CN111906438B - Follow-up laser shock peening device and method - Google Patents
Follow-up laser shock peening device and method Download PDFInfo
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- CN111906438B CN111906438B CN202010566761.9A CN202010566761A CN111906438B CN 111906438 B CN111906438 B CN 111906438B CN 202010566761 A CN202010566761 A CN 202010566761A CN 111906438 B CN111906438 B CN 111906438B
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- 230000035939 shock Effects 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 230000001360 synchronised effect Effects 0.000 claims abstract description 40
- 238000007664 blowing Methods 0.000 claims abstract description 28
- 238000005728 strengthening Methods 0.000 claims abstract description 25
- 239000007822 coupling agent Substances 0.000 claims abstract description 18
- 238000003062 neural network model Methods 0.000 claims description 32
- 238000004140 cleaning Methods 0.000 claims description 23
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- 238000004026 adhesive bonding Methods 0.000 claims description 19
- 238000003754 machining Methods 0.000 claims description 18
- 238000013528 artificial neural network Methods 0.000 claims description 16
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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Abstract
The invention relates to a follow-up laser shock peening device and a method thereof, wherein the follow-up laser shock peening device comprises a laser emitting unit, a laser processing unit and a follow-up laser shock peening unit, wherein the laser emitting unit is used for emitting laser and converging the laser; the laser shock strengthening unit is arranged below the laser emitting unit and used for supplying water to inject, and laser penetrates through the water to act on the synchronous moving unit; the synchronous moving unit is tightly pressed and attached to the lower end of the laser shock strengthening unit and attached to the workpiece; a coupling agent unit for adding a coupling agent between the synchronous moving unit and the workpiece; and the high-pressure air blowing unit is arranged between the coupling agent unit and the laser shock strengthening unit, and an air blowing opening is aligned to a workpiece positioned below the insulating tape. The problem of processing quality reduction caused by the fact that a water film is formed by spraying water on the side face when conventional laser shock peening is carried out is solved, the constraint layer is seriously affected by the edge or the raised structure, and once a part is arranged in a bent mode, a stable constraint layer is difficult to form.
Description
Technical Field
The invention relates to the technical field of material processing, relates to a laser shock peening technology, and particularly relates to a follow-up laser shock peening device and a follow-up laser shock peening method.
Background
Laser shock peening is an advanced surface treatment technique for modifying the surface of a material by using shock waves induced by strong laser.
During strengthening treatment, a plurality of lasers with GW/cm2 intensity penetrate through a transparent constraint layer (generally a water film) by adopting nanosecond pulse width, and act on an absorption layer (a black adhesive tape or an aluminum foil tape) tightly attached to a workpiece to generate high-temperature compact plasma; the plasma expands to generate a plurality of shock waves at GPa level, and the shock waves are coupled into a workpiece, so that plastic deformation and dislocation structures are generated in a certain area of the surface of the material to form residual compressive stress, and further the fatigue strength and the corrosion resistance of the part are improved. At present, the laser shock peening technology is widely applied to the fields of aviation, ships, mechanical engineering and the like, and is particularly used for anti-fatigue treatment of blades of aero-engines.
The above prior art solutions have the following drawbacks: during conventional laser shock peening treatment, a water film is formed by spraying water on the side surface, the constraint layer is seriously influenced by the edge or the raised structure, and once a part is arranged in a bent mode, the stable constraint layer is difficult to form, so that the processing quality is reduced, and the improvement space is provided.
Disclosure of Invention
The first purpose of the invention is to provide a follow-up laser shock peening device which has the characteristic of improving the processing quality of workpieces.
The above object of the present invention is achieved by the following technical solutions:
a follow-up laser shock peening apparatus includes:
the laser emitting unit is used for emitting laser and converging the laser;
the laser shock strengthening unit is arranged below the laser emitting unit and used for supplying water to inject, and laser penetrates through the water to act on the synchronous moving unit;
the synchronous moving unit is tightly pressed and attached to the lower end of the laser shock strengthening unit and attached to the workpiece, water flows out from the left side and the right side of the motion direction of the laser shock strengthening unit, and controls the laser emitting unit and the laser shock strengthening unit to move synchronously;
the coupling agent unit is arranged on the synchronous moving unit and adds the coupling agent between the synchronous moving unit and the workpiece;
and the high-pressure air blowing unit is arranged between the couplant unit and the laser shock strengthening unit and moves synchronously with the couplant unit and the laser shock strengthening unit, and an air blowing opening is aligned to a workpiece below the insulating tape.
Through adopting above-mentioned technical scheme, send and assemble laser through the laser emission unit, pass through laser shock strengthening unit confession laser simultaneously and pass through to act on the synchronous motion unit, and add the couplant through the couplant unit, reduce because of there being the processingquality defect that the space caused between protective layer and work piece surface, the water droplet is got rid of to the high pressure unit of blowing, does not have the space between messenger's protective layer, couplant, the work piece three, with the machining efficiency and the processingquality who improves holistic work piece.
The present invention in a preferred example may be further configured to: the laser shock peening unit includes:
the outer wall of the servo processing head is matched with the water inlet interface to supply water to flow out;
the water inlet interface is arranged on the outer wall of the servo processing head and is used for connecting an external water pipe for water injection;
the inner wall of the servo processing head is sleeved and fixed in the outer wall of the servo processing head and is used for controlling the depth of water;
and the window piece is arranged on one side of the inner wall of the servo processing head, which is close to the workpiece, and is mutually sealed and fixed with the inner wall of the servo processing head.
