A continuous annealing process for aero high temperature tubing

Abstract

This invention provides a continuous annealing process for high-temperature aerospace tubing. The invention relates to the field of metal heat treatment technology and includes the following steps: S1, placing multiple metal pipes parallel to each other on the top of a shelf with the bend opening facing downwards; S2, moving an annealing trolley through the multiple metal pipes via a notch; S3, controlling a lifting and positioning device and an induction heating device via a drive device to move relative to the bend opening; first, controlling the lifting and positioning device to lift and position the bend opening, then controlling the induction heating device to automatically complete induction heating by passing through the bend along a predetermined trajectory. This invention significantly improves the standardization of annealing operations, increases annealing efficiency, and greatly improves the quality of the annealed product.

Description

Technical Field

[0001] This application relates to the field of metal heat treatment, and more particularly to a continuous annealing process for high-temperature aerospace pipe fittings. Background Technology

[0002] Some aerospace high-temperature tubing components are made of iron-nickel-based superalloys. These components are widely used in the high-temperature systems of aero-engines, such as fuel, hydraulic, and air systems. Their bends are often formed through cold working, resulting in significant residual stress. Without annealing, this stress can lead to stress cracking and deformation failure under the high-temperature and vibration conditions of aerospace applications. Therefore, precise annealing of the bends is a critical process in the manufacturing of aerospace high-temperature tubing components. Electromagnetic induction heating can replace traditional centralized furnace heating. It only requires localized heating of the bends through an induction coil to relieve stress and restore material plasticity, thus meeting the structural strength and performance requirements of aerospace high-temperature tubing components.

[0003] The current induction heating process for bending sections of high-temperature aerospace pipe fittings is mostly done manually. Workers need to position each pipe fitting individually and then use an induction coil to heat the bending section. This not only results in extremely low annealing efficiency, making it difficult to meet the needs of mass production of aerospace parts, but also easily leads to insufficient alignment accuracy between the induction coil and the bending section due to the subjectivity of manual operation. This can cause problems such as uneven heating and annealing position deviation, making it impossible to guarantee the consistency of annealing of the bending section. Consequently, the annealing efficiency is low, and the pass rate of the annealed products cannot meet the stringent manufacturing standards of high-temperature aerospace pipe fittings. Summary of the Invention

[0004] In view of the above problems, embodiments of this application are proposed to provide a continuous annealing process for high-temperature aerospace tubing.

[0005] To address the aforementioned problems, this invention provides a continuous annealing process for high-temperature aerospace pipe fittings. This invention significantly improves the standardization of annealing operations, enhances annealing efficiency, and greatly improves the quality of annealed products.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: A continuous annealing process for high-temperature aerospace pipe fittings is disclosed, used for annealing metal pipes with bends. The process utilizes a continuous annealing apparatus, comprising an annealing trolley with a passage opening on its first side for the metal pipes to pass through. The annealing trolley contains a lifting and positioning device and an induction heating device. It also includes a drive device for controlling the movement of the lifting and positioning device and the induction heating device. The process includes the following steps: S1, placing multiple metal pipes parallel to each other on the upper end of a shelf with the bend opening facing downwards; S2, moving the annealing trolley and allowing the passage opening to pass through the multiple metal pipes; S3, controlling the lifting and positioning device and the induction heating device to move relative to the bend opening using the drive device; first, controlling the lifting and positioning device to lift and position the bend opening, then controlling the induction heating device to automatically complete induction heating by passing through the bend along a predetermined trajectory.

[0007] Preferably, the annealing trolley is also equipped with a protective gas pumping device, which continuously pumps protective gas into the annealing trolley after passing through multiple metal pipes via a notch.

[0008] Preferably, a first clamping component is provided on the upper side of the notch, and a second clamping component is provided on the lower side. After passing through multiple metal pipes through the notch, the first and second clamping components are controlled to extend.

[0009] Preferably, the lifting and positioning device includes a first telescopic rod, the telescopic end of which is fixed with a positioning body, and the side wall of the positioning body is provided with an air pump. When the positioning body is lifted to a predetermined position, the air pump is controlled to be turned on.

