CN104004901A - Laser shock processing device and method with magnetic fields as constraint layer - Google Patents
Laser shock processing device and method with magnetic fields as constraint layer Download PDFInfo
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- CN104004901A CN104004901A CN201410258269.XA CN201410258269A CN104004901A CN 104004901 A CN104004901 A CN 104004901A CN 201410258269 A CN201410258269 A CN 201410258269A CN 104004901 A CN104004901 A CN 104004901A
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Abstract
The invention provides a laser shock processing device with magnetic fields as a constraint layer. The laser shock processing device comprises an industrial personal computer, a laser device power source and power control module, a laser device, a laser guiding system, a focusing mirror, a cylindrical discharge tube, a sample, a sample clamp, an industrial control table and a rapid charge and discharge module. The cylindrical discharge tube is installed on the industrial control table. Lasers output by the laser device pass through the laser guiding system, transmit the focusing mirror and irradiate the surface of the sample to form impact. The portion, needing laser shock processing, of the sample is coated with an absorption layer, and the sample is installed on the industrial control table through the sample clamp. The magnetic fields in the direction perpendicular to the surface of the sample are generated through the cylindrical discharge tube and compress high-temperature and high pressure plasmas generated in the process of laser shock processing, so that the size of the plasmas is shrunk, and the effect of the laser shock processing is improved. The invention further provides a laser shock processing method with the magnetic fields as the constraint layer.
Description
Technical field
The present invention relates to field of laser processing, be specifically related to a kind of laser impact intensified apparatus and method of magnetic field as restraint layer of usining.
Background technology
Laser impact intensified (Lasershockprocessing is called for short LSP) technology is a kind of novel surface intensifying technology, is to utilize high power density (to be greater than 10
9w/cm
2), the laser beam of short pulse (ns level) sees through restraint layer irradiation to metal material surface, make the abundant absorbing laser energy of metallic surface absorption layer, at the utmost point, in the short period of time, vaporize, ionize formation plasma body, the plasma body constrained layer restriction of expanding produces high strength (GPa level) shockwave that impacts metal targets surface and propagate to metal inside, make material production surrender and viscous deformation, in shock zone, produce residual compressive stress simultaneously, improve intensity, hardness, wear resistance and the anticorrosion stress-resistant performance of material, especially can effectively improve the fatigue crack-resistant performance of material.
Restraint layer is the effective means that strengthens Effect of Laser Shock Processing, can only produce the surging force of MPa level, and after the layer that imposes restriction, surging force can be increased to GPa level without the laser-impact of restraint layer, significantly improves Effect of Laser Shock Processing.Yet a method that adopts the layer that imposes restriction to strengthen surging force has reduced the flexibility feature that general laser processing technology all possesses, become complexity and range of application of laser impact intensified technique narrowed down.For example: while utilizing glass as restraint layer, necessarily requiring by shock surface is plane, and glass is very easily broken, after impact, often needs to change, and can produce the phenomenon that glass fragment splashes while impacting, instrument and personnel are existed to potential safety hazard, and cleaning also very bothers; Utilize ice can solve as restraint layer the potential safety hazard that glass restraint layer exists, cleaning is convenient, but ice is easy to melt, and experimental installation tool is had a certain impact, and ice restraint layer needs in situ preparation, has had a strong impact on impact continuity and target efficiency; Although utilize flexible lamina can solve some above-mentioned defects as restraint layer, because restraint layer is flexible, the synergy of impact power is obvious not as the restraint layer of rigidity, and the selection of flexible lamina, manufactures and has relatively high expectations, and cost is also relatively high; Though can remove the restriction to finished surface shape while utilizing water as restraint layer, but water is complicated as the laser impact intensified device of restraint layer, trivial operations, can not guarantee the homogeneity of water constraint layer thickness, laser parameter be there are certain requirements, impact effect also has certain influence, and synergistic effect is not obvious; Other are as utilized high pressure gas also to have similar shortcoming as the certain methods of restraint layer.
Visible, the restraint layer that existing laser shock peening method adopts all has some limitations, be mainly due to adopted be entity restraint layer, thereby cause existing the potential safety hazard of splashing, inefficiency, surging force synergy to be subject to that limitation, lack of uniformity, device are complicated, trivial operations.Therefore, if can not use entity restraint layer also can realize, strengthen laser-impact power beyond doubt to laser shock peening method tremendous increase.
Summary of the invention
The present invention is directed to the shortcoming that existing restraint layer technology exists, a kind of laser impact intensified device of magnetic field as restraint layer of usining proposed, by add a cylindrical discharge tube (there is a coaxial cylindrical single turn wire coil outside) above sample, cylindrical discharge tube energising produces the magnetic field with specimen surface vertical direction, these magnetic fields can be compressed the High Temperature High Pressure plasma body producing in laser-impact process, volume of plasma is shunk, thereby strengthen the effect of laser-impact power.Magnetically confined layer replaces existing restraint layer, better strengthens laser impact intensified effect.The present invention also provides a kind of laser shock peening method of magnetic field as restraint layer of usining simultaneously.
