Neodymium-iron-boron magnet production line and production process

Abstract

The application relates to the technical field of neodymium-iron-boron magnets, in particular to a neodymium-iron-boron magnet production line and a production process, wherein the production process comprises, in sequence, a vacuum strip casting furnace, a smelting furnace, a hydrogen crushing furnace, an air flow furnace, a stirring furnace, a sintering furnace, a cutting device, a polishing device, a surface dysprosium and terbium permeation device, a drying device and a magnetizing device; the neodymium-iron-boron magnet prepared by the application has the advantages of high magnetic energy, high coercive force and high magnetic saturation, and is not prone to collapse, so that the quality of the neodymium-iron-boron magnet is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of neodymium iron boron magnet technology, and more particularly to a neodymium iron boron magnet production line and manufacturing process. Background Technology

[0002] Neodymium magnets, also known as neodymium iron boron magnets, are tetragonal crystals formed from neodymium, iron, and boron. Neodymium iron boron magnets are widely used in electronic products, such as hard drives, mobile phones, headphones, and battery-powered tools.

[0003] However, existing NdFeB magnets have low magnetic energy efficiency and low coercivity; in addition, due to the many steps in the sintering process of NdFeB magnets, they are prone to chipping and breakage, which affects the production quality of NdFeB magnets. Summary of the Invention

[0004] The purpose of this invention is to provide a neodymium iron boron magnet production line and manufacturing process to address the shortcomings of existing technologies. The neodymium iron boron magnets produced by this invention have advantages such as high magnetic energy, high coercivity, and high magnetic saturation, and are not prone to chipping, thus effectively improving the quality of neodymium iron boron magnets.

[0005] This invention is achieved through the following technical solution: a neodymium iron boron magnet production line, comprising, in sequence according to the production process, a vacuum spinning furnace, a smelting furnace, a hydrogen crushing furnace, a gas flow furnace, a stirring furnace, a sintering furnace, a cutting device, a grinding device, a surface dysprosium-terbium infiltration device, a drying device, and a magnetizing device; a first feeding channel is provided between the vacuum spinning furnace and the smelting furnace, one end of the first feeding channel being connected to the outlet of the vacuum spinning furnace, and the other end of the first feeding channel being connected to the inlet of the smelting furnace; a second feeding channel is provided between the smelting furnace and the hydrogen crushing furnace, one end of the second feeding channel being connected to the outlet of the smelting furnace, and the other end of the second feeding channel being connected to the inlet of the hydrogen crushing furnace; the outlet of the hydrogen crushing furnace is connected to the gas flow furnace. The furnace includes a furnace body with a stirring rod inside. A feed inlet is located at the upper end of the furnace body, and a motor for driving the stirring rod to rotate is located at the lower end of the furnace body. A discharge outlet is located in the furnace body. The discharge outlet of the gas flow furnace is connected to the feed inlet of the furnace, and the discharge outlet of the furnace is connected to the feed inlet of the sintering furnace. A first gripping manipulator is located between the sintering furnace and the cutting device. A second gripping manipulator is located between the cutting device and the grinding device. A third gripping manipulator is located between the grinding device and the surface dysprosium-terbium infiltration device. A first conveyor belt is located between the surface dysprosium-terbium infiltration device and the drying device. A second conveyor belt is located between the drying device and the magnetizing device.

[0006] Preferably, the outer wall of the sintering furnace is provided with a cooling device, which includes a cooling box and a cold air fan inside the cooling box. A connecting groove is provided between the interior of the cooling box and the interior of the sintering furnace, and a baffle is provided in the connecting groove. A fulcrum and a lever are provided at the upper end of the cooling box. The upper end of the fulcrum is hinged to the middle of the lever. A metal wire is provided at the right end of the lever. One end of the metal wire is fixedly connected to the lever, and the other end of the metal wire is fixedly connected to the baffle. A slide rail and a linear motor are provided at the left end of the cooling box. The linear motor is slidably connected to the slide rail. The linear motor is provided with a pull rod. The lower end of the pull rod is connected to the linear motor, and the upper end of the pull rod is hinged to the left end of the lever. A support tray is provided below the discharge port of the sintering furnace. An inclined surface is provided at the left end of the support tray, and a material placement area is provided at the right end of the support tray.

