Laser creep forming device and method for thin-walled components

Abstract

The present invention provides a laser creep forming device and method for thin-walled components. The device includes a forming mold, which has a mold profile and outer edges located at both ends of the mold profile. The fixing portion is located on the two outer edges, and is used to fix on both ends of the blank, and bend the blank toward the side where the mold profile is located to form a preform; the multi-dimensional motion mechanism has a movable end, and the movable end is located above the mold profile, and the movable trajectory covers the area corresponding to the mold profile; the laser generating mechanism is connected to the movable end, facing the mold profile, and is used to heat the laser irradiated area on the blank to perform laser creep aging forming. The laser thermal effect causes more elastic internal energy inside the material of the blank to be converted into plastic work, and the residual deformation is partially released, which reduces the internal stress of the blank, is more conducive to creep aging forming of the material, improves the formability of the material, and can also accurately perform creep aging forming on each area of ​​the blank.

Description

Technical Field

[0001] The 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] At present, the creep aging forming process is generally carried out in a vacuum-sealed form in an autoclave, that is, the sheet is placed on a fixed mold, and the sheet is sealed with the mold surface using high-temperature glue and a vacuum bag, and then pushed into the autoclave, and the process parameters are set for creep aging. After the end, the material is taken out of the tank, and the vacuum bag is removed to obtain the formed component. However, for the overall creep aging forming process of aerospace thin-walled components, due to the lack of real-time monitoring and adjustment of the state of the component during the forming process, there are often phenomena of insufficient precision after forming, wavy defects in local areas, and even unstable buckling and cracking, which ultimately lead to low overall component precision and low yield. At the same time, the vacuum bag preparation process before forming is complicated, and is limited by the equipment capacity of the autoclave, and the heating rate is limited, so the efficiency of the overall creep aging forming of the component still has a lot of room for improvement.

[0003] At present, relevant technologies have appeared in engineering to try to solve such problems. For example, the Chinese patent with the authorization announcement number CN 110802163 B discloses "a method for using a wall panel ultrasonic assisted batch creep aging forming device". The patent discloses that the wall panel blank is heated by providing a heat source through a hot forming machine for batch production of parts. However, considering that the hot forming machine uses a heating furnace to heat the machine surface as a whole, the heating rate is not significantly improved compared to the autoclave. At the same time, the hot forming machine heats the parts as a whole, and cannot provide targeted heating for local difficult-to-form locations, and the part forming capacity is limited.

[0004] For example, the Chinese patent with the authorization announcement number CN 117531911 B discloses "a method for forming melon slice components by electric pulse creep aging", which discloses that creep aging forming is completed by electric pulse heating of the sheet. Compared with autoclave heating, electric pulse heating greatly improves the heating efficiency, but there is a phenomenon that the heating temperature of different size areas is different, which is not conducive to the overall creep forming of complex structure thin-walled parts. At the same time, it is limited by the characteristic that the current moves preferentially along the path of minimum resistance. For local difficult-to-form areas, the heating method needs to be redesigned, and the manufacturing limitations are large.

[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 object, the present invention provides a laser creep forming device for thin-walled components, comprising:

[0008] The forming die comprises a die profile and outer edge surfaces at two ends of the die profile, wherein the die profile matches the target profile of the thin-wall component.

[0009] The fixing part is located on the two outer edge surfaces and is used to be fixed on the two ends of the blank to bend the blank toward the side where the mold surface is located to form a preform.

[0010] 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.

[0011] 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.

[0012] According to an embodiment of the present application, the multi-dimensional motion mechanism includes a movable truss platform and a robotic arm, wherein a fixed end of the robotic arm is connected to the movable truss platform, and a movable end is connected to a laser generating mechanism.

[0013] According to the implementation mode of the present application, it also includes:

[0014] The three-dimensional wide-area measuring device has a measuring range covering the blank.

[0015] 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.

[0016] According to an embodiment of the present application, each of the fixing parts comprises 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 surface of the mold profile, and the slider is connected to the end surface of the blank.

[0017] According to an embodiment of the present application, 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 matched with the limiting holes and connected by a fixing pin. The slider has abutment portion surrounding the end of the blank.

[0018] The present application also provides a laser creep forming method for a thin-walled component, which performs laser creep forming based on the above-mentioned laser creep forming device, and includes the following steps:

[0019] The blank is placed above the mold surface of the forming mold. The blank is a thin-walled structure with a thickness of ≤5 mm.

[0020] 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 preform.

[0021] 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. The laser creep process parameters include at least one of the laser focus spot, width, laser preset temperature, laser holding time and path control.

[0022] According to the implementation mode 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%.

