Energy-saving and environment-friendly ultra-long high-capacity ion nitriding method and equipment thereof

Abstract

The invention discloses an energy-saving and environment-friendly ultra-long high-capacity ion nitriding method and equipment thereof, and develops energy-saving and environment-friendly ultra-long high-capacity ion nitriding equipment applied to a screw rod, nitriding treatment is carried out by utilizing ionized nitrogen-containing gas according to a glow discharge principle, the working environment is very clean, and special equipment for preventing public hazards is not needed. The nitriding speed is high and is only 1 / 3-1 / 5 of the nitriding time of common gas; the glow discharge is used for directly heating the workpiece, so that uniform temperature distribution can be obtained, and the energy consumption is only 40-70% of that of gas nitriding; ion nitriding can be carried out at the temperature of 380 DEG C, treatment is carried out at the low temperature, and the deformation amount of a treated workpiece is extremely small; the gas consumption is extremely low, and the treatment cost can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nitriding equipment, and in particular relates to an energy-saving and environmentally friendly ultra-long and large capacity ion nitriding method and equipment thereof. Background Art

[0002] The existing patent CN220503159U is a stainless steel anti-corrosion ion nitriding furnace. The user drives the bidirectional threaded rod to rotate through the rotation of the motor, thereby driving the two threaded sleeves and two sliding sleeves to move, thereby driving the four connecting rods to move, thereby driving the support plate to rise. When it rises to the position of the furnace mouth, the stainless steel parts are placed on the support plate, and then the motor is rotated in the opposite direction to drive the support plate to descend, and then the furnace cover is covered on the furnace body by the contraction of the two hydraulic rods, and the furnace body is kept sealed by the sealing ring, and the sealing ring is stuck in the inside of the groove to make the internal sealing of the furnace body better to avoid leakage, and then the inside of the furnace body is evacuated to a vacuum state by the vacuum pump, and then by adding The air pump adds an appropriate amount of nitrogen to the interior of the furnace body, and then applies an anode voltage to the furnace body and a cathode voltage to the stainless steel parts, thereby performing nitriding and anti-corrosion treatment on the internal stainless steel parts. The internal pressure conditions can be observed through the observation window and the pressure gauge, which is convenient for control. When the stainless steel workpiece is nitrided and needs to be taken out, the furnace cover is driven away from the furnace body by the extension of the hydraulic rod, and then the support plate is driven to rise to the position of the furnace mouth by the rotation of the motor, and the stainless steel parts can be taken out quickly and conveniently. At the same time, the through holes opened on the support plate can enable all surfaces of the stainless steel parts to be exposed to nitrogen, and the reaction is more uniform and rapid.

[0003] This patent has an electric lifting mechanism, but the electric lifting mechanism has a complex structure and poor lifting stability. In addition, the nitriding furnace cannot shorten the ion nitriding time during the nitriding operation, is not convenient for stirring the nitrogen evenly, and is not suitable for ultra-large capacity ion nitriding, resulting in poor nitriding effect.

[0004] At the same time, the commonly used gas nitriding heat treatment needs to be carried out at 560℃ using endothermic gas. It takes 3-90 hours depending on the workpiece material and the requirements of the carburized layer. The cycle is long, there is a brittle phase on the surface, and generally a finishing process is required (the machining allowance is very small, generally 1 to 2 threads). In addition, soot is easily generated in the furnace, which is explosive when mixed with air. In addition, it is also easy to produce trace amounts of toxic gases, and white ammonium carbonate compounds are produced in the mixing tube of ammonia and endothermic gas, which blocks the channel in the tube and other defects. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving and environmentally friendly ultra-long and large capacity ion nitriding method and equipment thereof to solve the problems raised in the above background technology.

