Laser creep forming device and method for thin-wall component

Abstract

The invention provides a laser creep forming device and method for a thin-wall component. The device comprises a forming die which is provided with a die molded surface and outer edge surfaces located at the two ends of the die molded surface. The fixing parts are located on the two outer edge faces and used for being fixed to the two ends of a blank, and the blank is bent towards the side where the mold profile is located to form preforming. The multi-dimensional movement mechanism is provided with a movable end, the movable end is located above the mold molded surface, and the movable track covers the area corresponding to the mold molded surface; and the laser generating mechanism is connected with the movable end, faces the molded surface of the mold and is used for heating a laser irradiation area on the blank for laser creep age forming. More elastic internal energy in the material of the blank is promoted to be converted into plastic work through the laser heat effect, residual deformation is partially released, the internal stress of the blank is reduced, creep age forming of the material is more facilitated, the forming property of the material is improved, and creep age forming can be accurately carried out on all areas of the blank.

Description

Technical Field

[0001] The present invention relates to the field of laser processing of metal components, and in particular to a laser creep forming device and method for thin-walled components. Background Art

[0002] Currently, creep aging forming processes are commonly performed in an autoclave using a vacuum seal. This involves placing the sheet metal on a fixed mold, sealing it to the mold surface with high-temperature glue and a vacuum bag, then pushing it into the autoclave. The process parameters are set for creep aging, and after completion, the material is removed from the autoclave and the vacuum bag is removed to obtain the formed component. However, the overall creep aging forming process for thin-walled aerospace components often results in insufficient post-forming precision, localized wavy defects, and even unstable buckling and cracking, due to a lack of real-time monitoring and adjustment of the component's state during the forming process. This ultimately leads to low overall component precision and low yield. Furthermore, the vacuum bagging preparation process prior to forming is complex and, due to the autoclave's limited equipment capacity and heating rate, leaves much room for improvement in the overall creep aging forming efficiency of the component.

[0003] Currently, relevant technologies have emerged in engineering to address this issue. For example, Chinese patent publication number CN 110802163 B discloses a method for using an ultrasonically assisted batch creep aging forming device for wall panels. This patent discloses using a thermoforming machine to provide a heat source to heat the wall panel blanks for mass production of parts. However, considering that thermoforming machines use electric furnaces to heat the entire machine surface, the heating rate is not significantly improved compared to autoclaves. Furthermore, thermoforming machines heat the entire part, making it impossible to provide targeted heating to difficult-to-form locations, thus limiting the part forming capability.

[0004] For example, Chinese patent publication number CN 117531911 B discloses a method for forming melon-shaped components using electric pulse creep aging. This patent describes the use of electric pulse heating of sheet metal to achieve creep aging. Compared to autoclave heating, electric pulse heating significantly improves heating efficiency, but it also results in varying heating temperatures in different sized areas, hindering the overall creep forming of complex, thin-walled parts. Furthermore, due to the current's tendency to preferentially follow the path of least resistance, the heating method must be redesigned for difficult-to-form areas, resulting in significant manufacturing limitations.

[0005] Therefore, it is urgent to propose a new creep forming method that is convenient for forming control of local difficult-to-form areas and has small manufacturing limitations, so as to improve the forming and manufacturing efficiency of thin-walled structural parts in my country's aerospace industry. Summary of the Invention

[0006] The main purpose of the present invention is to provide a laser creep forming device and method for thin-walled components to solve the technical problems of inconvenient forming control in difficult-to-form areas and large manufacturing limitations in the laser creep forming method for thin-walled components.

[0007] To achieve the above-mentioned object, the present invention provides a laser creep forming device for thin-walled components, comprising: The forming die comprises a die profile and outer edges located at both ends of the die profile, wherein the die profile matches a target profile of a thin-walled component.

[0008] The fixing portion is located on the two outer edges and is used to be fixed on both ends of the blank to bend the blank toward the side where the mold surface is located to form a preform.

[0009] The multi-dimensional motion mechanism has a movable end, the movable end is located above the mold surface, and the movable track covers the area corresponding to the mold surface.

[0010] The laser generating mechanism is connected to the movable end and faces the mold surface, and is used for heating the laser irradiated area on the blank to perform laser creep aging forming.

[0011] According to an embodiment of the present application, the multi-dimensional motion mechanism includes a movable truss platform and a robotic arm, wherein the fixed end of the robotic arm is connected to the movable truss platform, and the movable end is connected to the laser generating mechanism.

[0012] According to the implementation mode of the present application, it also includes: The three-dimensional wide-area measuring device has a measuring range covering the blank.

[0013] The controller includes a receiving end and a control end. The receiving end is communicatively connected to the three-dimensional wide-area measurement device, and the control end is communicatively connected to the laser generating mechanism and the multi-dimensional motion mechanism respectively.

[0014] According to an embodiment of the present application, each of the fixing portions includes a slide rail provided on the outer edge surface, a slider engaged with the slide rail, and a locking member for locking the position of the slider. The slide rail extends perpendicularly to the end surface of the mold profile, and the slider is connected to the end surface of the blank.

[0015] According to an embodiment of the present application, the locking member includes a plurality of limiting holes provided on the outer edge and arranged along the extension direction of the slide rail, the slider has a fixing hole that cooperates with the limiting holes and is connected by a fixing pin. The slider has an abutment portion that surrounds the end of the blank.

[0016] The present application also provides a laser creep forming method for thin-walled components, which is based on the above-mentioned laser creep forming device and performs laser creep forming, comprising the following steps: The blank is placed on the die surface of the forming die. The blank is a thin-walled structure with a thickness of ≤5 mm.

[0017] The two ends of the blank are fixed by the fixing part, and the blank is bent toward the side where the mold surface is located to form a pre-form.

[0018] According to laser creep process parameters, a laser generating mechanism follows the movement of the active end of the multi-dimensional motion mechanism and emits laser light to heat the laser irradiated area of ​​the blank to perform laser creep aging forming. The laser creep process parameters include at least one of a laser focus spot, a width, a preset laser temperature, a laser hold time, and path control.

[0019] According to the implementation of the present application, the laser generating mechanism meets the following conditions: continuous laser irradiation, rated output power of 3000W, power adjustment range of 10-100%, electro-optical conversion efficiency >35%, and output power instability ≤±1%.

[0020] According to the implementation mode of the present application, it also includes: During the laser creep aging forming process, the state information of the blank is measured by a three-dimensional wide-area measuring device, and the current molding parameters are transmitted to the controller. The state information includes molding parameters, temperature values, stress values, and strain values.

[0021] The controller compares the profile parameters with target profile parameters, adjusts laser process parameters based on temperature values, stress values, and strain values, and transmits the adjusted parameters to the laser generating mechanism and the multi-dimensional motion mechanism.

[0022] According to an embodiment of the present application, in the pre-formed state, two ends of the blank are flush with two ends of the mold surface.

[0023] According to an embodiment of the present application, the initial laser creep process parameters are determined by the material constitutive equation of the blank according to simulation experimental results.

[0024] In the aforementioned laser creep forming device for thin-walled components, the blank is squeezed toward the center by a fixed portion, causing it to bend toward the mold surface to complete pre-forming. A laser generating mechanism follows the movement of the active end of the multi-dimensional motion mechanism, emitting laser light to heat the laser-irradiated area of ​​the blank. The laser thermal effect converts more elastic internal energy within the blank into plastic work, partially releasing residual deformation and reducing internal stress in the blank. This further facilitates creep aging forming of the material and improves its formability. Because the laser irradiation area can be precisely controlled, creep aging forming can be performed precisely on each region of the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 1 is a schematic structural diagram of a laser creep forming device for thin-walled components according to an embodiment of the present application; Figure 2 is a side view of a fixing portion according to an embodiment of the present application; Figure 3 is a top view of a fixing portion according to an embodiment of the present application; Figure 4 This is a flow chart of a laser creep forming method for thin-walled components according to one embodiment of the present application.

