CN110777252A - High Frequency Shock Vibration System for Relieving Residual Stress of Large Welded Structures - Google Patents

Abstract

High-frequency shock and vibration system for eliminating residual stress of large welded structural parts, including PC, signal generator, power driver, electromagnetic vibration exciter, high-frequency vibration amplitude amplifier, acceleration sensor, charge amplifier and oscilloscope; high-frequency The vibration amplitude amplification device includes an impact vibration transmission rod and an installation platform; the surface of the small cylindrical transmission rod is in contact with the welding joint area of the large structural part, and the large cylindrical transmission rod is connected with the installation platform; the signal generator outputs a sinusoidal excitation signal, and the signal The frequency of the shock vibration transmission rod is the axial resonance frequency of the shock vibration transmission rod, and the electromagnetic vibration exciter is input through the power driver to drive the electromagnetic vibration exciter to generate high-frequency vibration; the acceleration sensor is installed on the surface of the large cylindrical transmission rod, and the acceleration sensor and the electric charge The amplifier is connected, and the charge amplifier is connected to the oscilloscope. The invention has the advantage of eliminating the residual stress of large welded structural parts by means of high frequency impact vibration.

Description

High Frequency Shock Vibration System for Relieving Residual Stress of Large Welded Structures

technical field

The invention relates to the technical field of high-frequency vibration aging, in particular to a high-frequency impact vibration system for eliminating residual stress of large welded structural parts.

Background technique

Vibration aging technology has a series of advantages such as good treatment effect, fast and convenient, low energy consumption, short treatment time, and low environmental pollution. It has been widely used in various processes of mechanical processing and manufacturing, and has become a high-profile energy saving Type residual stress relief technology. The traditional low-frequency vibration aging technology uses a speed-adjustable motor as the excitation device, so that the excitation frequency is usually less than 200Hz, indicating that the optional mode shape of the traditional low-frequency vibration aging technology is very limited; The overall excitation method to eliminate residual stress has led to the very limited effect of traditional low-frequency vibration aging technology in eliminating local residual stress of structural parts or residual stress of large welded structural parts. The high-frequency vibration aging technology uses an electromagnetic vibration exciter as the excitation device, and its excitation frequency can reach 10 kHz, which expands the application range of the vibration aging technology. However, the output vibration energy of the electromagnetic vibration exciter is limited, so the structural parts use The high-frequency vibration aging treatment is carried out in the way of overall excitation, so that the high-frequency vibration aging technology is only suitable for eliminating the residual stress of small-sized structural parts.

At present, large-scale welded structural parts have been widely used in the field of mechanical engineering, and large welding residual stress is distributed in the welded joint area, and the welding residual stress belongs to tensile stress, which will reduce the mechanical properties of the welded joint, and also It will accelerate the stress corrosion cracking of structural parts, so how to eliminate the large tensile residual stress distributed in the welded joint area of large welded structural parts has become one of the key scientific issues in the research field of large welded structural parts. Aiming at the shortcomings of high-frequency vibration aging technology to eliminate welding residual stress of large-scale welded structural parts, the present invention proposes a high-frequency impact vibration system for eliminating residual stress of large-scale welded structural parts, that is, an electromagnetic vibration exciter and high-frequency vibration system are used. Based on the amplitude amplification device, a high-frequency shock and vibration system is built to eliminate the residual stress of large welded structural parts, and the high-frequency shock and vibration treatment is performed on the local area of the structural part, and the high-frequency vibration energy is directly applied to the local area of the material to promote the local area of the material. Plastic deformation occurs in the region to achieve the purpose of eliminating residual stress.

SUMMARY OF THE INVENTION

In order to solve the problem that the high-frequency vibration aging technology is difficult to eliminate the welding residual stress of large-scale welded structural parts, the present invention proposes a high-frequency impact vibration system for eliminating the residual stress of large-scale welded structural parts, that is, an electromagnetic vibration exciter and a high-frequency Based on the vibration amplitude amplifying device, a high-frequency shock and vibration system is built to eliminate the residual stress of large welded structural parts, which can perform high-frequency shock and vibration treatment on the local area of the structural parts, and directly act on the local area of the material by applying the high-frequency vibration energy to the local area. Plastic deformation occurs in the local area of the material to achieve the purpose of eliminating residual stress.