[0006] The present invention provides the following technical solution: an energy-saving and environmentally friendly ultra-long capacity ion nitriding method, step one, pretreatment: the workpiece needs to be thoroughly cleaned before ion nitriding to remove oil stains, rust, etc., and polished or ground; Step 2: Loading the furnace: placing the pretreated workpiece into a vacuum container of an ion nitriding furnace, which has a cathode and an anode disposed therein; Step 3: Vacuuming: Start the vacuum pump to extract the air in the furnace, and the vacuum degree is between 10^-1 Pa and 10^0 Pa; Step 4, filling: a certain proportion of nitrogen and argon and other inert gases are filled into the furnace, with nitrogen accounting for 80%-100% and the rest being argon or other inert gases, and the gas pressure is 20-200 Pa, to form an atmosphere suitable for glow discharge; Step 5, glow discharge: Apply DC high voltage between the cathode and cathode to make the gas glow discharge. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge hit the surface of the workpiece at high speed, causing the surface temperature of the workpiece to increase. Step 6, heating and nitriding: During the glow discharge, the surface temperature of the workpiece gradually increases. The low-temperature nitriding temperature is between 400°C and 525°C, which takes 20 to 50 hours; the medium-temperature nitriding temperature is between 525°C and 600°C, which takes 10 to 30 hours; the high-temperature nitriding temperature is between 525°C and 600°C, which takes 5 to 20 hours. Nitrogen ions are absorbed by the surface of the workpiece at high temperature and penetrate into the surface of the workpiece to form a nitrided layer. Step 7, maintenance and monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitriding layer meet the requirements; Step 8, Cooling: After nitriding is completed, turn off the power supply and gas supply, and let the workpiece cool naturally or forcefully in the furnace to room temperature; Step 9, post-processing: The workpiece after nitriding needs to undergo stress relief or other post-processing procedures to improve its performance.

[0007] An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment comprises a bottom plate, a furnace body is fixedly connected to the upper surface of the bottom plate, two hydraulic rods are fixedly connected to the upper surface of the bottom plate, the two hydraulic rods are symmetrically distributed on both sides of the furnace body, the top ends of the two hydraulic rods are fixedly connected to a furnace cover, an air extraction pump is arranged on the lower surface of the furnace cover, an air outlet end of the air extraction pump is connected to an air outlet pipe, the air outlet pipe extends to the outside of the furnace cover, an air inlet end of the air extraction pump is connected to an air inlet pipe, an air filling pump is arranged on the upper surface of the furnace cover, an air outlet of the air filling pump is connected to an air filling pipe, the air filling pipe extends through and extends to the lower surface of the furnace cover, an air inlet of the air filling pump is connected to an air charging pipe, a pressure gauge is arranged on the outer wall of the furnace body, and an observation window is arranged on the furnace body on one side of the pressure gauge; the characteristics are: it also includes an electric lifting mechanism and a nitrogen stirring mechanism; The furnace body is provided with an inner cavity, a partition cavity is formed between the inner cavity and the furnace body, a support block supported on the partition cavity is arranged on the bottom surface of the inner cavity, and a bottom cavity is formed between the support blocks; The electric lifting mechanism is installed in the compartment, and the electric lifting mechanism includes a motor with a drive shaft, a threaded lifting rod and a lifting plate, the threaded lifting rod includes a first threaded lifting rod and a second threaded lifting rod, the motor is arranged on one side of the compartment and the drive shaft is coupled with the first threaded lifting rod, the first threaded lifting rod is connected to the second threaded lifting rod on the other side of the compartment by a belt passing through the bottom cavity connecting shaft through an installed pulley, and the lifting plate is respectively threadedly connected with the first threaded lifting rod and the second threaded lifting rod by threaded parts arranged at both ends; The nitrogen stirring mechanism is arranged on the furnace cover, and the nitrogen stirring mechanism comprises a stirring motor with an output shaft and a nitrogen stirring blade, the output shaft coupling of the stirring motor is equipped with a connecting shaft, and the nitrogen stirring blade is installed on the connecting shaft; The bottom plate is provided with a power cavity, in which a power module is installed, and the front of the power cavity is provided with a first knob and a second knob for electrically connecting to the motor and the stirring motor respectively, and the first knob and the second knob are electrically connected to the power module respectively, and a power interface electrically connected to the power module is also provided on the front of the power cavity and on the right side of the first knob and the second knob.

