CN112375899A - Rectangular uniform laser pulse shock strengthening and forming system and application method thereof - Google Patents
Rectangular uniform laser pulse shock strengthening and forming system and application method thereof Download PDFInfo
- Publication number
- CN112375899A CN112375899A CN202011178629.7A CN202011178629A CN112375899A CN 112375899 A CN112375899 A CN 112375899A CN 202011178629 A CN202011178629 A CN 202011178629A CN 112375899 A CN112375899 A CN 112375899A
- Authority
- CN
- China
- Prior art keywords
- laser pulse
- laser
- materials
- nanosecond
- rectangular uniform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a rectangular uniform laser pulse shock strengthening and forming system and an application method thereof, wherein the system comprises: a laser generation module configured as a nanosecond laser for outputting nanosecond laser pulses; the external optical shaping module comprises a shaping curved mirror group or a shaping curved combined mirror and is configured to shape the nanosecond laser pulse to form a rectangular uniform nanosecond laser pulse; the sample module comprises a plurality of samples to be subjected to the laser pulse peening technology and materials for forming the samples. The application method is to adopt the system to implement laser pulse shot blasting technology on the sample piece and the material forming the sample piece. The invention solves the problems caused by adopting a circular laser spot in the prior art and the problems that the prior square pulse laser in China has low output laser pulse energy and is not suitable for the laser pulse shot blasting technology.
Description
Technical Field
The invention relates to the technical field of laser pulse shot blasting and beam shaping homogenization, in particular to a rectangular uniform laser pulse shock strengthening and forming system and an application method thereof.
Background
Laser pulse shock peening and forming (LSP) technology (also known as laser pulse peening technology) is an advanced material surface peening technology. The mechanism is as follows: the surface of the metal material is irradiated by the short pulse (nanosecond) strong laser to generate high-pressure shock waves, so that the residual compressive stress and the change of the microstructure in the material are induced, and a deeper induced residual compressive stress layer than the traditional mechanical shot blasting is formed.
However, most of the laser pulse impact technologies in China currently adopt circular laser spots, gaps among the spots are avoided by adjusting the spot overlapping rate, and the main problems include that: the low overlapping rate can cause an unprocessed area, the high overlapping rate can cause over-processing, the factors are finally reflected on the mechanical performance of the plate, the residual stress distribution of the formed workpiece is uneven, the surface is rough, and simultaneously, the problem of residual stress holes is also generated, the application of the laser pulse shot blasting technology in the aspect of high-end technology industry in China is influenced, and the laser pulse shot blasting technology is bound to the development of the laser pulse shot blasting technology.
In addition, the laser pulse energy output by the existing square laser in China is low, and the laser pulse peening technology with high energy requirement is difficult to be applied.
Therefore, it is necessary to provide a rectangular uniform laser pulse shock peening and forming system and an application method thereof to solve the problems caused by the adoption of a circular laser spot in the prior art and the problems that the energy of laser pulses output by the domestic existing square pulse laser is low and the square pulse laser is not suitable for the laser pulse peening technology.
Disclosure of Invention
The invention aims to provide a rectangular uniform laser pulse shock strengthening and forming system and an application method thereof, which aim to solve the problems caused by the adoption of a circular laser spot in the prior art and the problems that the prior square pulse laser in China has low output laser pulse energy and is not suitable for a laser pulse peening technology.
In order to solve the problems in the prior art, the invention provides a rectangular uniform laser pulse shock strengthening and forming system, which comprises:
a laser generation module configured as a nanosecond laser for outputting nanosecond laser pulses;
the external optical shaping module comprises a shaping curved mirror group or a shaping curved combined mirror and is configured to shape the nanosecond laser pulse to form a rectangular uniform nanosecond laser pulse;
the sample module comprises a plurality of samples to be subjected to the laser pulse peening technology and materials for forming the samples.
Optionally, the rectangular uniform laser pulse shock peening andin the molding system, the shaping curved mirror group or the shaping curved combined mirror is prepared by adopting an optical material with a high optical damage threshold, and the energy density of the optical material with the high optical damage threshold, which can bear nanosecond laser pulses, is not lower than 1J/cm2。
Optionally, in the rectangular uniform laser pulse shock peening and forming system, the external optical shaping module is suitable for nanosecond laser pulses with various repetition frequency sizes and various energy heights.
