Laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device and method

Abstract

The invention discloses a laser wire feeding additive-layer impact peening composite manufacturing device and method, and the device comprises an additive manufacturing module, an environment control module, a movement conversion module, an impact peening module and an integrated control system. The integrated control system is connected with the additive manufacturing module, the environment control module, the movement conversion module and the impact strengthening module through signal lines, state signals of all the modules are collected and analyzed in real time, operation instructions are given according to the preset process and logic, and it is ensured that all the modules are tightly matched and efficiently run. The advantages of the laser coaxial wire feeding technology and synchronous layer-by-layer laser shock peening are combined, the workpiece forming quality and precision are guaranteed, meanwhile, the macromechanical property of a workpiece is improved, in the laser shock peening process, a common flowing water limiting layer is abandoned, the electric shock risk caused by the flowing water limiting layer and the pollution problem to the workpiece are avoided, and the production efficiency is improved. The simplicity and the safety of the manufacturing device are obviously improved, and the production efficiency and the operation convenience are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser additive manufacturing, and more specifically, relates to a composite manufacturing device and method for laser wire feeding additive - layer - by - layer shock strengthening. Background Art

[0002] Wire Laser Additive Manufacturing (WLAM) uses a high - energy laser beam to heat the wire material to a molten or semi - molten state, and deposits the wire material on the processing platform through a coaxial nozzle according to the single - layer planning path generated by the slicing software, and finally deposits layer by layer to form a workpiece with a certain height and shape. Compared with other additive manufacturing technologies, the significant advantages of wire laser additive manufacturing are as follows: (1) There is no powder waste, pollution, or recycling, and the cost is low; (2) The high energy density of the laser beam makes the melting and solidification processes of the raw materials more precise, thus obtaining a high - precision processing effect; (3) It has a high processing speed and can meet the requirements of high - efficiency processing. Therefore, additive manufacturing based on wire laser additive manufacturing can be widely applied in industrial manufacturing fields such as aerospace, automotive manufacturing, electronics industry, shipbuilding, petrochemical industry, etc., and has considerable development potential and value.

[0003] However, the further application and popularization of this technology are restricted by the forming performance of the workpiece, which is mainly reflected in: (1) The "melting - cooling - solidification" transformation during the rapid prototyping process causes the existence of residual stress, non - uniform microstructure, and metallurgical defects in the workpiece, resulting in anisotropy of the mechanical properties of the workpiece or introducing the origin points of mechanical failure in the workpiece; (2) When depositing the next layer, it is inevitable to generate a heat - affected zone of "re - melting" on the previous deposited layer. The grains in this area are often coarse and the microstructure is non - uniform, which macroscopically shows a significant decrease in the mechanical properties of the workpiece. Laser shock peening of the additively formed workpiece can use the high shock wave pressure generated by a pulsed high - power - density laser beam to cause plastic deformation on the workpiece surface, induce the generation of a compressive residual stress layer, and form a high - density and uniformly distributed dislocation in the grain interior to refine the grains. These microstructural transformations are all beneficial to improving the macroscopic mechanical properties of the workpiece. Compared with laser shock peening of the whole additively manufactured workpiece, performing laser shock peening on the deposited layer in real - time and layer by layer during additive manufacturing helps to generate a high - density dislocation and mechanical twin at the interface of the deposited layer, providing more nucleation points for the subsequent deposited layer and growing into equiaxed recrystallized grains, thereby enhancing the strength and ductility of the workpiece. Summary of the Invention

[0004] In view of the above deficiencies or improvement requirements of the prior art, the present invention provides a composite manufacturing device and method for laser wire feeding additive manufacturing - layer - by - layer impact strengthening. Through an additive manufacturing module, an environment control module, a mobile conversion module, an impact strengthening module, and an integrated control system, it can achieve the integration of workpiece forming - strengthening equipment. The additive manufacturing module creates a closed environment in the additive manufacturing chamber, which is paired with a laser coaxial wire feeding additive manufacturing head and a wire feeding mechanism to precisely control the wire feeding and laser melting processes and achieve efficient workpiece forming. The environment control module works in coordination with a vacuum system and a protective gas delivery device to quickly create a low - oxygen inert gas environment, laying a solid quality foundation for the forming and strengthening processes. The mobile conversion module uses a manufacturing platform transition chamber and supporting hatches and slide rails to enable the additive manufacturing platform to move smoothly in different areas and seamlessly connect the formed workpiece to the impact strengthening module. The impact strengthening module uses a series of precision components to perform precise strengthening treatment on the workpiece. The integrated control system is like the "intelligent brain" of the entire device, closely connected to each module through signal lines, collecting and analyzing the status signals of each module in real - time, and issuing operation instructions according to preset processes and logics to ensure the close cooperation and efficient operation of each module.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a composite manufacturing device for laser wire feeding additive manufacturing - layer - by - layer impact strengthening, including an additive manufacturing module, an environment control module, a mobile conversion module, an impact strengthening module, and an integrated control system, wherein:

[0006] The additive manufacturing module includes an additive manufacturing chamber, inside which there are a laser coaxial wire feeding additive manufacturing head, a wire feeding mechanism, and an additive manufacturing platform. The laser coaxial wire feeding additive manufacturing head and the wire feeding mechanism are fixedly installed on the top surface inside the additive manufacturing chamber, and the laser coaxial wire feeding additive manufacturing head is connected to the wire feeding mechanism. The additive manufacturing platform is arranged on the bottom surface inside the additive manufacturing chamber, and its top is provided with a flat plate for performing movements in the three directions of the x - y - z axes to implement the printing of deposition paths.

[0007] The environment control module includes a vacuum system and a protective gas delivery device fixedly installed on the right side surface inside the additive manufacturing chamber. The protective gas delivery device is connected to a gas cylinder, and the gas cylinder is arranged outside the additive manufacturing chamber.

[0008] The mobile conversion module includes a manufacturing platform transition chamber. There is a first hatch between the manufacturing platform transition chamber and the additive manufacturing chamber, and a second hatch is provided on its left side. The bottom surfaces inside the additive manufacturing chamber and the manufacturing platform transition chamber are fixedly installed with movement slide rails, and one end of the slide rails inside the additive manufacturing chamber is slidably connected to the additive manufacturing platform.