[0010] Preferably, the side wall of the positioning body is also provided with a detection switch. When the induction heating device rises to the predetermined position, the detection switch is in the second state and the pumping of protective gas stops.

[0011] Preferably, an airtight device is also provided on the outside of the annealing trolley. The airtight device includes an airtight body and a connecting pipe. The airtight body is electrically connected to a detection switch. When the detection switch is in the second state, it controls the airtight body to continuously expand and close the side away from the bend.

[0012] Preferably, the induction heating device includes a second telescopic rod, the telescopic end of which is fixed with a limiting body, and the side wall of the limiting body is provided with a wedge block, which is located on the movement path of the detection switch.

[0013] Preferably, the limiting body further includes a limiting seat, the top of which is provided with a rotating joint, and an induction heating coil is fixed to the rotating end of the rotating joint.

[0014] Preferably, the driving device includes a lateral driving component and a longitudinal driving component, and a vision detection component is further provided on the upper end of one side of the longitudinal driving component. The vision detection component is electrically connected to the lateral driving component and the longitudinal driving component.

[0015] Preferably, the metal pipe located in the middle position is induction heated first, and then the metal pipes on both sides are induction heated alternately at intervals.

[0016] The beneficial effects of this invention are as follows: Compared with existing technologies, this annealing process eliminates the need for overall heating and annealing of the metal pipe, achieving precise annealing of the bends while saving heating resources and improving annealing efficiency. Furthermore, the annealing process is fully automated, eliminating the need for manual operation and greatly enhancing the standardization of the annealing process. This significantly improves both annealing efficiency and the quality of the annealed product. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a process flow diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of a continuous annealing equipment for pipe fittings according to the present invention.

[0019] Figure 3 For the present invention Figure 2 A schematic diagram of the rear view structure.

[0020] Figure 4 For the present invention Figure 3 A schematic diagram of the AA-direction cross-section structure.

[0021] Figure 5 For the present invention Figure 4 A magnified structural diagram at point B.

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the positioning main body of the present invention.

[0023] Figure 7 This is a schematic diagram of the internal structure of the positioning body of the present invention.

[0024] In the diagram: 100, shelf; 200, metal pipe; 210, bend; 300, airtight device; 310, airtight main body; 320, connecting pipe; 400, annealing carriage; 410, transparent window; 420, moving caster; 430, first clamping assembly; 440, second clamping assembly; 500, vision inspection assembly; 600, lifting and positioning device; 610, first telescopic rod; 620, positioning main body; 621, positioning base; 622, first air duct. 623. Vertical guide post; 624. Return spring; 625. Positioning end; 626. Second air guide channel; 627. Air jet opening; 630. Air pump; 640. Detection switch; 700. Induction heating device; 710. Second telescopic rod; 720. Limiting body; 721. Limiting seat; 722. Wedge block; 723. Rotary joint; 730. Induction heating coil; 800. Drive device; 810. Longitudinal drive assembly; 820. Lateral drive assembly. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] To address the problems mentioned in the background art, see Appendix Figure 1 - Appendix Figure 7 A continuous annealing process for high-temperature aerospace pipe fittings is disclosed, used to anneal metal pipes 200 having a bend 210. The metal pipe 200 has a bend 210 and a straight section. The bend 210 is subsequently formed by cold working, and annealing is required to remove the internal stress present in the bend 210 to ensure structural strength.

[0027] This process uses a continuous annealing equipment for pipe fittings. The continuous annealing equipment for pipe fittings includes an annealing carriage 400. The first side of the annealing carriage 400 is provided with a passage opening for metal pipes 200 to pass through. The annealing carriage 400 is a horizontally placed rectangle that can simultaneously allow multiple metal pipes 200 to pass through and accommodate the bends 210 of the metal pipes 200. The annealing carriage 400 is equipped with a lifting and positioning device 600 and an induction heating device 700. Both the lifting and positioning device 600 and the induction heating device 700 can extend and retract in the vertical direction. The lifting and positioning device 600 can be lifted upwards and inserted into the opening side of the bend 210 for lifting and limiting. The induction heating device 700 can pass through the outside of the bend 210 to achieve induction heating at the bend 210.

