter and a high-frequency vibration amplitude amplifying device, the high-frequency impact vibration treatment is carried out on the local area of the structural member, the high-frequency vibration energy is directly acted on the local area of the material, and the local area of the material is promoted to generate plastic deformation so as to achieve the purpose of eliminating the residual stress.
Disclosure of Invention
In order to solve the problem that the welding residual stress of a large structural member is difficult to eliminate by a high-frequency vibration aging technology, the invention provides a high-frequency impact vibration device for eliminating the welding residual stress of the large structural member, namely the high-frequency impact vibration device for eliminating the welding residual stress of the large structural member is built on the basis of an electromagnetic vibration exciter and a high-frequency vibration amplitude amplifying device, the high-frequency impact vibration treatment can be carried out on the local area of the structural member, the high-frequency vibration energy is directly acted on the local area of a material, and the local area of the material is promoted to generate plastic deformation so as to achieve the purpose of eliminating the.
The high-frequency impact vibration device for eliminating the welding residual stress of the large structural part comprises a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor, a charge amplifier and an oscilloscope; the high-frequency vibration amplitude amplifying device comprises an impact vibration transmission rod and a mounting platform fixed on a vibration exciting table surface of a moving part of the electromagnetic vibration exciter; the impact vibration transfer rod is a stepped cylindrical transfer rod and comprises a small cylindrical transfer rod and a large cylindrical transfer rod; the maximum cross-sectional area of the impact vibration transfer rod is smaller than that of the mounting platform; the length of the impact vibration transmission rod is greater than the thickness of the mounting platform; the surface of the small cylindrical transmission rod is contacted with the welding joint area of the large structural member, and the large cylindrical transmission rod is connected with the mounting platform;
the signal generator outputs a sine vibration excitation signal with independent and continuously adjustable amplitude and frequency, and the sine vibration excitation signal is input into the electromagnetic vibration exciter through the power driver to drive the electromagnetic vibration exciter to generate high-frequency vibration; the frequency of the sine excitation signal output by the signal generator is the axial resonance frequency of the impact vibration transmission rod;
the acceleration sensor is arranged on the surface of the large cylindrical transmission rod, the output end of the acceleration sensor is connected with the input end of the charge amplifier, and the output end of the charge amplifier is connected with the input end of the oscilloscope.
Furthermore, the impact vibration transmission rod is integrally formed and is connected with the mounting platform through threads; the mounting platform is a cylinder.
Furthermore, the electromagnetic vibration exciter is a high-frequency vibration exciter and is used for generating high-frequency vibration with the excitation frequency greater than 1kHz, and the highest excitation frequency of the electromagnetic vibration exciter can reach 10 kHz.
Furthermore, the acceleration sensor is a piezoelectric acceleration sensor.
Further, the diameter d of the small cylindrical transmission rod is larger than the width L of the welding joint area. The welding joint area comprises a welding seam area and a heat affected area; the welding residual stress is mainly concentrated in the welding joint area; the diameter d of the small cylindrical transmission rod is larger than the width L of the welding joint area, so that the surface of the small cylindrical transmission rod can cover the whole welding joint area, and the tensile residual stress of the welding joint area is effectively eliminated. The welding techniques currently in common use include laser welding, gas shielded welding, plasma arc welding, etc., and the resulting welded joint area is typically less than 10mm wide.
Further, the axial resonance frequency of the impact vibration transmission rod is obtained through a frequency sweep test, namely the amplitude output by the signal generator is kept constant, the frequency output by the signal generator is changed from low to high, and the frequency with the maximum waveform peak value displayed by the oscilloscope is obtained, wherein the frequency is the axial resonance frequency of the impact vibration transmission rod.
Specifically, the high-frequency impact vibration device for eliminating the welding residual stress of the large-scale structural part consists of a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor, a charge amplifier and an oscilloscope, and can directly inject high-frequency vibration energy into a local area of the surface of the structural part to be eliminated with the residual stress, and carry out local high-frequency impact vibration treatment on the structural part to eliminate the residual stress. The acceleration sensor, the charge amplifier and the oscilloscope form an axial resonance frequency determining unit of the impact vibration transmission rod, namely the axial resonance frequency of the impact vibration transmission rod is obtained through frequency sweep test, and the high-frequency impact vibration treatment is carried out on the surface of the large structural member under the frequency, so that the high-frequency vibration energy injected into the local area of the surface of the large structural member can be improved, and the effect of eliminating the welding residual stress of the large structural member by high-frequency impact vibration aging is improved.
The technical conception of the invention is as follows: the high-frequency impact vibration device for eliminating the welding residual stress of the large structural part consists of a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor, a charge amplifier and an oscilloscope; the surface of the small cylindrical transmission rod is contacted with the welding joint area of the large structural member; and carrying out local high-frequency impact vibration aging treatment on the large-scale welded structural part under the axial resonance frequency of the impact vibration transmission rod.
