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WO2018120361A1 - Dispositif de type suiveur pour le traitement de martelage par choc laser - Google Patents

Dispositif de type suiveur pour le traitement de martelage par choc laser Download PDF

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Publication number
WO2018120361A1
WO2018120361A1 PCT/CN2017/073493 CN2017073493W WO2018120361A1 WO 2018120361 A1 WO2018120361 A1 WO 2018120361A1 CN 2017073493 W CN2017073493 W CN 2017073493W WO 2018120361 A1 WO2018120361 A1 WO 2018120361A1
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WO
WIPO (PCT)
Prior art keywords
module
water
water spray
follow
laser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/073493
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English (en)
Chinese (zh)
Inventor
张文武
茹浩磊
黄亿辉
王斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Iii Lasers Technology Co Ltd
Ningbo Institute of Material Technology and Engineering of CAS
Original Assignee
Ningbo Iii Lasers Technology Co Ltd
Ningbo Institute of Material Technology and Engineering of CAS
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Filing date
Publication date
Application filed by Ningbo Iii Lasers Technology Co Ltd, Ningbo Institute of Material Technology and Engineering of CAS filed Critical Ningbo Iii Lasers Technology Co Ltd
Publication of WO2018120361A1 publication Critical patent/WO2018120361A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
    • 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
    • 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
    • B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
    • 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
    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Definitions

  • the invention belongs to the field of material processing, and relates to a laser shock peening technology, in particular to a follow-up laser shock reinforced processing system for various complex shaped workpiece surfaces.
  • Laser Shocking Peening is a high-intensity (GW/cm 2 order), short-pulse (10 to 30 ns) pulsed laser impact material that produces a strong laser-induced plasma on the surface of the material.
  • the GPA-level shock wave generated by the blasting acts on the surface of the material and propagates to the inside, causing plastic deformation and complex dislocation structure in a certain area of the material surface, forming a large residual compressive stress, and improving the fatigue strength and corrosion resistance of the part.
  • this technology has been widely used in various fields such as mechanical engineering, aerospace, microelectronics, national defense, and medical.
  • the laser shock peening technology is a technique in which an ultra-high voltage shock wave generated by a strong laser is applied to a surface of a workpiece for laser shock peening.
  • laser shock peening technology has been widely used in aviation, shipbuilding, mechanical engineering and other fields, especially for anti-fatigue treatment of aircraft engine blades.
  • Existing laser shock reinforced devices for workpiece surfaces include a laser generating unit, an absorbing protective layer on the surface of the workpiece, and a constraining layer on the surface of the absorbing protective layer.
  • the function of the constraining layer is to allow the laser energy to pass through and act on the absorbing protective layer, while also providing as much as possible the reaction force during plasma expansion to improve the shock wave coupling efficiency.
  • a solid material such as optical glass is generally used as a constraining layer, or a flexible material such as a water film is used as a transparent constraining layer.
  • the main function of the absorbing protective layer is to protect the workpiece from laser burns and enhance the absorption of laser energy. Paint, flexible tape or metal foil of a certain thickness or the like is generally used as an absorbing protective layer.
  • black lacquer has good adhesion to various irregular surfaces, and the disadvantage is that it is sprayed. After that, you need to wait for it to dry before you can apply the constraining layer for impact strengthening.
  • the production efficiency is low; if the aluminum foil is applied, the adhesion to chamfers and irregular surfaces is not good, which affects the quality of reinforcement.
  • a light-water coaxial follow-up laser shock reinforced device and method which adopt a follow-up absorption belt conveying method, and a certain pressure of water is sprayed through a water spray module.
  • the absorption belt is in close contact with the workpiece, and as the motor rotates, the laser impact treatment conveys the absorption belt at the same time, and the laser shock strengthening treatment process for the workpiece surface can be completed. Since the absorption belt used in the present invention is not attached to the surface of the workpiece, and the surface is smooth and free from other dirt, the laser shock strengthening treatment can be completed without post-processing, and the laser impact strengthening treatment is performed with high order and high efficiency.
  • the device includes an optical path input module, a tape feeding module, a focusing module, and a water spray module;
  • the optical path input module is connected to and is connected to the light source, the other end is connected to the focusing module and the optical path is connected; the other end of the focusing module is connected to the water spray module; the feeding module includes a motor and a transmission The mechanism and the absorption belt, the motor drives the absorption belt to move through a transmission mechanism, and the absorption belt passes through a water column ejected by the water spray module.
