CN203700450U - Laser shock peening device for surface of workpiece - Google Patents
Laser shock peening device for surface of workpiece Download PDFInfo
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- CN203700450U CN203700450U CN201320684506.XU CN201320684506U CN203700450U CN 203700450 U CN203700450 U CN 203700450U CN 201320684506 U CN201320684506 U CN 201320684506U CN 203700450 U CN203700450 U CN 203700450U
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Abstract
The utility model provides a laser shock peening device for the surface of a workpiece. The device comprises a resonant cavity, wherein a fluid is used as a constrain layer which is constrained in the resonant cavity. When the device is used for laser shock peening treatment, as the resonant cavity exists, shock wave which is originally scattered outward is utilized to form a compound shock wave through reflecting and wave focusing effects of the resonant cavity to be acted on the surface of the workpiece twice or even more, so that the effect of multiple shocks by one pulse is realized, thereby greatly improving the energy utilization ratio. Meanwhile, as the fluid constrain layer is constrained in the resonant cavity in a fixed shape, the problem that in the prior art, the fluid constrain layer is hard to control in thickness and poor in stability is effectively solved. Therefore, the device can be used for improving the laser shock peening effect and reliability and has a good application prospect.
Description
Technical field
The utility model relates to the reiforcing laser impact technology field for workpiece surface, is specifically related to a kind of laser impact intensified device for workpiece surface.
Background technology
Reiforcing laser impact technology is a kind of high pressure shock wave that light laser is produced carries out laser impact intensified processing technology for workpiece surface.At present, reiforcing laser impact technology is widely applied in fields such as aviation, boats and ships, mechanical engineerings, in particular for the antifatigue processing of aircraft engine blade.
The existing laser impact intensified device for workpiece surface comprises laser generating unit, is positioned at the absorption protective layer of workpiece surface, and is positioned at the restraint layer that absorbs protective layer.The function of restraint layer is allow laser energy pass and act on absorption protective layer, and the reactive force simultaneously also will provide plasma expansion as much as possible time improves shockwave coupling efficiency.Generally adopt at present the solid materials such as opticglass as restraint layer both at home and abroad, or employing thickness is about the flexible materialss such as the moisture film of 0.5-1mm as transparent restraint layer.The function that absorbs protective layer is absorbing laser, produces plasma body, has blocking capability simultaneously, avoids the damage to workpiece of laser and plasma body.Generally make at present to paint, flexible tape or certain thickness tinsel etc. are as absorbing protective layer.
This laser impact intensified treating processes is as shown in Figure 1: utilize short pulse (generally within 50 nanoseconds), high power density (GW/cm
2) laser 24 by transparent restraint layer 25, act on the workpiece such as the metal 4 absorption protective layer that surface applies or note is attached 6; After absorbing protective layer 6 absorbing laser energy, gasify rapidly, form dense high temperature, high pressure plasma, after this plasma body continues absorbing laser energy, steep temperature rise expands, and forms shockwave, and shock strength can reach several GPa (10
9pa) magnitude, far above the yield strength of many workpiece materials; This shockwave is through absorbing protective layer 6; act on workpiece surface and to its internal communication; make workpiece surface produce viscous deformation and residual compressive stress field; cause the moulding distortion of skin-material; dislocation desity increases; cause grain refining, stress and hardness raise, thus significantly improve material antifatigue, resistance to wear and corrosion resistance.
For example, US Patent No. 5744781 " method and apparatus of laser-impact processing ", Chinese patent CN102212655B " a kind of laser shock method ", CN1102962C " adopt the laser-impact processing of low energy laser " and CN101831529B " laser impacting treatment reinforcing method for crankshaft fillet " etc. is all to adopt this laser impact intensified process.But, from Fig. 1, can find out significantly that the plasma stock wave forming after the absorption protective layer 6 absorbing laser energy that are applied to workpiece surface only has the only about half of workpiece surface that acts on, all the other half are are outwards scattered and disappeared.That is to say, 50% power loss nearly in existing laser impact intensified process, its capacity usage ratio is very low.Therefore, in order to realize predetermined treatment effect, have to improve laser energy, the laser at present laser impact intensified generally tends to use pulse energy considerably beyond the nanosecond pulse of a joule.But, such laser apparatus fetch long price, meanwhile, because laser system works in ultimate limit state, reliability is on the low side.Therefore, be necessary to improve laser impact intensified energy utilization efficiency, to reduce the energy requirement to laser system, thereby improve treatment effect under the prerequisite that ensures laser reliability.
In addition, for restraint layer, moisture film because its cost is low, flexible, can be recycled and the advantages such as complex-curved suitability is strong are widely used; But, but there are the following problems as restraint layer for moisture film: the water film thickness that (1) is about 0.5-1mm is difficult to stable control in actual operating process, for example, the general nozzle that adopts applies moisture film from the side at present, but the thickness of moisture film easily changes along with the variation of workpiece shape, position, in addition, the shockwave in the course of processing easily causes the breaking of moisture film, sputter, thus the consistence of impact processing and the reliability of light path devices; (2) with respect to solid constraint, the restraint rigidity deficiency of moisture film, therefore the binding effect of shock wave is not good, easily occurs the situations such as rheonomic constraint, finally causes the weakening of Effect of Laser Shock Processing.
With respect to moisture film, the solid kind restraint layers such as glass are better to the binding effect of laser blast wave.But its flexibility of operation is poor, cannot meet the local assault region of shape matching complexity; In addition, glass can be chipping under the effect of plasma body and shockwave, is therefore generally only adapted to single-impact, is difficult to reuse.
The patent No. is that the patent of invention " a kind of flexible lamina for laser-impact processing " of ZL02138338.3 is organic silica gel and the additive that utilizes two kinds of different componentss; proportioning forms restraint layer after being in harmonious proportion and solidifying according to a certain percentage; spray again the pitch-dark energy absorption protective layer of 86-1 type thereon, form the flexible lamina of collection energy absorption protective layer and restraint layer one.Although this flexible lamina can form the flexible lamina of collection energy absorption protective layer and restraint layer one; but its constraint rigidity does not reach the such constraint strength of glass; and there is the potential hidden danger of quality such as bubble; flexible lamina complex manufacturing process, loaded down with trivial details, is unfavorable for its promoting the use of in this area simultaneously.
Utility model content
Technical purpose of the present utility model is the deficiency existing in above-mentioned existing reiforcing laser impact technology, a kind of laser impact intensified device for workpiece surface is provided, utilize this device to carry out workpiece surface laser impact intensified, improve laser impact intensified efficiency and reliability.
The utility model is realized the technical scheme that above-mentioned technical purpose adopts: a kind of laser impact intensified device for workpiece surface, comprise laser generating unit, be positioned at the absorption protective layer of workpiece surface, and be positioned at and absorb the restraint layer of protective layer, the laser that laser generating unit produces acts on absorption protective layer after by restraint layer, absorbs protective layer and forms plasma stock wave and act on workpiece surface; It is characterized in that:
Also comprise the resonator cavity of an end opening, described resonator cavity arranges laser entrance, for the laser input resonator that laser generating unit is produced; Described resonator cavity also arranges fluid intake, and described restraint layer is the fluid injecting by this fluid intake;
The open end-face of described resonator cavity contacts with absorbing protective layer, and described restraint layer is limited in resonator cavity.
Described workpiece refers to be applied to the product in industrial technology field, comprises any product that can produce viscous deformation and residual compressive stress field under laser blast wave effect, as metallic article etc.
Described resonant cavity material is not limit, and generally selects the material possessing compared with HI high impact ripple tolerance level and reflectance, includes but not limited to metal, as SS304 stainless steel, and highdensity tungstenalloy etc., and stupalith etc.
The concrete shape of described resonant cavity internal surface is not limit, and processes according to the shape that can produce the gathering of high-level efficiency shockwave resonance, comprises elliposoidal and paraboloidal etc.
The opening end shape of described resonator cavity is not limit, and can be circle, square, rectangle etc.
Described fluid comprises any gas and liquid that is suitable for luminous energy transmission.Gas includes but not limited to air, nitrogen etc.Fluid includes but not limited to water and solution thereof.
Described absorption protective layer material is not limit, and comprises tinsel, pitch-dark and adhesive tape etc.
The sharp light wavelength that described laser generating unit produces is not limit, and just can use as long as can be used for producing required shockwave in resonator cavity, comprises 10640/1064/800/532/517/355 nanometer etc.
In sum, the laser impact intensified device for workpiece surface that the utility model provides comprises resonator cavity, selects fluid as restraint layer, and this restraint layer is completely or partially limited in resonator cavity.While utilizing this device to carry out laser impact intensified processing, its treating processes as shown in Figure 2.; when working order; laser from laser generating unit acts on absorption protective layer through the fluid in resonator cavity; after absorbing protective layer absorbing laser energy, gasification produces plasma body; after this plasma body continues absorbing laser energy, expansion forms high-intensity sphere shockwave, and the concrete communication process A of this sphere shockwave is as follows:
Communication process A: a part of sphere shock wave is in workpiece and to its internal communication, and another part sphere shockwave 29 is transmitted to resonator cavity internal surface;
The sphere shockwave that is transmitted to resonator cavity internal surface again forms sphere shockwave 28 after this resonator cavity internal surface reflection, repeats above-mentioned communication process A;
So repeatedly communication process A.; due to the existence of resonator cavity; originally outside lost shockwave is utilized; under the reflection and poly-ripple effect of resonator cavity; make the shockwave that a laser pulse brings out can form composite impact ripple; act on workpiece surface to twice or more times, realize the effect that a pulse is repeatedly impacted, greatly improved capacity usage ratio.
Fig. 3 is the comparison of wave shape schematic diagram that in surge waveform that in existing laser impact intensified device, laser pulse brings out and the laser impact intensified device with resonator cavity of the present utility model, laser pulse brings out.That is, in existing laser impact intensified device, owing to there is no resonator cavity, a pulse only produces one and effectively impacts peak, decay subsequently, and the time length of shockwave is shorter, is about the 1-3 of laser pulse width doubly, and its waveform is as shown in Figure 3A.And laser impact intensified device of the present utility model comprises resonator cavity, waveform as shown in Figure 3 B, the shockwave that is directly transmitted to workpiece forms first crest, shockwave away from workpiece forms second crest after resonator cavity reflects, converges, so repeated reflection, form two or effective shockwave more than two, greatly improved capacity usage ratio, thereby improved Effect of Laser Shock Processing.
On the other hand, in laser impact intensified device of the present utility model, select fluid as restraint layer, and this restraint layer is limited in resonator cavity, thereby fluid restraint layer shape is fixed, efficiently solve fluid restraint layer thickness in prior art and be difficult to control, the problem of poor stability.
In order further above-mentioned laser impact intensified device to be optimized, the utility model has also proposed following optimized Measures.
Consider the effect that bubble may be formed and affect again shock peening in shockwave transmitting focusing in resonator cavity forms the process of shockwave again.As preferably, described resonator cavity also arranges fluid outlet, and described fluid injects by fluid intake, flows out by fluid outlet, forms flow state.The measure tool of this optimization has the following advantages:
(1) described fluid is really flowed, utilize on the one hand the mobile minimizing of fluid again to form in the process of shockwave and form bubble, even if form a small amount of bubble in this process on the other hand, flowing of this fluid also can be taken bubble out of resonator cavity rapidly, the stability that keeps laser optical path, is conducive to reduce the negative impact of this bubble impact strengthening effect;
(2), owing to being provided with fluid outlet, can guide and adjust resonator cavity internal pressure, thereby can control the spacing between resonant cavity and workpiece.
