Shaped permanent magnet and preparation method thereof, and equipment for preparing shaped permanent magnet

A permanent magnet, special-shaped technology, applied in the direction of magnets, magnetic objects, permanent magnets, etc., can solve the problems of large waste, low material yield, low preparation efficiency, etc., and achieve the effect of high efficiency and high material yield

Active Publication Date: 2018-10-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, cutting is required, so there is a huge waste and the disadvantage of low material yield
[0004] The existing thermal deformation process includes molding, extrusion molding and rolling, etc., but there are the following problems: the uniformity of the magnetic properties of the produced magnet is poor, the degree of automation is not high, and the preparation efficiency is low. It is necessary to develop a process and equipment for continuous hot pressing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Shaped permanent magnet and preparation method thereof, and equipment for preparing shaped permanent magnet
  • Shaped permanent magnet and preparation method thereof, and equipment for preparing shaped permanent magnet
  • Shaped permanent magnet and preparation method thereof, and equipment for preparing shaped permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The invention provides a preparation method of a special-shaped permanent magnet, which comprises the following steps:

[0036] S1, providing magnetic powder with magnetocrystalline anisotropy;

[0037] S2, performing hot pressing and heat deformation on the magnetic powder in sequence to obtain a heat deformed blank; and

[0038] S3, providing a shaping mold, the end surface of the indenter of the shaping mold includes at least one arc surface, putting the heat-deformed blank into the shaping mold, and heating and applying pressure to the heat-deformed blank, so that the The heat-deformed blank undergoes rheology and fills the mold cavity of the shaping mold to obtain a special-shaped permanent magnet, wherein the surface of the special-shaped permanent magnet includes at least one arc surface.

[0039] In step S1, the magnetic powder is at least one of NdFeB magnetic powder, SmCo magnetic powder, and SmFeN magnetic powder. The magnetic powder can be purchased from t...

Embodiment (1

[0049] The preparation process of the single-arc special-shaped permanent magnet is as follows:

[0050] (1) Hot pressing: Sm with a particle size of 50-100 microns 2 co 17 Put the magnetic powder into the first mold, heat the magnetic powder to a first temperature in a vacuum environment, and apply a first pressure to the first mold to obtain a hot-pressed blank, wherein the first temperature is 700°C, and the first A pressure is 200MPa, and the vacuum degree of the vacuum environment is 3×10 -2 Pa.

[0051] (2) Thermal deformation: put the hot-pressed blank into the second mold, heat the hot-pressed blank to the second temperature in argon gas, and make the hot-pressed blank undergo deformation with a deformation amount of 80% , and then apply a second pressure to the deformed hot-press blank to obtain a hot-deformed blank 4, wherein the second temperature is 850° C., and the second pressure is 100 MPa.

[0052] (3) Shaping and shaping: put the thermally deformed blank 4...

Embodiment (2

[0057] The preparation process of double-arc shaped permanent magnets with different radii of inner and outer arcs is as follows:

[0058] (1) Hot pressing: Nd with a particle size of 50-350 microns 2 Fe 14 B The magnetic powder is put into the first mold, the magnetic powder is heated to the first temperature in a vacuum environment, and the first pressure is applied to the first mold to obtain a hot-pressed blank, wherein the first temperature is 680°C, the The first pressure is 150MPa, and the vacuum degree of the vacuum environment is 5×10 -2 Pa.

[0059] (2) Thermal deformation: put the hot-pressed blank into the second mold, heat the hot-pressed blank to the second temperature in argon, and make the hot-pressed blank undergo deformation with a deformation amount of 70%. , and then apply a second pressure to the deformed hot-press blank to obtain a hot-deformed blank 4, wherein the second temperature is 830° C., and the second pressure is 70 MPa.

[0060] (3) Shaping ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a preparation method of shaped permanent magnet. The preparation method comprises the following steps: (1) providing magnetic powder with magnetocrystalline anisotropy; (2) orderly hot-pressing and thermal deformation on the magnetic powder to obtain thermally deformed blank; (3) providing a reshaping die,, wherein the pressure head end surface of the reshaping die comprises at least one arc surface, placing the thermally deformed blank into the reshaping die, and heating the thermally deformed green and exerting force on the same, thereby enabling the thermally deformed blank to be in rheological and fill in a die cavity of the reshaping die to obtain the shaped permanent magnet, wherein the surface of the shaped permanent magnet comprises at least one arc surface. The invention further provides a shaped permanent magnet obtained by adopting the above preparation method and the equipment for preparing the shaped permanent magnet.

Description

technical field [0001] The invention relates to a special-shaped permanent magnet, a preparation method thereof, and equipment for preparing the special-shaped permanent magnet. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials based on intermetallic compounds formed by rare earth metal elements and transition metals. Rare earth permanent magnets are widely used in the computer industry, automobile industry, communication information industry, medical industry, speaker equipment and video playback industry, wind power generation and home appliance industry, etc., and have become a global pillar industry and an important material basis for high-tech industries. [0003] Tile-type rare earth permanent magnets (special-shaped magnets) are mainly used in the rotor or stator of permanent magnet motors such as motors and generators. The existing method for preparing tile-shaped rare earth permanent magnets is the sintering method, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F41/02
CPCH01F7/021H01F41/0266
Inventor 靳朝相陈仁杰剧锦云唐旭尹文宗闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap