CN108956782A - A kind of laser-impact online test method and device based on frequency of sound wave characteristic - Google Patents
A kind of laser-impact online test method and device based on frequency of sound wave characteristic Download PDFInfo
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- CN108956782A CN108956782A CN201810323834.4A CN201810323834A CN108956782A CN 108956782 A CN108956782 A CN 108956782A CN 201810323834 A CN201810323834 A CN 201810323834A CN 108956782 A CN108956782 A CN 108956782A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to laser processing technology and field of non destructive testing, refer in particular to a kind of laser-impact online test method and device based on frequency of sound wave characteristic.The device is made of sample circuit, laser-impact frequency of sound wave signal library, system program, and wherein sample circuit includes: sound collecting device, low-pass filter, common collector amplifying circuit, A/D converter.System program is made of three sub- programs: time-frequency convert subprogram, signal processing subprogram and control subprogram.It by the actual measurement frequency of sound wave signal during detection laser-impact, is compared with the frequency of sound wave signal in signal library, realizes the on-line checking of laser-impact effect.
Description
Technical field
The present invention relates to laser processing technology and field of non destructive testing, refer in particular to a kind of laser based on frequency of sound wave characteristic
Online test method and device are impacted, suitable for the laser-impact technique to improve key components and parts mechanical performance.
Background technique
The principle of laser impact technology is the short pulse when high power density by flowing water (restraint layer), acts on metal watch
When the absorbed layer in face, absorbed layer gasifies rapidly, simultaneously forms plasma gas.Plasma gas sharply expands, in metal
Surface introduces residual compressive stress.Laser-impact is a kind of antifatigue, wear-resistant and resistance to corrosion that metal material can be improved
New and high technology.Furthermore laser-impact can also utilize the high-amplitude shock wave that high energy pulse laser and material interaction induce
Stress effect makes plate generate plastic deformation.
In the laboratory stage of early stage, the workpiece just through impact can be taken off, detect the effect of impact.But in work
The industry stage, since laser-impact is completed in closed workplace, so on-site test is impossible after every Secondary Shocks
, in addition consider the raising of production efficiency, this detection mode is no longer applicable in.Laser impact technology is generalized to work
In industry application, the on-line checking of process, the effect of real-time detection impact must be just realized, and process matter as control
The foundation of amount.
Existing laser-impact online test method mainly has: (1) the laser impact intensified system of flight time monitoring
(Laser Shock Peening System With Time-of-flight Monitoring；Patent Number:
US20070119824A1).This detection method (is impacted using the flight time feature of shock wave during laser-impact
The spread speed of wave), impact results are predicted, the real-time online detection of laser-impact is realized.(2) it is based on shock wave wave
The laser impact intensified online test method and device (Authorization Notice No. CN 101482542B) of shape feature, which passes through inspection
The amplitude and pulse width of the shock wave propagated in air are surveyed, realizes the on-line checking of laser-impact effect.
Above several method cannot be accurately judged to the failure type during laser shocking processing, comprising: (1) swash
Light device goes out failure caused by photo-labile；(2) absorbed layer breaks through caused failure by plasma；(3) caused by workpiece ablation
Failure；(4) flowing water (restraint layer) is not covered with failure caused by workpiece.And the above several method cannot be when failing generation
Laser-impact equipment downtime is automatically controlled, realizes automated job.
Due to cannot accurately detect the specific failure cause during laser-impact, laser-impact technique is joined at this stage
Several optimization has had reached a bottleneck period.The processing in online test method real-time detection process for needing one kind new
Quality, and its type is accurately pointed out when failing and occurring, constructive foundation is provided for the improvement of laser-impact technological parameter.
Summary of the invention
In view of the above-mentioned problems, that the object of the present invention is to provide a kind of detection accuracy is high, improve detection efficiency based on sound
The laser-impact online test method of wave frequency rate characteristic.Pass through the actual measurement frequency of sound wave signal during detection laser-impact,
It is compared with the frequency of sound wave signal in signal library, realizes the on-line checking of laser-impact effect.The invention patent simultaneously
Provide a kind of device of laser-impact on-line checking based on frequency of sound wave characteristic, including sound collecting device, low-pass filter,
Common collector amplifying circuit, A/D converter, laser-impact frequency of sound wave signal library, system program.This method and device can be quasi-
It really detects the failure cause during laser-impact, provides constructive foundation for the improvement of laser-impact technological parameter.