Overflow with the junction of resonator cavity absorbing protective layer in order to reduce fluid in resonator cavity, as preferably, resonator cavity arranges seal washer with the junction of absorption protective layer.
In the utility model, the open end-face of resonator cavity contacts with absorbing protective layer, and described contact comprises airtight contact and non-airtight contact.Because restraint layer in the utility model is fluid, in the time that the open end-face of resonator cavity is airtight contact with absorption protective layer, fluid is completely restricted in resonator cavity, without overflowing.But the open end-face of controlling in actual applications, resonator cavity is that the airtight difficulty contacting is larger with absorbing protective layer.In the time that the open end-face of resonator cavity is not airtight contact with absorption protective layer, will there is a small amount of fluid to overflow at this place.But this overflows and does not hinder validity of the present utility model, on the contrary, overflowing of a small amount of fluid contributes to reduce resonant cavity to absorbing the frictional force of protective layer.
Efficiently enter resonator cavity for the ease of laser by laser entrance, as preferably, between laser generation unit and laser entrance, light element is set, so that the laser that laser generation unit produces efficiently enters resonator cavity by laser entrance.The flexible light pipe system that this light element can be made up of reflecting optics can be also optical fiber etc.
During for fear of working order, plasma stock wave and fluid are the scattering and disappearing of laser entrance, and as preferably, laser entrance arranges pad A, high pressure resistant transparent window sheet and pad B.High pressure resistant transparent window sheet is between pad A and pad B, and its material includes but not limited to quartz plate, lens etc.
The treatment process of utilizing the laser impact intensified device of the utility model to carry out intensive treatment to workpiece is as follows:
Step 1, workpiece carry out applying absorption protective layer on surface after clean;
Step 2, by the open end-face of resonator cavity with absorb protective layer contact, in resonator cavity, inject fluid by fluid intake;
The laser that step 3, laser generating unit produce enters resonator cavity through laser entrance, acts on absorption protective layer by fluid, forms shockwave, and the communication process A of this shockwave is as follows:
Part shockwave directly acts on workpiece to be strengthened workpiece, and another part shockwave is transmitted to resonator cavity internal surface, after resonator cavity internal surface reflection, poly-ripple, again forms shockwave, repeats described communication process A;
So repeatedly, close laser generating unit;
Step 4, take off workpiece, the remaining protective layer that absorbs of clean surface.
In described step 1, the method that applies absorption protective layer at workpiece surface includes but not limited to paint, adhesive tape and tinsel.
Laser impact intensified for workpiece surface different zones is carried out, as preferably, in treating processes; resonator cavity open end-face and the contact position that absorbs protective layer are adjusted; that is, after described step 3, carry out one or many following steps 3 ', then carry out step 4:
Step 3 ': the open end-face and the position that contacts that absorbs protective layer, repeating step 3 that change resonator cavity;
Wherein, step 3 ' in, the open end-face that changes resonator cavity is not limit with the mode of the position that contacts that absorbs protective layer.For example, can be by adopting motor system make workpiece and laser impact intensified device produce relative movement, only comprise workpiece movable, only laser impact intensified device moves, or both forms of all moving, to adapt to the workpiece processing requirements of various size.
In order further to strengthen the laser impact intensified efficiency of workpiece, as preferably, adopt two groups of devices the upper and lower surface of workpiece to be carried out simultaneously to the method for intensive treatment, concrete treating processes is as follows:
Step 1, workpiece carry out applying respectively absorption protective layer on upper and lower surface after clean;
Step 2, by the open end-face of two resonator cavitys in two groups of laser impact intensified devices respectively with absorb the upper and lower surface of protective layer contact, then in resonator cavity, inject fluid by fluid intake respectively;
Step 3, the laser that the laser generating unit in two groups of laser impact intensified devices is produced enter resonator cavity through two laser entrances respectively, act on absorption protective layer by fluid, absorb protective layer and form shockwave, and the communication process A of this shockwave is as follows:
Part shockwave directly acts on workpiece to be strengthened workpiece, and another part shockwave is transmitted to resonator cavity internal surface, after resonator cavity internal surface reflection, poly-ripple, again forms shockwave, repeats described communication process A;
So repeatedly, close laser generating unit;
Step 4, take off workpiece, the remaining protective layer that absorbs of clean surface.