Through adopting above-mentioned technical scheme, adjust through the distance between follow-up processing head outer wall and the follow-up processing head inner wall to the thickness of inside water, and the window piece supplies laser to wear to establish, and the interface of intaking supplies the entering of outside water, thereby improves the holding power of holistic water.
The present invention in a preferred example may be further configured to: the synchronous mobile unit includes:
the compression rollers are provided with a plurality of supporting and connecting insulating tapes and are used for synchronous rotating matching of the insulating tapes;
the synchronous motor is used for controlling and driving at least one compression roller to rotate so as to drive the insulating tape to circularly move;
the insulating adhesive tape is arranged between the laser shock strengthening unit and the workpiece and used for tensioning the laser shock strengthening unit to enable water to be sprayed out from two sides;
the outer wall of the servo processing head is also provided with a guide cambered surface which is mutually guided with the insulating tape, and the guide cambered surface is arranged in the movement direction of the insulating tape.
Through adopting above-mentioned technical scheme, the compression roller supports and is taut with insulating sticky tape, and when insulating sticky tape transmitted the rotation simultaneously, reducing wear, synchronous machine will drive a compression roller and rotate to transmit, and insulating sticky tape carries out the shutoff with laser shock strengthening unit, thereby carries out temporary parcel with water, lies in the work piece simultaneously, thereby supplies the intensive impact of laser, and the practicality is strong.
The second purpose of the invention is to provide a follow-up laser shock peening method, which has the characteristic of improving the processing quality of workpieces.
The above object of the present invention is achieved by the following technical solutions:
a follow-up laser shock peening method adopts the follow-up laser shock peening device, and the shock peening method comprises the following steps:
acquiring current trigger information in a current detection area and current workpiece curvature information of the surface of a current workpiece to be machined;
controlling a booster pump to add water into the laser shock peening unit according to the current trigger information, controlling the synchronous moving unit to move synchronously, controlling the couplant unit to add the couplant into the synchronous moving unit, and controlling the high-pressure blowing unit to blow and clean the workpiece;
finding out the moving speed from a preset driving database according to the curvature information of the current workpiece, controlling the synchronous moving unit to move according to the moving speed, and controlling the couplant unit to add the couplant according to the moving speed;
finding out a water pressure value from a preset water pressure database according to the curvature information of the current workpiece, and controlling the working power of the booster pump according to the water pressure value;
and searching an air pressure value from a preset air pressure database according to the current workpiece curvature information, and controlling the working power of an air pump in the high-pressure air blowing unit according to the air pressure value so as to adjust the air blowing rate.
By adopting the technical scheme, whether the workpiece is started or not is judged by acquiring the current trigger information, the couplant and the movement are controlled by acquiring the current workpiece curvature information, and the water pressure value and the air blowing rate are synchronously adjusted so as to fit different curved surfaces.
The present invention in a preferred example may be further configured to: the method for adjusting the distance between the outer wall of the servo processing head and the window sheet in the laser shock peening unit comprises the following steps:
acquiring the current distance between the outer wall of the servo machining head and the window sheet;
searching out the current laser processing intensity from a preset laser intensity database according to the current distance and the preset laser injection energy;
controlling the distance between the outer wall of the servo machining head and the window sheet according to the comparison relationship between the current laser machining intensity and the preset current laser intensity of the current workpiece;
if the current laser processing intensity is larger than the current laser intensity of the current workpiece, increasing the distance; otherwise, the distance is reduced.
By adopting the technical scheme, the distance between the outer wall of the servo processing head and the window piece is detected, so that different laser processing strengths are judged, and the setting of different strengths is adopted, so that the distance between the outer wall of the servo processing head and the window piece is controlled, and the attenuation of laser is controlled.
The present invention in a preferred example may be further configured to: the method for acquiring the laser intensity database comprises the following steps:
step S1, obtaining the residual use intensity of the laser with the current intensity after passing through the current water depth;
step S2, changing and adjusting the current water depth, and not changing the laser with the current intensity to obtain a use intensity array;
step S3, replacing the laser adjusting the current intensity, and repeating the detection to update the using intensity array according to the steps S1-S2;
and step S4, outputting the updated usage intensity array to generate a laser intensity database.
By adopting the technical scheme, different lasers are obtained by using the current laser intensities at different depths, so that the attenuation conditions of the lasers in water at different depths are obtained, the intensity arrays are obtained after the laser intensities are changed, and a laser intensity database is generated.
The present invention in a preferred example may be further configured to: the acquisition mode of the driving database comprises the following steps:
acquiring an adhesion image of the insulating tape on the surface of the workpiece with the current curvature at different moving speeds and taking the adhesion image as a first sample image;
carrying out data cleaning on the first sample image, cutting the first sample image into preset image pixel values and preprocessing the preset image pixel values;
inputting the preprocessed first sample image into a neural network for training so as to learn the characteristic of judging whether the surface of the workpiece is bonded in a target area, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
obtaining the maximum moving speed under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the moving speed, and repeatedly obtaining the maximum moving speed under different curvatures;
the maximum movement rates at different curvatures are output to generate a drive database.
