CN103302406B - Intra-light water delivery laser shock peening method and device - Google Patents
Intra-light water delivery laser shock peening method and device Download PDFInfo
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- CN103302406B CN103302406B CN201310245934.7A CN201310245934A CN103302406B CN 103302406 B CN103302406 B CN 103302406B CN 201310245934 A CN201310245934 A CN 201310245934A CN 103302406 B CN103302406 B CN 103302406B
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Abstract
The invention discloses an intra-light water delivery laser shock peening method and a device. A spray head which is arranged in a hollow laser beam formed after light path transformation of a circular laser beam and at the bottom of a main water pipe coaxial with the hollow laser beam sprays water to a to-be-processed area of a workpiece in the whole circumferential direction to form a stable water restraint layer with uniform thickness, so that the uniform distribution of residual compressive stress on the surface of the workpiece is better ensured. The water restraint layer formed by the method is not influenced by the surface appearance and surface quality of the workpiece, and the method is suitable for processing the curved workpiece, such as a blade. In addition, the adopted hollow laser beam also facilitates significantly reducing a stress hole effect on the surface layer of the workpiece.
Description
Technical field
The present invention relates to field of laser processing, refer in particular to a kind of laser impact intensified method, and realize the device of this method, be suitable for processing curve workpiece, as blade etc.
Background technology
Laser impact intensified LSP, is laser peening again, is a kind of novel material surface strengthening technology, utilizes strong laser induced knock wave mechanics effect to process material, has the features such as high pressure, high energy, ultrafast and Under High Strain rate.The stress that its residual compressive stress layer formed can eliminate material internal is effectively concentrated and suppresses the initiation and propogation of crackle, can significantly improve the fatigue life of metal parts and anticorrosive and antiwear property.
Realize the mechanics strengthening effect of laser blast wave, must use restraint layer in laser-impact process, restraint layer covers surface of the work, and the composition of its thickness, material and performance directly affect laser impact intensified effect.At present, in domestic and foreign literature and test, the restraint layer medium that uses comprises K9 optical glass, lucite, silica gel, synthetic resin and water etc.The advantage of water constraint layer is cheapness, clean, repeating effect is good, can processing curve, and flowing water constraint layer can take away plasma blast after solid dust particle, have obvious advantage, in industry, laser impact intensified structural metal component uses water constraint layer usually.Stable, uniform water constraint layer forms the distribution of even residual compressive stress at workpiece surface, improves the important guarantee of fatigue life.
The current domestic method and apparatus adopting traditional water constraint layer, is namely sprayed water towards surface of the work along a direction by the flat burner of external faucet, forms thickness and be about the flowing water curtain of 2-3 mm as restraint layer more.The weak point of the method is: in order to avoid turbulent flow appears in machining area, there is certain distance in injection point and machining area, therefore can not ensure to spray water in workpiece movable process the synchronism of action and laser-impact action, can affect the stability of machining area water constraint layer.In addition, workpiece surface appearance and the impact of surface quality on machining area water constraint layer larger, easily space is formed between convex portions curved surface and water constraint layer when surface of the work is curved surface, thus incoming laser beam ablation surface of the work, form processing to destroy, the moisture film that concave part Surface forming is thicker affects Effect of Laser Shock Processing; Even if when surface of the work is plane, the difference due to zones of different surface quality also can make machining area water constraint layer occur turbulent flow.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the method and apparatus that a kind of smooth inner water-supply is laser impact intensified, improving the stability of territory, work area water constraint layer, avoid processing to destroy, improve Effect of Laser Shock Processing.
In order to solve above technical problem, concrete technical scheme of the present invention is as follows:
The laser impact intensified device of a kind of light inner water-supply, comprising: laser instrument (1), laser control device (2), optical path changer (4), fixture (13), five axle workbench (14), water main (5), shower nozzle (9), water inlet pipe (10), water flow controller (12) and water tank (11); Laser instrument (1) is positioned at five axle workbench (14) opposites; Laser control device (2) is connected on laser instrument (1), controls the output pulse energy of laser instrument, spot diameter and pulse width; Fixture (13) is arranged on five axle workbench (14); Optical path changer (4) is positioned between laser instrument (1) and five axle workbench (14); Water main (5) is arranged on optical path change device (4); Shower nozzle (9) is threaded connection with the connector of water main (5) bottom; Water inlet pipe (10) one end is connected with water main (5) upper end, and the other end is connected with water tank (11); Water flow controller (12) is connected on water inlet pipe (10), for controlling flow and the pressure of current.
Described water main (5) is stainless steel, and upper end seals, and bottom and upside are provided with connector, and coaxial with hollow laser bundle.
