CN103710528B - Multiple resonance formula multi axis vibration ageing device and its implementation - Google Patents

Abstract

The invention relates to a multi-resonance multi-axis vibration aging device, which includes a vibrator, a vibrating block and a spring damping assembly. The vibrator is installed on the vibrating block, and the spring damping assembly is installed on both sides of the vibrator. The spring-damping assembly is connected with the vibration-exciting block, and the vibration-exciting block is connected with the multi-axis parallel workpiece. The realization method of the device is as follows: Different excitation frequencies generated by each exciter act on the excitation block together to generate multiple resonance frequencies much higher than the original excitation frequency of each exciter, and the excitation block then approaches the multi-axis The multiple resonance frequencies of the natural frequency of the parallel workpiece act on the parallel workpiece. When the natural frequency of the parallel workpiece and the excitation frequency of each exciter satisfy multiple linear combination relations, the parallel workpiece produces the main resonance and corresponding dynamic stress relief. Residual stress in each shaft. The invention can solve the problem that residual stress cannot be effectively eliminated because the excitation frequency of the current exciter is lower than the natural frequency of parallel workpieces, and the production efficiency is improved.

Description

Multi-resonance multi-axis vibration aging device and its realization method

technical field

The invention relates to a vibration aging device in the field of mechanical processing and a realization method thereof, in particular to a multi-resonance multi-axis vibration aging device and a realization method thereof.

Background technique

Vibration aging is an important method to eliminate the residual stress of the workpiece. Compared with natural failure and artificial thermal aging, vibration aging has the characteristics of no pollution, less investment, high efficiency, and saving space, time and energy. In the process of avoiding thermal aging There are also benefits in terms of possible oxidation of the workpiece, phase transitions and uneven heating of the workpiece leading to fission or new stresses during cooling. The vibration exciter of the current vibration aging device is limited by the motor speed and the maximum speed of the eccentric wheel mechanism, and its excitation frequency is less than 200Hz. Therefore, the vibration aging of high-rigidity workpieces has always been an insurmountable problem, and it has also become a constraint for the further promotion and use of vibration aging. the bottleneck. For shaft parts with a bending natural frequency less than 200Hz, the current vibration aging method can be used to eliminate residual stress, but for parts with a natural frequency greater than 100Hz, only one shaft can be processed at a time, and for shafts with a smaller natural frequency The number of parts that can be processed at one time is also limited, and the work efficiency is not high. In order to improve work efficiency, it is necessary to clamp multiple shafts (optical shafts or crankshafts) together and perform vibration aging treatment at the same time. However, since the bending stiffness of multiple shafts connected in parallel increases significantly, the overall bending natural frequency will increase. , far beyond the limit of 200Hz excitation frequency of the eccentric vibrator, using the current vibration aging method to excite multiple shaft parallel workpieces cannot produce resonance, and cannot effectively eliminate the residual stress of the workpiece.

For processing multiple shaft workpieces at the same time, the multiple resonance frequencies generated by the multiple resonance system are higher than the natural frequency of multiple shaft parallel workpieces, and then act on multiple shaft parallel workpieces to generate main resonance, resulting in corresponding The dynamic stress of each shaft can eliminate the residual stress. The multi-resonance vibration aging method can not only solve the problem of high-rigidity workpiece resonance, but also significantly improve work efficiency. The method can also be applied to other occasions of high-rigidity workpieces, and has strong applicability.

Contents of the invention

The purpose of the present invention is to provide a multi-resonance multi-axis vibration aging device and its realization method, so as to solve the problem that the existing vibration aging effect is applied to a high-rigidity workpiece composed of multiple shaft workpieces connected in parallel, and the excitation frequency encountered is much lower than the natural frequency of the system And the technical problem that can't make this parallel workpiece resonate.

The technical scheme that the present invention solves the above problems is as follows:

1. A multi-resonance multi-axis vibration aging device, including an exciter, an exciting block, an adjustable nonlinear spring and an adjustable damping, the exciter is installed on the exciting block, the adjustable nonlinear spring and the adjustable The damping consists of a spring-damping assembly, which is installed on both sides of the vibrator, the spring-damping assembly is connected with an exciting block, and the exciting block is connected with a multi-axis parallel workpiece.