[0009] The impact strengthening module is arranged outside the transition cabin of the manufacturing platform. It includes a first column, a second column, a laser shock strengthening head, and a moving device. An impact strengthening platform is fixedly installed in the upper-middle part of the first column. A restraint layer fixture is arranged on the upper part of the impact strengthening platform and is slidably connected to the first column. The second column is slidably connected with a platform distance measuring device, and the platform distance measuring device is connected to the impact strengthening platform. The laser shock strengthening head is arranged on the moving device;

[0010] The integrated control system is arranged on the outer side wall of the transition cabin of the manufacturing platform and serves as the central control unit of the entire additive manufacturing system. It is connected to the additive manufacturing module, the environment control module, the mobile conversion module, and the impact strengthening module through signal lines.

[0011] Further, a restraint layer placement area is arranged in the middle of the restraint layer fixture. The restraint layer used in the restraint layer placement area is a glass or quartz sheet with a thickness of 3-5 mm, high light transmittance, high hardness, and strong impact resistance.

[0012] Further, the impact strengthening module further includes an absorption layer arranged on the workpiece. The absorption layer needs to be manually laid on the upper part of the workpiece. The absorption layer includes, but is not limited to, aluminum foil or black tape.

[0013] Further, during the additive manufacturing process, the first hatch and the second hatch cannot be opened simultaneously. When the first hatch is opened, the second hatch must be closed. Move the additive manufacturing platform to the transition cabin of the manufacturing platform, close the first hatch, open the second hatch, and move the substrate and the deposited workpiece on the flat plate outside the platform transition cabin.

[0014] Further, the platform distance measuring device can monitor the height of the workpiece on the impact strengthening platform and transmit the monitoring information to the impact strengthening platform, so that the restraint layer fixture can automatically lift and lower to a height that fits the surface of the workpiece.

[0015] Further, the moving device includes track support frames arranged around the impact strengthening platform. Longitudinal movement tracks are fixedly installed on the left and right track support frames. A transverse movement track is slidably connected between the two longitudinal movement tracks. A vertical movement track is vertically slidably connected to the transverse movement track, and a laser shock strengthening head is fixedly installed at the lower end of the vertical movement track.

[0016] Further, the total power of the laser coaxial wire feeding additive manufacturing head can be set to 200W, 400W, 600W, 800W, 1000W, or 1200W. The laser wavelength is 976nm, the scanning speed is 12-18 mm / s, the wire feeding speed is 16-22 mm / s, and the diameter of the wire accommodated is 0.8-1.2 mm.

[0017] Further, the pulsed laser of the laser shock peening head has a wavelength of 1064 nm, a working frequency of 5 Hz, a maximum pulse energy of 15 J, a pulse width of 15 - 20 ns, a spot diameter of 3 - 10 mm, an overlap rate of 50 - 70%, and the energy distribution of the laser beam is Gaussian distribution.

[0018] Further, the gas cylinder is filled with a protective atmosphere, and the protective atmosphere includes, but is not limited to, argon, helium, or an argon-helium mixture.

[0019] According to the second aspect of the present invention, there is provided a composite manufacturing method of laser wire feeding additive - layer - by - layer shock peening, characterized in that it is realized by applying the composite manufacturing device of laser wire feeding additive - layer - by - layer shock peening, and includes:

[0020] S100: First, sequentially start the integrated control system, the additive manufacturing module, the environment control module, the mobile conversion module, and the shock peening module. Place the substrate on the flat plate, and through the integrated control system, turn on the vacuum system to evacuate the additive manufacturing chamber to a vacuum state, and then start the protective gas delivery device to deliver the protective atmosphere to the additive manufacturing chamber;

[0021] S200: Set the planned path of additive manufacturing forming on the integrated control system, and set the relevant process parameters of additive manufacturing according to the material and workpiece requirements. Subsequently, through the integrated control system, control the laser coaxial wire feeding additive printing head and the wire feeding mechanism to melt and deposit the metal material layer by layer on the substrate of the additive manufacturing platform;

[0022] S300: When the first layer of metal deposition is completed, open the door of the additive manufacturing chamber through the integrated control system, move the additive manufacturing platform and the flat plate into the manufacturing platform transition chamber, close the first door, and open the second door;

[0023] S400: Move the substrate and the metal deposition layer on the flat plate to the shock peening platform, attach an absorption layer to its surface, and select a suitable confinement layer to be installed at the confinement layer placement location. Through the integrated control system, operate the platform ranging device to detect the distance between the metal deposition layer and the confinement layer placement location. Subsequently, control the automatic movement of the confinement layer fixture to attach the confinement layer to the absorption layer of the deposition layer;

[0024] S500: Set the planned path of laser shock peening on the integrated control system, and set the relevant process parameters of laser shock peening according to the process requirements. Then, start the laser shock peening head to perform shock peening on the deposited layer metal;

[0025] S600: After the laser shock peening is completed, remove the absorption layer on the metal deposition layer. Then, transfer the substrate together with the metal deposition layer to the additive manufacturing platform. Move the additive manufacturing platform to the manufacturing platform transfer cabin through the integrated control system, close the second hatch, open the first hatch, and move the additive manufacturing platform into the additive manufacturing cabin, and then close the second hatch;

[0026] S700: Turn on the vacuum system through the integrated control system, evacuate the additive manufacturing cabin to a vacuum state. Then, start the protective gas delivery device to deliver the protective gas into the additive manufacturing cabin. Subsequently, continue with the procedure in step S200 to deposit the next layer of metal;

[0027] S800: Repeat steps S300 to S700 to perform metal deposition and laser shock peening layer by layer until the forming and strengthening of the entire workpiece are completed.

