CN108411102A - A kind of laser shock peening method of variable incident angle degree - Google Patents
A kind of laser shock peening method of variable incident angle degree Download PDFInfo
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- CN108411102A CN108411102A CN201810325591.8A CN201810325591A CN108411102A CN 108411102 A CN108411102 A CN 108411102A CN 201810325591 A CN201810325591 A CN 201810325591A CN 108411102 A CN108411102 A CN 108411102A
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- laser
- incident angle
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- 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
Abstract
The present invention provides a kind of laser shock peening methods of variable incident angle degree, include the following steps：S101, the shape feature according to parts to be processed strengthening region, judge minimum laser incident angle, determine incident angle range；The laser parameters such as S102, initial option pulse width, spot size obtain required laser energy under the conditions of vertical incidence according to the mechanical attribute of part material；S103, it determines the respective pulses energy chosen needed for different laser incident angles, and judges laser energy needed for minimum incident angle condition whether within the reachable technical indicator of laser；S104, if so, determine parts to be processed mobile route, determine different shape hot spot overlap joint rule；S105, shock peening operation is carried out by incidence angles degree using the pulse laser of different-energy.The pulse laser shock peening processing of the small space structures such as turbine disc mortise can be achieved in the present invention, and the consistency of laser-impact intensity can be kept in strengthening process, promotes the uniformity of residual compressive stress distribution.
Description
Technical field
The present invention relates to material surface strengthening process fields, and in particular to a kind of laser impact intensified side of variable incident angle degree
Method.
Background technology
Laser-impact be it is a kind of using strong laser induced shock wave come the new technology of reinforced metal, can be greatly enhanced
The durability of metal material.Since laser has preferable accessibility, reiforcing laser impact technology is thin particularly suitable for wall and type
The parts such as the blade of aviation engine of face complexity.It is answered during the work time by centrifugation at the tongue-and-groove position of aero-engine turbine disk
Fatigue fracture failure easily occurs for the superposition of power and vibration stress etc., and the demand to advanced surface strengthening technology increasingly carries
It is high.Tenon groove structure it is complicated and due to the positions such as tenon tooth interfere and there are tooth roots etc. cannot achieve laser beam vertical incidence
Region to be fortified need to reasonably select incident angle and pulse width to the reinforcing with apparent stress concentration effect tooth root region
Equal laser parameters, to ensure that strengthening region has the stress distribution of balance and relatively uniform reinforcing effect.
As a kind of laser shock peening methods of turbine disc mortise structure of Chinese patent CN201410143616.4 disclose
Including cleaning part, setting absorbed layer, setting restraint layer, parts fixation, the laser impact intensified angle of adjustment, determine laser-impact
Technological parameter, progress laser-impact and etc., but the patent excessively limits to the selection of incident angle, and can not ensure to impact
The processing quality of the uniformity of reinforcing, tenon groove structure cannot ensure.
Invention content
It in view of the deficiencies of the prior art, can the present invention provides a kind of laser shock peening method of variable incident angle degree
It realizes the surface Hardening Treatment of the small space structures such as turbine disc mortise, is promoted and strengthen the uniformity that effect is distributed in shock zone.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of laser shock peening method of variable incident angle degree, includes the following steps：
S101, the shape feature according to parts to be processed strengthening region, judge minimum laser incident angle, determine incidence angle
Spend range；
The laser parameters such as S102, initial option pulse width, spot size, are hung down according to the mechanical attribute of part material
Required laser energy under the conditions of straight incidence；
S103, it determines the respective pulses energy chosen needed for different laser incident angles, and judges minimum incident angle item
Whether laser energy needed for part is within the reachable technical indicator of laser；
If laser energy needed for S104, minimum incident angle condition is in laser up in technical indicator, it is determined that be added
The mobile route of work part determines the overlap joint rule of different shape hot spot；
S105, shock peening operation is carried out by incidence angles degree using the pulse laser of different-energy.
Further, laser beam is incident on region to be fortified from parts to be processed both ends of the surface respectively in the step S101
It is processed, and equal from the minimum laser incident angle of both ends of the surface incidence, ensures to handle to entire region to be fortified
When selected minimum laser incident angle be maximum value.
