Aluminum lithium alloy residual stress relief heat treatment apparatus

Abstract

The application provides an aluminum-lithium alloy residual stress elimination heat treatment device and particularly relates to a heat treatment device. The aluminum-lithium alloy residual stress elimination heat treatment device comprises a rack, a movable rack slidably connected to the rack in the length direction, a track fixedly connected to the rack, a bearing plate slidably connected to the movable rack in the height direction, and a clamping assembly arranged on the bearing plate and used for clamping a workpiece. The aluminum-lithium alloy residual stress elimination heat treatment device provided by the application is provided with multiple work stations arranged in the length direction in sequence and a movable rack moving along the track, so that the workpiece can sequentially complete all processes of solid solution heating, quenching, stretching and heat preservation on one assembly line, the workpiece does not need to be transferred between different devices for multiple times, the transfer time between processes is shortened, the risk of temperature drop and surface damage of the workpiece in the transfer process is avoided, and the heat treatment efficiency and quality stability are improved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment technology, specifically to a heat treatment device for relieving residual stress in aluminum-lithium alloys. Background Technology

[0002] Aluminum-lithium alloys are characterized by low density, high specific strength, and excellent fatigue resistance, making them widely used in the aerospace field. The heat treatment process of aluminum-lithium alloys usually includes multiple steps such as solution heating, quenching, and pre-stretching to eliminate residual stress generated during processing and heat treatment, and to ensure the dimensional stability and mechanical properties of the parts. Existing residual stress elimination heat treatment equipment for aluminum-lithium alloys usually adopts a split layout, with each step completed in an independent device. The workpiece needs to be transferred multiple times between the heating furnace, quenching tank, stretching machine, and aging furnace.

[0003] Existing aluminum-lithium alloy residual stress relief heat treatment equipment requires multiple transfers of workpieces between processes, which can be done by hoisting or manual handling. The transfer process is time-consuming and cumbersome. The temperature of the workpiece drops rapidly during the transfer, affecting the processing effect of subsequent processes. At the same time, multiple transfers also increase the risk of workpiece surface damage, resulting in low overall processing efficiency and making it difficult to meet the efficiency requirements of mass production.

[0004] Therefore, it is necessary to provide a new heat treatment device for relieving residual stress in aluminum-lithium alloys to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the low efficiency and temperature loss caused by the need for multiple transfers between different devices in existing aluminum-lithium alloy residual stress relief heat treatment devices. This invention provides an aluminum-lithium alloy residual stress relief heat treatment device. The device uses a drive assembly to move a movable frame along a track. Combined with the raised and recessed contours of the track at each workstation and the automatic lifting and lowering of the support plate, it completes the automatic transfer and processing of the workpiece between workstations. This achieves continuous processing of solution heating, quenching, stretching, and heat holding, improving heat treatment efficiency and quality stability, while reducing operational difficulty and equipment investment.

[0006] To solve the above-mentioned technical problems, the present invention provides an aluminum-lithium alloy residual stress relief heat treatment device, comprising a frame and a movable frame slidably connected to the frame along its length. A track is fixedly connected to the frame, and a bearing plate is slidably connected to the movable frame along its height. A clamping assembly for clamping workpieces is provided on the bearing plate. A driving assembly for driving the movable frame to move along the track is provided on the movable frame. A connecting rod is fixedly connected to the bottom of the bearing plate, and a pulley is fixedly connected to the connecting rod. The frame is sequentially provided with a loading station, a heating station, a quenching station, a stretching station, and a heat preservation station along its length. The movable frame passes through each station sequentially under the drive of the driving assembly to complete the corresponding process.

[0007] Preferably, the track has an upwardly raised section at the heating station, and a heating cover is fixedly connected to the frame at the heating station. When the movable frame passes through this section, the pulley at the bottom of the support plate is raised accordingly, sending the support plate into the heating cover fixed above the frame. When the pulley moves to the highest point of the raised section, the heating cover just covers the support plate and the workpiece on it.

[0008] Preferably, the track has a downwardly recessed track section at the quenching station, and a quenching tank fixedly connected to the frame is provided at the quenching station. When the bearing plate passes through the recessed section, it descends and immerses the bearing plate and the workpiece into the quenching tank fixed below the frame.

[0009] Preferably, the clamping assembly includes a fixed clamping seat fixedly connected to the support plate and a movable clamping seat slidably connected to the support plate. A movable block is fixedly connected to the bottom of the movable clamping seat. A movable groove is formed on the support plate along the length of the frame. The movable block is elastically connected to the inner wall of the movable groove by a return spring. A trigger head is fixedly connected to the movable clamping seat. The trigger head is used to move one end of the workpiece at the stretching station to achieve stretching.

[0010] Preferably, the stretching station is provided with a vertically arranged electric push rod fixedly connected to the frame. The extended end of the electric push rod is fixedly connected to a trigger frame. The trigger frame is used to extend downward to the height of the trigger head when the support plate moves to the stretching station, so that the trigger head is blocked by the trigger frame, thereby applying a stretching force to the workpiece to pull the movable clamping seat to achieve the stretching of the workpiece.

[0011] Preferably, the electric actuator is a servo electric actuator, which is used to control the time when the trigger frame descends to the bottom so as to control the time when the trigger frame blocks the trigger head, thereby controlling the amount of stretching on the workpiece.

[0012] Preferably, both the fixed clamping seat and the movable clamping seat include two elastically connected clamping plates, and the clamping surfaces of both clamping plates are inlaid with ceramic gaskets.

[0013] Preferably, the track has an upwardly raised section at the insulation station, and an insulation cover is fixedly connected to the frame at the insulation station. When the movable frame passes through this section, the pulley at the bottom of the support plate is raised, sending the support plate into the insulation cover fixed above the frame. When the pulley moves to the highest point of the raised section, the insulation cover just covers the support plate and the workpiece on it.

[0014] Preferably, the drive assembly includes a drive motor fixedly connected to the movable frame and a gear fixedly connected to the output end of the drive motor. A rack is fixedly connected to the frame, and the gear meshes with the rack.

[0015] Preferably, both sides of the movable frame are fixedly connected to a first slider with a T-shaped cross-section, and the frame is provided with a first slide groove that matches the size of the first slider. The first slide groove is opened along the length direction of the frame. Both sides of the bearing plate are fixedly connected to a second slider with a T-shaped cross-section, and the movable frame is provided with a second slide groove that matches the size of the second slider. The second slide groove is opened along the height direction.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: The residual stress relief heat treatment device for aluminum-lithium alloys proposed in this invention, through the arrangement of multiple workstations along the length direction and the movable frame moving along the track, enables the workpiece to complete all processes of solution heating, quenching, stretching and heat preservation sequentially on a single production line. This eliminates the need for multiple transfers between different equipment, shortens the transfer time between processes, avoids the risk of temperature drop and surface damage to the workpiece during the transfer process, and improves heat treatment efficiency and quality stability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a heat treatment device for relieving residual stress in aluminum-lithium alloys according to the present invention. Figure 2 This is a schematic diagram showing the disassembled movable frame and support plate of the heat treatment device for relieving residual stress in aluminum-lithium alloy according to the present invention. Figure 3 This is a diagram showing the state of the trigger frame blocking the trigger head in a heat treatment device for relieving residual stress in aluminum-lithium alloys according to the present invention. Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5This is a diagram showing the state of the movable frame of the aluminum-lithium alloy residual stress relief heat treatment device of the present invention moving to the heating station. Figure 6 This is a schematic diagram of the clamping assembly of a heat treatment device for relieving residual stress in aluminum-lithium alloys according to the present invention.

