Multi-pole magnetic ring of anisotropic bonded NdFeB and manufacturing method thereof

An anisotropic, multi-pole magnetic ring technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problems of destroying the uniformity of magnetic powder, long production cycle, and poor consistency of circumferential size, etc., to achieve demagnetization Adjustable magnetic field strength, short production process and high production efficiency

Active Publication Date: 2018-05-22
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent proposes that its method can also be used for bonded magnets, except that the same bonded magnet and sintered magnet have similar matrix components, other preparation principles and methods are completely different, from the process flow, preparation environment, preparation equipment, to the preparation process. The powder preparation method, powder particle size, powder shape, binder, additive, powder formability and molding conditions, sintering or curing conditions, etc. are different, and the key process methods of its preparation have almost no translation and reference value
If this method is to be used in the preparation of bonded magnets, according to the characteristics of the preparation process of bonded magnets, it is not difficult to find that when using this method to compact two parts of bonded magnetic powder, especially the first two parts of bonded magnetic powder, the Under the action, the magnetic powder at the 2nd part of the pressure will partially move to the other non-pressurized parts of the annular cavity, destroying the uniformity of the magnetic powder in the annular cavity, in order to seek the balance of the force, and the final result is the prepared magnetic ring The circumferential density distribution is uneven, the magnetic properties of the magnetic ring are poor in uniformity, and the circumferential size is poor in consistency, and every two parts undergoes at least two orientation compaction processes and one demagnetization process, resulting in long production cycles and low efficiency.

Method used

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  • Multi-pole magnetic ring of anisotropic bonded NdFeB and manufacturing method thereof
  • Multi-pole magnetic ring of anisotropic bonded NdFeB and manufacturing method thereof
  • Multi-pole magnetic ring of anisotropic bonded NdFeB and manufacturing method thereof

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Effect test

Embodiment 1

[0035] Raw material of magnetic powder used in production: 4-pole magnetic ring is prepared by using anisotropic HDDR-NdFeB magnetic powder. The specific experiments are as follows.

[0036] (1) Weigh 22g of epoxy resin, fully dissolve it in 150g of acetone, then add 1000g of magnetic powder, stir and heat to completely volatilize the acetone to obtain dry magnetic powder evenly coated with epoxy resin, and finally add 3g Molybdenum disulfide and 2g of EH-type enhanced lubricant are fully mixed to obtain pre-compressed magnetic powder;

[0037] (2) Preheat the pre-compressed magnetic powder to 55°C in the hopper, and to 70°C in the material shoe. figure 1 with figure 2 The tile mold shown is preheated to 120°C, and the central angle of the tile mold is 89.9°±0.1°. Among them, by figure 1 with figure 2 It can be seen that the magnetic powder is in the tile-shaped cavity of the female mold 13a of the tile-shaped mold, and the two ends of the mold cavity are provided with ...

Embodiment 2

[0044] An 8-pole magnetic ring was prepared with anisotropic HDDR-NdFeB magnetic powder.

[0045] (1) Weigh 22g of epoxy resin, fully dissolve it in 150g of acetone, then add 1000g of magnetic powder, stir and heat to completely volatilize the acetone to obtain dry magnetic powder evenly coated with epoxy resin, and finally add 3g Molybdenum disulfide and 2g of EH-type enhanced lubricant are fully mixed to obtain pre-compressed magnetic powder;

[0046] (2) Preheat the pre-compressed magnetic powder to 55°C in the hopper, and to 100°C in the material shoe. Image 6 The tile-shaped mold shown is preheated to 120°C, and the central angle of the tile-shaped mold is 44.9°±0.1°. Among them, by Image 6 It can be seen that the magnetic powder is in the mold cavity of the female mold 14a of the tile-shaped mold, and the die cavity two ends are provided with the concave mold 14b of the tile-shaped mold and the punch 14c of the tile-shaped mold that are slidably matched with the mold...

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Abstract

The invention provides a multi-pole magnetic ring of anisotropic bonded NdFeB and a manufacturing method thereof. The multi-pole magnetic ring is an anisotropic bonded NdFeB 2n-pole magnetic ring, wherein n is a natural number larger than or equal to 2. 2n splicing lines are seen indistinctly or clearly on magnetic shoe splicing positions on the magnetic ring. The magnetic ring is obtained by a secondary forming method after 2n bonded anisotropic tile type workblanks which are performed by orientation pressing are spliced on an annular die, the central angle of the bonded anisotropic tile typeworkblank is [pi] / n. The manufacturing method is characterized by high magnetic ring orientation degree, high oriented magnetic field intensity, easy obtaining, good universality, adjustable demagnetized field intensity, short production process, high production efficiency, and low cost.

Description

technical field [0001] The invention relates to an anisotropic bonded NdFeB multi-pole magnetic ring and a preparation method thereof. Background technique [0002] Among anisotropic NdFeB magnetic rings, bonded NdFeB multipolar magnetic rings are compared with sintered NdFeB multipolar magnetic rings and hot-pressed and heat-deformed NdFeB multipolar magnetic rings, although their maximum magnetic energy product is lower. 30-50%, but it has the advantages of high material utilization rate, high dimensional accuracy, short manufacturing cycle, and easy processing. Therefore, anisotropic bonded NdFeB multipole magnetic ring has developed rapidly in recent years and has a good market prospect. [0003] However, the difficulty of preparing anisotropic bonded NdFeB multipole magnetic rings is far more difficult than that of isotropic bonded NdFeB magnetic rings. The difficulty in the preparation of anisotropic bonded NdFeB multipolar magnetic rings mainly lies in the design of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/00B22F3/02
CPCH01F1/0576H01F41/0266B22F3/02B22F2003/023B22F1/10B22F1/103
Inventor 秦国超饶晓雷蔡道炎敖学如胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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