  • the motor is a synchronous motor, and a step frequency of the synchronous motor is consistent with an impact enhancement working frequency of the follow-up laser shock peening device.
  • the synchronous motor drives the absorption belt to move a distance.
  • the distance that the absorption band moves each laser pulse can be determined by those skilled in the art according to the processing requirements of the workpiece to be processed and the ablation range of the laser irradiation during laser shock.
  • the tape feeding module comprises an absorption belt fixing structure fixedly connected to a water spray outlet of the water spray module, and the absorption belt fixing structure fixes a moving direction of the absorption belt at The water jet is sprayed out of the center of the water column.
  • the absorption belt fixing structure is a part of the water spout outlet of the water spray module.
  • the absorption belt fixing structure is an absorption belt restraining structure of a water spout outlet portion of the water spray module.
  • the absorbing belt fixing structure is a two-slot gap formed by the side wall of the water sprinkler nozzle portion of the water spray module to form an absorption band restraining structure.
  • the absorption band penetrates from one of the slits and passes through the water column ejected by the water spray module from the other gap
  • the absorption belt fixing structure fixes the moving direction of the absorption belt to the center of the water column sprayed by the water spray module.
  • the absorption belt may be a smooth soft film strip which is dark in color, does not contain an adhesive layer, and is not easily broken.
  • the absorption belt can be selected from a smooth soft film strip which is dark in color, does not contain an adhesive layer, and is not easily broken.
  • the absorbent tape has a thickness of from 0.01 mm to 0.5 mm of flexible film tape.
  • the absorbent strip has a thickness of 0.1 mm.
  • the absorption band has an absorption rate of laser light of at least one of 10640 nm, 1064 nm, 800 nm, 532 nm, 517 nm, and 355 nm of not less than 95%.
  • the absorption band has an absorption rate of laser light having a wavelength of 355 nm to 10640 nm of not less than 95%.
  • the absorption band has an absorption rate of 95% to 99.99% for laser light of at least one of 10640 nm, 1064 nm, 800 nm, 532 nm, 517 nm, and 355 nm.
  • the absorbent tape has a tensile strength greater than 30 N/cm.
  • the absorption band has a tensile strength ranging from 30 N/cm to 3000 N/cm.
  • the absorbent tape has a tensile strength ranging from 30 N/cm to 300 N/cm and a thickness of from 0.01 mm to 0.5 mm.
  • the absorption band has a thickness of from 0.01 mm to 0.2 mm.
  • the surface of the absorbent belt is free of an adhesive layer.
  • the pulsed laser has a wavelength of 10640 nm, 1064 nm, 800 nm, 532 nm, 517 nm, and/or 355 nm.
  • the transmission mechanism includes at least one delivery wheel and at least one tensioning wheel.
  • the transmission mechanism includes a first conveying wheel, a first tensioning wheel, a second conveying wheel on one side of the device, and a third conveying wheel, a second tensioning wheel, and a third conveying wheel on the other side of the device.
  • a fourth conveying wheel the absorption belt is sequentially driven by the motor to pass through the first conveying wheel, the first tensioning wheel, the second conveying wheel, the nozzle outlet end of the water spray module, the third conveying wheel, and the third Two tensioning wheels and a fourth conveying wheel.
  • the delivery wheel or the tensioning wheel may be a fixed wheel or a moving wheel or other smooth member or the like.
  • the focusing module can convert the rotary motion into an up-and-down linear motion through a bevel gear mechanism, a bevel gear mechanism, a cam mechanism or the like, thereby ensuring precise fine adjustment of the focusing mirror.
  • the impact head can be set thin and long without affecting the processing quality, and can be subjected to surface strengthening treatment at a concealed portion that cannot be reached by conventional laser impact processing.
  • the optical path input module comprises a connecting plate, a positioning pin, an optical path adjusting block, an elastic adjusting sleeve and a mirror;
  • the connecting plate connects the laser or the optical fiber to the elastic adjusting sleeve through the positioning pin,
  • An elastic adjustment sleeve is elastically coupled to the optical path adjustment block, the optical path adjustment block being coupled to the device, the mirror being fixed to the device and reflecting light emitted by the laser or the optical fiber;
  • the optical path input The module adjustment output optical path is coaxial with the water column ejected by the water spray module.
  • the focusing module comprises a knob, a self-lubricating sleeve, a casing, a connecting sleeve, a focusing mirror and a focusing frame; the focusing frame fixing the focusing mirror to the self-lubricating bushing; the self-lubricating The sleeve is slid axially along the outer casing by the knob to focus the light.
