CN111748682A - Laser strengthening method for gear tooth surface - Google Patents
Laser strengthening method for gear tooth surface Download PDFInfo
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- CN111748682A CN111748682A CN202010650091.9A CN202010650091A CN111748682A CN 111748682 A CN111748682 A CN 111748682A CN 202010650091 A CN202010650091 A CN 202010650091A CN 111748682 A CN111748682 A CN 111748682A
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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 invention provides a laser strengthening method for a gear tooth surface, and relates to the technical field of laser surface shock strengthening. The laser strengthening method of the gear tooth surface is used for strengthening the region to be strengthened of the tooth surface, and comprises the following steps: forming a protective layer in a region to be strengthened of the tooth surface, wherein the protective layer is used for absorbing the light energy of laser; carrying out multiple laser scanning on the region to be strengthened according to preset parameters, enabling the overlapping rate of light spots of two adjacent scans to be in a first range, and forming a constraint layer on one side, away from the tooth surface, of the protection layer in the laser scanning process; removing the protective layer to form a reinforced area; and detecting performance parameters of the strengthening region, and completing strengthening when the performance parameters are in a second range, wherein the performance parameters comprise at least one of tooth surface hardness, residual compressive stress and stress action depth. The strengthening method disclosed by the invention can ensure that the stress and the hardness are uniformly distributed, ensure the strengthening effect of the gear and prolong the service life of the gear.
Description
Technical Field
The disclosure relates to the technical field of laser surface impact strengthening, in particular to a laser strengthening method for a gear tooth surface.
Background
The gear is an aeroengine and a core component, and in the working process of the engine, because the gear is in a high-temperature and high-load environment for a long time, fatigue damage is easy to occur to influence the normal work of the gear, the gear needs to be strengthened to prolong the fatigue life of the gear.
In the related art, the gear is strengthened mainly by carburizing and shot peening, but shot peening needs to be performed in a specially-arranged closed space, and the residual compressive stress and hardness distribution of the strengthened tooth surface are uneven, so that local deformation is easy to occur, and the strengthening effect is poor.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to overcome the above disadvantages in the prior art, and provides a laser strengthening method for a gear tooth surface, which can ensure uniform distribution of stress and hardness, ensure a strengthening effect of a gear, and prolong a service life of the gear.
According to one aspect of the present disclosure, there is provided a laser strengthening method of a gear tooth surface for strengthening a region to be strengthened of the tooth surface, the strengthening method comprising:
forming a protective layer on a region to be strengthened of the tooth surface, wherein the protective layer is used for absorbing the light energy of laser;
carrying out multiple laser scanning on the region to be strengthened according to preset parameters, enabling the overlapping rate of light spots of two adjacent scans to be in a first range, and forming a constraint layer on one side, away from the tooth surface, of the protection layer in the laser scanning process;
removing the protective layer to form a reinforced area;
and detecting performance parameters of the strengthening region, and completing strengthening when the performance parameters are in a second range, wherein the performance parameters comprise at least one of tooth surface hardness, residual compressive stress and stress action depth.
In an exemplary embodiment of the present disclosure, before forming the protective layer on the region to be strengthened of the tooth surface, the strengthening method further includes:
cleaning the tooth surface of the gear by using a cleaning agent;
and drying the gear tooth surface subjected to the cleaning treatment.
In an exemplary embodiment of the present disclosure, the preset parameters include laser energy, laser pulse width, and spot diameter, and the laser scanning the region to be strengthened according to the preset parameters includes:
and scanning the area to be strengthened by adopting a laser scanning device, wherein the laser energy is 4.8J-5.2J, the laser pulse width is 18 ns-20 ns, and the spot diameter is 2.1 mm-2.3 mm.
In an exemplary embodiment of the present disclosure, the forming a constraining layer on a side of the protective layer facing away from the tooth surface during laser scanning includes:
and spraying water flow to the area to be strengthened by using a nozzle in the laser scanning process so as to form a water restraint layer on the surface of the protective layer.
In an exemplary embodiment of the present disclosure, the first range is 40% to 50%.
