Search

CN-122007544-A - Device and method for manufacturing electric pulse auxiliary laser shock enhanced arc fuse additive

CN122007544ACN 122007544 ACN122007544 ACN 122007544ACN-122007544-A

Abstract

The invention discloses an electric pulse auxiliary laser shock reinforcement arc fuse additive manufacturing device and method, comprising an arc fuse additive module for depositing metal wires layer by layer on a substrate, a high-frequency pulse current module for injecting pulse current into a deposition area after solidification of the deposition layer, and a laser shock reinforcement module for emitting pulse laser to the same deposition area after the action of the pulse current and forming shock waves on the surface of a workpiece, wherein the pulse current is injected into the same area after solidification of the deposition layer through the high-frequency pulse current module, the laser shock reinforcement module emits laser to generate shock waves, and a coaxial ectopic coupling motion module enables an arc welding gun, a current injection electrode and a laser head to be linked along with a deposition path to realize deposition-electric pulse-laser shock online continuous coupling.

Inventors

  • WU HAONAN
  • XU BINBIN
  • MA MINGHUA
  • HUANG KE
  • LAI DAOGUI
  • ZHANG YONGCAI
  • LI RAN

Assignees

  • 西安交通大学
  • 中国航发南方工业有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (8)

  1. 1. An electrical pulse assisted laser shock and arc fuse additive composite fabrication apparatus comprising: an arc fuse additive module (1) for depositing metal wires layer by layer on a substrate; a high-frequency pulse current module (2) for injecting pulse current into the deposition area after the deposition layer is solidified; The laser shock strengthening module (3) is used for emitting pulse laser to the same deposition area after the action of the pulse current and forming shock waves on the surface of the workpiece (4); The high-frequency pulse current module (2) has the capability of outputting the following two electric pulse parameters in a time-sharing way: (a) Confining plasma pulse, which is used for inducing a circumferential magnetic field on the surface of a molten pool before laser emission so as to pinch the laser-induced plasma; (b) And the heat treatment pulse is used for increasing the temperature in the surface layer of the deposition layer to the alloy solid solution or aging interval so as to realize interlayer in-situ heat treatment.
  2. 2. The apparatus of claim 1, wherein the high-frequency pulse current module (2) comprises a pair of discharge electrodes (21), the discharge electrodes (21) are in sliding contact with the surface of the deposition layer, and the confining plasma pulse and the heat treatment pulse are sequentially output.
  3. 3. The device as claimed in claim 2, wherein the front end of the discharge electrode (21) is a copper-chromium-zirconium alloy ring with a diameter of 3-8 mm, and the cooling mode is compressed air side blowing.
  4. 4. The device according to claim 1, wherein the laser shock peening module (3) uses a Nd: YAG nanosecond laser.
  5. 5. A method of using an electric pulse assisted laser shock peening arc fuse additive manufacturing apparatus according to any one of claims 1 to 4, comprising the steps of: step 1), a three-dimensional model is built for a workpiece (4) through computer CAD software, and slicing layering and path planning are carried out on the three-dimensional model through additive manufacturing system software; step 2), performing single-pass deposition by using an arc fuse additive module (1); step 3), when the temperature of the deposition layer is cooled to be below the metal solidus temperature of +50 ℃, the high-frequency pulse current module (2) outputs a confined plasma pulse, and pulse current is injected into the deposition area for the duration of 1-5 ms; Step 4), within 30-100 mu s of time after the end of the confined plasma pulse, the laser shock strengthening module (3) emits pulse laser to the same deposition area to form shock waves with peak pressure more than or equal to 1.5 GPa; After the impact is finished, the high-frequency pulse current module (2) is switched into heat treatment pulse, so that the surface layer of the deposition layer reaches the solid solution temperature of the alloy at the heating rate of 50-150 Ks -1 and is insulated by 5-15 s, and then the self-quenching is finished at the cooling rate of 80-200 Ks -1 after power is off; step 6) repeating steps 2) to 5) until the whole workpiece 4 is completed.
  6. 6. The method of claim 5, wherein the repetition rates of the confined plasma pulses and the heat treatment pulses are independent of each other and are each automatically switched by the same controller in a "confined-impingement-solvus-quench" sequence.
  7. 7. The method of claim 5, wherein the confined plasma pulse induces a toroidal magnetic field at the surface of the molten pool of 0.2-0.5T, the radial dimension of the laser plasma plume is compressed by not less than 30%, and the laser energy transmittance is improved by not less than 20%.
  8. 8. The method of claim 5, wherein the overall "constraint-impact-solid solution-quench" cycle time is reduced over a single layer fabrication cycle without the need for subsequent in-furnace solid solution or aging treatments.