The invention has the following beneficial effects:
1. the invention provides a high-frequency impact vibration device for eliminating the welding residual stress of a large-scale structural member, which can directly inject high-frequency vibration energy into a local area on the surface of the large-scale welding structural member, realize elimination of the welding residual stress of the large-scale structural member in a high-frequency vibration mode and improve the application range of a high-frequency vibration aging technology.
2. The high-frequency impact vibration aging treatment is carried out on the large-scale welded structural part under the axial resonance frequency of the impact vibration transmission rod, so that the vibration energy output by the electromagnetic vibration exciter can be amplified, namely, the vibration energy acting on the large-scale structural part is improved, and the effect of eliminating the welding residual stress of the large-scale structural part by the high-frequency impact vibration aging treatment can be obviously improved.
3. The high-frequency impact vibration device for eliminating the welding residual stress of the large-sized structural member, provided by the invention, can eliminate the welding residual stress of the large-sized structural member and can also eliminate the residual stress of the small-sized structural member.
4. The high-frequency vibration amplitude amplifying device provided by the invention consists of a mounting platform and an impact vibration transmission rod, wherein the mounting platform is fixed on an excitation table top of a moving part of an electromagnetic vibration exciter in a threaded connection mode, the impact vibration transmission rod is connected with the mounting platform in a threaded connection mode, the impact vibration transmission rod is integrally formed, the impact vibration transmission rod can be replaced according to actual needs in the using process, and if the impact vibration transmission rod is replaced together with the mounting platform, a threaded hole in the moving part of the electromagnetic vibration exciter is easily damaged, so that the high-frequency vibration amplitude amplifying device provided by the invention can prolong the service life of the whole high-frequency impact vibration device, and can also improve the application range of the high-frequency impact vibration device.
Drawings
FIG. 1 is a schematic view of a high-frequency impact vibration device for eliminating residual welding stress of large structural members.
FIG. 2 is a schematic view of a dither amplitude amplifying apparatus.
Fig. 3 is a schematic view of an impact vibration transmission rod.
Fig. 4 is a schematic view of a large structural member weld joint.
Detailed Description
The invention is further illustrated with reference to the accompanying drawings:
the high-frequency impact vibration device for eliminating the welding residual stress of the large structural part comprises a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor 2, a charge amplifier and an oscilloscope; the high-frequency vibration amplitude amplifying device 3 comprises an impact vibration transmission rod 31 and a mounting platform 32 fixed on the excitation table surface 5 of the electromagnetic type exciter moving part 4; the impact vibration transfer rod 31 is a stepped cylindrical transfer rod 31 and comprises a small cylindrical transfer rod 31A and a large cylindrical transfer rod 31B; the maximum cross-sectional area of the impact vibration transfer rod 31 is smaller than the cross-sectional area of the mounting platform 32; the length of the impact vibration transmission rod 31 is greater than the thickness of the mounting platform 32; the surface of the small cylindrical transfer rod 31A is contacted with the welding joint area of the large structural member 1, and the large cylindrical transfer rod 31B is connected with the mounting platform 32;
the signal generator outputs a sine vibration excitation signal with independent and continuously adjustable amplitude and frequency, and the sine vibration excitation signal is input into the electromagnetic vibration exciter through the power driver to drive the electromagnetic vibration exciter to generate high-frequency vibration; the frequency of the sinusoidal excitation signal output by the signal generator is the axial resonance frequency of the impact vibration transmission rod 31;
the acceleration sensor is arranged on the surface of the large cylindrical transmission rod 31B, the output end of the acceleration sensor is connected with the input end of the charge amplifier, and the output end of the charge amplifier is connected with the input end of the oscilloscope.
Further, the impact vibration transmission rod 31 is integrally formed, and the impact vibration transmission rod 31 is connected with the mounting platform 32 through threads; the mounting platform 32 is a cylinder.
Furthermore, the electromagnetic vibration exciter is a high-frequency vibration exciter and is used for generating high-frequency vibration with the excitation frequency greater than 1kHz, and the highest excitation frequency of the electromagnetic vibration exciter can reach 10 kHz.
Further, the acceleration sensor 2 is a piezoelectric acceleration sensor.
Further, the diameter d of the small cylindrical transfer rod 31A is larger than the width L of the weld joint region. The welding joint area comprises a welding seam area 6 and a heat affected area 7; the welding residual stress is mainly concentrated in the welding joint area; the diameter d of the small cylindrical transmission rod 31A is larger than the width L of the welding joint area, so that the surface of the small cylindrical transmission rod 31A can cover the whole welding joint area, and the tensile residual stress of the welding joint area is effectively eliminated. The welding techniques currently in common use include laser welding, gas shielded welding, plasma arc welding, etc., and the resulting welded joint area is typically less than 10mm wide.