[0007] Preferably, the cutting device includes a positioning mold, and a cutting mechanism is arranged directly above the positioning mold. The cutting mechanism includes a cutting blade, a first driving mechanism for driving the cutting blade to move along the X-axis, a second driving mechanism for driving the cutting blade to move along the Y-axis, and a third driving mechanism for driving the cutting blade to move up and down along the Z-axis.

[0008] Preferably, the polishing device includes a vibratory disc.

[0009] Preferably, the surface dysprosium-terbium diffusion device includes an electroplating tank, above which is a roller and a fourth driving mechanism for driving the roller to rotate; the roller is provided with a plurality of through holes.

[0010] Preferably, the surface dysprosium-terbium infiltration device includes a mold plate, a fifth drive mechanism for driving the mold plate to rotate 180 degrees, and a spray gun is arranged above the mold plate.

[0011] A process for manufacturing neodymium iron boron magnets includes the following steps:

[0012] Step A: Place the raw material ferroboron into a vacuum spinning furnace, melt it at high temperature in the vacuum spinning furnace, and then cool and solidify the melt into small sheet-like spinning sheets;

[0013] Step B: Place the strip and neodymium, praseodymium-neodymium, iron-boron, refined boron, copper, aluminum, gallium, terbium, cobalt, iron, dysprosium-iron, and niobium-iron into a melting furnace and melt them together. Then cool them to form alloy castings. The melting time is 4-5 hours and the temperature is 1200-1400 degrees Celsius.

[0014] Step C: The alloy casting is placed in a hydrogen crushing furnace for processing. The alloy casting is placed in a hydrogen environment. The hydrogen will enter the alloy along the neodymium-rich phase thin layer, causing it to expand, burst, and break. It cracks along the neodymium-rich phase layer to form coarse powder. The alloy casting is crushed in the hydrogen crushing furnace for 30 min to 55 min.

[0015] Step D: Then put the coarse powder into the airflow furnace. The high-speed airflow drives the coarse alloy powder to move at high speed, causing the coarse alloy powder to collide and wear against each other, forming fine powder.

[0016] Step E: Next, put the neodymium iron boron magnetic powder, axial orientation powder, micro powder, binder, and solvent into the mixing furnace and mix them evenly together;

[0017] Step F: Place the mixed powder into a mold, and then place the mold into a sintering furnace for sintering and shaping;

[0018] Step G: The formed neodymium iron boron magnets are cut into the required size using a cutting device;

[0019] Step H: The neodymium iron boron magnets are polished using a polishing device to improve their toughness;

[0020] Step I: Perform dysprosium-terbium diffusion on the surface of the neodymium iron boron magnets, followed by drying;

[0021] Step J: Magnetize the neodymium iron boron magnet.

[0022] Preferably, the surface dysprosium and terbium diffusion process in step I uses an electroplating process.

[0023] Preferably, the surface dysprosium-terbium diffusion process in step I uses a spraying process.

[0024] Preferably, the surface dysprosium-terbium diffusion process in step I uses a vacuum coating process.