2. The implementation method of the multi-resonance multi-axis vibration aging device, the different excitation frequencies generated by the various exciters act together on the excitation block and generate vibrations that are much higher than the original excitation frequencies of each exciter. Multiple resonance frequencies, the excitation block acts on the workpiece at multiple resonance frequencies close to the natural frequencies of the parallel workpieces of multiple shafts (optical axes or crankshafts), when the natural frequency of the parallel workpieces and the excitation frequency of each exciter Satisfying multiple linear combination relations, parallel workpieces generate main resonance and corresponding dynamic stress to eliminate the residual stress of each axis. The specific steps are:

(1) Determine the number of exciters according to the actual needs of the project,

(2) Through the finite element simulation and vibration test, the bending natural frequency of each order of the multi-axis parallel workpiece is obtained,

(3) Through the nonlinear vibration theory, the stiffness parameters of the adjustable nonlinear spring and the damping parameters of the adjustable damping are determined by the inversion method, so as to meet the conditions for multiple resonances in the multiple resonance system,

(4) Through harmonic response analysis, set the excitation frequency and excitation force of each exciter to generate sufficient dynamic stress,

(5) Start the exciters described above to make the multiple resonance system generate multiple resonance frequencies, and the excitation blocks in the multiple resonance system act on multiple shafts in parallel to produce main resonance and corresponding dynamic stress to eliminate each shaft the residual stress.

The outstanding advantages of the present invention are:

Although the multi-shaft parallel workpiece has high stiffness and high natural frequency, multiple resonances can also cause the high-stiffness parallel workpiece to generate main resonance under the action of multiple resonance excitation frequencies, which can overcome the excitation frequency of the current vibration aging exciter The defect is much smaller than the natural frequency of the high-rigidity workpiece, and the current vibration aging cannot effectively deal with the high-rigidity workpiece composed of multiple shafts connected in parallel at one time. The present invention can achieve a good vibration aging effect.

Description of drawings

Fig. 1 is a structural schematic diagram of the multi-resonance multi-axis vibration aging device described in the embodiment.

Fig. 2 is a schematic diagram of the crankshaft clamping method of the multi-resonance multi-axis vibration aging device described in the embodiment.

Fig. 3 is a diagram of the excitation mode of the multi-resonance multi-axis vibration aging device described in the embodiment.

Fig. 4 is a left side view of the multi-resonance multi-axis vibration aging device described in the embodiment.

Fig. 5 is a schematic diagram of the model of the multi-resonance multi-axis vibration aging device of the present invention.

detailed description

The technical solution of the present invention is further described by taking the triple resonance of 3 exciters and 10 crankshafts as an example.

Referring to Figures 1-5, a multi-resonance multi-axis vibration aging device includes a rigid base plate 1, a first support block 2, a first V-shaped pressure block 3, a first semicircular groove 4, a crankshaft 5, a frame 6, The first support rod 8, the first adjustable nonlinear spring 9, the first suspension rod 10, the first adjustable damper 11, the second suspension rod 13, the second adjustable nonlinear spring 14, the second adjustable damper 15, The second support rod 16, the vibration block 18, the first vibration exciter 7, the second vibration exciter 12, the third vibration exciter 17, the upper pressing plate 22, the lower pressing plate 23, the second supporting block 21, the second V-shaped Press block 19 and second semicircular groove 20.

The specific connection method is: the first vibrator 7, the second vibrator 12 and the third vibrator 17 are placed on the vibrating block 18 in the same direction and fixed by bolts respectively, and the vibrating block 18 and the upper plate 22 are fixed by bolts. Group connection, the upper half circle of the central main journal of the crankshaft 5 is in contact with the V-shaped groove of the upper pressure plate 22, the lower half circle of the central main journal of the crankshaft 5 is in contact with the V-shaped groove of the lower pressure plate 23, and the upper pressure plate 22 and the lower pressure plate 23 are connected by a bolt group And apply pre-tightening force; the lower semicircle of the crankshaft 5 major shaft end is supported by the first semicircle groove 4, the upper semicircle of the crankshaft 5 major shaft end is in contact with the first V-shaped pressing block 3, and the upper part of the first semicircular groove 4 is in contact with the first V-shaped The pressure block 3 is connected by a bolt group and a pretightening force is applied, the lower part of the first semicircular groove 4 is connected with the upper part of the first support block 2 by a pin group, and the lower part of the first support block 2 is fixedly connected with the rigid base plate 1; the crankshaft 5 is small The lower semicircle of the shaft end is supported by the second semicircle groove 20, the upper semicircle of the small shaft end of the crankshaft 5 is in contact with the second V-shaped compact 19, and the upper part of the second semicircular groove 20 is connected with the second V-shaped compact 19 by a bolt group and applied Pretightening force, the lower part of the second semicircular groove 20 is connected with the upper part of the second support block 21 by a pin group, and the lower part of the second support block 21 is fixedly connected with the rigid base plate 1; the frame 6 is fixed on the rigid base plate 1; the first One end of the assembly of the adjustable nonlinear spring 9 and the first adjustable damper 11 is connected with the first suspender 10 by a pin, and the other end is connected with the first support rod 8 by a pin, and the first suspender 10 is fixed on the frame 6 , the first support rod 8 is fixed on the excitation block 18; one end of the second adjustable nonlinear spring 14 and the second adjustable damper 15 assembly is connected with the second suspension rod 13 by a pin, and the other end is connected with the second support rod 16 are connected by pins, the second suspension rod 13 is fixed on the frame 6, and the second support rod 16 is fixed on the vibration excitation block 18; two spring damping assemblies are symmetrically distributed on both sides of the second vibration exciter 12.