Further, in the step S103 can by oblique incidence shock peening region carry out laser energy compensation with
Reach the processing intensity under the conditions of vertical incidence, passes through formula E=E0/ sin α, it may be determined that choosing needed for different laser incident angle α
The respective pulses energy taken.
Further, if laser energy needed for minimum incident angle is more than the reachable technology of laser in the step S103
Index, can be reselected in the optional range of laser parameter the pulse width suitable for parts to be processed, spot size and
Laser energy under the conditions of vertical incidence, it is final so that strengthening the maximum laser energy of position in laser for minimum incident angle
Allow using within section.
Further, determine that the mobile route of parts to be processed includes that laser-impact processing originates in the step S104
The minimum incident angle position in region to be processed is then carried out to both ends of the surface direction with the incident angle of continuous improvement respectively,
After completing intensive treatment from laser light incident initial position to a side end face, parts to be processed and laser beam need to be readjusted
Relative position completes the intensive treatment from minimum incident angle position to another side end face of laser.
Further, determine that the overlap joint rule of different shape hot spot includes connecting adjacent spots intersection point in the step S104
The length ratio of the length of line and the short axle in oval irradiation face is defined as hot spot overlapping rate, and the hot spot overlapping rate is becoming incident
The laser impact intensified of angle remains unchanged in the process.
A kind of advantageous effect of the laser shock peening method of variable incident angle degree provided by the invention is：
Change laser incident angle in real time based on Working position, is adjusted by laser energy strong to the processing of oblique incidence position
Degree compensates, and the part region to be fortified for solving the small space structures such as turbine disc mortise cannot achieve the skill of laser vertical incidence
Art problem, while can keep the consistency of laser-impact intensity during strengthening the hardly possible machining area such as tenon tooth tooth root, carrying
Rise the uniformity of residual compressive stress distribution.
Description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is to need to carry out the turbine disc mortise tooth root region schematic diagram of laser impact intensified processing in practical application；
Axially parallel tongue-and-groove class formation region minimum to be fortified swashs a kind of wheel disc that Fig. 3 is provided by the embodiment of the present invention
The choosing method schematic diagram of angle of light；
Axially not parallel tongue-and-groove class formation region to be fortified is most for a kind of and wheel disc that Fig. 4 is provided by the embodiment of the present invention
The choosing method schematic diagram of small laser incident angle；
Fig. 5 carries out variable incident angle degree by a kind of turbine disk-like accessory tongue-and-groove characteristic area that the embodiment of the present invention provides and swashs
Mobile route schematic diagram when light shock peening；
Fig. 6 defines schematic diagram by a kind of hot spot overlapping rate that the embodiment of the present invention provides；
A kind of turbine disc mortise tooth root region that Fig. 7 is provided by the embodiment of the present invention is at variable incident angle degree laser-impact
Movement locus schematic diagram during reason.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Ability
The every other embodiment that domain ordinary person is obtained without making creative work belongs to the protection of the present invention
Range.
Embodiment：A kind of laser shock peening method of variable incident angle degree.
A kind of laser shock peening method of variable incident angle degree, specific steps include：
S101：According to the shape feature of parts to be processed strengthening region, minimum laser incident angle α is judgedmin, determine
Penetrate angular extensions alphamin90 ° of≤α ＜；
Wherein, the purpose of this step is to test the form parameter in region to be fortified, and judgement adjacent parts are to light beam incidence
Influence degree obtains maximum minimum laser incident angle αmin, so that it is determined that the variation range of laser incident angle.Citing comes
It says, there are two types of the distribution modes of turbine disk circumferencial direction, i.e., tongue-and-groove is axially parallel with wheel disc (hangs down usual tenon groove structure with end face
Directly) and not parallel, the tongue-and-groove tooth root of two types wheel disc is when selecting minimum laser incident angle with different approach.
Fig. 2 is turbine disc mortise tooth root region schematic diagram, and since transition arc radius is smaller between tenon tooth, which has tight
The stress concentration phenomenon of weight.During carrying out laser impact intensified to tongue-and-groove tooth root region, it is assumed that only exist opposite site
Laser light incident generation is blocked, then the selection of minimum laser incident angle is as shown in Figure 3,4.Fig. 3,4 middle tenon grooves are respectively provided with
With the axial parallel and not parallel feature of wheel disc, 1,6 be wheel side surface, and 2,7 be region to be fortified, and 3,8 be to laser light incident
The region opposite site to be fortified for blocking influence is generated, 4,9 be laser light incident light beam, and 5,10 be special for portion structure to be fortified
Levy the maximum minimum laser incident angle chosen.
It is understood that laser beam is incident on region to be fortified from wheel disc both ends of the surface respectively and is added in this step
Work, and it is equal from the minimum laser incident angle of both ends of the surface incidence, this ensure that being handled to entire region to be fortified
When selected minimum laser incident angle be maximum value.
S102：The laser parameters such as initial option pulse width, spot size are hung down according to the mechanical attribute of part material
Required laser energy E under the conditions of straight incidence0；
Wherein, it treats for strengthening region, there are the optional ranges of the laser parameters such as pulse width, spot size for acquiescence
(this programme acquiescence uses circular light spot), the acquirement of parameter is based on shape and structure feature and properties of material mechanics etc..Due to only
Having when induced with laser shock wave can lead to the plastic deformation of material surface, laser-impact surface peening effect just will appear, because
This can obtain the teachings of required laser parameter according to Mechanical Properties of Materials etc..The parameters such as laser energy in this step
Laser impact intensified practical experience can be obtained by theoretical calculation or technical staff by obtaining, herein without specifically limiting
It is fixed.
S103：Pass through formula E=E0/ sin α determine the respective pulses energy chosen needed for different laser incident angle α,
And judge laser energy needed for minimum incident angle condition whether within the reachable technical indicator of laser；If so, into
S104；If it is not, then terminating flow；
Wherein, this step establishes the laser minimum incident angle α that region to be fortified has been obtained in S101, S102minAnd it hangs down
Required laser energy E when straight incident0On the basis of.Acquiescence can be by carrying out laser energy benefit to oblique incidence shock peening region
It repays to reach the processing intensity under the conditions of vertical incidence.The laser spoke in region to be fortified that minimum incident angle need to be used to be processed
Product of showing up is maximum and energy loss is most, is the active position of maximum laser energy.Theoretical calculation acquisition is carried out by formula
Maximum laser energy is in laser impact intensified system within the coverage of laser, could realize the complete of parts to be processed
Strengthen in region.
, can it is worth noting that, if the maximum laser energy mentioned in this step is beyond the reachable technical indicator of laser
With reselected in the optional range of laser parameter that S102 is mentioned the pulse width suitable for parts to be processed, spot size with
And laser energy under the conditions of vertical incidence, it is final so that strengthening the maximum laser energy of position in laser for minimum incident angle
Device allows using within section.
S104：The mobile route for determining parts to be processed determines the overlap joint rule of different shape hot spot；
Wherein, it is incident to provide a kind of laser impact intensified change for turbine disk-like accessory tongue-and-groove characteristic area for this step
Angle mobile route.In the mobile route, laser-impact processing originates in tongue-and-groove tooth root and the minimum of machining area is waited for enter
Angle position is penetrated, is then carried out respectively to both ends of the surface direction with the incident angle of continuous improvement.Fig. 5 be using variable incident angle degree into
When row is laser impact intensified, the mobile route schematic diagram of turbine disk-like accessory tongue-and-groove characteristic area, 11 be that laser is relatively to be fortified
The moving line in region, 12 be the mobile route for realizing the parts to be processed required by the moving line, and 13 be area to be fortified
The laser that domain is obtained under the conditions of the part mobile route irradiates shape.
It is worth noting that, after completing the intensive treatment from laser light incident initial position to a side end face, need to adjust again
The relative position of whole parts to be processed and laser beam is completed from the strong of minimum incident angle position to another side end face of laser
Change is handled.