[0008] Preferably, the top surface of the compartment is sealed, and shaft tubes are respectively provided on the top surface on one side of the compartment and the top surface and bottom surface on the other side of the compartment.

[0009] Preferably, longitudinal movement openings are opened on both sides of the inner cavity.

[0010] Preferably, the top surface of the first threaded lifting rod and the top surface and bottom surface of the second threaded lifting rod are all provided with shaft portions equipped with ball bearings, which are respectively axially connected in shaft tubes.

[0011] Preferably, the lifting plate is arranged with multiple rows of air holes and the left and right sides of the lifting plate are connected through connecting columns passing through the longitudinal moving opening and the screw connection part.

[0012] Preferably, the nitrogen stirring blade comprises a sleeve sleeved on the connecting shaft and a stirring blade arranged on the outer wall of the sleeve.

[0013] Preferably, a convex edge is provided on the top surface of the compartment, a groove is provided along the furnace opening of the furnace cover, a sealing strip is embedded in the groove, and two sides of the groove are clamped on the convex edge and fixed.

[0014] The beneficial effects of the present invention are as follows: compared with conventional gas nitriding, the glow ion nitriding technology has multiple advantages, such as short nitriding cycle, small deformation of workpiece, energy saving and reduced ammonia consumption, etc. Therefore, this method has been rapidly developed and applied in many fields, especially when processing metal materials that require wear resistance, fatigue resistance, corrosion resistance and other characteristics.

[0015] The electric lifting mechanism is driven by a motor installed in the compartment to drive the first threaded lifting rod, and the belt connected by the pulley drives the second threaded lifting rod connected to the other side of the compartment, so that the threaded part of the threaded connection is lifted and lowered in the inner cavity through the lifting plate connected by the connecting column. The nitriding stirring mechanism installed on the furnace cover facilitates the electric driving of the nitrogen stirring blade to stir the nitrogen in the furnace body evenly, shortens the time of ultra-large capacity ion nitriding, and has a uniform nitriding effect. Through the first and second knobs set on the bottom plate, the electric lifting mechanism and the nitriding stirring mechanism are easy to operate, easy to control, energy-saving and environmentally friendly, and improve the efficiency of ultra-large capacity ion nitriding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the furnace structure; Figure 3 It is a schematic diagram of the structure of the electric lifting mechanism; Figure 4 Schematic diagram of the structure of the first threaded lifting rod; Figure 5 It is a schematic diagram of the lifting plate structure; Figure 6 This is a schematic diagram of the furnace cover structure; Figure 7 It is a schematic diagram of the structure of the nitrogen stirring mechanism; In the figure: bottom plate 1, power cavity 11, power module 12, first knob 13, second knob 14, power interface 15, hydraulic rod 16, furnace cover 2, vacuum pump 21, air outlet pipe 22, air inlet pipe 23, air pump 24, air filling pipe 25, charging pipe 26, observation window 27, pressure gauge 28, furnace body 3, inner cavity 31, partition cavity 32, convex edge 33, groove 34, bottom cavity 36, longitudinal movement port 37, electric lifting mechanism 4, motor 41, first threaded lifting rod 42, second threaded lifting rod 43, pulley 44, belt 45, shaft 46, shaft tube 47, lifting plate 49, air vent 50, connecting column 51, threaded portion 52, nitrogen stirring mechanism 6, stirring motor 61, connecting shaft 62, nitrogen stirring blade 63, sleeve 64, stirring blade 65. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The technical solution provided by the present invention is an energy-saving and environmentally friendly ultra-long capacity ion nitriding method. Step 1: pretreatment: the workpiece needs to be thoroughly cleaned before ion nitriding to remove oil stains, rust, etc., and polished or ground; Step 2: Loading the furnace: placing the pretreated workpiece into a vacuum container of an ion nitriding furnace, which has a cathode and an anode disposed therein; Step 3: Vacuuming: Start the vacuum pump to extract the air in the furnace, and the vacuum degree is between 10^-1 Pa and 10^0 Pa; Step 4, filling: a certain proportion of nitrogen and argon and other inert gases are filled into the furnace, with nitrogen accounting for 80%-100% and the rest being argon or other inert gases, and the gas pressure is 20-200 Pa, to form an atmosphere suitable for glow discharge; Step 5, glow discharge: Apply DC high voltage between the cathode and cathode to make the gas glow discharge. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge hit the surface of the workpiece at high speed, causing the surface temperature of the workpiece to increase. Step 6, heating and nitriding: During the glow discharge, the surface temperature of the workpiece gradually increases. The low-temperature nitriding temperature is between 400°C and 525°C, which takes 20 to 50 hours; the medium-temperature nitriding temperature is between 525°C and 600°C, which takes 10 to 30 hours; the high-temperature nitriding temperature is between 525°C and 600°C, which takes 5 to 20 hours. Nitrogen ions are absorbed by the surface of the workpiece at high temperature and penetrate into the surface of the workpiece to form a nitrided layer. Step 7, maintenance and monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitriding layer meet the requirements; Step 8, Cooling: After nitriding is completed, turn off the power supply and gas supply, and let the workpiece cool naturally or forcefully in the furnace to room temperature; Step 9, post-processing: The workpiece after nitriding needs to undergo stress relief or other post-processing procedures to improve its performance.

