A method for manufacturing sintered NdFeB permanent magnet material

Abstract

The invention belongs to the technical field of rare earth permanent magnet materials, and specifically is a method for manufacturing sintered NdFeB permanent magnet materials. A conveyor belt, a hopper, a motor, a rotating rod, a spiral blade, a ball-end elastic rod and an elastic claw are arranged. NdFeB alloy flakes are poured into the interior of the hopper, and the motor drives the spiral blades on both sides to rotate. At the same time, the rotating rod drives the ball-end elastic rod to rotate, and drives the elastic claws to scrape the NdFeB alloy flakes, so that the adhered NdFeB alloy flakes are separated. The spiral blades push the NdFeB alloy flakes to move to the middle of the hopper and fall down. The NdFeB alloy flakes fall onto the center line of the conveyor belt, and the conveyor belt transports the NdFeB alloy flakes to the charging port of a hydrogen crushing furnace, thereby reducing the probability of the NdFeB alloy flakes falling when being transported on the conveyor belt, facilitating the operation of staff, reducing the workload of staff, and improving the safety of staff feeding.

Description

Technical Field

[0001] The invention belongs to the technical field of rare earth permanent magnet materials, in particular to a method for manufacturing sintered NdFeB permanent magnet materials. Background Art

[0002] The main components of sintered NdFeB permanent magnet materials are rare earth elements neodymium, iron and boron. Due to their excellent magnetic properties and good performance-price ratio, they are widely used in microwave communications, audio and video, instrumentation, electrical engineering, computers, magnetic separation, magnetic therapy and other fields. When preparing sintered NdFeB permanent magnet materials, the NdFeB alloy castings need to be crushed by hydrogen crushing process. By utilizing the hydrogen absorption characteristics of rare earth metal intermetallic compounds, the NdFeB alloy is placed in a hydrogen environment. Hydrogen enters the alloy along the neodymium-rich phase layer, causing it to expand, burst and break, and crack along the neodymium-rich phase layer, thereby turning the thin slices into coarse powder for subsequent processing.

[0003] A Chinese patent with publication number CN103624263B discloses a hydrogen crushing furnace, comprising a furnace door (4) installed at the front end of a furnace body (8), a pneumatic control system (21) and a vacuum generating system (22) connected to the furnace body (8) through gas pipelines; a heating chamber (7) is provided in the furnace body (8), a reaction barrel (15) is provided in the heating chamber (7), and a water cooling fan (13) is provided at the rear end of the furnace body (8); gas filter plates (18) are provided at both ends of the reaction barrel (15), a ventilation hole (5) is provided at the front end of the heating chamber (7), and a circular hole is provided at the rear end; a rotating system for driving the reaction barrel to rotate is installed outside the furnace door (4). The purpose of the invention is to provide a device for crushing rare earth alloys with better vacuum effect, higher safety, faster hydrogen crushing efficiency, and smaller and more uniform hydrogen crushing powder particle size. The device of the invention adopts a fully automated operating procedure, and at a standard operating temperature, enables rare earth alloys, especially neodymium iron boron alloys, to achieve a continuous process of fully absorbing hydrogen and expanding and completely dehydrogenating and decomposing in a closed environment.

[0004] When NdFeB castings are subjected to hydrogen crushing process, they are added into hydrogen crushing furnace for hydrogen crushing treatment. When NdFeB castings are added into hydrogen crushing furnace, workers need to use crane to lift the barrel containing NdFeB castings to the top of hydrogen crushing furnace for adding. In order to facilitate dumping of NdFeB castings, workers tie the lifting belt of crane to the middle of barrel for lifting. In the lifting process, the barrel may overturn if not handled with care, causing danger. At the same time, each hydrogen crushing process requires workers to operate the bracket of hydrogen crushing furnace several times, which greatly increases the workload of workers.