Optionally, in the rectangular uniform laser pulse shock peening and forming system, the nanosecond laser pulses with various repetition frequencies and various energy levels include:
nanosecond laser pulses of high repetition rate and high energy;
nanosecond laser pulses of low repetition frequency and low energy;
wherein, the range of the high pulse repetition frequency is 5-10Hz, and the range of the low pulse repetition frequency is more than 0Hz and less than 5 Hz; the range of low-energy laser power is MW/cm2The range of magnitude and high-energy laser power is GW/cm2Magnitude.
Optionally, in the rectangular uniform laser pulse shock peening and forming system, the laser generation module generates gaussian, gaussian-like or flat-top beam type pulses;
gaussian, gaussian-like or flat-topped beam type pulses are circular nanosecond laser pulses.
The invention also provides an application method of the rectangular uniform laser pulse shock peening and forming system, and the rectangular uniform laser pulse shock peening and forming system is adopted to implement a laser pulse shot blasting technology on the sample piece and the material forming the sample piece.
Optionally, in the application method of the rectangular uniform laser pulse shock peening and molding system, the material for forming the sample piece includes, but is not limited to, a metal material, a non-metal material, and an organic material; wherein the metal material includes, but is not limited to, aluminum material, aluminum alloy material, steel alloy material, iron alloy material, titanium alloy material, magnesium material, and magnesium alloy material; non-metallic materials include, but are not limited to, ceramics and silicon based.
Optionally, in the application method of the rectangular uniform laser pulse shock peening and forming system, the aluminum alloy material includes an aircraft aluminum material.
Optionally, in the method for applying the rectangular uniform laser pulse shock peening and forming system, the system is applied to manufacturing and maintenance of civil and military aircrafts, ships, power generation devices and nuclear industry equipment in the aviation field.
Optionally, in the method for using the rectangular uniform laser pulse shock peening and forming system, the system is used for strengthening and forming a sample piece and a material forming the sample piece, including but not limited to strengthening of a blade and strengthening of a welding seam.
Compared with the prior art, the invention has the following advantages:
(1) the nanosecond laser pulse output by the nanosecond laser is a high-energy nanosecond laser pulse;
(2) the external optical shaping module shapes and homogenizes the output nanosecond laser pulse to realize various shapes including square, rectangular, linear and the like, so that the laser pulse with uniformly distributed laser energy is formed, the uniformity is greater than 90%, and the external optical shaping module is suitable for laser pulse shot blasting impact treatment of complicated and diversified samples in different research fields.
(3) Laser pulse impact can be performed on a sample piece with a complex structure such as a groove and a corner and a material forming the sample piece.
(4) The direction of laser pulse impact can be vertical and can be obliquely incident on the surface of the material for impacting the sample piece and forming the sample piece.
(5) The laser pulse impact does not produce secondary processing defects.
(6) The covering mode of laser pulse shot blasting is formed by simply overlapping rectangular pulse marks, so that no residual stress hole is realized.
(7) The pulse energy can be precisely controlled, and the method has high accuracy and repeatability.
(8) Can output nanosecond laser pulse with high repetition frequency and high energy, thereby being applied to many fields of laser pulse peening technology.
Drawings
FIG. 1 is a schematic diagram of a laser pulse peening technique according to an embodiment of the present invention;
fig. 2 is a block diagram of a system according to an embodiment of the present invention.
Wherein, 1-laser generation module; 2-external optical shaping module; and 3, a sample module.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Hereinafter, if the method described herein comprises a series of steps, the order of such steps presented herein is not necessarily the only order in which such steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.
In the prior art, circular laser spots are mostly adopted in the laser pulse impact technology in China at present, gaps among the spots are avoided by adjusting the spot overlapping rate, and the problems that residual stress of a formed workpiece is uneven in distribution and rough in surface and residual stress holes are easy to generate exist. In addition, the laser pulse energy output by the existing square laser in China is low, and the laser pulse peening technology with high energy requirement is difficult to be applied.