[0028] The annealing trolley 400 also includes a drive device 800 that controls the movement of the lifting and positioning device 600 and the induction heating device 700. The drive device 800 can drive the lifting and positioning device 600 and the induction heating device 700 to move to a predetermined position, thereby realizing the electromagnetic induction heating of multiple metal pipes 200 in sequence. The annealing trolley 400 also includes a moving roller 420 and a transparent window 410. The moving roller 420 can move the annealing trolley 400 as a whole to a predetermined position in a convenient manner, facilitating its circulation and transfer within the workshop. The transparent window 410 allows for easy observation of the annealing trolley 400 and timely monitoring of the annealing process.

[0029] This process specifically includes the following steps: Step 1: Place multiple metal pipes 200 parallel to each other on the upper part of the shelf 100, with the opening of the bend 210 facing downwards; place multiple metal pipes 200 relatively neatly on the upper part of the shelf 100, and fix limit blocks on the upper part of the shelf 100 to ensure that the metal pipes 200 are placed relatively stably on the upper part of the shelf 100. The spacing between the limit blocks is adjustable and is determined according to the pipe size of the metal pipes 200.

[0030] Step 2: Move the annealing carriage 400 and pass it through the notch to the multiple metal pipes 200. The notch is located on the opposite side of the transparent window 410. It should be noted that the outer surface of the annealing carriage 400 should be as parallel as possible to the outer surface of the shelf 100. It can be arranged to fit snugly, thereby avoiding the multiple metal pipes 200 being in an inclined distribution with the inner wall surface of the annealing carriage 400. This ensures that the multiple metal pipes 200 are in a relatively neat straight line, reducing the difficulty of subsequent annealing positioning.

[0031] Step 3: Control the lifting and positioning device 600 and the induction heating device 700 to move relative to the opening of the bending part 210 via the drive device 800; first, control the lifting and positioning device 600 to lift and move to position and restrict the opening of the bending part 210, and then control the induction heating device 700 to pass through the bending part 210 according to the predetermined trajectory to automatically complete the induction heating.

[0032] The lifting and positioning device 600 moves from bottom to top and extends into one side of the opening of the bending part 210 for positioning, so as to ensure that the inner axis of the opening of the bending part 210 is perpendicular to the ground. The main electromagnetic induction heating part of the induction heating device 700 is sleeved on the outside of the lifting and positioning device 600, and can pass through the lifting and positioning device 600 from bottom to top and then be located on the outside of the bending part 210, thereby completing the electromagnetic induction heating of the outside of the bending part 210.

[0033] Step Four: After electromagnetic induction heating, the lifting and positioning device 600 and the induction heating device 700 are moved downwards to separate from the heated bent portion 210. The driving device 800 then drives them to move outwards, completing the individual electromagnetic heating of the remaining bent portions 210. After a certain period of overall electromagnetic heating, the entire metal pipe 200 is held at a predetermined temperature and then cooled. The holding time, cooling time, and cooling rate are determined based on the alloy composition of the metal pipe 200 and the annealing requirements. This is existing technology and does not involve improvements; therefore, it will not be elaborated further.

[0034] Specifically, the drive device 800 includes a transverse drive assembly 820 and a longitudinal drive assembly 810. A vision detection assembly 500 is also provided on the upper side of one side of the longitudinal drive assembly 810. The vision detection assembly 500 is electrically connected to the transverse drive assembly 820 and the longitudinal drive assembly 810. Both the longitudinal drive assembly 810 and the transverse drive assembly 820 can be selected as electric tracks, capable of driving the lifting and positioning device 600 and the induction heating device 700 to move linearly in both transverse and longitudinal directions, achieving stable and precise drive control to realize the sequential heating and annealing of multiple metal pipes 200.

[0035] The vision inspection component 500 is a high-definition industrial camera that captures the position of the bending section 210 in real time and automatically identifies the center coordinates. The drive device 800 automatically adjusts the position of the lifting and positioning device 600 and the induction heating device 700 according to the vision signal to achieve fully automatic and precise alignment without manual intervention.

