Tempering and subzero treatment integrated furnace based on gas protection and use method of tempering and subzero treatment integrated furnace

Abstract

The invention relates to the technical field of heat treatment equipment, and discloses a tempering and subzero treatment integrated furnace based on gas protection and a using method thereof.The tempering and subzero treatment integrated furnace comprises a furnace body, a cooling pipeline, a built-in plate, a storage plate, an atmosphere protection mechanism and a control system. The furnace body is of a double-layer structure, a spiral cooling pipeline and a heating wire are arranged in the furnace body, a heat preservation layer is arranged on the outer wall, and gas protection is achieved inside through an atmosphere pipe and a nozzle. The deep cooling and tempering processes can be integrated in the same furnace body to be completed through the integrated design, the workpiece transfer frequency is reduced, the oxidation phenomenon is avoided, the energy utilization efficiency is improved through structure optimization and heat preservation design, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment equipment, and in particular to a gas-protected tempering and cryogenic treatment integrated furnace and a method for using the same. Background Art

[0002] In the field of modern industrial manufacturing, tempering and cryogenic treatment are important process means to improve the performance of metal workpieces. The tempering process releases the internal stress of the workpiece by heating, thereby improving its toughness and stability; while cryogenic treatment changes the microstructure of the material through a low-temperature environment, further optimizing its hardness and wear resistance. However, traditional tempering and cryogenic treatment usually need to be carried out separately in different equipment, which not only increases the number of transfers between processes, but may also lead to a decrease in the surface quality of the workpiece and a decrease in process efficiency. In addition, during the high-temperature tempering process, the workpiece is prone to oxidation due to contact with air, affecting the final product quality. Therefore, how to achieve the integrated operation of tempering and cryogenic treatment in a single device and effectively avoid workpiece oxidation has become a technical problem that needs to be solved urgently.

[0003] To address these challenges, there is an urgent need to develop a highly efficient device that integrates tempering and cryogenic treatment, while also providing stable gas protection, precise environmental parameter control, and optimized energy efficiency. This invention addresses this need by proposing a gas-protected, integrated tempering and cryogenic treatment furnace. Through innovative structural design and integrated functionality, this device addresses many of the shortcomings of conventional equipment, significantly improving process efficiency and product quality. Summary of the Invention

[0004] This invention addresses the existing issues of frequent workpiece transfers between cryogenic and tempering processes, the susceptibility to oxidation, and low energy efficiency. By providing a gas-shielded, integrated furnace for tempering and cryogenic treatment and its use, the invention addresses the existing issues of frequent workpiece transfers between cryogenic and tempering processes, the susceptibility to oxidation, and low energy efficiency. Through its integrated design and optimized structure, the furnace achieves efficient and stable cryogenic and tempering treatments while providing a reliable gas-shielded environment.

[0005] The present invention provides an integrated furnace for tempering and deep-cold treatment based on gas protection, comprising a furnace body and supporting legs fixed at the four corners of the bottom of the furnace body. The furnace body adopts a double-layer structure, which is divided into an inner layer and an outer layer, and a cavity is formed between the inner layer and the outer layer, wherein a cooling pipe is spirally arranged inside the cavity to achieve rapid cooling inside the furnace body. One end of the cooling pipe is connected to the refrigerant input pipe, and the other end is connected to the heat medium output pipe, and the refrigerant input pipe and the heat medium output pipe both pass through the furnace body and extend to the outside. The outer wall surface of the furnace body is provided with an insulation layer, which adopts a multi-layer composite structure, the outer layer of which is a high-temperature resistant ceramic fiber material, and the inner layer is a vacuum insulation board to improve the thermal insulation performance and reduce energy consumption. Furthermore, the rear end of the furnace body is a closed structure, and the front end is connected to a sealing cover by a hinge, and a handle is provided at the front end of the sealing cover to facilitate opening and closing operations.

[0006] Furthermore, the furnace body is symmetrically positioned with built-in plates on either side. Both plates feature a hollow cavity design, housing multiple sets of heating wires for heating the furnace. Crossbeams are secured at the four corners between the two plates, and the top and bottom are connected to the furnace's inner walls via L-shaped connecting strips to ensure structural stability. A storage plate, evenly spaced with through-holes, is secured in the middle between the two plates for placing workpieces.

