CN105215542B - Underwater Acoustic channels method in friction welding (FW) welding process - Google Patents
Underwater Acoustic channels method in friction welding (FW) welding process Download PDFInfo
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- CN105215542B CN105215542B CN201510660511.0A CN201510660511A CN105215542B CN 105215542 B CN105215542 B CN 105215542B CN 201510660511 A CN201510660511 A CN 201510660511A CN 105215542 B CN105215542 B CN 105215542B
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- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000003466 welding Methods 0.000 title claims abstract description 69
- 230000008569 process Effects 0.000 title claims abstract description 49
- 238000010586 diagram Methods 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 230000006641 stabilisation Effects 0.000 claims abstract description 10
- 238000011105 stabilization Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 238000009825 accumulation Methods 0.000 claims abstract description 5
- 230000005236 sound signal Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 230000004069 differentiation Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Computational Linguistics (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
The invention discloses a kind of Underwater Acoustic channels method in friction welding (FW) welding process, the technical problem for solving Underwater Acoustic channels method poor practicability in existing friction welding (FW) welding process.Technical scheme is to gather the acoustical signal that friction welding (FW) welding process whole process is sent using the capacitor type microphone, Short Time Fourier Transform is carried out to the acoustical signal collected, obtain the time-frequency combination distribution map of acoustical signal, screen the maximum of points of each frame FFT result of calculations in time-frequency combination distribution map, obtain every frame FFT result of calculations maximum scatter diagram, filter the point that frequency values in every frame FFT result of calculations maximum scatter diagram are less than 5000Hz, according to the accumulation shape of data point in scatter diagram, all dot-dash are divided into three classes, the quasi-steady stage in friction welding process is corresponded to respectively, stabilization sub stage and brake stage.The present invention to the acoustical signal in friction welding (FW) welding process by making simple process, you can realizes effective differentiation to friction welding (FW) welding process, practical.
Description
Technical field
The present invention relates to a kind of Underwater Acoustic channels method, Underwater Acoustic channels in more particularly to a kind of friction welding (FW) welding process
Method.
Background technology
The important prerequisite that friction welding (FW) is detected in real time is exactly that it is studied stage by stage, helps to further appreciate that and connects
The compacting mechanism of head, to realize the accurate control based theoretical of joint quality.Conventional method is by according to welding process
The change of middle friction torque, by welding process be divided into initially, quasi-steady, stably, brake upset four-stage, be directed to
Topmost technical problem is exactly the measurement of friction torque.The measurement of friction torque includes direct measurement and indirectly two kinds of sides of measurement
Method, direct method directly obtains torque data by pasting foil gauge in workpiece or main shaft, although it is existing that result is precisely but not suitable for production
Field is used；Indirect method is by measuring the friction torque of the output torque approximate estimation workpiece of main motor, although easy but error
It is larger.The inconvenience of torque measurement brings suitable difficulty to the differentiation of friction welding process different phase, therefore is badly in need of a kind of
New friction welding stage division method, it is simple and convenient and accurately realize this function.
The content of the invention
In order to overcome the shortcomings of Underwater Acoustic channels method poor practicability in existing friction welding (FW) welding process, the present invention provides one
Plant Underwater Acoustic channels method in friction welding (FW) welding process.This method gathers friction welding (FW) welding process using the capacitor type microphone
The acoustical signal that whole process is sent, Short Time Fourier Transform is carried out to the acoustical signal that collects, obtain acoustical signal when-frequency Joint Distribution
Figure, during screening-frequency Joint Distribution figure in each frame FFT result of calculations maximum of points, obtain every frame FFT result of calculation maximums
Scatter diagram, filters the point that frequency values in every frame FFT result of calculations maximum scatter diagram are less than 5000Hz, according to data in scatter diagram
Point accumulation shape, all dot-dash are divided into three classes, respectively correspond to friction welding process in the quasi-steady stage, the stabilization sub stage and
The brake stage.The present invention to the acoustical signal in friction welding (FW) welding process by making simple process, you can realizes to being welded to friction welding (FW)
Effective differentiation in quasi-steady stage, stabilization sub stage and upset stage of braking in termination process, and can be complete using existing welding machine
It is practical into operation.