In addition, the laser based on the region to be processed obtained under the conditions of the mobile route of the parts to be processed irradiates shape
Shape, this step additionally provide a kind of overlap joint rule of different irradiation shape hot spots.Laser beam is oblique when being mapped to region to be processed
It irradiates shape and changes into the ellipse being elongated by circle, wherein the length of the short axle in oval irradiation face is vertical equal to laser
The diameter in circle irradiation face when incident.To keep the consistent of region processing intensity to be fortified, laser-impact processing surface is reduced
Degree of roughness and the uniformity for improving residual stress distribution, the present invention is by controlling two crosspoints in adjacent spots overlapping regions
Line length formulate it is a kind of suitable for it is different irradiation shape hot spots overlap joints rule, with the length of adjacent spots intersection point line
It is remained unchanged in the process as light in the laser impact intensified of variable incident angle degree with the length ratio of the short axle in oval irradiation face
Spot overlaps foundation.For example, Fig. 6 shows the shape in irradiation face when laser beam is incident on region to be fortified with different angle
Shape, wherein a are the length of the short axle in oval irradiation face, and a ' is the length of the line of two crosspoint of adjacent spots, hot spot overlap joint
The numerical value of rate η can determine by controlling the ratio of a ' and a, i.e. η=(a '/a) × 100%.
S105：Shock peening operation is carried out by incidence angles degree using the pulse laser of different-energy.
Wherein, this step requires that the mobile route of parts to be processed and different angles is determined by S104 the methods
Spend the overlapping rate of incident laser facula, and each needed for region to be fortified under conditions of meeting the hot spot overlapping rate
The incident angle of laser beam has also obtained.
It is worth noting that, this step also gives tacit consent to the operation in the presence of programming setting reinforcement process, for laser impact intensified
For system, it is laggard in parts fixation that the Pulsed Laser Parameters, mechanical arm carry the needs such as movement locus of parts to be processed
Line program is set, and finally according to setting program, system is automatically performed impact process.Reinforcement process herein more refers to will be quantitative
The program setting that the conditions such as the laser pulse parameters of selection are implemented on specific part.
For laser impact intensified whole process, there is also shock peening operate before region absorbed layer to be fortified with
The coating procedure of restraint layer, this step give tacit consent to region to be fortified and related pretreatment, the material choosing of absorbed layer and restraint layer are completed
It selects and applies technique here without specifically limiting.
It is understood that this step carries parts to be processed movement using mechanical arm carries out region different location to be fortified
Laser-impact processing when, laser-impact once is moved using mechanical arm and carries out (i.e. point by point process) by the way of once.
Fig. 7 is the laser-impact that the method for using variable incident angle degree in practical applications carries out turbine disc mortise tooth root region
When processing, the schematic diagram of turbine disk movement locus.In figure, laser beam to the incidence of tooth root region originate in wheel disc both ends of the surface it
Between position, mechanical arm carried the turbine disk and moved with the path that rotates clockwise of approximation, completed from laser light incident start bit
It sets to the intensive treatment of a side end face.
The above is presently preferred embodiments of the present invention, but the present invention should not be limited to embodiment and attached drawing institute public affairs
The content opened both falls within protection of the present invention so every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention
Range.
Claims (6)
1. a kind of laser shock peening method of variable incident angle degree, which is characterized in that include the following steps：
S101, the shape feature according to parts to be processed strengthening region, judge minimum laser incident angle, determine incident angle model
It encloses；
The laser parameters such as S102, initial option pulse width, spot size, are vertically entered according to the mechanical attribute of part material
Required laser energy under the conditions of penetrating；
S103, it determines the respective pulses energy chosen needed for different laser incident angles, and judges minimum incident angle condition institute
Need laser energy whether within the reachable technical indicator of laser；
If maximum laser energy needed for S104, minimum incident angle condition is in laser up in technical indicator, it is determined that be added
The mobile route of work part determines the overlap joint rule of different shape hot spot；
S105, shock peening operation is carried out by incidence angles degree using the pulse laser of different-energy.
2. the laser shock peening method of variable incident angle degree as described in claim 1, it is characterised in that：In the step S101
Laser beam is incident on region to be fortified from parts to be processed both ends of the surface respectively and is processed, and swashs from the minimum of both ends of the surface incidence
Angle of light is equal, ensures that the minimum laser incident angle selected when handling entire region to be fortified is maximum
Value.
3. the laser shock peening method of variable incident angle degree as described in claim 1, it is characterised in that：In the step S103
It can be led to by carrying out laser energy compensation to oblique incidence shock peening region to reach the processing intensity under the conditions of vertical incidence
Cross formula E=E0/ sin α, it may be determined that the respective pulses energy chosen needed for different laser incident angle α.