[0005] To this end, the present invention provides a method for manufacturing a sintered NdFeB permanent magnet material. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for manufacturing a sintered NdFeB permanent magnet material according to the present invention comprises the following steps:

[0008] A1: Smelting cerium, neodymium, cobalt, boron, copper, aluminum and iron to obtain NdFeB alloy castings;

[0009] A2: Put the NdFeB alloy casting into a hydrogen crushing furnace, crush it by hydrogen crushing process, and then grind it to obtain alloy powder;

[0010] A3: Add the alloy powder into the molding die and press it into shape;

[0011] A4: Grind and cut the surface of the formed NdFeB alloy body;

[0012] A5: The shaped NdFeB alloy body is sintered at 1000°C for 10 hours under vacuum conditions, and then tempered to 900°C for 3 hours and cooled to obtain a sintered NdFeB permanent magnet semi-finished product;

[0013] A6: Apply a mixed slurry of dysprosium, terbium, copper and aluminum to the surface of the sintered NdFeB permanent magnet semi-finished product, treat it at 800℃ for 8 to 12 hours, then cool it to 500℃ and keep it for 6 to 12 hours, and finally cool it to room temperature to obtain the sintered NdFeB permanent magnet finished product.

[0014] Preferably, the hydrogen crushing process described in A2 comprises the following steps:

[0015] B1: Pour the NdFeB alloy flakes into the hopper, start the motor to drive the spiral blades on both sides to rotate, push the NdFeB alloy flakes to move to the middle of the hopper and fall down. The NdFeB alloy flakes fall onto the center line of the conveyor belt, and the conveyor belt transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace;

[0016] B2: Heat the hydrogen crushing furnace to 100 to 150°C, introduce carbon monoxide gas, and stop introducing carbon monoxide gas after 1 to 3 hours;

[0017] B3: Evacuate the hydrogen crushing furnace, fill it with argon, replace the carbon monoxide gas in the hydrogen crushing furnace, and then evacuate it;

[0018] B4: Turn off the vacuum pump and fill the hydrogen crushing furnace with hydrogen to make the NdFeB alloy castings react with the hydrogen, causing the NdFeB alloy castings to expand and break.

[0019] Preferably, a hopper is fixedly connected to the top of the bottom end of the conveyor belt in B1, a motor is fixedly connected to one side of the hopper, a rotating rod is rotatably installed inside the hopper, one end of the rotating rod is fixedly connected to the rotating shaft of the motor, and spiral blades are fixedly connected to the outer rings of both ends of the rotating rod, and the spiral directions of the spiral blades on both sides are opposite; when working, the NdFeB alloy flakes are poured into the interior of the hopper, the motor drives the rotating rod to rotate, and drives the spiral blades on both sides to rotate, pushing the NdFeB alloy flakes to move to the middle of the hopper and fall down, and the NdFeB alloy flakes fall onto the center line of the conveyor belt, and the conveyor belt transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace, which reduces the probability of the NdFeB alloy flakes falling when being transported on the conveyor belt, is convenient for the staff to operate, reduces the workload of the staff, and improves the safety of the staff loading.

[0020] Preferably, the outer ring of the rotating rod is spirally fixed with a plurality of ball head elastic rods, and the outer wall of the ball head of the ball head elastic rod is fixed with a plurality of elastic claws; the ball head elastic rod in this embodiment is an elastic rod with a marble fixed at one end; the middle part of the elastic claw in this embodiment is the elastic rod, and the outer ring of the elastic rod is fixed with a plurality of arc-shaped claws; during operation, when the spiral blade pushes the NdFeB alloy casting to move, the rotating rod drives the ball head elastic rod to rotate, and drives the elastic claws to scrape the NdFeB alloy casting, separating the adhered NdFeB alloy castings, thereby improving the separation rate between the NdFeB alloy castings, thereby improving the efficiency of the reaction between the NdFeB alloy castings and hydrogen.

[0021] Preferably, a shell is fixedly connected to the middle top surface of the conveyor belt, and a plurality of dust hoods are slidably installed inside the shell. A collecting box is arranged at the bottom of the conveyor belt, and a vacuum pump is arranged on the side of the collecting box. The air inlet end of the vacuum pump is connected to the collecting box, and the top of the dust hood is connected to the top of the collecting box through a pipe. During operation, the rotating rod drives the ball head elastic rod to rotate, so that the ball head of the ball head elastic rod hits the NdFeB alloy casting sheet, so that the NdFeB alloy casting sheet vibrates, and the dust adhered to the surface of the NdFeB alloy casting sheet is shaken off to the top surface of the conveyor belt. When passing through the shell, the vacuum pump is started to extract the air inside the collecting box, so that negative pressure is generated inside the collecting box, so that the dust hood generates suction, and the dust on the top surface of the conveyor belt and the surface of the NdFeB alloy casting sheet is sucked up, and the dust is sucked into the collecting box, thereby completing the cleaning of the NdFeB alloy casting sheet, thereby improving the preparation quality of the sintered NdFeB permanent magnet material.

