CN108411102B - 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 PDF

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Publication number
CN108411102B
CN108411102B CN201810325591.8A CN201810325591A CN108411102B CN 108411102 B CN108411102 B CN 108411102B CN 201810325591 A CN201810325591 A CN 201810325591A CN 108411102 B CN108411102 B CN 108411102B
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laser
incident angle
minimum
energy
shock peening
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CN108411102A (en
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卢国鑫
张永康
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Guangdong Radium Laser Technology Co Ltd
Nanhai District Foshan City Wide Work Large Numerical Control Equipment Collaborative Innovation Research Institute
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Guangdong Radium Laser Technology Co Ltd
Nanhai District Foshan City Wide Work Large Numerical Control Equipment Collaborative Innovation Research Institute
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D10/00Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005Modifying 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, comprising 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, the respective pulses energy chosen needed for different laser incident angles is determined, and laser energy needed for judging minimum incident angle condition is whether within the reachable technical indicator of laser;S104, if so, determine parts to be processed movement routine, 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

A kind of laser shock peening method of variable incident angle degree
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 technique
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 mentions 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 obvious stress concentration effect tooth root region Equal laser parameters, to guarantee that strengthening region has the stress distribution and relatively uniform strengthening effect of balance.
As a kind of laser shock peening method of turbine disc mortise structure of Chinese patent CN201410143616.4 discloses 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 not can guarantee impact The processing quality of the uniformity of reinforcing, tenon groove structure cannot ensure.
Summary of the invention
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, promotes the uniformity that strengthening effect is distributed in shock zone.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of laser shock peening method of variable incident angle degree, comprising 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 movement routine 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, guarantees 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 finally to strengthen the maximum laser energy of position in laser for minimum incident angle Allow using within section.
Further, the movement routine that parts to be processed is determined in the step S104 includes that laser-impact processing originates in 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, In 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 The intensive treatment from minimum incident angle position to another side end face of laser is completed in relative position.
Further, the overlap joint rule for different shape hot spot being determined in the step S104 includes connecting adjacent spots intersection point 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 beneficial 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, mention Rise the uniformity of residual compressive stress distribution.
Detailed description of the invention
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;
Fig. 3 is that axially parallel tongue-and-groove class formation region minimum to be fortified swashs a kind of wheel disc provided by the embodiment of the present invention The choosing method schematic diagram of angle of light;
Fig. 4 be a kind of tongue-and-groove class formation region to be fortified axially not parallel with wheel disc provided by the embodiment of the present invention most The choosing method schematic diagram of small laser incident angle;
Fig. 5 is that a kind of turbine disk-like accessory tongue-and-groove characteristic area progress variable incident angle degree provided by the embodiment of the present invention is sharp Movement routine schematic diagram when light shock peening;
Fig. 6 defines schematic diagram for a kind of hot spot overlapping rate provided by the embodiment of the present invention;
Fig. 7 is a kind of turbine disc mortise tooth root region provided by the embodiment of the present invention at variable incident angle degree laser-impact Movement locus schematic diagram during reason.
Specific embodiment
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 Domain ordinary person every other embodiment obtained without making creative work, belongs to protection of the invention Range.
A kind of embodiment: 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, judge minimum laser incident angle αmin, determine Penetrate angular extensions alphamin90 ° of≤α <;
Wherein, the purpose of this step is to test the form parameter in region to be fortified, determines adjacent parts 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, usual tenon groove structure is there are two types of the distribution modes of turbine disk circumferencial direction, i.e., tongue-and-groove is axial parallel (vertical with end face with wheel disc 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 default (this programme default 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 determines the respective pulses energy chosen needed for different laser incident angle α, And whether laser energy needed for judging minimum incident angle condition is within the reachable technical indicator of laser;If so, into S104;If it is not, then terminating process;
Wherein, this step, which is established, has obtained the laser minimum incident angle α in region to be fortified in S101, S102minAnd it hangs down Required laser energy E when straight incident0On the basis of.Default 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, is just able to achieve 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, finally to strengthen the maximum laser energy of position in laser for minimum incident angle Device allows using within section.
S104: determining the movement routine of 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 movement routine.In the movement routine, laser-impact processing originates in tongue-and-groove tooth root and the minimum of machining area is waited to 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 movement routine 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 movement routine of parts to be processed required by realizing the moving line, and 13 be area to be fortified Domain laser irradiation shape obtained under the conditions of the part movement routine.
It is worth noting that, need to be adjusted again after completing the intensive treatment from laser light incident initial position to a side end face 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 processing.
In addition, the laser irradiation shape based on the region to be processed obtained under the conditions of the movement routine of the parts to be processed 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 pass through two crosspoints in control 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 with the length ratio of the short axle in oval irradiation face in the laser impact intensified of variable incident angle degree Spot overlaps foundation.For example, Fig. 6 shows the shape for irradiating face when laser beam is incident on region to be fortified with different angle Shape, wherein a is 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 movement routine and the difference angle of parts to be processed has been determined by S104 the method The overlapping rate of incident laser facula is spent, 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 defaults 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 motion profile of parts to be processed Line program setting, 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 default 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 is carried using mechanical arm, parts to be processed is mobile to carry out region different location to be fortified Laser-impact processing when, (i.e. point-by-point processing) is carried out using the mobile laser-impact once of mechanical arm by the way of once.
Fig. 7 is the laser-impact for carrying out turbine disc mortise tooth root region using the method for variable incident angle degree in practical applications When processing, the schematic diagram of turbine disk motion profile.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 all do not depart from the lower equivalent or modification completed of spirit disclosed in this invention Range.

Claims (5)

1. a kind of laser shock peening method of variable incident angle degree, which comprises the following steps:
S101, foundation test the shape feature of resulting parts to be processed strengthening region, judge adjacent parts to light beam incidence Influence degree obtains maximum minimum laser incident angle, determines the range of incident angle;
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 minimum laser incident angle, 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 movement routine of work part determines the overlap joint rule of elliptical spot;
S105, shock peening operation is carried out by incidence angles degree using the pulse laser of different-energy;
It, can be with if maximum laser energy needed for minimum incident angle is more than the reachable technical indicator of laser in the step S103 The pulse width suitable for parts to be processed, spot size and vertical incidence item are reselected in the optional range of laser parameter Laser energy under part, finally make maximum laser energy corresponding to minimum incident angle laser allow using section it It is interior.
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, which is incident on region to be fortified from parts to be processed both ends of the surface respectively, to be processed, and is swashed from the minimum of both ends of the surface incidence Angle of light is equal, guarantees 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 S104 The movement routine for determining 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 the relative position of parts to be processed and laser beam, complete the minimum incidence angle from laser Spend the intensive treatment of position to another side end face.
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 The overlap joint rule for determining 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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CN110394554B (en) * 2019-06-14 2021-03-02 广东镭奔激光科技有限公司 Robot motion track offline programming method for impeller disc laser shock peening
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

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CN103898313B (en) * 2014-04-10 2016-01-13 西安航空动力股份有限公司 A kind of laser shock peening method of turbine disc mortise structure
CN105039652B (en) * 2015-04-29 2017-09-05 江苏大学 A kind of uniform intensifying method of square focus spot laser-impact for curved surface

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