The technical solution adopted for the present invention to solve the technical problems is：Underwater Acoustic channels in a kind of friction welding (FW) welding process
Method, is characterized in using following steps：
Step 1: selection frequency response range is gathered in 20Hz~20kHz capacitor type microphone as audio signal
Instrument；
Step 2: gathering the acoustical signal that friction welding (FW) welding process whole process is sent using the capacitor type microphone；
Step 3: carry out Short Time Fourier Transform to the acoustical signal that collects, obtain acoustical signal when-frequency Joint Distribution
Figure, the setup parameter of Short Time Fourier Transform is as follows：FFT length is 2560；Window function length is 1280；Overlap length is
1280；Window function type is Hanning window；
Step 4: screening when-frequency Joint Distribution figure in each frame FFT result of calculations maximum of points, by these maximums
Point-rendering obtains every frame FFT result of calculations maximum scatter diagram by transverse axis of the time, in the coordinate system of the longitudinal axis of frequency；
Step 5: filtering the point that frequency values in every frame FFT result of calculations maximum scatter diagram are less than 5000Hz, only retain frequency
Point of the rate scope in 5000Hz to 20000Hz；
Step 6: according to the accumulation shape of data point in scatter diagram, all dot-dash are divided into three classes, friction welding (FW) is corresponded to respectively
Quasi-steady stage, stabilization sub stage and brake stage in termination process.The frequency values of first kind point reduce rapidly with the time, correspondence weldering
The quasi-steady stage in termination process；The frequency values of Equations of The Second Kind point stablize constant with the time, the stabilization sub stage in correspondence welding process；
The frequency values of 3rd class point Discrete Stochastic in 5000Hz to 20000Hz broadband is distributed, the brake in correspondence welding process
The upset stage.
The beneficial effects of the invention are as follows：This method uses capacitor type microphone collection friction welding (FW) welding process whole process hair
The acoustical signal gone out, Short Time Fourier Transform is carried out to the acoustical signal that collects, obtain acoustical signal when-frequency Joint Distribution figure, sieve
When selecting-frequency Joint Distribution figure in each frame FFT result of calculations maximum of points, obtain every frame FFT result of calculations maximum scatterplot
Figure, filters the point that frequency values in every frame FFT result of calculations maximum scatter diagram are less than 5000Hz, according to data point in scatter diagram
Accumulation shape, all dot-dash are divided into three classes, and quasi-steady stage, stabilization sub stage and brake in friction welding process are corresponded to respectively
Stage.The present invention to the acoustical signal in friction welding (FW) welding process by making simple process, you can realizes to being welded to friction welding (FW)
Effective differentiation in quasi-steady stage, stabilization sub stage and upset stage of braking in journey, and can complete behaviour using existing welding machine
Make, it is practical.
The present invention is elaborated with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is Underwater Acoustic channels method and background technology method each phase contrast figure in friction welding (FW) welding process of the present invention.
Embodiment
Reference picture 1.Underwater Acoustic channels method is comprised the following steps that in friction welding (FW) welding process of the present invention：
1st, it is used as audio signal sampling instrument from the handheld microphones of MicW i436.
2nd, to 2024-T6 rodss and bars of aluminium alloy, (size of sample is：Diameter 25mm, length 100mm, surface roughness to be welded
0.8) Continuous Drive Friction Welding experiment is carried out, friction-welding technique parameter setting is：Rotating speed 1500RPM, friction pressure 80MPa,
Upsetting force 120MPa, rub shortening amount 5mm, and upsetter is made as brake upset and carried out simultaneously.Welded using microphone collection
The acoustical signal sent in journey.
3rd, by the friction welding voice signal collected carry out Short Time Fourier Transform, obtain acoustical signal when-frequency combine
Distribution map.Transformation parameter is：FFT length, 2560；Window function length, 1280；Overlap length, 1280；Window function type, the Chinese is peaceful
Window.
4th, the maximum of points of each frame FFT operation results in time-frequency two-dimensional collection of illustrative plates is screened, these maximum of points are plotted in
Using the time (unit is s) for transverse axis, frequency (unit is Hz) is in the coordinate system of the longitudinal axis, obtains every frame FFT operation results maximum
It is worth scatter diagram.