[0022] Preferably, a No. 1 screw is rotatably installed on the top surface of the dust hood, the No. 1 screw penetrates the top wall of the shell, and the No. 1 screw cooperates with the shell thread, a convex guide rail is fixedly connected to one side of the dust hood, and a concave guide rail is fixedly connected to the other side of the dust hood, and the convex guide rail and the concave guide rail are slidably cooperated; grooves and protrusions are provided on both sides of the convex surface of the convex guide rail and on both sides of the concave surface of the concave guide rail in this embodiment, and the grooves and the protrusions are slidably cooperated, thereby reducing the probability of the convex guide rail and the concave guide rail being separated; when working, the No. 1 screw is rotated to push the dust hood to slide inside the shell, drive the convex guide rail and the concave guide rail to slide relative to each other, and control the distance between the dust hood and the top surface of the conveyor belt, so as to facilitate the staff to adjust the suction force of the dust on the top surface of the conveyor belt and the surface of the NdFeB alloy casting.

[0023] Preferably, a cross bar is fixedly connected to the middle part of the bottom side of the dust hood, and elastic plates are fixedly connected to both sides of the bottom of the dust hood, and the sides of the elastic plates on both sides are close to each other and slide in cooperation with both sides of the top surface of the cross bar; when working, the suction force generated by the vacuum pump causes the outside air to enter the dust hood to generate wind, so that the elastic plate bends toward the inside of the dust hood, exposing the bottom of the dust hood; when the vacuum pump is turned off, the elastic plate is reset, so that the elastic plate cooperates with the cross bar to seal the dust hood, thereby reducing the dust inside the dust hood from falling back onto the top surface of the conveyor belt, thereby further improving the cleanliness of the conveyor belt.

[0024] Preferably, a crescent-shaped protrusion is rotatably installed on one side of the shell close to the bottom of the conveyor belt, and the bottom of the crescent-shaped protrusion is slidably matched with the top surface of the conveyor belt, and a torsion spring is provided on the outer ring of the rotating shaft of the crescent-shaped protrusion, and a slot is opened in the middle part of the bottom surface of the crescent-shaped protrusion, and a plurality of elastic bars are fixedly connected to the top surface of the slot, and a collision ball is fixedly connected to the lower end of the elastic bar; the cross-section of the crescent-shaped protrusion in this embodiment is crescent-shaped, and both ends are arc-shaped; during operation, when the NdFeB alloy casting is brought to the shell by the conveyor belt, the collision ball hits the NdFeB alloy casting, causing the elastic bar to bend, and when the elastic force generated by the bending of the elastic bar is greater than the resistance of the collision ball, the elastic bar is reset, so that the collision ball hits the NdFeB alloy casting, causing the NdFeB alloy casting to vibrate violently, thereby further improving the efficiency of dust removal from the surface of the NdFeB alloy casting.

[0025] Preferably, a mesh frame is provided on one side of the collecting box close to the vacuum pump, the interior of the mesh frame is filled with a plurality of sponge balls, a support plate is slidably mounted on the bottom of the collecting box, and a plurality of long hairs are fixedly connected to the top surface of the support plate; both sides of the mesh frame in this embodiment are composed of mesh plates; during operation, dust on the top surface of the conveyor belt and the surface of the NdFeB alloy casting sheet is sucked into the collecting box and blocked by the mesh frame and the sponge balls, and when the vacuum pump is turned off, the dust falls onto the top surface of the support plate and is blocked by the long hairs, thereby reducing the probability of dust flying inside the collecting box and facilitating the cleaning work of the staff.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The method for manufacturing sintered NdFeB permanent magnet material of the present invention comprises the following steps: a conveyor belt, a hopper, a motor, a rotating rod, a spiral blade, a ball-end elastic rod and an elastic claw are arranged; NdFeB alloy flakes are poured into the hopper, and the motor drives the spiral blades on both sides to rotate. Meanwhile, the rotating rod drives the ball-end elastic rod to rotate, and drives the elastic claws to scrape the NdFeB alloy flakes to separate the adhered NdFeB alloy flakes. The spiral blades push the NdFeB alloy flakes to move to the middle of the hopper and fall down. The NdFeB alloy flakes fall onto the center line of the conveyor belt, and the conveyor belt transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace, thereby reducing the probability of the NdFeB alloy flakes falling when being transported on the conveyor belt, facilitating the operation of the staff, reducing the workload of the staff and improving the safety of the staff in feeding the materials.