[0019] We have developed energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment for screws. The ionized nitrogen-containing gas is used for nitriding treatment based on the glow discharge principle. The working environment is very clean and no special equipment is required to prevent pollution. The nitriding speed is fast, only 1 / 3 to 1 / 5 of the time of ordinary gas nitriding. The workpiece is directly heated by glow discharge to obtain a uniform temperature distribution, and the energy consumption is only 40 to 70% of that of gas nitriding. Ion nitriding can be carried out from 380°C and the treatment is carried out at low temperature, so the deformation of the treated workpiece is extremely small. The gas consumption is extremely small (only 1 / 3-1 / 5 of that of gas nitriding), which can greatly reduce the processing cost.

[0020] See also Figure 1-7 The technical solution provided by the present invention is as follows: an energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment, comprising a bottom plate 1, a furnace body 3 is fixedly connected to the upper surface of the bottom plate 1, two hydraulic rods 16 are fixedly connected to the upper surface of the bottom plate 1, the two hydraulic rods 16 are symmetrically distributed on both sides of the furnace body 3, a furnace cover 2 is fixedly connected to the top of the two hydraulic rods 16, a vacuum pump 21 is arranged on the lower surface of the furnace cover 2, an outlet end of the vacuum pump 21 is connected to an outlet pipe 22, the outlet pipe 22 extends to the outside of the furnace cover 2, and an inlet end of the vacuum pump 21 is connected to an inlet pipe 22. The air pipe 23 is convenient for evacuating the interior of the furnace body 3 to a vacuum state, which is convenient for nitriding. The upper surface of the furnace cover 2 is provided with an air pump 24, and the air outlet of the air pump 24 is connected to a gas pipe 25, which extends through the lower surface of the furnace cover 2. The air inlet of the air pump 24 is connected to a charging pipe 26, which is convenient for adding nitrogen to the interior of the furnace body 3 and nitriding treatment. The outer wall of the furnace body 3 is provided with a pressure gauge 28, and the furnace body 3 is provided with an observation window 27 on one side of the pressure gauge 28, which is convenient for detecting the pressure inside the furnace body. This technical structure has been disclosed in existing patents, please refer to the existing patents.

[0021] Although the existing patent in the background technology has an electric lifting mechanism, the electric lifting mechanism has a complex structure and poor lifting stability. In addition, the nitriding furnace cannot shorten the ion nitriding time during the nitriding operation, is not convenient for stirring the nitrogen evenly, and is not suitable for ultra-long capacity ion nitriding, resulting in poor nitriding effect. This application improves the existing patent. While improving the lifting structure, it also improves the bottom plate and the internal structure of the furnace body, and adds a nitrogen stirring mechanism suitable for ultra-long capacity ion nitriding, shortens the nitriding time, and improves the nitriding efficiency after the nitrogen is evenly stirred.

