CN103143621A - Laser digitalization flexible forming method and device - Google Patents
Laser digitalization flexible forming method and device Download PDFInfo
- Publication number
- CN103143621A CN103143621A CN 201110402459 CN201110402459A CN103143621A CN 103143621 A CN103143621 A CN 103143621A CN 201110402459 CN201110402459 CN 201110402459 CN 201110402459 A CN201110402459 A CN 201110402459A CN 103143621 A CN103143621 A CN 103143621A
- Authority
- CN
- China
- Prior art keywords
- laser
- stress
- forming
- parameter
- digitalization
- 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
Landscapes
- Laser Beam Processing (AREA)
Abstract
The invention relates to a laser digitalization flexible forming method, which is characterized in that a forming plate is designed in a digitalization way, the plate is divided into a plurality of functional areas, stress distribution is generated by a stress excitation device, and the formation is conducted by designing a stress distribution form and releasing the stress. The invention relates to a laser digitalization flexible forming device, which consists of a laser, a control arm and a control system; a laser beam which is launched by the laser is transmitted onto the surface of a workpiece through light guide fibers, a mechanical arm is used for controlling the position, the position of a restraint layer system is also controlled through the mechanical arm, water is sprayed onto a light spot radiation position on the surface of the workpiece to form a restraint layer, and the needed stress distribution can be formed in different functional areas by controlling the laser intensity, light spots and a superimposition rate. The laser digitalization flexible forming method and device can be used for conducting the digitalized formation design and formation machining of a large-sized component. The forming method has the characteristics of high precision, small heat influence and noncontact and can be used for conducting the large-curvature formation of the plate.
Description
Technical field
The present invention relates to mechanical manufacturing field, particularly a kind of laser-impact that utilizes is realized laser digitizing flexible forming method and device that stress distribution forms, is applicable to the shaping of metal blank, and the Da Qu that is specially adapted to large-sized structural parts leads precision form.
Background technology
In the processing and use procedure of metal blank part, ubiquity the problem on deformation that the interaction because of factors such as the geometry of material character, blank initial stress state, processing technology, part and service conditions produces.Because the research of Deformation control is at the early-stage, within also the very difficult accuracy of manufacture with all workpiece all is controlled at the design accuracy scope in a short time.Sheet metal deformation is become direct problem both at home and abroad, the investigative technique research that especially large thickness, high accuracy plate are shaped is less.
The manufacturing process of metal current plate mainly contains hot forming, season stress is shaped and pressure forming.Modal is hot forming and pressure forming, and the hot forming shortcoming is that the part tissue is had heat affecting, and pressure forming contacts with surface of the work, and precision is difficult to control.
The shot peen forming method can adopt the sheet material of solution heat-treated condition to process, and it is good to the adaptability of part geometry change in size.The hyperbolicity that is suitable for big-and-middle-sized structural member is shaped.
Sphere or hyperbolic type facial disfigurement trend is the large distinguishing feature during the metal sheet contour peening normally.But, actual shot-peening plate profile, as Integral Wing Panel covering etc. often take ruled surface as main or most of zone as ruled surface, require when this class plate of contour peening, limit sphere or the hyperboloid deformation tendency of its shot-peening profile, only produce single or take single as main outer mold surface.
For this reason, the foreign scholar has proposed along Integral Wing Panel covering constant percentage chord line, and a fillet, a fillet ground is the method for contour peening one by one.The method crater is concentrated and is distributed on the shot-peening band of line centered by constant percentage chord line, only have very sparse crater or almost there is no the crater in spacer region between adjacent two shot-peening bands (two shot-peening band between non-shot-peening ribbon area), even can make on interval region not by projectile impact by technological measure.The shot-peening distortion mainly concentrates on the shot-peening band, only has very little even not distortion on spacer region.Due to the existence of spacer region, limited to a great extent wallboard along the distortion of the shot-peening on the constant percentage chord line direction, thereby limited sphere or the hyperbolic type facial disfigurement trend of wallboard when contour peening.The advantages such as that the method has is easy and simple to handle, use flexibly, effect is controlled abroad as a kind of effective process means that reduces or limit shot-peening profile sphere or hyperbolic type facial disfigurement trend, are used to the shaping of the plates such as large-scale Integral Wing Panel covering.
But due to the metal residual problem of the metal bullet of mechanic shot peening, namely the accurate control ratio in shot-peening district is more difficult, solves so need to work out corresponding method.