In an exemplary embodiment of the disclosure, the performance parameters include tooth surface hardness, residual compressive stress, and stress depth of action, and the detecting the performance parameter of the strengthened region, and when the performance parameter is in a second range, completing strengthening includes:
and respectively detecting the hardness, the residual compressive stress and the stress action depth of the strengthening region, and completing the strengthening when the hardness is greater than a first threshold value, the residual compressive stress is greater than a second threshold value and the stress action depth is in a specific range.
In an exemplary embodiment of the present disclosure, the first threshold is 820HV, the second threshold is 950Mpa, and the specific range is 0.8mm to 1 mm.
In an exemplary embodiment of the present disclosure, the protective layer is an organic film layer, and the removing the protective layer to form the strengthened region includes:
and dissolving the organic film layer by adopting an organic solvent so that the organic film layer does not cover the area to be strengthened any more.
In an exemplary embodiment of the present disclosure, an angle between the laser beam and the protective layer is 30 ° to 45 ° during the laser scanning.
In an exemplary embodiment of the present disclosure, a distance between an emission position of the laser light and a position where the laser light contacts the protective layer is 505mm to 515 mm.
According to the laser strengthening method for the gear tooth surface, the laser scanning device can be adopted to scan the region to be strengthened, so that plasma high-pressure shock waves are generated, performance parameters of the region to be strengthened are optimized, and the fatigue life of the gear is prolonged. In the process, the protective layer can absorb laser energy to prevent the surface of the region to be strengthened from being damaged due to overlarge laser energy; meanwhile, the expansion of the plasma can be restrained through the restraint layer, so that the peak pressure of the shock wave is improved, and the stress action depth is improved; in addition, when the overlapping rate of the light spots scanned twice is in the first range, the stress and the hardness can be uniformly distributed, and the gear with the tooth surface hardness, the residual compressive stress and the stress action depth in the second range can be screened out by detecting the tooth surface hardness, the residual compressive stress and the stress action depth of the strengthened region, so that the strengthening effect of the gear is ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a flowchart of a method of laser strengthening a gear tooth surface according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a region to be strengthened according to an embodiment of the disclosure.
FIG. 3 is a schematic diagram of a protective layer and a constraining layer according to an embodiment of the disclosure.
Fig. 4 is a schematic diagram of a light spot after the first scan in the embodiment of the disclosure.
Fig. 5 is a schematic diagram of a light spot after the second scanning in the embodiment of the disclosure.
Fig. 6 is a schematic diagram of a light spot after the third scanning in the embodiment of the disclosure.
In the figure: 100. a gear; 1. a tooth surface; 11. a region to be strengthened; 2. a protective layer; 3. a constraining layer; 31. a flow of water; 4. a laser beam; 41. a light spot.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The terms "the" and "said" are used to indicate the presence of one or more elements/components/etc.; the term "comprising" is used in an open-ended inclusive sense and means that there may be additional elements/components/etc. other than the listed elements/components/etc. The terms "first," "second," and "third" are used merely as labels, and are not limiting as to the number of their objects.
The disclosed embodiment provides a laser strengthening method for a gear tooth surface, which is used for strengthening a region to be strengthened of the tooth surface, and as shown in fig. 1, the strengthening method can comprise the following steps:
step S110, forming a protective layer in a region to be strengthened of the tooth surface, wherein the protective layer is used for absorbing the light energy of laser;
step S120, performing multiple laser scanning on the region to be strengthened according to preset parameters to enable the overlapping rate of light spots of two adjacent scans to be in a first range, and forming a constraint layer on one side, away from the tooth surface, of the protection layer in the laser scanning process;
step S130, removing the protective layer to form a reinforced area;
step S140, detecting performance parameters of the strengthening region, and completing strengthening when the performance parameters are in a second range, wherein the performance parameters comprise at least one of tooth surface hardness, residual compressive stress and stress action depth.
According to the laser strengthening method for the gear tooth surface, the laser scanning device can be adopted to scan the region to be strengthened, so that plasma high-pressure shock waves are generated, performance parameters of the region to be strengthened are optimized, and the fatigue life of the gear is prolonged. In the process, the protective layer can absorb laser energy to prevent the surface of the region to be strengthened from being damaged due to overlarge laser energy; meanwhile, the expansion of the plasma can be restrained through the restraint layer, so that the peak pressure of the shock wave is improved, and the stress action depth is improved; in addition, when the overlapping rate of the light spots scanned twice is in the first range, the stress and the hardness can be uniformly distributed, and the gear with the tooth surface hardness, the residual compressive stress and the stress action depth in the second range can be screened out by detecting the tooth surface hardness, the residual compressive stress and the stress action depth of the strengthened region, so that the strengthening effect of the gear is ensured.