By adopting the technical scheme, the bonding condition under the current curvature at different moving speeds is obtained by judging the bonding image on the surface of the workpiece, and the bonding state is analyzed by comparing the pictures, so that the maximum moving speed under different curvatures is judged, and the overall efficiency is improved.
The present invention in a preferred example may be further configured to: the method for judging the addition amount of the coupling agent comprises the following steps:
obtaining a gluing image of the coupling agent on the insulating tape at different moving rates and taking the gluing image as a second sample image;
carrying out data cleaning on the second sample image, cutting the second sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed second sample image into a neural network for training to learn the characteristic that whether the coupling agent is fully paved in the target area or not, and selecting a neural network model with the accuracy rate which is greater than the preset accuracy rate in an accuracy rate curve graph;
obtaining the minimum gluing amount at the current moving speed from the neural network model, replacing and adjusting the current moving speed, and repeatedly obtaining the minimum gluing amount;
and outputting the maximum moving speed under different curvatures and the minimum gluing amount under the current maximum moving speed to generate a driving database.
By adopting the technical scheme, the gluing of the couplant under different moving speeds is judged in pairs, and the least gluing amount is obtained in an image comparison mode, so that the couplant is saved, and the maximum moving speed under different curvatures and the least gluing amount under the current maximum moving speed are comprehensively judged, so that real-time adjustment is performed.
The present invention in a preferred example may be further configured to: the method for acquiring the water pressure database comprises the following steps:
acquiring a bonding image of the insulating tape sprayed on the surface of the workpiece with the current curvature through different water pressure values and taking the bonding image as a third sample image;
carrying out data cleaning on the third sample image, cutting the third sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed third sample image into a neural network for training so as to learn the characteristic of judging whether the target area is attached to the surface of the workpiece or not, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
acquiring a minimum water pressure value under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the water pressure value, and repeatedly acquiring minimum water pressure values under different curvatures;
and outputting the minimum water pressure value under different curvatures to generate a water pressure database.
Through adopting above-mentioned technical scheme, through detecting the work piece to different curvatures to adjust water pressure value, thereby laminate insulating tape and work piece surface mutually, and through the mode of image contrast, thereby minimum water pressure value under the different curvatures, thereby save the water source.
The present invention in a preferred example may be further configured to: the method for acquiring the air pressure database comprises the following steps:
acquiring a cleaning image of water drops sprayed on the surface of the workpiece with the current curvature through different air pressure values and taking the cleaning image as a fourth sample image;
carrying out data cleaning on the fourth sample image, cutting the fourth sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed fourth sample image into a neural network for training so as to learn the characteristic of judging whether the target area has no water drops or not, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
acquiring a minimum air pressure value under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the air pressure value, and repeatedly acquiring minimum air pressure values under different curvatures;
and outputting the minimum air pressure value under different curvatures to generate an air pressure database.
Through adopting above-mentioned technical scheme, through detecting the work piece to different curvatures to adjust the atmospheric pressure value, thereby blow away the drop of water on workpiece surface, with the laminating of making things convenient for the later stage, and through the mode of image contrast, thereby obtain the minimum atmospheric pressure value under with different curvatures, thereby the energy can be saved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the processing quality of the workpiece is improved;
2. different curved surfaces are attached, and energy loss is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a follow-up laser shock peening apparatus.
Fig. 2 is a schematic diagram of a water path of the laser shock peening unit.
Fig. 3 is a schematic view of the flow of water between the outer wall of the servo machining head and the insulating tape.
Fig. 4 is a graph showing the degree of attenuation of laser light in water at various depths.
FIG. 5 is a flow chart of a method of follow-up laser shock peening.
Fig. 6 is a flow chart of a method of adjusting the distance between the outer wall of the servo machining head and the window plate.
Fig. 7 is a flow chart of a method of acquisition of a laser intensity database.
FIG. 8 is a flow chart of a method of driving the acquisition of a database.
FIG. 9 is a flowchart of a method for determining the amount of the coupling agent added.
Fig. 10 is a flowchart of a method of acquiring the hydraulic pressure database.
Fig. 11 is a flowchart of a method for acquiring the air pressure database.
In the figure, 1, a laser emitting unit; 10. a laser transmitter; 11. a focusing mirror; 2. a laser shock peening unit; 20. the outer wall of the servo machining head; 21. a water inlet interface; 22. the inner wall of the servo machining head; 23. a window sheet; 3. a synchronous mobile unit; 30. a compression roller; 31. a synchronous motor; 32. an insulating tape; 33. guiding the arc surface; 4. a coupling agent unit; 5. a high-pressure blowing unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
The embodiment of the invention provides a follow-up laser shock peening device which has the characteristic of improving the processing quality of a workpiece.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Referring to fig. 1, the follow-up laser shock peening apparatus includes a laser emitting unit 1, a laser shock peening unit 2, a synchronous moving unit 3, a coupling agent unit 4, and a high pressure blowing unit 5.
The laser emitting unit 1 is used for emitting laser and converging the laser, and the laser emitting unit 1 comprises a laser emitter 10 and a focusing mirror 11, the laser emitter 10 emits the laser, and the focusing mirror 11 converges the laser, so that the laser is used.
The laser shock peening unit 2 is arranged below the laser emitting unit 1 and water is injected, water is stored in the laser shock peening unit 2 and is used for laser to penetrate through the water, and therefore the laser shock peening unit acts on the synchronous moving unit 3.