[0025] The beneficial effects of this invention are as follows: Boron iron is placed in a vacuum spinning furnace and melted at high temperature. The molten metal is then cooled and solidified into small, sheet-like spinning sheets. These sheets, along with neodymium, praseodymium-neodymium, iron boron, refined boron, copper, aluminum, gallium, terbium, cobalt, iron, dysprosium iron, and niobium iron, are placed in a smelting furnace and melted together. The resulting alloy castings are then cooled to form alloy castings. The smelting time is 4 hours, and the temperature is 1300 degrees Celsius. The alloy castings are then processed in a hydrogen crushing furnace. In a hydrogen environment, hydrogen enters the alloy along the neodymium-rich phase layer, causing it to expand, burst, and break. Cracks form coarse powder along the neodymium-rich phase layer. The coarse powder is then placed in a gas flow furnace, where a high-speed airflow propels the alloy coarse powder to high speed, causing them to collide and wear against each other, forming fine powder. Finally, neodymium iron boron magnetic powder and axially fixed... Powder, micro powder, binder, and solvent are placed in a mixing furnace and mixed evenly to allow the NdFeB powder and other materials to fuse together. After sintering, a dense structure is formed, giving it advantages such as high magnetic energy, high coercivity, and high magnetic saturation. The mixed powder is placed into a mold, which is then placed in a sintering furnace for sintering. The formed NdFeB magnets are cut to the required size using a cutting device. The NdFeB magnets are then polished using a grinding device to improve their toughness and prevent chipping from impacts. The surface of the NdFeB magnets is then infiltrated with dysprosium and terbium, followed by drying. Finally, the NdFeB magnets are magnetized. The NdFeB magnets produced by this invention have advantages such as high magnetic energy, high coercivity, and high magnetic saturation, and are not prone to chipping, effectively improving the quality of NdFeB magnets. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the neodymium iron boron magnet production line of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the stirring furnace of the present invention.

[0028] Figure 3 This is a schematic diagram of the sintering furnace of the present invention.

[0029] Figure 4 This is a schematic diagram of the cutting device of the present invention.

[0030] Figure 5 This is a schematic diagram of one embodiment of the surface dysprosium-terbium infiltration device of the present invention. Figure 6 This is a schematic diagram of another embodiment of the surface dysprosium-terbium infiltration device of the present invention. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 The present invention will be further described in detail below, along with specific embodiments.

[0032] like Figures 1 to 2As shown, a neodymium iron boron magnet production line, according to the production process, sequentially includes a vacuum spinning furnace 1, a smelting furnace 2, a hydrogen crushing furnace 3, a gas flow furnace 4, a stirring furnace 5, a sintering furnace 6, a cutting device 7, a grinding device 8, a surface dysprosium-terbium infiltration device 9, a drying device 10, and a magnetizing device 11. A first feeding channel 12 is provided between the vacuum spinning furnace 1 and the smelting furnace 2. One end of the first feeding channel 12 is connected to the outlet of the vacuum spinning furnace 1, and the other end is connected to the inlet of the smelting furnace 2. A second feeding channel 13 is provided between the smelting furnace 2 and the hydrogen crushing furnace 3. One end of the second feeding channel 13 is connected to the outlet of the smelting furnace 2, and the other end is connected to the inlet of the hydrogen crushing furnace 3. The outlet of the hydrogen crushing furnace 3 is connected to the inlet of the gas flow furnace 4. The stirring furnace 5 includes... The furnace body 51 contains a stirring rod 52. A feed inlet 53 is located at the upper end of the furnace body 51, and a motor 54 for driving the stirring rod 52 is located at the lower end of the furnace body 51. A discharge outlet 55 is located within the furnace body 51. The discharge outlet of the gas flow furnace 4 is connected to the feed inlet 53 of the stirring furnace 5, and the discharge outlet 55 of the stirring furnace 5 is connected to the feed inlet of the sintering furnace 6. A first gripping manipulator 14 is located between the sintering furnace 6 and the cutting device 7. A second gripping manipulator 15 is located between the cutting device 7 and the grinding device 8. A third gripping manipulator 16 is located between the grinding device 8 and the surface dysprosium-terbium infiltration device 9. A first conveyor belt 17 is located between the surface dysprosium-terbium infiltration device 9 and the drying device 10. A second conveyor belt 18 is located between the drying device 10 and the magnetizing device 11.