High-frequency shock and vibration system for eliminating residual stress of large welded structural parts, including PC, signal generator, power driver, electromagnetic vibration exciter, high-frequency vibration amplitude amplifier, acceleration sensor, charge amplifier and oscilloscope; high-frequency The vibration amplitude amplifying device includes an impact vibration transfer rod and a mounting platform fixed on the vibration table surface of the moving part of the electromagnetic vibration exciter; the impact vibration transfer rod is a stepped cylindrical transfer rod, including a small cylindrical transfer rod and a large cylindrical transfer rod. ; The maximum cross-sectional area of the shock and vibration transfer rod is smaller than the cross-sectional area of the installation platform; the length of the shock and vibration transfer rod is greater than the thickness of the installation platform; the surface of the small cylindrical transfer rod is in contact with the welding joint area of the large welded structure, and the large cylindrical transfer rod and Installation platform connection; PC includes signal generator drive module, oscilloscope drive module, shock vibration transmission rod axial resonance frequency determination module;

The PC control signal generator outputs a sinusoidal excitation signal whose amplitude and frequency can be independently and continuously adjusted, and inputs the electromagnetic exciter through the power driver to drive the electromagnetic exciter to generate high-frequency vibration; The frequency of the sinusoidal excitation signal is the axial resonance frequency of the shock vibration transmission rod;

The acceleration sensor is installed 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, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the PC.

Further, the described signal generator drive module is installed with the software for driving the signal generator, so as to realize the control of the signal generator by the PC; Data reading and display.

Further, the impact vibration transmission rod is integrally formed, and the impact vibration transmission rod and the installation platform are connected by threads; the installation platform is a cylinder.

Further, the electromagnetic vibration exciter is a high-frequency vibration exciter, which is used to generate high-frequency vibration with an excitation frequency greater than 1 kHz, and the highest excitation frequency can reach 10 kHz.

Further, the acceleration sensor is a piezoelectric acceleration sensor.

Further, the diameter d of the small cylindrical transmission rod is greater than the width L of the welded joint area. The welding joint area includes the welding seam area and the heat-affected area; the welding residual stress is mainly concentrated in the welding joint area; the diameter d of the small cylindrical transfer rod is greater than the width L of the welding joint area, which can be Make sure that the surface of the small cylindrical transfer rod covers the entire welded joint area, so as to effectively eliminate the tensile residual stress in the welded joint area. At present, the commonly used welding technologies mainly include laser welding, gas shielded welding, plasma arc welding and other technologies, and the width of the resulting welded joint area is usually less than 10 mm.

Further, the axial resonance frequency determination module of the shock vibration transmission rod adopts the method of sweep frequency test to determine the axial resonance frequency of the shock vibration transmission rod, that is, the amplitude of the sinusoidal excitation signal output by the PC control signal generator remains constant. , and then the PC controls the output frequency of the signal generator to change from low to high. At the same time, the PC records the waveform displayed by the oscilloscope corresponding to each frequency, and obtains the frequency with the largest waveform peak, which is the frequency of the shock and vibration transmission rod. Axial resonance frequency.

Specifically, it is composed of a PC, a signal generator, a power driver, an electromagnetic vibrator, a high-frequency vibration amplitude amplifier, an acceleration sensor, a charge amplifier and an oscilloscope, which is used to eliminate the residual stress of large welded structural parts. The system can directly inject high-frequency vibration energy into the local area of the surface of the structural member to be relieved of residual stress, and perform local high-frequency impact vibration on the structural member to eliminate residual stress. The acceleration sensor, charge amplifier, oscilloscope and PC constitute the unit for determining the axial resonance frequency of the shock vibration transfer rod, that is, the axial resonance frequency of the shock vibration transfer rod is obtained through the frequency sweep test, and at this frequency, the surface of the large welded structure is tested. High-frequency impact vibration treatment can increase the high-frequency vibration energy injected into the local area of the surface of large welded structural parts, thereby improving the effect of high-frequency impact vibration aging to eliminate welding residual stress of large welded structural parts.

The technical idea of the present invention is: a high-frequency vibration device for eliminating the residual stress of large welded structural parts is composed of a PC, 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. Frequency shock vibration system; the surface of the small cylindrical transfer rod is in contact with the welding joint area of the large welded structure; local high frequency shock vibration aging treatment is performed on the large welded structure at the axial resonance frequency of the shock vibration transfer rod.

The beneficial effects of the present invention are as follows:

1. The present invention proposes a high-frequency shock vibration system for eliminating the residual stress of large-scale welded structural parts, which can directly inject high-frequency vibration energy into local areas on the surface of large-scale welded structural parts, so as to eliminate the high-frequency vibration. The welding residual stress of large welded structural parts improves the application range of high-frequency vibration aging technology.

2. By performing high-frequency impact vibration aging treatment on the large welded structural parts at the axial resonance frequency of the impact vibration transmission rod, the vibration energy output by the electromagnetic exciter can be amplified, that is, the effect on the large welded structural parts can be improved. Vibration energy can significantly improve the effect of high frequency impact vibration aging to eliminate welding residual stress of large welded structural parts.