It is therefore necessary to provide a rectangular uniform laser pulse shock peening and forming system, as shown in fig. 1 and 2, fig. 1 is a schematic diagram of a laser pulse peening technique implemented according to an embodiment of the present invention; fig. 2 is a block diagram of a system according to an embodiment of the present invention, where the system includes:
a laser generation block 1 configured as a nanosecond laser for outputting nanosecond laser pulses, which may be an Nd: a YAG laser;
the external optical shaping module 2 comprises a shaping curved mirror group or a shaping curved combined mirror and is configured to shape the nanosecond laser pulse to form a rectangular uniform nanosecond laser pulse; the external optical shaping module 2 can be an independent rectangular homogenizing shaping subsystem;
the sample module 3 comprises a plurality of samples to be subjected to the laser pulse peening technology and materials for forming the samples.
The invention utilizes the rectangular uniform nanosecond laser pulse to carry out laser pulse impact processing, has simple boundary butt joint, avoids the problems of uneven distribution of residual stress, rough surface and the like, simultaneously overcomes the defect of residual stress holes on the surface of the sample piece caused in the process of circular facula impact processing, and improves the safety and reliability of laser pulse impact and the fatigue life of the sample piece.
Furthermore, the shaping curved mirror group or the shaping curved combined mirror is prepared by adopting an optical material with a high optical damage threshold, and the energy density of the optical material with the high optical damage threshold, which can bear nanosecond laser pulses, is not lower than 1J/cm2Preferably, the optical material with high optical damage threshold can bear nanosecond laser pulse and has energy density of 10J/cm2To accommodate nanosecond laser pulses of higher repetition rate and higher energy.
Preferably, the external optical shaping module is suitable for nanosecond laser pulses with various repetition frequencies and various energy levels. The nanosecond laser pulse with various repetition frequency sizes and various energy levels comprises the following components: nanosecond laser pulses of high repetition rate and high energy; nanosecond laser pulses of low repetition frequency and low energy; wherein, the range of the high pulse repetition frequency is 5-10Hz, and the range of the low pulse repetition frequency is more than 0Hz and less than 5 Hz; the range of low-energy laser power is MW/cm2The range of magnitude and high-energy laser power is GW/cm2Magnitude.
The external optical shaping module has the advantages of high energy utilization rate, high optical damage threshold, relatively simple optical system and the like, and is suitable for the homogenization shaping of high-power nanosecond laser pulses. The laser pulse peening impact treatment device can be insensitive to the pulse space distribution distortion, can realize the homogenization shaping of laser pulses in various shapes including square, rectangular, linear and the like, is suitable for the laser pulse peening impact treatment of complicated and diversified samples in different research fields, and realizes the application of the laser pulse peening technology in various related research fields.
Generally, in the rectangular uniform laser pulse shock peening and forming system, a laser generation module generates a gaussian, gaussian-like or flat-top beam type pulse; gaussian, gaussian-like or flat-topped beam type pulses are circular nanosecond laser pulses. And after the laser generation module emits nanosecond laser pulses, the external optical shaping module shapes and homogenizes the nanosecond laser pulses.
In the invention, the external optical shaping module is positioned outside the laser generating module, so that the rectangular uniform laser pulse shock strengthening and forming system can generate nanosecond laser pulses with high repetition frequency and high energy, and the external optical shaping module can shape and homogenize the nanosecond laser pulses with high repetition frequency and high energy by adopting the optical material with high optical damage threshold.
In addition, the rectangular uniform laser pulse shock peening and forming technology can safely and effectively eliminate the residual tensile stress at the crack, simultaneously changes the stress state of the tip of the crack, and the compressive stress formed by laser pulse peening can prevent the crack from forming and expanding; the increase of the dislocation density increases the resistance to dislocation movement, increases the resistance to fatigue crack formation, and delays the time, thereby extending the fatigue life of the sample.
More than 40% of faults of the aeroengine are caused by fatigue fracture of parts, the fatigue strength of critical parts (taking blades as an example) of the aeroengine can be improved by more than 15% by using the rectangular uniform laser pulse shock strengthening and forming system, and the service life is prolonged by more than 80%; the processing cost is less than 10% of that of the new product, the energy is saved by more than 95%, and the economic value and the social benefit potential are huge.