[0036] During the centralized heating of multiple metal pipes 200, the metal pipe 200 located in the center is induction heated first, followed by alternating induction heating of the metal pipes 200 on both sides. This center-first, left-right alternating annealing sequence avoids heat accumulation and overheating deformation of the pipes caused by continuous heating, while ensuring consistent annealing conditions for each pipe. The pipes heated first can preheat the pipes heated later, resulting in high product stability. This method is suitable for the continuous production of large batches of high-temperature aerospace pipes, especially those requiring high annealing temperatures, and is also suitable for densely arranged metal pipes 200.

[0037] In summary, this process is specifically designed for continuous induction heating of high-temperature alloy bent pipes for aero-engines. It can stably eliminate bending stress and ensure the dimensional accuracy and uniformity of the pipe components. The metal pipe 200 is made of high-temperature alloy, and the bent section 210 is a stress concentration area, requiring precise annealing. The lifting and positioning device 600 achieves precise center positioning of the bent section 210, preventing annealing deviation. The induction heating device 700 extends into the interior of the bent section 210 along a preset trajectory, achieving uniform annealing of the inner wall. The annealing temperature, speed, and trajectory can be programmed. Through this annealing process, it is not necessary to heat and anneal the entire metal pipe 200, achieving precise annealing of the bent section 210 while saving heating resources and improving annealing efficiency. Furthermore, the annealing process is fully automated, eliminating the need for manual operation and greatly improving the standardization of annealing operations. This significantly enhances both annealing efficiency and the quality of the annealed product.

[0038] To reduce the impact of oxygen on the metal pipes 200 during annealing, a protective gas pumping device is installed inside the annealing carriage 400. After passing through multiple metal pipes 200 through a notch, protective gas is continuously pumped into the annealing carriage 400, forming an inert gas protective atmosphere inside the annealing carriage 400 and reducing the impact of oxygen on the metal pipes 200.

[0039] Argon or nitrogen gas with a purity of ≥99.99% is used as the protective gas. It fills the interior space of the carriage throughout the annealing process, isolating it from air and preventing oxidation, decarburization, and carbonization of the high-temperature alloy pipes, thus ensuring the surface quality and performance stability of the aerospace pipes. The protective gas flow rate can be automatically adjusted to maintain a slightly positive pressure environment.

[0040] A first abutting component 430 is provided above the notch, and a second abutting component 440 is provided below the notch. After passing through multiple metal pipes 200 through the notch, the first abutting component 430 and the second abutting component 440 are controlled to extend; as shown in the attached figure. Figure 4 As shown, after the first clamping component 430 and the second clamping component 440 extend out, they can clamp against the upper and lower sides of the metal pipe 200. On the one hand, they can clamp and limit the upper and lower sides of the metal pipe 200 to ensure the stability of multiple metal pipes 200 during the annealing process. On the other hand, they can reduce the area of ​​the gap and reduce the amount of protective gas overflowing from there.

[0041] An airbag sealing structure can also be provided on the side wall of the first clamping component 430 or the second clamping component 440. The expansion of the airbag sealing structure is controlled to fill the gap between two adjacent metal pipes 200, further reducing the area of ​​the passage gap and reducing the amount of protective gas leakage. When using the airbag sealing structure, it is necessary to control the distance between the bending part 210 and the passage gap to avoid the heat conduction during the heating process of the metal pipe 200 from damaging the airbag sealing structure. The outer surface of the airbag sealing structure can also be selected with heat insulation material to reduce the impact of heat conduction.

[0042] The first clamping component 430 and the second clamping component 440 can be flexible top blocks. After extending, they slightly clamp and fix the metal pipes 200 from the top and bottom, limiting the shaking and displacement of the pipes, ensuring the stable movement and accurate positioning of the annealing carriage 400, and keeping the induction heating position consistent. The lifting and lowering control of the first clamping component 430 and the second clamping component 440 can be achieved through a cylinder structure, with simultaneous extension and retraction on both sides, simultaneously clamping and limiting multiple metal pipes 200 from both sides.

[0043] Specifically, the lifting and positioning device 600 includes a first telescopic rod 610, with a positioning body 620 fixed to the telescopic end of the first telescopic rod 610. An air pump 630 is installed on the side wall of the positioning body 620. When the positioning body 620 is lifted to a predetermined position, the air pump 630 is turned on. The height of the predetermined position needs to be determined based on the dimensions of the metal pipe 200, specifically the height of the opening of the bend 210 from the ground. After the air pump 630 is turned on, it can quickly pump the protective gas from the annealing carriage 400 into the metal pipe 200, forming a protective atmosphere filled with protective gas inside the bend 210, thereby achieving inert gas protection for both the inner and outer sides of the bend 210.

[0044] The first telescopic rod 610 can be a servo-electric telescopic rod, offering high lifting position accuracy. The top of the positioning body 620 has an arc-shaped positioning surface, which matches the shape of the inner wall of the bending section 210, achieving center positioning. As the positioning body 620 gradually rises, it can correct for slight inclinations in the bending section 210. The positioning body 620 can be shaped like a frustum or a cone, extending upwards into the opening of the bending section 210 to achieve positioning. Furthermore, the aforementioned shapes of the positioning body 620 can adapt to metal pipes 200 of different diameters, offering strong positioning adaptability and a simple positioning process.

[0045] A detection switch 640 is also provided on the side wall of the positioning body 620. When the induction heating device 700 is at the bottom position, the detection switch 640 is in the first state, which can continuously pump the protective gas. When the induction heating device 700 rises to the predetermined position, the detection switch 640 is in the second state and stops pumping the protective gas. This prevents the airflow inside the bending part 210 from continuing to flow rapidly and randomly, thereby ensuring that the protective gas inside the bending part 210 is in a relatively stable state.

[0046] The detection switch 640 can be selected as a contact or photoelectric sensor to identify whether the induction heating device 700 has reached the annealing working position. When the device is detected to be in position, the protective gas pump is automatically shut off to prevent airflow from interfering with the temperature field of the induction coil and disrupting the protective atmosphere within the bending section 210, while also reducing gas consumption.

[0047] When the detection switch 640 is selected as a photoelectric sensor, the opening and closing of the air pump 630 is controlled solely by the circuit signal to achieve opening and closing control; the detection switch 640 can also be selected as a contact-type touch switch, which can form a protective barrier in the pumping path of the protective gas to prevent the continuous pumping of the protective gas.

[0048] See attached document Figure 6 Appendix Figure 7 The internal structure of the positioning body 620 is explained using a touch-sensitive interface: The positioning body 620 includes a positioning base 621, a vertical guide post 623 fixed to the upper end of the positioning base 621, and a positioning end 625 sleeved on the outside of the vertical guide post 623. The positioning end 625 is slidably connected to the vertical guide post 623, and a return spring 624 is provided between the positioning end 625 and the positioning base 621. Under the action of the return spring 624, the positioning end 625 is normally in a lifted state, which can control the top of the positioning body 620 to be in a closed state. During the process of the positioning body 620 lifting the opening of the bending part 210, the positioning end 625 gradually squeezes against the opening of the bending part 210. During this process, the return spring 624 is gradually compressed. At this time, the top of the second air guide channel 626 opens, allowing protective gas to enter the bending part 210 from the top.

[0049] A first air guide channel 622 is formed within the positioning base 621, and an air pump 630 is installed on the outside of the first air guide channel 622. A second air guide channel 626 is formed inside the vertical guide column 623, and a jet opening 627 is provided at the top of the second air guide channel 626. Under normal conditions, the jet opening 627 is in a closed state, blocked by the positioning end 625. When the positioning end 625 is pressed, it moves downward and is offset from the jet opening 627. After the air pump 630 is started, it can spray the protective gas in the annealing carriage 400 through the first air guide channel 622 and the second air guide channel 626, and finally spray it into the bending part 210 from the jet opening 627, so that the bending part 210 is filled with protective gas.

[0050] The aforementioned detection switch 640 can penetrate the positioning base 621 and partially extend into the first gas guide channel 622. When the detection switch 640 is pressed and activated, it closes the bend between the first gas guide channel 622 and the second gas guide channel 626 to achieve timely closure of the gas channel and prevent the continuous pumping of protective gas from damaging the protective atmosphere. The aforementioned detection switch 640 is electrically connected to the air pump 630 in conjunction with the electrical contact detection device, and simultaneously controls the air pump 630 to be de-energized and enter the second state to stop the pumping of protective gas.

[0051] An airtight device 300 is also provided on the outside of the annealing trolley 400. The airtight device 300 can seal the side of the metal pipe 200 away from the bend 210, further preventing gas from the outside environment from entering the metal pipe 200 from the end away from the bend 210, and ensuring that the protective atmosphere formed in the bend 210 is relatively stable.

[0052] Specifically, the airtight device 300 includes an airtight body 310 and a connecting pipe 320. A pump can also be installed inside the connecting pipe 320 to pump gas into the airtight body 310 and control its expansion. The airtight body 310 is electrically connected to a detection switch 640. When the detection switch 640 is in its second state, it controls the airtight body 310 to continuously expand and seal the side away from the bend 210. The airtight body 310 can be an inflatable airbag that expands and seals before induction heating begins, creating a partially sealed annealing chamber inside the carriage. This improves insulation, reduces the amount of protective gas used, and prevents external air from entering, ensuring a stable and reliable annealing environment.

[0053] It should be noted that the number of airtight devices 300 is determined based on the number of metal pipes 200. After the annealing trolley 400 moves to the predetermined position, the airtight main body 310 and the connecting pipes 320 are manually arranged. The airtight main body 310 is initially in a contracted state, allowing the protective gas to fill the metal pipes 200 gently, controlling the interior of the metal pipes 200 to maintain a protective atmosphere. After the positioning body 620 is lifted, the protective gas can be quickly pumped to minimize air residue. After the positioning body 620 finishes pumping the protective gas, the airtight device 300 is then kept in a closed state, ensuring a stable protective atmosphere inside the metal pipes 200 while reducing the leakage of protective gas.

[0054] Specifically, the induction heating device 700 includes a second telescopic rod 710, with a limiting body 720 fixed at the telescopic end of the second telescopic rod 710. A wedge block 722 is provided on the side wall of the limiting body 720, and the wedge block 722 is located on the moving path of the detection switch 640. After the second telescopic rod 710 controls the limiting body 720 to rise to a predetermined height, the wedge block 722 squeezes the detection switch 640 on the outside, ultimately controlling the state of the air pump 630 and the airtight device 300.

[0055] In summary, the second telescopic rod 710 drives the induction heating structure to move up and down, and the wedge block 722 triggers the detection switch 640 as it moves up and down, so as to achieve accurate output of position signal and control the protective gas and airtight device to act synchronously. The whole system is stable and responds quickly.

[0056] Specifically, the limiting body 720 also includes a limiting seat 721, with a rotating joint 723 on the top of the limiting seat 721. An induction heating coil 730 is fixed to the rotating end of the rotating joint 723. First, the limiting seat 721 is raised to a predetermined height position by the second telescopic rod 710. Then, the induction heating coil 730 is rotated along the trajectory of the bending part 210 by the rotating joint 723 to gradually bypass the bending part 210, thereby achieving all-round electromagnetic induction heating.