The following describes in detail the steps of the strengthening method according to the embodiment of the present disclosure:
as shown in fig. 1, in step S110, a protective layer for absorbing light energy of laser light is formed on a region to be strengthened of the tooth surface.
As shown in fig. 2, the gear 100 may be a transmission gear of an aircraft engine, and may include a toothed disc and a plurality of gear teeth, each gear tooth may be uniformly distributed in a circumferential direction of the toothed disc, and two adjacent gear teeth may be connected end to end. The gear teeth and the gear plate can be in an integrated structure, and the integrated structure of the gear 100 and the gear plate can be formed through an integrated forming process. The material of the gear teeth may be a rigid material, for example, it may be gear steel, and of course, it may also be other materials with stronger rigidity, and is not limited herein. The tooth surface 1 may be a side surface located between an addendum cylindrical surface and a dedendum cylindrical surface of the gear tooth, and the side surface may be an inclined plane or a curved surface having a certain curvature, which is not particularly limited herein. The region 11 to be strengthened may be the entire region of the tooth surface 1 between two adjacent teeth, or may be a partial region in a certain tooth surface 1, and is not particularly limited herein.
Before the laser strengthening is performed on the tooth surface 1, a protective layer may be formed in the region to be strengthened 11, and the protective layer may be a release layer attached to the surface of the region to be strengthened 11, or may be a film formed on the surface of the region to be strengthened 11 or a coating sprayed on the surface of the region to be strengthened 11, which is not particularly limited herein. The protective layer can be made of light absorption material, and can be used for absorbing laser energy and preventing the surface of the region to be strengthened from being damaged due to the fact that the laser energy is too large. For example, the protective layer may be an organic film layer, which may be formed by spraying a resin material.
In one embodiment of the present disclosure, as shown in fig. 1, before forming the protective layer in the region 11 to be strengthened of the tooth surface 1, the strengthening method of the present disclosure may further include:
and S100, cleaning the gear tooth surface by using a cleaning agent.
The gear tooth surface 1 can be cleaned by adopting an organic cleaning agent to remove impurities and oil stains on the surface of the gear tooth surface 1. The organic cleaning agent may be kerosene, alcohol, acetone, isopropyl alcohol, or the like, but may be any other cleaning agent that can remove impurities and oil stains on the surface of the tooth surface 1 without damaging the tooth surface 1, and is not listed here. For example, the gear tooth surface 1 may be ultrasonically cleaned by an ultrasonic cleaning machine, or impurities and oil stains on the gear tooth surface 1 may be separated from the gear tooth surface 1 by a centrifugal method, or of course, the gear tooth surface 1 may be cleaned by other methods, which is not limited herein.
Step S101, drying the gear tooth surface subjected to the cleaning treatment.
The gear tooth surface 1 after the cleaning treatment may be dried, for example, the gear tooth surface 1 after the cleaning treatment may be placed in an oven for drying, or the gear tooth surface 1 may be dried by blowing air with a fan, or naturally dried, and the drying is not particularly limited as long as the gear tooth surface can be dried without introducing new impurities. It should be noted that the gear tooth surface 1 may be placed in a constant temperature and humidity environment for standby after being cleaned and dried.
As shown in fig. 1, in step S120, multiple laser scans are performed on the region to be strengthened according to preset parameters, so that the overlapping ratio of the light spots of two adjacent scans is within a first range, and a constraint layer is formed on a side of the protective layer away from the tooth surface during the laser scanning.
The preset parameters may be preset laser scanning operating parameters, which may include laser energy, laser pulse width, and spot diameter, and of course, may also include other operating parameters, which are not listed here. The setting range of each preset parameter can be determined through a simulation experiment before the solid gear tooth surface 1 is subjected to laser strengthening, so that the solid workpiece can be prevented from being adopted for testing, the material waste is reduced, and the cost is reduced.