[0023] According to the implementation mode of the present application, it also includes:

[0024] 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 the controller. The state information includes profile parameters, temperature values, stress values, and strain values.

[0025] 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.

[0026] According to an embodiment of the present application, in the pre-forming state, two ends of the blank are flush with two ends of the mold surface.

[0027] 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 the simulation experiment results.

[0028] In the above-mentioned laser creep forming device for thin-walled components, the blank is squeezed toward the middle by the fixing part so that it bends toward the mold surface side to complete the preforming. The laser generating mechanism moves along with the movable end of the multi-dimensional motion mechanism, and emits laser to heat the laser irradiated area of ​​the blank. The laser thermal effect causes more elastic internal energy inside the blank material to be converted into plastic work, and the residual deformation is partially released, which reduces the internal stress of the blank, is more conducive to creep aging forming of the material, and improves the formability of the material. Since the laser irradiation area can be controlled more accurately, creep aging forming can be performed accurately on each area of ​​the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0030] Figure 1 It is a schematic structural diagram of a laser creep forming device for thin-walled components according to one embodiment of the present application;

[0031] Figure 2 is a side view of a fixing portion according to an embodiment of the present application;

[0032] Figure 3 is a top view of a fixing portion according to an embodiment of the present application;

[0033] Figure 4 It is a flow chart of a laser creep forming method for a thin-walled component according to one embodiment of the present application.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings.

[0035] 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 piece; 231, limiting hole; 232, fixing hole; 310, movable truss platform; 320, robotic arm; 410, laser generator; 420, laser transmitting head. DETAILED DESCRIPTION

[0036] The following will be combined with the 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0037] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] Furthermore, 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 they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The present invention provides a laser creep forming device for thin-walled components. Figure 1~Figure 3 , including a forming mold 100, a fixing part 200, a multi-dimensional motion mechanism 300 and a laser generating mechanism 400.

[0041] The forming die 100 has 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.

[0042] The specific structure and manufacturing process of the forming die 100 are not limited. The die profile 110 matches the target profile of the thin-walled component. For example, the die profile 110 is jointly designed based on the target profile and the result of the simulated springback of the sheet metal. The thin-walled parts are not limited to flat plates, but include wall panels with ribs and bent plates with a certain curvature. At the same time, the curvature of the bent plate is not limited to a single curve. The following embodiments of the present application are described by taking the thin-walled parts as thin-walled parts with curved surfaces as an example.

[0043] The direction along the two ends of the mold profile 110 is defined as the length direction for ease of description. Accordingly, the direction perpendicular to the two ends of the mold profile 110 is defined as the width direction. There are two outer edge surfaces 120 located at two ends of the mold profile 110.

[0044] 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.

[0045] The length of the blank 700 is greater than or equal to the developed length of the mold profile 110 in the length direction.

[0046] Exemplarily, the length of the blank 700 is equal to the unfolded length of the mold profile 110 in the length direction, that is, 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. Since the mold profile 110 is a curved surface, the length of the blank 700 is greater than the actual length of the mold profile 110. When the blank 700 is placed flat on the mold profile 110, both ends can be placed on the outer edge surface 120 and fixed on the corresponding fixing portion 200.

[0047] The position of the fixing part 200 is set reasonably, 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, so that the preforming of the blank 700 is completed.

[0048] Regardless of which of the above methods is used, the preforming method in the embodiment of the present application, compared with the commonly used method of placing the preforms in a vacuum-sealed form in an autoclave, eliminates the complicated vacuum bag preparation process, and greatly improves the preforming speed and efficiency.

[0049] 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 .

[0050] The movable end of the multi-dimensional motion mechanism 300 can move in multiple directions such as height, length, width, etc., 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.

[0051] 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.

[0052] The laser generating mechanism 400 moves with the active end of the multi-dimensional motion mechanism 300. The laser generating mechanism 400 is located above the preformed blank 700, and the emitted laser can irradiate 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 installed at the active end and follows the movement.

[0053] The laser process parameters can be set according to the laser creep process parameters as needed. For example, laser focus spot, format, laser preset temperature, laser holding time, path control, etc. In terms of path control, the laser generating mechanism 400 as a whole moves mainly along the length direction. In some areas, there may be a situation where the laser irradiates the area reciprocatingly along the length direction, or the laser irradiates reciprocatingly around the area. The laser generating mechanism 400 emits laser to irradiate the surface of the component at about 160°C.

[0054] 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 supplementary heating on local positions to achieve the purpose of rapid correction. The operation is more convenient, the number of rework is reduced, and the efficiency of obtaining the target surface of the part is greatly improved.