[0057] The rotary joint 723 can drive the induction heating coil 730 to deflect by a predetermined angle, so that the coil can move along the arc trajectory of the bending part 210, achieving uniform annealing of the inner wall of the bend and ensuring that the hardness and grain size are consistent throughout the entire area. It should be noted that the size of the induction heating coil 730 is larger than the outer diameter of the bending part 210, and there is a sufficient gap between the two to avoid collisions during the deflection of the induction heating coil 730. Before controlling the deflection, the rotary joint 723 is first controlled to be raised to the virtual center position or near the virtual center position of the bending part 210 to ensure that the gap between the induction heating coil 730 and the bending part 210 remains relatively consistent during the rotation.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A continuous annealing process for high-temperature aerospace pipe fittings, used for annealing metal pipes (200) with bends (210), employing a continuous annealing apparatus for pipe fittings, characterized in that: The continuous annealing equipment for pipe fittings includes an annealing carriage (400), the first side of which is provided with a passage opening for a metal pipe (200) to pass through. The annealing carriage (400) is provided with a lifting and positioning device (600) and an induction heating device (700) inside. It also includes a drive device (800) for controlling the movement of the lifting and positioning device (600) and the induction heating device (700), and includes the following steps: S1. Place multiple metal pipes (200) in parallel on the upper end of the shelf (100), with the opening of the bend (210) facing downwards; S2, the moving annealing trolley (400) will pass through multiple metal pipes (200) through the notch; S3. The lifting and positioning device (600) and the induction heating device (700) are controlled by the drive device (800) to move relative to the opening of the bending part (210); first, the lifting and positioning device (600) is controlled to lift and move to position and restrict the opening of the bending part (210), and then the induction heating device (700) is controlled to pass through the bending part (210) according to the predetermined trajectory to automatically complete the induction heating.

2. An aircraft high temperature tube continuous annealing process as defined in claim 1 wherein, The annealing trolley (400) is also equipped with a protective gas pumping device, which continuously pumps protective gas into the annealing trolley (400) after passing through multiple metal pipes (200) through a notch.

3. The continuous annealing process for high-temperature aerospace tubing according to claim 2, characterized in that, The first clamping component (430) is provided on the upper side of the notch, and the second clamping component (440) is provided below it. After passing through multiple metal pipes (200) through the notch, the first clamping component (430) and the second clamping component (440) are controlled to extend.

4. The continuous annealing process for high-temperature aerospace tubing according to claim 2, characterized in that, The lifting and positioning device (600) includes a first telescopic rod (610), and a positioning body (620) is fixed at the telescopic end of the first telescopic rod (610). An air pump (630) is provided on the side wall of the positioning body (620). When the positioning body (620) is lifted to the predetermined position, the air pump (630) is controlled to be in the open state.

5. The continuous annealing process for high-temperature aerospace tubing according to claim 4, characterized in that, The side wall of the positioning body (620) is also provided with a detection switch (640). When the induction heating device (700) rises to the predetermined position, the detection switch (640) is in the second state and stops pumping the protective gas.

6. The continuous annealing process for high-temperature aerospace tubing according to claim 5, characterized in that, An airtight device (300) is also provided on the outside of the annealing trolley (400). The airtight device (300) includes an airtight body (310) and a connecting pipe (320). The airtight body (310) is electrically connected to a detection switch (640). When the detection switch (640) is in the second state, it controls the airtight body (310) to continuously expand and close the side away from the bend (210).

7. The continuous annealing process for high-temperature aerospace tubing according to claim 5, characterized in that, The induction heating device (700) includes a second telescopic rod (710), and a limiting body (720) is fixed at the telescopic end of the second telescopic rod (710). A wedge block (722) is provided on the side wall of the limiting body (720), and the wedge block (722) is located on the moving path of the detection switch (640).

8. The continuous annealing process for high-temperature aerospace tubing according to claim 7, characterized in that, The limiting body (720) also includes a limiting seat (721), the top of which is provided with a rotating joint (723), and the rotating end of the rotating joint (723) is fixed with an induction heating coil (730).

9. The continuous annealing process for high-temperature aerospace tubing according to claim 1, characterized in that, The driving device (800) includes a lateral driving component (820) and a longitudinal driving component (810). A vision detection component (500) is also provided on the upper side of one side of the longitudinal driving component (810). The vision detection component (500) is electrically connected to the lateral driving component (820) and the longitudinal driving component (810).

10. The continuous annealing process for high-temperature aerospace tubing according to claim 9, characterized in that, First, induction heating is applied to the metal pipe (200) located in the middle position, and then induction heating is applied to the metal pipes (200) on both sides alternately at intervals.

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