[0033] In this embodiment, the raw material ferroboron is placed in a vacuum spinning furnace 1 and melted at high temperature. The molten metal is then cooled and solidified into small, sheet-like spinning strips. These strips are fed into a melting furnace 2 through a first feeding channel 12. Neodymium, praseodymium-neodymium, ferroboron, refined boron, copper, aluminum, gallium, terbium, cobalt, iron, dysprosium-iron, and niobium-iron are then added to the melting furnace 2. These materials are melted together with the spinning strips and subsequently cooled to form alloy castings. The melting time is 4 hours and the temperature is 1300 degrees Celsius. The alloy castings are then fed into a hydrogen crushing furnace 3 through a second feeding channel 13 for further processing. The alloy castings are placed in a hydrogen ring. Under these conditions, hydrogen gas enters the alloy along the neodymium-rich phase layer, causing it to expand, burst, and break apart, cracking along the neodymium-rich phase layer to form coarse powder. This coarse powder is then placed in a gas flow furnace 4, where a high-speed airflow propels it to high speed, causing collisions and abrasion between the powder particles, forming fine powder. Next, neodymium iron boron magnetic powder, axially oriented powder, micro powder, binder, and solvent are placed in a mixing furnace 5. A motor 54 drives a stirring rod 52 to rotate, mixing the neodymium iron boron magnetic powder, axially oriented powder, micro powder, binder, and solvent together to ensure uniform mixing and abrasion between the neodymium iron boron powder and other materials. The mixture is fused together and then sintered to form a dense structure, giving it advantages such as high magnetic energy, high coercivity, and high magnetic saturation. The mixed powder is placed into a mold, which is then placed in a sintering furnace 6 for sintering. The formed NdFeB magnet is then gripped by a first gripping robot 14 and moved to a cutting device 7, where it is cut to the required size. After cutting, a second gripping robot 15 moves the NdFeB magnet to a grinding device 8, where it is ground to improve its toughness and prevent chipping from collisions. Subsequently... The neodymium iron boron magnet is then transported to the surface dysprosium and terbium infiltration device 9 via the third gripping robot 16. The surface dysprosium and terbium infiltration device 9 performs the surface dysprosium and terbium infiltration process on the neodymium iron boron magnet. After the dysprosium and terbium infiltration process is completed, the neodymium iron boron magnet enters the drying device 10 via the first conveyor belt 17 for high-temperature drying. Finally, it enters the magnetizing device 11 via the second conveyor belt 18 for magnetization, completing the entire production process of the neodymium iron boron magnet. The neodymium iron boron magnet produced by this invention has the advantages of high magnetic energy, high coercivity, and high magnetic saturation, and is not prone to chipping, effectively improving the quality of neodymium iron boron magnets.

[0034] The first gripping robotic arm device 14, the second gripping robotic arm device 15, and the third gripping robotic arm device 16 of the present invention all use suction cup gripping.

