A heat treatment process and apparatus for high-strength steel in aerospace applications

Abstract

This invention discloses a heat treatment process for high-strength steel used in aerospace applications. This process improves the tempering speed while ensuring the quality of the final product. The invention also discloses a heat treatment device for high-strength steel in aerospace applications, comprising a main body consisting of a shell, a base, and a water tank. The shell is located at the upper end of the base and is fixedly connected. The water tank is located on one side of the base and is fixedly connected. Two operating ports are symmetrically opened on the side of the shell away from the water tank. A U-shaped induction coil is fixedly connected to the side wall of the shell. The U-shaped induction coil is used to induction heat the annular high-strength steel to reach the temperature required for quenching. During use, after the tempering operation is completed, the annular high-strength steel is cleaned and dried for direct subsequent processing.

Description

Technical Field

[0001] This invention relates to the field of heat treatment of high-strength steel, and more particularly to a heat treatment process and apparatus for aerospace high-strength steel. Background Technology

[0002] Currently, high-strength steel is generally used as the raw material in aerospace parts manufacturing. Ring-shaped high-strength steel is widely used in the production of aerospace parts. In practical applications, to improve the quality of ring-shaped high-strength steel, heat treatment is required. However, traditional heat treatment processes have the following problems:

[0003] In current heat treatment processes for ring-shaped high-strength steel, quenching is generally performed directly. However, simple quenching can easily lead to greater brittleness in the finished product, resulting in a relatively short service life. Therefore, tempering is often added. In existing technologies, there are generally two methods for cooling during tempering: natural cooling and oil cooling. While the former can achieve slow cooling, the cooling rate is extremely slow. Although the latter has a fast cooling rate, the large temperature difference between the initially high-temperature steel and the oil can easily cause the steel to crack. Therefore, how to resolve this issue needs to be considered. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a heat treatment device for high-strength steel in aerospace applications. This device optimizes the tempering process, improving the tempering speed while ensuring the tempering effect. Furthermore, after the tempering operation is completed, the annular high-strength steel is cleaned and dried, facilitating subsequent processing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A heat treatment process for high-strength steel used in aerospace applications includes the following steps:

[0007] Step 1: Select high-quality high-strength steel electroslag ingots or consumable ingots as starting materials. Then, through the billet forging process, gradually deform the original cast structure and optimize its internal structure until the desired ring shape is achieved, and make ring-shaped high-strength steel components.

[0008] Step 2: Heat the ring-shaped high-strength steel component to 850-870℃, then place it in a quenching device for liquid cooling to complete the quenching process.

[0009] Step 3: Preheat the three groups of oils in the heat treatment device. The temperature ranges of the three groups of oils are 495℃-505℃, 245℃-255℃ and 25℃-35℃, respectively.

[0010] Step 4: Place the quenched ring-shaped high-strength steel component into a heat treatment device for tempering.

[0011] Step 5: Remove the ring-shaped high-strength steel component after the tempering process is complete.

[0012] This invention also discloses a heat treatment device for high-strength steel in aerospace applications, employing the aforementioned processing technology. The device includes a main body comprising a shell, a base, and a water tank. The shell is located at the upper end of the base and is fixedly connected. The water tank is located on one side of the base and is also fixedly connected. Two symmetrical operating ports are provided on the side of the shell away from the water tank. A U-shaped induction coil is fixedly connected to the inner wall of the shell. The U-shaped induction coil is used for induction heating of the annular high-strength steel to achieve the temperature required for quenching. An annular high-strength steel placement module is also included, used to hang the annular high-strength steel for convenient heat treatment and oil quenching. The annular high-strength steel placement module includes a connecting block, a U-shaped plate fixedly connected to the side wall of the connecting block, a gearbox mounted on the upper horizontal part of the U-shaped plate, a rectangular bar fixedly connected to the output shaft of the gearbox, and L-shaped plates fixedly connected to all four sides of the rectangular bar. A rotating shaft is provided through the vertical part of each L-shaped plate, and an annular hanging groove is provided on each rotating shaft. The oil immersion module includes four tanks located on the upper part of the base. Heat treatment oil is stored in the three tanks closest to the U-shaped induction coil. The temperature of the heat treatment oil in the three tanks decreases sequentially in the direction away from the U-shaped induction coil, thereby improving the oil quenching effect.

[0013] Preferably, the system further includes a moving module, which, together with the oil immersion module, performs the oil immersion treatment. The moving module includes a drive motor mounted on the side wall of the housing. The output shaft of the drive motor extends into the housing and is fixedly connected to a threaded rod. A slider is threaded onto the threaded rod. A guide rod is fixedly connected between the inner walls of the left and right sides of the housing. The guide rod passes through the slider and is slidably connected. A U-shaped slide bar is provided through the slider. A connecting plate is fixedly connected to the lower end of the upper horizontal part of the U-shaped slide bar. The lower end of the connecting plate is elastically connected to the upper end of the slider via a second spring. The lower end of the U-shaped slide bar is fixedly connected to the upper end of the connecting block. An electric telescopic rod is fixedly connected to the inner top of the housing. A hollow strip is fixedly connected to the telescopic end of the electric telescopic rod. Four trapezoidal plates are fixedly connected to the lower end of the hollow strip. A guide wheel is fixedly connected to the upper end of the U-shaped slide bar.

[0014] Preferably, it also includes three temperature regulation modules, each of which is used to ensure that the oil temperature in the corresponding tank is uniform. Each temperature regulation module includes a heating element fixedly connected to the bottom of the tank. A temperature sensor is installed on the inner wall of the tank. A semiconductor cooling element is installed on the side of the housing away from the water tank, and the cooling end of the semiconductor cooling element extends into the tank.

[0015] Preferably, the system further includes an auxiliary processing module, which includes a toothed plate fixedly connected to the inner wall of multiple tanks near the water tank side. The input shaft of the transmission passes through the lower horizontal part of the U-shaped plate and is fixedly connected to a transmission gear. The transmission gear engages with multiple toothed plates. A second bevel gear is fixedly connected to the end of each rotating shaft away from the corresponding rectangular strip. A hollow tube is fixedly connected to the lower end of the connecting block. A first bevel gear is fixedly connected to the outer side of the hollow tube. The first bevel gear meshes with multiple second bevel gears.

[0016] Preferably, the threaded rod extends to the outside at the end away from the drive motor and is mounted on a rotating disk via a one-way bearing. A second piston cylinder is fixedly connected to the side of the housing away from the drive motor. A second piston plate that can slide up and down is provided inside the second piston cylinder. A connecting strip is rotatably connected to the side of the rotating disk away from the threaded rod at an eccentric position. The other end of the connecting strip is rotatably connected to the lower end of the second piston plate. A filter box is fixedly connected to the side of the housing away from the operating port. The inner top space of the second piston cylinder is connected to the space of the filter box away from the drive motor via a third one-way pipe. The space of the filter box away from the third one-way pipe is connected to a hollow strip via an air inlet pipe. Multiple air inlets are provided at the inner bottom of the hollow strip. The inner top space of the second piston cylinder is connected to the inside of the water tank via a second one-way pipe.

[0017] Preferably, a first piston cylinder is fixedly connected to the upper end of the housing, the inner top space of the first piston cylinder is connected to the outside through a guide port, a first piston plate that can slide up and down is provided inside the first piston cylinder, and the upper end of the first piston plate is elastically connected to the inner top of the first piston cylinder through a first spring.

[0018] Preferably, the inner top space of the second piston cylinder is connected to the inner bottom space of the first piston cylinder through a first one-way pipe, and a U-shaped hollow plate is fixedly connected to the inner wall of the housing on the side away from the U-shaped induction coil. Multiple nozzles are provided on the inner side wall of the U-shaped hollow plate, and the inner bottom space of the first piston cylinder is connected to the interior of the U-shaped hollow plate through a discharge pipe.

[0019] Preferably, a one-way valve is installed in the first one-way pipe, the second one-way pipe, and the third one-way pipe. The one-way valve inside the second one-way pipe directs the flow from the bottom of the water tank into the top space inside the second piston cylinder. The one-way valve inside the third one-way pipe directs the flow from the filter box into the top space inside the second piston cylinder. The one-way valve inside the first one-way pipe directs the flow from the top space inside the second piston cylinder into the internal space inside the first piston cylinder.

[0020] Preferably, a normally open solenoid valve is installed inside the discharge pipe, and the normally open solenoid valve opens and closes synchronously with the drive motor.

[0021] Compared with the prior art, the beneficial effects of this invention are as follows:

[0022] 1. By quenching and then tempering, and by slowly cooling down during the tempering process, the actual process can be optimized to make the actual high-strength steel more tough and ductile, thereby improving the service life and reliability of the steel.

[0023] 2. It is equipped with multiple oil tanks at different temperatures. During the tempering operation, only the drive motor needs to be started. With the cooperation of the guide wheel, the second spring and the ring high-strength steel placement module, the ring high-strength steel can be passed through multiple oils of different temperatures in sequence to slowly cool down and achieve the purpose of tempering. This process is a continuous process and does not require the staff to transfer the steel multiple times, which facilitates the actual operation.

[0024] 3. During the horizontal movement of the annular high-strength steel in the oil, multiple annular high-strength steel rings move in the oil while rotating around the transmission output shaft, and then rotating again around the rotating shaft. In this process, the relative motion between the annular high-strength steel rings and the oil is more comprehensive, and the rotation of the rotating shaft allows the contact surface between the annular high-strength steel rings and the oil to continuously change, allowing the annular high-strength steel rings to fully contact the oil, achieving more comprehensive and efficient cooling treatment.

[0025] 4. Each time the module moves back under the action of the second spring, it will shake multiple times due to inertia and eventually stop moving in opposite directions. This shaking process can shake off the oil that is easily detached, which not only avoids the waste of oil, but also facilitates the subsequent cleaning operation.

[0026] 5. After the annular high-strength steel enters the tank containing the cleaning agent, it can make full contact with the cleaning agent, thereby achieving self-cleaning operation, optimizing the actual process, and eliminating the need for subsequent separate cleaning operations.

[0027] 6. During the forward rotation of the threaded rod, the second piston plate will reciprocate up and down. In conjunction with multiple one-way valves, some of the gas inside the housing will be extracted, thereby achieving the purpose of removing and filtering the overflowing toxic fumes, reducing the environmental pollution caused by the fumes to the surrounding environment. At the same time, the gas and liquid are synchronously pressed into the inner bottom space of the first piston cylinder.

[0028] 7. During the reciprocating process of the second piston plate, the bottom space of the first piston cylinder is eventually in a state of liquid at the bottom and gas at the top. When the power is off, the first piston plate moves down, first pressing out the water, then pressing out the gas. After rinsing, it is then air-dried to ensure that the treated annular high-strength steel is dry and clean, thus facilitating subsequent processing.

[0029] In summary, this processing technology and equipment enhance the toughness and ductility of high-strength steel, improving its service life and reliability. Furthermore, during the tempering operation, it increases the tempering speed while ensuring the tempering effect, thereby improving overall efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a heat treatment device for high-strength steel in aerospace proposed in this invention.

[0031] Figure 2 for Figure 1 Rear view diagram;

[0032] Figure 3 for Figure 1 A cross-sectional schematic diagram;

[0033] Figure 4 This is a structural diagram of the slider section, the annular high-strength steel placement module, and the U-shaped induction coil.

[0034] Figure 5 for Figure 4 A schematic diagram after removing the U-shaped induction coil;

[0035] Figure 6 for Figure 5 Enlarged view of the lower half;

[0036] Figure 7 This is a cross-sectional view of the second piston cylinder;

[0037] Figure 8 This is a bottom view showing the connection between the hollow strips and the trapezoidal plate.

[0038] In the diagram: 1. Housing, 2. Base, 3. Semiconductor cooling component, 4. Operating port, 5. First piston cylinder, 6. Second piston cylinder, 7. First one-way pipe, 8. Discharge pipe, 9. Water tank, 10. Second one-way pipe, 11. Drive motor, 12. Filter box, 13. Inlet pipe, 14. Third one-way pipe, 15. Tank, 16. Heating element, 17. Toothed plate, 18. Temperature sensor, 19. Slider, 20. Threaded rod, 21. Electric telescopic rod, 22. Hollow strip, 23. Trapezoidal plate, 24. First piston... 25. Plug plate, 26. First spring, 27. U-shaped hollow plate, 28. Nozzle, 29. Air inlet, 30. U-shaped induction coil, 31. U-shaped plate, 32. Sliding strip, 33. Connecting plate, 34. Guide wheel, 35. Second spring, 36. Connecting block, 37. Hollow tube, 38. Transmission gear, 39. Rectangular strip, 40. First bevel gear, 41. L-shaped plate, 42. Rotating shaft, 43. Second bevel gear, 44. Second piston plate, 45. Connecting strip, 46. Rotating disc. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0040] This invention discloses a heat treatment process for high-strength steel used in aerospace applications, comprising the following steps:

[0041] Step 1: Select high-quality high-strength steel electroslag ingots or consumable ingots as starting materials. Then, through the billet forging process, gradually deform the original cast structure and optimize its internal structure until the desired ring shape is achieved, and make ring-shaped high-strength steel components.

[0042] Step 2: Heat the ring-shaped high-strength steel component to 850-870℃, then place it in a quenching device for liquid cooling to complete the quenching process.

[0043] Step 3: Preheat the three groups of oils in the heat treatment device. The temperature ranges of the three groups of oils are 495℃-505℃, 245℃-255℃ and 25℃-35℃, respectively.

[0044] Step 4: Place the quenched ring-shaped high-strength steel component into a heat treatment device for tempering.

[0045] Step 5: Remove the ring-shaped high-strength steel component after the tempering process is complete.

[0046] Reference Figures 1-3The present invention also discloses a heat treatment device for high-strength steel in aerospace applications, employing the aforementioned processing technology. The device includes a main body, which consists of a shell 1, a base 2, and a water tank 9. The shell 1 is located at the upper end of the base 2 and is fixedly connected. The water tank 9 is located on one side of the base 2 and is filled with clean water and is fixedly connected. Two operating ports 4 are symmetrically opened on the side of the shell 1 away from the water tank 9. A U-shaped induction coil 29 is fixedly connected to the inner wall of the shell 1. The U-shaped induction coil 29 is used to induction heat the annular high-strength steel to achieve the temperature required for quenching.

[0047] Reference Figure 4 As one embodiment of the present invention, it also includes an annular high-strength steel placement module, which is used to hang the annular high-strength steel for convenient heat treatment and oil quenching treatment. The annular high-strength steel placement module includes a connecting block 35, and a U-shaped plate 30 is fixedly connected to the side wall of the connecting block 35. A gearbox 38 is installed at the upper end of the horizontal part of the U-shaped plate 30. The gearbox 38 is an accelerator box, that is, the speed of the input shaft is lower than that of the output shaft. A rectangular bar 39 is fixedly connected to the output shaft of the gearbox 38. L-shaped plates 41 are fixedly connected to all four sides of the rectangular bar 39. A rotating shaft 42 is provided through the vertical part of each L-shaped plate 41. An annular hanging groove is opened on each rotating shaft 42.

[0048] Reference Figure 3 , Figure 8 As one embodiment of the present invention, it also includes an oil immersion module, which includes four tanks 15 formed on the upper end of the base 2. The three tanks 15 closest to the U-shaped induction coil 29 are filled with heat treatment oil. It should be noted that the remaining tank 15 is filled with a cleaning agent to enable subsequent cleaning operations. The temperature of the heat treatment oil in the three tanks 15 decreases sequentially in the direction away from the U-shaped induction coil 29, thereby improving the oil quenching effect. Furthermore, the temperature of the heat treatment oil in the first tank 15 closest to the U-shaped induction coil 29 is about 500°C, the temperature of the heat treatment oil in the second tank 15 is about 250°C, and the temperature of the heat treatment oil in the third tank 15 is about 30°C.

[0049] As one embodiment of the present invention, a moving module is also included. The moving module and the oil immersion module together realize the oil immersion treatment. The moving module includes a drive motor 11 installed on the side wall of the housing 1. The output shaft of the drive motor 11 extends into the interior of the housing 1 and is fixedly connected to a threaded rod 20. A slider 19 is threadedly connected to the threaded rod 20. A guide rod is fixedly connected between the inner walls of the left and right sides of the housing 1. The guide rod passes through the slider 19 and is slidably connected. A spiral slide bar 31 is provided through the slider 19. A connecting plate 32 is fixedly connected to the lower end of the upper horizontal part of the spiral slide bar 31. The lower end of the connecting plate 32 is elastically connected to the upper end of the slider 19 through a second spring 34. The lower end of the spiral slide bar 31 is fixedly connected to the upper end of the connecting block 35. An electric telescopic rod 21 is fixedly connected to the inner top of the housing 1. A hollow strip 22 is fixedly connected to the telescopic end of the electric telescopic rod 21. Four trapezoidal plates 23 are fixedly connected to the lower end of the hollow strip 22. A guide wheel 33 is fixedly connected to the upper end of the spiral slide bar 31.

[0050] In one embodiment of the present invention, three temperature regulation modules are also included. Each temperature regulation module is used to ensure uniform oil temperature within its corresponding tank 15. Each temperature regulation module includes a heating element 16 fixedly connected to the bottom of the tank 15. The heating element 16 uses electric heating, which is prior art. A temperature sensor 18 is installed on the inner wall of the tank 15. A semiconductor cooling element 3 is installed on the side of the housing 1 away from the water tank 9. The semiconductor cooling element 3 consists of a semiconductor cooling chip and a heat dissipation fan, ensuring a good cooling effect. Furthermore, the semiconductor cooling element 3 here can be replaced with other heat exchange elements. The cooling end of the semiconductor cooling element 3 extends into the tank. Inside the tank 15, further, when the temperature of the heat treatment oil in the tank 15 closest to the U-shaped induction coil 29 drops below 495°C, the heating element 16 is activated to heat it up. After the temperature reaches 500°C, the heating element 16 is turned off. When the temperature of the heat treatment oil in the tank 15 exceeds 505°C, the semiconductor cooling element 3 is activated. When the temperature reaches 500°C, the semiconductor cooling element 3 is turned off, thereby ensuring that the internal temperature is controlled within the required range (the tank 15 closest to the U-shaped induction coil 29 is controlled at 495°C-505°C, the second tank 15 is controlled at 245°C-255°C, and the third tank 15 is controlled at 25°C-35°C).

[0051] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6As one embodiment of the present invention, it also includes an auxiliary processing module. The auxiliary processing module includes a toothed plate 17 fixedly connected to the inner wall of the multiple tanks 15 near the water tank 9. The input shaft of the gearbox 38 passes through the lower horizontal part of the U-shaped plate 30 and is fixedly connected to a transmission gear 37. The transmission gear 37 cooperates with the multiple toothed plates 17. A second bevel gear 43 is fixedly connected to the end of each rotating shaft 42 away from the corresponding rectangular bar 39. A hollow tube 36 is fixedly connected to the lower end of the connecting block 35. A first bevel gear 40 is fixedly connected to the outside of the hollow tube 36. The first bevel gear 40 meshes with the multiple second bevel gears 43. Furthermore, the above-mentioned auxiliary processing module and the structure inside the annular high-strength steel placement module are all made of tungsten alloy, which has a high melting point and will not be affected by high temperatures of 600-700 degrees Celsius.

[0052] Reference Figure 2 , Figure 3 , Figure 7 In one embodiment of the present invention, the threaded rod 20 extends to the outside from the end away from the drive motor 11, and a rotating disk 46 is mounted on it through a one-way bearing. When the threaded rod 20 rotates in the forward direction, it can drive the rotating disk 46 to rotate. When the threaded rod 20 rotates in the reverse direction, it will not drive the rotating disk 46 to rotate. A second piston cylinder 6 is fixedly connected to the side of the housing 1 away from the drive motor 11. A second piston plate 44 that can slide up and down is provided inside the second piston cylinder 6. A connecting strip 45 is rotatably connected to the side of the rotating disk 46 away from the threaded rod 20. The other end of the connecting strip 45 is rotatably connected to the lower end of the second piston plate 44. A filter box 12 is fixedly connected to the side of the housing 1 away from the operation port 4. A filter element is installed inside the filter box 12 to filter the flue gas. The inner top space of the second piston cylinder 6 and the space of the filter box 12 away from the drive motor 11 are connected through a third one-way pipe 14. The space on one side away from the third one-way tube 14 is connected to the hollow strip 22 through the air inlet pipe 13. Multiple air inlets 28 are provided on the inner bottom of the hollow strip 22. The inner top space of the second piston cylinder 6 is connected to the inside of the water tank 9 through the second one-way tube 10. The upper end of the housing 1 is fixedly connected to the first piston cylinder 5. The inner top space of the first piston cylinder 5 is connected to the outside through a guide port. The first piston cylinder 5 is provided with a first piston plate 24 that can slide up and down. The upper end of the first piston plate 24 is elastically connected to the inner top of the first piston cylinder 5 through the first spring 25. The inner top space of the second piston cylinder 6 is connected to the inner bottom space of the first piston cylinder 5 through the first one-way tube 7. The inner wall of the housing 1 away from the U-shaped induction coil 29 is fixedly connected to the U-shaped hollow plate 26. Multiple nozzles 27 are provided on the inner side wall of the U-shaped hollow plate 26. The inner bottom space of the first piston cylinder 5 is connected to the inside of the U-shaped hollow plate 26 through the discharge pipe 8.

[0053] In one embodiment of the present invention, one-way valves are installed in the first one-way pipe 7, the second one-way pipe 10, and the third one-way pipe 14. The flow direction of the one-way valve inside the second one-way pipe 10 is one-way from the bottom of the water tank 9 into the top space inside the second piston cylinder 6. The flow direction of the one-way valve inside the third one-way pipe 14 is one-way from the filter box 12 into the top space inside the second piston cylinder 6. The flow direction of the one-way valve inside the first one-way pipe 7 is one-way from the top space inside the second piston cylinder 6 into the internal space of the first piston cylinder 5. A normally open solenoid valve is installed inside the discharge pipe 8. The normally open solenoid valve opens and closes synchronously with the drive motor 11. When the normally open solenoid valve is energized, it is in a sealed state, and when it is de-energized, it is in a conductive state.

[0054] In this invention, during specific use, the quenched annular high-strength steel is suspended from the operation port 4 near the U-shaped induction coil 29 onto the annular hanging slots of multiple rotating shafts 42. Then, the U-shaped induction coil 29 is activated to heat the annular high-strength steel. The specific heating time is designed according to actual needs to ensure that the temperature of the heated annular high-strength steel reaches 700°C and is maintained for a period of time. Subsequently, the drive motor 11 is activated to rotate forward. The rotation of the drive motor 11 will drive the slider 19 to move away from the drive motor 11. When the slider 19 moves, it will drive the guide wheel 33 to move through the loop slide bar 31. When the guide wheel 33 contacts the inclined surface of the trapezoidal plate 23, it will be pushed down and compressed. Spring 34, through the use of the loop slide 31, drives the annular high-strength steel placement module to move downward until the placement module is completely submerged in the oil in the tank 15. When the guide wheel 33 passes the lower horizontal part of the trapezoidal plate 23, the loop slide 31 and the placement module will move horizontally. When the guide wheel 33 moves to the side of the trapezoidal plate 23 away from the drive motor 11, under the elastic action of the second spring 34, the loop slide 31 and the placement module will move upward quickly. In this way, during the movement, the placement module will pass through multiple oils of different temperatures, achieving slow heat exchange and cooling to achieve the purpose of tempering. Compared with the existing technology, this operation improves the tempering speed while ensuring the quality of the finished product.

[0055] During the aforementioned horizontal movement in the oil, the transmission gear 37 moves relative to the corresponding toothed plate 17. During this movement, it rotates. Using the gearbox 38, the rectangular bar 39 can rotate. The rotation of the rectangular bar 39 will drive the multiple L-shaped plates 41 to rotate, thereby causing the rotating shaft 42 to rotate around the output shaft of the gearbox 38. Since the multiple second bevel gears 43 are all meshed with the first bevel gear 40, this rotation will cause the bevel gears to move relative to each other, causing the multiple second bevel gears 43 to rotate and drive the rotating shaft 42 to rotate. During this process, the multiple annular high-strength steel rings can move away from the drive motor 11 in the oil while rotating around the output shaft of the gearbox 38 and then rotating around the rotating shaft 42. During this process, the relative movement between the annular high-strength steel rings and the oil is more comprehensive, and the rotation of the rotating shaft 42 allows the contact surface between the annular high-strength steel rings and the oil to continuously change, allowing the annular high-strength steel rings to fully contact the oil, achieving more comprehensive and efficient cooling treatment.

[0056] Furthermore, after the annular high-strength steel enters the tank 15 containing the cleaning agent, it can come into full contact with the cleaning agent, thereby achieving a self-cleaning operation. Until the slider 19 moves to the end of the threaded rod 20 away from the drive motor 11, it finally returns to its initial height under the elastic action of the second spring 34.

[0057] In addition, it is worth mentioning that each time the placement module moves back under the action of the second spring 34, it will shake multiple times under the action of inertia, and finally stop moving in opposite directions. This shaking process can shake off the oil that is easily detached from it, which not only avoids the waste of oil, but also facilitates the subsequent cleaning operation.

[0058] It should be noted that the forward rotation of the threaded rod 20 will also drive the rotating disk 46 to rotate. Using the connecting strip 45, the second piston plate 44 can move up and down reciprocally. In conjunction with the first one-way pipe 7, the second one-way pipe 10, the third one-way pipe 14 and the internal one-way valve, when the second piston plate 44 moves down, it will generate one-way gas flow inside the housing 1, the hollow strip 22, the filter box 12 and the top of the second piston cylinder 6. At the same time, it will generate one-way liquid flow from the water tank 9 to the top of the second piston cylinder 6. When the second piston plate 44 moves up, it will simultaneously press the water and gas into the bottom space inside the first piston cylinder 5, and push the first piston plate 24 to move up, compressing the first spring 25 (at this time, the normally open solenoid valve in the discharge pipe 8 is energized and closed). That is, during the forward rotation of the threaded rod 20, some gas inside the housing 1 will be extracted, thereby achieving the purpose of extracting and filtering the overflowing toxic fumes. At the same time, the gas and liquid are synchronously pressed into the bottom space inside the first piston cylinder 5.

[0059] Ultimately, the bottom space inside the first piston cylinder 5 is in a state of liquid at the bottom and gas at the top. When the slider 19 moves to a position where the threaded rod 20 is away from the end of the drive motor 11, the drive motor 11 is turned off. After the drive motor 11 is turned off, the normally open solenoid valve is de-energized and turned on. Under the elastic action of the first spring 25, the first piston plate 24 moves down, first pressing out the water, and then pressing out the gas. During the process of pressing out the water, the water is sprayed out from the nozzle 27 and sprayed onto multiple annular high-strength steel rings that have been cleaned with cleaning agent, washing off the residual cleaning agent on them. After the gas is sprayed out, it can achieve the effect of air drying, ensuring that the treated annular high-strength steel rings are dry and clean, thus facilitating subsequent processing.

[0060] After completing the overall operation, remove the annular high-strength steel ring from another operating port 4, and then start the drive motor 11 to rotate in the reverse direction. Furthermore, it can be controlled by a PLC so that each time the drive motor 11 is de-energized, the electric telescopic rod 21 will be activated to retract or extend. That is, after the drive motor 11 moves the slider 19 to the end of the threaded rod 20 away from the drive motor 11 and the power is de-energized, the electric telescopic rod 21 will be energized to retract, causing the hollow bar 22 to move multiple trapezoidal plates 23 upwards. Conversely, the drive motor 11 will reverse, causing the slider 19 to move back to its initial position, and the electric telescopic rod 21 will be energized to extend. Figure 3 The state is then repeated.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat treatment process for high-strength steel used in aerospace applications, characterized in that, Includes the following steps: Step 1: Select high-quality high-strength steel electroslag ingots or consumable ingots as starting materials. Then, through the billet forging process, gradually deform the original cast structure and optimize its internal structure until the desired ring shape is achieved, and make ring-shaped high-strength steel components. Step 2: Heat the ring-shaped high-strength steel component to 850-870℃, then place it in a quenching device for liquid cooling to complete the quenching process. Step 3: Preheat the three groups of oils in the heat treatment device. The temperature ranges of the three groups of oils are 495℃-505℃, 245℃-255℃ and 25℃-35℃, respectively. Step 4: Place the quenched ring-shaped high-strength steel component into a heat treatment device for tempering. Step 5: Remove the ring-shaped high-strength steel component after the tempering process is complete; Using a heat treatment apparatus for high-strength steel in aerospace applications, comprising: The main body of the device consists of a shell (1), a base (2) and a water tank (9). The shell (1) is located at the upper end of the base (2) and is fixedly connected. The water tank (9) is located on one side of the base (2) and is fixedly connected. Two operation ports (4) are symmetrically opened on the side of the shell (1) away from the water tank (9). A U-shaped induction coil (29) is fixedly connected to the inner wall of the shell (1). The U-shaped induction coil (29) is used to induction heat the annular high-strength steel to reach the temperature required for quenching. A ring-shaped high-strength steel placement module is used to hang ring-shaped high-strength steel for easy heat treatment and oil quenching. The ring-shaped high-strength steel placement module includes a connecting block (35). A U-shaped plate (30) is fixedly connected to the side wall of the connecting block (35). A gearbox (38) is installed on the upper horizontal part of the U-shaped plate (30). A rectangular bar (39) is fixedly connected to the output shaft of the gearbox (38). An L-shaped plate (41) is fixedly connected to all four sides of the rectangular bar (39). A rotating shaft (42) is provided through the vertical part of each L-shaped plate (41). A ring-shaped hanging groove is opened on each rotating shaft (42). The oil immersion module includes four tanks (15) on the upper end of the base (2). The three tanks (15) near the U-shaped induction coil (29) contain heat treatment oil. The temperature of the heat treatment oil in the three tanks (15) decreases sequentially in the direction away from the U-shaped induction coil (29), thereby improving the oil quenching effect. The moving module and the oil immersion module work together to achieve the oil immersion treatment. The moving module includes a drive motor (11) installed on the side wall of the housing (1). The output shaft of the drive motor (11) extends into the interior of the housing (1) and is fixedly connected to a threaded rod (20). A slider (19) is threadedly connected to the threaded rod (20). A guide rod is fixedly connected between the inner walls of the left and right sides of the housing (1). The guide rod passes through the slider (19) and is slidably connected. A spiral slide bar (31) is provided through the slider (19). Water is placed above the spiral slide bar (31). A connecting plate (32) is fixedly connected to the lower end of the flat part. The lower end of the connecting plate (32) is elastically connected to the upper end of the slider (19) through a second spring (34). The lower end of the spiral slide bar (31) is fixedly connected to the upper end of the connecting block (35). An electric telescopic rod (21) is fixedly connected to the inner top of the housing (1). A hollow strip (22) is fixedly connected to the telescopic end of the electric telescopic rod (21). Four trapezoidal plates (23) are fixedly connected to the lower end of the hollow strip (22). A guide wheel (33) is fixedly connected to the upper end of the spiral slide bar (31). It also includes an auxiliary processing module, which includes a toothed plate (17) fixedly connected to the inner wall of multiple tanks (15) near the water tank (9). The input shaft of the gearbox (38) passes through the lower horizontal part of the U-shaped plate (30) and is fixedly connected to a transmission gear (37). The transmission gear (37) cooperates with multiple toothed plates (17). Each rotating shaft (42) is fixedly connected to a second bevel gear (43) at one end away from the corresponding rectangular bar (39). The lower end of the connecting block (35) is fixedly connected to a hollow tube (36). The outer side of the hollow tube (36) is fixedly connected to a first bevel gear (40). The first bevel gear (40) meshes with multiple second bevel gears (43). During the movement, the module will pass through multiple oils at different temperatures to achieve slow heat exchange and cooling, thus achieving the purpose of tempering.

2. The heat treatment process for high-strength aerospace steel according to claim 1, characterized in that, The ring-shaped high-strength steel component is heated to a temperature of 860°C.

3. The heat treatment process for high-strength aerospace steel according to claim 1, characterized in that, The three sets of oil temperatures in the heat treatment device are 500℃, 250℃ and 30℃, respectively.

4. The heat treatment process for high-strength aerospace steel according to claim 1, characterized in that, It also includes three temperature control modules, each of which is used to ensure that the oil temperature in the corresponding tank (15) is uniform. The temperature control module includes a heating element (16) fixedly connected to the bottom of the tank (15). A temperature sensor (18) is installed on the inner side wall of the tank (15). A semiconductor refrigeration element (3) is installed on the side of the housing (1) away from the water tank (9). The cooling end of the semiconductor refrigeration element (3) extends into the tank (15).

5. The heat treatment process for high-strength aerospace steel according to claim 1, characterized in that, The threaded rod (20) extends to the outside at one end away from the drive motor (11) and is mounted on a rotating disk (46) via a one-way bearing. A second piston cylinder (6) is fixedly connected to the side of the housing (1) away from the drive motor (11). A second piston plate (44) that can slide up and down is provided inside the second piston cylinder (6). A connecting strip (45) is rotatably connected to the side of the rotating disk (46) away from the threaded rod (20). The other end of the connecting strip (45) is rotatably connected to the lower end of the second piston plate (44). A filter box (12) is fixedly connected to the side of the housing (1) away from the operating port (4). The inner top space of the second piston cylinder (6) and the side of the filter box (12) away from the drive motor (11) are connected to each other. The space is connected through the third one-way pipe (14). The space on the side of the filter box (12) away from the third one-way pipe (14) is connected to the hollow strip (22) through the air inlet pipe (13). The bottom of the hollow strip (22) is provided with multiple air inlets (28). The top space of the second piston cylinder (6) is connected to the inside of the water tank (9) through the second one-way pipe (10). The upper end of the shell (1) is fixedly connected to the first piston cylinder (5). The top space of the first piston cylinder (5) is connected to the outside through the guide port. The first piston cylinder (5) is provided with a first piston plate (24) that can slide up and down. The upper end of the first piston plate (24) is elastically connected to the top of the first piston cylinder (5) through the first spring (25).

6. The heat treatment process for high-strength steel in aerospace applications according to claim 5, characterized in that, The inner top space of the second piston cylinder (6) is connected to the inner bottom space of the first piston cylinder (5) through the first one-way pipe (7). A U-shaped hollow plate (26) is fixedly connected to the inner wall of the housing (1) away from the U-shaped induction coil (29). Multiple nozzles (27) are opened on the inner side wall of the U-shaped hollow plate (26). The inner bottom space of the first piston cylinder (5) is connected to the inside of the U-shaped hollow plate (26) through the discharge pipe (8). A normally open solenoid valve is installed inside the discharge pipe (8). The normally open solenoid valve is opened and closed synchronously with the drive motor (11).

7. The heat treatment process for high-strength aerospace steel according to claim 6, characterized in that, One-way valves are installed in the first one-way pipe (7), the second one-way pipe (10) and the third one-way pipe (14). The flow direction of the one-way valve inside the second one-way pipe (10) is one-way from the bottom of the water tank (9) into the top space inside the second piston cylinder (6). The flow direction of the one-way valve inside the third one-way pipe (14) is one-way from the filter box (12) into the top space inside the second piston cylinder (6). The flow direction of the one-way valve inside the first one-way pipe (7) is one-way from the top space inside the second piston cylinder (6) into the internal space of the first piston cylinder (5).

Images