  • the apparatus comprises an imaging module, the imaging module comprising a CCD image sensor and a mounting sleeve, the CCD image sensor being reflective to the optical path input module by an axial movement of the mounting sleeve a mirror end; the mirror is light transmissive to a side of the CCD image sensor, and the mirror is reflective toward a side of the laser or the optical fiber.
  • the CCD refers to a charge coupled device (English name: Charge-coupled Device).
  • the water spray module comprises a spray head, and the water outlet end side wall of the spray head has two slits disposed opposite to form an absorption belt fixing structure, and the absorption belt penetrates from one of the slits and passes through the water spray The water column ejected by the module is then passed out from another gap; the absorption belt fixing structure fixes the moving direction of the absorption belt to the center of the water column ejected by the water spray module.
  • the absorption belt fixing structure fixes the moving direction of the absorption belt to the center of the water column sprayed by the water spray module, which means that the laser spot and the central axis of the coaxial water column can be directed to the absorption band. Central.
  • the water spray module comprises a protective lens, a water spray sleeve, a water inlet pipe, a mounting nut sleeve, and a spray head;
  • One end of the water spray sleeve is fixed with the protective lens and connected to the light exiting direction of the focusing module, and the other end of the water spray sleeve is screwed to the nozzle by the mounting nut sleeve;
  • the lens separates the water spray module from the space of the focusing module;
  • the water inlet pipe is disposed on a side wall of the water spray sleeve.
  • the device includes a collision avoidance module disposed between the focusing module and the water spray module, the collision avoidance module including a protective collar, a mounting nut sleeve and a nut pressing ring;
  • the protective collar is elastically deformable, and is mounted between the focusing module and the water spray module by the mounting nut sleeve and the nut pressing ring to buffer shock and vibration received by the water spray module.
  • the device includes a controller electrically connected to the light source and the synchronous motor, and the controller controls a step frequency of the synchronous motor and the follow-up laser shock reinforced device Impact strengthening The working frequency is the same.
  • the device comprises a pressure tank, a water pump and a gas generator
  • the controller is electrically connected to the water pump and a gas generator
  • the pressure tank is connected to the water jet module
  • the controller is passed through a water pump And a gas generator to control the water pressure in the pressure tank.
  • the beneficial effects that can be produced by the present application include: the follow-up laser impact reinforced device provided by the present application adopts a follow-up metal foil or black tape as an absorbing layer, which can be edge-impacted and slanted, due to Absorbed into the surface of the workpiece, there is no other material on the surface of the workpiece, no post-processing is required, and the laser shock strengthening treatment is superior in high order and high efficiency.
  • FIG. 1 is a cross-sectional view of a front view of a follow-up laser shock peening apparatus according to an embodiment of the present application.
  • FIG. 2 is a cross-sectional view of a left side view of a follow-up laser shock peening apparatus according to an embodiment of the present application.
  • FIG 3 is a front view of a follow-up laser shock peening apparatus according to an embodiment of the present application.
  • FIG. 4 is a left side view of a follower laser shock reinforced device according to an embodiment of the present application.
  • FIG. 5 is a right side view of a follow-up laser shock reinforced device according to an embodiment of the present application.
  • FIG. 6 is a top plan view of a follow-up laser shock peening device according to an embodiment of the present application.
  • Figure 7 is a bottom plan view of a follow-up laser shock peening apparatus according to an embodiment of the present application.
  • FIG. 8 is a perspective view of a follow-up laser shock peening device according to an embodiment of the present application.
  • FIG. 9 is a perspective view of a follow-up laser shock peening apparatus according to an embodiment of the present application.
  • Figure 10 is a partial enlarged view of the nozzle of an embodiment of the present application.
  • FIG. 11 is a partially enlarged three-dimensional picture of a nozzle according to an embodiment of the present application.
  • Figure 12 is a partial enlarged view of the nozzle of an embodiment of the present application.
  • FIG. 13 is a connection diagram of a follow-up laser shock reinforced device system according to an embodiment of the present application.
  • the follow-up laser impact enhancement device includes an optical path input module 2 , a tape feeding module 4 , a focusing module 6 , a collision avoidance module 7 , an imaging module 8 , and Water spray module 9.
  • One end of the optical path input module 2 (the optical path entrance end of FIG. 1) is connected and introduced to the light source, and the other end (the lower end of the mirror 28 of FIG. 1) is connected to the focusing module 6 and communicated with the optical path.
