A preparation method of a neodymium iron boron magnet

Abstract

The present invention relates to the field of the preparation of neodymium iron boron magnets, and more specifically to a method for preparing neodymium iron boron magnets. The method includes the following steps: S1: Take out the neodymium iron boron powder and mix the neodymium iron boron powder with a binder; S2: Use a compaction device to compact and form the neodymium iron boron powder in a magnetic field to form a ring-shaped magnet; S3: Use the compaction device to press out an upper groove on the lower side of the ring-shaped magnet, press out a plurality of side grooves on the outer periphery of the ring-shaped magnet, and press out a plurality of bump grooves on the lower side of the ring-shaped magnet to obtain a neodymium iron boron rough blank; S4: Sinter the neodymium iron boron rough blank to obtain a neodymium iron boron magnet. The binder is aluminum powder. The compaction device includes a material box and a cylinder, and the cylinder is vertically slidably connected to the center of the material box. The compaction device further includes bumps, and four bumps are annularly arranged at the lower end of the cylinder, and the four bumps are vertically slidably connected to the material box. A ring-shaped magnet with an upper groove, side grooves and bump grooves can be processed.

Description

Technical Field

[0001] The present invention relates to the field of preparation of neodymium iron boron magnets, and more specifically to a method for preparing neodymium iron boron magnets. Background Art

[0002] Neodymium iron boron magnets are tetragonal crystal systems formed by neodymium, iron, and boron. This kind of magnet is currently the permanent magnet with the second highest magnetism after holmium magnet at absolute zero, and is also the most commonly used rare earth magnet. Neodymium iron boron magnets are widely used in electronic products, such as hard disks, mobile phones, headphones, and battery-powered tools, etc. However, the shapes of existing neodymium iron boron magnets are relatively uniform, mostly strip-shaped or ring-shaped, and cannot be stably installed on specific parts for fixation. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the present invention provides a method for preparing neodymium iron boron magnets, and its beneficial effect is that a ring magnet with an upper groove, a side groove, and a convex block groove can be processed, and the ring magnet can be stably installed on a specific part for fixation through the upper groove, the side groove, and the convex block groove.

[0004] A method for preparing neodymium iron boron magnets includes the following steps:

[0005] S1: Take out neodymium iron boron powder and mix the neodymium iron boron powder with a binder;

[0006] S2: Use a compaction device to compact and form the neodymium iron boron powder in a magnetic field to form a ring magnet;

[0007] S3: Use the compaction device to press out an upper groove on the lower side of the ring magnet, press out a plurality of side grooves on the outer periphery of the ring magnet, and press out a plurality of convex block grooves on the lower side of the ring magnet to obtain a neodymium iron boron rough blank;

[0008] S4: Sinter the neodymium iron boron rough blank to obtain a neodymium iron boron magnet.

[0009] The binder is aluminum powder.

[0010] The compaction device includes a material box and a cylinder, and the cylinder is vertically slidably connected to the center of the material box.

[0011] The compaction device further includes a convex block, and four convex blocks are annularly arranged at the lower end of the cylinder, and the four convex blocks are vertically slidably connected to the material box. Description of the Drawings

[0012] The following further elaborates on the present invention in detail with reference to the drawings and specific implementation methods.

[0013] Figure 1 It is a flowchart of a method for preparing neodymium iron boron magnets;

[0014] Figure 2Structural schematic of the compaction device Figure 1 ;

[0015] Figure 3 Structural schematic of the compaction device Figure 2 ;

[0016] Figure 4 Structural schematic of the material box Figure 1 ;

[0017] Figure 5 Structural schematic of the material box Figure 2 ;

[0018] Figure 6 Structural schematic of the circular plate Figure 1 ;

[0019] Figure 7 Structural schematic of the circular plate Figure 2 ;

[0020] Figure 8 Structural schematic of the support Figure 1 ;

[0021] Figure 9 Structural schematic of the support Figure 2 ;

[0022] Figure 10 Structural schematic of the vertical frame;

[0023] Figure 11 Structural schematic of the ring magnet Figure 1 ;

[0024] Figure 12 Structural schematic of the ring magnet Figure 2 ;

[0025] Figure 13 Structural schematic of the installation location of the neodymium iron boron magnet.

