CN103143836A - Laser shock treatment device taking flowable liquid as energy absorption layer - Google Patents
Laser shock treatment device taking flowable liquid as energy absorption layer Download PDFInfo
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- CN103143836A CN103143836A CN2013100801414A CN201310080141A CN103143836A CN 103143836 A CN103143836 A CN 103143836A CN 2013100801414 A CN2013100801414 A CN 2013100801414A CN 201310080141 A CN201310080141 A CN 201310080141A CN 103143836 A CN103143836 A CN 103143836A
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Abstract
The invention discloses a laser shock treatment device taking flowable liquid as an energy absorption layer, and belongs to the technical field of laser processing. According to the laser shock treatment device, the laser shock energy absorption layer and a restraint layer are the flowable liquid; an absorption layer pump and a restraint layer pump inject the absorption layer and the restraint layer to the surface of a workpiece through a dual-channel pipeline, and continue to work to allow the absorption layer and the restraint layer to be in flowing states all the time; a control system controls flow velocities of the restraint layer and the absorption layer that flow through the surface of the workpiece through controlling flow rates of the two pumps, and allows the flow velocities of the two pumps to be the same; the flow velocities are less than a critical flow velocity maintaining the restraint layer and the absorption layer to be in laminar states; and the flowing restraint layer and the flowing absorption layer that are distinct in gradation, and stable in state and are in the laminar states are obtained. Serving as a convenient on-line updating method of the absorption layer, the laser shock treatment device can ensure that the energy absorption efficiency of each laser pulse is the same, is stable in shock effect, and is particularly applicable to same-point multiple continuous laser shock and high-density continuous laser shock courses.
Description
Technical field
The invention belongs to technical field of laser processing, refer in particular to a kind of with laser impact processing method and the device of flowable liquids as energy-absorbing layer.
Background technology
The typical process of laser-impact processing is: the workpiece to be processed surface covers absorbed layer and restraint layer successively, laser sees through restraint layer, the vertical irradiation workpiece, be absorbed by the absorption layer, absorbed layer gasification, ionization, blast, expansion are induced the high-pressure machinery shock wave at surface of the work, and super-pressure machinery shock wave is in surface of the work, induce residual compressive stress at surface of the work, above-mentioned mechanics effect can be used for the reinforced metal workpiece or causes workpiece generation plastic deformation.Wherein, restraint layer effect: by the restriction plasma expansion, increase the shock wave amplitude and extend the shock wave time, the absorbed layer effect: absorbing laser energy, and protection surface of the work.At present, restraint layer is generally K9 glass or water, and absorbed layer is aluminium foil or solidifies pitch-dark.With regard to processing step, current laser-impact processing, absorbed layer must spray in advance or paste in advance before laser-impact processing, after a laser pulse acts on absorbed layer, absorbed layer is ablated, gasification, ionization, and its thickness generally all can attenuation or fully destroyed.Impact with putting repeatedly continuous laser if need; perhaps on unit are, the high density continuous laser impacts; if absorbed layer is recoat or replacing not, the shock treatment effect of follow-up laser pulse is difficult to guarantee, the surface of the work without the absorbed layer protection also can be destroyed by laser ablation simultaneously.Therefore, in actual applications, after the absorbed layer attenuation or damaging, for fear of the ablated destruction of surface of the work or for guaranteeing impact effect, usually adopt the larger absorbed layer of thickness, perhaps off-line sprays or pastes absorbed layer again.Poor operability, efficient is low, affects very much applying of laser-impact process technology.
Summary of the invention
For the defective that exists in prior art and deficiency, the present invention proposes with the laser-impact device of flowable liquids as energy-absorbing layer, this device is applicable to impact processing with putting repeatedly continuous laser impact or high density continuous laser.