[0018] Figure label: 1. Frame, 11. Movable frame, 111. First slider, 112. First slide groove, 113. Bearing plate, 114. Second slider, 115. Second slide groove, 116. Connecting rod, 117. Pulley, 118. Track, 12. Loading station, 13. Heating station, 131. Heating cover, 14. Quenching station, 141. Quenching tank, 15. Stretching station, 151. Electric push rod, 153. Trigger frame, 154. Trigger head, 16. Insulation station, 161. Insulation cover, 2. Clamping assembly, 21. Fixed clamping seat, 22. Movable clamping seat, 23. Movable groove, 24. Movable block, 25. Return spring, 26. Clamping plate, 27. Ceramic gasket, 3. Drive assembly, 31. Drive motor, 32. Gear, 33. Rack. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Please see Figures 1 to 6As shown in the figure, an embodiment of the present invention provides a heat treatment device for relieving residual stress in aluminum-lithium alloys, including a frame 1 and a movable frame 11 slidably connected to the frame 1 along its length. The frame 1 can be welded from structural steel. The movable frame 11 is slidably connected to the frame 1 via a first slider 111 and can reciprocate along the track 118. A bearing plate 113 is slidably connected to the movable frame 11 via a vertical guide rail. The bearing plate 113 is used to support and fix the workpiece. A vertically downward extending connecting rod 116 is fixedly connected to the bottom of the bearing plate 113. A pulley 117 is installed at the lower end of the connecting rod 116. The pulley 117 contacts the upper surface of the track 118. The bearing plate 113 is supported by the pulley 117 on the track. The lifting and lowering are achieved by rolling along the track 118. The movable frame 11 is equipped with a drive assembly 3, which drives the entire movable frame 11 to move along the track 118. The frame 1 is divided into five workstations along its length. The loading workstation 12 is used to load the workpiece onto the support plate 113. The heating workstation 13 is used to heat the workpiece. The quenching workstation 14 is used to rapidly cool the workpiece. The stretching workstation 15 is used to apply pre-stretching to the workpiece to eliminate residual stress. The heat preservation workstation 16 is used to heat preservation treatment of the workpiece. Driven by the drive assembly 3, the movable frame 11 passes through each workstation in sequence and stops at each workstation to complete the corresponding process operation. There is no need to transfer the workpiece between different equipment, thus realizing continuous processing.

[0023] Each of the left and right sides of the movable frame 11 is fixedly connected to a first slider 111 with a T-shaped cross-section. Two first grooves 112, matching the size of the first sliders 111, are provided at corresponding positions on the inner wall of the frame 1. The first grooves 112 extend along the length of the frame 1. The first sliders 111 are embedded in the first grooves 112 and can slide along them. The T-shaped structure prevents the movable frame 11 from shifting vertically and horizontally, allowing movement only along its length. Similarly, each of the left and right sides of the support plate 113 is fixedly connected to a second slider 114 with a T-shaped cross-section. Two second grooves 115, matching the size of the second sliders 114, are provided at corresponding positions on the inner wall of the movable frame 11. The second grooves 115 extend along the height direction. The second sliders 114 are embedded in the second grooves 115 and can slide up and down along them. The T-shaped structure prevents the support plate 113 from shifting horizontally, allowing movement only along its height.

[0024] The track 118 is machined into an upwardly raised profile at the heating station 13. The height of the raised profile is determined according to the installation height of the heating cover 131. When the movable frame 11 moves the support plate 113 to the heating station 13, the pulley 117 at the bottom of the support plate 113 gradually rolls upward along the raised section of the track 118. The connecting rod 116 rises accordingly, pushing the support plate 113 to slide upward along the vertical guide rail on the movable frame 11. During the rise of the support plate 113, the workpiece on it rises accordingly and gradually enters the heating cover 131 fixed above the frame 1. When the pulley 117 rolls to the highest point of the raised section, the support plate 113 rises to the highest position. At this time, the lower edge of the heating cover 131 is exactly flush with the upper surface of the support plate 113, completely covering the support plate 113 and the workpiece on it inside the heating cover 131. The heating cover 131 can be equipped with an electric heating tube or resistance wire, which radiates heat to the workpiece after being energized.

[0025] The track 118 is machined into a downwardly concave profile at the quenching station 14. The depth of the concavity is determined according to the liquid level in the quenching tank 141. When the movable frame 11 moves the support plate 113 to the quenching station 14, the pulley 117 at the bottom of the support plate 113 gradually rolls downward along the concave section of the track 118, and the connecting rod 116 descends accordingly. The support plate 113 slides downward along the vertical guide rail on the movable frame 11. During the descent of the support plate 113, the workpiece on it descends accordingly. The workpiece is gradually immersed in the quenching liquid in the quenching tank 141 fixed below the frame 1. When the pulley 117 rolls to the lowest point of the recessed section, the support plate 113 descends to the lowest position. At this time, the workpiece is completely immersed in the quenching liquid for rapid quenching and cooling. The quenching tank 141 should be equipped with a circulation pipeline for the inlet and outlet of the quenching liquid. After quenching is completed, the movable frame 11 continues to move forward, the pulley 117 rolls out along the rising slope of the recessed section, the support plate 113 rises accordingly, and the workpiece leaves the quenching liquid.