Further, the axial resonance frequency of the impact vibration transmission rod 31 is obtained through a sweep test, that is, the amplitude output by the signal generator is kept constant, the frequency output by the signal generator is changed from low to high, and the frequency with the largest waveform peak value displayed by the oscilloscope is obtained, and the frequency is the axial resonance frequency of the impact vibration transmission rod 31.
Specifically, the high-frequency impact vibration device for eliminating the welding residual stress of the large-scale structural part is composed of a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device 3, an acceleration sensor 2, a charge amplifier and an oscilloscope, and can directly inject high-frequency vibration energy into a local area of the surface of the structural part 1, where the residual stress is to be eliminated, and perform local high-frequency impact vibration treatment on the structural part 1 to eliminate the residual stress. The acceleration sensor 2, the charge amplifier and the oscilloscope form an axial resonance frequency determination unit of the impact vibration transmission rod 31, namely, the axial resonance frequency of the impact vibration transmission rod 31 is obtained through a frequency sweep test, and the surface of the large structural member 1 is subjected to high-frequency impact vibration treatment at the frequency, so that the high-frequency vibration energy injected into the local area of the surface of the large structural member 1 can be improved, and the effect of eliminating the welding residual stress of the large structural member 1 by high-frequency impact vibration aging is improved.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (6)
1. A high frequency shock vibration device for eliminating large-scale structure welding residual stress, its characterized in that: the device comprises a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifying device, an acceleration sensor, a charge amplifier and an oscilloscope; the high-frequency vibration amplitude amplifying device comprises an impact vibration transmission rod and a mounting platform fixed on a vibration exciting table surface of a moving part of the electromagnetic vibration exciter; the impact vibration transfer rod is a stepped cylindrical transfer rod and comprises a small cylindrical transfer rod and a large cylindrical transfer rod; the maximum cross-sectional area of the impact vibration transfer rod is smaller than that of the mounting platform; the length of the impact vibration transmission rod is greater than the thickness of the mounting platform; the surface of the small cylindrical transmission rod is contacted with the welding joint area of the large structural member, and the large cylindrical transmission rod is connected with the mounting platform;
the signal generator outputs a sine vibration excitation signal with independent and continuously adjustable amplitude and frequency, and the sine vibration excitation signal is input into the electromagnetic vibration exciter through the power driver to drive the electromagnetic vibration exciter to generate high-frequency vibration; the frequency of the sine excitation signal output by the signal generator is the axial resonance frequency of the impact vibration transmission rod;
the acceleration sensor is arranged on the surface of the large cylindrical transmission rod, the output end of the acceleration sensor is connected with the input end of the charge amplifier, and the output end of the charge amplifier is connected with the input end of the oscilloscope.
2. The high-frequency impact vibration device for eliminating the welding residual stress of the large structural member according to claim 1, wherein: the impact vibration transmission rod is integrally formed and is connected with the mounting platform through threads; the mounting platform is a cylinder.
3. The high-frequency impact vibration device for eliminating the welding residual stress of the large structural member according to claim 1, wherein: the electromagnetic vibration exciter is a high-frequency vibration exciter and is used for generating high-frequency vibration with the excitation frequency greater than 1kHz, and the highest excitation frequency can reach 10 kHz.
4. The high-frequency impact vibration device for eliminating the welding residual stress of the large structural member according to claim 1, wherein: the acceleration sensor is a piezoelectric acceleration sensor.
5. The high-frequency impact vibration device for eliminating the welding residual stress of the large structural member according to claim 1, wherein: the diameter d of the small cylindrical transmission rod is larger than the width L of the welding joint area.
6. The high-frequency impact vibration device for eliminating the welding residual stress of the large structural member according to claim 1, wherein: the axial resonance frequency of the impact vibration transmission rod is obtained through frequency sweep test, namely the amplitude output by the signal generator is kept constant, the frequency output by the signal generator is changed from low to high, the frequency with the maximum waveform peak value displayed by the oscilloscope is obtained, and the frequency is the axial resonance frequency of the impact vibration transmission rod.
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| CN201911217432.7A CN110777251A (en) | 2019-12-03 | 2019-12-03 | High-frequency impact vibration device for eliminating welding residual stress of large-scale structural member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559199A (en) * | 2022-03-07 | 2022-05-31 | 安徽理工大学 | Multidimensional vibration aging and vibration welding vibration exciter for large steel structural member |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559199A (en) * | 2022-03-07 | 2022-05-31 | 安徽理工大学 | Multidimensional vibration aging and vibration welding vibration exciter for large steel structural member |
| CN114559199B (en) * | 2022-03-07 | 2024-05-24 | 安徽理工大学 | Multidimensional vibration aging and vibration welding vibration exciter for large steel structural member |
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Application publication date: 20200211 |