[0022] Specifically, the present application also includes an electric lifting mechanism and a nitrogen stirring mechanism; In the improvement of the above two structures, the furnace structure in the present application is: the furnace body 3 is provided with an inner cavity 31, a partition 32 is formed between the inner cavity 31 and the furnace body 3, the bottom surface of the inner cavity 31 is provided with a support block supported on the partition 32, in this embodiment, two front and rear blocks are provided, and a bottom cavity 36 is formed between the support blocks; the top surface of the partition 32 is provided with a convex edge 33, the furnace cover 2 is provided with a groove 34 along the furnace mouth, a sealing strip (not shown in the figure) is embedded in the groove 34, and both sides of the groove 34 are clamped on the convex edge 33 and fixed. The furnace cover 2 is sealed on the furnace body 3, which increases the sealing effect.

[0023] The specific structure of the electric lifting mechanism in this embodiment is as follows: The electric lifting mechanism 4 is installed in the compartment 32. The electric lifting mechanism 4 includes a motor 41 with a drive shaft, a threaded lifting rod and a lifting plate 49. The threaded lifting rod includes a first threaded lifting rod 42 and a second threaded lifting rod 43 arranged opposite to each other. The motor 41 is arranged on one side of the compartment 32 and the drive shaft is coupled with the first threaded lifting rod 42. The motor model is not an innovation of this application and can be used flexibly. The first threaded lifting rod 42 is connected to the second threaded lifting rod 43 on the other side of the compartment 32 by a belt 45 through the bottom cavity 36 connecting shaft 62 through the fixed installation pulley 44 to connect the two threaded lifting rods. The lifting plate 49 is respectively screwed with the first and second threaded lifting rods 43 by threaded parts 52 arranged at both ends; the lifting plate 49 is arranged with multiple rows of air holes 50 and the left and right sides of the lifting plate 49 are connected through the longitudinal moving port 37 and the screw connection part 52 through the connecting column 51. The top surface of the compartment 32 is sealed and a shaft tube 47 is respectively provided on the top surface of one side of the compartment 32 and the top surface and bottom surface of the other side of the compartment 32. Used to axially connect the first and second threaded lifting rods 43 respectively. Longitudinal movement openings 37 are opened on both sides of the inner cavity 31. The connecting columns 51 arranged on both sides of the lifting plate 49 are respectively connected to the threaded portion 52 through the longitudinal movement openings 37, so as to facilitate the first and second threaded lifting rods 43 to screw and lift the screwed portion. The top surface of the first threaded lifting rod 42 and the top and bottom surfaces of the second threaded lifting rod 43 are provided with shaft portions 46 equipped with ball bearings, which are respectively axially connected in the shaft tube 47. It is convenient to rotate the shafts separately. In this embodiment, the thread direction of the first and second threaded lifting rods 43 is arranged in a spiral arrangement from left to right, so when rotating clockwise, the screwed portion is screwed and moved downward, and vice versa, it is screwed and moved upward, thereby realizing the lifting and lowering of the lifting plate 49.

[0024] In this embodiment, a nitrogen stirring mechanism is added as follows: The nitrogen stirring mechanism 6 is arranged on the furnace cover 2, and the nitrogen stirring mechanism 6 includes a stirring motor 61 with an output shaft and a nitrogen stirring blade 63. The stirring motor 61 has an output shaft coupling equipped with a connecting shaft 62, and the nitrogen stirring blade 63 is installed on the connecting shaft 62; the length of the connecting shaft 62 is set so as not to affect the rising setting of the lifting plate 49, because after the lifting plate 49 rises, the furnace cover 2 also needs to be opened. The nitrogen stirring blade 63 includes a sleeve 64 sleeved on the connecting shaft 62 and a stirring blade 65 arranged on the outer wall of the sleeve 64. This is suitable for ultra-long and large capacity ion nitriding, shortens the nitriding time, and improves the effect of uniform nitriding.