The purpose of the present invention is realized by the following technical means:
The principle of the present invention is: when certain workpiece of laser-impact, the frequency of sound wave caused by shock wave be it is determining, when
When failing, the frequency of sound wave caused by respective impact wave can change, and the variation by detecting frequency of sound wave can be sentenced
The failure cause of disconnected laser-impact out detects to carry out online high-precision to the processing quality of laser-impact.
A kind of laser-impact on-line measuring device based on frequency of sound wave characteristic includes: laser-impact frequency of sound wave signal
Library, system program, sample circuit.The sample circuit of described device includes: sound collecting device, low-pass filter, and common collector is put
Big circuit, A/D converter.Sound collecting device, low-pass filter, common collector amplifying circuit, A/D converter by signal wire according to
Secondary connection, last A/D converter are connected on computer.Computer is connect by signal wire with control cabinet, and control cabinet passes through letter
Number line is connect with manipulator and laser respectively.Sound collecting device is located above the workpiece of clamping machinery on hand, and distance should make to flow
Water constraint layer obtains optimal information of acoustic wave under the premise of not sputtering at bionic ear sound collecting device；Laser-impact sound wave frequency
Rate signal library and system program installation are on computers.By detection laser-impact during actual measurement frequency of sound wave signal, with
Frequency of sound wave signal in signal library compares, and realizes the on-line checking of laser-impact effect.
The sound collecting device is used to collect the time-domain signal of sound wave using bionic ear sound collecting device.
The low-pass filter use Butterworth filter, for filtering out white noise, when set its cutoff frequency as
When 1000Hz, noise can be reduced to one thousandth, if noise density is identical, the higher shadow to overall noise voltage of frequency
Sound is bigger, so overall noise voltage can significantly be reduced by removing high-frequency noise.
The common collector amplifying circuit plays the role of amplifying electric current and power, the A/D converter can be by simulated sounds
Wave signal is converted to digital sound wave signal.
There are three subprogram, each functions are as follows: a time-frequency convert subprogram: utilize discrete fourier transform for the system program
Fast algorithm implementation time-frequency convert function；B signal processing subprogram: by analyzing frequency-region signal, judge the effect of laser-impact
Fruit exports judging result；C controls subprogram: since control cabinet is connected with laser and manipulator, system program passes through control control
Cabinet processed can be shut down according to judging result automatic control manipulator and laser.
The system program will survey the amplitude and signal of each frequency of frequency of sound wave signal by signal processing subprogram
The amplitude of each frequency of standing acoustic waves frequency signal in library compares, if the amplitude of certain band frequency is above standard, frequency of sound wave is believed
The threshold k % of number frequency range, then the actual measurement frequency of sound wave signal is judged to failing by the signal processing subprogram in system program
Signal, on the contrary then be normal signal, processing is normally carried out.The system program will be judged to failure actual measurement frequency of sound wave signal with
Failure frequency of sound wave signal in signal library compares, and corresponds to if all frequency ranges are all less than in certain failure frequency of sound wave signal
The threshold k % of frequency range amplitude, then the programmed decision failure mode, exports failure cause, the system program, which issues instruction, to be made
It obtains laser and manipulator is shut down.Conversely, program output unknown cause failure, the system program issue instruction so that laser
It is shut down with manipulator.
The calculation formula of the threshold k are as follows: K=B × S.Wherein, B indicates the corresponding frequency of sound wave signal packet in signal library
The amplitude of winding thread.Since the corresponding frequency of sound wave signal in signal library is different, therefore the amplitude of its envelope is also different, therefore
Each equal non-correlation of threshold k %.S indicates safety coefficient, and value is empirical value, and can be adjusted according to actual processing environment
Section.
The laser-impact frequency of sound wave signal library includes: that a laser goes out failure frequency of sound wave letter caused by photo-labile
Number；Failure frequency of sound wave signal caused by b absorbed layer is broken through by plasma；Failure frequency of sound wave letter caused by the ablation of c workpiece
Number；D flowing water restraint layer is not covered with failure frequency of sound wave signal caused by workpiece；The laser-impact standing acoustic waves that e does not fail
Frequency signal.