Summary of the invention
In order to solve a difficult problem of carrying out the small curve precision form for large-sized structural parts, the theory that the present invention is shaped according to stress, with induced with laser stress for answering force generating apparatus, a kind of laser digitizing flexible forming method and device are provided, especially for method and the device of the precision form of large-sized structural parts, the shaping of convex surface and two kinds of situation precisions of concave surface can be realized, traditional shot peen forming metal bullet can be solved in the residue problem of surface of the work.
To achieve these goals, the present invention is by the following technical solutions:
A kind of laser digitizing flexible forming method is characterized in that, concrete steps are:
A) laser strip shock zone is seen as the zone of initial stress effect, action effect is by the width that loads the zone, three parameters of stress intensity and the stress degree of depth determine, wherein the width of stress area can represent with spot diameter, the degree of depth that can suppose stress in the model loading procedure is constant, the size that represents practical laser blastic deformation amount by the stress value size variation, adopt the Static Analysis Method of equivalent initial stress load, the equivalence of laser-impact technological parameter is become the size of initial stress load, set up the FEM model of analyzing laser-impact effect deflection, can analyze the laser problem on deformation of plate, and by test, model is verified, for the calculating of forming parameters lays the foundation,
B) by emulation mode set up equivalent stress and the distortion between relation, make equivalent stress corresponding one by one with deflection;
C) set up by test and concern storehouse, i.e. one-to-one relationship between laser parameter and deflection between test parameters and distortion;
D) and then obtain contacting of test parameters and equivalent stress;
E) in limited institute model, take equivalent stress as variable, school shape amount is for calculating target, and optimization is calculated equivalent stress and the best shock zone that needs that be shaped and distributed;
F) corresponding relation according to equivalent stress and technological parameter can obtain forming parameters, according to forming parameters and hot spot distribution path, laser parameter and two-dimensional movement workbench parameter is set, and corrects shape.
G) according to forming parameters and hot spot distribution path, the moving parameter of laser parameter and control arm is set, form.
As the preferred technical solution of the present invention, described pulse laser forming energy density is at 1GW/cm
2Above
A kind of laser digitizing flexible forming apparatus, described device comprises workpiece, control arm, water pipe, optical fiber, laser instrument, computer, laser beam, water constraint layer and fixture; Described workpiece is by the fixture clamping, described laser instrument gives off laser beam and arrives surface of the work by optical fiber, the sensing of water jet is parallel to laser head, described water pipe connects water jet, water vertically flows to surface of the work, and at the regional water constraint layer that forms thickness 6-8mm of surface of the work laser-impact, described computer communication port controlling is controlled the movement of arm processed, and control arm drives the movement of water jet and laser beam.
Preferably, described laser instrument is short-pulse laser, pulsewidth 1-50ns.
The beneficial effect that the present invention brings is:
1, forming accuracy is high: single laser impact, the residual stress zone of formation is very small, almost can not produce macroscopic deformation, only has by a large amount of laser-impacts to form shock zone, forms macroscopic deformation.So by quantity and the impact position of control impuls, can point-device control shaping form.
2, can realize two-way shaping: laser impact forming can be realized the two-way shaping of convex surface and concave surface by controlling the energy density of laser beam, namely can " draw " again and can " press ".
3, noncontact is shaped: in Laser Shock Forming Process, only have the laser radiation force ripple with the surface of the work effect, belong to noncontact and be shaped, without any residual, the post processing work after shaping is simple.
4, can form difficult moulding material: laser-impact can be suitable for the shaping of multiple material, and is applied widely.
The accompanying drawing summary
Fig. 1 is the method for the invention frame diagram
Fig. 2 is laser-impact precision form shape device schematic diagram
Fig. 3 is the schematic diagram in laser action zone
Fig. 4 is laser-impact plate impact district design diagram
Fig. 5 is the shaping schematic diagram of the dull and stereotyped hyperbolicity bending of laser-impact
Number in the figure is:
1-workpiece 2-control arm 3-water pipe
4-optical fiber 5-laser instrument 6-computer
7-laser beam 8-water constraint layer 9-fixture
10-shock zone 11-plasma.
The specific embodiment
The below is described in detail preferred embodiment of the present invention, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made more explicit defining.
As shown in Figure 1, a kind of laser-impact accurate forming method based on the Forming Theory of stress distribution, utilizes laser-impact as the stress excitation apparatus, proposed based on high-performance laser-impact Precision Forming Technology, it directly utilizes intense pulse laser bcam, and (power density is greater than 1GW/cm
2) the impact surface of the work, make its top layer gasification ionize and form shock wave, effect due to metal blank surface water restraint layer, the shock wave pressure peak value that laser-impact produces surpasses the MATERIALS ' DYNAMIC yield strength, this makes moulding material that obvious plastic deformation occur, the local assault district does not produce obvious plastic deformation and the just macroscopic material of plate distortion, then impacts by pointwise and the distribution acquisition large tracts of land complicated shape of orderly shock zone.