[0027] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0028] 100, forming mold; 200, fixing part; 300, multi-dimensional motion mechanism; 400, laser generating mechanism; 500, three-dimensional wide-area measuring device; 600, controller; 700, blank; 110, mold surface; 120, outer edge surface; 210, slide rail; 220, slider; 230, locking member; 231, limiting hole; 232, fixing hole; 310, movable truss platform; 320, robotic arm; 410, laser generator; 420, laser emission head. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0032] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides a laser creep forming device for thin-walled components. Figures 1 to 3 , including a forming mold 100, a fixing part 200, a multi-dimensional motion mechanism 300 and a laser generating mechanism 400.

[0034] The forming die 100 comprises a die profile 110 and outer edge surfaces 120 located at both ends of the die profile 110. The die profile 110 matches the target profile of the thin-walled component.

[0035] The specific structure and manufacturing process of the forming die 100 are not limited. The die surface 110 matches the target profile of the thin-walled component. For example, the die surface 110 is designed based on the target profile and the results of simulated springback of the sheet metal. Thin-walled components are not limited to flat plates and include ribbed panels and curved panels with a certain curvature. The curvature of the curved panel is not limited to a single curve. The following embodiments of this application are described using thin-walled components with curved surfaces as an example.

[0036] For ease of description, the direction along the two ends of the mold profile 110 is defined as the length direction. Correspondingly, the direction perpendicular to the two ends of the mold profile 110 is defined as the width direction. There are two outer edges 120, located at both ends of the mold profile 110.

[0037] The fixing portion 200 is located on the two outer edges 120 and is used to be fixed on both ends of the blank 700 to bend the blank 700 toward the side where the mold surface 110 is located to form a pre-form.

[0038] The length of the blank 700 is greater than or equal to the expanded length of the mold surface 110 in the longitudinal direction.

[0039] Exemplarily, the length of the blank 700 is equal to the length of the mold surface 110 in the longitudinal direction, meaning that the length of the blank 700 is consistent with the designed length. In this case, the length of the formed component is consistent with the target component length. Because the mold surface 110 is curved, the length of the blank 700 is greater than the actual length of the mold surface 110. When the blank 700 is placed flat on the mold surface 110, both ends can rest on the outer edge surface 120 and be fixed to the corresponding fixing portions 200.

[0040] The positions of the fixing parts 200 are reasonably set, and the distance between the two fixing parts 200 is set. The two fixing parts 200 push the blank 700 from both ends, and the extruded blank 700 is bent downward close to the mold surface 110, thus completing the preforming of the blank 700.

[0041] Regardless of which of the above methods is used, the preforming method in the embodiment of the present application eliminates the complicated vacuum sealing bag preparation process compared to the commonly used method of placing the preforms in an autoclave, and the preforming speed and efficiency are greatly improved.

[0042] The multi-dimensional motion mechanism 300 has a movable end, which is located above the mold surface 110 , and a movable track covers an area corresponding to the mold surface 110 .

[0043] The movable end of the multi-dimensional motion mechanism 300 can move in multiple directions such as height, length, and width, such as through a combination of multiple movement modes such as translation and rotation, so that its movement trajectory covers the area corresponding to the mold surface 110.

[0044] The laser generating mechanism 400 is connected to the movable end and faces the mold surface 110 , and is used to heat the laser irradiated area on the blank 700 to perform laser creep aging forming.

[0045] The laser generating mechanism 400 follows the movement of the movable end of the multi-dimensional motion mechanism 300. The laser generating mechanism 400 is positioned above the preformed blank 700, and the emitted laser can illuminate various areas of the blank 700. In some embodiments, the laser generating mechanism 400 includes a laser generator 410 and a laser emitting head 420. Only the laser emitting head 420 is mounted on the movable end and follows the movement.