4. the laser shock peening method of variable incident angle degree as described in claim 1, it is characterised in that：In the step S103
If maximum laser energy needed for minimum incident angle is more than the reachable technical indicator of laser, can be in the optional range of laser parameter
Laser energy under the conditions of pulse width, spot size and vertical incidence suitable for parts to be processed is inside reselected, finally
So that strengthening the maximum laser energy of position for minimum incident angle allows in laser using within section.
5. the laser shock peening method of variable incident angle degree as described in claim 1, it is characterised in that：In the step S104
Determine that the mobile route of parts to be processed includes the minimum incident angle position that laser-impact processing originates in region to be processed, and
It is carried out, is completed from laser light incident initial position a to side end face to both ends of the surface direction respectively with the incident angle of continuous improvement afterwards
Intensive treatment after, need to readjust parts to be processed and the relative position of laser beam, complete the minimum incidence angle from laser
Spend the intensive treatment of position to another side end face.
6. the laser shock peening method of variable incident angle degree as described in claim 1, it is characterised in that：In the step S104
Determine that the overlap joint rule of different shape hot spot includes by the short axle of the length of adjacent spots intersection point line and oval irradiation face
Length ratio is defined as hot spot overlapping rate, and the hot spot overlapping rate is kept not in the process in the laser impact intensified of variable incident angle degree
Become.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394554A (en) * | 2019-06-14 | 2019-11-01 | 广东镭奔激光科技有限公司 | A kind of robot motion track off-line programing method that the impeller disk is laser impact intensified |
| CN110438332A (en) * | 2019-06-14 | 2019-11-12 | 广东镭奔激光科技有限公司 | High temperature alloy small size turbine disc mortise position laser shock peening method |
| CN112725613A (en) * | 2020-12-24 | 2021-04-30 | 山东大学 | Non-single incident angle unequal intensity laser shock processing method |
| CN113088673A (en) * | 2021-03-25 | 2021-07-09 | 苏州健雄职业技术学院 | Laser oblique impact technological parameter design method suitable for deep hole structure |
| CN113528777A (en) * | 2021-06-18 | 2021-10-22 | 华南理工大学 | Residual stress regulation and control method for laser shot blasting repair process of damaged part of airplane |
| CN115572812A (en) * | 2021-06-21 | 2023-01-06 | 中国科学院沈阳自动化研究所 | Efficient laser shock peening control method based on technological parameter matching |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394554A (en) * | 2019-06-14 | 2019-11-01 | 广东镭奔激光科技有限公司 | A kind of robot motion track off-line programing method that the impeller disk is laser impact intensified |
| CN110438332A (en) * | 2019-06-14 | 2019-11-12 | 广东镭奔激光科技有限公司 | High temperature alloy small size turbine disc mortise position laser shock peening method |
| CN112725613A (en) * | 2020-12-24 | 2021-04-30 | 山东大学 | Non-single incident angle unequal intensity laser shock processing method |
| CN113088673A (en) * | 2021-03-25 | 2021-07-09 | 苏州健雄职业技术学院 | Laser oblique impact technological parameter design method suitable for deep hole structure |
| CN113528777A (en) * | 2021-06-18 | 2021-10-22 | 华南理工大学 | Residual stress regulation and control method for laser shot blasting repair process of damaged part of airplane |
| CN115572812A (en) * | 2021-06-21 | 2023-01-06 | 中国科学院沈阳自动化研究所 | Efficient laser shock peening control method based on technological parameter matching |
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Effective date of registration: 20210802 Address after: 528255 self prepared No. 2 on the first floor of Building 5, phase I workshop of "Magang" Huiquan science and technology industry center, Shishan Enterprise Joint Corporation, Shishan town, Nanhai District, Foshan City, Guangdong Province (residence declaration) Patentee after: GUANGDONG LEIBEN LASER TECHNOLOGY Co.,Ltd. Address before: 528200 4th Floor, Building A, Foshan Nanhai High-tech Zone, Guangdong Province Patentee before: FOSHAN NANHAI GUANGDONG TECHNOLOGY University CNC EQUIPMENT COOPERATIVE INNOVATION INSTITUTE Patentee before: GUANGDONG LEIBEN LASER TECHNOLOGY Co.,Ltd. |