The working face of described shower nozzle (9) to be drift angle the be taper seat of 170 °, delivery port width D is 1-2 mm.
Described water flow controller (12) is for controlling water flow pressure value scope at 0.1-0.3 MPa, and the spray cycle simultaneously controlling current is consistent with the cycle of laser-impact.
A kind of method utilizing the laser impact intensified device of described smooth inner water-supply laser impact intensified to light inner water-supply, it is characterized in that: current spray to workpiece by the shower nozzle in the hollow laser bundle that is arranged on circular laser beam and formed after light chopper and bottom the water main coaxial with hollow laser bundle along whole circumference and form the uniform water constraint layer of thickness, make described water constraint layer not be subject to the impact of workpiece surface appearance and surface quality, specifically comprise the following steps:
Step one, opens laser instrument, by the output pulse energy of laser control device setting laser device, and spot diameter and pulse width;
Step 2, is converted to hollow laser bundle by optical path changer by circular laser beam, and coaxially and do not interfere with water main, the internal diameter of hollow laser bundle is equal with shower nozzle external diameter for described hollow laser bundle and water main;
Step 3, closes laser instrument, is arranged on the fixture of five axle workbench after surface of the work being coated absorbed layer, then by five axle movable workbench workpiece, makes the distance of its region to be processed and shower nozzle bottom surface be
, L is the large amount out of bottom surface, shower nozzle top radius ratio bottom face radius;
Step 4, open tank switch, regulate water flow pressure by water flow controller, make workpiece region surface to be processed form stable, thickness and be 1-2 mm and equally distributed water constraint layer, and then set spray cycle, ensure the synchronism of water spray action and laser-impact action;
Step 5, opens laser instrument and starts to carry out laser impact intensified to surface of the work, controls the movement of workpiece and rotation complete strengthening to whole surface of the work by five axle workbench.
Current are taper seat ejection by shower nozzle whole circumferencial direction bottom water pipe, and the drift angle scope of taper seat is 150 °-180 °.
Innovation of the present invention is, current spray to machining area and form water constraint layer in hollow laser beam, its injection point and machining area are close to, by arranging spray cycle and laser-impact cycle, and the synchronism of can effectively ensure to spray water in workpiece movable process action and laser-impact action; Meanwhile, the water constraint layer stability that the method is formed and uniformity by the impact of the outer workpiece surface appearance of machining area and surface quality, the problem of water constraint layer stability and uniformity when effectively can solve processing curve workpiece.
Beneficial effect of the present invention is as follows: adopt hollow laser to carry out laser impact intensified " stress hole " effect that significantly can reduce workpiece surface, be conducive to being uniformly distributed of workpiece surface residual compressive stress; Current are evenly sprayed along whole circumference by the shower nozzle bottom water main, just the uniform water constraint layer of thickness can be formed in the region to be processed that surface of the work is very little by the flow and pressure that control current, thus make workpiece surface produce uniform residual compressive stress, and the impact of workpiece surface appearance and surface quality can not be subject to.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Figure 1 shows that the schematic diagram that light inner water-supply is laser impact intensified.
In figure: 1. laser instrument, 2. laser control device, 3. circular laser beam, 4. optical path change device, 5. water main, 6. hollow laser bundle, 7. workpiece, 8. absorbed layer, 9. shower nozzle, 10. water inlet pipe, 11. water tanks, 12. water flow controllers, 13. fixtures, 14. 5 axle workbench.
Fig. 2 is nozzle structure schematic diagram.
In figure: 15. connecting threads, 16. water inlets, 17. conical water outlets, 18. connecting rods.
Detailed description of the invention
Particular content of the present invention is described in detail below in conjunction with accompanying drawing.
Embodiment one:
The device that smooth inner water-supply is laser impact intensified, as shown in Figure 1, comprising: laser instrument 1, laser control device 2, optical path changer 4, fixture 13, five axle workbench 14, water main 5, shower nozzle 9, water inlet pipe 10, water flow controller 12 and water tank 11; Wherein shower nozzle 9 structure as shown in Figure 2, comprising: connecting thread 15, water inlet 16, conical water outlet 17, connecting rod 18.
Fixture 13 is arranged on five axle workbench 14; Laser instrument 1 is positioned at five axle workbench 14 opposites; Laser control device 2 is connected on laser instrument 1, controls the output pulse energy of laser instrument, spot diameter and pulse width; Optical path changer 4 between laser instrument 1 and five axle workbench 14, for circular laser beam 3 is transformed to hollow laser bundle 6; Water main 5 is arranged on optical path change device 4; Shower nozzle 9 is threaded connection with the connector bottom water main 5; Connector on the upside of water inlet pipe 10 one end and water main 5 is threaded connection, and the other end is connected with water tank 11; Water flow controller 12 is connected on water inlet pipe 10, for controlling flow and the pressure of current; Upper and lower two parts of shower nozzle 9 are welded together by connecting rod 18, and form the delivery port 17 of taper, there is connecting thread 15 its upper end, and centre is water inlet 16.