The technical solution used in the present invention is:
Using magnetic field as the laser impact intensified device of restraint layer, comprise industrial computer, laser power supply and power control module, laser apparatus, light-conducting system, condensing lens, cylindrical discharge tube, sample, specimen holder, industry control platform and fast charging and discharging module;
Cylindrical discharge tube is arranged on industry control platform, cylindrical discharge tube Height Adjustable; Control fast charging and discharging module and be all connected with industry control platform with cylindrical discharge tube, by industry control platform control fast charging and discharging module, and then the size of controlling electric current in cylindrical discharge tube produces needed magnetic field;
Laser power supply is connected with industrial computer with power control module, is controlled the pulse of laser apparatus export by industrial computer; The laser beam of laser apparatus output, by light-conducting system, sees through condensing lens, is radiated at the surface of sample, forms and impacts; Described sample is coated with absorption layer at required laser impact intensified position, and sample is arranged on industry control platform by specimen holder.
The present invention also provides a kind of laser shock peening method of laser impact intensified device simultaneously, comprises the steps:
The first step: need the position of shock peening to apply absorption layer on the surface of sample;
Second step: sample is arranged on industry control platform by specimen holder; Make the laser beam of laser apparatus output by light-conducting system, see through condensing lens, vertical irradiation need to carry out the region of shock peening on the surface of sample, and makes to focus on focus and be positioned at area surfaces;
The 3rd step: regulate the height of cylindrical discharge tube, make its be just placed in sample directly over;
The 4th step: control fast charging and discharging module by industrial computer, and then control size of current in cylindrical discharge tube and generate needed magnetic field; The direction that cylindrical discharge tube produces magnetic field is all the time perpendicular to the surface of sample;
The 5th step: industrial computer is controlled laser apparatus by laser power supply and power control module and produced laser, laser beam converges in the absorption layer surface on sample through light-conducting system, condensing lens, produces High Temperature High Pressure plasma body; In the magnetic field that plasma body produces at cylindrical discharge tube, be compressed and produce downward surging force, form strong laser-impact;
The 6th step: repeatedly after laser impact intensified processing, industrial computer is controlled laser apparatus and stopped outgoing laser beam by method described in the 5th step;
The 7th step: take off sample, the remaining absorption layer of clean surface.
The present invention has following beneficial effect:
(1) be convenient to control, without drawing materials: the size in magnetic field can be controlled by industrial computer the size in the big or small indirect adjustments and controls magnetic field of electric current.Magnetic field is sightless, without rustling up constrained layer material, with low cost.
(2) can be used for processing the sample of different shape, not the constraint of test sample shape.For the sample of the shapes such as convex closure, pit, corner angle, processing effect is without any impact.
(3) safe and reliable, environmentally safe.Magnetic field itself is exactly cannot see, touch less than thing, can be not broken in impact process, can not splash, to experimenter and laser apparatus, can not cause any damage.
(4) simple in structure, easy to operate.Adopt the principle of electric magnetisation, only need a magnetic field generating apparatus.And can use for a long time.By industrial computer directly control electric current output, laser apparatus is exported, easy to operate, can realize the repeatedly bump of single-point single, multiple spot.
Accompanying drawing explanation
Fig. 1 is the structure iron of laser impact intensified device;
Fig. 2 is plasma pinch effect schematic diagram;
In figure, the implication of each label is as follows:
1, industrial computer; 2, laser power supply and power control module; 3, laser apparatus; 4, laser beam; 5, light-conducting system; 6, condensing lens; 7, cylindrical discharge tube; 8, absorption layer; 9, sample; 10, specimen holder; 11, industry control platform; 12, fast charging and discharging module.
Embodiment
Below in conjunction with accompanying drawing, describe details and the working condition of the inventive method and device in detail.
As shown in Figure 1, a kind ofly using the laser impact intensified device of magnetic field as restraint layer, it is characterized in that, comprise industrial computer 1, laser power supply and power control module 2, laser apparatus 3, light-conducting system 5, condensing lens 6, cylindrical discharge tube 7, sample 9, specimen holder 10, industry control platform 11 and fast charging and discharging module 12; Fast charging and discharging module 12 is comprised of electric capacity a and inductance b.
