CN104046769B - In a kind of laser blast wave strengthening, reduce method and the device of surface roughness - Google Patents
In a kind of laser blast wave strengthening, reduce method and the device of surface roughness Download PDFInfo
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- CN104046769B CN104046769B CN201410250736.4A CN201410250736A CN104046769B CN 104046769 B CN104046769 B CN 104046769B CN 201410250736 A CN201410250736 A CN 201410250736A CN 104046769 B CN104046769 B CN 104046769B
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Abstract
The invention discloses the method and the device that in a kind of laser blast wave strengthening, reduce surface roughness, the structure of implementing the method comprises high energy pulse laser, restraint layer, pretightning force, absorbed layer, Elastic Contact film, nick hole and metal works. Its operation principle is that absorbed layer is under high energy pulse laser irradiation, the blast of generation plasma, plasma blast produces high-pressure shocking wave under the effect of contraction of restraint layer, and under this shock wave, Elastic Contact film produces strain, and pending surface of workpiece produces plastic deformation, after shock wave disappears, pending surface of workpiece will form nick hole, and produce high-amplitude residual compressive stress layer, under the effect of pretightning force, Elastic Contact film recoils to original state; In the time overlapping processing, under pretightning force effect, Elastic Contact film produces and blocks effect, and the secondary deformation degree that makes to overlap region significantly reduces and even do not produce secondary deformation, thereby significantly reduces the surface roughness causing due to the secondary plastic deformation in overlap joint region. Employing the present invention can further improve the fatigue behaviour of metal works in laser blast wave strengthening, can be applicable to the intensive treatment of metal surface.
Description
Technical field
The present invention relates to special process field, be specifically related to a kind of laser blast wave reinforcement technique.
Background technology
Laser blast wave strengthening is a kind of novel material surface strengthening technology, can obtain high-amplitude residual compressive stress layer on metallic article surface, and the fatigue life of greatly improving product, compared with conventional blasting technology, its residual compressive stress layer is darker. At the beginning of 21 century, the U.S. is applied to the strengthening of F101, F119 and F414 engine blade by laser impact technology and manufactures.
Laser blast wave strengthening is general adopts circular laser facula to carry out, laser blast wave strengthening is, by strong shock wave, intensive treatment is carried out in metal surface, therefore, can cause on surface moulding distortion, form the nick hole that a degree of depth is several microns, when large-area region being carried out when laser impact intensified, for whole processing region is strengthened, between adjacent spots, must there is certain amount of lap, form certain overlapping region, form secondary plastic deformation in overlap joint region, thereby make surface roughness significantly increase, this has offset to a great extent the fatigue life being caused by residual compressive stress and has improved.
Summary of the invention
The object of the present invention is to provide the method and the device that in a kind of laser blast wave strengthening, reduce surface roughness, while large area region being carried out to laser blast wave strengthening to be reduced in, due to the surface roughness that causes of secondary plastic deformation in overlap joint region, thereby further improve pending metal works fatigue behaviour.
In order to solve above technical problem, the concrete technical scheme that the present invention adopts is as follows:
In a kind of laser blast wave strengthening, reduce the method for surface roughness, it is characterized in that: utilize absorbed layer (4) under high energy pulse laser (1) irradiation, the blast of generation plasma, plasma blast produces high-pressure shocking wave under the effect of contraction of restraint layer (2), under described shock wave, Elastic Contact film (5) produces strain, make pending surface of workpiece produce plastic deformation, after shock wave disappears, pending metal works (7) surface will form nick hole (6), and produce high-amplitude residual compressive stress layer, under the effect of pretightning force (3), Elastic Contact film (5) recoils to original state, in the time overlapping processing, under pretightning force (3) effect, Elastic Contact film (5) produces the effect of blocking, the secondary deformation degree that makes to overlap region (8) significantly reduces and does not even produce secondary deformation, thereby significantly reduce the surface roughness causing due to the secondary plastic deformation in overlap joint region (8).