Embodiment two:
The concrete steps implementing light inner water-supply laser impact intensified are:
(1) laser instrument 1 is opened, by output pulse energy 6 J of laser control device 2 setting laser device 1, spot diameter 3 mm and pulse width 20 ns;
(2) by optical path changer 2, circular laser beam 3 is converted to hollow laser bundle 6, require this hollow laser bundle 6 and water main 5 coaxially and do not interfere with water main 5, the internal diameter of hollow laser bundle 6 is equal with the external diameter of shower nozzle 9, is 4 mm;
(3) close laser instrument 1, be arranged on after absorbed layer 8 is coated on workpiece 7 surface on the fixture 13 of five axle workbench 14, then select shower nozzle delivery port width
dbe 1 mm,
lbe 1.2 mm, according to formula
by five axle workbench 14 travelling workpieces 7, the distance of its region to be processed and shower nozzle 9 bottom surface is made to be 0.1 mm;
(4) switch of water tank 11 is opened, the pressure of current is regulated to be 0.1MPa by water flow controller 12, current are taper seat ejection by shower nozzle whole circumferencial direction bottom water pipe, the drift angle of taper seat is 150 °, make workpiece 7 region surface to be processed form stable, thickness and be 1-2 mm and equally distributed water constraint layer, and then set spray cycle, ensure the synchronism of water spray action and laser-impact action;
(5) open laser instrument 1 to start to carry out laser impact intensified to workpiece 7 surface, control the movement of workpiece 7 and rotation by five axle workbench 14 and complete strengthening to whole workpiece 7 surface.
Embodiment three:
By the shower nozzle delivery port width in embodiment two
dbe set to 1.5 mm, the pressure of current is set to 0.2 MPa, and the drift angle of taper seat is 170 °, other method and step constant.
Embodiment four:
By the shower nozzle delivery port width in embodiment two
dbe set to 2 mm, the pressure of current is set to 0.3 MPa, and the drift angle of taper seat is 180 °, other method and step constant.
Claims (5)
1. the laser impact intensified device of light inner water-supply, is characterized in that comprising: laser instrument (1), laser control device (2), optical path changer (4), fixture (13), five axle workbench (14), water main (5), shower nozzle (9), water inlet pipe (10), water flow controller (12) and water tank (11); Laser instrument (1) is positioned at five axle workbench (14) opposites; Laser control device (2) is connected on laser instrument (1), controls the output pulse energy of laser instrument, spot diameter and pulse width; Fixture (13) is arranged on five axle workbench (14); Optical path changer (4) is positioned between laser instrument (1) and five axle workbench (14); Water main (5) is arranged in optical path changer (4); Shower nozzle (9) is threaded connection with the connector of water main (5) bottom; Water inlet pipe (10) one end is connected with water main (5) upper end, and the other end is connected with water tank (11); Water flow controller (12) is connected on water inlet pipe (10), for controlling flow and the pressure of current;
Described water main (5) is stainless steel, and upper end seals, and bottom and upside are provided with connector, and coaxial with hollow laser bundle.
2. the laser impact intensified device of light inner water-supply as claimed in claim 1, is characterized in that: the working face of described shower nozzle (9) to be drift angle the be taper seat of 170 °, delivery port width D is 1-2 mm.
3. the laser impact intensified device of light inner water-supply as claimed in claim 1, it is characterized in that: described water flow controller (12) is for controlling water flow pressure value scope at 0.1-0.3 MPa, and the spray cycle simultaneously controlling current is consistent with the cycle of laser-impact.
4. the method utilizing the light inner water-supply of the laser impact intensified device of light inner water-supply as claimed in claim 1 laser impact intensified, it is characterized in that: current spray to workpiece by the shower nozzle in the hollow laser bundle that is arranged on circular laser beam and formed after light chopper and bottom the water main coaxial with hollow laser bundle along whole circumference and form the uniform water constraint layer of thickness, make described water constraint layer not be subject to the impact of workpiece surface appearance and surface quality, specifically comprise the following steps:
Step one, opens laser instrument, by the output pulse energy of laser control device setting laser device, and spot diameter and pulse width;
Step 2, is converted to hollow laser bundle by optical path changer by circular laser beam, and coaxially and do not interfere with water main, the internal diameter of hollow laser bundle is equal with shower nozzle external diameter for described hollow laser bundle and water main;
Step 3, closes laser instrument, is arranged on the fixture of five axle workbench after surface of the work being coated absorbed layer, then by five axle movable workbench workpiece, makes the distance of its region to be processed and shower nozzle bottom surface be,
lit is the large amount out of bottom surface, shower nozzle top radius ratio bottom face radius;
Step 4, open tank switch, regulate water flow pressure by water flow controller, make workpiece region surface to be processed form stable, thickness and be 1-2 mm and equally distributed water constraint layer, and then set spray cycle, ensure the synchronism of water spray action and laser-impact action;
Step 5, opens laser instrument and starts to carry out laser impact intensified to surface of the work, controls the movement of workpiece and rotation complete strengthening to whole surface of the work by five axle workbench.