Cylindrical discharge tube 7 is arranged on industry control platform 11, cylindrical discharge tube 7 Height Adjustable; Control fast charging and discharging module 12 and be all connected with industry control platform 11 with cylindrical discharge tube 7, by industry control platform 11 control fast charging and discharging modules 12, and then the size of controlling electric current in cylindrical discharge tube 7 produces needed magnetic field;
Laser power supply is connected with industrial computer 1 with power control module 2, and the pulse of controlling laser apparatus 3 by industrial computer 1 is exported; The laser beam of laser apparatus 3 outputs, by light-conducting system 5, sees through condensing lens 6, is radiated at the surface of sample 9, forms and impacts; Described sample 9 is coated with absorption layer at required laser impact intensified position, and sample 9 is arranged on industry control platform 11 by specimen holder 10.
Adopting above-mentioned laser impact intensified device to carry out laser impact intensified method comprises the steps:
The first step: need the position of shock peening to apply absorption layer 8 on the surface of sample 9;
Second step: sample 9 is arranged on industry control platform 11 by specimen holder 10; Make the laser beam of laser apparatus 3 output by light-conducting system 5, see through condensing lens 6, vertical irradiation need to carry out the region of shock peening on the surface of sample 9, and makes to focus on focus and be positioned at area surfaces;
The 3rd step: regulate the height of cylindrical discharge tube 7, make its be just placed in sample 9 directly over (as Fig. 1 position);
The 4th step: control fast charging and discharging module 12 by industrial computer 1, and then control size of current in cylindrical discharge tube 7 and generate needed magnetic field; The direction that cylindrical discharge tube 7 produces magnetic fields is all the time perpendicular to the surface of sample 9;
The 5th step: industrial computer 1 is controlled laser apparatus 3 by laser power supply and power control module 2 and produced laser, laser beam 4 converges in absorption layer 8 surfaces on sample 9 through light-conducting system 5, condensing lens 6, produce High Temperature High Pressure plasma body, in the magnetic field that High Temperature High Pressure plasma body produces at cylindrical discharge tube 7, be compressed and produce downward surging force, form strong laser-impact;
The 6th step: repeatedly after laser impact intensified processing, industrial computer 1 is controlled laser apparatus 3 and stopped outgoing laser beam 4 by method described in the 5th step;
The 7th step: take off sample 9, the remaining absorption layer of clean surface.
Schematic diagram of the present invention as shown in Figure 2, is filled with gas in cylindrical discharge tube 7 (generally being made by glass or pottery) pipe, surrounds outside the cylindrical single turn wire coil d coaxial with cylindrical discharge tube e.Turn on-switch Kc, by the electric capacity a having charged rapidly to coil discharge, the electric current I (t) of the wire coil d that flows through in cylindrical discharge tube 7, produce one with cylindrical discharge tube 7 tubular axis variation magnetic field B (t) in the same way.Flow through between the strong current of plasma body g and the magnetic field of this electric current generation and interact, can cause that plasma body compresses to central zone, and plasma density, temperature are increased.Under the effect in the magnetic field that the plasma body g that laser-impact region produces produces at cylindrical discharge tube 7, to central zone, assemble, density increases, and plasma body g is motion so repeatedly under the constraint in magnetic field, thereby strengthens laser impact intensified effect.
Table 1 is depicted as the unrelieved stress of material itself, and there is magnetic field (magneticstrength is 0.5T) and without the comparison structure of the unrelieved stress under the action of a magnetic field, wherein material is 2024 aluminum alloy materials, the parameter of laser processing is that pulse energy is 8J, wavelength 1064nm, pulsewidth 10ns, spot diameter 6mm, power density 2.8GW/cm
2.Clearly, when the unrelieved stress that laser-impact 2024 aluminum alloy surface produce under the action of a magnetic field is all greater than without magnetic field and the unrelieved stress of 2024 aluminum alloy materials itself, illustrate that magnetic field played the effect of restraint layer really.
Table 1
It is apparent to one skilled in the art that the present invention can change into various ways, and such change is not thought and departed from the scope of the present invention.All so apparent modifications of the technician to described field, within being included in the scope of this claim.
Claims (2)
1. using the laser impact intensified device of magnetic field as restraint layer for one kind, it is characterized in that, comprise industrial computer (1), laser power supply and power control module (2), laser apparatus (3), light-conducting system (5), condensing lens (6), cylindrical discharge tube (7), sample (9), specimen holder (10), industry control platform (11) and fast charging and discharging module (12);
It is upper that cylindrical discharge tube (7) is arranged on industry control platform (11), cylindrical discharge tube (7) Height Adjustable; Controlling fast charging and discharging module (12) is all connected with industry control platform (11) with cylindrical discharge tube (7), by industry control platform (11), control fast charging and discharging module (12), and then the size of controlling electric current in cylindrical discharge tube (7) produces needed magnetic field;
Laser power supply is connected with industrial computer (1) with power control module (2), is controlled the pulse output of laser apparatus (3) by industrial computer (1); The laser beam of laser apparatus (3) output, by light-conducting system (5), sees through condensing lens (6), is radiated at the surface of sample (9), forms and impacts; Described sample (9) is coated with absorption layer at required laser impact intensified position, and sample (9) is arranged on industry control platform (11) by specimen holder (10).