[0046] Laser process parameters can be set based on the desired laser creep process parameters. These include laser focus spot, width, preset laser temperature, laser hold time, and path control. Regarding path control, the laser generator 400 primarily moves along its length. In some areas, laser irradiation may be performed reciprocally along the length of the area or around the area. The surface temperature of the component irradiated by the laser from the laser generator 400 is controlled to be approximately 160°C.

[0047] Compared with heating methods in the creep aging forming process such as autoclave gas heating and electric pulse heating, continuous laser heating not only significantly improves the heating rate, but also can perform multiple reheating on local positions to achieve the purpose of rapid correction. The operation is more convenient, the number of reworks is reduced, and the efficiency of obtaining the target surface of the part is greatly improved.

[0048] The laser creep forming device for thin-walled components of the present application uses the laser thermal effect to promote the conversion of more elastic internal energy in the material into plastic work, and partially releases the residual deformation, thereby reducing the internal stress of the material, and further facilitating creep aging forming of the material, thereby improving the material's formability.

[0049] Due to the combination of the multi-dimensional motion mechanism 300 to control the path and regulation of the laser generating mechanism 400, the use dimension of the laser creep forming equipment is expanded, and multiple reheating of difficult-to-form areas can be performed, avoiding the process complexity of multiple calibration experiments in traditional autoclave creep aging forming, and reducing manufacturing costs.

[0050] In the above-mentioned laser creep forming device for thin-walled components, the blank 700 is squeezed toward the center by the fixing portion 200, so that it is bent toward the mold surface 110 to complete pre-forming. The laser generating mechanism 400 follows the movement of the movable end of the multi-dimensional motion mechanism 300, emitting laser light to heat the laser irradiated area of ​​the blank 700. The laser thermal effect causes more elastic internal energy in the material of the blank 700 to be converted into plastic work, and the residual deformation is partially released, thereby reducing the internal stress of the blank 700, further facilitating creep aging forming of the material, and improving the material formability. Since the laser irradiation area can be controlled more accurately, creep aging forming can be accurately performed on each area of ​​the blank 700.

[0051] In some embodiments, see Figures 1 to 3 The multi-dimensional motion mechanism 300 includes a movable truss platform 310 and a robotic arm 320 . The fixed end of the robotic arm 320 is connected to the movable truss platform 310 , and the movable end is connected to the laser generating mechanism 400 .

[0052] The movable truss platform 310 can move horizontally, such as along its length and width. The robotic arm 320 has a high degree of freedom, enabling one or more of the following movements: lifting, rotating, and translating. The combination of these two allows the laser generator 400 to have a high degree of freedom and a wide irradiation range, covering different areas of the blank 700. This allows for rapid and direct irradiation of the target area without affecting other areas.

[0053] In some embodiments, see Figures 1 to 3 , also includes: The three-dimensional wide-area measuring device 500 has a measuring range covering the blank 700 .

[0054] The controller 600 includes a receiving end and a control end. The receiving end is communicatively connected to the three-dimensional wide-area measurement device 500 , and the control end is communicatively connected to the laser generating mechanism 400 and the multi-dimensional motion mechanism 300 .

[0055] The three-dimensional wide-area measurement device 500 may include a global high-resolution 3D camera and a local high-resolution 3D camera.

[0056] Exemplarily, the three-dimensional wide-area measurement device 500 has an independent analysis system, which analyzes the image information captured by the global high-resolution 3D camera and the local high-resolution 3D camera to obtain one or more characteristic information of the morphology, displacement, strain, velocity, acceleration, phase, etc. of the blank 700 during laser creep forming, and then transmits the above characteristic information to the controller 600.

[0057] As another example, the analysis system is integrated into the control system of the controller 600. In this way, only the image information is transmitted to the controller 600, and the controller 600 analyzes and processes the image information.

[0058] In some embodiments, the three-dimensional wide-area measurement device 500 has a strain resolution of ≤0.002%, a strain measurement range of 0.005%-≥2000%, a displacement resolution of ≤0.001 pixel, a measurement width of 6mm-≥20m, and has the function of intercommunication between measurement test data and CAE simulation.

