CN100431768C - Method and device for measuring related parameter of underwater laser shock formation - Google Patents
Method and device for measuring related parameter of underwater laser shock formation Download PDFInfo
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- CN100431768C CN100431768C CNB2005100941580A CN200510094158A CN100431768C CN 100431768 C CN100431768 C CN 100431768C CN B2005100941580 A CNB2005100941580 A CN B2005100941580A CN 200510094158 A CN200510094158 A CN 200510094158A CN 100431768 C CN100431768 C CN 100431768C
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
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Abstract
The present invention relates to a method for measuring the influence of the thickness of a laser impact formation water film on impact wave parameters and a device, which is suitable for various states of detection by using liquid as a restraint layer and an impact wave transmitting medium. The device comprises a laser generator, a laser generator controlling system, a water film thickness regulation system, a pressure testing system, a restraint layer and an absorption layer material, wherein the laser generator controlling system controls the laser generator to generate laser pulses according preset parameters; laser beams irradiate an absorption layer by means of the restraint layer, wherein the absorption layer is coated on a sensor protective film; the absorption layer material is vaporized and ionized to generate impact waves, and the impact waves are transmitted to the surface of a sensor; the sensor is deformed under the action of pressure to generate an electric signal, and a detection device detects, amplifies, quantities and converts the electric signal; pressure curves of the waves are displayed on an oscilloscope. Finally, according to a detection result, the influence of the water film thickness of the restraint layer and the water film thickness of a conducting layer on the impact wave parameters is analyzed so as to determine optimal water film thicknesses of different laser energies.
Description
Technical field
The present invention relates to the field that is shaped fast, refer in particular to a kind of based on laser shock wave technology do assay method and the device that related parameter is arranged in the underwater laser shock formation of restraint layer with water or glass (and transparent membrane)-water, be applicable to all kinds of laser impact formings of doing restraint layer or shock wave transmitting medium with liquid.
Background technology
Because laser has blast effect, generally carry out theory and application study both at home and abroad based on the quick shaping machining of shock wave technology.Very narrow because of laser pulse, action time is extremely short, and the shock wave of its generation accordingly is also very short effective acting time, is unfavorable for component shaping, and the position addresses this problem, and generally uses the restraint layer technology.What wherein possessed practicality is that water is cooked restraint layer, and common way is directly to spray water at surface of the work, and the moisture film that utilizes nature to form retrains the expansion of the gas of laser vaporization, to increase the shock wave peak pressure and to prolong shock wave effective acting time.Generally all do not take into full account as for the influence of water film thickness binding effect.
With the most approaching technology of the present invention be to the determination techniques of water depth effect during underwater explosion is shaped.It is that the detonation wave that utilizes explosive charge to produce is a component shaping at the place of certain depth of water placement explosive that underwater explosion is shaped, and wherein the depth of water has certain influence to component shaping.The depth of water generally was to measure by indirect method to the mensuration of detonation wave intensity effect during underwater explosion was shaped, promptly lay explosive in the underwater of certain depth and in the same degree of depth apart from explosive certain distance place work piece, the deflection of workpiece is judged the influence of the depth of water to detonation wave intensity when measuring the different depth of water.Utilize liquid such as water to do the laser impact forming of restraint layer and underwater explosion in principle and be shaped similarly, and laser impact forming is because laser parameter accurately controlled, the forming accuracy height, and security is good, therefore has more wide prospect.
Summary of the invention
The objective of the invention is that carrying waters and do the assay method and the device of water film thickness shock wave parameter influence in the laser impact forming technology of restraint layer.
The invention is characterized in and utilize laser blast wave as the plastic force source, Yi Shui, water-transparent membrane and glass-water make up as restraint layer respectively, with piezoelectric ceramics as pressure sensor, the pressure and the time relationship of shock wave under the different water film thicknesses of online detection.