[0028] Generally speaking, compared with the prior art, the above technical solution conceived by the present invention can achieve the following beneficial effects:

[0029] 1. The composite manufacturing device of the present invention, through the additive manufacturing module, the environmental control module, the mobile conversion module, the shock strengthening module and the integrated control system, can realize the integration of the workpiece forming-strengthening equipment. The additive manufacturing cabin in the additive manufacturing module creates a closed environment, which is paired with a laser coaxial wire feeding additive manufacturing head and a wire feeding mechanism to accurately control the wire feeding and laser melting processes, and realize the efficient forming of the workpiece; the environmental control module cooperates with the vacuum system and the protective gas delivery device to quickly create a low-oxygen inert gas environment, laying a solid quality foundation for the forming and strengthening processes. The mobile conversion module uses the manufacturing platform transfer cabin and the supporting hatches and slide rails to enable the additive manufacturing platform to move smoothly in different areas, seamlessly connecting the formed workpiece to the shock strengthening module. The shock strengthening module uses a series of precision components to perform precise strengthening treatment on the workpiece. The integrated control system is like the "intelligent brain" of the entire device, which is closely connected to each module through signal lines, collects and analyzes the status signals of each module in real time, and issues operation instructions according to the preset processes and logics to ensure the close cooperation and efficient operation of each module.

[0030] 2. The composite manufacturing device of the present invention, by using a glass or quartz sheet as the confinement layer and avoiding using a conventional circulating water supply system to make a flowing water confinement layer, effectively solves the problems of flowing water splashing during the laser shock process damaging mechanical equipment and optical lenses and polluting the production environment. The glass or quartz sheet as the confinement layer can inhibit the expansion of the laser-induced plasma, increase the shock wave pressure and duration, thereby improving the effect of laser shock peening. The installation and replacement process of the glass confinement layer is simple and fast. With the platform ranging device and the confinement layer fixture that can move up and down, the height position of the confinement layer can be automatically adjusted, further reducing the complexity and operation difficulty of the equipment.

[0031] 3. The composite manufacturing device of the present invention realizes the efficient forming of workpieces through the laser coaxial wire feeding technology, and can manufacture complex structural parts with good appearance quality and high precision. At the same time, the device adopts a layer-by-layer synchronous laser shock peening method. Compared with traditional laser shock peening, it can eliminate the tensile residual stress generated layer by layer in the workpiece to the greatest extent, refine the grains, improve the non-uniformity of the microscopic tissue structure. The integrated forming and strengthening process can significantly improve the macroscopic mechanical properties of the workpiece. In addition, the formed workpiece does not need to be subjected to subsequent optimization modification or shaping post-treatment, reducing the production process and manufacturing cycle. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a composite manufacturing device for laser wire feeding additive - layer - by - layer shock strengthening according to an embodiment of the present invention;

[0033] Figure 2 It is a schematic flow diagram of a composite manufacturing method for laser wire feeding additive - layer - by - layer shock strengthening according to an embodiment of the present invention.

[0034] In all the drawings, the same reference numerals represent the same technical features. Specifically: 1 - additive manufacturing chamber, 2 - laser coaxial wire feeding additive manufacturing head, 3 - wire feeding mechanism, 4 - additive manufacturing platform, 5 - flat plate, 6 - vacuum pumping system, 7 - protective gas delivery device, 8 - gas cylinder, 9 - first hatch, 10 - motion slide rail, 11 - manufacturing platform transition chamber, 12 - second hatch, 13 - shock strengthening platform, 131 - first column, 14 - absorption layer, 15 - platform distance measuring device, 151 - second column, 16 - restraint layer fixture, 17 - restraint layer placement location, 18 - laser shock peening head, 19 - moving device, 191 - track support frame, 192 - transverse motion track, 193 - longitudinal motion track, 194 - vertical motion track, 20 - integrated control system. Detailed Embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if the descriptions such as "first", "second", etc. are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] In this patent, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not preclude the presence of additional identical elements in the process, method, article or device comprising the said elements.

[0039] Embodiment 1

[0040] As Figure 1 shown, an embodiment of the present invention provides a composite manufacturing device for laser wire feeding additive - layer - by - layer impact strengthening, including an additive manufacturing module, an environment control module, a movement conversion module, an impact strengthening module and an integrated control system 19, wherein:

[0041] The additive manufacturing module includes an additive manufacturing chamber 1, which provides a closed environment for the entire additive manufacturing process, is conducive to gas protection, reduces interference from the external environment to the manufacturing process, such as dust, humidity, etc., thereby improving the quality and stability of additive manufacturing. At the same time, the closed environment is also conducive to safety protection and reduces operation risks; inside the additive manufacturing chamber 1, there are a laser coaxial wire feeding additive printing head 2, a wire feeding mechanism 3, and an additive manufacturing platform 4. The laser coaxial wire feeding additive printing head 2 and the wire feeding mechanism 3 are fixedly installed on the top surface inside the additive manufacturing chamber 1, and the laser coaxial wire feeding additive printing head 2 is connected to the wire feeding mechanism 3, capable of achieving precise wire feeding control and a stable laser melting process, improving the efficiency and quality of additive manufacturing. Compared with other wire feeding methods, the coaxial wire feeding method can better ensure the stability of the molten pool, reduce molten pool fluctuations, thereby improving the forming accuracy and surface quality.

[0042] Furthermore, the total power of the laser coaxial wire feeding additive manufacturing head 2 can be set to 200W, 400W, 600W, 800W, 1000W or 1200W. The laser wavelength is 976nm, the scanning speed is 12 - 18mm / s, the wire feeding speed is 16 - 22mm / s, and the diameter of the wire accommodated is 0.8 - 1.2mm.

[0043] Furthermore, the additive manufacturing platform 4 is arranged on the bottom surface inside the additive manufacturing chamber 1. It is internally provided with a multi-axis robotic arm, and a flat plate 5 is fixedly connected to the top of the multi-axis robotic arm. Precise control of the X - Y - Z axes is achieved through the multi-degree-of-freedom movement of the multi-axis robotic arm. It can not only move flexibly in the X - Y plane but also lift in the Z - axis direction to implement the printing of the deposition path.

