Sintered NdFeB powder orienting method

A NdFeB powder technology is applied in the field of orientation of sintered NdFeB powders, which can solve the problems of reducing the consistency of magnetic properties of sintered NdFeB blanks, agglomeration of NdFeB powders, incomplete orientation of powder particles, etc. Achieve better consistency of magnetic properties, uniform initial pressure density, and uniform packing density

Active Publication Date: 2013-04-03
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the orientation method of sintered NdFeB powder is mostly one-time orientation, that is, the current of the pole head is directly added from zero ampere to the current saturation point, and it rises in a straight line. Complete, that is, if the arrangement position is wrong, the consistency of the magnetic properties of the sintered NdFeB blank is reduced, and the density of the blank is not uniform

Method used

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  • Sintered NdFeB powder orienting method
  • Sintered NdFeB powder orienting method
  • Sintered NdFeB powder orienting method

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Embodiment Construction

[0012] A method for orienting sintered NdFeB powders, comprising the following steps:

[0013] a. Put the NdFeB blank powder into the mold cavity;

[0014] b. The poles on both sides of the press are fed with vibration or alternating current to form a vibration magnetic field;

[0015] c. Mold pressing;

[0016] d. After the pressing is completed, a small reverse current is applied to the pole heads on both sides for demagnetization to obtain a blank.

[0017] The poles on both sides of the press can be fed into the same direction with the interval increased to the saturation magnetic field strength, or the positive and reverse currents can form a vibrating magnetic field. The NdFeB powder shakes in the mold cavity, which largely eliminates NdFeB The agglomeration phenomenon of the powder improves the degree of orientation, and the magnetic properties of each part of the blank are more consistent. During the shaking process, the filling density of the powder in the mold cavi...

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Abstract

The invention relates to the field of ferromagnetic material processing, in particular to an orientation method of sintered NdFeB powder, comprising the following steps: a. putting NdFeB blank powder into a mold cavity; Alternating current to form a vibrating magnetic field; c, mold pressing; d, after the pressing is completed, a small current reverse current is applied to the pole heads on both sides to demagnetize, and the blank is obtained. The poles on both sides of the press are alternately fed with vibration or alternating current to form a vibrating magnetic field. The NdFeB powder shakes in the mold cavity, which largely eliminates the agglomeration of the NdFeB powder, so that the degree of orientation is improved. The consistency of some magnetic properties is better. During the shaking process, the powder filling density in the mold cavity is more uniform, so that the initial pressure density after pressing is more uniform, and the shape and position tolerance of the sintered blank is better, reducing the grinding of the blank. Reduced volume and cost savings.

Description

technical field [0001] The invention relates to the field of ferromagnetic material processing, in particular to an orientation method of sintered NdFeB powder. Background technique [0002] Sintered NdFeB is an anisotropic magnet. It is necessary to orient the alloy powder in a magnetic field to form a directional structure, so that the magnet will have high magnetic properties. When the NdFeB rough powder is formed and oriented, the powder is put into the mold cavity, and the poles on both sides start to energize to generate a magnetic field. The powder is arranged in a regular manner under the action of the magnetic field. At this time, the upper and lower pressure heads of the mold start to press against each other. The pole heads on both sides apply a small current reverse magnetic field to demagnetize the magnetized blank. At present, the orientation method of sintered NdFeB powder is mostly one-time orientation, that is, the current of the pole head is directly added...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/00
Inventor 彭磊王永东任明伟
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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