Referring to fig. 1 and 2, the laser shock peening unit 2 includes a servo machining head outer wall 20, a water inlet port 21, a servo machining head inner wall 22, and a window piece 23. Wherein the outer wall 20 of the servo processing head is matched with the inner wall 22 of the servo processing head so as to control the depth of water, and the depth of the water is the distance from the window sheet 23 to the water outlet end of the outer wall 20 of the servo processing head.
The follower machining head outer wall 20 cooperates with the water inlet interface 21 for inflow of water and outflow of the lower end of the follower machining head outer wall 20. The water inlet port 21 is integrally formed on the outer wall 20 of the servo processing head and connected to an external water pipe to inject water, and when water is injected, water is pumped into the outer wall 20 of the servo processing head through a booster pump, so that a water outlet portion at the lower end of the outer wall 20 of the servo processing head ejects water with a certain pressure.
The window sheet 23 is arranged on one side of the inner wall 22 of the servo processing head close to the workpiece, and is mutually sealed and fixed with the inner wall 22 of the servo processing head, and can be reinforced by glue. And the inner wall 22 of the servo processing head is sleeved and fixed in the outer wall 20 of the servo processing head, and the depth of water is controlled by adjusting the distance between the inner wall and the outer wall.
Referring to fig. 4, the laser beam in this embodiment is a narrow beam and 1064 and 532 beams are used, where Ei is the laser light intake, Er is the laser energy after the transmission distance r, the volume attenuation coefficient C of the water is taken, C532 is 0.595, and C1064 is 14.7m-1, so that the obtained curve is Er/Ei = e-cr. The result shows that the water has great attenuation effect on the light of 1064; for 532 light, the attenuation effect is much smaller, but the attenuation effect is good, so the transmission distance of the laser in water is reduced, and the quality of the laser is improved. Therefore 532 green light is selected as the water guided laser.
Referring to fig. 1, the synchronous moving unit 3 includes a pressure roller 30, a synchronous motor 31, and an insulating tape 32.
The pressing roller 30 is provided in plurality and is used for supporting and connecting the insulating tape 32, and simultaneously, the insulating tape 32 is synchronously matched in rotation. At least one of the pressing rollers 30 is further provided with a synchronous motor 31, and the synchronous motor 31 can also drive the plurality of pressing rollers 30 to synchronously rotate, so that the pressing rollers 30 drive the insulating tapes 32 to circularly move.
The insulating tape 32 is arranged between the laser shock peening unit 2 and the workpiece and is tensioned upwards, so that a water outlet of the follow-up processing head outer wall 20 is wrapped, a guide cambered surface 33 which is mutually guided with the insulating tape 32 is further integrally formed on the follow-up processing head outer wall 20, and the guide cambered surface 33 is arranged in the moving direction of the insulating tape 32.
Referring to fig. 3, the outer wall 20 of the servo processing head and the insulating tape 32 are tightened with each other, at this time, water enters from the water inlet port 21 on the outer wall 20 of the servo processing head, is output from the lower end of the outer wall 20 of the servo processing head, and under the tightening force of the insulating tape 32, the insulating tape 32 is close to the workpiece and is ejected to both sides of the insulating tape 32, that is, the insulating tape 32 flows out from both the left and right sides in the moving direction of the insulating tape 32.
Referring to fig. 1, the couplant unit 4 is disposed on the synchronous moving unit 3, and applies the couplant to a side of the insulating tape 32 close to the workpiece, so that the insulating tape 32 is adhered to the surface of the workpiece under the pressure of water, and the adhesion release are performed on the workpiece along with the rotation of the synchronous motor 31. The insulating tape 32 is not attached to the surface of the workpiece, and the surface is smooth and free of dirt after treatment, so that the laser shock peening treatment process can be completed without performing front and rear treatment, the problem of unstable water film is solved, and the laser shock peening treatment can be performed with high efficiency.
The high-pressure air blowing unit 5 is arranged between the couplant unit 4 and the laser shock strengthening unit 2, so that before the surface of the workpiece is bonded with the couplant, water drops on the workpiece are blown off through the high-pressure air blowing unit 5 at an air blowing port of the high-pressure air blowing unit 5, and high-pressure air is provided through the air pump, so that the cleanliness of the surface of the workpiece is improved. The high-pressure air blowing unit 5 moves synchronously with the couplant unit 4 and the laser shock peening unit 2, and the air blowing openings are aligned with the workpieces positioned below the insulating tape 32.
Based on the same invention concept, the embodiment of the invention provides a follow-up laser shock peening method which has the characteristic of improving the processing quality of workpieces.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Referring to fig. 5, a follow-up laser shock peening method using the follow-up laser shock peening apparatus includes:
step 100: and acquiring current trigger information in the current detection area and current workpiece curvature information of the surface of the current workpiece to be machined.
The current trigger information is information about whether a workpiece is placed on the touch screen, and can be contacted through trigger elements such as an infrared sensor and a micro switch, and once the workpiece is detected to be placed on the touch screen, the trigger information is output. And the current curvature information of the workpiece is acquired through camera identification, and the acquired image is compared with a preset database, so that the current curvature is acquired.
Step 101: and controlling a booster pump to add water into the laser impact strengthening unit 2 according to the current trigger information, controlling the synchronous moving unit 3 to move synchronously, controlling the couplant unit 4 to add the couplant into the synchronous moving unit 3, and controlling the high-pressure air blowing unit 5 to blow air to clean the workpiece.