[0007] In particular, the interior of the furnace body is provided with an atmosphere protection mechanism for atmosphere protection of the workpiece, specifically comprising: two atmosphere pipes, respectively fixed between the upper and lower beams, the surface of the atmosphere pipes being penetrated and fixed with nozzles of different orientations and evenly distributed, for evenly spraying protective gas above and below the storage plate. A branch pipe is penetrated and fixed on one side of each atmosphere pipe, one end of the branch pipe penetrates the furnace body and extends to the outside, and the end is connected to a transition joint. A filter screen made of stainless steel with a pore size of 50 microns is fixed inside the transition joint to filter impurities in the protective gas. The two transition joints are connected by an interconnecting pipe, and an atmosphere external pipe is penetrated and fixed at the center of one side of the interconnecting pipe. A flow meter is installed on the top left side of the atmosphere external pipe for real-time monitoring of the gas flow; a regulating valve is installed on the top right side for adjusting the gas flow according to preset requirements.

[0008] Furthermore, a pressure sensor is installed on the top left side of the furnace body, and a temperature sensor is installed on the top right side. The detection ends of the pressure sensor and temperature sensor extend into the interior of the furnace body, used to monitor the pressure and temperature inside the furnace in real time. A pressure relief valve is installed and penetrated through the bottom right side of the furnace body, and a gas discharge valve is installed and penetrated through the bottom left side of the furnace body, used to regulate the pressure inside the furnace. A control panel is installed on one side of the furnace body. The bottom of the control panel is connected to the outer wall of the furnace body via an L-shaped support rod, used to control the operation of the entire system.

[0009] A method for using a gas-protected tempering and cryogenic treatment integrated furnace comprises the following steps: S1 Cryogenic process: The workpiece to be processed is placed on the placement plate, and the cooling system is started. The refrigerant enters the cooling pipe through the refrigerant inlet pipe, rapidly cooling the internal space of the furnace until it reaches the temperature range required for the cryogenic process.

[0010] S2 Gas Shielding: Before or during the cryogenic process, the control system initiates a command to introduce high-pressure nitrogen into the furnace through an external atmosphere pipe. This high-pressure nitrogen is then diverted through interconnecting pipes to upper and lower transition joints. After being filtered through a filter, it enters the atmosphere pipe through branch pipes and is evenly sprayed through nozzles above and below the storage plate, creating a protective environment above atmospheric pressure and isolating air from entering the furnace. A flow meter monitors the gas flow in real time and transmits this data to the control system, which adjusts the opening of the regulating valve according to preset requirements to maintain a stable gas pressure within the furnace.

[0011] S3 Tempering: The heating wires are activated to heat the interior of the furnace, while a pressure sensor monitors the gas pressure in real time. If the pressure exceeds a set threshold, the pressure relief valve opens, and excess gas is discharged through the gas discharge valve.

[0012] S4 Processing after the end of the process: After the tempering process is completed, turn off the heating element and gas protection system, open the sealing cover, and take out the workpiece.

[0013] The present invention achieves the following beneficial effects through the above technical solution: First, by setting up a gas protection system, high-pressure nitrogen is injected into the furnace after the cryogenic process is completed, forming a protective environment above atmospheric pressure, effectively isolating air from entering the furnace and preventing the workpiece from oxidizing during the high-temperature tempering process. Secondly, the pressure regulating mechanism monitors and adjusts the gas pressure in the furnace in real time to ensure a stable environment inside the furnace and avoid affecting the process effect due to excessively high or low pressure. Thirdly, through an integrated design, the cryogenic and tempering processes are integrated into the same furnace, reducing the number of times the workpiece is transferred between processes, thereby reducing the risk of deterioration in the surface quality of the workpiece. Finally, by optimizing the furnace structure and the insulation layer design, energy efficiency is improved and operating costs are reduced.