Can be according to the metal blank of different-thickness, the parameters such as choose reasonable laser pulse width, energy, spot size obtain desirable residual compressive stress and distribute, and reach the purpose of Accurate Shaping.
As shown in Figure 2, the laser-impact precision forming device comprises workpiece 1, control arm 2, water pipe 3, optical fiber 4, laser instrument 5, computer 6, light beam 7, water constraint layer 8 and fixture 9.Forming Workpiece 1 is fixing by fixture 9, opens water flow switch, allows flowing water cover the bombardment with laser beams position, and forms stable water constraint layer 8.Radiation is on workpiece 1 surface that the flowing water restraint layer is arranged after the optical fiber conduction for laser beam 7, and the laser-impact surface of the work also forms plasma 11, and they expand and are subjected to the restriction of water constraint layer 8.Like this, plasma 11 is violent to heat up and then heavy explosion, produces the high-amplitude shock wave to Forming Workpiece 1 internal communication, adjusts the laser-impact parameter, and the stress wave that can form predetermined amplitude loads.When the shock wave peak pressure surpasses the metal material dynamic yield strength, material yield, and produce the dynamic plasticity distortion.Thereby plate generation macroscopic deformation reaches the balance of internal stress.Control the movement of laser beam by control arm 2.
Be the schematic diagram in laser action zone as shown in Figure 3, flowing water impacts plate under the laser blast wave effect at workpiece 1 surface formation water constraint layer 8.Water constraint layer 8 has retrained high-temperature plasma 11 and has expanded, and prevents simultaneously the cause thermal damage of laser.
Regional 10 design diagrams of laser-impact plate impact as shown in Figure 4.Forming Workpiece is subdivided into network as shown in the figure.Can calculate the distortion situation of forming face according to analogue system, and adjust.
The shaping schematic diagram of the dull and stereotyped hyperbolicity bending of laser-impact as shown in Figure 5.Impact the design shock zone 10 of plate, carry out the shaping of plate.
More shaping example inconvenience victory is lifted, and the variation of control mode and impulse form all may realize different forming modes, and by the distributed in three dimensions in design stress district, the 3 D complex that can carry out plate is shaped.More shaping example inconvenience victory is lifted, and only illustrates its technical scheme and part example here.
The above; it is only the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (4)
1. a laser digitizing flexible forming method, is characterized in that, concrete steps are:
A) the strip shock zone of pulse laser is seen as the zone of initial stress effect, action effect is by the width that loads the zone, three parameters of stress intensity and the stress degree of depth determine, wherein the width of stress area can represent with spot diameter, the degree of depth that can suppose stress in the model loading procedure is constant, the size that represents practical laser blastic deformation amount by the stress value size variation, adopt the Static Analysis Method of equivalent initial stress load, the impact process parameter equivalent of pulse laser is become the size of initial stress load, set up the FEM model of analyzing laser-impact effect deflection, can analyze the laser problem on deformation of plate, and by test, model is verified, for the calculating of forming parameters lays the foundation,
B) by emulation mode set up equivalent stress and the distortion between relation, make equivalent stress corresponding one by one with deflection;
C) set up by test and concern storehouse, i.e. one-to-one relationship between laser parameter and deflection between test parameters and distortion;
D) and then obtain contacting of test parameters and equivalent stress;
E) in limited institute model, take equivalent stress as variable, school shape amount is for calculating target, and optimization is calculated equivalent stress and the best shock zone that needs that be shaped and distributed;
F) corresponding relation according to equivalent stress and technological parameter can obtain forming parameters, according to forming parameters and hot spot distribution path, laser parameter and two-dimensional movement workbench parameter is set, and corrects shape.
G) according to forming parameters and hot spot distribution path, the moving parameter of laser parameter and control arm is set, form.
2. a kind of laser digitizing flexible forming method according to claim 1, is characterized in that, described pulse laser forming energy density is at 1GW/cm
2Above.
3. a laser digitizing flexible forming apparatus, is characterized in that, described device comprises workpiece, control arm, water pipe, optical fiber, laser instrument, computer, laser beam, water constraint layer and fixture; Described workpiece is by the fixture clamping, described laser instrument gives off laser beam and arrives surface of the work by optical fiber, the sensing of water jet is parallel to laser head, described water pipe connects water jet, water vertically flows to surface of the work, and at the regional water constraint layer that forms thickness 6-8mm of surface of the work laser-impact, described computer communication port controlling is controlled the movement of arm processed, and control arm drives the movement of water jet and laser beam.