The technical solution adopted in the present invention is as follows: the laser-impact treating apparatus take flowable liquids as absorbed layer, comprise control system, restraint layer pump, absorbed layer pump, binary channels pipeline, restraint layer, absorbed layer, workpiece, described binary channels pipeline has two restraint layer passage and the absorbed layer passages of isolation mutually, described restraint layer pump is connected with the restraint layer passage through pipeline, and described absorbed layer pump is connected with the absorbed layer passage through pipeline; Described binary channels pipeline is placed in the side that workpiece is treated shock surface, and described absorbed layer passage is close to workpiece and is treated shock surface; Described control system is connected with the absorbed layer pump with the restraint layer pump respectively, described control system is used for controlling the flow of restraint layer pump and absorbed layer pump output liquid, described absorbed layer pump output absorbed layer liquid forms absorbed layer through the shock surface for the treatment of that the absorbed layer passage is expelled to workpiece, and described restraint layer pump output constraint layer liquid is expelled on described absorbed layer through the restraint layer passage and forms restraint layer; Described laser beam passes through the shock surface for the treatment of that restraint layer and absorbed layer impact workpiece successively; Described restraint layer liquid is identical with the absorbed layer flow rate of liquid and equal laminar flow v.
Described laminar flow v satisfies: v＜min (v1, v2); Wherein v1 is the laminar flow critical speed of described absorbed layer, and v2 is the laminar flow critical speed of restraint layer.
Described restraint layer liquid is the liquid to the incident laser high permeability; Described absorbed layer liquid is for there being the liquid of strong absorption to incident laser.
Described restraint layer liquid is water, described absorbed layer liquid be pitch-dark or the dilution pitch-dark.
The absorbed layer passage of described binary channels pipeline and the shape of cross section of restraint layer passage are all rectangle.
Advantage of the present invention and effect: with flowable liquid as absorbed layer, in the laser-impact process, absorbed layer is in flow regime all the time, do not exist absorbed layer to destroy problem, can guarantee that each pulsed laser energy absorption efficiency is consistent, impact effect is stable, is particularly useful for impacting and high density continuous laser impact process with putting repeatedly continuous laser.As a kind of online recoat method of absorbed layer very easily, be conducive to the industrial application of laser-impact process technology.
Description of drawings
The laser-impact treating apparatus schematic diagram of Fig. 1 take flowable liquids as absorbed layer;
Fig. 2 binary channels pipeline 4 cross sectional representation;
Wherein: 1. control system, 2. restraint layer pump, 3. absorbed layer pump, 4. binary channels pipeline, 5. restraint layer, 6. absorbed layer, 7. workpiece, 8. laser beam, 9. restraint layer passage, 10. absorbed layer passage.
The specific embodiment
As shown in Figure 1, to impact as example with putting repeatedly continuous laser, the laser-impact energy source is Nd
3+: the laser of the 1064nm of YAG output, its pulse width is nanosecond order.But flow constraint layer liquid can be any liquid to the incident laser high permeability, and selecting water in the present embodiment is restraint layer liquid; Absorbed layer liquid can be for there being arbitrarily the liquid of strong absorption to incident laser, select the pitch-dark conduct of the liquid absorbed layer liquid that can flow in the present embodiment, also can dilute by diluent and pitch-darkly can regulate pitch-dark ratio in absorbed layer liquid, obtain different extinction efficient.
As shown in Figure 2, the shape of cross section of two passages of binary channels pipeline 4 is rectangle, and the length of restraint layer passage 9 cross section rectangles is a, and wide is b, and the length of absorbed layer path 10 cross section rectangle is a, and wide is c; Water movement viscosity is μ 1, and pitch-dark kinematic viscosity is μ 2.According to the physical dimension at the interface of the kinematic viscosity of absorbed layer and restraint layer and restraint layer passage 9 and absorbed layer path 10, and in conjunction with critical Reynolds number Re, can get laminar flow flow velocity v.As shown in Figure 1, control system 1 is controlled the flow of restraint layer pump 2 and absorbed layer pump 3 interior liquid, makes restraint layer and absorbed layer flow velocity be v, just can realize having formed well arranged, in stable condition absorbed layer and restraint layer structure at surface of the work.