3. The high-frequency impact vibration system for eliminating the residual stress of large-scale welded structural parts proposed by the present invention can not only eliminate the welding residual stress of large-scale welded structural parts, but also can eliminate the residual stress of small-sized structural parts.

4. The high-frequency vibration amplitude amplifying device proposed by the present invention is composed of an installation platform and an impact vibration transmission rod, wherein the installation platform is fixed on the vibration excitation table surface of the moving part of the electromagnetic vibration exciter in the form of threaded connection, and the impact vibration transmission rod is connected to the vibration exciter. The mounting platform is connected by threads, and the shock and vibration transmission rod is integrally formed. During use, the shock and vibration transmission rod can be replaced according to actual needs. If it is replaced together with the mounting platform, it is easy to damage the threads on the moving parts of the electromagnetic exciter. Therefore, the high-frequency vibration amplitude amplification device proposed by the present invention can improve the service life of the entire high-frequency impact vibration device, and can also improve the application range of the high-frequency impact vibration device.

Description of drawings

Figure 1 Schematic diagram of a high-frequency shock and vibration system used to eliminate residual stress in large welded structures.

Figure 2 is a schematic diagram of a high-frequency vibration amplitude amplifying device.

Figure 3 Schematic diagram of the shock vibration transmission rod.

Fig. 4 Schematic diagram of welded joints of large welded structural parts.

Detailed ways

With reference to the accompanying drawings, the present invention is further described:

High-frequency shock and vibration system for eliminating residual stress of large welded structures, including PC, signal generator, power driver, electromagnetic vibration exciter, high-frequency vibration amplitude amplifier 3, acceleration sensor 2, charge amplifier and oscilloscope; The high-frequency vibration amplitude amplification device 3 includes an impact vibration transmission rod 31 and a mounting platform 32 fixed on the vibration table 5 of the electromagnetic vibration exciter moving part 4; the impact vibration transmission rod 31 is a stepped cylindrical transmission rod 31, including Small cylindrical transfer rod 31A, large cylindrical transfer rod 31B; the maximum cross-sectional area of the shock and vibration transfer rod 31 is smaller than the cross-sectional area of the installation platform 32; the length of the shock and vibration transfer rod 31 is greater than the thickness of the installation platform 32; the surface of the small cylindrical transfer rod 31A It is in contact with the welding joint area of the large welded structure 1, and the large cylindrical transmission rod 31B is connected to the installation platform 32; the PC includes a signal generator drive module, an oscilloscope drive module, and an impact vibration transmission rod axial resonance frequency determination module;

The PC control signal generator outputs a sinusoidal excitation signal whose amplitude and frequency can be independently and continuously adjusted, and inputs the electromagnetic exciter through the power driver to drive the electromagnetic exciter to generate high-frequency vibration; The frequency of the sinusoidal excitation signal is the axial resonance frequency of the shock vibration transmission rod 31;

The acceleration sensor is installed 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, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the PC.

Further, the described signal generator drive module is installed with the software for driving the signal generator, so as to realize the control of the signal generator by the PC; Data reading and display.

Further, the shock and vibration transmission rod 31 is integrally formed, and the shock and vibration transmission rod 31 is connected with the installation platform 32 through threads; the installation platform 32 is a cylinder.

Further, the electromagnetic vibration exciter is a high-frequency vibration exciter, which is used to generate high-frequency vibration with an excitation frequency greater than 1 kHz, and the highest excitation frequency can reach 10 kHz.

Further, the acceleration sensor 2 is a piezoelectric acceleration sensor.

Further, the diameter d of the small cylindrical transmission rod 31A is larger than the width L of the welded joint area. The welding joint area includes the welding seam area 6 and the heat-affected zone 7; the welding residual stress is mainly concentrated in the welding joint area; the diameter d of the small cylindrical transfer rod 31A is larger than the width of the welding joint area L, it can be ensured that the surface of the small cylindrical transmission rod 31A covers the entire welded joint area, thereby effectively eliminating the tensile residual stress in the welded joint area. At present, the commonly used welding technologies mainly include laser welding, gas shielded welding, plasma arc welding and other technologies, and the width of the resulting welded joint area is usually less than 10 mm.

Further, the described shock vibration transmission rod axial resonance frequency determination module adopts the method of sweep frequency test to determine the axial resonance frequency of the shock vibration transmission rod 31, that is, the amplitude of the sinusoidal excitation signal output by the PC control signal generator is maintained. Constant, and then the PC controls the output frequency of the signal generator to change from low to high. At the same time, the PC records the waveform displayed by the oscilloscope corresponding to each frequency, and obtains the frequency with the largest waveform peak, which is the shock and vibration transmission rod. The axial resonance frequency of 31.