5th, the point that frequency values in every frame FFT operation results maximum scatter diagram are less than 5000Hz, only reserve frequency model are filtered
Be trapped among the point in 5000Hz to 20000Hz, by the step for, filtered out welding machine work ambient noise noise spot, only retain
Friction of workpiece adds thermogenetic high frequency friction to scream sound available point in welding process.
6th, according to the different coherent conditions of data point in scatter diagram, and according to time order and function order, three will be divided into a little
Class, the frequency values of first kind point reduce rapidly with the time, and duration is continuously the quasi-steady stage in 1.16s, correspondence welding process；
The frequency values of Equations of The Second Kind point stablize constant with the time, duration 3.03s, the stabilization sub stage in correspondence welding process；3rd class
The frequency values of point Discrete Stochastic in 5000Hz to 20000Hz broadband is distributed, duration 0.2s, in correspondence welding process
The brake upset stage.
Fig. 1 is by friction welding process each stage of time-frequency two-dimensional graph cut and each rank divided by friction torque
Section comparison diagram, two methods are good to the division correspondence in welding process each stage, thus illustrate, the inventive method can be substituted and rubbed
Calibrated wrench method is wiped as the effective treating method of friction welding process divided stages.
Claims (1)
1. a kind of Underwater Acoustic channels method in friction welding (FW) welding process, it is characterised in that comprise the following steps：
Step 1: selection frequency response range is used as audio signal sampling instrument in 20Hz~20kHz capacitor type microphone；
Step 2: gathering the acoustical signal that friction welding (FW) welding process whole process is sent using the capacitor type microphone；
Step 3: carry out Short Time Fourier Transform to the acoustical signal that collects, obtain acoustical signal when-frequency Joint Distribution figure, it is short
When Fourier transformation setup parameter it is as follows：FFT length is 2560；Window function length is 1280；Overlap length is 1280；Window letter
Several classes of types are Hanning window；
Step 4: screening when-frequency Joint Distribution figure in each frame FFT result of calculations maximum of points, these maximum of points are painted
Make by transverse axis of the time, frequency is in the coordinate system of the longitudinal axis, obtains every frame FFT result of calculations maximum scatter diagram；
Step 5: filtering point of the frequency values less than 5000Hz, only reserve frequency model in every frame FFT result of calculations maximum scatter diagram
It is trapped among the point in 5000Hz to 20000Hz；
Step 6: according to the accumulation shape of data point in scatter diagram, all dot-dash are divided into three classes, friction welding (FW) is corresponded to respectively and is taken over
Quasi-steady stage, stabilization sub stage and brake upset stage in journey；The frequency values of first kind point reduce rapidly with the time, correspondence weldering
The quasi-steady stage in termination process；The frequency values of Equations of The Second Kind point stablize constant with the time, the stabilization sub stage in correspondence welding process；
The frequency values of 3rd class point Discrete Stochastic in 5000Hz to 20000Hz broadband is distributed, the brake in correspondence welding process
The upset stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510660511.0A CN105215542B (en) | 2015-10-14 | 2015-10-14 | Underwater Acoustic channels method in friction welding (FW) welding process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510660511.0A CN105215542B (en) | 2015-10-14 | 2015-10-14 | Underwater Acoustic channels method in friction welding (FW) welding process |
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| CN105215542A CN105215542A (en) | 2016-01-06 |
| CN105215542B true CN105215542B (en) | 2017-10-10 |
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| CN107170466B (en) * | 2017-04-14 | 2020-12-29 | 中国科学院计算技术研究所 | Mopping sound detection method based on audio |
| CN111161728B (en) * | 2019-12-26 | 2022-08-30 | 珠海格力电器股份有限公司 | Awakening method, awakening device, awakening equipment and awakening medium of intelligent equipment |
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| KR20130062765A (en) * | 2011-12-05 | 2013-06-13 | 세종공업 주식회사 | Apparatus and method for monitoring of friction stir welding and friction stir spot welding process |
| CN102764927B (en) * | 2012-07-03 | 2014-10-22 | 广东技术师范学院 | Method for quantitatively evaluating stability of arc welding process based on sample entropy of arc sound sound spectrum |
| FR3015321B1 (en) * | 2013-12-20 | 2016-01-15 | Snecma | INERTIAL FRICTION WELDING MACHINE WITH IN SITU WELDING CONTROL DEVICE |
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