For example, finite element analysis software may be used to create a gear simulation model, and material properties may be added to the gear simulation model to simulate the material properties of the real gear 100. Initial laser energy, initial laser pulse width and initial spot diameter can be set in finite element analysis software, and a gear simulation model is subjected to multiple simulation strengthening tests according to the initial laser energy, the initial laser pulse width and the initial spot diameter. And a computer program can be programmed, and the hardness, the residual compressive stress and the stress action depth of the simulation model after the simulation strengthening test are tested through the set computer program.
It should be noted that the hardness range, the residual compressive stress range and the stress action depth range meeting the strengthening standard can be preset in the analysis software, when one or more of the hardness, the residual compressive stress or the stress action depth obtained by the test does not meet the preset range, the initial laser energy, the initial laser pulse width and the initial spot diameter can be correspondingly adjusted, the gear simulation model can be subjected to multiple simulation strengthening tests, and the initial laser energy, the initial laser pulse width and the initial spot diameter can be correspondingly adjusted after each strengthening test until the strengthened hardness, the residual compressive stress and the stress action depth meet the strengthening standard. The hardness range, the residual compressive stress range and the stress action depth range obtained by the simulation strengthening test can be used as the value range of the preset parameters of the strengthening test of the solid gear 100.
The laser energy range obtained after multiple simulation strengthening tests is 4.8J-5.2J, for example, the laser energy range can be 4.8J, 4.9J, 5.0J, 5.1J or 5.2J; the laser pulse width ranges from 18ns to 20ns, which may be 18ns, 19ns or 20ns, for example; the spot diameter ranges from 2.1mm to 2.3mm, for example, it may be 2.1mm, 2.2mm or 2.3mm, but of course, it may be other energy values, other pulse widths or other spot diameters, which are not listed here.
It should be noted that the above ranges are only applicable to gear steel, and the laser energy range, the laser pulse width range and the spot diameter range are closely related to the material of the gear 100, and the hardness range, the residual compressive stress range and the stress action depth range corresponding to different materials may be different or the same, and are not particularly limited herein.
As shown in fig. 3, in the simulation strengthening test process, an included angle θ between the laser beam and the tooth surface 1 and a distance between the emitting position of the laser and the position where the laser contacts the tooth surface 1 may also be simulated to prevent the strengthening effect from being affected by the shielding of the laser by the top of the gear teeth in the laser strengthening process.
The included angle between the laser beam obtained after multiple simulation tests and the tooth surface 1 can be 30-45 degrees, for example, the included angle can be 30 degrees, 35 degrees, 40 degrees or 45 degrees; the distance between the laser emitting position and the position where the laser contacts the tooth surface 1 may be 505mm to 515mm, and may be, for example, 505mm, 507mm, 509mm, 511mm, 513mm, or 515mm, or may be other angles or distances, which is not particularly limited herein.
When the gear 100 entity is strengthened by laser, the gear tooth surface 1 comprising the protective layer 2 can be fixed on a processing platform through a clamp, the distance between the emitting position of the laser and the position where the laser is contacted with the protective layer 2 is adjusted to be 505-515 mm according to the simulation analysis result, and the included angle between the laser beam 4 and the protective layer 2 is adjusted to be 30-45 degrees. In addition, laser energy, laser pulse width and spot diameter can be set according to the value range of the preset parameters obtained by simulation, and the laser scanning device is started to scan the region to be strengthened 11 after the parameters are set.
For example, the distance between the emitting position of the laser and the position where the laser contacts the tooth surface 1 may be 510mm, the included angle θ between the tooth surface 1 and the laser beam may be 45 °, the laser energy may be 5J, the laser pulse width may be 18ns, and the laser spot diameter may be Φ 2.2mm, but each preset parameter may also be other values, and is not particularly limited herein.