And subsequent units are controlled by judging the current trigger information. Once the workpiece is detected to be placed, the current trigger information is received, so that the booster pump is controlled to add water into the laser shock peening unit 2, the synchronous moving unit 3 is controlled to move synchronously, the couplant unit 4 is controlled to add the couplant into the synchronous moving unit 3, and the high-pressure air blowing unit 5 is controlled to blow air to clean the workpiece.
Step 102: and finding out the moving speed from a preset driving database according to the curvature information of the current workpiece, controlling the synchronous moving unit 3 to move according to the moving speed, and controlling the couplant unit 4 to add the couplant according to the moving speed.
And after receiving the current trigger information, acquiring the curvature information of the current workpiece, wherein the driving database is preset data. Finding out the moving speed from the driving database according to the curvature information of the current workpiece, controlling the synchronous moving unit 3 to move according to the moving speed, and controlling the couplant unit 4 to add the couplant according to the moving speed.
Step 103: and searching a water pressure value from a preset water pressure database according to the current workpiece curvature information, and controlling the working power of the booster pump according to the water pressure value.
And after receiving the current trigger information, acquiring the curvature information of the current workpiece, wherein the water pressure database is preset data. And searching a water pressure value from a water pressure database through the current workpiece curvature information, and controlling the working power of the booster pump according to the water pressure value.
Step 104: and searching an air pressure value from a preset air pressure database according to the current workpiece curvature information, and controlling the working power of an air pump in the high-pressure air blowing unit 5 according to the air pressure value to adjust the air blowing rate.
And after receiving the current trigger information, acquiring the curvature information of the current workpiece, wherein the air pressure database is preset data. And searching the air pressure value from the air pressure database according to the current workpiece curvature information, and controlling the working power of an air pump in the high-pressure air blowing unit 5 according to the air pressure value to adjust the air blowing rate.
Referring to fig. 6, the method for adjusting the distance between the outer wall 20 of the servo processing head and the window sheet 23 in the laser shock peening unit 2 includes the steps of:
step 200: the current distance between the follower machining head outer wall 20 and the window plate 23 is acquired.
The current distance is the distance between the outer wall 20 of the servo processing head and the window sheet 23, the current distance is detected, the outer wall 20 of the servo processing head is controlled through an external cylinder and other telescopic components, and the current distance is acquired through a control signal so as to obtain the distance between the outer wall and the window sheet.
Step 201: and searching the current laser processing intensity from a preset laser intensity database according to the current distance and the preset laser injection energy.
The laser intensity database is a database preset and collected by workers. The laser incident energy is preset laser, 532 green light is adopted in the embodiment, the laser processing intensity is found out from the current distance and laser intensity database, and the laser processing intensity is the actual intensity after passing through water.
Step 202: and controlling the distance between the outer wall 20 of the servo processing head and the window sheet 23 according to the comparison relationship between the current laser processing intensity and the preset current laser intensity of the current workpiece.
The current laser intensity of the current workpiece is preset intensity, and the working personnel control the laser energy according to actual requirements and store data. And comparing the current laser processing intensity with the current laser intensity of the current workpiece, and controlling the distance between the outer wall 20 of the servo processing head and the window sheet 23 according to the comparison size.
Step 203: if the current laser processing intensity is larger than the current laser intensity of the current workpiece, increasing the distance; otherwise, the distance is reduced.
Once the current laser processing intensity is larger than the current laser intensity of the current workpiece, increasing the distance; when the current laser processing intensity is smaller than the current laser intensity of the current workpiece, the distance is reduced; and when the current laser processing intensity is equal to the current laser intensity of the current workpiece, the distance is kept unchanged.
Referring to fig. 7, the method for acquiring the laser intensity database includes the following steps:
step S1: and acquiring the residual use intensity of the laser with the current intensity after the laser passes through the current water depth.
The energy is judged by detecting and judging the use intensity and judging the laser with the current intensity after passing through the current depth water.
Step S2: and replacing and adjusting the current water depth, and not replacing the laser with the current intensity so as to obtain a use intensity array.
After the collection is finished, the depth of the current water is adjusted, and the current laser intensity is not changed, so that the laser intensity under the depths of different water is obtained for collection, and a use intensity array is obtained.
Step S3: the laser adjusting the current intensity is replaced and the detection is repeated to update the use intensity array as per the steps in step S1-step S2.
After the laser acquisition of the first group is completed, the intensity of the laser may be adjusted so that the detection is repeated according to the steps of S1-S2, thereby updating the use intensity array.
Step S4: and outputting the updated using intensity array to generate a laser intensity database.
And outputting the updated using intensity array to generate a laser intensity database, thereby completing the improvement of the database.
Referring to fig. 8, the driving database obtaining method includes the following steps:
step 300: an adhesion image of the insulating tape 32 passing through different moving rates on the surface of the workpiece of the current curvature is acquired and taken as a first sample image.
A first sample image is acquired by the camera and is the data detected by the tape 32 at different moving speeds on the same curvature of the workpiece surface, and the resolution of the adhesive image is preferably 640 x 480.
Step 301: and carrying out data cleaning on the first sample image, cutting the first sample image into preset picture pixel values, and preprocessing the preset picture pixel values.
The data cleaning is to delete the repeated image, the overexposed image, the dark image, and the like. And cutting the qualified image into picture pixel values for processing, wherein the cutting process can also be processed in a manual framing mode.