The device of implementing the inventive method comprises laser generator, laser generator control system, it is characterized in that water film thickness regulating system, pressure detecting system, restraint layer and absorbed layer material; Pressure detecting system is overlayed on the base successively by sensor protection film, pressure sensor in this device, and wherein pressure sensor links to each other with pressure-detecting device, oscillograph, microcomputer through lead and forms.The pressure sensor diaphragm that scribbles the absorbed layer material covers the pressure sensor surface; and be installed on the base together with pressure sensor; and sensor is given pressure-detecting device by lead with electrical signal transfer; pressure-detecting device is presented at the pressure that records on the oscillograph, sends data to computer again simultaneously.
For the detection of Free water film thickness shock wave intensity effect, its water film thickness regulating system by tank and be located at its bottom osculum, drainpipe, draining valve form, restraint layer is a water.For the detection of constraint water film thickness shock wave intensity effect, its water film thickness regulating system is made up of with " O " RunddichtringO, adjusting screw(rod), the adjusting support that are connected successively that are positioned at its side tank, and restraint layer is glass and water.
Press predefined parameter by laser generator control system control laser generator and produce laser pulse; laser beam shines on the absorbed layer that is coated on the sensor protection film by restraint layer; the vaporization of absorbed layer material, ionization produce shock wave; be delivered to sensor surface through diaphragm; the sensor generation signal of telecommunication that deforms under pressure; checkout gear detects this signal through amplifying, demonstrate the pressure curve of shock wave after the value conversion on oscillograph, and will detect data and be kept in the microcomputer.Regulate water film thickness and detect shock strength under the different water film thicknesses.Determine best restraint layer water film thickness under the different laser intensities according to testing result intensity.
Implementation process of the present invention is as follows:
1. on the sensor protection film, be coated with the absorbed layer material.
2. diaphragm is covered sensor surface and and sensor be installed on the base together.
3. pressure sensor, pressure-detecting device, oscillograph, computer are coupled together with lead.
4. send laser pulse by laser generator control device control laser generator energy, spot diameter on request, laser beam speculum (being used for the detection of free moisture film restraint layer), restraint layer shine absorbed layer, thereby the absorbed layer vaporization produces shock wave causes the pressure sensor distortion to produce potential difference at sensor the two poles of the earth, checkout gear detects this potential difference signal and shows on oscillograph with graphic form through amplification, value conversion, and data is delivered to microcomputer preserve.
5. progressively adjust laser power and detect shock wave pressure under the different capacity.
6. the adjustment water film thickness repeated for 4,5 steps, detected shock wave parameter under the various water film thicknesses.
7. analyze the influence of water film thickness shock wave parameter according to testing result, determine best water film thickness under the different laser powers, in order to instruct concrete processing.
The invention has the advantages that:
(1) be in the laser-impact processing of restraint layer at present with liquid, water film thickness is difficult for accurately control when the shock wave parameter that detection laser drives, this device can accurately be regulated water film thickness by the water film thickness regulating system, thereby records the shock wave parameter under the different water film thicknesses.
(2) adopt transient response characteristic that overlay film is arranged than the good piezoelectric ceramics of pvdf membrane as pressure sensor, the problem of avoiding piezoelectric ceramics easily to be smashed by the attenuation of overlay film shock wave by shock wave, piezoelectric ceramics is worked, the high pressure that has overcome pressure sensor adjust difficulty and the narrow defective of linear zone in the range of linearity.
(3) the present invention can be at detecting with the various situations of liquid as restraint layer or transmission medium, to determine the influence of water film thickness shock wave parameter under the different situations, thereby select best restraint layer water film thickness and transmit the WATER AS FLOW MEDIUM film thickness, and be used for actual processing, so that obtain best impact forging effect.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing:
Fig. 1 is the checkout gear of free moisture film as restraint layer.
Fig. 2 is to be the checkout gear of glass (or transparent membrane)-water combination as restraint layer with the constraint moisture film.