Specifically, it consists of a PC, a signal generator, a power driver, an electromagnetic vibrator, a high-frequency vibration amplitude amplifier 3, an acceleration sensor 2, a charge amplifier and an oscilloscope to eliminate the residual stress of large welded structural parts. The shock vibration system can directly inject high-frequency vibration energy into the local area of the surface of the structural member 1 to be relieved of residual stress, and perform local high-frequency shock vibration on the structural member 1 to eliminate residual stress. The acceleration sensor 2, the charge amplifier, the oscilloscope and the PC constitute the unit for determining the axial resonance frequency of the shock vibration transmission rod 31, that is, the axial resonance frequency of the shock vibration transmission rod 31 is obtained through the frequency sweep test. The high-frequency impact vibration treatment on the surface of the large-scale welded structural component 1 can increase the high-frequency vibration energy injected into the local area of the surface of the large-scale welded structural component 1, thereby improving the effect of the high-frequency impact and vibration aging to eliminate the welding residual stress of the large-scale welded structural component 1.

The content described in the embodiments of the present specification is only an enumeration of the realization forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present invention also extends to those skilled in the art. Equivalent technical means that can be conceived by a person based on the inventive concept.

Claims (7)

1. A high-frequency shock vibration system for eliminating residual stress of large-scale welded structural parts, characterized in that it includes a PC, a signal generator, a power driver, an electromagnetic vibration exciter, a high-frequency vibration amplitude amplifier, an acceleration sensor, an electric charge Amplifier and oscilloscope; high-frequency vibration amplitude amplifying device includes impact vibration transmission rod, a mounting platform fixed on the vibration excitation table of electromagnetic vibration exciter moving parts; shock vibration transmission rod is a stepped cylindrical transmission rod, including small cylindrical transmission rod Rod, large cylindrical transfer rod; the maximum cross-sectional area of the shock and vibration transfer rod is smaller than the cross-sectional area of the installation platform; the length of the shock and vibration transfer rod is greater than the thickness of the installation platform; the surface of the small cylindrical transfer rod is in contact with the welding joint area of the large welded structure , the large cylindrical transmission rod is connected to the installation platform; the PC includes a signal generator drive module, an oscilloscope drive module, and an impact vibration transmission rod axial resonance frequency determination module; The PC control signal generator outputs a sinusoidal excitation signal whose amplitude and frequency can be independently and continuously adjusted, and inputs the electromagnetic exciter through the power driver to drive the electromagnetic exciter to generate high-frequency vibration; The frequency of the sinusoidal excitation signal is the axial resonance frequency of the shock vibration transmission rod; The acceleration sensor is installed 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, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the PC. 2. The high-frequency shock vibration system for eliminating the residual stress of large-scale welded structural parts as claimed in claim 1, characterized in that: the signal generator driving module is installed with the software for driving the signal generator, and the PC The control of the signal generator; the oscilloscope driving module is provided with software for driving the oscilloscope, so as to realize the control of the oscilloscope by the PC and the reading and display of data. 3. The high-frequency shock and vibration system for eliminating residual stress of large welded structural parts according to claim 1, wherein the shock and vibration transmission rod is integrally formed, and the shock and vibration transmission rod and the installation platform are integrally formed. The connection is made through threads; the installation platform is a cylinder. 4. The high-frequency impact vibration system for eliminating residual stress of large welded structural parts according to claim 1, wherein the electromagnetic vibration exciter is a high-frequency vibration exciter, which is used to generate an excitation frequency For high frequency vibration greater than 1kHz, the highest excitation frequency can reach 10kHz. 5 . The high-frequency shock vibration system for eliminating residual stress of large welded structures according to claim 1 , wherein the acceleration sensor is a piezoelectric acceleration sensor. 6 . 6 . The high-frequency shock vibration system for eliminating residual stress of large welded structural parts according to claim 1 , wherein the diameter d of the small cylindrical transmission rod is greater than the width L of the welded joint area. 7 . 7. The high frequency shock vibration system for eliminating residual stress of large welded structural parts as claimed in claim 1, wherein the shock vibration transmission rod axial resonance frequency determination module adopts the method of sweep frequency test to determine the shock The axial resonance frequency of the vibration transmission rod, that is, the amplitude of the sinusoidal excitation signal output by the PC control signal generator remains constant, and then the frequency output by the PC control signal generator changes from low to high, and the PC records the The waveform displayed by the oscilloscope corresponding to each frequency is obtained, and the frequency with the largest peak value of the waveform is obtained, which is the axial resonance frequency of the shock vibration transmission rod.

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