The implementation method of the multi-resonance multi-axis vibration aging device is that the various exciters generate different excitation frequencies to act on the excitation block and generate multiple resonances that are much higher than the original excitation frequencies of each exciter Frequency, the excitation block acts on the workpiece with multiple resonance frequencies close to the natural frequency of the parallel workpieces of multiple shafts (optical axes or crankshafts). A linear combination relationship, parallel workpieces produce main resonance and corresponding dynamic stress to eliminate the residual stress of each axis, the specific steps are:

(1) Determine the number of exciters according to the actual needs of the project,

(2) Through the finite element simulation and vibration test, the bending natural frequency of each order of the multi-axis parallel workpiece is obtained,

(3) Through the nonlinear vibration theory, the stiffness parameters of the adjustable nonlinear spring and the damping parameters of the adjustable damping are determined by the inversion method, so as to meet the conditions for multiple resonances in the multiple resonance system,

(4) Through harmonic response analysis, set the excitation frequency and excitation force of each exciter to generate sufficient dynamic stress,

(5) Start the exciters described above to make the multiple resonance system generate multiple resonance frequencies, and the excitation blocks in the multiple resonance system act on multiple shafts in parallel to produce main resonance and corresponding dynamic stress to eliminate each shaft the residual stress.

The principle of the present invention is: before work, adjust the elastic parameters of the adjustable nonlinear spring and the damping parameters of the adjustable damping, the excitation frequencies of the first vibrator 7, the second vibrator 12 and the third vibrator 17 size and excitation force, in order to meet the condition of multiple shaft parallel workpieces to generate multiple resonances. When working, the first vibrator 7, the second vibrator 12 and the third vibrator 17 respectively use the excitation force F ₁ cos(ω ₁ t+α ₁ ), F ₂ cos(ω ₂ t+α ₂ ) and F ₃ cos(ω ₃ t+α ₃ ) act on the excitation block 18, and the excitation block 18 acts on the multi-axis Parallel workpieces produce multiple resonances, wherein F1 is the amplitude of the exciting force of the _first vibrator 7, F2 is the amplitude of the exciting force of the _second vibrator 12, and F3 is the amplitude of the exciting force of the _third vibrator 17. The amplitude of vibration force, ω ₁ is the vibration frequency of the first vibration exciter 7, ω ₂ is the vibration frequency of the second vibration exciter 12, ω ₃ is the vibration frequency of the 3rd vibration exciter 17, α ₁ is The phase angle of the first vibrator 7, α ₂ is the phase angle of the second vibrator 12, and α ₃ is the phase angle of the second vibrator 12.

Claims (1)

1. an implementation method for multiple resonance formula multi axis vibration ageing device, is filled by following multiple resonance formula multi axis vibration timeliness Putting and realize, described multiple resonance formula multi axis vibration ageing device includes vibrator, exciting block, adjustable nonlinear spring and can Resistance trimming Buddhist nun, vibrator is arranged on exciting block, and adjustable nonlinear spring and adjustable damping composition spring damping molectron, spring hinders Buddhist nun's molectron is arranged on vibrator both sides, and spring damping molectron is connected with exciting block, and exciting block is connected with multiaxis parallel connection workpiece；

It is characterized in that: described vibrator is no less than 3, each vibrator produce different excited frequencies and jointly act on Exciting block also produces the multiple resonance frequency far above the former excited frequency of each vibrator, and exciting block is again with in parallel close to many axle classes The multiple resonance frequency effect of inherent frequency of workpiece is on workpiece in parallel, when the natural frequency of workpiece in parallel and swashing of each vibrator Meeting multiple linear combination relation between vibration frequency, workpiece generation primary resonance in parallel and corresponding dynamic stress eliminate the remnants of every axle Stress, concretely comprises the following steps:

(1) quantity of vibrator is determined according to actual demands of engineering,

(2) by finite element simulation and vibration-testing, each rank natural bending frequency of many axle class parallel connection workpiece is obtained,

(3) by the theory of nonlinear oscillation, the method for inversion stiffness parameters of adjustable nonlinear spring and damping adjustable damping are determined Parameter, to realize meeting the condition of multiple resonance system generation multiple resonance,

(4) by harmonic responding analysis, set excited frequency and the exciting force size of described each vibrator, with produce enough dynamic should Power,

(5) start described each vibrator, make multiple resonance system produce multiple resonance frequency, the exciting block in multiple resonance system Remaking for many axle class parallel connection workpiece, generation primary resonance and corresponding dynamic stress eliminate the residual stress of every axle.