Step 302: inputting the preprocessed first sample image into a neural network for training to learn the characteristic of judging whether the workpiece surface is bonded in the target area, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph.
The first sample image is input to the neural network, which is mainly used for learning, and the surface of the bonding workpiece in the target area is judged, once the speed is too high, the water pressure at this time cannot ensure the degree of the insulation tape 32 clinging to the workpiece, thereby causing the quality reduction. And meanwhile, when the neural network model is used, the model with the accuracy rate higher than the preset accuracy rate in the accuracy rate curve graph is selected, so that the accuracy is improved.
Step 303: and acquiring the maximum moving speed under the current curvature from the neural network model, and replacing and adjusting the current curvature to readjust the moving speed and repeatedly acquiring the maximum moving speed under different curvatures.
And obtaining the maximum moving speed under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the moving speed, and repeatedly obtaining the maximum moving speed under different curvatures so as to improve the overall moving speed.
Step 304: the maximum movement rates at different curvatures are output to generate a drive database.
And outputting the maximum moving speed under different curvatures to generate a driving database for later-stage adjustment of the data.
Referring to fig. 9, the method for determining the addition amount of the coupling agent includes the steps of:
step 400: a gummed image of the couplant on the insulating tape 32 at different rates of movement was taken and used as a second sample image.
A second sample image is acquired by the camera, and the second sample image is data detected by the degree of glue application of the couplant under different moving speeds of the insulating tape 32, and the resolution of the glue application image is preferably 640 × 480.
Step 401: and cleaning the data of the second sample image, cutting the second sample image into preset image pixel values and preprocessing the image pixel values.
The data cleaning is to delete the repeated image, the overexposed image, the dark image, and the like. And cutting the qualified image into picture pixel values for processing, wherein the cutting process can also be processed in a manual framing mode.
Step 402: inputting the preprocessed second sample image into a neural network for training to learn the characteristic that whether the insulating tape 32 is fully paved with the couplant in the target area, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in the accuracy rate curve graph.
And inputting the second sample image into a neural network, wherein the second sample image is mainly used for learning, and judging the state of the target area in which the couplant is fully spread, and the speed of the couplant coming out is too high, so that the whole waste is caused, and the coupling with the surface of the workpiece is not firm. And meanwhile, when the neural network model is used, the model with the accuracy rate higher than the preset accuracy rate in the accuracy rate curve graph is selected, so that the accuracy is improved.
Step 403: and obtaining the minimum gluing amount at the current moving speed from the neural network model, replacing and adjusting the current moving speed, and repeatedly obtaining the minimum gluing amount.
And obtaining the minimum gluing amount at the current moving speed from the neural network model, thereby saving the coupling agent, replacing and adjusting the current moving speed, and repeatedly obtaining the minimum gluing amount.
Step 404: and outputting the maximum moving speed under different curvatures and the minimum gluing amount under the current maximum moving speed to generate a driving database.
The maximum moving speed under different curvatures is obtained, the minimum gluing amount under the current maximum moving speed is also obtained, and the information of the maximum moving speed and the minimum gluing amount is output to generate a driving database after the information of the maximum moving speed and the minimum gluing amount is interacted, so that the speed is improved, and the use of a coupling agent is reduced.
Referring to fig. 10, the method for acquiring the water pressure database includes the following steps:
step 500: and acquiring a fitting image of the insulating tape 32 sprayed on the surface of the workpiece with the current curvature through different water pressure values and taking the fitting image as a third sample image.
And acquiring a third sample image through the camera, wherein the resolution of the bonding image is preferably 640 × 480, and the third sample image is data detected by the bonding degree between the insulating tape 32 and the workpiece under the condition that water with different water pressure values is sprayed on the surface of the workpiece with the current curvature.
Step 501: and cleaning the data of the third sample image, cutting the third sample image into preset image pixel values and preprocessing the image pixel values.
The data cleaning is to delete the repeated image, the overexposed image, the dark image, and the like. And cutting the qualified image into picture pixel values for processing, wherein the cutting process can also be processed in a manual framing mode.
Step 502: inputting the preprocessed third sample image into a neural network for training so as to learn the characteristic of judging whether the target area is attached to the surface of the workpiece, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph.
And inputting the third sample image into the neural network, wherein the third sample image is mainly used for learning, and judging the state of the insulating tape 32 attached to the workpiece in the target area, when the water pressure value is too large, the insulating tape 32 is attached to the workpiece, but the waste of energy and water resources can be caused, and the insulating tape 32 is not attached to the surface of the workpiece too seldom. And meanwhile, when the neural network model is used, the model with the accuracy rate higher than the preset accuracy rate in the accuracy rate curve graph is selected, so that the accuracy is improved.
Step 503: and acquiring the minimum water pressure value under the current curvature from the neural network model, and replacing and adjusting the current curvature to readjust the water pressure value and repeatedly acquiring the minimum water pressure value under different curvatures.
And acquiring the minimum water pressure value under the current curvature from the neural network model so as to save water and electricity, replacing and adjusting the current curvature to readjust the water pressure value and repeatedly acquire the minimum water pressure value under different curvatures, and repeatedly judging on workpieces with different curvatures.
Step 504: and outputting the minimum water pressure value under different curvatures to generate a water pressure database.
And collecting and recording the judged data, thereby generating a water pressure database for calling and using.
Referring to fig. 11, the method for acquiring the air pressure database includes the following steps:
step 600: and acquiring a cleaning image of the water drop sprayed on the surface of the workpiece with the current curvature through different air pressure values and taking the cleaning image as a fourth sample image.
And acquiring a fourth sample image through the camera, wherein the resolution of the fourth sample image is 640 × 480, and the fourth sample image is data detected by the cleaning condition of the workpiece surface under the condition that air with different air pressure values is sprayed on the workpiece surface with the current curvature.
Step 601: and cleaning the fourth sample image, cutting the fourth sample image into preset image pixel values, and preprocessing the image.
The data cleaning is to delete the repeated image, the overexposed image, the dark image, and the like. And cutting the qualified image into picture pixel values for processing, wherein the cutting process can also be processed in a manual framing mode.
Step 602: inputting the preprocessed fourth sample image into a neural network for training to learn the characteristic of judging whether the target area has no water drops, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph.
And inputting the fourth sample image into a neural network, wherein the fourth sample image is mainly used for learning, and judging the state of water drops on a workpiece in a target area, when the air pressure value is too large, the water drops on the workpiece are cleaned, but the waste of an electric energy source can be caused, and too few water drops on the surface of the workpiece can not be removed, so that the processing quality is influenced. And meanwhile, when the neural network model is used, the model with the accuracy rate higher than the preset accuracy rate in the accuracy rate curve graph is selected, so that the accuracy is improved.
Step 603: and acquiring the minimum air pressure value under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the air pressure value, and repeatedly acquiring the minimum air pressure values under different curvatures.
And acquiring the minimum air pressure value under the current curvature from the neural network model so as to save electricity, replacing and adjusting the current curvature to readjust the air pressure value, repeatedly acquiring the minimum air pressure values under different curvatures, and repeatedly judging on workpieces with different curvatures.
Step 604: and outputting the minimum air pressure value under different curvatures to generate an air pressure database.
And collecting and recording the judged data so as to generate an air pressure database for calling and using.
Claims (8)
1. A follow-up laser shock peening method is applied to a follow-up laser shock peening device, and the device comprises:
the laser emitting unit (1) is used for emitting laser and converging the laser;
the laser shock strengthening unit (2) is arranged below the laser emitting unit (1) and is used for supplying water and allowing laser to penetrate through the water to act on the synchronous moving unit (3);
the synchronous moving unit (3) is tightly pressed and attached to the lower end of the laser shock strengthening unit (2) and attached to a workpiece, water flows out from the left side and the right side of the motion direction of the laser shock strengthening unit (2), and controls the laser emitting unit (1) and the laser shock strengthening unit (2) to move synchronously;
the coupling agent unit (4) is arranged on the synchronous moving unit (3) and adds the coupling agent between the synchronous moving unit (3) and the workpiece;
the high-pressure air blowing unit (5) is arranged between the couplant unit (4) and the laser shock strengthening unit (2) and moves synchronously with the couplant unit (4) and the laser shock strengthening unit (2), and an air blowing opening is aligned to a workpiece below the insulating adhesive tape (32);
the impact strengthening treatment method comprises the following steps:
acquiring current trigger information in a current detection area and current workpiece curvature information of the surface of a current workpiece to be machined;
controlling a booster pump to add water into the laser shock peening unit (2) according to the current trigger information, controlling the synchronous moving unit (3) to move synchronously, controlling the couplant unit (4) to add the couplant into the synchronous moving unit (3), and controlling the high-pressure air blowing unit (5) to blow air to clean the workpiece;
finding out the moving speed from a preset driving database according to the curvature information of the current workpiece, controlling the synchronous moving unit (3) to move according to the moving speed, and controlling the couplant unit (4) to add the couplant according to the moving speed;
finding out a water pressure value from a preset water pressure database according to the curvature information of the current workpiece, and controlling the working power of the booster pump according to the water pressure value;
and searching an air pressure value from a preset air pressure database according to the current workpiece curvature information, and controlling the working power of an air pump in the high-pressure air blowing unit (5) according to the air pressure value to adjust the air blowing rate.
2. The method of claim 1,
the laser shock peening unit (2) includes:
the servo machining head outer wall (20) is matched with the water inlet interface (21) to supply water to flow out;
the water inlet interface (21) is arranged on the outer wall (20) of the servo machining head and is used for connecting an external water pipe for water injection;
the inner wall (22) of the servo processing head is sleeved and fixed in the outer wall (20) of the servo processing head and is used for controlling the depth of water;
the window piece (23) is arranged on one side, close to the workpiece, of the inner wall (22) of the follow-up processing head and is mutually sealed and fixed with the inner wall (22) of the follow-up processing head;
the method for adjusting the distance between the outer wall (20) of the servo processing head and the window sheet (23) in the laser shock peening unit (2) comprises the following steps:
acquiring the current distance between the outer wall (20) of the servo machining head and a window sheet (23);
searching out the current laser processing intensity from a preset laser intensity database according to the current distance and the preset laser injection energy;
controlling the distance between the outer wall (20) of the servo machining head and the window sheet (23) according to the comparison relation between the current laser machining intensity and the preset current laser intensity of the current workpiece;
if the current laser processing intensity is larger than the current laser intensity of the current workpiece, increasing the distance; otherwise, the distance is reduced.