[0059] In some embodiments, see Figure 1 The controller 600 is a computer having multiple data transmission interfaces serving as a receiving end and a control end.

[0060] Compared to invisible creep aging forming, where both the blank 700 and the mold are placed in an autoclave, in this embodiment of the present application, during laser creep forming, the 3D wide-area measurement device 500 can monitor the workpiece's morphology, strain, and other information in real time during the forming process. The controller 600 uses the real-time feedback from the 3D wide-area measurement device 500 to monitor the surface parameters and compares them with the target surface parameters (e.g., the controller 600 has pre-stored target surface parameter information). If significant differences are detected, the laser creep forming process can be adjusted promptly until the part's springback finishes after forming, resulting in a surface that aligns with the target surface. This ensures the overall formability of the part and prevents damage to the part caused by repeated forming.

[0061] In some embodiments, see Figures 1 to 3Each of the fixing portions 200 includes a slide rail 210 disposed on the outer edge 120, a slider 220 engaged with the slide rail 210, and a locking member 230 for locking the position of the slider 220. The slide rail 210 extends perpendicular to the end face of the mold surface 110, and the slider 220 is connected to the end face of the blank 700.

[0062] The sliders 220 of the two fixing parts 200 respectively rest against the ends of the blank 700 and move along the corresponding slide rails 210 toward the mold surface 110. When reaching the current position (for example, the end surface of the blank 700 is basically flush with the end surface of the mold surface 110), the sliders 220 are fixed by the locking member 230.

[0063] In some embodiments, see Figures 1 to 3 The locking member 230 includes a plurality of limiting holes 231 disposed on the outer surface 120 and along the extending direction of the slide rail 210. The slider 220 has a fixing hole 232 that matches the limiting holes 231 and is connected by a fixing pin. The slider 220 has an abutment portion that surrounds the end of the blank 700.

[0064] The locking member 230 of this structure is simple in structure and highly reliable. The abutting portion is a lateral groove with an opening toward the mold profile 110. Under normal conditions, the top surface of the lateral groove contacts the top surface of the blank 700, and the side surface of the lateral groove contacts the end surface of the blank 700. When the end surface of the blank 700 is substantially flush with the end surface of the mold profile 110, the end surface of the slider 220 abuts against the top surface of the lateral groove, achieving fixation. This type of slider 220 has a good fixing effect on the blank 700.

[0065] This application also provides a laser creep forming method for thin-walled components, see Figure 4 Laser creep forming is performed based on the above-mentioned laser creep forming device, including the following steps: The blank 700 is placed on the mold surface 110 of the forming mold 100. The blank 700 is a thin-walled structure with a thickness of ≤5 mm.

[0066] The two ends of the blank 700 are fixed by the fixing portion 200 , and the blank 700 is bent toward the side where the mold surface 110 is located to form a pre-form.

[0067] To facilitate shape correction and reduce the impact of impurities or oxides on the surface of the blank 700, some embodiments also include pre-treatment of the blank 700, such as polishing the surface of the blank 700, wiping it with alcohol, and drying it before use. The blank 700 that has not undergone pre-treatment can be referred to as the original blank 700. If the blank 700 is relatively clean, the pre-treatment step is not necessary.

[0068] Among them, the surface polishing treatment includes but is not limited to manual polishing with sandpaper, local polishing with an angle grinder, and local electrolytic polishing.

[0069] The above-mentioned laser creep forming method of thin-walled components has similar beneficial effects as the aforementioned laser creep forming device, which will not be described in detail here.

[0070] According to laser creep process parameters, the laser generating mechanism 400 follows the movement of the active end of the multi-dimensional motion mechanism 300 and emits laser light to heat the laser-irradiated area of ​​the blank 700 to perform laser creep aging forming. The laser creep process parameters include at least one of the following: laser focus spot, width, laser preset temperature, laser hold time, and path control.