The concrete deterministic process of laminar flow flow velocity v is as follows.When liquid flowed in rectangular channel, the actual Reynolds number computing formula of liquid flow was Re=v * D/ μ, and v is the flow velocity of liquid, and μ is liquid kinematic viscosity, and D is the rectangular channel equivalent diameter, D=2 * length * wide/(long+wide).In order to guarantee that liquid is in laminar flow, must make Re less than critical Reynolds number, engineering be it is generally acknowledged reynolds number Re＜2000 in using, and liquid is in laminar condition, and therefore, critical Reynolds number is taken as 2000.For the present embodiment, the kinematic viscosity of known constraints layer and absorbed layer, and the physical dimension of passage are according to above-mentioned formula, can calculate respectively the laminar flow critical speed v1=2000 of restraint layer liquid (water) * μ 1/D1, restraint layer equivalent diameter D1=2ab/ (a+b); The laminar flow critical speed v2=2000 of absorbed layer liquid (pitch-dark) * μ 2/D2, the equivalent diameter D2=2ac/ of absorbed layer (a+c).In the laser-impact process, restraint layer pump 2 and absorbed layer pump 3 are under the control of control system, control the fluid flow of injection-constraint layer passage 9 and absorbed layer path 10, to guarantee that both flow velocity is identical, and the actual flow velocity v of restraint layer 5 and absorbed layer 6 must be lower than the smaller value in v1 and v2, be v＜min (v1, v2), formed well arranged, in stable condition absorbed layer and restraint layer structure at surface of the work thus.In this way, in putting repeatedly the continuous laser impact process together, after last laser pulse finishes, destroyed absorbed layer 6 has flowed away, and because liquid flows, new absorbed layer 6 has been set up, the energy absorption efficiency that has guaranteed each laser-impact is consistent, and impact effect is stable.In addition, in the laser-impact process, due to speed of expansion and the shock wave transmission speed of flow rate of liquid much smaller than laser-induced plasma, therefore, flowing of absorbed layer 6 and restraint layer 5 can not exert an influence to induced with laser shock wave process, and liquid flow can not affect the laser-impact effect.
Claims (5)
1. the laser-impact treating apparatus take flowable liquids as energy-absorbing layer, comprise control system (1), restraint layer pump (2), absorbed layer pump (3), binary channels pipeline (4); It is characterized in that, described binary channels pipeline (4) has two restraint layer passage (9) and the absorbed layer passages (10) of isolation mutually, described restraint layer pump (2) is connected with restraint layer passage (9) through pipeline, and described absorbed layer pump (3) is connected with absorbed layer passage (10) through pipeline; Described binary channels pipeline (4) is placed in the side that workpiece (7) is treated shock surface, and described absorbed layer passage (10) is close to workpiece (7) and is treated shock surface; Described control system (1) is connected 3 with restraint layer pump (2) with the absorbed layer pump respectively) be connected, described control system is used for controlling the flow of restraint layer pump (2) and absorbed layer pump (3) output liquid, described absorbed layer pump (3) output absorbed layer liquid forms absorbed layer (6) through the shock surface for the treatment of that absorbed layer passage (10) is expelled to workpiece (7), and described restraint layer pump (2) output constraint layer liquid is expelled to through restraint layer passage (9) and forms restraint layer (5) on described absorbed layer; Described laser beam (8) passes through the shock surface for the treatment of that restraint layer (5) and absorbed layer (6) impact workpiece (7) successively; Described restraint layer liquid is identical with the absorbed layer flow rate of liquid and equal laminar flow v.
2. a kind of laser-impact treating apparatus take flowable liquids as energy-absorbing layer according to claim 1, is characterized in that, described laminar flow v satisfies: v＜min (v1, v2); Wherein v1 is the laminar flow critical speed of described absorbed layer, and v2 is the laminar flow critical speed of described restraint layer.
3. a kind of laser-impact treating apparatus take flowable liquids as energy-absorbing layer according to claim 1, is characterized in that, described restraint layer liquid is the liquid to the incident laser high permeability; Described absorbed layer liquid is for there being the liquid of strong absorption to incident laser.
4. a kind of laser-impact treating apparatus take flowable liquids as energy-absorbing layer according to claim 1, is characterized in that, described restraint layer liquid is water, described absorbed layer liquid be pitch-dark or the dilution pitch-dark.
5. a kind of laser-impact treating apparatus take flowable liquids as energy-absorbing layer according to claim 1, is characterized in that, the absorbed layer passage of described binary channels pipeline (4) and the shape of cross section of restraint layer passage are all rectangle.