2. the laser shock peening method based on laser impact intensified device described in claim 1, is characterized in that, comprises the steps:
The first step: need the position of shock peening to apply absorption layer (8) on the surface of sample (9);
Second step: sample (9) is arranged on industry control platform (11) by specimen holder (10); Make the laser beam of laser apparatus (3) output by light-conducting system (5), see through condensing lens (6), vertical irradiation need to carry out the region of shock peening on the surface of sample (9), and makes to focus on focus and be positioned at area surfaces;
The 3rd step: regulate the height of cylindrical discharge tube (7), make its be just placed in sample (9) directly over;
The 4th step: control fast charging and discharging module (12) by industrial computer (1), and then control size of current in cylindrical discharge tube (7) and generate needed magnetic field; The direction that cylindrical discharge tube (7) produces magnetic field is all the time perpendicular to the surface of sample (9);
The 5th step: industrial computer (1) is controlled laser apparatus (3) by laser power supply and power control module (2) and produced laser, laser beam (4) converges in absorption layer (8) surface on sample (9) through light-conducting system (5), condensing lens (6), produces High Temperature High Pressure plasma body; In the magnetic field that plasma body produces at cylindrical discharge tube (7), be compressed and produce downward surging force, form strong laser-impact;
The 6th step: repeatedly after laser impact intensified processing, industrial computer (1) is controlled laser apparatus (3) and stopped outgoing laser beam (4) by method described in the 5th step;
The 7th step: take off sample (9), the remaining absorption layer of clean surface.
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| CN201410258269.XA CN104004901A (en) | 2014-06-11 | 2014-06-11 | Laser shock processing device and method with magnetic fields as constraint layer |
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Cited By (7)
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| CN108445304A (en) * | 2018-03-21 | 2018-08-24 | 台州学院 | Plasma is to magnetic field compression characteristic experiment table |
| CN109706309A (en) * | 2017-10-26 | 2019-05-03 | 中国科学院沈阳自动化研究所 | One kind being based on laser impact intensified plasma stock wave constrained procedure |
| CN110791644A (en) * | 2019-08-23 | 2020-02-14 | 江苏大学 | Device and method for pulsed magnetic field assisted laser shock peening |
| CN111961836A (en) * | 2020-07-02 | 2020-11-20 | 江苏大学 | Device and method for strengthening composite of magnetic plasticity and laser shock |
| CN112430405A (en) * | 2020-12-11 | 2021-03-02 | 安徽威能电源科技有限公司 | Method for preparing antistatic coating from graphene-biomass raw material |
| CN112853086A (en) * | 2021-01-14 | 2021-05-28 | 常州大学 | Method and device for strengthening metal material by pulse current coupling laser shot blasting |
| CN115283368A (en) * | 2022-08-24 | 2022-11-04 | 南京航空航天大学 | Method for improving laser removal stability and efficiency of metal plate surface coating |
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| CN101024862A (en) * | 2006-09-27 | 2007-08-29 | 江苏大学 | Technical hole wall intensifying method based on laser impaction wave and apparatus |
| CN101524784A (en) * | 2009-04-22 | 2009-09-09 | 江苏大学 | Method and device for laser shock forming on the basis of polyurethane rubber film |
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| CN103014314A (en) * | 2012-12-25 | 2013-04-03 | 中国人民解放军空军工程大学 | Method for improving laser plasma shock wave pressure through magnetic and electric fields |
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| US6236016B1 (en) * | 1997-02-25 | 2001-05-22 | Lsp Technologies, Inc. | Oblique angle laser shock processing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109706309A (en) * | 2017-10-26 | 2019-05-03 | 中国科学院沈阳自动化研究所 | One kind being based on laser impact intensified plasma stock wave constrained procedure |
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| CN108445304B (en) * | 2018-03-21 | 2020-04-17 | 台州学院 | Experiment table for compression characteristic of plasma to magnetic field |
| CN110791644A (en) * | 2019-08-23 | 2020-02-14 | 江苏大学 | Device and method for pulsed magnetic field assisted laser shock peening |
| CN111961836A (en) * | 2020-07-02 | 2020-11-20 | 江苏大学 | Device and method for strengthening composite of magnetic plasticity and laser shock |
| CN112430405A (en) * | 2020-12-11 | 2021-03-02 | 安徽威能电源科技有限公司 | Method for preparing antistatic coating from graphene-biomass raw material |
| CN112853086A (en) * | 2021-01-14 | 2021-05-28 | 常州大学 | Method and device for strengthening metal material by pulse current coupling laser shot blasting |
| CN115283368A (en) * | 2022-08-24 | 2022-11-04 | 南京航空航天大学 | Method for improving laser removal stability and efficiency of metal plate surface coating |
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Application publication date: 20140827 |