1. laser generator 2. laser beams 3. speculums 4. scales 5. tanks 6. absorbed layers 7. pressure sensor diaphragms 8. pressure sensors 9. leads 10. water 11. osculums 12. draining valves 13. drainpipes 14. bases 15. laser generator control device 16. oscillographs 17. checkout gear 18. computers, 19. glass (or transparent membrane) 20. " O " RunddichtringOs 21. adjusting screw(rod)s 22. are regulated support
The specific embodiment
Describe the details and the working condition of the concrete device of the present invention's proposition in detail below in conjunction with accompanying drawing.
The device of implementing the inventive method comprises laser generator 1, laser generator control system 15, water film thickness regulating system, pressure detecting system, restraint layer and absorbed layer material 6.Wherein pressure detecting system is made up of sensor protection film 7, pressure sensor 8, base 14, lead 9, pressure-detecting device 17, oscillograph 16, microcomputer 18.For the detection of Free water film thickness shock wave intensity effect, its water film thickness regulating system is made up of tank 5, osculum 11, drainpipe 13, draining valve 12, and restraint layer is a water 10.For the detection of constraint water film thickness shock wave intensity effect, its water film thickness regulating system is made up of tank 5, " O " RunddichtringO 20, adjusting screw(rod) 21, adjusting support 22, and restraint layer is glass (or transparent membrane) 19 and water 10.
The pressure sensor diaphragm 7 that scribbles absorbed layer material 6 covers pressure sensor 8 surfaces; and and pressure sensor 8 be installed in together on the base 14; and sensor 8 is given pressure-detecting device 17 by lead 9 with electrical signal transfer; pressure-detecting device 17 is presented at the pressure that records on the oscillograph 16, again data is sent to computer 18 simultaneously.
The laser generator produce power is at 10～100 joules, and the laser pulse of 8～80 nanoseconds of duration, but various modes such as the facular model basic mode of laser beam, multimode are by the control device control and the adjusting of laser generator.
The laser pulse light beam that laser generator produces sees through restraint layer (moisture film or glass (transparent membrane)-moisture film) through light-conducting system and shines on the absorbed layer, by wherein power conversion bulk absorption and cause that the vaporization of constrained layer material, ionization produce shock wave, shock wave is delivered to sensor surface deforms sensor, on two electrodes of sensor, produce potential difference, checkout gear detects this potential difference and show the shock wave figure on oscillograph after amplification, value conversion, and data is sent into microcomputer preserve.By adjusting laser power, spot diameter, water film thickness, can record the shock wave parameter under different laser energy, restraint layer and the transfer layer water film thickness, at last according to the influence that detects data analysis water film thickness shock wave parameter, and best restraint layer water film thickness and transfer layer water film thickness under definite different laser energy, be used to instruct the laser impact forming of specifically doing restraint layer, in the hope of obtaining best forming effect with water.
Claims (5)
1. the determinator that related parameter is arranged in the underwater laser shock formation; comprise laser generator, laser generator control system, it is characterized in that being provided with the water film thickness regulating system, pressure detecting system, restraint layer and absorbed layer material; restraint layer is water (10) or glass (19) and water (10); pressure detecting system is overlayed on the base (14) successively by sensor protection film (7), pressure sensor (8) in this device, and wherein pressure sensor (8) links to each other and forms with pressure-detecting device (17), oscillograph (16), microcomputer (18) through lead (9).
2. the determinator that related parameter is arranged in the underwater laser shock formation according to claim 1, it is characterized in that detection for Free water film thickness shock wave intensity effect, described water film thickness regulating system by tank (5) and be located at its bottom osculum (11), drainpipe (13), draining valve (12) form, restraint layer is water (10).
3. the determinator that related parameter is arranged in the underwater laser shock formation according to claim 1, it is characterized in that detection for constraint water film thickness shock wave intensity effect, its water film thickness regulating system is made up of with " O " RunddichtringO (20) that is connected successively that is positioned at its side, adjusting screw(rod) (22), adjusting support (21) tank (5), and restraint layer is glass (19) and water (10).