Further, the invention is different from a U.S. rectangular uniform laser pulse shot blasting system, and utilizes a current domestic mature Nd: YAG laser to output high-energy Gaussian or Gaussian-like circular light spots, and then the rectangular pulses with uniform light spot intensity are obtained through an external optical shaping module. Compared with a laser directly generating square light spots, the cost of the method is much lower, the technical difficulty is low, light spots of different shapes with various sizes can be realized by replacing the optical element in the laser, the laser does not need to be operated, and the method is more flexible and changeful. The energy uniformity of the rectangular light spot is more than 90%, and the requirement of a laser pulse shot blasting technology on the quality of a pulse light beam is met.
The invention also provides an application method of the rectangular uniform laser pulse shock peening and forming system, and the rectangular uniform laser pulse shock peening and forming system is adopted to implement a laser pulse shot blasting technology on the sample piece and the material forming the sample piece.
Preferably, the material forming the sample piece includes but is not limited to metal material, non-metal material and organic material; wherein the metal material includes, but is not limited to, aluminum material, aluminum alloy material, steel alloy material, iron alloy material, titanium alloy material, magnesium material, and magnesium alloy material; non-metallic materials include, but are not limited to, ceramics and silicon based.
Further, the aluminum alloy material includes an aircraft aluminum material.
Preferably, in the method for operating the rectangular homogeneous laser pulse shock peening and forming system, the system is used for manufacturing and maintaining equipment of civil and military aircrafts, manufacturing and maintaining equipment of ships and warships, manufacturing and maintaining equipment of power generation devices and manufacturing and maintaining equipment of nuclear industry in the aviation field, wherein the manufacturing and maintaining of the equipment is mainly manufacturing and maintaining of key parts in the equipment. Further, the system is applicable to the reinforcement and forming of the sample piece and the material forming the sample piece in the aforementioned field, including but not limited to the reinforcement of the blade and the reinforcement of the welding seam. Preferably, the invention can also be applied to the laser crystallization of organic/inorganic mixed perovskite thin film materials and the laser pulse shot blasting imprint preparation of metal nano arrays.
Preferably, when the sample piece and the material forming the sample piece are subjected to a laser pulse peening technology, the sample piece and the material forming the sample piece are fixed on an optical multi-dimensional moving table or a manipulator by a clamp and can move flexibly in multiple dimensions; for large sample pieces which are not easy to move and materials for forming the sample pieces, the external optical shaping module can be additionally provided with optical elements according to needs, so that the rectangular pulses move on the surface of the large sample pieces or the materials for forming the large sample pieces, and the laser pulse shot blasting technology is completed.
In one embodiment, when the nanosecond laser pulse impacts the sample piece, the absorption layer and the confinement layer are arranged on the surface of the sample piece, and the pressure generated by plasma explosion induced by the nanosecond laser pulse is limited by the confinement layer, so that the absorption layer and the sample piece can better absorb laser, and the depth of the residual pressure stress layer of the sample piece can be increased.
Compared with the prior art, the invention has the following advantages:
(1) the nanosecond laser pulse output by the nanosecond laser is a high-energy nanosecond laser pulse;
(2) the external optical shaping module shapes and homogenizes the output nanosecond laser pulse to realize various shapes including square, rectangular, linear and the like, so that the laser pulse with uniformly distributed laser energy is formed, the uniformity is greater than 90%, and the external optical shaping module is suitable for laser pulse shot blasting impact treatment of complicated and diversified samples in different research fields.
(3) Laser pulse impact can be performed on a sample piece with a complex structure such as a groove and a corner and a material forming the sample piece.
(4) The direction of laser pulse impact can be vertical and can be obliquely incident on the surface of the material for impacting the sample piece and forming the sample piece.
(5) The laser pulse impact does not produce secondary processing defects.
(6) The covering mode of laser pulse shot blasting is formed by simply overlapping rectangular pulse marks, so that no residual stress hole is realized.
(7) The pulse energy can be precisely controlled, and the method has high accuracy and repeatability.