[0055] The laser creep forming device for thin-walled components of the present application promotes the conversion of more elastic internal energy into plastic work through the laser thermal effect, and partially releases the residual deformation, thereby reducing the internal stress of the material, further facilitating the creep aging forming of the material and improving the formability of the material.

[0056] Since the multi-dimensional motion mechanism 300 is combined to control the path and regulation of the laser generating mechanism 400, the use dimension of the laser creep forming equipment is expanded, and the difficult-to-form area can be heated multiple times, avoiding the process complexity of multiple calibration experiments in traditional autoclave creep aging forming, and reducing manufacturing costs.

[0057] In the above-mentioned laser creep forming device for thin-walled components, the blank 700 is squeezed toward the middle by the fixing part 200 so that it bends toward the mold surface 110 to complete preforming. The laser generating mechanism 400 follows the movement of the active end of the multi-dimensional motion mechanism 300, and emits laser to heat the laser irradiated area of ​​the blank 700. The laser thermal effect causes more elastic internal energy inside 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, which is more conducive to creep aging forming of the material and improving the formability of the material. Since the laser irradiation area can be controlled more accurately, creep aging forming can be performed accurately on each area of ​​the blank 700.

[0058] In some embodiments, see Figure 1~Figure 3 The multi-dimensional motion mechanism 300 includes a movable truss platform 310 and a mechanical arm 320 , wherein a fixed end of the mechanical arm 320 is connected to the movable truss platform 310 , and a movable end is connected to the laser generating mechanism 400 .

[0059] The movable truss platform 310 can move horizontally, such as along the length and width. The mechanical arm 320 has a high degree of freedom and can perform one or more actions of lifting, rotating, and translating. The combination of the two makes the laser generating mechanism 400 have a high degree of freedom and a wide irradiation range, which can cover different areas of the blank 700 and can quickly and directly irradiate the target area without affecting other areas.

[0060] In some embodiments, see Figure 1~Figure 3 , also includes:

[0061] The three-dimensional wide-area measuring device 500 has a measuring range covering the blank 700 .

[0062] 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 , respectively.

[0063] The three-dimensional wide-area measurement device 500 may include a global high-resolution 3D camera and a local high-resolution 3D camera.

[0064] Exemplarily, the three-dimensional wide-area measurement device 500 has an independent analysis system, which performs analysis based on image information captured by a global high-resolution 3D camera and a 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.

[0065] 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.

[0066] 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 range of 6mm-≥20m, and has the function of intercommunication between measurement test data and CAE simulation.

[0067] In some embodiments, see Figure 1 , the controller 600 is a computer, which has multiple data transmission interfaces as a receiving end and a control end.

[0068] Compared to the invisible creep aging forming in which both the blank 700 and the mold are placed in the autoclave, in this embodiment of the present application, during the laser creep forming process, the morphology, strain and other information of the workpiece can be monitored in real time during the forming process by the three-dimensional wide-area measurement device 500. The controller 600 monitors the feedback profile parameters of the three-dimensional wide-area measurement device 500 in real time and compares them with the target profile parameters (such as the controller 600 pre-stores the parameter information of the target profile). If a large difference is found in the area, the laser creep forming process can be adjusted in time until the profile of the part after springback is consistent with the target profile, which can ensure the overall formability of the part and avoid damage to the part caused by repeated forming.

[0069] In some embodiments, see Figure 1~Figure 3 Each of the fixing parts 200 includes a slide rail 210 disposed on the outer edge surface 120, a slider 220 matched with the slide rail 210, and a locking member 230 for locking the position of the slider 220. The extension direction of the slide rail 210 is perpendicular to the end surface of the mold profile 110, and the slider 220 is connected to the end surface of the blank 700.

[0070] The sliders 220 of the two fixing parts 200 respectively abut against the ends of the blank 700 and move toward the mold surface 110 along the corresponding slide rails 210. When reaching the current position (e.g., 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.

[0071] In some embodiments, see Figure 1~Figure 3 The locking member 230 includes a plurality of limiting holes 231 disposed on the outer edge surface 120 and along the extending direction of the slide rail 210. The slider 220 has a fixing hole 232 that matches the limiting hole 231 and is connected by a fixing pin. The slider 220 has a supporting portion that surrounds the end of the blank 700.

[0072] The locking member 230 of this structure has a simple structure and good reliability. The abutting portion of 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 will abut against the top surface of the lateral groove to achieve fixation. This type of slider 220 has a good fixing effect on the blank 700.

[0073] The present 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, comprising the following steps:

[0074] 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.