[0014] In particular, the spiral arrangement of the cooling ducts in this invention allows the refrigerant to evenly cover the cavity between the inner and outer layers of the furnace body, ensuring rapid cooling of the furnace interior. Furthermore, the cavity design of the built-in plate not only provides installation space for the heating wire but also enhances the structural strength of the built-in plate, maintaining its stability in high-temperature environments. Furthermore, the nozzles in the atmosphere protection mechanism are designed with different orientations, ensuring that the protective gas evenly covers the workpieces on the storage plate, thereby improving the protection effect.

[0015] In summary, the present invention provides an efficient, stable and energy-saving tempering and cryogenic treatment integrated furnace, which is suitable for cryogenic and tempering treatment of various workpieces and has significant technical advantages and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention from another perspective; Figure 3 Schematic diagram of the internal structure of the furnace body of the present invention; Figure 4 It is a schematic diagram of the cross-sectional three-dimensional structure of the furnace body of the present invention; Figure 5 This is a schematic structural diagram of the built-in plate and atmosphere tube of the present invention; Figure 6 Schematic diagram of the cross-sectional structure of the furnace cavity of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the built-in plate of the present invention.

[0017] Among them, 1. furnace body; 2. cooling pipe; 21. refrigerant input pipe; 22. heat medium output pipe; 3. built-in plate; 31. L-shaped connecting strip; 32. crossbeam; 33. heating wire; 4. storage plate; 5. atmosphere pipe; 51. nozzle; 52. branch pipe; 53. transition joint; 54. interconnecting pipe; 55. atmosphere external pipe; 56. flow meter; 57. regulating valve; 6. pressure sensor; 7. temperature sensor; 8. L-shaped support rod; 9. control panel; 10. pressure relief valve; 11. gas discharge valve; 12. support leg; 13. sealing cover; 131. handle. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The present invention provides a gas-protected tempering and cryogenic treatment integrated furnace and its use method, combined with Figures 1 to 7 The specific embodiments of the present invention are described in detail. Figure 1As shown, the overall structure of the present invention includes a furnace body 1 and support legs 12 fixed at the four corners of the bottom of the furnace body 1. The furnace body 1 adopts a double-layer structure design, forming a cavity between its inner and outer layers. A cooling pipe 2 is spirally arranged inside the cavity. One end of the cooling pipe 2 is connected to the refrigerant input pipe 21, and the other end is connected to the heat medium output pipe 22. Both ends penetrate the furnace body 1 and extend to the outside. This design ensures that the refrigerant can evenly cover the cavity between the inner and outer layers of the furnace body 1, thereby achieving rapid cooling of the interior space of the furnace body 1. The design of the refrigerant input pipe 21 and the heat medium output pipe 22 ensures a reasonable distribution of the refrigerant flow path, significantly improving cooling efficiency.

[0020] Built-in plates 3 are symmetrically arranged on the left and right sides of the interior of the furnace body 1. Both built-in plates 3 adopt a cavity design, and multiple groups of heating wires 33 are installed inside them to realize the heating function inside the furnace body 1. The cavity design of the built-in plate 3 not only provides installation space for the heating wires 33, but also enhances the structural strength of the built-in plate 3, so that it maintains stability in a high temperature environment. Crossbeams 32 are fixed at the four corners between the two built-in plates 3, and the top and bottom are connected to the inner wall of the furnace body 1 through L-shaped connecting strips 31. This connection method ensures the stability of the built-in plate 3 inside the furnace body 1. A storage plate 4 is fixed in the middle between the two built-in plates 3. The surface of the storage plate 4 is provided with evenly distributed through holes for placing the workpiece to be processed. The design of the through holes facilitates gas circulation, ensuring that the protective gas in the atmosphere protection mechanism can evenly cover the surface of the workpiece.