[0044] The environmental control module includes a vacuum system 6 and a protective gas delivery device 7 fixedly installed on the right side inside the additive manufacturing chamber 1. The protective gas delivery device 7 is connected to a gas cylinder 8, and the gas cylinder 8 is arranged outside the additive manufacturing chamber 1. Through the coordinated action of the vacuum system 6 and the protective gas delivery device 7, an inert gas environment with low oxygen can be quickly established inside the additive manufacturing chamber. The vacuum system can quickly exhaust the air inside the chamber to reduce the oxygen content, while the protective gas delivery device fills the chamber with a protective atmosphere through the gas cylinder 8. Additive manufacturing can be carried out under the protection of the protective atmosphere, which can effectively avoid material oxidation and contamination, thereby improving the surface quality and internal microstructure properties of the formed parts. The external setting of the gas cylinder 8 makes it more convenient to replace the gas cylinder, and at the same time, different types of protective gases can be flexibly selected according to different material and process requirements.

[0045] The protective atmosphere includes, but is not limited to, argon, helium or argon - helium mixture. The protective atmosphere can isolate the air, prevent oxidation reactions during the printing process, and at the same time help to stabilize the molten pool, reduce the generation of defects such as pores and cracks, and improve the density and mechanical properties of the printed parts.

[0046] The mobile conversion module includes a manufacturing platform transition cabin 11, which provides an independent transition area for the additive manufacturing platform, enabling the additive manufacturing cabin 1 to focus on the manufacturing process, while the transition cabin 11 is used for the movement and subsequent processing of the platform, improving the overall utilization rate of the equipment. A first hatch 9 is provided between the manufacturing platform transition cabin 11 and the additive manufacturing cabin 1, and a second hatch 12 is provided on its left side. Both the first hatch 9 and the second hatch 12 can slide up and down to open and close, effectively isolating the internal environments of the additive manufacturing cabin 1 and the manufacturing platform transition cabin 11. Movement slide rails 10 are fixedly installed on the bottom surfaces inside the additive manufacturing cabin 1 and the manufacturing platform transition cabin 11. One end of the movement slide rails 10 inside the additive manufacturing cabin 1 is slidably connected to the additive manufacturing platform 4, enabling the additive manufacturing platform 4 to automatically move between the additive manufacturing cabin 1 and the transition cabin 11 through the movement slide rails 10, realizing seamless connection between the additive manufacturing process and the subsequent processing or transfer process, reducing manual intervention, and improving production efficiency.

[0047] Further, during the additive manufacturing process, the first hatch 9 and the second hatch 12 cannot be opened simultaneously. When the first hatch 9 is opened, the second hatch 12 must be closed. Move the additive manufacturing platform 4 to the manufacturing platform transition cabin 11, close the first hatch 9 and open it, then open the second hatch 12, and move the flat panel 5 outside the platform transition cabin 11, which can effectively prevent external air from entering the additive manufacturing cabin 1, thereby maintaining the purity of the atmosphere inside the cabin, and thus improving production efficiency and safety.

[0048] The impact strengthening module is arranged outside the manufacturing platform transition cabin 11. It includes a first upright column 131. An impact strengthening platform 13 is fixedly installed in the upper middle part of the first upright column 131. A limiting layer fixture 16 is arranged on the upper part of the impact strengthening platform 13 and is slidably connected to the first upright column 131. A limiting layer placement area 17 is arranged in the middle of the limiting layer fixture 16. The limiting layer used in the limiting layer placement area 17 is a glass or quartz sheet with a thickness of 3 - 5 mm, having high light transmittance, high hardness, and strong impact resistance, to inhibit the expansion of the laser-induced plasma, increase the shock wave pressure and duration. For example, K9 optical glass can significantly increase the peak pressure of the shock wave by a principle similar to that of the flowing water limiting layer.

[0049] Further, a second upright column 151 is fixedly installed on the front side of the impact strengthening platform 13. A platform distance measuring device 15 is slidably connected to the second upright column 151. The platform distance measuring device 15 is connected to the impact strengthening platform 13 and is used to monitor the height of the workpiece on the impact strengthening platform 13, and then transmit a signal to the impact strengthening platform 13, so that the limiting layer fixture 16 will automatically lift to a height that fits the surface of the workpiece.

[0050] Furthermore, the impact strengthening module further includes an absorption layer 14, which is arranged on the upper part of the workpiece. When the workpiece is taken off the flat plate 5 and placed on the impact strengthening platform 13, it is necessary for the operator to lay the absorption layer 14 on the upper part of the workpiece. The absorption layer 14 includes, but is not limited to, aluminum foil or black tape, and is used to prevent the vaporization and evaporation of metal materials.

[0051] Furthermore, the impact strengthening module further includes a moving device 19. The moving device 19 includes track support frames 191 arranged around the impact strengthening platform 13. Longitudinal movement tracks 193 are fixedly installed on the left and right track support frames 191. A transverse movement track 192 is slidably connected between the two longitudinal movement tracks 193. A vertical movement track 194 is vertically slidably connected to the transverse movement track 192. A laser shock strengthening head 18 is fixedly installed at the lower end of the vertical movement track 194. The laser shock strengthening head 18 is located above the restraint layer placement area 17. Through the combination of multi-dimensional tracks, the laser shock strengthening head 18 can achieve high-precision positioning and movement in three-dimensional space, ensuring that the impact strengthening process can accurately cover all parts of the deposition layer and meet the strengthening requirements of workpieces with complex shapes.

[0052] Furthermore, the track support frames 191, the transverse movement track 192, the longitudinal movement tracks 193, and the vertical movement track 194 are all connected to the integrated control system 20. Through the integrated control system 20, the laser shock strengthening head 18 can move in the three directions of the x-y-z axes to impact and strengthen deposition layers with different shapes. The integrated control system 20 can accurately control the movement trajectory of the laser shock strengthening head 18 in three-dimensional space according to the preset process parameters and the shape of the workpiece, ensuring the automation and consistency of the impact strengthening process, and can dynamically adjust the position and movement speed of the shock strengthening head according to the real-time feedback of the workpiece state and strengthening effect, further optimizing the strengthening process.

[0053] Furthermore, the pulsed laser wavelength of the laser shock strengthening head 18 is 1064 nm, the working frequency is 5 Hz, the maximum pulse energy is 15 J, the pulse width is 15 - 20 ns, the spot diameter is 3 - 10 mm, the overlap rate is 50 - 70%, and the energy distribution of the laser beam is Gaussian distribution.