  • the other end of the focusing module 6 is connected to the water spray module 9 through the collision avoidance module 7 (see Fig. 2).
  • the imaging module 8 is located at the top of the device, and its optical path can be observed through the mirror 28 to observe the spot on the bottom of the device.
  • the optical path input module 2 includes a connecting plate 20 , a positioning pin 22 , an optical path adjusting block 24 , an elastic adjusting sleeve 26 , and a mirror 28 .
  • the connecting plate 20 connects the laser or the optical fiber to the elastic adjusting sleeve 26 through the positioning pin 22.
  • the elastic adjusting sleeve 26 is elastically connected to the optical path adjusting block 24, and the optical path adjusting block 24 is adjustablely connected with the device connected, and can be connected to the light. Two-dimensional motion on a plane perpendicular to the axis to adjust the light path, see Figure 8.
  • the mirror 28 is fixed to the optical path input module 2 and reflects the light emitted by the laser or the optical fiber.
  • the optical path input module 2 is capable of adjusting the optical path of its output to be coaxial with the water column ejected by the water spray module 9.
  • the focusing module 6 includes a knob 60, a self-lubricating sleeve 62, a housing 63, a slip ring 64, a focusing mirror 66, a connecting sleeve 67, a focusing frame 68, and a positioning pin 69.
  • the focusing frame 68 fixes the focusing mirror 68 to the self-lubricating bushing 62, and the self-lubricating bushing 62 slides along the outer casing 62 in the direction of the knob 60 to focus the light.
  • the focus mirror 66 is moved by the knob 60 to change the position of the focused laser spot.
  • the adjustment is fine and flexible, and the adjustable range is 10 mm to 20 mm with an accuracy of 0.05 mm.
  • the water spray module 9 includes a protective lens 90, a water inlet nozzle 92, a mounting nut sleeve 94, a spray head 96, and a water spray sleeve 98.
  • the upper end of the water spray sleeve 98 is fixed with a protective lens 90 and is connected to the connecting sleeve 67 of the focusing module 6, and the light exiting direction passes through the protective lens 90.
  • the protective lens 90 will have a space and a lower portion of the upper optical path shown in FIG. The space of the water chamber is separated.
  • the lower end of the water spray sleeve 98 is threadedly coupled to the spray head 96 by a mounting nut sleeve 94.
  • a water inlet pipe 92 is provided on the side wall of the water spray sleeve 98 for connecting the water source.
  • the water outlet end side wall of the nozzle 96 has two slits disposed opposite to each other, forming an absorption belt fixing structure 46 of the tape feeding module 4, and an enlarged view is shown in FIG. 11 and FIG.
  • One of the slits penetrates through the water jet ejected from the water spray module and passes through the other slit (the enlarged cross-sectional view of the absorption belt fixing structure 46 is shown in FIG. 10), so that the absorption belt 44 can only follow the route defined by the slit.
  • FIG. 7 is a bottom view of the follow-up laser shock peening device, it can be seen that the absorption band penetrates through the gap of the fixing structure 46 and passes through.
  • the device includes an anti-collision module 7 disposed on the focusing module 6 and spraying water.
  • the anti-collision module 7 includes a protective collar 70, a mounting nut sleeve 72 and a nut pressing ring 74.
  • the protective collar 70 is elastically deformable, and is mounted between the connecting sleeve 67 of the focusing module 6 and the water spray module 9 through the mounting nut sleeve 72 and the nut pressing ring 74 to buffer the shock and vibration received by the water spray module.
  • the protective collar 70 is made of an elastic material, typically made of elastic nylon plastic.
  • the tape feeding module 4 includes a synchronous motor 40 , four conveying wheels and two tensioning wheels (the conveying wheel 420 , the conveying wheel 422 , the conveying wheel 424 , the conveying wheel 426 , The tensioning wheel 428 and the tensioning wheel 429) and the absorption belt 44, the synchronous motor 40 drives the absorption belt 44 through the conveying wheel and the tensioning wheel in the transmission mechanism 42, and the absorption belt 44 passes through the nozzle 96 of the water spraying module 9.
  • the absorption band formed by the slit fixes the structure 46 and passes through the water column ejected from the showerhead 96. Please refer to FIG. 3, FIG. 4 and FIG. 5 for the specific structure of the tape feeding module 4.