In above-mentioned two kinds for the treatment of processs, consider that shockwave transmitting focusing in resonator cavity forms the effect that may form bubble in the process of shockwave and affect again shock peening again, as preferably, resonator cavity also arranges fluid outlet, in described step 2, described fluid injects by fluid intake, flows out by fluid outlet, forms flow state.
Brief description of the drawings
Fig. 1 is existing laser impact intensified treating processes schematic diagram;
Fig. 2 is the laser impact intensified treating processes schematic diagram that utilizes laser impact intensified device of the present utility model to carry out;
Fig. 3 is the surge waveform comparison diagram that in existing laser impact intensified device and laser impact intensified device of the present utility model, laser pulse brings out;
Fig. 4 is the laser impact intensified device schematic diagram taking water as constraint medium in the utility model embodiment 1;
Fig. 5 is the light element that adopts optics to build in the utility model embodiment 1;
Fig. 6 is the light element that adopts Multi-joint light arm in the utility model embodiment 1;
Fig. 7 is the light element that adopts special optical fiber in the utility model embodiment 1;
Fig. 8 impacts three kinds of motor patterns in processing in the utility model embodiment 1;
Fig. 9 is the different shapes schematic diagram of the exit end face of resonator cavity in the utility model embodiment 1;
Figure 10 is the stack track with the shock zone of the resonator cavity of end surface shape shown in Fig. 9;
Figure 11 is the double direction impulse consolidation system schematic diagram adopting in the utility model embodiment 1;
Figure 12 is the laser impact intensified device schematic diagram taking air as constraint medium in the utility model embodiment 2.
Label in accompanying drawing is: 1. flow control valve; 2. water tank; 3. micro pump; 4. workpiece; 5. fluid outlet; 6. absorb protective layer; 7. the second connectivity port; 8. pipeline; 9. computer; 10. laser generating unit; 11. optical transmission units; 12. optical transmission unit joints; 13. laser entrances; 14. plano-convex collimating mirrors; 15. plano-convex condensing lenss; 16. pad A; 17. high pressure resistant glass; 18. pad B; 19. resonator cavitys; 20. deionized waters; 21. first connectivity ports; 22. fluid intakes; 23. seal washers; 24. laser beams; 25. restraint layers; 28. reflected shock waves; 29. incident blast waves; 30. speculums; 31. concavees lens; 32. condenser lenses; 33. closed chamber; 34. joint light-conducting arms; 35. special optical fibers; 36. fixtures; 37. worktable; 38. industrial robots.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model, it is pointed out that the following stated embodiment is intended to be convenient to understanding of the present utility model, and it is not played to any restriction effect.
Embodiment 1:
In the present embodiment, laser impact intensified device as shown in Figure 4, comprises the resonator cavity 19 of laser generating unit 10, one end openings, and the open end-face of this resonator cavity 19 and mutually airtight contact the in surface that absorbs protective layer 6, form " back-off " structure.This resonator cavity 19 also arranges laser entrance 13, fluid intake 22 and fluid outlet 5.
Pending workpiece 4 surfaces are for absorbing protective layer 6, and in the present embodiment, workpiece 4 is metal works, and absorbing protective layer 6 is aluminium foil.Absorbing protective layer 6 surfaces is restraint layer 20.This restraint layer 20, in resonator cavity 19, is the deionized water injecting by fluid intake 22.This deionized water be micro pump 3 by the deionized water in outer tank 2 by pipeline 8 in fluid intake 22 pumps into resonator cavity 19, pump resonator cavity 19 through fluid outlet 5, form the state that circulates.Pipeline 8 is the first connectivity port 21 with the connectivity port of fluid intake 22, and pipeline 8 is the second connectivity port 7 with the connectivity port of fluid outlet 5.Flow control valve test fluid flow is also set.