Description

Device and method for manufacturing electric pulse auxiliary laser shock enhanced arc fuse additive Technical Field The invention relates to the technical field of metal additive manufacturing and surface strengthening, in particular to an electric pulse auxiliary laser shock strengthening arc fuse additive manufacturing device and method. Background Metal additive manufacturing is a technology for manufacturing three-dimensional metal entities by adding materials layer by layer, and is widely focused in the field of high-end equipment such as aerospace and the like. The arc fuse additive manufacturing (WAAM) has the advantages of high deposition efficiency, low equipment cost and the like, but has the problems of coarse grains, high porosity, large residual tensile stress and the like, so that the fatigue life of a workpiece is low. Laser Shock Peening (LSP) can introduce residual compressive stress on the surface, but traditional LSP is off-line secondary processing, has low efficiency and limited reinforcement depth, and is easy to relax under high-temperature service. In recent years, the electro-plastic effect has been proved to reduce dislocation de-nailing energy and promote grain refinement, but no report has been made on the application of high-frequency electric pulse and laser shock wave coupling to WAAM processes. Patent application (publication number CN 114686676B) entitled "method for real-time coupling strengthening of electric pulse and laser shock wave" discloses that by regulating and controlling the starting time and duration of electric pulse and laser shock wave, the electric pulse and laser shock wave form instant synergistic effect on the surface layer of material, so as to implement synchronous optimization of plastic lifting and strength enhancement. However, the above solution only involves the auxiliary regulation and control of the electric pulse on the laser shock strengthening process, and the processing object is usually a formed metal workpiece, and the electric pulse auxiliary laser shock coupling field is not introduced into the arc fuse additive manufacturing process, so that the electric pulse is not utilized to restrain the laser plasma to improve the shock energy utilization rate, and the electric pulse is not used as a heat source to complete the solid solution-quenching-aging cycle online, so that the double problems of plasma shielding and subsequent furnace heat treatment chain length in the WAAM layer-by-layer forming process cannot be solved. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide an electric pulse assisted laser shock reinforced arc fuse additive manufacturing device and method, wherein high-frequency pulse current and laser shock waves are applied in the deposition process, and triple effects of 'fine grains + closed pores + deep residual compressive stress' are realized by utilizing electric-electric coupling, so that the porosity and the surface roughness of a metal printing workpiece are remarkably reduced, the fatigue life is prolonged, and the manufacturing period is shortened. In order to achieve the above object, the present invention is realized by the following technical scheme: an electrical pulse assisted laser shock peening arc fuse additive manufacturing apparatus comprising: an arc fuse additive module 1 for depositing a metal wire layer by layer on a substrate; a high-frequency pulse current module 2 for injecting pulse current into the deposition area after the deposition layer is solidified; the laser shock strengthening module 3 is used for emitting pulse laser to the same deposition area after the action of the pulse current and forming shock waves on the surface of the workpiece 4; The high-frequency pulse current module 2 has the capability of outputting the following two electric pulse parameters in a time-sharing way: (a) Confining plasma pulse, which is used for inducing a circumferential magnetic field on the surface of a molten pool before laser emission so as to pinch the laser-induced plasma; (b) And the heat treatment pulse is used for increasing the temperature in the surface layer of the deposition layer to the alloy solid solution or aging interval so as to realize interlayer in-situ heat treatment. The high-frequency pulse current module 2 comprises a pair of discharge electrodes 21, wherein the discharge electrodes 21 are in sliding contact with the surface of the deposition layer, and a confined plasma pulse and a heat treatment pulse are sequentially output. The front end of the discharge electrode 21 is a copper-chromium-zirconium alloy ring with the diameter of 3-8 mm, and the cooling mode is compressed air side blowing. The laser shock strengthening module 3 adopts an Nd-YAG nanosecond laser. The method for utilizing the electric pulse auxiliary laser shock to strengthen the arc fuse additive manufacturing device comprises the following steps of: Step 1), a