[0026] In the figure: material box 101; support leg 102; ring 103; hinge rod 104; insert piece 105; convex block 106; cylinder 107; fastening screw 108; hydraulic cylinder I 109;

[0027] circular plate 201; strip groove 202; dial post 203; retaining ring 204;

[0028] support 301; ring plate 302; convex rib 303; dial groove 304; cross fork 305; motor I 306;

[0029] vertical frame 401; hydraulic cylinder II 402; square column 403; motor II 404;

[0030] ring magnet 501; upper groove 502; side groove 503; convex block groove 504. Specific Embodiment

[0031] A method for preparing a neodymium iron boron magnet, comprising the following steps:

[0032] S1: Take out the neodymium iron boron powder and mix the neodymium iron boron powder with a binder;

[0033] S2: Use a compaction device to compact and form the neodymium iron boron powder in a magnetic field to form a ring-shaped magnet 501;

[0034] S3: Use the compaction device to press out an upper groove 502 on the lower side of the ring-shaped magnet 501, press out a plurality of side grooves 503 on the outer periphery of the ring-shaped magnet 501, and press out a plurality of bump grooves 504 on the lower side of the ring-shaped magnet 501 to obtain a neodymium iron boron rough blank;

[0035] S4: Sinter the neodymium iron boron rough blank to obtain a neodymium iron boron magnet.

[0036] The binder is aluminum powder.

[0037] As Figure 4-5 shown, this example can achieve the effect of pressing the neodymium iron boron powder into a ring shape.

[0038] Since the compaction device includes a material box 101 and a cylinder 107, the cylinder 107 is vertically and clearance-fitted and inserted at the center of the material box 101. Furthermore, the cylinder 107 is convenient to be disassembled from the material box 101. Then, the neodymium iron boron powder is poured into the material box 101, and then the neodymium iron boron powder is compacted, and then the neodymium iron boron powder is pressed into a ring shape to form a ring-shaped magnet 501.

[0039] As Figure 4-5 shown, this example can achieve the effect of conveniently installing the ring-shaped magnet 501 on the part as Figure 13 shown and fixing it.

[0040] Since the compaction device further includes four bumps 106 which are integrally formed in a ring shape at the lower end of the cylinder 107, and the four bumps 106 are vertically slidably connected to the material box 101. Furthermore, since the four bumps 106 protrude upward relative to the bottom surface of the material box 101, four bump grooves 504 are uniformly formed on the inner edge of the lower side of the ring-shaped magnet 501. The four bump grooves 504 can conveniently install the ring-shaped magnet 501 on the part as Figure 13 shown and fix it, and prevent the ring-shaped magnet 501 from rotating relative to the part as Figure 13 shown after installation, so that the ring-shaped magnet 501 is stably installed on the part as Figure 13 shown for fixing. When the cylinder 107 slides up and down relative to the material box 101, the protruding size of the four bumps 106 can be adjusted, and thus the depth of the four formed bump grooves 504 can be adjusted.

[0041] As Figure 5 shown, this example can achieve the effect of fixing the relative position of the cylinder 107 and the cartridge 101.

[0042] Since the compaction device further includes fastening screws 108, the lower side of the cartridge 101 is threadedly connected with the fastening screws 108, and the fastening screws 108 press on one of the bumps 106. By rotating the fastening screws 108, the relative position of the cylinder 107 and the cartridge 101 can be fixed.

[0043] As Figure 4-5 shown, this example can achieve the effect of supporting the cartridge 101.

[0044] Since the compaction device further includes legs 102, four legs 102 are connected to the lower side of the cartridge 101 by screws. The four legs 102 facilitate the support of the cartridge 101 and support the cartridge 101.

[0045] As Figure 4-5 shown, this example can achieve the effect of facilitating the manual picking up and installation of the annular magnet 501.

[0046] Since the compaction device further includes inserts 105, there are four inserts 105, and the four inserts 105 are respectively inserted into the four sides of the cartridge 101 with a clearance fit. By inserting the four inserts 105 into the cartridge 101, four side grooves 503 can be uniformly formed on the outer periphery of the annular magnet 501. The four side grooves 503 can effectively increase the friction on the outer periphery of the annular magnet 501, thereby facilitating the manual picking up and installation of the annular magnet 501.

[0047] As Figure 4-5 shown, this example can achieve the effect of driving the four inserts 105 to insert or pull out relative to the cartridge 101 through the four hinge rods 104.