5. a light inner water-supply laser shock peening method as claimed in claim 4, is characterized in that: current are taper seat ejection by shower nozzle whole circumferencial direction bottom water pipe, and the drift angle scope of taper seat is 150 °-180 °.
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| CN201310245934.7A CN103302406B (en) | 2013-06-20 | 2013-06-20 | Intra-light water delivery laser shock peening method and device |
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| CN201310245934.7A CN103302406B (en) | 2013-06-20 | 2013-06-20 | Intra-light water delivery laser shock peening method and device |
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| CN103302406A CN103302406A (en) | 2013-09-18 |
| CN103302406B true CN103302406B (en) | 2015-03-11 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103555928B (en) * | 2013-10-10 | 2015-09-02 | 北京航空航天大学 | A kind of vehicle-mounted laser shock peening device |
| CN103526008A (en) * | 2013-10-14 | 2014-01-22 | 江苏大学 | Laser shock wave reinforcing method and apparatus |
| CN103740894A (en) * | 2013-12-31 | 2014-04-23 | 唐山轨道客车有限责任公司 | Laser shock strengthening device and water spray pipe thereof |
| CN104164538B (en) * | 2014-07-16 | 2017-02-22 | 江苏大学 | Laser shock reinforcing method for obtaining large area uniform surface morphology |
| CN108296639B (en) * | 2016-12-30 | 2023-10-24 | 宁波大艾激光科技有限公司 | Follow-up laser shock peening device |
| CN108329054B (en) * | 2018-01-19 | 2021-02-05 | 天津科技大学 | Laser water jet heat treatment method for ceramic material |
| CN111822888B (en) * | 2019-04-22 | 2021-11-16 | 中国科学院沈阳自动化研究所 | Laser processing device for parabolic streamline hole |
| CN112501425B (en) * | 2020-11-27 | 2021-08-27 | 山东大学 | Laser surface strengthening method with inverse Gaussian distribution shock wave intensity |
| CN112935546B (en) * | 2021-03-17 | 2022-09-16 | 中国科学院宁波材料技术与工程研究所 | Laser shock welding device based on direct impact type constraint layer |
| CN113088677B (en) * | 2021-04-08 | 2022-06-28 | 中国航发北京航空材料研究院 | Water confinement layer device of laser shock peening technology and measuring method thereof |
| CN113732514B (en) * | 2021-08-10 | 2023-08-22 | 中国航发常州兰翔机械有限责任公司 | Laser shock strengthening method and system for hyperboloid welding area at bottom of tail nozzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6215097B1 (en) * | 1994-12-22 | 2001-04-10 | General Electric Company | On the fly laser shock peening |
| PL195102B1 (en) * | 1999-07-19 | 2007-08-31 | Univ California | Contour forming of metals by laser peening |
| CN100431768C (en) * | 2005-08-31 | 2008-11-12 | 江苏大学 | Method and device for measuring related parameter of underwater laser shock formation |
| CN100409994C (en) * | 2005-10-14 | 2008-08-13 | 江苏大学 | Method and apparatus for supercharging water constraint layer based on laser impact technology |
| US8330070B2 (en) * | 2006-05-11 | 2012-12-11 | Kabushiki Kaisha Toshiba | Laser shock hardening method and apparatus |
| CN101787528B (en) * | 2010-02-09 | 2012-11-07 | 江苏大学 | Nano coating preparation device based on ultrafast ultrahigh pressure photodynamics effect |
| CN103143593A (en) * | 2011-12-07 | 2013-06-12 | 江苏大学 | Laser shock wave metal plate reshaping method and device |
| CN102901679A (en) * | 2012-09-19 | 2013-01-30 | 上海交通大学 | Laser impact effect based device and method for detecting dynamic hardness of material |
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Inventor after: Luo Kaiyu Inventor after: Jing Xiang Inventor after: Luo Mi Inventor after: Lin Tong Inventor after: Lu Jinzhong Inventor before: Luo Kaiyu Inventor before: Luo Mi Inventor before: Lin Tong Inventor before: Lu Jinzhong |
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