Gain effect of the invention:
1. testing principle of the present invention is simple, the detection device used is simple, and detection process is stable, repeatability is high, is easy to
It realizes.2. frequency domain analysis is applied to laser-impact detection field for the first time by the present invention, online compared to traditional laser-impact
Detection method and device, the present invention can accurately detect the failure cause during laser-impact, join for laser-impact technique
Several improvement provides constructive foundation.3. the safety coefficient S that the present invention is set, value can be adjusted according to actual processing environment
Section.Therefore adaptability of the invention is wider.
Detailed description of the invention
Fig. 1 is a kind of flow chart of laser-impact online test method based on frequency of sound wave characteristic.
Fig. 2 is a kind of schematic diagram of laser-impact on-line measuring device based on frequency of sound wave characteristic.
Wherein, 1 is bionic ear sound collecting device, and 2 be Butterworth filter, and 3 be common collector amplifying circuit, and 4 be A/D
Converter, 5 be sample circuit, and 6 be computer, and 7 be control cabinet, and 8 be laser, and 9 be manipulator, and 10 be workpiece, and 11 be absorption
Layer, 12 be flowing water (restraint layer).
Specific embodiment
The invention will be further described with reference to the accompanying drawing, but protection scope of the present invention is not limited to that.
As shown, the present invention includes laser-impact frequency of sound wave signal library, system program, sample circuit 5 etc..Pass through inspection
The actual measurement frequency of sound wave signal of sound wave, compares with the frequency of sound wave signal in signal library during survey laser-impact, realizes
The on-line checking of laser-impact effect.The sample circuit 5 of device includes: bionic ear sound collecting device 1, Butterworth filter 2,
Common collector amplifying circuit 3, A/D converter 4.Laser-impact frequency of sound wave signal library and system program are mounted on computer 6.
There are three subprogram, each functions are as follows: a time-frequency convert subprogram: utilize the fast algorithm implementation of discrete fourier transform for system program
Time-frequency convert function；B signal processing subprogram: by analyzing frequency-region signal, judge the effect of laser-impact, output judgement knot
Fruit；C controls subprogram: since control cabinet 7 is connected with laser 8 and manipulator 9, system program passes through control control cabinet 7
Laser 8 is automatically controlled according to judging result and manipulator 9 is shut down.
Laser-impact on-line measuring device of the present invention based on frequency of sound wave characteristic is using steps are as follows:
1. carrying out preparation before laser-impact: the clamping workpiece 10 on manipulator 9 makes work by the movement of manipulator 9
Part 10 is located in the focusing focus of laser beam, and absorbed layer 11 is pasted in workpiece pending district field surface, adjusts flowing water (constraint
Layer) 12 coating workpieces, 10 surface.
2. by bionic ear sound collecting device 1, Butterworth filter 2, common collector amplifying circuit 3, A/D converter 4 is logical
It crosses signal wire to be sequentially connected, last A/D converter 4 is connected on computer 6.Bionic ear sound collecting device 1 is placed on workpiece
At 10 top 50cm, it is therefore an objective under the premise of so that flowing water (restraint layer) 12 is not sputtered at bionic ear sound collecting device 1, obtain best
Information of acoustic wave.
3. by 4 kinds of failure frequency of sound wave signals and standing acoustic waves frequency signal input signal library.
4. starting laser 8 and manipulator 9 after open system program, start laser-impact.
5. amplitude and standard sound that the signal processing subprogram in system program will survey each frequency of frequency of sound wave signal
The amplitude of each frequency of frequency signal compares, the threshold of the frequency of sound wave signal frequency range if the amplitude of certain band frequency is above standard
Value K%, then the actual measurement frequency of sound wave signal is determined as disablement signal by the signal processing subprogram in system program, on the contrary then be
Normal signal, processing are normal.
6. the signal processing subprogram in system program will be judged in actual measurement frequency of sound wave signal and the signal library of failure
Failure frequency of sound wave signal compares, if all frequency ranges are all less than corresponding frequency band amplitude in certain failure frequency of sound wave signal
Threshold k %, then programmed decision failure mode exports failure cause, and system program issues instruction so that laser 8 and machinery
Hand 9 is shut down.Conversely, program output unknown cause failure, system program issues instruction so that laser 8 and manipulator 9 are shut down.