[0054] The integrated control system 20 is provided on the outer wall of the transition cabin 11 of the manufacturing platform. As the central control unit of the entire additive manufacturing system, it is connected to the additive manufacturing module, the environmental control module, the mobile conversion module, and the impact strengthening module through signal lines. The status signals of each component are transmitted to the integrated control system 20 in real time, which receives, analyzes, and collaboratively processes them, and issues corresponding operation instructions according to the preset process flow and control logic, so as to realize the automatic and intelligent control of the entire system. The integrated control system 20 also includes controlling the laser strengthening process through the optimal planning path and automatically calculating the optimal planning path based on material characteristics and processing requirements.

[0055] During the laser shock peening (LSP) process, the planned path and strengthening parameters (wavelength, frequency, pulse energy, pulse width, spot diameter, overlap rate) affect each other and jointly determine the strengthening effect. The wavelength affects the interaction mechanism between the laser and the material. Short-wavelength lasers are more likely to excite the initial plasma, but long-wavelength lasers have more advantages under high power density and long pulse width conditions. Pulse energy and pulse width directly affect the peak pressure and energy deposition efficiency of the shock wave. The greater the pulse energy and the shorter the pulse width, the higher the peak pressure of the shock wave. The spot diameter and overlap rate affect the uniformity of the strengthening area and the residual stress distribution. A larger spot diameter and an appropriate overlap rate can increase the amplitude and depth of the residual stress. The frequency determines the processing efficiency and the number of impacts, and needs to be selected according to material characteristics and processing requirements. When planning the path, the interaction of these parameters needs to be comprehensively considered to achieve the best strengthening effect.

[0056] During the laser shock peening (LSP) process, in order to optimize the process parameters and improve the final strength of the material, an evaluation function based on multi-objective optimization can be established to guide the search for the optimal path parameters. Combining parameters such as pulsed laser wavelength, frequency, pulse energy, pulse width, spot diameter, and overlap rate, determine the evaluation function of the final strength of the component and its relationship with each parameter.

[0057] Define the evaluation function F as the comprehensive index of the optimal planning path, which is used to evaluate the material performance after laser shock peening. The evaluation function F is the linear weighted sum of multiple sub-objective functions. Through normalization, the dimensional differences of each objective are eliminated, ensuring that the objective function can not only reflect the actual physical process, but also flexibly balance the conflicts between efficiency, quality, and material performance by adjusting the weights.

[0058]

[0059] Where: F is the evaluation function of the optimal planning path;

[0060] ω i is the weight of the i-th laser shock peening parameter;

[0061] fi (x i ) is the normalized sub-objective function of the i-th laser shock peening parameter;

[0062] x i is the i-th laser shock peening parameter, including pulsed laser wavelength, frequency, pulse energy, pulse width, spot diameter, and overlap rate.

[0063] The final strength S of the component is positively correlated with the evaluation function F, that is, the larger the evaluation function F, the higher the final strength of the material. By maximizing the evaluation function F through an optimization algorithm, the optimal combination of process parameters can be found, thus achieving the maximization of material strength.

[0064]

[0065] During the laser shock peening process, integrating the optimization algorithm into the control system can automatically select the optimal process parameters (such as pulsed laser wavelength, frequency, pulse energy, pulse width, spot diameter, and overlap rate) according to the material properties and processing requirements, and generate the best scanning path by comprehensively considering the interaction of these parameters, thereby achieving precise parameter selection and path planning. Finally, the optimized parameters and path are transmitted to the laser shock peening equipment to ensure both improving material performance and taking into account processing efficiency and quality.

[0066] The integrated control system 20, as the core of the entire additive manufacturing system, includes data acquisition devices for collecting the operating parameters of each module; human-machine interaction and remote control, through which operators can monitor the equipment operating status, adjust process parameters, and achieve remote control; an analysis and processing unit for precisely analyzing the collected data; storage devices for storing process flows, control logics, and historical data; and instruction output devices for sending operation instructions to each module according to the preset process flows and control logics. Through the collaborative work of these devices, the integrated control system 20 realizes the automated and intelligent control of the entire system, ensuring the efficient and stable operation of each module and guaranteeing the smooth progress of the additive manufacturing process.

[0067] The composite manufacturing device of the present invention consists of an additive manufacturing module, an environmental control module, a mobile conversion module, an impact strengthening module, and an integrated control system 19. The additive manufacturing module is the core part of the entire composite manufacturing device and is responsible for the layer-by-layer forming of workpieces. Its core components include an additive manufacturing chamber, a laser coaxial wire feeding additive printing head, a wire feeding mechanism, and an additive manufacturing platform. The additive manufacturing chamber provides a closed environment for the forming process, effectively isolating external interferences such as dust and humidity, thereby significantly improving the quality and stability of additive manufacturing. The laser coaxial wire feeding technology ensures the stability of the molten pool by precisely controlling the wire feeding and laser melting processes, reducing the fluctuations of the molten pool, and thus improving the forming accuracy and surface quality. The multi-axis robotic arm inside the additive manufacturing platform can achieve precise motion control of the X-Y-Z axes, enabling the printing head to move flexibly to meet the forming requirements of workpieces with complex shapes. The environmental control module provides an inert gas environment with low oxygen content for the additive manufacturing process through a vacuum system and a protective gas delivery device. The vacuum system can quickly evacuate the air inside the additive manufacturing chamber, reducing the oxygen content, thereby avoiding the oxidation of materials at high temperatures. The mobile conversion module realizes the automatic movement of the additive manufacturing platform between the additive manufacturing chamber and the transition chamber through the design of the manufacturing platform transition chamber and the motion slide rail. The manufacturing platform transition chamber provides an independent transition area for the additive manufacturing platform, enabling the additive manufacturing chamber to focus on the forming process, while the transition chamber is used for the movement and subsequent processing of the platform, significantly improving the overall utilization rate of the equipment. The impact strengthening module is responsible for laser shock strengthening of the layer-by-layer formed workpieces, significantly improving the mechanical properties of the workpieces. Its core components include an impact strengthening platform, a restraint layer fixture, a platform ranging device, and a laser shock strengthening head. The impact strengthening platform is equipped with a movable restraint layer fixture that can automatically adjust the height of the restraint layer to adapt to workpieces of different heights. The integrated control system, as the central control unit of the entire composite manufacturing device, realizes the automation and intelligent control of each module. The integrated control system can dynamically adjust the operating parameters of each module, optimize the manufacturing and strengthening processes, and further improve the production efficiency and product quality.