Described Elastic Contact film (5) is metallic film, and thickness is 50 ~ 150 μ m, and hardness is higher than metal works (7); In strain rate up to 106S-1Situation under, the dynamic yield strength of Elastic Contact film (5) is greater than the Yu Gongniu limit (HEL) of metal works (7); The lower surface of Elastic Contact film (5) is through polishing.
Described its size of pretightning force (3) must ensure in laser blast wave strengthening process, between absorbed layer (4), Elastic Contact film (5) and metal works (7), does not produce relative slippage.
The pulsewidth scope of described high energy pulse laser (1) is 10 ~ 30ns, and power density scope is 109~1010GW/cm2, the surge pressure of the shock wave that high energy pulse laser (1) produces is less than the dynamic yield strength of Elastic Contact film (5), and is greater than the Yu Gongniu limit HEL of metal works (7).
The device of implementing to reduce in described a kind of laser blast wave strengthening the method for surface roughness, is characterized in that: comprise the high energy pulse laser (1), restraint layer (2), pretightning force (3), absorbed layer (4), Elastic Contact film (5) and the metal works (7) that cover successively from top to bottom on the pending surface of metal works (7); Restraint layer (2), absorbed layer (4) and Elastic Contact film (5), absorbed layer (4), Elastic Contact film (5) and metal works (7) fit tightly successively by pretightning force (3).
Operation principle of the present inventionFor: absorbed layer is under high energy pulse laser irradiation, the blast of generation plasma, plasma blast produces high-pressure shocking wave under the effect of contraction of restraint layer, under this shock wave, Elastic Contact film produces strain, and pending surface of workpiece produces plastic deformation, after shock wave disappears, pending surface of workpiece will form nick hole, and produce high-amplitude residual compressive stress layer, and Elastic Contact film recoils to original state, in the time overlapping processing, under pretightning force effect, due to the effect of blocking of Elastic Contact film, the secondary deformation degree in overlap joint region significantly reduces and does not even produce secondary deformation, thereby significantly reduce increasing substantially due to the surface roughness that causes of secondary plastic deformation in overlap joint region.
The beneficial effect that the present invention has. the present invention by placing the surge pressure of an Elastic Contact film and the high-pressure shocking wave that accurately control high energy pulse laser produces between absorbed layer and metal works, ensure that surface of workpiece produces laser blast wave strengthening effect and Elastic Contact film still recoils to original state, under the effect of pretightning force, in the time large area region being carried out to laser blast wave strengthening, the secondary deformation degree in overlap joint region significantly reduces and does not even produce secondary deformation, significantly reduce the surface roughness of laser blast wave strengthening, can further improve the fatigue behaviour of pending metal works, the hardness of Elastic Contact film is higher than pending metal, and its lower surface is through polishing, and under high-pressure shocking wave effect, the rough surface of metal works can obtain polishing to a certain extent.
Brief description of the drawings
Fig. 1 is the method schematic diagram that reduces surface roughness in laser blast wave strengthening of the present invention;
In figure: 1 high energy pulse laser 2 restraint layer 3 pretightning force 4 absorbed layer 5 Elastic Contact film 6 nicks are cheated 7 metal works 8 and overlapped region.
Fig. 2 is laser blast wave strengthening and roughness concentration datum line schematic diagram under overlapping mode of the present invention.
In figure: 9 measuring basis lines.
Detailed description of the invention
For better setting forth implementation detail of the present invention, below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated.
In a kind of laser blast wave strengthening of the present invention, reduce the method for surface roughness as shown in Figure 1, comprise workbench high energy pulse laser 1, restraint layer 2, pretightning force 3, absorbed layer 4, Elastic Contact film 5, nick hole 6, metal works 7 and overlap joint region 8. Restraint layer 2, absorbed layer 4, Elastic Contact film 5 cover on the pending surface of metal works 7 successively. Absorbed layer 4, Elastic Contact film 5 and metal works 7 fit tightly by pretightning force 3, do not produce relative displacement.