In the reinforcing process, in order to make the stress and hardness distribution in each part of the region 11 to be reinforced uniform, the region 11 to be reinforced may be scanned multiple times, and the light spots of two adjacent scans may be distributed in a staggered manner, and the overlapping ratio may be in a first range, which may be 40% to 50%, for example, 40%, 42%, 44%, 46%, 48% or 50%, of course, other overlapping ratios may also be used, which are not listed here. For example, 3 times of scanning may be performed on the region to be enhanced 11 in the first enhancing process, as shown in fig. 4-6, the light spots 41 of the second scanning may be distributed in the region between two adjacent light spots 41 in the light spots 41 of the first scanning, and the overlapping ratio between the light spots 41 of the second scanning and the light spots 41 below the second scanning may be 40% to 50%, the light spots 41 of the third scanning may cover the region between two adjacent light spots 41 in the light spots 41 of the second scanning, and the overlapping ratio between the light spots 41 of the third scanning and the light spots formed by the second scanning may be 40% to 50%.
In one embodiment of the present disclosure, the constraining layer 3 may be formed on the side of the protective layer 2 of the region 11 to be strengthened away from the tooth surface 1 during the laser scanning process, and the expansion of plasma may be constrained by the constraining layer 3, so as to increase the peak pressure of the shock wave, increase the stress action depth, and also generate reflection to the shock wave, thereby prolonging the action time of the shock wave. The material of the constraining layer 3 may be water, and the water constraining layer 3 may be formed in real time on the surface of the protective layer 2 facing away from the tooth surface 1 during laser scanning.
For example, the laser scanning device may include a nozzle, which may be directed toward the protective layer 2, and may spray a water stream 31 toward the protective layer 2 in the region 11 to be strengthened during the laser strengthening process. Specifically, the position of the nozzle where the water stream 31 is jetted to the protective layer 2 and the position where the laser spot is irradiated to the protective layer 2 may be shifted from each other so as not to affect the laser strengthening effect. For example, the distance between the position where the water stream 31 is jetted to the protective layer 2 and the position where the laser spot is irradiated to the protective layer 2 may be 30mm to 50mm, and the angle between the water stream 31 and the laser beam 4 may be 45 ° to 90 °. The water spraying speed can be adjusted to form a smooth and uniform water curtain at the laser strengthening position, and the water restraint layer 3 can be in a dynamic balance state in the laser strengthening process.
As shown in fig. 1, in step S130, the protection layer 2 is removed to form a strengthened region.
After the laser strengthening operation is completed, the protective layer 2 on the surface of the region to be strengthened 11 can be removed to form a strengthened region. In one embodiment, the protection layer 2 is an organic film layer, which can be dissolved by an organic solvent, so that the organic film layer no longer covers the region 11 to be strengthened. The organic solvent may be kerosene, alcohol, acetone, isopropyl alcohol, or the like, and of course, other solvents may be used, and is not particularly limited as long as the organic film layer can be removed without causing damage to the tooth surface 1.
As shown in fig. 1, in step S140, a performance parameter of the strengthened region is detected, and the strengthening is completed when the performance parameter is in a second range, where the performance parameter includes at least one of tooth surface hardness, residual compressive stress, and stress acting depth.
The performance of the strengthened area can be detected to obtain performance parameters of the strengthened area so as to verify the strengthening effect, so that the gear 100 meeting the strengthening standard and the gear 100 not meeting the strengthening standard can be classified. The performance parameter may include at least one of a tooth surface hardness, a residual compressive stress, and a stress depth of action, and the tooth surface hardness, the residual compressive stress, or the stress depth of action of the strengthened region may be detected, and when the detected performance parameter is in the second range, it may be determined that the strengthening of the tooth surface 1 is completed. The second range may be a range of values corresponding to each parameter that meets the enhancement criteria, which may include a plurality of types of ranges of values, and different types of performance parameters may have a range of values uniquely corresponding thereto.
In one embodiment, the performance parameters include tooth surface hardness, residual compressive stress and stress depth of action, the hardness of the tooth surface can be detected by a hardness meter, the residual compressive stress and stress depth of action of the tooth surface 1 can be detected by a stress measuring instrument, and when the hardness is greater than a first threshold value, the residual compressive stress is greater than a second threshold value and the stress depth of action is within a specific range, the tooth surface 1 is judged to be strengthened. In one embodiment, the first threshold may be 820HV, the second threshold may be 950MPa, and the specific range may be 0.8mm to 1 mm. Namely: when the hardness is larger than 820HV, the residual compressive stress is larger than 950Mpa, and the stress action depth is between 0.8mm and 1mm, the strengthening of the tooth surface 1 can be judged to be finished. Of course, other thresholds or value ranges are also possible, and are not particularly limited herein.