[0071] By adjusting the laser creep forming process parameters, the effect of the laser creep forming can be adjusted to achieve a relatively ideal laser creep forming effect.

[0072] In some embodiments, the laser generating mechanism 400 meets the following conditions: continuous laser irradiation, rated output power of 3000W, power adjustment range of 10-100%, electro-optical conversion efficiency >35%, and output power instability ≤±1%.

[0073] The laser generating mechanism 400 under this condition can meet the laser creep process parameters. The laser can generate appropriate heat, which can promote the conversion of more elastic internal energy of the blank 700 material into plastic work through the thermal effect, and partially release the residual deformation, thereby reducing the internal stress of the blank 700, and making it more conducive to creep aging forming of the material, thereby improving the material formability.

[0074] In some embodiments, the service life of the laser generating mechanism 400 is greater than 30,000 hours.

[0075] In some embodiments, further comprising: During the laser creep aging forming process, the state information of the blank 700 is measured by the three-dimensional wide-area measuring device 500, and the current profile parameters are transmitted to the controller 600. The state information includes profile parameters, temperature values, stress values, and strain values.

[0076] The controller 600 compares the profile parameters with the target profile parameters, adjusts the laser process parameters based on the temperature value, stress value and strain value, and transmits the adjusted laser process parameters to the laser generating mechanism 400 and the multi-dimensional motion mechanism 300 .

[0077] Compared to invisible creep aging forming, where both the blank 700 and the mold are placed in an autoclave, in this embodiment of the present application, during laser creep forming, the 3D wide-area measurement device 500 can monitor the workpiece's morphology, strain, and other information in real time during the forming process. The controller 600 uses the real-time feedback from the 3D wide-area measurement device 500 to monitor the surface parameters and compares them with the target surface parameters (e.g., the controller 600 has pre-stored target surface parameter information). If significant differences are detected, the laser creep forming process can be adjusted promptly until the part's springback finishes after forming, resulting in a surface that aligns with the target surface. This ensures the overall formability of the part and prevents damage to the part caused by repeated forming.

[0078] In some embodiments, in the pre-formed state, two ends of the blank 700 are flush with two ends of the mold surface 110. The length of the formed component prepared in this way is consistent with the target component length.

[0079] In some embodiments, the initial laser creep process parameters are determined by the material constitutive equation of the blank 700 according to simulation experimental results.

[0080] In this step, the material constitutive equation for blank 700 can be used to conduct basic experimental tests on the same sheet material, obtaining creep and mechanical properties at different creep temperatures, creep stresses, and creep times. This constitutive equation is then constructed and fitted using mathematical software. A subroutine is then written and imported into simulation software for finite element simulation of the part's laser creep aging forming process. The actual laser creep forming process parameters for thin-walled parts (e.g., temperature 140°C-220°C, stress 150MPa-400MPa, time 0.2h-6h) and the mold surface 110 are then used as boundary conditions to obtain simulation results after creep aging forming of the part.

[0081] The basic experimental test parameters of creep aging and mechanical properties include creep time, creep temperature, creep stress, heating rate, yield strength, tensile strength, elongation and hardness.

[0082] Among them, mathematical software includes MATLAB, FreeMat, etc., and simulation software includes ANSYS, Comsol, Marc, etc.

[0083] The technical solution of this application is described below with reference to specific embodiments.

[0084] Example 1 The blank 700 is made of 2xxx series aluminum alloy thin-walled flat plate with a thickness of 3mm, and the heat treatment state is under-aged state. The size of the blank 700 is The outer dimensions of the forming die 100 are The mold surface 110 is 800mm long and 700mm wide. The mold base and surface are made of Q345 steel, the surface roughness is Ra1.5, and the maximum working temperature is 300℃.

[0085] The laser irradiation temperature of the component surface was controlled at 160°C, the creep aging forming temperature, with power adjusted to 60% and a creep time of 2 hours. The blank 700 was measured in real time using a 3D wide-area measurement system and compared to the target profile. The resulting thin-walled part achieved the desired forming effect.