Efficiently, stably enter resonator cavity 19 for the ease of laser by laser entrance 13, between laser generating unit 10 and laser entrance 13, light element is set, so that the laser that laser generation unit produces efficiently enters resonator cavity by laser entrance.This light element is made up of with plano-convex condensing lens optical transmission unit 11, optical transmission unit joint 12, plano-convex collimating mirror 14.In actual applications, this light element can also adopt other forms, is the light element that adopts optics to build as shown in Figure 5, is the light element that adopts Multi-joint light arm 34 shown in Fig. 6; The light element that adopts special optical fiber 35 as shown in Figure 7.
During for fear of working order plasma stock wave laser entrance 13 places scatter and disappear, the first pad 16, high pressure resistant glass 17 and the second pad 18 are set at laser entrance 13 places.High pressure resistant glass 17 is between the first pad 16 and the second pad 18, and its material can be quartz plate or lens.
In order to strengthen resonator cavity 19 and the stopping property that absorbs protective layer 6 phase-contact surfaces, be provided with seal washer 23 at resonator cavity 19 with the face that absorption protective layer 6 contacts.
Computer 9 is for controlling laser generation 10 and micro pump 3.
The treatment process of utilizing this laser impact intensified device to carry out intensive treatment to workpiece is as follows:
Step (1), workpiece is cleaned, dried with the liquid such as acetone, alcohol, be then coated in metal works 4 surfaces aluminium foil being absorbed to protective layer 6;
Step (2), by the open end-face of resonator cavity 19 with absorb protective layer 6 surface and contact by seal washer 23 is mutually airtight, then start water pump 3 and in fluid intake 22 allows resonator cavity 19, be full of deionized water 20, and by fluid outlet 5, ionized water 20 being flowed, it is 0.2ml/s left and right that adjust flux variable valve 1 makes the flow velocity of deionized water 20;
Step (3), computer 9 are controlled laser generating unit 10 and are opened, this laser generating unit 10 be 532 nano wave lengths, 25 nanosecond pulsewidth, 1-10 joule pulse energy Nd:YAG solid laser generating unit, regulating impulse laser aid 10 parameters, make parameter meet requirement of experiment; Laser beam 13 sends from laser generating unit 10, is sent to optical transmission unit joint 12 through optical transmission unit 11, the plano-convex condensing lens that regulates 12 li of joints 15 Shang Xia distance laser 13 is acted on absorption protective layer 6 by deionized water; Absorbing protective layer 6 absorbing laser energy gasifies rapidly and forms rapidly fine and close High Temperature High Pressure plasma body, after this plasma body continues absorbing laser energy, expansion forms high-intensity sphere shockwave, directly acting on workpiece 4 towards the spherical calotte shockwave of workpiece 4 strengthens workpiece 4, other parts sphere shockwave forms focus reflection ripple after resonator cavity 19 internal surface reflections near the focus of laser 13 as incident wave, again become shockwave and repeat aforementioned process, thereby form composite impact ripple, twice or more times ground shock peening workpiece 4;
Step (4): after laser-impact is complete, under the control of computer 9, close successively laser generating unit 10 and water pump 3, take off workpiece 4, last, remove the workpiece 4 remaining absorption protective layers 6 in surface.
Laser impact intensified for the surperficial different zones of workpiece 4 is carried out, the present embodiment adopts motor system to make workpiece 4 and laser impact intensified device produce relative movement.Specifically can adopt traverser to make workpiece movable (as shown in Figure 8 A), or adopt industrial robot to make laser impact intensified device move (as shown in Figure 8 B), or both all move the form of (as shown in Figure 8 C), to adapt to the workpiece processing requirements of various size.
Concrete treatment process is: in above-mentioned treating processes; resonator cavity 19 open end-faces and the contact position that absorbs protective layer 6 surfaces are adjusted; that is, above-mentioned steps (3) is carried out one or many following steps (3 ') afterwards, then carries out step (4):
Step (3 '): under the effect of motor system, change the open end-face and the position that contacts that absorbs protective layer 6 surfaces, repeating step (3) of resonator cavity 19.
Under the effect of motor system, the shock zone of workpiece surface forms the track of stack.As shown in Fig. 9 and 10, in the time that the exit end face of resonator cavity 19 is different shapes shown in Fig. 9 (circle, square or rectangle), the stack track of the shock zone forming as shown in figure 10.
In order further to strengthen the laser impact intensified efficiency of workpiece 4, can also adopt two groups of laser impact intensified devices in this enforcements the upper and lower surface of this workpiece 4 to be carried out simultaneously to the method for intensive treatment, as shown in figure 11, specifically treating processes is as follows:
Step (1), workpiece 4 is cleaned, dried with the liquid such as acetone, alcohol, then aluminium foil absorption layer is being coated in to metal works 4 surfaces;
Step (2), by the open end-face of two resonator cavitys in two groups of laser impact intensified devices with absorb protective layer contact by seal washer is mutually airtight, then start respectively water pump and in allowing each resonator cavity, be full of deionized water through fluid intake separately, and by fluid outlet, ionized water being circulated, adjust flux variable valve is for regulating the flow velocity of deionized water;
Laser generating unit in step 3, these two groups of devices of computer control is opened, and regulates respectively laser cell parameter, makes it meet requirement of experiment, laser sends through light element and enters resonator cavity from laser generating unit, absorbs on protective layer by acting on after deionized water, absorbing protective layer absorbing laser energy gasifies rapidly and forms rapidly fine and close High Temperature High Pressure plasma body, after this plasma body continues absorbing laser energy, expansion forms high-intensity sphere shockwave, directly acting on workpiece 4 towards the spherical calotte shockwave of workpiece 4 strengthens workpiece 4, other parts sphere shockwave forms focus reflection ripple after resonator cavity internal surface reflection near the focus of laser as incident wave, again become shockwave and repeat aforementioned process, thereby make workpiece upper and lower surface all form composite impact ripple, twice or more times ground shock peening workpiece 4,
Step (4): after laser-impact is complete, under the control of computer, close successively two laser generating unit and water pump, take off workpiece 4, last, the absorption protective layer of removal workpiece 4 upper and lower surface remnants.
Embodiment 2:
In the present embodiment, laser impact intensified device as shown in figure 12, comprises laser generating unit, the resonator cavity of an end opening, and the open end-face of this resonator cavity and non-airtight contact the in surface that absorbs protective layer, form " back-off " structure.This resonator cavity also arranges laser entrance, fluid intake and fluid outlet.
Pending workpiece surface is for absorbing protective layer, and in the present embodiment, workpiece is metal works, and absorption protective layer is aluminium foil.Absorption protective layer is restraint layer.This restraint layer, in resonator cavity, is the gas injecting by fluid intake, such as air, nitrogen etc.This gas be gas pump by the gas in extraneous gas tank in fluid intake pumps into resonator cavity, pump resonator cavity through fluid outlet, make gas form flow state.
Efficiently enter resonator cavity in order to improve laser by laser entrance, between laser generating unit and laser entrance, light element is set, so that the laser that laser generation unit produces efficiently enters resonator cavity by laser entrance.This light element is made up of optical transmission unit, optical transmission unit joint, plano-convex collimating mirror and plano-convex condensing lens.In actual applications, this light element can also adopt other forms.
During for fear of working order plasma stock wave laser entrance scatter and disappear, at laser entrance, the first pad, high pressure resistant glass and the second pad are set.High pressure resistant glass is between the first pad and the second pad, and its material can be quartz plate or lens.
Resonator cavity is unsealed with absorbing protective layer phase-contact surface, therefore will produce a small amount of gas overflowing at this place, and still, this overflows the validity that does not hinder the present embodiment, on the contrary, overflows on a small quantity and contributes to reduce resonant cavity to absorbing the frictional force of protective layer.
Utilize this laser impact intensified device workpiece to be carried out to the treatment process in the treatment process similar embodiment 1 of intensive treatment, do not repeat them here.
Above-described embodiment has been described in detail the technical solution of the utility model; be understood that and the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all any amendments of making within the scope of principle of the present utility model, supplement or similar fashion substitute etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. the laser impact intensified device for workpiece surface, comprise laser generating unit, be positioned at the absorption protective layer of workpiece surface, and be positioned at and absorb the restraint layer of protective layer, the laser that laser generating unit produces acts on absorption protective layer after by restraint layer, absorbs protective layer and forms plasma stock wave and act on workpiece surface; It is characterized in that: also comprise the resonator cavity of an end opening, described resonator cavity arranges laser entrance, for the laser input resonator that laser generating unit is produced; Described resonator cavity also arranges fluid intake, and described restraint layer is the fluid injecting by this fluid intake; The open end-face of described resonator cavity contacts with absorbing protective layer, and described restraint layer is limited in resonator cavity.
2. the laser impact intensified device for workpiece surface as claimed in claim 1, is characterized in that: described fluid is gas or liquid.
3. the laser impact intensified device for workpiece surface as claimed in claim 1, is characterized in that: the opening end of described resonator cavity is circle, square or rectangle.
4. the laser impact intensified device for workpiece surface as claimed in claim 1, is characterized in that: described resonator cavity also arranges fluid outlet, and described fluid injects by fluid intake, flows out by fluid outlet, forms flow state.
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| CN201320684506.XU CN203700450U (en) | 2013-10-31 | 2013-10-31 | Laser shock peening device for surface of workpiece |
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| CN103614541A (en) * | 2013-10-31 | 2014-03-05 | 中国科学院宁波材料技术与工程研究所 | Laser impact strengthening device aiming at workpiece surface and laser impact strengthening processing method |
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- 2013-10-31 CN CN201320684506.XU patent/CN203700450U/en not_active Withdrawn - After Issue
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| CN103614541A (en) * | 2013-10-31 | 2014-03-05 | 中国科学院宁波材料技术与工程研究所 | Laser impact strengthening device aiming at workpiece surface and laser impact strengthening processing method |
| WO2015062457A1 (en) * | 2013-10-31 | 2015-05-07 | 中国科学院宁波材料技术与工程研究所 | Laser shock peening apparatus for surface of workpiece, and laser shock peening method |
| US10876185B2 (en) | 2013-10-31 | 2020-12-29 | Ningbo Institute Of Materials Technology & Engineering, Chinese Academy Of Sciences | Laser shock peening apparatus for surface of workpiece, and laser shock peening method |
| US11203798B2 (en) | 2013-10-31 | 2021-12-21 | Ningbo Institute Of Materials Technology & Engineering, Chinese Academy Of Sciences | Laser shock peening apparatus for surface of workpiece, and laser shock peening method |
| WO2016008198A1 (en) * | 2014-07-16 | 2016-01-21 | 江苏大学 | Laser shock peening method for obtaining large-area uniform surface morphology |
| US10512987B2 (en) | 2014-07-16 | 2019-12-24 | Jiangsu University | Laser shock peening method for obtaining large-area uniform surface morphology |
| CN104792960A (en) * | 2015-03-30 | 2015-07-22 | 江苏大学 | Real-time detection device and method of laser cavitating and strengthening effects based on content measurement of free hydroxyl radicals |
| CN104878190A (en) * | 2015-06-11 | 2015-09-02 | 沈阳理工大学 | Method for restraining initiation and expansion of crack of part based on laser shock peening |
| CN106337110A (en) * | 2015-07-16 | 2017-01-18 | 江苏大学 | Apparatus and method for improving cavitation wear resistance of water pump impeller |
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| CN106119518B (en) * | 2016-08-10 | 2018-01-16 | 江苏大学 | A kind of laser impact intensified circulation water injection system |
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