When any one of the tooth surface hardness, the residual compressive stress, and the depth of action of the stress does not satisfy the condition, it is determined that the strengthening is not completed, and the gear 100 that has not been strengthened can be recycled or scrapped.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. A laser strengthening method of a gear tooth surface for strengthening a region of the tooth surface to be strengthened, the strengthening method comprising:
forming a protective layer on a region to be strengthened of the tooth surface, wherein the protective layer is used for absorbing the light energy of laser;
carrying out multiple laser scanning on the region to be strengthened according to preset parameters, enabling the overlapping rate of light spots of two adjacent scans to be in a first range, and forming a constraint layer on one side, away from the tooth surface, of the protection layer in the laser scanning process;
removing the protective layer to form a reinforced area;
and detecting performance parameters of the strengthening region, and completing strengthening when the performance parameters are in a second range, wherein the performance parameters comprise at least one of tooth surface hardness, residual compressive stress and stress action depth.
2. The strengthening method according to claim 1, wherein before forming the protective layer on the region of the tooth surface to be strengthened, the strengthening method further comprises:
cleaning the tooth surface of the gear by using a cleaning agent;
and drying the gear tooth surface subjected to the cleaning treatment.
3. The method according to claim 1, wherein the preset parameters include laser energy, laser pulse width and spot diameter, and the laser scanning the region to be strengthened according to the preset parameters includes:
and scanning the area to be strengthened by adopting a laser scanning device, wherein the laser energy is 4.8J-5.2J, the laser pulse width is 18 ns-20 ns, and the spot diameter is 2.1 mm-2.3 mm.
4. The strengthening method of claim 1, wherein the forming a constraining layer on a side of the protective layer facing away from the tooth surface during laser scanning comprises:
and spraying water flow to the area to be strengthened by using a nozzle in the laser scanning process so as to form a water restraint layer on the surface of the protective layer.
5. The method of strengthening according to claim 1, wherein the first range is 40% to 50%.
6. The strengthening method of claim 1, wherein the performance parameters include tooth surface hardness, residual compressive stress and depth of stress, and the detecting the performance parameters of the strengthened region and completing the strengthening when the performance parameters are in a second range comprises:
and respectively detecting the hardness, the residual compressive stress and the stress action depth of the strengthening region, and completing the strengthening when the hardness is greater than a first threshold value, the residual compressive stress is greater than a second threshold value and the stress action depth is in a specific range.
7. The strengthening method according to claim 6, wherein the first threshold value is 820HV, the second threshold value is 950MPa, and the specific range is 0.8mm to 1 mm.
8. The strengthening method of any one of claims 1-7, wherein the protective layer is an organic film layer, and removing the protective layer to form the strengthened region comprises:
and dissolving the organic film layer by adopting an organic solvent so that the organic film layer does not cover the area to be strengthened any more.
9. The method of claim 8, wherein the angle between the laser beam and the protective layer during laser scanning is between 30 ° and 45 °.
10. The method according to claim 8, wherein the distance between the position where the laser beam is emitted and the position where the laser beam contacts the protective layer is 505mm to 515 mm.
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| CN112708752A (en) * | 2020-12-15 | 2021-04-27 | 华南理工大学 | Method and device for strengthening gear surface through laser shot blasting |
| CN114113138A (en) * | 2021-11-22 | 2022-03-01 | 合肥维信诺科技有限公司 | Product registration detection device |
| CN114990323A (en) * | 2022-04-21 | 2022-09-02 | 河南机电职业学院 | Magnetic water double-constraint pulse laser shock strengthening method and system |
| CN116689779A (en) * | 2023-05-23 | 2023-09-05 | 汕头大学 | Manufacturing method of gradient gear and production equipment using same |
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| CN116689779A (en) * | 2023-05-23 | 2023-09-05 | 汕头大学 | Manufacturing method of gradient gear and production equipment using same |
| CN116689779B (en) * | 2023-05-23 | 2024-01-30 | 汕头大学 | Manufacturing method of gradient gear and production equipment using same |
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