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Manufacturing method of anisotropic bonded magnet

An anisotropic magnetic and anisotropic technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems that affect the wide use of anisotropic bonded magnets, complex mold structures, and low production efficiency. problems, to avoid mutual adhesion, simple mold structure and low cost

Active Publication Date: 2019-04-30
TAIYUAN KAIYUAN INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problems of low production efficiency, complex mold structure and high process cost in the existing manufacturing method under the condition of heating the magnetic powder, and magnetic field orientation after the binder is melted, which further affects the wide use of anisotropic bonded magnets, and provides A method for manufacturing an anisotropic bonded magnet, the method adopts normal temperature magnetic field molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method of manufacturing an anisotropic bonded magnet, comprising the steps of:

[0021] 1) Mix anisotropic magnetic powder and thermosetting binder;

[0022] 2) Add the mixture in step 1) into the mold cavity, perform pressure molding under an orientation magnetic field, and then demagnetize to obtain a green body;

[0023] 3) Put the green body of step 2) into a vacuum furnace for thermal curing; an anisotropic bonded magnet is obtained.

[0024] In step 1), the anisotropic magnetic powder is a mixture of one or more of anisotropic NdFeB magnetic powder, anisotropic SmFeN magnetic powder, anisotropic ferrite magnetic powder, and anisotropic SmCo magnetic powder in any proportion . As the thermosetting binder, a thermosetting resin is used. The adhesive can also be replaced with a nylon adhesive. The thermosetting binder is a thermosetting binder powder, and the nylon binder is a nylon binder powder; the particle size of the binder powder is 3-100 microns (for exa...

example

[0031] 1) Powder pretreatment: Mix 80% anisotropic NdFeB magnetic powder + 20% anisotropic SmFeN magnetic powder in a mixer for 5 minutes to obtain anisotropic magnetic powder. Silane coupling agent (KH-570) 1.5%, surfactant Tween-80, 3%; lubricant ethyl stearate, 2%; dilute with absolute ethanol 10 times the weight of the three, Stir evenly, add anisotropic magnetic powder according to 1% of the weight of the anisotropic magnetic powder, and mix evenly in a mixer.

[0032] 2) Mix the anisotropic magnetic powder after 1) pretreatment with 2% epoxy resin powder of the weight of the magnetic powder in a cold state, and the mixing time is 10 minutes.

[0033] 3) Put the mixed powder obtained in 2) into the mold cavity, perform magnetic field cold pressing and demagnetization to obtain a green body, the magnetic field is 1.2T, and the preforming pressure is 50MPa.

[0034] 4) Put the green body of 3) into the vacuum furnace for preheating at a temperature of 90°C for 50 minutes. ...

Embodiment 2

[0039] A method of manufacturing an anisotropic bonded magnet, comprising the steps of:

[0040] 1) Configure polyurethane binder: dissolve polyurethane in diluent;

[0041] 2) Mix the configured polyurethane binder with anisotropic magnetic powder, and then volatilize the diluent to obtain anisotropic magnetic powder whose particles are coated with polyurethane;

[0042] 3) Add anisotropic magnetic powder whose particles are coated with polyurethane into the mold cavity, perform pressure molding under an orientation magnetic field, and then demagnetize to obtain a green body;

[0043] 4) Curing the green body to obtain the finished product.

[0044] In step 1), the weight ratio of polyurethane to diluent is 1:1.5-4.0; at the same time, there is a curing agent in the polyurethane adhesive, and the amount of curing agent is 7-9% of the weight of polyurethane. For example, the curing agent is selected Biuret polyisocyanate, choose absolute ethanol as diluent.

[0045]In step ...

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PUM

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Abstract

The invention relates to a manufacturing method of a bonded magnet, in particular to a manufacturing method of an anisotropic bonded magnet. The existing manufacturing method has the disadvantages oflow production efficiency, complex die structure and high process cost for magnetic field alignment after binder melting under the condition of magnetic powder heating, which affects the wide use of anisotropic bonded magnets. The problem is solved by using the manufacturing method of the invention. The manufacturing method of an anisotropic bonded magnet includes the following steps: (1) mixing anisotropic magnetic powder with thermosetting binder; (2) adding the mixture in step (1) to a die cavity, carrying out pressure forming under an alignment magnetic field, and carrying out demagnetizing to obtain a green body; and (3) putting the green body in step (2) in a vacuum furnace for thermal curing to obtain an anisotropic bonded magnet. A magnetic field is formed at room temperature or ina cold state, so that the adhesion of magnetic powder particles is avoided, and the effect of magnetic field alignment is improved. The manufacturing method has the advantages of simple die structure, easy operation, high efficiency and low cost.

Description

technical field [0001] The invention relates to a manufacturing method of a bonded magnet, in particular to a manufacturing method of an anisotropic bonded magnet. Background technique [0002] Bonded magnets have the characteristics of being able to form complex shapes, high dimensional accuracy, no need for secondary processing, high material utilization, high production efficiency, low cost, and excellent magnetic properties. They are widely used in hard disk drives, optical drives, office automation, and consumer electronics. , household appliances, automobile industry, etc. are widely used. [0003] Compression molding is the main production method of bonded magnets: mix thermosetting binder and anisotropic magnetic powder, then add them into the mold cavity, heat up the mold cavity until the thermosetting binder melts, start to apply an orientation magnetic field and press molding, and then come out after demagnetization The mold is finally heat-cured. Since it is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B22F1/00B22F3/02
CPCH01F41/0273B22F3/02B22F1/10B22F2998/10B22F2999/00H01F1/083H01F1/113B22F2202/05B22F2003/248B22F3/12B22F1/102B22F3/24B22F2201/02H01F41/0266
Inventor 董永安
Owner TAIYUAN KAIYUAN INTELLIGENT EQUIP CO LTD