(8) Can output nanosecond laser pulse with high repetition frequency and high energy, thereby being applied to many fields of laser pulse peening technology.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011178629.7A CN112375899A (en) | 2020-10-29 | 2020-10-29 | Rectangular uniform laser pulse shock strengthening and forming system and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011178629.7A CN112375899A (en) | 2020-10-29 | 2020-10-29 | Rectangular uniform laser pulse shock strengthening and forming system and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112375899A true CN112375899A (en) | 2021-02-19 |
Family
ID=74576370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011178629.7A Pending CN112375899A (en) | 2020-10-29 | 2020-10-29 | Rectangular uniform laser pulse shock strengthening and forming system and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112375899A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247992A (en) * | 2021-12-14 | 2022-03-29 | 武汉大学 | Laser hot stamping welding method |
| CN114985938A (en) * | 2022-06-08 | 2022-09-02 | 江苏大学 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser shot blasting |
| CN115805367A (en) * | 2021-09-14 | 2023-03-17 | 武汉大学 | Metal nanowire impact welding device and method based on laser thermal coupling effect |
| US11839934B1 (en) | 2022-06-08 | 2023-12-12 | Jiangsu University | Method for preparing super-hydrophobic aluminum alloy surface through flat-topped laser peening |
-
2020
- 2020-10-29 CN CN202011178629.7A patent/CN112375899A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 胡太友等: "激光冲击强化设备的开发", 《光电工程》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805367A (en) * | 2021-09-14 | 2023-03-17 | 武汉大学 | Metal nanowire impact welding device and method based on laser thermal coupling effect |
| CN114247992A (en) * | 2021-12-14 | 2022-03-29 | 武汉大学 | Laser hot stamping welding method |
| CN114985938A (en) * | 2022-06-08 | 2022-09-02 | 江苏大学 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser shot blasting |
| CN114985938B (en) * | 2022-06-08 | 2023-01-17 | 江苏大学 | A method for preparing superhydrophobic surface of aluminum alloy by flat-top laser peening |
| US11839934B1 (en) | 2022-06-08 | 2023-12-12 | Jiangsu University | Method for preparing super-hydrophobic aluminum alloy surface through flat-topped laser peening |
| WO2023236314A1 (en) * | 2022-06-08 | 2023-12-14 | 江苏大学 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser peening |
| GB2623639A (en) * | 2022-06-08 | 2024-04-24 | Univ Jiangsu | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser peening |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112375899A (en) | Rectangular uniform laser pulse shock strengthening and forming system and application method thereof | |
| US6805970B2 (en) | Laser peening of components of thin cross-section | |
| CN100391682C (en) | A Hole Forming Method Based on Laser Shock Wave Technology | |
| Chen et al. | Investigation of microstructures and residual stresses in laser peened Incoloy 800H weldments | |
| CN103849757B (en) | A kind of metal surface treating apparatus based on induced with laser cavitation and method | |
| CN104862468B (en) | Method for prolonging service life of turbine blade based on laser double-faced impact technique | |
| US11103956B2 (en) | Double-side synchronous laser shock peening method for leading edge of turbine blade | |
| CN101275177A (en) | A controlled laser shot peening method and device for anti-fatigue manufacturing | |
| Zhang et al. | Influence of multi-beam preheating temperature and stress on the buckling distortion in electron beam welding | |
| CN102199690A (en) | Laser plasma shock wave surface nanocrystallization method for polycrystal metal material | |
| CN101745740A (en) | Metal plate material ring-shaped light spot laser impact forming method and device | |
| CN1695873A (en) | Method and device for laser shot peening forming of medium-thick plate | |
| Bogue | Lasers in manufacturing: a review of technologies and applications | |
| CN112981089A (en) | Multi-laser cooperative auxiliary laser shock peening method and device | |
| Sagisaka et al. | Thin-sheet-metal bending by laser peen forming with femtosecond laser | |
| CN101239432A (en) | Alloy Surface Micro-crack Arrest Method and Device | |
| CN101705341A (en) | Impact reinforcing method and device based on laser beam array | |
| JP2006122969A (en) | Laser peening treatment of welded joints and castings of metal and metal clad materials | |
| Zhang et al. | Effects of laser shock processing on mechanical properties of laser welded ANSI 304 stainless steel joint | |
| Onozuka et al. | Manufacturing and maintenance technologies developed for a thick-wall structure of the ITER vacuum vessel | |
| CN117696925A (en) | Additive manufacturing device and method capable of increasing metal toughness | |
| Hua et al. | Laser shock forming of aluminum sheet: Finite element analysis and experimental study | |
| CN113462883B (en) | Auxiliary laser shock peening method for heat source of large structural part | |
| CN113732513B (en) | Method and device for surface laser pretreatment of resin-based composite material | |
| CN117226272A (en) | Composite marking method for metal parts of aeroengine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |