CN106216445A

CN106216445A - A kind of large thin-wall element laser peening straightening method with complex surface

Info

Publication number: CN106216445A
Application number: CN201610553524.2A
Authority: CN
Inventors: 张永康; 卢轶; 黄志刚
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2016-07-12
Filing date: 2016-07-12
Publication date: 2016-12-14
Anticipated expiration: 2036-07-12
Also published as: CN106216445B

Abstract

Existing straightening technique method is to use the method pressed orthopedic with press, i.e. presses up in the side become large-sized.But utilize press to having the large thin-wall element of complex surface, there is variety of problems time orthopedic: be 1. difficult to avoid undeformed complex surface, introduce secondary deformation；2 orthopedic pressure are difficult to accuracy controlling, easily produce deformation and resilience；Surface after 3 process often has tension, easily becomes new crack initiation point.Present situation based on large thin-wall element orthopedic technology, the present invention proposes a kind of large thin-wall element laser peening straightening method with complex surface, can accurately control the deformation of thin-wall part, the part scrapped because of deformation is corrected for qualified form, and residual compressive stress is applied in orthopedic region, improve the service life of part.

Description

A kind of large thin-wall element laser peening straightening method with complex surface

Technical field

The present invention relates to laser peening orthopedic arts, refer in particular to a kind of large thin-wall element laser peening with complex surface and rectify Shape method, different deformed regions can be analyzed by it, formulates the orthopedic measurement of different laser peenings, thus accurately will Part reverts to original-shape.

Technical background

Along with the development of aeronautical technology, high speed light weight becomes the direction that world today's advanced aircraft is developed.In aircraft Containing substantial amounts of thin-wall part such as casing, the blade etc. with complex surface, large-scale thin-wall titanium alloy foundry goods, its overall size, knot , there is the biggest technology difficulty, although in whole technological process in the configuration formula mode casting to employing precision-investment casting In from wax-pattern operation begin to control casting deformation, but the later stage pour into a mould after casting deformation amount still reach 2.5～3.5mm very To more than 3.5mm, scrappage is high, the most in use owing to bearing alternate load, also has substantial amounts of part and produces Deformation, directly carries out remanufacturing renewal part cost the highest for these parts, and it is carried out orthopedic reparation is cost-effective Requisite measure.

Existing straightening technique method is to use the method pressed orthopedic with press, i.e. presses up in the side become large-sized. But utilize press to having the large thin-wall element of complex surface, time orthopedic, there is variety of problems: be 1. difficult to avoid undeformed multiple Miscellaneous surface, introduces secondary deformation；2 orthopedic pressure are difficult to accuracy controlling, easily produce deformation and resilience；Surface after 3 process Often there is tension, easily become new crack initiation point.

Summary of the invention

Present situation based on large thin-wall element orthopedic technology, the present invention proposes a kind of large thin-wall element with complex surface and swashs Light shot-peening straightening method, it is possible to accurately control the deformation of thin-wall part, being corrected by the part scrapped because of deformation is qualified form, and Apply residual compressive stress in orthopedic region, improve the service life of part.

The principle of the present invention is: after material occurs bending and deformation, when using high power laser impact specimen surface, and can be at material Material surface applies small plastic deformation and residual compressive stress layer, and under the effect of residual compressive stress, material will be along laser light incident Contrary direction projection, forms flexural deformation thus is aligned by material.As shown in Figure 2.

A kind of large thin-wall element laser peening straightening method with complex surface, it is characterised in that: have as shown in Figure 3 The thin-wall part of complex surface, first passes through 3D vision scanning its deformation behaviour of converse works analyzing, generally can be divided into three parts: Simple bending deformation, multi-curvature complex deformation and there is the deformed region of undeformed labyrinth.

Simple bending is deformed, after measuring deformation size, the selected orthopedic region of shot-peening, it is coated with and is covered with absorbed layer peace treaty Bundle layer (as shown in Figure 2), uses rational laser parameter that deformed region is carried out shock treatment.

For multi-curvature complex deformation, as it is shown on figure 3, first analyze Deformation Curvature, closely region complicated for deformation, There is deformation between orthopedic region is overlapped mutually coupling, it is therefore desirable to planned laser peening order and parameter.Deform with Fig. 3 As a example by curve, first processing upper end deformation, laser light incident direction, as it is shown on figure 3, act on the recessed one side of material, makes material Material back-flexing deformation, makes angle deviating benchmark θ.Then lower end deformation is carried out the orthopedic process of laser peening, laser light incident side To with scanning road strength as it is shown on figure 3, when scanning to deformable transition region, the orthopedic beginning of laser peening produces synergistic effect, now Calculate the accumulative effect of every time deformation, accurately calculate laser energy, from entering transition region to leaving transition region, laser energy by The least, progressively compensate the bias θ of orthopedic generation for the first time.Make material recoverable force to original configuration

For having the deformed region of undeformed labyrinth, orthopedic owing to needing near labyrinth to carry out, laser Hot spot to cover not deformed structure unavoidably, now introduces one protection absorbed layer, covers on the surface that need to protect, it is to avoid it is subject to The impact of laser blast wave.

A kind of protection absorbed layer, it is characterised in that: described protection absorbed layer is porous organization, wherein comprises many tetrahedrons Shape metallic particles (as shown in Figure 5), loose structure can have unloading impulse photoinduction shock wave so that it is is difficult to arrive shielded table Face, metallic particles can reflect a part of laser energy, makes laser energy can quickly be absorbed, in not Tongfang at protection absorbed layer Cancel out each other to producing shock wave, weaken the shock wave propagated to protected surface greatly.

It is an advantage of the current invention that:

1. substitute traditional handicraft, it is possible to solve the orthopedic work in surface with multi-curvature complex deformation.