[0028] 2. The method for manufacturing sintered NdFeB permanent magnet material described in the present invention comprises the following steps: providing a shell, a dust hood, a collection box and a vacuum pump; a rotating rod drives the ball head elastic rod to rotate, so that the ball head of the ball head elastic rod hits the NdFeB alloy casting sheet, causing the NdFeB alloy casting sheet to vibrate, and the dust adhered to the surface of the NdFeB alloy casting sheet is shaken off to the top surface of the conveyor belt; when passing through the shell, the vacuum pump extracts the air inside the collection box, so that the dust hood generates suction, and the dust on the top surface of the conveyor belt and the surface of the NdFeB alloy casting sheet is sucked up, and the dust is sucked into the collection box, thereby completing the cleaning of the NdFeB alloy casting sheet, thereby improving the preparation quality of the sintered NdFeB permanent magnet material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0031] Figure 2 is a front view of the first embodiment of the present invention;

[0032] Figure 3 yes Figure 2 Cross-section at AA;

[0033] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0034] Figure 5 yes Figure 2 A partial enlarged view of point C in the middle;

[0035] Figure 6 yes Figure 5 Cross-section at DD;

[0036] Figure 7 yes Figure 2 A partial enlarged view of point E in the middle;

[0037] Figure 8 It is a partial structural diagram of the crescent-shaped convex rod of the second embodiment of the present invention;

[0038] Fig. 9 is a flow chart of the manufacturing method of the present invention;

[0039] Fig.10 This is a flow chart of the hydrogen crushing process of the present invention;

[0040] In the figure: 1. conveyor belt; 2. hopper; 3. motor; 4. rotating rod; 5. spiral blade; 6. ball-head elastic rod; 7. elastic claw; 8. shell; 9. dust hood; 10. collection box; 11. vacuum pump; 12. No. 1 screw; 13. convex guide rail; 14. concave guide rail; 15. cross bar; 16. elastic plate; 17. crescent-shaped convex rod; 18. notch; 19. elastic bar; 20. collision bead; 21. mesh frame; 22. sponge ball; 23. support plate; 24. long hair; 25. slide groove; 26. No. 2 screw; 27. stopper. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0042] Embodiment 1

[0043] like Fig. 9 As shown, a method for manufacturing a sintered NdFeB permanent magnet material according to an embodiment of the present invention includes the following steps:

[0044] A1: Smelting cerium, neodymium, cobalt, boron, copper, aluminum and iron to obtain NdFeB alloy castings;

[0045] A2: Put the NdFeB alloy casting into a hydrogen crushing furnace, crush it by hydrogen crushing process, and then grind it to obtain alloy powder;

[0046] A3: Add the alloy powder into the molding die and press it into shape;

[0047] A4: Grind and cut the surface of the formed NdFeB alloy body;

[0048] A5: The shaped NdFeB alloy body is sintered at 1000°C for 10 hours under vacuum conditions, and then tempered to 900°C for 3 hours and cooled to obtain a sintered NdFeB permanent magnet semi-finished product;

[0049] A6: Apply a mixed slurry of dysprosium, terbium, copper and aluminum to the surface of the sintered NdFeB permanent magnet semi-finished product, treat it at 800℃ for 8 to 12 hours, then cool it to 500℃ and keep it for 6 to 12 hours, and finally cool it to room temperature to obtain the sintered NdFeB permanent magnet finished product.

[0050] like Fig.10 As shown, the hydrogen crushing process described in A2 includes the following steps:

[0051] B1: pour the NdFeB alloy flakes into the hopper 2, start the motor 3 to drive the spiral blades 5 on both sides to rotate, push the NdFeB alloy flakes to move to the middle of the hopper 2 and fall down, and the NdFeB alloy flakes fall onto the center line of the conveyor belt 1, and the conveyor belt 1 transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace;

[0052] B2: Heat the hydrogen crushing furnace to 100 to 150°C, introduce carbon monoxide gas, and stop introducing carbon monoxide gas after 1 to 3 hours;

[0053] B3: Evacuate the hydrogen crushing furnace, fill it with argon, replace the carbon monoxide gas in the hydrogen crushing furnace, and then evacuate it;

[0054] B4: Turn off the vacuum pump and fill the hydrogen crushing furnace with hydrogen to make the NdFeB alloy castings react with the hydrogen, causing the NdFeB alloy castings to expand and break.

