High-speed press forming method for anisotropic binder-free neodymium iron boron magnet

A high-speed pressing and anisotropic technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of permanent magnet material forming that have not been reported, and achieve good practicability, simple process and low cost Effect

Active Publication Date: 2012-05-09
GUANGDONG YUEHAI HUAJIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been many advances in the research of high-speed pressing technology at home and abroad, but this technology is mainly used in the forming of steel-based, titanium-based, copper-based and other structural materials, and there is no report on the forming of permanent magnetic materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high-speed compression forming method for anisotropic binder-free NdFeB magnets can use commercially available anisotropic NdFeB powders, preferably with a particle size of <200μm, and the forming steps and process conditions are as follows:

[0021] (1) Use lithium stearate alcohol suspension as the mold wall lubricant to lubricate the inner wall of the mold cavity;

[0022] (2) Fill the mold cavity with anisotropic neodymium iron boron magnetic powder, and place the mold with the above magnetic powder on the orientation table of a pulse magnetic field orientation machine model NS3000 for orientation. The magnetic field strength is 1.0T and the frequency is 0.1 Hz; YAW4106 hydraulic press is used for pre-compression at the same time of orientation, the pre-compression pressure is 20MPa, and the pressure-holding time is 20s;

[0023] (3) After heating the mold to 130°C, use a warm powder high-speed compaction forming device disclosed in Chinese Patent No. 201020027160.2 to p...

Embodiment 2

[0026] An anisotropic binderless neodymium iron boron magnet high-speed compression molding method can use commercially available anisotropic neodymium iron boron powder, preferably with a particle size of less than 200 μm. The forming steps and process conditions are as follows:

[0027] (1) Use lithium stearate alcohol suspension as the mold wall lubricant to lubricate the inner wall of the mold cavity;

[0028] (2) Fill the anisotropic neodymium iron boron magnetic powder into the mold cavity, and then place the mold containing the above magnetic powder on the orientation table of the NS3000 pulse magnetic field orientation machine for orientation. The magnetic field strength is 1.5T and the frequency is 0.02 Hz, and YAW4106 hydraulic press is used for pre-compression while oriented; the pre-compression pressure is 30 MPa, and the pressure-holding time is 20 s;

[0029] (3) After heating the mold to 150°C, use a warm powder high-speed compaction device disclosed in Chinese Patent...

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Abstract

The invention discloses a high-speed press forming method for an anisotropic binder-free neodymium iron boron magnet. The method comprises the following steps and the following process conditions of: (1) lubricating a mold wall; (2) filling magnetic powder in a mold cavity, then placing the mold cavity into a pulsed magnetic field with magnetic field intensity of 1.0 to 1.5 T and frequency of 0.02 to 0.1 Hz to perform orientation, and applying a pressure of 20 to 30 MPa to prepress at the same time; and (3) heating the mold to 130 to 150 DEG C and then performing press forming at the high speed of 10 to 17 m / s. The method has the advantages of realizing low-cost short-process near-net shape forming, along with simple process, high practicability and low cost. Compared with the neodymium iron boron magnet, the produced neodymium iron boron magnet has the advantages that the green body density is increased by 0.43 to 0.93 g / cm<3>, the remanence is increased by 0.2 to 0.54 T, the maximummagnetic energy product is increased by 20 to 60 kJ / m<3>, the coercive force Hcb is increased by 73 to 348 kA / m and Hci is increased by 80 to 387 kA / m.

Description

Technical field [0001] The invention relates to the field of powder metallurgy, in particular to a high-speed compression forming method of an anisotropic binderless neodymium iron boron magnet. Background technique [0002] The degree of production, development and application of permanent magnet materials is one of the signs of the degree of economic development in modern countries. Rare earth permanent magnet materials represented by neodymium iron boron are a new generation of permanent magnet materials with the highest magnetic performance, the widest application and the fastest development speed. The neodymium iron boron permanent magnet material, known as the "magnet king", has very high saturation magnetization, anisotropy and coercivity. It is widely used in electronic information, electromechanical, instrumentation and household appliances and other fields, and has become the foundation of high technology material. At present, there are two main forms of forming NdFeB...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/02B22F3/03H01F1/057H01F1/06
Inventor 肖志瑜陈进秦志刚吴苑标李元元
Owner GUANGDONG YUEHAI HUAJIN TECH CO LTD
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