[0086] The above technical solutions of the present invention are only preferred embodiments of the present invention and do not limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A laser creep forming device for thin-walled components, characterized in that: include: A forming die having a die profile and outer edge surfaces at both ends of the die profile; the die profile matches a target profile of a thin-walled component; A fixing portion, located on the two outer edge surfaces, used to be fixed on both ends of the blank, and bend the blank toward the side where the mold surface is located to form a preform; A multi-dimensional motion mechanism having a movable end, the movable end being located above the mold surface, and the movable track covers the area corresponding to the mold surface; The laser generating mechanism is connected to the movable end and faces the mold surface, and is used for heating the laser irradiated area on the blank to perform laser creep aging forming.

2. The laser creep forming device for thin-walled components according to claim 1, characterized in that: The multi-dimensional motion mechanism comprises a movable truss platform and a mechanical arm, wherein the fixed end of the mechanical arm is connected to the movable truss platform, and the movable end is connected to the laser generating mechanism.

3. The laser creep forming device for thin-walled components according to claim 1, characterized in that: Also includes: A three-dimensional wide-area measuring device, the measuring range of which covers the blank; The controller includes a receiving end and a control end. The receiving end is communicatively connected to the three-dimensional wide-area measurement device, and the control end is communicatively connected to the laser generating mechanism and the multi-dimensional motion mechanism respectively.

4. The laser creep forming device for thin-walled components according to claim 1, characterized in that: Each of the fixing parts includes a slide rail arranged on the outer edge surface, a slider matched with the slide rail, and a locking member for locking the position of the slider; the extension direction of the slide rail is perpendicular to the end face of the mold surface, and the slider is connected to the end face of the blank.

5. The laser creep forming device for thin-walled components according to claim 4, characterized in that: The locking member includes a plurality of limiting holes arranged on the outer edge surface and along the extension direction of the slide rail, the slider has a fixing hole that matches the limiting holes and is connected by a fixing pin; the slider has a supporting portion that surrounds the end of the blank.

6. A laser creep forming method for thin-walled components, characterized in that: Laser creep forming is performed based on the laser creep forming device according to any one of claims 1 to 5, comprising the following steps: Placing the blank on the mold surface of the forming mold; the blank is a thin-walled structure with a thickness of ≤5 cm; Fixing two ends of the blank by a fixing part, and bending the blank toward the side where the mold surface is located to form a preform; According to the laser creep process parameters, the laser generating mechanism follows the movement of the active end of the multi-dimensional motion mechanism and emits laser to heat the laser irradiated area of ​​the blank to perform laser creep aging forming; wherein the laser creep process parameters include at least one of the laser focusing spot, width, laser preset temperature, laser holding time and path control.

7. The laser creep forming method of a thin-walled component according to claim 6, characterized in that: The laser generating mechanism meets the following conditions: continuous laser irradiation, rated output power of 3000W, power adjustment range of 10-100%, electro-optical conversion efficiency>35%, and output power instability ≤±1%.

8. The laser creep forming method of a thin-walled component according to claim 6, characterized in that: Also includes: During the laser creep aging forming process, the state information of the blank is measured by a three-dimensional wide-area measuring device, and the current profile parameters are transmitted to a controller; The state information includes surface parameters, temperature values, stress values, and strain values; The controller compares the profile parameters with the target profile parameters, adjusts the laser process parameters in combination with the temperature value, stress value and strain value, and transmits the parameters to the laser generating mechanism and the multi-dimensional motion mechanism.

9. The laser creep forming method of a thin-walled component according to claim 6, characterized in that: In the pre-formed state, two ends of the blank are flush with two ends of the mold surface.

10. The laser creep forming method for a thin-walled component according to any one of claims 6 to 9, characterized in that: The initial laser creep process parameters are determined by the material constitutive equation of the blank according to the simulation experiment results.

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