[0035] Neodymium iron boron magnets require rapid cooling after sintering before being removed from the furnace, such as... Figure 3As shown, the outer wall of the sintering furnace 6 is equipped with a cooling device, which includes a cooling box 61. A cold air fan 62 is installed inside the cooling box 61. A connecting groove 63 is provided between the interior of the cooling box 61 and the interior of the sintering furnace 6. A baffle 64 is installed within the connecting groove 63. A fulcrum 65 and a lever 66 are provided at the upper end of the cooling box 61. The upper end of the fulcrum 65 is hinged to the middle of the lever 66. A metal wire 67 is provided at the right end of the lever 66. One end of the metal wire 67 is fixedly connected to the lever 66, and the other end is fixedly connected to the baffle 64. A slide rail 68 and a linear motor 69 are provided at the left end of the cooling box 61. The linear motor 69 is slidably connected to the slide rail 68. The linear motor 69 is equipped with a pull rod 691. The lower end of the pull rod 691... The upper end of the pull rod 691 is hinged to the left end of the lever 66, connected to the linear motor 69. A support tray 19 is provided below the discharge port of the sintering furnace 6. The left end of the support tray 19 is provided with an inclined surface 191, and the right end of the support tray 19 is provided with a material placement area 192. After the NdFeB magnets are sintered, they move downward along the slide rail 68 via the linear motor 69. The pull rod 691 pulls down the left end of the lever 66, and the right end of the lever 66 is pulled up. The baffle 64 disengages from the connecting groove 63, and the cooling box 61 communicates with the interior of the sintering furnace 6. The cold air blower 62 blows cold air into the sintering furnace 6 to achieve rapid cooling. After cooling is completed, the discharge port of the sintering furnace 6 opens, and the NdFeB magnets fall onto the support tray 19. They slide down the inclined surface 191 into the material placement area 192, making it convenient for the first gripping manipulator 14 to grip them.

[0036] like Figure 4 As shown, in this embodiment, the cutting device 7 includes a positioning mold 71, and a cutting mechanism is arranged directly above the positioning mold 71. The cutting mechanism includes a cutting blade 72, a first driving mechanism 73 for driving the cutting blade 72 to move along the X-axis, a second driving mechanism 74 for driving the cutting blade 72 to move along the Y-axis, and a third driving mechanism 75 for driving the cutting blade 72 to move up and down along the Z-axis. According to the customer's required dimensions, the cutting blade 72 performs cutting. The first driving mechanism 73, the second driving mechanism 74, and the third driving mechanism 75 are used to drive the cutting blade 72 to perform precise positioning and accurate cutting. In this invention, the first driving mechanism 73, the second driving mechanism 74, and the third driving mechanism 75 are all linear transmission mechanisms.

[0037] In this embodiment, the polishing device 8 includes a vibrating disc. Polishing materials and neodymium iron boron magnets are placed into the vibrating disc together, and water is added. The vibration of the vibrating disc causes the polishing materials and neodymium iron boron magnets to collide and wear against each other, making the surface of the neodymium iron boron magnets smooth and tough.

[0038] Example 1.

[0039] As one embodiment of the surface dysprosium-terbium infiltration device 9 of the present invention, this embodiment employs an electroplating process, such as... Figure 5 As shown, in this embodiment, the surface dysprosium and terbium infiltration device 9 includes an electroplating tank 91. A roller 92 and a fourth driving mechanism 93 for driving the roller 92 to rotate are arranged above the electroplating tank 91. The roller 92 is provided with a plurality of through holes 94. The electroplating tank 91 contains a dysprosium and terbium infiltration solution. Neodymium iron boron magnets are placed into the roller 92, and then the roller 92 is immersed in the electroplating tank 91. The dysprosium and terbium infiltration solution coats the surface of the neodymium iron boron magnets.

[0040] Example 2.

[0041] In another embodiment of the surface dysprosium-terbium infiltration device 9 of the present invention, this embodiment employs a spraying process, such as... Figure 6 As shown, in this embodiment, the surface dysprosium-terbium infiltration device 9 includes a mold plate 95 and a fifth drive mechanism 96 for driving the mold plate 95 to rotate 180 degrees. A spray gun 97 is arranged above the mold plate 95. Neodymium iron boron magnets are placed inside the mold plate 95. The spray gun 97 sprays the dysprosium-terbium infiltration solution onto the surface of the neodymium iron boron magnets. The fifth drive mechanism 96 drives the mold plate to rotate 180 degrees, so that the spray gun 97 sprays the other side of the neodymium iron boron magnets.