[0025] In the above, both the motor and the stirring motor 61 need to be electrically connected. Therefore, the base plate 1 is provided with a power cavity 11, and a power module 12 is installed in the power cavity 11. The power module 12 can be a lithium battery or a storage battery. The front of the power cavity 11 is provided with a first knob 13 and a second knob 14 for being electrically connected to the motor 4 and the stirring motor 61 respectively. The motor 4 passes through the power cavity 11 through a connecting line and is electrically connected to the first knob 13. The stirring motor 61 passes through the rear end of the power cavity 11 through a motor connecting line and is electrically connected to the second knob 14. The connecting lines are drawn in the figure. The first and second knobs 14 are electrically connected to the power module 12 respectively, and a power interface 15 electrically connected to the power module 12 is also provided on the front of the power cavity 11 and on the right side of the first and second knobs 14. The working principle is very simple and can be understood by general electrical knowledge. Rotating the first knob and / or the second knob can turn on the power to realize the operation of the operating motor and the stirring motor.

[0026] The working principle of the present application is as follows: during operation, the user rotates the first knob to drive the first threaded lifting rod to rotate through the motor, and the first threaded lifting rod uses a belt to pass through the bottom cavity through the installed pulley to connect to the second threaded lifting rod connected to the shaft, thereby screwing and driving the threaded part together, and the threaded part passes through the longitudinal moving opening in the inner cavity through the connecting column and is screwed to the first and second threaded lifting rods, driving the support plate to rise or fall.

[0027] When it rises to the position of the furnace mouth, the stainless steel parts are placed on the support plate, and then the motor rotates in the opposite direction to drive the support plate down. The furnace cover is covered on the furnace body by the contraction of the two hydraulic rods, and the furnace cover is sealed on the furnace body through the sealing ring, so that the grooves on both sides are stuck on the convex edge to increase the sealing and avoid leakage. Then, the interior of the furnace body is evacuated to a vacuum state through the vacuum pump, and the gas pump adds an appropriate amount of nitrogen to the interior of the furnace, applies an anode voltage to the furnace body, and applies a cathode voltage to the stainless steel parts, so as to perform nitriding and anti-corrosion treatment on the internal stainless steel parts, and in order to make the nitrogen evenly dispersed, an electric stirring mechanism is added to achieve uniform stirring of the nitrogen. The internal pressure condition can be observed through the observation window and the pressure gauge, which is convenient for control.

[0028] When the stainless steel workpiece is nitrided and needs to be taken out, the extension of the hydraulic rod drives the furnace cover to separate from the furnace body, and the motor lifts the first lifting threaded rod to drive the second lifting threaded rod to make the support plate rise to the position of the furnace mouth, so that the stainless steel part can be taken out quickly and conveniently. At the same time, the air holes on the support plate can allow all surfaces of the stainless steel parts to be exposed to nitrogen, which is more uniform and faster.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving and environmentally friendly ultra-long and large-capacity ion nitriding method, characterized in that: The steps include: Step 1, pretreatment: the workpiece needs to be thoroughly cleaned before ion nitriding to remove oil, rust, etc., and polished or ground; Step 2: Loading the furnace: placing the pretreated workpiece into a vacuum container of an ion nitriding furnace, which has a cathode and an anode disposed therein; Step 3: Vacuuming: Start the vacuum pump to extract the air in the furnace, and the vacuum degree is between 10^-1 Pa and 10^0 Pa; Step 4, filling: a certain proportion of nitrogen and argon and other inert gases are filled into the furnace, with nitrogen accounting for 80%-100% and the rest being argon or other inert gases, and the gas pressure is 20-200 Pa, to form an atmosphere suitable for glow discharge; Step 5, glow discharge: Apply DC high voltage between the cathode and cathode to make the gas glow discharge. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge hit the surface of the workpiece at high speed, causing the surface temperature of the workpiece to increase. Step 6, heating and nitriding: During the glow discharge, the surface temperature of the workpiece gradually increases. The low-temperature nitriding temperature is between 400°C and 525°C, which takes 20 to 50 hours; the medium-temperature nitriding temperature is between 525°C and 600°C, which takes 10 to 30 hours; the high-temperature nitriding temperature is between 525°C and 600°C, which takes 5 to 20 hours. Nitrogen ions are absorbed by the surface of the workpiece at high temperature and penetrate into the surface of the workpiece to form a nitrided layer. Step 7, maintenance and monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitriding layer meet the requirements; Step 8, Cooling: After nitriding is completed, turn off the power supply and gas supply, and let the workpiece cool naturally or forcefully in the furnace to room temperature; Step 9, post-processing: The workpiece after nitriding needs to undergo stress relief or other post-processing procedures to improve its performance.