[0055] like Figures 1 to 3 As shown, a hopper 2 is fixedly connected to the top of the bottom end of the conveyor belt 1 in B1, a motor 3 is fixedly connected to one side of the hopper 2, a rotating rod 4 is rotatably installed inside the hopper 2, one end of the rotating rod 4 is fixedly connected to the rotating shaft of the motor 3, and spiral blades 5 are fixedly connected to the outer rings of both ends of the rotating rod 4, and the spiral directions of the spiral blades 5 on both sides are opposite; when working, the NdFeB alloy flakes are poured into the interior of the hopper 2, the motor 3 drives the rotating rod 4 to rotate, drives the spiral blades 5 on both sides to rotate, and pushes the NdFeB alloy flakes to move to the middle of the hopper 2 and fall down, and the NdFeB alloy flakes fall onto the center line of the conveyor belt 1, and the conveyor belt 1 transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace, which reduces the probability of the NdFeB alloy flakes falling when being transported on the conveyor belt 1, is convenient for the staff to operate, reduces the workload of the staff, and improves the safety of the staff loading.

[0056] like Figure 3 to Figure 4As shown, the outer ring of the rotating rod 4 is spirally fixed with a plurality of ball-head elastic rods 6, and the outer wall of the ball head of the ball-head elastic rod 6 is fixed with a plurality of elastic claws 7; the ball-head elastic rod 6 in this embodiment is an elastic rod with a marble fixed at one end; the middle part of the elastic claw 7 in this embodiment is an elastic rod, and the outer ring of the elastic rod is fixed with a plurality of arc-shaped claws; during operation, when the spiral blade 5 pushes the NdFeB alloy casting to move, the rotating rod 4 drives the ball-head elastic rod 6 to rotate, and drives the elastic claws 7 to scrape the NdFeB alloy casting, separating the adhered NdFeB alloy castings, thereby improving the separation rate between the NdFeB alloy castings, thereby improving the efficiency of the reaction between the NdFeB alloy castings and hydrogen.

[0057] like Figure 1 to Figure 2 As shown, a shell 8 is fixedly connected to the top surface of the middle part of the conveyor belt 1, and a plurality of dust hoods 9 are slidably installed inside the shell 8. A collecting box 10 is arranged at the bottom of the conveyor belt 1, and a vacuum pump 11 is arranged on the side of the collecting box 10. The air inlet end of the vacuum pump 11 is connected to the collecting box 10, and the top of the dust hood 9 is connected to the top of the collecting box 10 through a pipeline. When working, the rotating rod 4 drives the ball head elastic rod 6 to rotate, so that the ball head of the ball head elastic rod 6 hits the NdFeB alloy casting sheet, so that the NdFeB alloy casting sheet is The NdFeB alloy casting sheet vibrates, and the dust adhered to the surface of the NdFeB alloy casting sheet is shaken off to the top surface of the conveyor belt 1. When passing through the shell 8, the vacuum pump 11 is started to extract the air inside the collection box 10, so that a negative pressure is generated inside the collection box 10, and the dust hood 9 generates suction to suck up the dust on the top surface of the conveyor belt 1 and the surface of the NdFeB alloy casting sheet, and the dust is sucked into the collection box 10, thereby completing the cleaning of the NdFeB alloy casting sheet, and then improving the preparation quality of the sintered NdFeB permanent magnet material.

[0058] like Figure 2 , Figure 5 and Figure 6 As shown, a No. 1 screw 12 is rotatably installed on the top surface of the dust hood 9, and the No. 1 screw 12 passes through the top wall of the shell 8, and the No. 1 screw 12 is threadedly matched with the shell 8, a convex guide rail 13 is fixedly connected to one side of the dust hood 9, and a concave guide rail 14 is fixedly connected to the other side of the dust hood 9, and the convex guide rail 13 and the concave guide rail 14 are slidably matched; the convex sides of the convex guide rail 13 and the concave sides of the concave guide rail 14 in this embodiment are provided with grooves and protrusions, and the grooves and the protrusions are slidably matched, thereby reducing the probability of the convex guide rail 13 and the concave guide rail 14 being separated; when working, the No. 1 screw 12 is rotated to push the dust hood 9 to slide inside the shell 8, drive the convex guide rail 13 and the concave guide rail 14 to slide relative to each other, and control the distance between the dust hood 9 and the top surface of the conveyor belt 1, so as to facilitate the staff to adjust the suction force of the dust on the top surface of the conveyor belt 1 and the surface of the NdFeB alloy casting.