[0068] Example 2

[0069] Combined with Figure 1 , such as Figure 2 shown, the present invention provides a composite manufacturing method of laser wire feeding additive - layer - by - layer impact strengthening, which is realized by applying the above - mentioned composite manufacturing device of laser wire feeding additive - layer - by - layer impact strengthening. The specific steps are as follows:

[0070] S100: First, sequentially start the integrated control system 20, the additive manufacturing module, the environmental control module, the mobile conversion module, and the impact strengthening module. Place the substrate on the flat plate 5. Turn on the vacuum system 6 through the integrated control system 20 to evacuate the additive manufacturing chamber 1 to a vacuum state, and then start the protective gas delivery device 7 to deliver a protective atmosphere into the additive manufacturing chamber 1.

[0071] S200: Set the planned path for additive manufacturing on the integrated control system 20, and set the relevant process parameters for additive manufacturing according to the material and workpiece requirements. Subsequently, control the laser coaxial wire feeding additive printing head 2 and the wire feeding mechanism 3 through the integrated control system 20 to melt the metal material layer by layer and deposit a layer of TC4 metal on the substrate of the additive manufacturing platform 4.

[0072] S300: After the deposition of the first layer of metal is completed, open the hatch 9 of the additive manufacturing chamber through the integrated control system 20, move the additive manufacturing platform 4 and the flat plate 5 into the manufacturing platform transition chamber 11, close the first hatch 9, and open the second hatch 12.

[0073] S400: Move the substrate and the metal deposition layer on the flat plate 5 to the shot peening platform 13, attach the absorption layer 14 to its surface, select a suitable restraining layer and install it at the restraining layer placement position 17. Detect the distance between the metal deposition layer and the restraining layer placement position 17 through the platform ranging device 15 controlled by the integrated control system 20. Subsequently, control the automatic movement of the restraining layer clamp 16 to attach the restraining layer to the absorption layer 14 of the deposition layer.

[0074] S500: Set the planned path for laser shock peening on the integrated control system 20, and set the relevant process parameters for laser shock peening according to the process requirements. Then, start the laser shock peening head 18 to perform shock peening on the deposited layer metal.

[0075] S600: After the laser shock peening is completed, remove the absorption layer 14 on the metal deposition layer. Then, transfer the substrate together with the metal deposition layer to the additive manufacturing platform 4. Move the additive manufacturing platform 4 to the manufacturing platform transition chamber 11 through the integrated control system 20, close the second hatch 12, open the first hatch 9, and move the additive manufacturing platform 4 to the additive manufacturing chamber 1, and close the second hatch 9.

[0076] S700: Turn on the vacuum pumping system 6 through the integrated control system 20 to pump the additive manufacturing chamber 1 to a vacuum state. Then, start the protective gas delivery device 7 to deliver the protective gas into the additive manufacturing chamber 1. Subsequently, continue to deposit the next layer of metal according to the procedure in step S200.

[0077] S800: Repeat steps S300 to S700 to perform metal deposition and laser shock peening layer by layer until the forming and strengthening of the entire workpiece are completed.

[0078] Furthermore, for different workpiece materials, different parameters need to be selected for additive manufacturing and laser shock peening.

[0079] Example 3

[0080] This embodiment of the present invention proposes a composite manufacturing method of laser wire feeding additive manufacturing - layer - by - layer impact strengthening, and the specific steps include:

[0081] S100: First, sequentially start the integrated control system 20, the additive manufacturing module, the environmental control module, the movement conversion module, and the impact strengthening module. Place the substrate on the flat plate 5. Through the integrated control system 20, turn on the vacuum system 6 to evacuate the additive manufacturing chamber 1 to a vacuum state, and then start the protective gas delivery device 7 to deliver argon gas into the additive manufacturing chamber 1.

[0082] S200: Set the planned path of additive manufacturing forming on the integrated control system 20, and according to the material and workpiece requirements, set the relevant process parameters of additive manufacturing as laser power 1000W, scanning speed 16mm / s, wire feeding speed 22mm / s. Subsequently, through the integrated control system 20, control the laser coaxial wire feeding additive printing head 2 and the wire feeding mechanism 3 to melt the metal material layer by layer and deposit a layer of TC4 metal on the substrate of the additive manufacturing platform 4.

[0083] S300: When the deposition of the first layer of metal is completed, through the integrated control system 20, open the hatch door 9 of the additive manufacturing chamber, move the additive manufacturing platform 4 and the flat plate 5 into the manufacturing platform transition chamber 11, close the first hatch door 9, and open the second hatch door 12.

[0084] S400: Move the substrate and the metal deposition layer on the flat plate 5 to the impact strengthening platform 13, attach a 100μm aluminum foil on its surface as the absorption layer 14, and select a 3mm - thick K9 glass as the confinement layer and install it at the confinement layer placement position 17. Through the integrated control system 20, operate the platform ranging device 15 to detect the distance between the metal deposition layer and the confinement layer placement position 17. Subsequently, control the automatic movement of the confinement layer fixture 16 to attach the confinement layer to the absorption layer 14 of the deposition layer.

[0085] S500: Set the planned path of laser shock strengthening on the integrated control system 20, and according to the process requirements, set the relevant process parameters of laser shock strengthening as pulse width 15ns, spot diameter 3mm, pulse energy 15J, and spot overlap rate 50%. Then, start the laser shock strengthening head 18 to perform shock strengthening on the deposited layer metal.

[0086] S600: When the laser shock strengthening is completed, remove the absorption layer 14 on the metal deposition layer. Then, transfer the substrate together with the metal deposition layer to the additive manufacturing platform 4. Through the integrated control system 20, move the additive manufacturing platform 4 to the manufacturing platform transition chamber 11, close the second hatch door 12, open the first hatch door 9, and move the additive manufacturing platform 4 into the additive manufacturing chamber 1, and close the second hatch door 9.