[0026] Additionally, a fixed clamping seat 21 is fixed on the upper surface of the support plate 113 along the length of the frame 1 for clamping one end of the workpiece. A movable clamping seat 22 is also slidably connected to the upper surface of the support plate 113 for clamping the other end of the workpiece. A movable block 24 is fixedly connected to the bottom of the movable clamping seat 22. A movable groove 23 extending along the length direction is opened at a corresponding position on the support plate 113. The movable block 24 is embedded in the movable groove 23 and can slide along the movable groove 23. A return spring 25 is connected between the movable block 24 and the inner wall of one end of the movable groove 23. The return spring 25, in its natural state, keeps the movable clamping seat 22... Approaching the fixed clamping seat 21, keeping the workpiece in a relaxed state, a trigger head 154 is fixedly connected to the outer end face of the movable clamping seat 22. The trigger head 154 extends upward and is used to contact the external triggering mechanism at the stretching station 15. When the trigger head 154 is blocked, the movable clamping seat 22 stops moving, while the support plate 113 continues to move forward. The fixed clamping seat 21 moves forward with the support plate 113, and the movable clamping seat 22 slides backward relative to the support plate 113, thereby applying a stretching force to the workpiece. The return spring 25 is compressed during the stretching process. When the workpiece is removed, the return spring 25 drives the movable clamping seat 22 to return to the initial position.

[0027] A vertically mounted electric push rod 151 is fixedly installed on the frame 1 at the stretching station 15. The extended end of the electric push rod 151 faces downward, and a trigger frame 153 is fixedly connected to its end. The trigger frame 153 is arranged in an inverted U-shape, and its lower end is located directly above the travel path of the trigger head 154. When the support plate 113 moves to the stretching station 15, the electric push rod 151 receives a control signal, and its extended end extends downward, causing the trigger frame 153 to descend to the height of the trigger head 154. The movable frame 11 continues to move forward, and the support plate 113... The trigger head 154 contacts and is blocked by the trigger frame 153, preventing the trigger head 154 from moving forward. Meanwhile, the support plate 113 continues to move forward under the action of the drive assembly 3. The fixed clamping seat 21 moves forward with the support plate 113, and the movable clamping seat 22 slides backward relative to the support plate 113. The workpiece is stretched, and the amount of stretching is determined by the timing of the lowering of the trigger frame 153 controlled by the electric push rod 151. The later the trigger frame 153 is raised, the longer the trigger head 154 is blocked, the greater the relative sliding distance of the movable clamping seat 22, and the greater the amount of stretching.

[0028] In specific implementation, the electric push rod 151 should be a servo electric push rod 151. The servo electric push rod 151 has an integrated position encoder, which can accurately control the position and time of extension and retraction. At the stretching station 15, after the support plate 113 moves into place, the servo electric push rod 151 controls the trigger frame 153 to descend to the height of the trigger head 154 according to the preset program. After the trigger head 154 is blocked, the support plate 113 continues to move forward, the movable clamping seat 22 slides relative to each other, and the workpiece is stretched. The servo electric push rod 151 controls the distance of relative sliding of the movable clamping seat 22 by controlling the length of time the trigger frame 153 remains in the descending state, thereby accurately controlling the amount of stretching. After stretching is completed, the servo electric push rod 151 controls the trigger frame 153 to rise rapidly and release the obstruction.

[0029] Furthermore, the fixed clamping seat 21 and the movable clamping seat 22 of the clamping assembly 2 adopt the same configuration. Both clamping seats include two opposing clamping plates 26, which are connected by a spring or elastic washer to provide clamping force. Each of the opposing surfaces of the two clamping plates 26 is inlaid with a ceramic washer 27. The ceramic washer 27 is characterized by high temperature resistance, wear resistance, and non-chemical reaction with aluminum-lithium alloy. In use, one end of the workpiece is inserted between the two clamping plates 26, and the workpiece is clamped by the spring force. The ceramic washer 27 contacts the workpiece, preventing the metal clamping surface from sticking to the aluminum-lithium alloy or causing indentation at high temperatures. The clamping force between the two clamping plates 26 can be adjusted by adjusting the preload of the spring to accommodate workpieces of different thicknesses.

[0030] The track 118 is machined into an upwardly raised profile at the insulation station 16. The height of the raised profile is determined according to the installation height of the insulation cover 161. The structure of the insulation station 16 is similar to that of the heating station 13, but the heating power inside the insulation cover 161 is lower. It is mainly used for heat preservation of the workpiece rather than high-temperature solidification. When the movable frame 11 moves the support plate 113 to the insulation station 16, the pulley 117 at the bottom of the support plate 113 gradually rolls upward along the raised section of the track 118. The connecting rod 116 rises accordingly, pushing the support plate 113 to slide upward along the vertical guide rail on the movable frame 11. During the rise of the support plate 113, the workpiece on it rises accordingly and gradually enters the insulation cover 161 fixed above the frame 1. When the pulley 117 rolls to the highest point of the raised section, the support plate 113 rises to the highest position. At this time, the lower edge of the heat insulation cover 161 is just flush with or slightly lower than the upper surface of the support plate 113, completely covering the support plate 113 and the workpiece on it inside the heat insulation cover 161. The heat insulation cover 161 should be equipped with a heat insulation layer and a low-power heating element to heat the workpiece. After the heat insulation is completed, the movable frame 11 moves to the end point and removes the workpiece.

[0031] In addition, the drive assembly 3 includes a drive motor 31 fixedly connected to the movable frame 11 and a gear 32 fixedly connected to the output end of the drive motor 31. The drive motor 31 is a servo motor or a stepper motor. A rack 33 is fixedly connected to the frame 1 along the length direction. The tooth surface of the rack 33 faces upward. The gear 32 meshes with the rack 33. When the drive motor 31 rotates, the gear 32 rolls on the rack 33. Since the rack 33 is fixed on the frame 1 and does not move, the rolling of the gear 32 is converted into the linear movement of the movable frame 11 along the direction of the rack 33. The forward and reverse rotation of the drive motor 31 controls the forward and backward movement of the movable frame 11, and the rotation speed of the drive motor 31 controls the moving speed of the movable frame 11.

[0032] Working principle: When the device is in operation, the workpiece is first placed flat on the support plate 113 at the loading station 12. The two ends of the workpiece are clamped by the fixed clamping seat 21 and the movable clamping seat 22. The drive motor 31 is started, and the movable frame 11 is driven to move along the track 118 to the heating station 13 through the gear 32 and rack 33. When the movable frame 11 enters the heating station 13, the pulley 117 at the bottom of the support plate 113 rises along the raised section of the track 118, lifting the support plate 113 and the workpiece into the heating hood 131. The heating hood 131 performs solid solution heating on the workpiece. After heating is completed, the movable frame 11 continues to move forward into the quenching station 14. The pulley 117 descends along the recessed section of the track 118, and the support plate 113 and the workpiece are immersed in the quenching tank 141 for rapid quenching. After rapid quenching, the movable frame 11 enters the stretching station 15. The electric push rod 151 drives the trigger frame 153 to descend to the height of the trigger head 154. The trigger head 154 is blocked by the trigger frame 153, the movable clamping seat 22 stops moving while the bearing plate 113 continues to move forward, and the fixed clamping seat 21 moves forward with the bearing plate 113 to apply a pre-stretching force to the workpiece and eliminate residual stress. After stretching, the electric push rod 151 retracts the trigger frame 153, and the movable frame 11 continues to move forward into the heat preservation station 16. The pulley 117 rises along the raised section of the track 118 to lift the bearing plate 113 and the workpiece into the heat preservation cover 161 for aging heat preservation. After heat preservation, the movable frame 11 continues to move forward to the end point, and the finished workpiece can be unloaded.