2. protection absorbed layer protects the surface without deformation, makes that the laser of complex surface is orthopedic to be achieved.

3. carry out orthopedic while, introduce in orthopedic region residual compressive stress improve material intensity and use the longevity Life.

4. without particular manufacturing craft, realize orthopedic by accuracy controlling laser parameter, convenient and swift low cost.

Accompanying drawing explanation

The invention will be further described with embodiment below in conjunction with the accompanying drawings.

Fig. 1 has the large thin-wall element structural representation of complex surface and is intended to；

Fig. 2 is the orthopedic schematic diagram of laser peening；

Fig. 3 multi-curvature orthopedic schematic diagram of complex deformation laser；

Fig. 4 has the deformed region schematic diagram of undeformed labyrinth；

Fig. 5 is protection absorbed layer organizational structure schematic diagram；

Fig. 6 shot-peening hot spot overlap joint schematic diagram.

Detailed description of the invention

Following example are used for illustrating the present invention, but are not to limit the present invention.Describe the present invention below in conjunction with the accompanying drawings in detail The details of the method and device proposed and working condition.

There is the thin-wall part 1 of complex surface as shown in Figure 3, first pass through 3D vision its deformation of scanning converse works analyzing Feature, generally can be divided into three parts: simple bending deformation 103, multi-curvature complex deformation 101 and deformed region have not deformed Labyrinth 102.

Specific embodiment 1: 103 are deformed for simple bending, after measuring deformation size, the selected orthopedic region of shot-peening, Painting is covered with absorbed layer 7 and restraint layer 6 (as shown in Figure 2), and laser 5 is with spot diameter as 3mm, with energy 20J, and pulsewidth 15ns, frequently It is orthopedic that the parameter of rate 20Hz carries out shot-peening to deformed region, and shot-peening path is as shown in Figure 6.

Specific embodiment 2: for multi-curvature complex deformation region 101, as it is shown on figure 3, first analyze Deformation Curvature, orthopedic There is deformation between region is overlapped mutually coupling, it is therefore desirable to planned laser peening order and parameter.With Fig. 3 deformation curve As a example by, first upper end deformation being processed, laser 5 incident direction, as it is shown on figure 3, act on the recessed one side of material 01, makes material Expect 01 back-flexing deformation, make angle deviating benchmark 02 θ, forming part skew 03.Then the deformation of material 01 lower end is swashed The orthopedic process of light shot-peening, laser 5 incident direction and scanning road strength are as it is shown on figure 3, work as scanning to deformable transition region 104, laser The orthopedic beginning of shot-peening produces synergistic effect, now calculates the accumulative effect of deformation every time, accurately calculates laser energy, from entrance Transition region 104 is to leaving transition region 104, and laser 5 energy is progressively decremented to 10J from 20J, progressively compensates orthopedic generation for the first time Bias θ.Make material 01 recoverable force to original configuration.

Specific embodiment 3: for having the deformed region 102 of undeformed labyrinth, as shown in Figure 4, due to complexity Needing to carry out orthopedic near structure, laser facula to cover not deformed structure unavoidably, at not deformed body structure surface covering protection Absorbed layer 8, covers on the surface that need to protect, it is to avoid the impact of its Stimulated Light shock wave, remainder is right according to being embodied as 1,2 Situation about answering carries out orthopedic.

Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, this not shadow Ring the flesh and blood of the present invention.

Claims

1. a large thin-wall element laser peening straightening method with complex surface, it is characterised in that: material bends change After shape, when using high power laser impact specimen surface, small plastic deformation and residual compressive stress can be applied at material surface Layer, under the effect of residual compressive stress, material is by the direction projection contrary along laser light incident, forms flexural deformation thus by material Material aligning.

Straightening method the most according to claim 1, it is characterised in that: there is the thin-wall part of complex surface, first pass through three Dimension its deformation behaviour of visual scanning converse works analyzing, can be divided into three parts: simple bending deformation, multi-curvature complex deformation and There is the deformed region of undeformed labyrinth.

Straightening method the most according to claim 2, it is characterised in that: simple bending is deformed, by measuring deformation ruler After very little, the selected orthopedic region of shot-peening, painting is covered with absorbed layer and restraint layer uses rational laser parameter to rush deformed region Hit and process.

Straightening method the most according to claim 2, it is characterised in that: for multi-curvature complex deformation, first analyze deformation Curvature, closely region complicated for deformation, there is the coupling that is overlapped mutually of deformation between orthopedic region, planning laser peening is suitable Sequence and parameter, first process upper end deformation, and laser action, in the recessed one side of material, makes material back-flexing deform, makes Angle deviating benchmark θ, then carries out the orthopedic process of laser peening to lower end deformation, when scanning is to deformable transition region, and laser sprays The orthopedic beginning of ball produces synergistic effect, now calculates the accumulative effect of deformation every time, accurately calculates laser energy, from entering Crossing district to leaving transition region, laser energy is gradually reduced, and progressively compensates the bias θ of orthopedic generation for the first time, makes material deform Recover to original configuration.

Straightening method the most according to claim 2, it is characterised in that: for having the deformed area of undeformed labyrinth Territory, introduces one protection absorbed layer, covers on the surface that need to protect, it is to avoid the impact of its Stimulated Light shock wave.

Straightening method the most according to claim 5, it is characterised in that: a kind of protection absorbed layer, it is characterised in that: described guarantor Protecting absorbed layer is porous organization, wherein comprises many tetrahedral metallic particles, and loose structure can have unloading impulse photoinduction punching Hitting ripple so that it is be difficult to arrive shielded surface, metallic particles can reflect a part of laser energy, makes laser energy inhale in protection Receiving layer can quickly be absorbed, produce shock wave at different directions and cancel out each other, weakening greatly is propagated to protected surface Shock wave.