[0087] S700: Turn on the vacuum pumping system 6 through the integrated control system 20, evacuate the additive manufacturing chamber 1 to a vacuum state, then start the protective gas delivery device 7 to deliver the protective gas into the additive manufacturing chamber 1, and then continue to deposit the next layer of metal according to the procedure in step S200.

[0088] S800: Repeat steps S300 to S700 to perform metal deposition and laser shock peening layer by layer until the forming and strengthening of the entire workpiece are completed. The tensile strength of the obtained TC4 workpiece is 1025 Mpa.

[0089] Example 4

[0090] This embodiment of the present invention proposes a composite manufacturing method of laser wire feeding additive - layer - by - layer shock strengthening. The specific steps include:

[0091] S100: First, start the integrated control system 20, additive manufacturing module, environment control module, mobile conversion module, and shock strengthening module in sequence. Place the substrate on the flat plate 5, turn on the vacuum pumping system 6 through the integrated control system 20 to evacuate the additive manufacturing chamber 1 to a vacuum state, and then start the protective gas delivery device 7 to deliver argon into the additive manufacturing chamber 1.

[0092] S200: Set the planned path of additive manufacturing forming on the integrated control system 20, and set the relevant process parameters of additive manufacturing according to the material and workpiece requirements as laser power 800W, scanning speed 18 mm / s, wire feeding speed 20 mm / s. Subsequently, control the laser coaxial wire feeding additive printing head 2 and the wire feeding mechanism 3 through the integrated control system 20 to melt the metal material layer by layer and deposit a layer of TC4 metal on the substrate of the additive manufacturing platform 4.

[0093] S300: After the deposition of the first layer of metal is completed, open the hatch 9 of the additive manufacturing chamber through the integrated control system 20, move the additive manufacturing platform 4 and the flat plate 5 into the manufacturing platform transition chamber 11, close the first hatch 9, and open the second hatch 12.

[0094] S400: Move the substrate and the metal deposition layer on the flat plate 5 to the shock strengthening platform 13, attach a 100 - μm black tape on its surface as the absorption layer 14, select a 2.7 - mm - thick K9 glass as the confinement layer and install it at the confinement layer placement 17. Detect the distance between the metal deposition layer and the confinement layer placement 17 through the platform ranging device 15 controlled by the integrated control system 20. Subsequently, control the automatic movement of the confinement layer fixture 16 to attach the confinement layer to the absorption layer 14 of the deposition layer.

[0095] S500: Set the planned path of laser shock peening on the integrated control system 20, and according to the process requirements, set the relevant process parameters of laser shock peening as pulse width 20 ns, spot diameter 3.6 mm, pulse energy 12 J, and spot overlap rate 50%. Then, start the laser shock peening head 18 to perform shock peening on the deposited layer metal;

[0096] S600: After the laser shock peening is completed, remove the absorption layer 14 on the metal deposition layer. Then, transfer the substrate together with the metal deposition layer to the additive manufacturing platform 4. Move the additive manufacturing platform 4 to the manufacturing platform transfer cabin 11 through the integrated control system 20, close the second hatch 12, open the first hatch 9, and move the additive manufacturing platform 4 into the additive manufacturing cabin 1, and close the second hatch 9;

[0097] S700: Turn on the vacuum pumping system 6 through the integrated control system 20 to pump the additive manufacturing cabin 1 to a vacuum state. Then, start the protective gas delivery device 7 to deliver the protective gas into the additive manufacturing cabin 1. Subsequently, continue to deposit the next layer of metal according to the procedure in step S200;

[0098] S800: Repeat steps S300 to S700 to perform metal deposition and laser shock peening layer by layer until the forming and strengthening of the entire workpiece are completed. The tensile strength of the obtained TC4 workpiece is 997 Mpa.

[0099] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite manufacturing device of laser wire feeding additive and layer-by-layer impact strengthening, characterized in that: It comprises an additive manufacturing module, an environmental control module, a mobile conversion module, an impact strengthening module and an integrated control system (19), wherein: The additive manufacturing module comprises an additive manufacturing cabin (1), wherein a laser coaxial wire feeding additive printing head (2), a wire feeding mechanism (3), and an additive manufacturing platform (4) are arranged inside the additive manufacturing cabin (1), wherein the laser coaxial wire feeding additive printing head (2) and the wire feeding mechanism (3) are fixedly mounted on the top surface of the additive manufacturing cabin (1), and the laser coaxial wire feeding additive printing head (2) is connected to the wire feeding mechanism (3), and the additive manufacturing platform (4) is arranged on the bottom surface of the additive manufacturing cabin (1), and a flat plate (5) is arranged on the top thereof for realizing movement in three directions of the xyz axis to implement printing of a deposition path; The environmental control module comprises a vacuum system (6) and a protective gas delivery device (7) fixedly mounted on the right side surface of the additive manufacturing cabin (1); the protective gas delivery device (7) is connected to a gas cylinder (8), and the gas cylinder (8) is arranged outside the additive manufacturing cabin (1); The mobile conversion module comprises a manufacturing platform transition cabin (11), a first cabin door (9) is provided between the manufacturing platform transition cabin (11) and the additive manufacturing cabin 1, and a second cabin door (12) is provided on the left side thereof, and a moving slide rail (10) is fixedly installed on the bottom surface of the additive manufacturing cabin (1) and the manufacturing platform transition cabin (11), and one end of the moving slide rail in the additive manufacturing cabin (1) is slidably connected to the additive manufacturing platform (4); The impact strengthening module is arranged outside the manufacturing platform transition cabin (11), and comprises a first column (131), a second column (151), a laser impact strengthening head (18), and a moving device (19); an impact strengthening platform (13) is fixedly installed on the upper middle part of the first column (131); a limiting layer fixture (16) is arranged on the upper part of the impact strengthening platform (13) and is slidably connected to the first column (131); a platform distance measuring device (15) is slidably connected to the second column (151); the platform distance measuring device (15) is connected to the impact strengthening platform (13); and the laser impact strengthening head (18) is arranged on the moving device (19); The integrated control system (20) is arranged on the outer side wall of the manufacturing platform transition cabin (11) and serves as a central control unit of the entire additive manufacturing system. It is connected to the additive manufacturing module, the environmental control module, the mobile conversion module and the impact strengthening module through signal lines.