[0033] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heat treatment apparatus for relieving residual stress in aluminum-lithium alloys, comprising a frame (1) and a movable frame (11) slidably connected to the frame (1) along its length, characterized in that: The frame (1) is fixedly connected to a track (118), and the movable frame (11) is slidably connected to a bearing plate (113) along the height direction. The bearing plate (113) is provided with a clamping assembly (2) for clamping the workpiece. The movable frame (11) is provided with a driving assembly (3) for driving the movable frame (11) to move along the track (118). The bottom of the bearing plate (113) is fixedly connected to a connecting rod (116), and a pulley (117) is fixedly connected to the connecting rod (116). The frame (1) is provided with a loading station (12), a heating station (13), a quenching station (14), a stretching station (15), and a heat preservation station (16) in sequence along the length direction. The movable frame (11) passes through each station in sequence under the drive of the driving assembly (3) to complete the corresponding process.

2. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: The track (118) has an upwardly raised section at the heating station (13). A heating cover (131) is fixedly connected to the frame (1) at the heating station (13). When the movable frame (11) passes through this section, the pulley (117) at the bottom of the bearing plate (113) is raised and the bearing plate (113) is sent into the heating cover (131) fixed above the frame (1). When the pulley (117) moves to the highest point of the raised section, the heating cover (131) just covers the bearing plate (113) and the workpiece on it.

3. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: The track (118) has a downwardly recessed section at the quenching station (14), and a quenching groove (141) is fixedly connected to the frame (1) at the quenching station (14). When the bearing plate (113) passes through the recessed section, it descends and immerses the bearing plate (113) and the workpiece into the quenching groove (141) fixed below the frame (1).

4. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: The clamping assembly (2) includes a fixed clamping seat (21) fixedly connected to the support plate (113) and a movable clamping seat (22) slidably connected to the support plate (113). A movable block (24) is fixedly connected to the bottom of the movable clamping seat (22). A movable groove (23) is provided on the support plate (113). The movable groove (23) is opened along the length direction of the frame (1). The movable block (24) is elastically connected to the inner wall of the movable groove (23) through a return spring (25). A trigger head (154) is fixedly connected to the movable clamping seat (22). The trigger head (154) is used to move one end of the workpiece at the stretching station (15) to achieve stretching.

5. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 4, characterized in that: At the stretching station (15), a vertically arranged electric push rod (151) is fixedly connected to the frame (1). The extended end of the electric push rod (151) is fixedly connected to a trigger frame (153). The trigger frame (153) is used to extend downward to the height of the trigger head (154) when the support plate (113) moves to the stretching station (15), so that the trigger head (154) is blocked by the trigger frame (153), thereby applying a stretching force to the workpiece to pull the movable clamping seat (22) to achieve the stretching of the workpiece.

6. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 5, characterized in that: The electric push rod (151) is a servo electric push rod (151). The electric push rod (151) is used to control the time when the trigger frame (153) descends to the bottom so as to control the time when the trigger frame (153) blocks the trigger head (154) and thus control the amount of stretching on the workpiece.

7. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 4, characterized in that: Both the fixed clamping seat (21) and the movable clamping seat (22) include two elastically connected clamping plates (26), and the clamping surfaces of the two clamping plates (26) are inlaid with ceramic gaskets (27).

8. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: The track (118) has an upwardly raised section at the insulation station (16). An insulation cover (161) is fixedly connected to the frame (1) at the insulation station (16). When the movable frame (11) passes through this section, the pulley (117) at the bottom of the bearing plate (113) is raised and the bearing plate (113) is sent into the insulation cover (161) fixed above the frame (1). When the pulley (117) moves to the highest point of the raised section, the insulation cover (161) just covers the bearing plate (113) and the workpiece on it.

9. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: The drive assembly (3) includes a drive motor (31) fixedly connected to the movable frame (11) and a gear (32) fixedly connected to the output end of the drive motor (31). A rack (33) is fixedly connected to the frame (1), and the gear (32) meshes with the rack (33).

10. The heat treatment apparatus for relieving residual stress in aluminum-lithium alloys according to claim 1, characterized in that: Both sides of the movable frame (11) are fixedly connected to a first slider (111) with a T-shaped cross section. The frame (1) is provided with a first slide groove (112) that matches the size of the first slider (111). The first slide groove (112) is opened along the length direction of the frame (1). Both sides of the bearing plate (113) are fixedly connected to a second slider (114) with a T-shaped cross section. The movable frame (11) is provided with a second slide groove (115) that matches the size of the second slider (114). The second slide groove (115) is opened along the height direction.

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