3. The method of claim 2, wherein the obtaining of the laser intensity database comprises:
step S1, obtaining the residual use intensity of the laser with the current intensity after passing through the current water depth;
step S2, changing and adjusting the current water depth, and not changing the laser with the current intensity to obtain a use intensity array;
step S3, replacing the laser adjusting the current intensity, and repeating the detection to update the using intensity array according to the steps S1-S2;
and step S4, outputting the updated usage intensity array to generate a laser intensity database.
4. The method of claim 1, wherein the driving the database in a manner comprising:
acquiring a bonding image of the insulating tape (32) passing through the workpiece surface with the current curvature at different moving speeds and taking the bonding image as a first sample image;
carrying out data cleaning on the first sample image, cutting the first sample image into preset image pixel values and preprocessing the preset image pixel values;
inputting the preprocessed first sample image into a neural network for training so as to learn the characteristic of judging whether the surface of the workpiece is bonded in a target area, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
obtaining the maximum moving speed under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the moving speed, and repeatedly obtaining the maximum moving speed under different curvatures;
the maximum movement rates at different curvatures are output to generate a drive database.
5. The method as claimed in claim 4, wherein the method for determining the addition amount of the coupling agent comprises:
acquiring sizing images of the coupling agent on the insulating tape (32) at different moving rates and taking the sizing images as second sample images;
carrying out data cleaning on the second sample image, cutting the second sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed second sample image into a neural network for training to learn the characteristic that whether the insulating tape (32) is fully paved with the couplant in the target area or not, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
obtaining the minimum gluing amount at the current moving speed from the neural network model, replacing and adjusting the current moving speed, and repeatedly obtaining the minimum gluing amount;
and outputting the maximum moving speed under different curvatures and the minimum gluing amount under the current maximum moving speed to generate a driving database.
6. The method of claim 1, wherein the obtaining of the hydraulic database comprises:
acquiring a fit image of the insulating tape (32) sprayed on the surface of the workpiece with the current curvature through different water pressure values and taking the fit image as a third sample image;
carrying out data cleaning on the third sample image, cutting the third sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed third sample image into a neural network for training so as to learn the characteristic of judging whether the target area is attached to the surface of the workpiece or not, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
acquiring a minimum water pressure value under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the water pressure value, and repeatedly acquiring minimum water pressure values under different curvatures;
and outputting the minimum water pressure value under different curvatures to generate a water pressure database.
7. The method of claim 1, wherein the obtaining of the pressure database comprises:
acquiring a cleaning image of water drops sprayed on the surface of the workpiece with the current curvature through different air pressure values and taking the cleaning image as a fourth sample image;
carrying out data cleaning on the fourth sample image, cutting the fourth sample image into preset image pixel values and preprocessing the image pixel values;
inputting the preprocessed fourth sample image into a neural network for training so as to learn the characteristic of judging whether the target area has no water drops or not, and selecting a neural network model with the accuracy rate greater than the preset accuracy rate in an accuracy rate curve graph;
acquiring a minimum air pressure value under the current curvature from the neural network model, replacing and adjusting the current curvature to readjust the air pressure value, and repeatedly acquiring minimum air pressure values under different curvatures;
and outputting the minimum air pressure value under different curvatures to generate an air pressure database.
8. The method according to claim 1, characterized in that synchronizing the mobile units (3) comprises:
the compression roller (30) is provided with a plurality of supporting and connecting insulating tapes (32) and is used for synchronous rotating matching of the insulating tapes (32);
the synchronous motor (31) is used for controlling and driving at least one compression roller (30) to rotate so as to drive the insulating tape (32) to circularly move;
the insulating adhesive tape (32) is arranged between the laser shock strengthening unit (2) and the workpiece and is used for tensioning the laser shock strengthening unit (2) to enable water to be sprayed out from two sides;
the outer wall (20) of the follow-up processing head is also provided with a guide cambered surface (33) which is mutually guided with the insulating tape (32), and the guide cambered surface (33) is arranged in the movement direction of the insulating tape (32).
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| US6333488B1 (en) * | 1999-08-30 | 2001-12-25 | General Electric Company | Method for setting up and controlling confinement media flow in laser shock peening |
| US7148448B2 (en) * | 2003-10-31 | 2006-12-12 | General Electric Company | Monitored laser shock peening |
| US7906746B2 (en) * | 2005-11-30 | 2011-03-15 | General Electric Company | Laser shock peening system with time-of-flight monitoring |
| CN101249588B (en) * | 2008-03-14 | 2011-01-05 | 江苏大学 | Sheet material double face precise forming method and apparatus based on laser blast wave effect |
| CN103343190B (en) * | 2013-07-19 | 2014-12-03 | 江苏大学 | Laser shock enhancement device adopting macromolecular restraint layer |
| CN103614541B (en) * | 2013-10-31 | 2015-08-19 | 中国科学院宁波材料技术与工程研究所 | For laser impact intensified device and the laser impact intensified treatment process of workpiece surface |
| CN108262563B (en) * | 2016-12-30 | 2023-10-24 | 宁波大艾激光科技有限公司 | Follow-up laser shock peening device and method |
| CN108296639B (en) * | 2016-12-30 | 2023-10-24 | 宁波大艾激光科技有限公司 | Follow-up laser shock peening device |
| CN108796206B (en) * | 2018-06-20 | 2019-12-03 | 江苏大学 | A kind of the compound curved surface intensifying device and method of laser-impact and ultrasonic vibration |
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