2. The laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device according to claim 1, characterized in that: A restriction layer placement location (17) is provided in the middle of the restriction layer fixture (16). The restriction layer used in the restriction layer placement location (17) is a 3-5 mm thick glass or quartz sheet with high light transmittance, high hardness and strong impact resistance.

3. The laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device according to claim 1, characterized in that: The impact strengthening module also includes an absorption layer (14) arranged on the workpiece. The absorption layer (14) needs to be manually laid on the upper part of the workpiece. The absorption layer (14) includes but is not limited to aluminum foil or black tape.

4. The laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device according to claim 1, characterized in that: During the additive manufacturing process, the first hatch (9) and the second hatch (12) cannot be opened at the same time. When the first hatch (9) is opened, the second hatch (12) must be closed, the additive manufacturing platform (4) is moved to the manufacturing platform transition cabin (11), the first hatch (9) is closed, the second hatch (12) is opened, and the substrate and the deposited workpiece on the flat plate (5) are moved outside the platform transition cabin (11).

5. The laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device according to claim 1, characterized in that: The platform distance measuring device (15) can monitor the height of the workpiece on the impact hardening platform (13), transmit the monitoring information to the impact hardening platform (13), and automatically lift the limiting layer fixture (16) to a height that matches the surface of the workpiece.

6. A laser wire feeding additive-layer by layer impact strengthening composite manufacturing device according to any one of claims 1 to 5, characterized in that: The moving device (19) includes a track support frame (191) arranged around the impact strengthening platform (13), the left and right track support frames (191) are fixedly installed with longitudinal motion tracks (193), the longitudinal motion tracks (193) on both sides are slidably connected with a transverse motion track (192), the transverse motion track (192) is vertically slidably connected with a vertical motion track (194), and the lower end of the vertical motion track (194) is fixedly installed with a laser impact strengthening head (18).

7. A laser wire feeding additive-layer by layer impact strengthening composite manufacturing device according to any one of claims 1 to 5, characterized in that: The total power of the laser coaxial wire feeding additive printing head (2) can be set to 200W, 400W, 600W, 800W, 1000W or 1200W, the laser wavelength is 976nm, the scanning speed is 12-18mm / s, the wire feeding speed is 16-22mm / s, and the diameter of the accommodated wire is 0.8-1.2mm.

8. A laser wire feeding additive-layer by layer impact strengthening composite manufacturing device according to any one of claims 1 to 5, characterized in that: The laser shock strengthening head (18) has a pulse laser wavelength of 1064nm, an operating frequency of 5Hz, a maximum pulse energy of 15J, a pulse width of 15-20ns, a spot diameter of 3-10mm, an overlap rate of 50-70%, and a Gaussian distribution of the laser beam energy.

9. A laser wire feeding additive-layer by layer impact strengthening composite manufacturing device according to any one of claims 1 to 5, characterized in that: The gas cylinder (8) is filled with a protective atmosphere, which includes but is not limited to argon, helium or an argon-helium mixed gas.

10. A composite manufacturing method of laser wire feeding additive-layer by layer impact strengthening, characterized in that: The method is implemented by using a laser wire feeding additive-layer-by-layer impact strengthening composite manufacturing device as described in any one of claims 1 to 9, comprising: S100: First, the integrated control system (20), the additive manufacturing module, the environmental control module, the mobile conversion module and the impact strengthening module are started in sequence, the substrate is placed on the flat plate (5), the vacuum system (6) is started through the integrated control system (20) to evacuate the additive manufacturing chamber (1) to a vacuum state, and then the protective gas delivery device (7) is started to deliver protective atmosphere to the additive manufacturing chamber (1); S200: setting a planned path for additive manufacturing on the integrated control system (20), and setting relevant process parameters for additive manufacturing according to material and workpiece requirements, and then controlling the laser coaxial wire feeding additive printing head (2) and the wire feeding mechanism (3) through the integrated control system (20) to melt the metal material layer by layer and deposit it on a substrate of the additive manufacturing platform (4); S300: After the first layer of metal deposition is completed, the hatch (9) of the additive manufacturing cabin is opened through the integrated control system (20), the additive manufacturing platform (4) and the plate (5) are moved into the manufacturing platform transition cabin (11), the first hatch (9) is closed, and the second hatch (12) is opened; S400: moving the substrate and the metal deposition layer on the flat plate (5) onto the impact strengthening platform (13), and attaching the absorption layer (14) on the surface thereof, and selecting a suitable restriction layer to be installed at the restriction layer placement location (17), and controlling the platform distance measuring device (15) through the integrated control system (20) to detect the distance between the metal deposition layer and the restriction layer placement location (17), and then controlling the restriction layer fixture (16) to automatically move, so as to attach the restriction layer to the absorption layer (14) of the deposition layer; S500: setting a planning path for laser shock peening on the integrated control system (20), and setting relevant process parameters of laser shock peening according to process requirements, and then starting the laser shock peening head (18) to perform shock peening on the deposited metal layer; S600: After the laser shock peening is completed, the absorption layer (14) on the metal deposition layer is removed, and then the substrate together with the metal deposition layer is transferred to the additive manufacturing platform (4), and the additive manufacturing platform (4) is moved to the manufacturing platform transition cabin (11) through the integrated control system (20), the second cabin door (12) is closed, the first cabin door (9) is opened, and the additive manufacturing platform (4) is moved into the additive manufacturing cabin (1), and the second cabin door (9) is closed; S700: starting the vacuum pumping system (6) through the integrated control system (20) to pump the additive manufacturing chamber (1) into a vacuum state, then starting the protective gas delivery device (7) to deliver protective gas into the additive manufacturing chamber (1), and then continuing to deposit the next layer of metal according to the procedure in step S200; S800: Repeat steps S300 to S700, performing metal deposition and laser shock strengthening layer by layer until the forming and strengthening of the entire workpiece are completed.

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