[0042] A process for producing neodymium iron boron magnets, characterized by the following steps:

[0043] Step A: Place the raw material ferroboron into a vacuum spinning furnace, melt it at high temperature in vacuum spinning furnace 1, and then cool and solidify the melt into small sheet-shaped spinning sheets;

[0044] Step B: Place the strip and neodymium, praseodymium-neodymium, iron-boron, refined boron, copper, aluminum, gallium, terbium, cobalt, iron, dysprosium-iron, and niobium-iron into smelting furnace 2 and smelt them together. Then cool them to form alloy castings. The smelting time is 4-5 hours and the temperature is 1200-1400 degrees Celsius.

[0045] Step C: The alloy casting is placed in the hydrogen crushing furnace 3 for processing. The alloy casting is placed in a hydrogen environment. The hydrogen will enter the alloy along the neodymium-rich phase thin layer, causing it to expand, burst, and break. It cracks along the neodymium-rich phase layer, forming coarse powder.

[0046] Step D: Then put the coarse powder into the airflow furnace 4. The high-speed airflow drives the alloy coarse powder to move at high speed, causing the alloy coarse powder to collide and wear against each other to form fine powder.

[0047] Step E: Then put the neodymium iron boron magnetic powder, axial orientation powder, micro powder, binder, and solvent into the mixing furnace 5 and mix them evenly together;

[0048] Step F: Place the mixed powder into a mold, and then place the mold into the sintering furnace 6 for sintering and shaping;

[0049] Step G: The formed neodymium iron boron magnets are cut into the required size by the cutting device 7;

[0050] Step H: The neodymium iron boron magnets are polished using polishing device 8 to improve their toughness;

[0051] Step I: Perform dysprosium-terbium diffusion on the surface of the neodymium iron boron magnets, followed by drying;

[0052] Step J: Magnetize the neodymium iron boron magnet.

[0053] As one embodiment of the process of the present invention, the surface dysprosium and terbium diffusion process in step I adopts an electroplating process.

[0054] As another embodiment of the process of the present invention, the surface dysprosium and terbium diffusion process in step I adopts a spraying process.

[0055] As another embodiment of the process of the present invention, the surface dysprosium and terbium diffusion process in step I adopts a vacuum coating process.

[0056] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A neodymium iron boron magnet production line, characterized in that: The production process includes, in sequence, a vacuum belt spinning furnace, a melting furnace, a hydrogen crushing furnace, a gas flow furnace, a stirring furnace, a sintering furnace, a cutting device, a grinding device, a surface dysprosium and terbium infiltration device, a drying device, and a magnetizing device. A first feeding channel is provided between the vacuum belt spinning furnace and the melting furnace. One end of the first feeding channel is connected to the outlet of the vacuum belt spinning furnace, and the other end is connected to the inlet of the melting furnace. A second feeding channel is provided between the melting furnace and the hydrogen crushing furnace. One end of the second feeding channel is connected to the outlet of the melting furnace, and the other end is connected to the inlet of the hydrogen crushing furnace. The outlet of the hydrogen crushing furnace is connected to the inlet of the gas flow furnace. The stirring furnace includes... The furnace body includes a stirring rod, a feed inlet at the upper end, a motor for driving the stirring rod at the lower end, and a discharge outlet. The discharge outlet of the gas flow furnace is connected to the feed inlet of the stirring furnace, and the discharge outlet of the stirring furnace is connected to the feed inlet of the sintering furnace. A first gripping robot is installed between the sintering furnace and the cutting device, a second gripping robot is installed between the cutting device and the grinding device, and a third gripping robot is installed between the grinding device and the surface dysprosium and terbium infiltration device. A first conveyor belt is installed between the surface dysprosium and terbium infiltration device and the drying device, and a second conveyor belt is installed between the drying device and the magnetizing device. The outer wall of the sintering furnace is equipped with a cooling device, which includes a cooling box containing a cold air fan. A connecting groove is provided between the interior of the cooling box and the interior of the sintering furnace, and a baffle is installed within the connecting groove. A fulcrum and lever are provided at the upper end of the cooling box. The upper end of the fulcrum is hinged to the middle of the lever. A metal wire is provided at the right end of the lever, with one end fixedly connected to the lever and the other end fixedly connected to the baffle. A slide rail and a linear motor are provided at the left end of the cooling box. The linear motor is slidably connected to the slide rail and has a pull rod. The lower end of the pull rod is connected to the linear motor, and the upper end of the pull rod is hinged to the left end of the lever. A support tray is provided below the discharge port of the sintering furnace. An inclined surface is provided at the left end of the support tray, and a material placement area is provided at the right end of the support tray.