[0059] like Figure 5As shown, a cross bar 15 is fixedly connected to the middle part of the bottom side of the dust hood 9, and elastic plates 16 are fixedly connected to both sides of the bottom of the dust hood 9, and the sides of the elastic plates 16 on both sides are close to each other and slide with both sides of the top surface of the cross bar 15; when working, the suction force generated by the vacuum pump 11 causes the outside air to enter the dust hood 9 to generate wind, so that the elastic plate 16 bends toward the inside of the dust hood 9, exposing the bottom of the dust hood 9; when the vacuum pump 11 is turned off, the elastic plate 16 is reset, so that the elastic plate 16 cooperates with the cross bar 15 to seal the dust hood 9, thereby reducing the dust inside the dust hood 9 from falling back to the top surface of the conveyor belt 1, thereby further improving the cleanliness of the conveyor belt 1.

[0060] like Figure 5 As shown, a crescent-shaped convex rod 17 is rotatably mounted on one side of the shell 8 near the bottom of the conveyor belt 1, and the bottom of the crescent-shaped convex rod 17 is slidably matched with the top surface of the conveyor belt 1, and a torsion spring is arranged on the outer ring of the rotating shaft of the crescent-shaped convex rod 17, and a notch 18 is opened in the middle of the bottom surface of the crescent-shaped convex rod 17, and a plurality of elastic bars 19 are fixedly connected to the top surface of the notch 18, and a collision bead 20 is fixedly connected to the lower end of the elastic bar 19; The cross section is crescent-shaped, and both ends are arc-shaped; when working, when the NdFeB alloy casting sheet is brought to the shell 8 by the conveyor belt 1, the impact ball 20 hits the NdFeB alloy casting sheet, causing the spring bar 19 to bend. When the elastic force generated by the bending of the spring bar 19 is greater than the resistance of the impact ball 20, the spring bar 19 is reset, causing the impact ball 20 to hit the NdFeB alloy casting sheet, causing the NdFeB alloy casting sheet to vibrate violently, thereby further improving the efficiency of dust removal from the surface of the NdFeB alloy casting sheet.

[0061] like Figure 7 As shown, a mesh frame 21 is provided on one side of the collecting box 10 close to the vacuum pump 11, and a plurality of sponge balls 22 are filled inside the mesh frame 21. A support plate 23 is slidably mounted on the bottom of the collecting box 10, and a plurality of long hairs 24 are fixedly connected to the top surface of the support plate 23. Both sides of the mesh frame 21 in this embodiment are composed of mesh plates. During operation, dust on the top surface of the conveyor belt 1 and the surface of the NdFeB alloy casting sheet is sucked into the collecting box 10 and blocked by the mesh frame 21 and the sponge balls 22. When the vacuum pump 11 is turned off, dust falls onto the top surface of the support plate 23, and is blocked by the long hairs 24, thereby reducing the probability of dust flying inside the collecting box 10 and facilitating the cleaning work of the staff.

[0062] Embodiment 2

[0063] like Figure 8As shown, comparative example 1, wherein another implementation of the present invention is: a slide groove 25 is provided on the inner wall of one side of the shell 8 close to the bottom of the conveyor belt 1, a No. 2 screw rod 26 is rotatably installed inside the slide groove 25, the No. 2 screw rod 26 rotates and passes through the side wall of the slide groove 25, a stopper 27 is slidably installed inside the slide groove 25, the outer ring of the No. 2 screw rod 26 is threadedly matched with the inner ring of the stopper 27, and the stopper 27 is slidably matched with the crescent-shaped protrusion 17; during operation, the No. 2 screw rod 26 is rotated to drive the stopper 27 to slide along the slide groove 25, pushing the crescent-shaped protrusion 17 to rotate, thereby adjusting the distance between the lower end of the crescent-shaped protrusion 17 and the top surface of the conveyor belt 1, and then adjusting the amount of NdFeB alloy castings passing through.