2. An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment, comprising a bottom plate, a furnace body is fixedly connected to the upper surface of the bottom plate, two hydraulic rods are fixedly connected to the upper surface of the bottom plate, the two hydraulic rods are symmetrically distributed on both sides of the furnace body, the tops of the two hydraulic rods are fixedly connected to a furnace cover, an air extraction pump is arranged on the lower surface of the furnace cover, an air outlet of the air extraction pump is connected to an air outlet pipe, the air outlet pipe extends to the outside of the furnace cover, an air inlet end of the air extraction pump is connected to an air inlet pipe, an air filling pump is arranged on the upper surface of the furnace cover, an air outlet of the air filling pump is connected to an air filling pipe, the air filling pipe extends through and extends to the lower surface of the furnace cover, an air inlet of the air filling pump is connected to an air charging pipe, a pressure gauge is arranged on the outer wall of the furnace body, and an observation window is arranged on the furnace body on one side of the pressure gauge; characterized in that: It also includes an electric lifting mechanism and a nitrogen stirring mechanism; The furnace body is provided with an inner cavity, a partition cavity is formed between the inner cavity and the furnace body, a support block supported on the partition cavity is arranged on the bottom surface of the inner cavity, and a bottom cavity is formed between the support blocks; The electric lifting mechanism is installed in the compartment, and the electric lifting mechanism includes a motor with a drive shaft, a threaded lifting rod and a lifting plate, the threaded lifting rod includes a first threaded lifting rod and a second threaded lifting rod, the motor is arranged on one side of the compartment and the drive shaft is coupled with the first threaded lifting rod, the first threaded lifting rod is connected to the second threaded lifting rod on the other side of the compartment by a belt passing through the bottom cavity connecting shaft through an installed pulley, and the lifting plate is respectively threadedly connected with the first threaded lifting rod and the second threaded lifting rod by threaded parts arranged at both ends; The nitrogen stirring mechanism is arranged on the furnace cover, and the nitrogen stirring mechanism comprises a stirring motor with an output shaft and a nitrogen stirring blade, the output shaft coupling of the stirring motor is equipped with a connecting shaft, and the nitrogen stirring blade is installed on the connecting shaft; The bottom plate is provided with a power cavity, in which a power module is installed, and the front of the power cavity is provided with a first knob and a second knob for electrically connecting to the motor and the stirring motor respectively, and the first knob and the second knob are electrically connected to the power module respectively, and a power interface electrically connected to the power module is also provided on the front of the power cavity and on the right side of the first knob and the second knob.

3. An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment, characterized by: The top surface of the compartment is sealed, and shaft tubes are respectively provided on the top surface on one side of the compartment and the top surface and bottom surface on the other side of the compartment.

4. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 2 is characterized by: The inner cavity has longitudinal movement openings on both sides.

5. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 2 is characterized by: The top surface of the first threaded lifting rod and the top surface and bottom surface of the second threaded lifting rod are all provided with shaft portions equipped with ball bearings, which are respectively axially connected in shaft tubes.

6. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 2 is characterized by: The lifting plate is provided with multiple rows of air holes, and the left and right sides of the lifting plate are connected through connecting columns passing through the longitudinal moving opening and the screw connection part.

7. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 2 is characterized by: The nitrogen stirring blade comprises a sleeve sleeved on the connecting shaft and a stirring blade arranged on the outer wall of the sleeve.

8. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 2 is characterized by: The top surface of the compartment is provided with a convex edge, and the furnace cover is provided with a groove along the furnace opening. A sealing strip is embedded in the groove, and both sides of the groove are clamped and fixed on the convex edge.

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