  • the step frequency of the synchronous motor 40 coincides with the impact enhancement operating frequency of the follow-up laser shock peening device.
  • the synchronous motor 40 drives the absorption belt 44 forward a distance, moves the portion of the absorption band 44 that has been laser-irradiated out of the center of the showerhead 96, and moves the new length of absorption band 44 to the showerhead 96. Centered to prepare for the next laser pulse.
  • the distance that the absorption band 44 moves each laser pulse can be determined according to the size of the spot and the ablation range of the laser light irradiated on the absorption band during the laser shock.
  • the absorbent tape 44 may be selected from aluminum foil tapes and other metal foil tapes, and may also be selected from darker colored organic polymer tapes, preferably black tapes that do not contain an adhesive glue layer, typically 0.15 mm thick black PVC.
  • the width of the absorbent band 44 does not exceed the outer diameter of the showerhead 96 and can pass through the slits in the showerhead 96 (absorbent tape securing structure 46).
  • the apparatus includes an imaging module 8 including a CCD image sensor 80 and a mounting sleeve 82.
  • the CCD image sensor 80 is vertically adjustable by a mounting sleeve 82 and coupled to the mirror of the optical path input module 2.
  • the upper end of 28 is shown in Figure 6.
  • the CCD image sensor 80 is height-adjustable, which can improve the positioning accuracy and is convenient for observation.
  • the mirror 28 reflects one side of the transmission, and the side facing the CCD image sensor 80 can transmit light for observing the spot and adjusting the position with the optical path input module 2 and adjusting the focus with the focusing module 6.
  • the mirror 28 reflects light toward one side of the laser or the optical fiber and is directed coaxially toward the water column ejected by the showerhead 96.
  • the system connection diagram of the follow-up laser shock reinforced device of the present application is as shown in FIG. 13 , and the device further includes a computer, a controller, a pressure tank, a water pump, a gas generator, a pressure gauge, a flow meter, and the controller
  • the optical device, the synchronous motor, the water pump and the gas generator are electrically connected, and the pressure tank is connected to the water inlet pipe 92, and the pressure gauge and the flow meter are located on the water pipe directly connected to the pressure tank and the water inlet pipe 92.
  • the controller is electrically connected to the water pump and the gas generator, the controller controls the water pressure in the pressure tank through a water pump and a gas generator under the program control of the computer .
  • the controller controls, under the program control of the computer, that the step frequency of the synchronous motor is controlled to be consistent with the impact enhancement working frequency of the follow-up laser shock peening device.
  • the laser shock absorbing device passes through a transparent constraining layer by using a short laser pulse (generally within 50 nanoseconds) and a high power density (GW/cm 2 level) laser (this application) It is water) which acts on the absorption belt 44 of the surface of the workpiece.
  • Absorbing protective layer The absorption band 44 absorbs the laser energy and rapidly vaporizes to form a dense high-temperature, high-pressure plasma. The plasma continues to absorb the laser energy and then rapidly heats up and expands to form a shock wave.
  • the shock wave intensity can reach several GPa (10 9 Pa) is much higher than the yield strength of many workpiece materials; the shock wave passes through the absorbing protective layer, acts on the surface of the workpiece and propagates to the inside of the workpiece, causing plastic deformation and residual compressive stress field on the surface of the workpiece, resulting in plastic surface material. Shape deformation, increased dislocation density, resulting in grain refinement, compressive stress and hardness, thereby significantly improving the material's fatigue resistance, wear resistance and corrosion resistance.
  • the laser shock strengthening operation steps of the follow-up laser shock tensing device of the present application are as follows:
  • the laser beam is coaxially passed through the water chamber in the water spray unit and the water column sprayed from the spray head to the absorption belt which is close to the surface of the workpiece in step a), and is subjected to laser shock reinforcement;
  • step b) the device moves relative to the workpiece to the next impact site, while the motor drives the absorption band to move beyond the laser spot, repeating the laser shock enhancement process of step b).
  • the deionized water enters the water spray sleeve 98 from the water inlet pipe 92 to form a water chamber, and is ejected from the outlet at the bottom of the water jet 96.
  • the laser is connected to the device through a connecting plate 20, and the laser beam is adjusted via the optical path input module 2, reflected by the mirror 28, and then irradiated onto the focusing mirror 66. After the beam passes through the focusing mirror 66, the protective lens 90 is passed through the protective lens 90.
  • the coaxial jet is directed toward the water chamber formed in the water spray sleeve 98 and the water column ejected from the spray head 96, and then is totally confined to the area bounded by the water column.