[0064] During operation: cerium, neodymium, cobalt, boron, copper, aluminum and iron are smelted to obtain NdFeB alloy flakes; the NdFeB alloy flakes are poured into the interior of the hopper 2, the motor 3 drives the rotating rod 4 to rotate, the rotating rod 4 drives the ball-end elastic rod 6 to rotate, and drives the elastic claw 7 to scrape the NdFeB alloy flakes, so as to separate the adhered NdFeB alloy flakes, thereby improving the separation rate between the NdFeB alloy flakes, the rotating rod 4 drives the spiral blades 5 on both sides to rotate, and pushes the NdFeB alloy flakes to move to the middle of the hopper 2 and fall down, and the NdFeB alloy flakes fall onto the center line of the conveyor belt 1, thereby reducing the probability of the NdFeB alloy flakes falling when being transported on the conveyor belt 1;

[0065] When the NdFeB alloy casting sheet is transported to the housing 8 by the conveyor belt 1, the impact ball 20 hits the NdFeB alloy casting sheet, causing the spring bar 19 to bend. When the elastic force generated by the bending of the spring bar 19 is greater than the resistance of the impact ball 20, the spring bar 19 is reset, causing the impact ball 20 to hit the NdFeB alloy casting sheet, causing the NdFeB alloy casting sheet to vibrate violently, thereby improving the dust separation on the surface of the NdFeB alloy casting sheet; the vacuum pump 11 is started to extract the air inside the collection box 10, so that negative pressure is generated inside the collection box 10. The dust hood 9 generates suction force, and the outside air enters the dust hood 9 to generate wind, so that the elastic plate 16 bends toward the inside of the dust hood 9, exposing the bottom of the dust hood 9, sucking up the dust on the top surface of the conveyor belt 1 and the surface of the NdFeB alloy casting sheet, and sucking the dust into the collection box 10 for collection; the dust is blocked by the mesh frame 21 and the sponge ball 22, and when the vacuum pump 11 is turned off, the dust falls onto the top surface of the support plate 23, and the dust is blocked by the long fluff 24, thereby reducing the probability of dust flying inside the collection box 10;

[0066] The conveyor belt 1 transports the NdFeB alloy casting sheet to the charging port of the hydrogen crushing furnace. After the feeding is completed, the hydrogen crushing furnace is closed, heated to 100 to 150°C, and carbon monoxide gas is introduced. The introduction of carbon monoxide gas is stopped after 1 to 3 hours; the hydrogen crushing furnace is evacuated, filled with argon, the carbon monoxide gas in the hydrogen crushing furnace is replaced, and then evacuated again; the vacuum pump is turned off, and hydrogen is filled into the hydrogen crushing furnace, so that the NdFeB alloy casting sheet reacts with the hydrogen, and the NdFeB alloy casting sheet expands and breaks;

[0067] The NdFeB alloy powder is ground again, and the obtained alloy powder is added into a molding die for compression molding; the surface of the formed NdFeB alloy body is grinded and cut; the shaped NdFeB alloy body is sintered at 1000°C for 10 hours under vacuum conditions, and then tempered to 900°C for 3 hours and then cooled to obtain a sintered NdFeB permanent magnet semi-finished product; a mixed slurry of dysprosium, terbium, copper and aluminum is applied to the surface of the sintered NdFeB permanent magnet semi-finished product, treated at 800°C for 8 to 12 hours, then cooled to 500°C and kept warm for 6 to 12 hours, and finally cooled to room temperature to obtain a sintered NdFeB permanent magnet finished product.

[0068] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for manufacturing sintered NdFeB permanent magnet material, characterized in that: The manufacturing method comprises the following steps: A1: Smelting cerium, neodymium, cobalt, boron, copper, aluminum and iron to obtain NdFeB alloy castings; A2: Put the NdFeB alloy casting into a hydrogen crushing furnace, crush it by hydrogen crushing process, and then grind it to obtain alloy powder; A3: Add the alloy powder into the molding die and press it into shape; A4: Grind and cut the surface of the formed NdFeB alloy body; A5: The shaped NdFeB alloy body is sintered at 1000°C for 10 hours under vacuum conditions, and then tempered to 900°C for 3 hours and cooled to obtain a sintered NdFeB permanent magnet semi-finished product; A6: Apply a slurry of dysprosium, terbium, copper and aluminum to the surface of the semi-finished sintered NdFeB permanent magnet, treat it at 800℃ for 8 to 12 hours, then cool it down to 500℃ and keep it for 6 to 12 hours, and finally cool it down to room temperature to obtain the finished sintered NdFeB permanent magnet; The hydrogen crushing process described in A2 comprises the following steps: B1: pouring the NdFeB alloy flakes into the hopper (2), starting the motor (3) to drive the spiral blades (5) on both sides to rotate, pushing the NdFeB alloy flakes to move to the middle of the hopper (2) and fall down, and the NdFeB alloy flakes fall onto the center line of the conveyor belt (1), and the conveyor belt (1) transports the NdFeB alloy flakes to the charging port of the hydrogen crushing furnace; The top of the bottom end of the conveyor belt (1) in B1 is fixedly connected to a hopper (2), one side of the hopper (2) is fixedly connected to a motor (3), a rotating rod (4) is rotatably mounted inside the hopper (2), one end of the rotating rod (4) is fixedly connected to the rotating shaft of the motor (3), and spiral blades (5) are fixedly connected to the outer rings of both ends of the rotating rod (4), and the spiral directions of the spiral blades (5) on both sides are opposite; The outer ring of the rotating rod (4) is spirally fixedly connected to a plurality of ball-end elastic rods (6), and the outer wall of the ball end of the ball-end elastic rod (6) is fixedly connected to a plurality of elastic claws (7).

2. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 1, characterized in that: The hydrogen crushing process described in A2 also includes the following steps: B2: Heat the hydrogen crushing furnace to 100 to 150°C, introduce carbon monoxide gas, and stop introducing carbon monoxide gas after 1 to 3 hours; B3: Evacuate the hydrogen crushing furnace, fill it with argon, replace the carbon monoxide gas in the hydrogen crushing furnace, and then evacuate it; B4: Turn off the vacuum pump and fill the hydrogen crushing furnace with hydrogen to make the NdFeB alloy castings react with the hydrogen, causing the NdFeB alloy castings to expand and break.

3. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 2, characterized in that: A shell (8) is fixedly connected to the top surface of the middle of the conveyor belt (1), and a plurality of dust hoods (9) are slidably mounted inside the shell (8). A collecting box (10) is arranged at the bottom of the conveyor belt (1), and a vacuum pump (11) is arranged on the side of the collecting box (10). The air inlet end of the vacuum pump (11) is connected to the collecting box (10), and the top of the dust hood (9) is connected to the top of the collecting box (10) through a pipeline.

4. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 3, characterized in that: A No. 1 screw rod (12) is rotatably mounted on the top surface of the dust hood (9); the No. 1 screw rod (12) penetrates the top wall of the shell (8), and the No. 1 screw rod (12) is threadedly engaged with the shell (8); a convex guide rail (13) is fixedly connected to one side of the dust hood (9); a concave guide rail (14) is fixedly connected to the other side of the dust hood (9); the convex guide rail (13) and the concave guide rail (14) are slidably engaged with each other.

5. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 4, characterized in that: A cross bar (15) is fixedly connected to the middle of the bottom side of the dust hood (9), and elastic plates (16) are fixedly connected to both sides of the bottom of the dust hood (9), and the sides of the elastic plates (16) on both sides are slidably matched with the two sides of the top surface of the cross bar (15).

6. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 4, characterized in that: A crescent-shaped convex rod (17) is rotatably mounted on one side of the shell (8) close to the bottom of the conveyor belt (1); the bottom of the crescent-shaped convex rod (17) is slidably matched with the top surface of the conveyor belt (1); a torsion spring is arranged on the outer ring of the rotating shaft of the crescent-shaped convex rod (17); a notch (18) is provided in the middle of the bottom surface of the crescent-shaped convex rod (17); a plurality of elastic bars (19) are fixedly connected to the top surface of the notch (18); and a collision bead (20) is fixedly connected to the lower end of the elastic bar (19).

7. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 4, characterized in that: A mesh frame (21) is provided on one side of the collection box (10) close to the vacuum pump (11), the mesh frame (21) is filled with a plurality of sponge balls (22), a support plate (23) is slidably mounted on the bottom of the collection box (10), and a plurality of long hairs (24) are fixedly connected to the top surface of the support plate (23).

8. The method for manufacturing a sintered NdFeB permanent magnet material according to claim 7, characterized in that: A slide groove (25) is provided on the inner wall of one side of the housing (8) close to the bottom of the conveyor belt (1), a second screw rod (26) is rotatably installed inside the slide groove (25), the second screw rod (26) rotates and penetrates the side wall of the slide groove (25), a stopper (27) is slidably installed inside the slide groove (25), the outer ring of the second screw rod (26) is threadedly matched with the inner ring of the stopper (27), and the stopper (27) is slidably matched with the crescent-shaped convex rod (17).

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