2. The neodymium iron boron magnet production line according to claim 1, characterized in that: The cutting device includes a positioning mold, and a cutting mechanism is arranged directly above the positioning mold. The cutting mechanism includes a cutting blade, a first driving mechanism for driving the cutting blade to move along the X-axis, a second driving mechanism for driving the cutting blade to move along the Y-axis, and a third driving mechanism for driving the cutting blade to move up and down along the Z-axis.

3. The neodymium iron boron magnet production line according to claim 1, characterized in that: The grinding device includes a vibratory plate.

4. The neodymium iron boron magnet production line according to claim 1, characterized in that: The surface dysprosium and terbium diffusion device includes an electroplating tank, above which is a roller and a fourth driving mechanism for driving the roller to rotate; the roller is provided with several through holes.

5. A neodymium iron boron magnet production line according to claim 1, characterized in that: The surface dysprosium and terbium infiltration device includes a mold plate and a fifth drive mechanism for driving the mold plate to rotate 180 degrees. A spray gun is arranged above the mold plate.

6. A manufacturing process for neodymium iron boron magnets, characterized in that: The process includes a neodymium iron boron magnet production line as described in claim 1 and the following steps: Step A: Place the raw material ferroboron into a vacuum spinning furnace, melt it at high temperature in the vacuum spinning furnace, and then cool and solidify the melt into small sheet-like spinning sheets; Step B: Place the strip and neodymium, praseodymium-neodymium, iron-boron, refined boron, copper, aluminum, gallium, terbium, cobalt, iron, dysprosium-iron, and niobium-iron into a melting furnace and melt them together. Then cool them to form alloy castings. The melting time is 4-5 hours and the temperature is 1200-1400 degrees Celsius. Step C: The alloy casting is placed in a hydrogen crushing furnace for processing. The alloy casting is placed in a hydrogen environment. The hydrogen will enter the alloy along the neodymium-rich phase thin layer, causing it to expand, burst, and break. It cracks along the neodymium-rich phase layer to form coarse powder. The alloy casting is crushed in the hydrogen crushing furnace for 30 min to 55 min. Step D: Then put the coarse powder into the airflow furnace. The high-speed airflow drives the coarse alloy powder to move at high speed, causing the coarse alloy powder to collide and wear against each other, forming fine powder. Step E: Then put the neodymium iron boron magnetic powder, axial orientation powder, micro powder, binder, and solvent into the mixing furnace and mix them evenly together; Step F: Place the mixed powder into a mold, and then place the mold into a sintering furnace for sintering and shaping; Step G: The formed neodymium iron boron magnets are cut into the required size using a cutting device; Step H: The neodymium iron boron magnets are polished using a polishing device to improve their toughness; Step I: Perform dysprosium-terbium diffusion on the surface of the neodymium iron boron magnets, followed by drying; Step J: Magnetize the neodymium iron boron magnet.

7. The neodymium iron boron magnet manufacturing process according to claim 6, characterized in that: The surface dysprosium and terbium diffusion process in step I is an electroplating process.

8. The neodymium iron boron magnet manufacturing process according to claim 6, characterized in that: The surface dysprosium and terbium diffusion process in step I uses a spraying process.

9. The manufacturing process for neodymium iron boron magnets according to claim 6, characterized in that: The surface dysprosium and terbium diffusion process in step I uses a vacuum coating process.

Images