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Preparation method and forming die of annular sintered neodymium-iron-boron magnet

A molding die, NdFeB technology, applied in the direction of magnets, magnetic objects, inductors/transformers/magnets, etc., to achieve the effects of low density, improved utilization, and material saving

Pending Publication Date: 2020-11-10
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to design a preparation method and forming mold of a ring-shaped sintered NdFeB magnet with high material utilization rate, easy processing, and sintering that is not easy to crack

Method used

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  • Preparation method and forming die of annular sintered neodymium-iron-boron magnet

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preparation example Construction

[0035] The preparation method of the ring-shaped sintered NdFeB magnet of the present invention, the preparation process of the magnet, comprises the preparation of the NdFeB flake alloy according to the quick-setting thin strip process, and the sintering of the NdFeB flake alloy through hydrogen treatment and jet milling process. For NdFeB powder, the powder is formed under the condition of pressure and parallel magnetic field for the first time, and the formed body is formed for the second time under the condition of liquid isostatic pressing, and then vacuum sintered and densified in a vacuum sintering furnace. Carry out heat treatment in a heat treatment furnace to obtain a rough blank.

[0036] The quick-setting thin strip process, the hydrogen treatment process, and the jet milling process of the aforementioned preparation process all adopt currently known or well-known technologies. The composition of the NdFeB powder refers to the commercially available general-purpose...

Embodiment 1

[0050] a) Prepare 20g of alumina powder and 40g of polyethylene glycol colloidal solution, mix and stir evenly, in a cylindrical rubber mold, isostatically press at 200Mpa, and dry at 120°C for 2h , prepare flexible cylindrical core, the diameter of this flexible cylindrical core is R1 is 4mm, and length W1 is 50mm;

[0051] b) In the loose state, pour 86g of powder into the forming mold, and the loose height L1 of the poured powder is 30mm;

[0052] c) Embed the flexible cylindrical core in the powder in a horizontal manner, so that its position in the height direction is at L1 / 2;

[0053] d) Close the indenter, and under the condition of a magnetic field of 1.5 Tesla, the powder and the core are integrally formed, and after demolding, a ring-shaped green body assembly is obtained;

[0054] e) After encapsulating the ring-shaped green body assembly, increase the density under 200Mpa hydroisostatic pressure;

[0055] f) Sintering and densifying the green body assembly in a v...

Embodiment 2

[0062] a) Prepare 36g of alumina powder and 40g of polyethylene glycol colloidal solution, mix and stir evenly, in a cylindrical rubber mold, isostatically press at 200Mpa, and dry at 120°C for 2h , preparing a flexible cylindrical core, the diameter of the flexible cylindrical core is R1 is 5mm, and the length W1 is 50mm;

[0063] b) In the loose state, pour 86g of powder into the forming mold, and the loose height L1 of the poured powder is 31mm;

[0064] c) Embed the flexible cylindrical core in the powder in a horizontal manner, so that its position in the height direction is at L1 / 2;

[0065] d) Close the indenter, and under the condition of a magnetic field of 1.5 Tesla, the powder and the core are integrally formed, and after demolding, a ring-shaped green body assembly is obtained;

[0066] e) After encapsulating the ring-shaped green body assembly, increase the density under 200Mpa hydroisostatic pressure;

[0067] f) Sintering and densifying the green body assembly...

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Abstract

The invention provides a preparation method of an annular sintered neodymium-iron-boron magnet and a forming die of the annular sintered neodymium-iron-boron magnet. The forming die comprises a main body part, an upper pressing head, a lower pressing head and a die cavity; the main body part comprises two opposite non-magnetic-conductive side plates and two opposite magnetic-conductive side plates; in a space formed between the two non-magnetic-conductive side plates and the two magnetic-conductive side plates, the lower pressing head is located at the bottom of the space, and the upper pressing head is located at the top of the space. The die cavity is located between the upper pressing head and the lower pressing head, the flexible cylindrical core is placed in the die cavity, the flexible cylindrical core is placed in the die cavity after the neodymium iron boron magnetic powder in a loose state is placed in the die cavity during preparation, and a magnet finished product is obtained through pressing of a forming die. The method and the device with the mold core structure have the advantages that the material utilization rate and the product percent of pass can be greatly improved when the method and the device with the mold core structure are used for producing the annular sintered neodymium-iron-boron.

Description

technical field [0001] The invention relates to the field of manufacturing sintered NdFeB magnets, in particular to a method for preparing a ring-shaped sintered NdFeB magnet and a molding die thereof. Background technique [0002] Compared with traditional permanent magnet materials, sintered NdFeB permanent magnet materials are widely used in the world due to their high magnetic energy product. The products involve wind power generation, compressors, acoustic and electric components, new energy vehicles and other fields. According to the different conditions of use, the product shapes include square pieces, tiles, cylinders, rings, special shapes, etc. However, while sintered NdFeB is widely used, there are certain problems: the higher the complexity of the product shape, the higher the manufacturing cost of sintered NdFeB magnets, such as the higher cost of machining. [0003] Taking the ring-shaped sintered NdFeB magnet as an example, the current conventional production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F3/03B22F3/04B22F5/10B22F3/10
CPCH01F41/0266H01F1/0577B22F3/03B22F3/04B22F5/106B22F3/1007B22F2998/10B22F1/10B22F3/10B22F2003/247C22C2202/02C22C33/0278H01F1/0578H01F3/08H01F7/021
Inventor 董占吉彭众杰
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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