In following embodiment, high energy pulse laser 1 pulsewidth is 10ns, and laser spot diameter is 3mm, and power density is 3 × 109GW/cm2, the surge pressure that high energy pulse laser 1 produces is about 2GPa; Restraint layer 2 is mobile deionization moisture film, and its thickness is about 1mm; The material of Elastic Contact film 5 is 60Si2CrVA, its hardness is 700HV, dynamic yield strength is about 2.8GPa; Metal works 7 materials are LY2 aluminium alloy, and its hardness is 130HV, and Yu Gongniu limit HEL is about 1GPa, and initial surface roughness is 1.83 μ m.
Embodiment one
This example has carried out two groups of contrast tests, and first group adopts conventional laser blast wave intensifying method, absorbed layer 4 for thickness be the aluminium foil of 150 μ m; Second group adopts laser blast wave intensifying method of the present invention, absorbed layer 4 for thickness be the aluminium foil of 100 μ m, elastic restraint layer thickness is 50 μ m. Distance in two groups of tests between adjacent laser spot center is 5mm.
Fig. 2 is laser blast wave strengthening and roughness concentration datum line under overlapping mode in this embodiment, records under conventional laser shock wave intensifying method, and the line roughness recording along the measuring basis line of Fig. 2 is 3.27 μ m; Under laser blast wave intensifying method of the present invention, the line roughness recording along the measuring basis line 9 of Fig. 2 is 0.65 μ m, and roughness significantly reduces.
Embodiment two
This example has carried out two groups of contrast tests, and first group adopts conventional laser blast wave intensifying method, absorbed layer 4 for thickness be the aluminium foil of 150 μ m; Second group adopts laser blast wave intensifying method of the present invention, absorbed layer 4 for thickness be the aluminium foil of 100 μ m, elastic restraint layer thickness is 50 μ m. Distance in two groups of tests between adjacent laser spot center is 4.2mm.
2 record under conventional laser shock wave intensifying method, and the line roughness recording along the measuring basis line of Fig. 2 is 4.46 μ m; Under laser blast wave intensifying method of the present invention, the line roughness recording along the measuring basis line 9 of Fig. 2 is 0.89 μ m, and roughness significantly reduces.
Embodiment three
This example has carried out two groups of contrast tests, and first group adopts conventional laser blast wave intensifying method, absorbed layer 4 for thickness be the aluminium foil of 150 μ m; Second group adopts laser blast wave intensifying method of the present invention, absorbed layer 4 for thickness be the aluminium foil of 100 μ m, elastic restraint layer thickness is 50 μ m. Distance in two groups of tests between adjacent laser spot center is 3mm.
Record under conventional laser shock wave intensifying method, the line roughness recording along the measuring basis line of Fig. 2 is 5.62 μ m; Under laser blast wave intensifying method of the present invention, the line roughness recording along the measuring basis line 9 of Fig. 2 is 1.47 μ m, and roughness significantly reduces.
Claims (4)
1. a device that reduces surface roughness in laser blast wave strengthening, is characterized in that: comprise the high energy pulse laser (1), restraint layer (2), pretightning force (3), absorbed layer (4), Elastic Contact film (5) and the metal works (7) that cover successively from top to bottom on the pending surface of metal works (7); Restraint layer (2), absorbed layer (4) and Elastic Contact film (5), absorbed layer (4), Elastic Contact film (5) and metal works (7) fit tightly successively by pretightning force (3).
2. utilize the method that reduces surface roughness device in a kind of laser blast wave strengthening described in claim 1 and carry out reducing in laser blast wave strengthening surface roughness, it is characterized in that: utilize absorbed layer (4) under high energy pulse laser (1) irradiation, the blast of generation plasma, plasma blast produces high-pressure shocking wave under the effect of contraction of restraint layer (2), under described shock wave, Elastic Contact film (5) produces strain, make pending surface of workpiece produce plastic deformation, after shock wave disappears, pending metal works (7) surface will form nick hole (6), and produce high-amplitude residual compressive stress layer, under the effect of pretightning force (3), Elastic Contact film (5) recoils to original state, in the time overlapping processing, under pretightning force (3) effect, Elastic Contact film (5) produces the effect of blocking, the secondary deformation degree that makes to overlap region (8) significantly reduces and does not even produce secondary deformation, thereby significantly reduce the surface roughness causing due to the secondary plastic deformation in overlap joint region (8),
The pulsewidth scope of described high energy pulse laser (1) is 10 ~ 30ns, and power density scope is 109~1010GW/cm2, the surge pressure of the shock wave that high energy pulse laser (1) produces is less than the dynamic yield strength of Elastic Contact film (5), and is greater than the Yu Gongniu limit HEL of metal works (7).