[0075] The two ends of the blank 700 are fixed by the fixing part 200 , and the blank 700 is bent toward the side where the mold surface 110 is located to form a pre-form.

[0076] In order to facilitate the shape correction and reduce the influence of impurities or oxides on the surface of the blank 700, in some embodiments, the blank 700 is also pre-treated, such as polishing the surface of the blank 700, wiping it with alcohol, and drying it for standby use. The blank 700 that has not been pre-treated can be called the original blank 700. If the blank 700 itself is relatively clean, the pre-treatment process does not need to be performed.

[0077] 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.

[0078] The above-mentioned laser creep forming method of thin-walled components has similar beneficial effects as the above-mentioned laser creep forming device, which will not be described in detail here.

[0079] According to the 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 to heat the laser irradiated area of ​​the blank 700 for laser creep aging forming. The laser creep process parameters include at least one of the laser focus spot, width, laser preset temperature, laser holding time and path control.

[0080] By adjusting the laser creep forming process parameters, the effect of laser creep forming can be adjusted to achieve a more ideal laser creep forming effect.

[0081] 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%.

[0082] The laser generating mechanism 400 under this condition can meet the laser creep process parameters. The laser can generate appropriate heat, which can convert more elastic internal energy of the blank 700 into plastic work through the thermal effect, and partially release the residual deformation, thereby reducing the internal stress of the blank 700, and further facilitating the creep aging forming of the material, thereby improving the material formability.

[0083] In some embodiments, the service life of the laser generating mechanism 400 is greater than 30,000 hours.

[0084] In some embodiments, it also includes:

[0085] 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.

[0086] The controller 600 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 400 and the multi-dimensional motion mechanism 300 .

[0087] Compared to the invisible creep aging forming in which both the blank 700 and the mold are placed in the autoclave, in this embodiment of the present application, during the laser creep forming process, the morphology, strain and other information of the workpiece can be monitored in real time during the forming process by the three-dimensional wide-area measurement device 500. The controller 600 monitors the feedback profile parameters of the three-dimensional wide-area measurement device 500 in real time and compares them with the target profile parameters (such as the controller 600 pre-stores the parameter information of the target profile). If a large difference is found in the area, the laser creep forming process can be adjusted in time until the profile of the part after springback is consistent with the target profile, which can ensure the overall formability of the part and avoid damage to the part caused by repeated forming.

[0088] In some embodiments, in the pre-formed state, two ends of the blank 700 are flush with two ends of the mold profile 110. The length of the formed component prepared in this way is consistent with the target component length.

[0089] 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.

[0090] In this step, the material constitutive equation of the blank 700 can be used to conduct basic experimental tests on the same material of the sheet to obtain creep properties and mechanical properties under different creep temperatures, creep stresses, and creep times, and to construct the material constitutive equation. After fitting through mathematical software, a subroutine is written and imported into the simulation software to perform finite element simulation on the laser creep aging forming process of the part. Then, the actual laser creep forming process parameters of the thin-walled part (such as temperature 140℃-220℃, stress 150MPa-400MPa, time 0.2h-6h) and the mold surface 110 are used as boundary conditions to obtain the simulation results after the creep aging forming of the part.

[0091] 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.

[0092] Among them, mathematical software includes MATLAB, FreeMat, etc., and simulation software includes ANSYS, Comsol, Marc, etc.

[0093] The technical solution of the present application is described below in conjunction with specific embodiments.

[0094] Example 1

[0095] The blank 700 is made of 2xxx aluminum alloy thin-walled flat plate with a thickness of 3 mm. 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 is 110, the length is 800mm, the width is 700mm, the mold base and the surface are made of Q345 steel, the surface roughness is Ra1.5, and the maximum working temperature is 300℃.

[0096] The laser irradiation component surface is controlled at 160°C, which is also the creep aging forming temperature. The power is adjusted to 60%, and the creep time is 2 hours. The blank 700 is measured in real time using a 3D wide-area measurement system and compared with the target profile. The thin-walled parts finally achieved the target forming effect.

[0097] The above technical solutions of the present invention are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the protection scope 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; A laser generating mechanism, connected to the movable end and facing the mold surface, is used to heat the laser irradiated area on the blank to perform laser creep aging forming; 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.

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: 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.

5. 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 4, 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.

6. The laser creep forming method of a thin-walled component according to claim 5, 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%.

7. The laser creep forming method of a thin-walled component according to claim 5, 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 profile 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.

8. The laser creep forming method of a thin-walled component according to claim 5, characterized in that: In the pre-formed state, two ends of the blank are flush with two ends of the mold surface.

9. The laser creep forming method for a thin-walled component according to any one of claims 5 to 8, 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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