[0048] Since the compaction device further includes a ring 103, hinge rods 104 and a hydraulic cylinder I 109, four hinge rods 104 are hinged on the ring 103, and the upper ends of the four hinge rods 104 are respectively hinged on the outer sides of the four inserts 105. The lower side of the cartridge 101 is connected with the hydraulic cylinder I 109 by a flange, and the movable end of the hydraulic cylinder I 109 is connected to the ring 103 by a flange. Furthermore, the lifting of the ring 103 can be driven by the telescopic movement of the hydraulic cylinder I 109, and then the four inserts 105 can be driven by the four hinge rods 104 to insert or pull out relative to the cartridge 101. After the side grooves 503 are cut on the annular magnet 501, the four inserts 105 can be pulled out.

[0049] As Figure 8-9 shown, this example can achieve the effect of helping to distinguish the upper and lower sides of the annular magnet 501.

[0050] Since the compaction device further includes an annular plate 302 and convex ribs 303, the annular plate 302 is disposed above the material box 101, and convex ribs 303 are provided on the annular plate 302. By moving the annular plate 302 downward, it can press against the neodymium iron boron powder in the material box 101, thereby compacting the neodymium iron boron powder; the convex ribs 303 can press out an upper groove 502 on the upper side of the annular magnet 501, and the upper groove 502 can help distinguish the upper side and the lower side of the annular magnet 501.

[0051] As Figure 8-10 shown, this example can achieve the effect of pressing the annular plate 302 against the material box 101.

[0052] Since the compaction device further includes a bracket 301, a vertical frame 401, a hydraulic cylinder II 402, a square column 403, and a motor II 404, the annular plate 302 is connected to the bracket 301 by screws. There is one vertical frame 401 on each of the left and right sides. The upper part of each vertical frame 401 is vertically slidably connected to a square column 403. The upper parts of the two square columns 403 are both connected to a motor II 404 by screws. The output shafts of the two motor II 404 are respectively connected to both sides of the vertical frame 401 by flanges. A hydraulic cylinder II 402 is connected to each vertical frame 401 by a flange. The movable ends of the two hydraulic cylinders II 402 are respectively connected to the upper parts of the two square columns 403 by flanges. Thus, by the telescoping of the two hydraulic cylinders II 402, the two square columns 403 can be driven to rise and fall, and further drive the bracket 301 and the annular plate 302 to rise and fall, so that the annular plate 302 presses against the material box 101.

[0053] The compaction device further includes a circular plate 201, a strip-shaped groove 202, a dialing column 203, a retaining ring 204, a dialing groove 304, a cross fork 305, and a motor I 306. The circular plate 201 is welded to the bracket 301. The circular plate 201 and the annular plate 302 are oppositely arranged on the bracket 301. Four strip-shaped grooves 202 are annularly arranged on the circular plate 201. One end of each strip-shaped groove 202 is close to the inner circumference of the circular plate 201, and the other end is close to the outer circumference of the circular plate 201. A dialing column 203 is inserted in each of the four strip-shaped grooves 202. Two retaining rings 204 are welded to the middle of each dialing column 203. The two retaining rings 204 on the dialing column 203 are respectively located on both sides of the circular plate 201. A motor I 306 is connected to the middle of the bracket 301 by screws. A cross fork 305 is connected to the output shaft of the motor I 306 by screws. Four dialing grooves 304 are provided on the cross fork 305. The upper parts of the four dialing columns 203 are respectively inserted in the four dialing grooves 304.

[0054] As Figure 6-9 shown, this example can achieve the effect of arranging the neodymium iron boron powder according to the magnetic field environment.

[0055] After adding neodymium iron boron powder and binder into the cartridge 101, the bracket 301 is driven by two motors II 404 to rotate about the axis of the output shafts of the two motors II 404, so as to turn the circular plate 201 to the downward position. Brakes are provided on both of the two motors II 404 to fix the positions of the bracket 301 and the circular plate 201 at this time. Then, the four dial posts 203 are inserted into the neodymium iron boron powder in the cartridge 101. Then, the motor I 306 continuously drives the cross fork 305 to rotate forward and backward, so as to drive the four dial posts 203 to slide along the four strip-shaped grooves 202 respectively through the four dial grooves 304. The four dial posts 203 slide back and forth between the outer and inner sides of the cartridge 101 to fully stir the neodymium iron boron powder and binder in the cartridge 101. In an environment with a magnetic field, the neodymium iron boron powder is arranged according to the magnetic field environment.