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| CN201310080141.4A CN103143836B (en) | 2013-03-14 | 2013-03-14 | Take flowable liquids as the laser shock treatment device of energy-absorbing layer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710493A (en) * | 2013-12-23 | 2014-04-09 | 江苏大学 | Laser shock processing method and device for liquid-state absorbing layer and liquid-state restraint layer |
| CN107523683A (en) * | 2017-07-31 | 2017-12-29 | 江苏大学 | A kind of laser impact intensified device and method for solvent-free composite machine knife plate |
| CN108655569A (en) * | 2018-04-13 | 2018-10-16 | 江苏大学 | A kind of impact of underwater laser is without mold progressive molding device and method |
| CN108728633A (en) * | 2018-06-25 | 2018-11-02 | 广东工业大学 | A kind of laser shock peening method and device |
| WO2020215596A1 (en) * | 2019-04-26 | 2020-10-29 | 中国科学院宁波材料技术与工程研究所 | Laser shock strengthening method and system |
| CN113881840A (en) * | 2020-07-03 | 2022-01-04 | 中国科学院沈阳自动化研究所 | Device and process for coating and removing laser shock strengthening absorption layer |
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| US7723643B2 (en) * | 2005-04-06 | 2010-05-25 | Lawrence Livermore National Security, Llc | Laser peening for reducing hydrogen embrittlement |
| CN102225491A (en) * | 2011-06-09 | 2011-10-26 | 安徽工业大学 | Method and device for forming metal reducer pipe based on laser shock wave technology |
| CN102626828A (en) * | 2012-04-26 | 2012-08-08 | 江苏大学 | Method and device for producing micro micro pits with high efficiency based on laser shock waves |
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Patent Citations (5)
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| US6554921B2 (en) * | 1999-02-19 | 2003-04-29 | Lsp Technologies, Inc. | Quality control plasma monitor for laser shock processing |
| US6841755B2 (en) * | 2001-01-23 | 2005-01-11 | Lsp Technologies Inc. | Overlay control for laser peening |
| US7723643B2 (en) * | 2005-04-06 | 2010-05-25 | Lawrence Livermore National Security, Llc | Laser peening for reducing hydrogen embrittlement |
| CN102225491A (en) * | 2011-06-09 | 2011-10-26 | 安徽工业大学 | Method and device for forming metal reducer pipe based on laser shock wave technology |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710493A (en) * | 2013-12-23 | 2014-04-09 | 江苏大学 | Laser shock processing method and device for liquid-state absorbing layer and liquid-state restraint layer |
| CN103710493B (en) * | 2013-12-23 | 2015-12-09 | 江苏大学 | The laser impact processing method of the liquid restraint layer of a kind of liquid absorbent layer and device |
| CN107523683A (en) * | 2017-07-31 | 2017-12-29 | 江苏大学 | A kind of laser impact intensified device and method for solvent-free composite machine knife plate |
| CN108655569A (en) * | 2018-04-13 | 2018-10-16 | 江苏大学 | A kind of impact of underwater laser is without mold progressive molding device and method |
| CN108655569B (en) * | 2018-04-13 | 2020-06-26 | 江苏大学 | Underwater laser impact die-free incremental forming device and method |
| CN108728633A (en) * | 2018-06-25 | 2018-11-02 | 广东工业大学 | A kind of laser shock peening method and device |
| CN108728633B (en) * | 2018-06-25 | 2019-11-08 | 广东工业大学 | A kind of laser shock peening method and device |
| WO2020215596A1 (en) * | 2019-04-26 | 2020-10-29 | 中国科学院宁波材料技术与工程研究所 | Laser shock strengthening method and system |
| CN111850284A (en) * | 2019-04-26 | 2020-10-30 | 中国科学院宁波材料技术与工程研究所 | Laser shock peening method and system |
| CN111850284B (en) * | 2019-04-26 | 2021-11-19 | 中国科学院宁波材料技术与工程研究所 | Laser shock peening method and system |
| CN113881840A (en) * | 2020-07-03 | 2022-01-04 | 中国科学院沈阳自动化研究所 | Device and process for coating and removing laser shock strengthening absorption layer |
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| CN103143836B (en) | 2015-11-18 |
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