3. the method that reduces surface roughness in a kind of laser blast wave strengthening according to claim 2, is characterized in that: described Elastic Contact film (5) is metallic film, and thickness is 50 ~ 150 μ m, and hardness is higher than metal works (7); In strain rate up to 106s-1Situation under, the dynamic yield strength of Elastic Contact film (5) is greater than the Yu Gongniu limit (HEL) of metal works (7); The lower surface of Elastic Contact film (5) is through polishing.
4. in a kind of laser blast wave strengthening according to claim 2, reduce the method for surface roughness, it is characterized in that: described its size of pretightning force (3) must ensure in laser blast wave strengthening process, between absorbed layer (4), Elastic Contact film (5) and metal works (7), does not produce relative slippage.
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Families Citing this family (13)
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| CN104726688B (en) * | 2015-02-10 | 2017-07-18 | 江苏大学 | A kind of flange internal spherical cage Extrusion Die Design method for considering laser impact effect |
| CN105002349B (en) * | 2015-07-21 | 2017-05-03 | 江苏大学 | Method for conducting variable-light-spot multilayer staggered laser shock homogeneous enhancement on blades |
| CN106119467B (en) * | 2016-07-26 | 2018-06-12 | 广东工业大学 | A kind of method and apparatus for controlling laser peening parameter monitoring blade surface roughness |
| CN106337111B (en) * | 2016-08-29 | 2018-10-09 | 江苏大学 | A kind of surface reinforcing method based on heat radiation and laser impact intensified combination |
| CN106399663B (en) * | 2016-09-12 | 2019-01-08 | 江苏大学 | A kind of deep cooling laser shock peening method and device based on induced with laser high-temperature plasma body technique |
| CN106435158B (en) * | 2016-10-09 | 2017-12-15 | 南通大学 | The workpiece surface laser-impact technique in residual stress hole is removed using the micro- texture in surface |
| CN107570875B (en) * | 2017-10-09 | 2019-06-28 | 江苏大学 | A kind of laser blast wave polishing process of Varying-thickness contact membranes |
| CN107790875B (en) * | 2017-10-09 | 2019-08-02 | 江苏大学 | A kind of gradual laser blast wave polishing method |
| CN108611484A (en) * | 2018-08-08 | 2018-10-02 | 广东工业大学 | A kind of metal blade laser shock peening method free of surface defects without deformation |
| CN109234518B (en) * | 2018-10-22 | 2020-11-03 | 江苏大学 | Method and device for pre-stress laser shock peening of flat plate |
| CN110732780B (en) * | 2019-09-30 | 2021-10-12 | 江苏大学 | Manufacturing method of high-efficiency microtexture based on laser shock wave coupling effect |
| CN110560888B (en) * | 2019-10-23 | 2020-07-10 | 山东大学 | Method for roughening and functionalizing surface of metal material by utilizing laser shock forming technology and application thereof |
| CN113832335A (en) * | 2021-09-25 | 2021-12-24 | 温州大学 | Device and method for strengthening aero-engine blade through laser shock |
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| CN101653802A (en) * | 2009-09-21 | 2010-02-24 | 上海交通大学 | Micro-pit array-processing method based on laser impact effect |
| CN103343190B (en) * | 2013-07-19 | 2014-12-03 | 江苏大学 | Laser shock enhancement device adopting macromolecular restraint layer |
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Effective date of registration: 20180105 Address after: National Park 224400 Funing Yancheng City County in Jiangsu province Yi Town No. 58 Patentee after: Yancheng City tripod Machinery Limited by Share Ltd Address before: 212013 Zhenjiang City, Jiangsu Province University Road, No. 301 Patentee before: Jiangsu University |
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