[0056] A neodymium iron boron magnet is prepared by the preparation method of the neodymium iron boron magnet, which includes an annular magnet 501, an upper groove 502, a side groove 503 and a convex block groove 504. An upper groove 502 is arranged on the upper side of the annular magnet 501. Four side grooves 503 are evenly arranged on the outer periphery of the annular magnet 501. Four convex block grooves 504 are evenly arranged on the inner edge of the lower side of the annular magnet 501.

Claims

1. A method for preparing a neodymium iron boron magnet, characterized in that, it comprises the following steps: S1: Take out the neodymium iron boron powder and mix the neodymium iron boron powder with a binder; S2: Compact the neodymium iron boron powder into a ring magnet (501) using a compaction device in a magnetic field; S3: Use the compaction device to press out an upper groove (502) on the lower side of the ring magnet (501), press out a plurality of side grooves (503) on the outer circumference of the ring magnet (501), and press out a plurality of bump grooves (504) on the lower side of the ring magnet (501) to obtain a neodymium iron boron rough blank; S4: Sinter the neodymium iron boron rough blank to obtain a neodymium iron boron magnet; The binder is aluminum powder; The compaction device includes a material box (101) and a cylinder (107), and a cylinder (107) is vertically slidably connected to the center of the material box (101); The compaction device further includes bumps (106), and four bumps (106) are annularly arranged at the lower end of the cylinder (107), and the four bumps (106) are vertically slidably connected to the material box (101); The compaction device further includes fastening screws (108), and fastening screws (108) are threadedly connected to the lower side of the material box (101), and the fastening screws (108) press on one of the bumps (106); The compaction device further includes legs (102), and four legs (102) are fixedly connected to the lower side of the material box (101); The compaction device further includes insertion pieces (105), there are four insertion pieces (105), and the four insertion pieces (105) are respectively slidably connected to the four sides of the material box (101); The compaction device further includes a ring (103), hinge rods (104) and a hydraulic cylinder I (109), four hinge rods (104) are hinged on the ring (103), the upper ends of the four hinge rods (104) are respectively hinged to the outside of the four insertion pieces (105), a hydraulic cylinder I (109) is fixedly connected to the lower side of the material box (101), and the movable end of the hydraulic cylinder I (109) is fixedly connected to the ring (103); The compaction device further includes a ring plate (302) and a convex rib (303), the ring plate (302) is located above the material box (101), and a convex rib (303) is arranged on the ring plate (302); The four bumps (106) protrude upward relative to the bottom surface of the material box (101), so that four bump grooves (504) are uniformly formed along the inner edge of the lower side of the ring magnet (501); the four insertion pieces (105) are inserted into the material box (101), and four side grooves (503) are uniformly formed on the outer circumference of the ring magnet (501); the convex rib (303) presses out an upper groove (502) on the upper side of the ring magnet (501); The compaction device further includes a bracket (301), a vertical bracket (401), a hydraulic cylinder II (402), a square column (403), and a motor II (404). The ring plate (302) is fixedly connected to the bracket (301). There is one vertical bracket (401) provided on each of the left and right sides. The upper part of each vertical bracket (401) is vertically slidably connected to a square column (403). The upper parts of the two square columns (403) are fixedly connected with motors II (404). The output shafts of the two motors II (404) are respectively fixed on both sides of the vertical bracket (401). A hydraulic cylinder II (402) is fixedly connected to each vertical bracket (401). The movable ends of the two hydraulic cylinders II (402) are respectively fixed on the upper parts of the two square columns (403).

2. A method for preparing a neodymium iron boron magnet according to claim 1, wherein: The compaction device further includes a circular plate (201), a strip-shaped groove (202), a dial post (203), a retaining ring (204), a dial groove (304), a cross fork (305), and a motor I (306). The circular plate (201) is welded to the bracket (301). The circular plate (201) and the ring plate (302) are oppositely arranged on the bracket (301). Four strip-shaped grooves (202) are annularly arranged on the circular plate (201). One end of each strip-shaped groove (202) is close to the inner circumference of the circular plate (201), and the other end is close to the outer circumference of the circular plate (201). Dial posts (203) are inserted into the four strip-shaped grooves (202). Two retaining rings (204) are welded to the middle of each dial post (203). The two retaining rings (204) on the dial post (203) are respectively located on both sides of the circular plate (201). A motor I (306) is connected to the middle of the bracket (301) by screws. A cross fork (305) is connected to the output shaft of the motor I (306) by screws. Four dial grooves (304) are arranged on the cross fork (305). The upper parts of the four dial posts (203) are respectively inserted into the four dial grooves (304).

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