4. the assay method that related parameter is arranged in the underwater laser shock formation that uses the described determinator of claim 1 and realize; it is characterized in that: press predefined parameter by laser generator control system control laser generator and produce laser pulse; laser beam shines on the absorbed layer that is coated on the sensor protection film by restraint layer; the vaporization of absorbed layer material; ionization produces shock wave; be delivered to the pressure sensor surface through diaphragm; the pressure sensor generation signal of telecommunication that deforms under pressure; pressure-detecting device detects this signal through amplifying; value conversion back demonstrates the pressure curve of shock wave on oscillograph, and will detect data and be kept in the microcomputer.
5. the described determinator of use the claim 1 according to claim 4 and assay method of related parameter is arranged in the underwater laser shock formation realized, it is characterized in that: regulate water film thickness and detect shock strength under the different water film thicknesses, determine best restraint layer water film thickness under the different laser intensities according to testing result intensity.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100941580A CN100431768C (en) | 2005-08-31 | 2005-08-31 | Method and device for measuring related parameter of underwater laser shock formation |
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| CNB2005100941580A CN100431768C (en) | 2005-08-31 | 2005-08-31 | Method and device for measuring related parameter of underwater laser shock formation |
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| CN1751838A CN1751838A (en) | 2006-03-29 |
| CN100431768C true CN100431768C (en) | 2008-11-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626826A (en) * | 2012-04-26 | 2012-08-08 | 江苏大学 | High efficiency apparatus and method based on laser shock wave for manufacturing micro grooves |
| CN103028839A (en) * | 2012-12-28 | 2013-04-10 | 江苏大学 | Laser impact method and device for controlling thickness of liquid restraint layer |
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| CN102125951B (en) * | 2010-12-24 | 2012-12-19 | 江苏大学 | Method and device for laser pulse and electromagnetic pulse composite forming of metal sheet |
| CN102519642B (en) * | 2011-11-25 | 2014-12-03 | 江苏大学 | Method and device for detecting pressure of laser shock wave |
| CN102732695A (en) * | 2012-06-23 | 2012-10-17 | 吉林大学 | Metal surface laser processing method in liquid medium |
| CN103008882A (en) * | 2012-12-12 | 2013-04-03 | 桂林电子科技大学 | Micro-processing method and system for pulse laser fragile material |
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| CN105652797A (en) * | 2016-01-06 | 2016-06-08 | 广东工业大学 | Real-time monitoring device and real-time monitoring method of surface flow water film |
| CN105728954B (en) * | 2016-04-27 | 2017-04-19 | 桂林电子科技大学 | Method and system for processing immersed workpiece by double laser light |
| CN108655569B (en) * | 2018-04-13 | 2020-06-26 | 江苏大学 | Underwater laser impact die-free incremental forming device and method |
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| CN111408840B (en) * | 2020-04-07 | 2021-10-19 | 哈尔滨工业大学（威海） | Device for assisting underwater laser deposition or material increase through induction heating and use method |
| CN111707566B (en) * | 2020-06-24 | 2023-07-07 | 太原理工大学 | Experimental system for researching dynamic response of structure under impact load and application method |
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| US4937421A (en) * | 1989-07-03 | 1990-06-26 | General Electric Company | Laser peening system and method |
| US6049058A (en) * | 1998-12-15 | 2000-04-11 | Lsp Technologies, Inc. | Laser peening process and apparatus with uniform pressure pulse confinement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626826A (en) * | 2012-04-26 | 2012-08-08 | 江苏大学 | High efficiency apparatus and method based on laser shock wave for manufacturing micro grooves |
| CN102626826B (en) * | 2012-04-26 | 2015-02-04 | 江苏大学 | High efficiency apparatus and method based on laser shock wave for manufacturing micro grooves |
| CN103028839A (en) * | 2012-12-28 | 2013-04-10 | 江苏大学 | Laser impact method and device for controlling thickness of liquid restraint layer |
| CN103028839B (en) * | 2012-12-28 | 2015-10-28 | 江苏大学 | A kind of laser shock method and device controlling fluid restriction layer thickness |
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| CN1751838A (en) | 2006-03-29 |
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