  • the laser shock strengthening process requires a water column diameter of 0.5 mm to 1.5 mm and a water column length (distance between the processing plane and the lower surface of the protective lens 90) of 15 mm to 20 mm, the laser can achieve multiple reflections in the water column, thereby realizing The control of the mean field and spot size of the beam.
  • the synchronous motor 40 has the same frequency as the impact-strengthening operation, and once the shock is applied, the synchronous motor pulls the absorption belt 44 to go. As shown in FIG.
  • the upper end of the stepping motor 40 is provided with a Feeding device.
  • the belt feeding device is provided with a belt feeding gear, a belt feeding gear and a belt bearing connection, and a feeding end part fixing nut fixing belt feeding device, the feeding belt device is provided with a feeding port on one side, and the other end of the belt feeding device The outlet is provided on the side, as shown in Figure 1.
  • the belt feeding system has a simple structure and is convenient to use, and can adjust the tightness of the feeding belt. As long as the hand presses the feeding end part to press the spring, the material can be refueled, and the structure is flexible and can be changed, and can be changed into a near-end feeding according to its own needs. Device.
  • the gear is subjected to the action of the elastic member and the limit guide block, and the absorption belt 44 is pressed by the gear to abut against the rolling bearing. Due to the sliding friction between the absorption belt 44 and the rolling bearing, when the gear rotates, the belt is driven to move between the gear and the bearing. Then, the step frequency of the synchronous motor 40 is set to be consistent with the pulse laser shock enhancement working frequency, and finally, the pulse laser impact is once performed, and the synchronous motor pulls the absorption belt 44 forward for a period of time.
  • the connecting plate 20 of the optical path input module 2 can also be matched with the fiber laser, and can be widely applied to various materials and various complicated workpiece surfaces for laser impact strengthening treatment. Extending the service life of the workpiece is a cost-effective production and analysis product.
  • the follow-up laser shock peening device of the present application reduces the parameter fluctuation caused by the application mode of the existing water confinement layer by means of coaxiality of light and water, thereby improving the stability and flexibility of the processing.
  • the laser beam is constrained and shaped by the total reflection of the light beam entering the air from the surface.
  • the kinetic energy of water is used to enhance the restraining effect of the water constraining layer.
  • the technical solution of the present application reduces the parameter fluctuation caused by the application mode of the existing water confinement layer by means of light water coaxiality, and improves the stability and flexibility of the processing.
  • the laser beam is constrained and shaped by the total reflection when the light beam is injected into the air from the water surface.
  • the kinetic energy of water is used to enhance the restraining effect of the water constraining layer.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un dispositif de type suiveur pour le martelage par choc laser, comprenant un module d'entrée de trajet de lumière (2), un module de transport à courroie (4), un module de focalisation (6) et un module de pulvérisation d'eau (9). Une extrémité du module d'entrée de trajet de lumière (2) est connectée à, et introduit, une source de lumière, et l'autre extrémité de celui-ci est connectée à, et en communication de trajet de lumière avec, le module de focalisation (6). L'autre extrémité du module de focalisation (6) est reliée au module de pulvérisation d'eau (9). Le module de transport à courroie (4) comprend un moteur électrique (40), un mécanisme de transmission (42) et une courroie d'absorption (44). Le moteur électrique (40) entraîne le mouvement de la courroie d'absorption (44) au moyen du mécanisme de transmission (42), et la courroie d'absorption (44) passe à travers une colonne d'eau pulvérisée par le module de pulvérisation d'eau (9). Le dispositif de martelage par choc laser utilise un procédé de transport à courroie d'absorption de type suiveur et présente l'avantage de réaliser un traitement de martelage par choc laser d'une manière hautement ordonnée et hautement efficace.
PCT/CN2017/073493 2016-12-30 2017-02-14 Dispositif de type suiveur pour le traitement de martelage par choc laser Ceased WO2018120361A1 (fr)

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CN111906438B (zh) * 2020-06-19 2022-04-15 宁波大艾激光科技有限公司 一种随动式激光冲击强化处理装置及其方法
CN114559162B (zh) * 2021-12-22 2025-03-25 哈尔滨理工大学 一种激光加工硬质合金刀具刃口强化的设备及方法
CN115747471B (zh) * 2022-10-28 2025-07-11 中国科学院宁波材料技术与工程研究所 一种双向可控法向夹角的激光冲击强化装置

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