4. a kind of laser digitizing flexible forming apparatus according to claim 3, is characterized in that, described laser instrument is short-pulse laser, pulsewidth 1-50ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110402459 CN103143621A (en) | 2011-12-07 | 2011-12-07 | Laser digitalization flexible forming method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110402459 CN103143621A (en) | 2011-12-07 | 2011-12-07 | Laser digitalization flexible forming method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103143621A true CN103143621A (en) | 2013-06-12 |
Family
ID=48542094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110402459 Pending CN103143621A (en) | 2011-12-07 | 2011-12-07 | Laser digitalization flexible forming method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103143621A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103984094A (en) * | 2014-05-22 | 2014-08-13 | 中国科学院光电技术研究所 | Optical system heat performance simulation method |
| CN105033462A (en) * | 2015-08-05 | 2015-11-11 | 上海交通大学 | Method and device for thermal-assisted laser peen forming |
| CN107794365A (en) * | 2017-11-24 | 2018-03-13 | 温州大学 | Laser blast wave flexible machining equipment and its method |
| WO2018082346A1 (en) * | 2016-11-02 | 2018-05-11 | 广东工业大学 | Method and device for correcting the shape of deformed blade by laser peening |
| CN108531714A (en) * | 2018-07-04 | 2018-09-14 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
-
2011
- 2011-12-07 CN CN 201110402459 patent/CN103143621A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103984094A (en) * | 2014-05-22 | 2014-08-13 | 中国科学院光电技术研究所 | Optical system heat performance simulation method |
| CN105033462A (en) * | 2015-08-05 | 2015-11-11 | 上海交通大学 | Method and device for thermal-assisted laser peen forming |
| WO2018082346A1 (en) * | 2016-11-02 | 2018-05-11 | 广东工业大学 | Method and device for correcting the shape of deformed blade by laser peening |
| CN107794365A (en) * | 2017-11-24 | 2018-03-13 | 温州大学 | Laser blast wave flexible machining equipment and its method |
| CN108531714A (en) * | 2018-07-04 | 2018-09-14 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
| CN108531714B (en) * | 2018-07-04 | 2019-05-10 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100355514C (en) | Method and equipment for forming plate of moderate thickness through laser shot blast | |
| CN103143593A (en) | Laser shock wave metal plate reshaping method and device | |
| CN103143621A (en) | Laser digitalization flexible forming method and device | |
| CN101249588B (en) | Sheet material double face precise forming method and apparatus based on laser blast wave effect | |
| CN106141425B (en) | The laser shot forming precision dynamic adaptive controller of robotic gripper sheet metal | |
| CN103805760B (en) | A kind of method utilizing high-pressure water jet to eliminate welding residual stress | |
| CN105033462A (en) | Method and device for thermal-assisted laser peen forming | |
| CN101524784A (en) | Method and device for laser shock forming on the basis of polyurethane rubber film | |
| CN106270005B (en) | A kind of method and apparatus of blade laser peening school shape | |
| CN101275177A (en) | Anti-fatigue controlled laser shot peening method and device therefor | |
| CN103320579B (en) | Aircraft turbine blade laser shock method and device | |
| CN100999038A (en) | Method and device of laser impact sheet metal mouldless shaping based on liquid crystal mask | |
| CN103266204B (en) | Method and device for improving constraint effect of laser high temperature shot blasting | |
| CN102513942A (en) | Supersonic shot-peening forming method for single or double curvature integral panels | |
| CN101804508A (en) | Step type variable speed scanning method for accuracy control of laser bend forming | |
| CN101664873A (en) | Laser-assisted roll bending forming device and method thereof | |
| CN102653031B (en) | Laser drive combined flyer forming method and device thereof | |
| CN102513440A (en) | Method and device for forming magnesium alloy formed parts with excellent high-temperature mechanical property | |
| US20210205930A1 (en) | A double-side synchronous laser shock peening method for leading edge of turbine blade | |
| CN103302399B (en) | A kind of micro-flattening device based on high energy pulse laser stress effect and method thereof | |
| CN103317227A (en) | Laser mask shock forming device based on plasticine mould and method of laser mask shock forming device | |
| CN107419088A (en) | A kind of laser peening shaping methods of Integral Wing Panel part milling unstability | |
| CN103740894A (en) | Laser shock strengthening device and water spray pipe thereof | |
| CN102527813A (en) | Device and method for laser micro shock dieless forming | |
| CN102154539A (en) | Gas type armored plate heating and press-quenching method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130612 |