Claims (7)
1. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic, which is characterized in that described device includes: laser
Impulsive sound frequency signal library, system program, sample circuit；The sample circuit includes: sound collecting device, low-pass filter,
Common collector amplifying circuit and A/D converter；Sound collecting device, low-pass filter, common collector amplifying circuit, A/D converter
It is sequentially connected by signal wire, last A/D converter is connected on computer；Computer is connect by signal wire with control cabinet,
Control cabinet is connect with manipulator and laser respectively by signal wire；Sound collecting device is located on the workpiece of clamping machinery on hand
Side, distance should make flowing water restraint layer under the premise of not sputtering at bionic ear sound collecting device, obtain optimal information of acoustic wave；Swash
Light impulsive sound frequency signal library and system program installation are on computers；Pass through the actual measurement sound wave during detection laser-impact
Frequency of sound wave signal in frequency signal, with signal library compares, and realizes the on-line checking of laser-impact effect.
2. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as described in claim 1, which is characterized in that
The sound collecting device is used to collect the time-domain signal of sound wave using bionic ear sound collecting device.
3. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as described in claim 1, which is characterized in that
The low-pass filter uses Butterworth filter, for filtering out white noise, when setting its cutoff frequency as 1000Hz, and energy
Noise is reduced to one thousandth, if noise density is identical, the higher influence to overall noise voltage of frequency is bigger, institute
Overall noise voltage can be significantly reduced to remove high-frequency noise.
4. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as described in claim 1, which is characterized in that
The common collector amplifying circuit plays the role of amplifying electric current and power, and the A/D converter can turn simulated sound wave signals
It is changed to digital sound wave signal.
5. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as described in claim 1, which is characterized in that
There are three subprogram, each functions are as follows: a time-frequency convert subprogram: utilize the fast algorithm of discrete fourier transform for the system program
Realize time-frequency convert function；B signal processing subprogram: by analyzing frequency-region signal, judge the effect of laser-impact, output is sentenced
Disconnected result；C controls subprogram: since control cabinet is connected with laser and manipulator, system program passes through control control cabinet
It is shut down according to judging result automatic control manipulator and laser；The system program will survey sound by signal processing subprogram
The amplitude of each frequency of standing acoustic waves frequency signal in the amplitude and signal library of each frequency of frequency signal compares, if certain section
The amplitude of frequency is above standard the threshold k % of the frequency of sound wave signal frequency range, then the actual measurement frequency of sound wave signal is by system journey
Signal processing subprogram in sequence is determined as disablement signal, on the contrary then be normal signal, and processing is normally carried out；The system program
The actual measurement frequency of sound wave signal for being judged to failure is compared with the failure frequency of sound wave signal in signal library, if all frequency ranges are all
It is less than the threshold k % of corresponding frequency band amplitude in certain failure frequency of sound wave signal, then the programmed decision failure mode, output are lost
Reason is imitated, the system program issues instruction so that laser and manipulator are shut down；Conversely, program output unknown cause failure,
The system program issues instruction so that laser and manipulator are shut down.
6. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as claimed in claim 5, which is characterized in that
The calculation formula of the threshold k are as follows: K=B × S；Wherein, B indicates the width of the corresponding frequency of sound wave signal envelope in signal library
Value；Since the corresponding frequency of sound wave signal in signal library is different, therefore the amplitude of its envelope is also different, therefore each threshold
The equal non-correlation of value K%；S indicates safety coefficient.
7. a kind of laser-impact on-line measuring device based on frequency of sound wave characteristic as described in claim 1, which is characterized in that
The laser-impact frequency of sound wave signal library includes: that a laser goes out the frequency of sound wave signal that fails caused by photo-labile；B absorbs
Failure frequency of sound wave signal caused by layer is broken through by plasma；Fail frequency of sound wave signal caused by the ablation of c workpiece；D flowing water
Restraint layer is not covered with failure frequency of sound wave signal caused by workpiece；The laser-impact standing acoustic waves frequency signal that e does not fail.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438333A (en) * | 2019-09-19 | 2019-11-12 | 中国人民解放军空军工程大学 | A kind of kHz low-energy laser scanning impact reinforcing method and its device |
| CN110653223A (en) * | 2019-09-26 | 2020-01-07 | 厦门理工学院 | Laser cleaning monitoring device and monitoring method thereof and laser cleaning machine |
| CN114778695A (en) * | 2022-05-17 | 2022-07-22 | 西安科技大学 | Nondestructive monitoring and analysis method for rock burst mine anchor rod anchoring quality |
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| CN110438333A (en) * | 2019-09-19 | 2019-11-12 | 中国人民解放军空军工程大学 | A kind of kHz low-energy laser scanning impact reinforcing method and its device |
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