[0021] The furnace body 1 houses an atmosphere protection mechanism for workpiece protection. This mechanism comprises two atmosphere pipes 5, fixed between the upper and lower crossbeams 32, respectively. Uniformly distributed nozzles 51, arranged in different orientations, are inserted through and fixed to the surface of the atmosphere pipes 5, spraying shielding gas uniformly above and below the storage plate 4. A branch pipe 52 is inserted and fixed to one side of each atmosphere pipe 5. One end of the branch pipe 52 extends through the furnace body 1 and outward, where it terminates at a transition joint 53. A stainless steel filter with a pore size of 50 microns is fixed inside the transition joint 53 to filter impurities from the shielding gas. The two transition joints 53 are connected by an interconnecting pipe 54, which has an external atmosphere pipe 55 inserted and fixed at its center. A flowmeter 56 is mounted on the left side of the top of the external atmosphere pipe 55 for real-time gas flow monitoring, and a regulating valve 57 is mounted on the right side for adjusting the gas flow according to preset requirements. This design ensures that shielding gas enters the furnace body 1 at a stable flow rate and evenly covers the workpiece surface through the nozzles 51, preventing oxidation during the high-temperature tempering process.

[0022] like Figure 6As shown, the cooling pipe 2 is spirally arranged in the cavity between the inner and outer layers of the furnace body 1. This arrangement allows the refrigerant to evenly cover the entire cavity area, ensuring rapid cooling of the interior space of the furnace body 1. The design of the refrigerant inlet pipe 21 and the heat medium outlet pipe 22 allows the refrigerant to flow efficiently in the cooling pipe 2, thereby improving cooling efficiency. In addition, the outer wall of the furnace body 1 is provided with an insulation layer. This insulation layer adopts a multi-layer composite structure with an outer layer of high-temperature resistant ceramic fiber material and an inner layer of vacuum insulation board. This insulation layer design effectively reduces heat loss, improves energy utilization efficiency, and reduces operating costs.

[0023] like Figure 5 As shown, the structural design of the built-in plate 3 and the storage plate 4 fully considers the actual application requirements. The cavity design of the built-in plate 3 not only facilitates the installation of the heating wire 33, but also enhances the structural strength of the built-in plate 3, allowing it to maintain stability in high-temperature environments. The through-hole design on the surface of the storage plate 4 facilitates gas circulation, ensuring that the protective gas in the atmosphere protection mechanism can evenly cover the surface of the workpiece. In addition, the middle position of the storage plate 4 is fixed between the two built-in plates 3 to ensure its stability inside the furnace body 1 and avoid displacement due to high temperature or airflow impact.

[0024] A pressure sensor 6 is installed on the left side of the top of the furnace body 1, and a temperature sensor 7 is installed on the right side of the top. The detection ends of the pressure sensor 6 and the temperature sensor 7 extend into the interior of the furnace body 1 for real-time monitoring of the pressure and temperature in the furnace. A pressure relief valve 10 is passed through and installed on the right side of the furnace body 1 near the bottom, and a gas discharge valve 11 is passed through and installed on the left side near the bottom for regulating the pressure in the furnace. A control panel 9 is provided on one side of the furnace body 1. The bottom of the control panel 9 is connected to the outer wall of the furnace body 1 through an L-shaped support rod 8 for controlling the operation of the entire system. The control panel 9 adjusts the operating status of the cooling system, heating system and gas protection system in real time by receiving signals from the pressure sensor 6 and the temperature sensor 7 to ensure the stability of the internal environment of the furnace body 1.

[0025] The rear end of the furnace body 1 is closed, and the front end is hingedly connected to a sealing cover 13. A handle 131 is provided at the front end of the sealing cover 13 for easy opening and closing. The design of the sealing cover 13 ensures that the furnace body 1 maintains a good seal during operation, preventing outside air from entering the interior of the furnace body 1. Support legs 12 are fixed at the four corners of the bottom of the furnace body 1 to ensure that the furnace body 1 remains stable during operation.

[0026] The operating principle of the present invention is as follows: S1 Cryogenic Process: The workpiece to be processed is placed on the storage plate 4, and the cooling system is activated. Refrigerant enters the cooling pipe 2 through the refrigerant inlet pipe 21, rapidly cooling the interior of the furnace body 1 until it reaches the temperature range required for the cryogenic process. The spiral arrangement of the cooling pipe 2 ensures that the refrigerant evenly covers the cavity between the inner and outer layers of the furnace body 1, thereby achieving rapid cooling of the interior of the furnace body 1. S2 Gas Protection: Before or during the cryogenic process, the control system issues a command to connect high-pressure nitrogen and introduce it into the furnace body 1 through the external atmosphere pipe 55. The high-pressure nitrogen is diverted through the interconnecting pipe 54 to the upper and lower transition joints 53. After being filtered through the filter, it enters the atmosphere pipe 5 through the branch pipe 52 and is finally evenly sprayed above and below the storage plate 4 through the nozzle 51, creating a protective environment above atmospheric pressure and preventing air from entering the furnace body 1. A flow meter 56 monitors the gas flow in real time and transmits the data to the control system, which adjusts the opening of the regulating valve 57 according to preset requirements to maintain a stable gas pressure within the furnace. S3: Tempering Process: Activate heating element 33 to heat the interior of furnace body 1. Simultaneously, pressure sensor 6 monitors the gas pressure within the furnace in real time. If the pressure exceeds a set threshold, pressure relief valve 10 opens, and excess gas is discharged through gas discharge valve 11. S4: Post-Process Treatment: After the tempering process is complete, turn off the heating element and gas protection system, open the sealing cover 13, and remove the workpiece.

[0027] The present invention achieves the following technical effects through the above-mentioned technical solution: First, by setting up a gas protection system, high-pressure nitrogen is injected into the furnace body 1 after the cryogenic process is completed, forming a protective environment higher than the atmospheric pressure, effectively isolating the air from entering the interior of the furnace body 1, and avoiding oxidation of the workpiece during the high-temperature tempering process. Secondly, the gas pressure in the furnace body 1 is monitored and adjusted in real time by the pressure regulating mechanism to ensure the stability of the furnace environment and avoid affecting the process effect due to excessively high or low pressure. Thirdly, the cryogenic and tempering processes are integrated into the same furnace body 1 through an integrated design, which reduces the number of times the workpiece is transferred between processes, thereby reducing the risk of deterioration in the surface quality of the workpiece. Finally, by optimizing the structure of the furnace body 1 and the design of the thermal insulation layer, energy utilization efficiency is improved and operating costs are reduced.

[0028] In particular, the spiral arrangement of the cooling duct 2 in the present invention allows the refrigerant to evenly cover the cavity between the inner and outer layers of the furnace body 1, ensuring rapid cooling of the interior of the furnace body 1. Furthermore, the cavity design of the inner plate 3 not only provides installation space for the heating wire 33 but also enhances the structural strength of the inner plate 3, maintaining its stability in high-temperature environments. Furthermore, the nozzles 51 in the atmosphere protection mechanism are designed with different orientations, ensuring that the protective gas evenly covers the workpiece on the storage plate 4, thereby improving the protection effect.

[0029] In summary, the present invention provides an efficient, stable and energy-saving tempering and cryogenic treatment integrated furnace, which is suitable for cryogenic and tempering treatment of various workpieces and has significant technical advantages and application value.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gas-protected tempering and cryogenic treatment integrated furnace, comprising a furnace body (1) and supporting legs (12) fixed at the four corners of the bottom of the furnace body (1), characterized in that: The furnace body (1) adopts a double-layer structure, which is divided into an inner layer and an outer layer, and a cavity is formed between the inner layer and the outer layer. A cooling pipe (2) is spirally arranged inside the cavity. A refrigerant input pipe (21) is arranged at one end of the cooling pipe (2), and a heat medium output pipe (22) is arranged at the other end. The ends of the refrigerant input pipe (21) and the heat medium output pipe (22) both pass through the furnace body (1) and extend to the outside thereof. Built-in plates (3) are symmetrically arranged on the left and right sides of the interior of the furnace body (1), and the two built-in plates (3) are both designed as hollow cavities, with multiple groups of heating wires (33) installed therein. Crossbeams (32) are fixed at the four corners between the two built-in plates (3), and the tops and bottoms of the two built-in plates (3) are connected to the inner wall surface of the furnace body (1) through L-shaped connecting strips (31). A storage plate (4) is fixed in the middle between the two built-in plates (3), and the surface of the storage plate (4) is provided with evenly distributed through holes. An atmosphere protection mechanism for workpieces is provided inside the furnace body (1).

2. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: The outer wall surface of the furnace body (1) is provided with a heat-insulating layer, and the heat-insulating layer adopts a multi-layer composite structure, wherein the outer layer is a high-temperature resistant ceramic fiber material and the inner layer is a vacuum insulation board.

3. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: The rear end of the furnace body (1) adopts a closed structure, the front end of the furnace body (1) is connected to a sealing cover (13) via a hinge, and a handle (131) is fixed to the front end of the sealing cover (13).

4. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: The atmosphere protection mechanism includes two atmosphere tubes (5), one of which is fixed between the two upper cross beams (32), and the other is fixed between the two lower cross beams (32). The surfaces of the two atmosphere tubes (5) are penetrated and fixed with nozzles (51) with different orientations and uniform distribution. One side of the two atmosphere tubes (5) is penetrated and fixed with a branch pipe (52), and one end of the branch pipe (52) penetrates the furnace body (1) and extends to the outside thereof. One end of the two branch pipes (52) is fixed with a transition joint (53), and the inside of the two transition joints (53) is fixed with a filter screen, and the filter screen is made of stainless steel with a pore size of 50 microns.

5. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 4, characterized in that: The two transition joints (53) are connected via an interconnecting pipe (54), an atmosphere external pipe (55) is passed through and fixed at the center of one side of the interconnecting pipe (54), a flow meter (56) is passed through and installed at the left side of the top of the atmosphere external pipe (55), and a regulating valve (57) is passed through and installed at the right side of the top of the atmosphere external pipe (55).

6. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: A pressure relief valve (10) is passed through and installed at the bottom of the right side of the furnace body (1), and a gas discharge valve (11) is passed through and installed at the bottom of the left side of the furnace body (1).

7. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: A pressure sensor (6) is installed on the left side of the top of the furnace body (1), and a temperature sensor (7) is installed on the right side of the top of the furnace body (1). The detection ends of the pressure sensor (6) and the temperature sensor (7) extend into the interior of the furnace body (1) for detecting the pressure and temperature in the furnace.

8. The integrated tempering and cryogenic treatment furnace based on gas protection according to claim 1, characterized in that: A control panel (9) is provided on one side of the furnace body (1), and the bottom of the control panel (9) is connected to the outer wall surface of the furnace body (1) via an L-shaped support rod (8).

9. A method for using a gas-protected tempering and cryogenic treatment integrated furnace, characterized in that: The following steps are involved: In the S1 cryogenic process, the workpiece to be processed is placed on the placement plate (4), and the cooling system is started. The refrigerant enters the cooling pipe (2) through the refrigerant inlet pipe (21), and the internal space of the furnace body (1) is rapidly cooled until the temperature reaches the temperature range required by the cryogenic process. The spiral arrangement of the cooling pipe (2) ensures that the refrigerant can evenly cover the cavity between the inner layer and the outer layer of the furnace body (1), thereby achieving rapid cooling of the internal space of the furnace body (1); Before or during the cryogenic process, the S2 gas protection is instructed by the control panel (9) to connect high-pressure nitrogen and introduce it into the furnace body (1) through the atmosphere external pipe (55). The high-pressure nitrogen is diverted to the transition joints (53) on the upper and lower sides through the interconnecting pipe (54), filtered through the filter, and enters the atmosphere pipe (5) through the branch pipe (52). Finally, it is evenly sprayed to the top and bottom of the storage plate (4) through the nozzle (51), forming a protective environment higher than the atmospheric pressure, isolating the air from entering the furnace body (1). The flow meter (56) monitors the gas flow in real time and transmits the data to the control system. The control system adjusts the opening of the regulating valve (57) according to the preset requirements to maintain the gas pressure in the furnace stable. In the S3 tempering process, the heating wire (33) is started to heat the internal space of the furnace body (1), and at the same time, the pressure sensor (6) monitors the gas pressure in the furnace in real time. If the pressure exceeds the set threshold, the pressure relief valve (10) opens and the excess gas is discharged through the gas discharge valve (11); Treatment after the S4 process is completed After the tempering process is completed, the heating element and the gas protection system are turned off, the sealing cover (13) is opened, and the workpiece is taken out.

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