Production method of NdFeB (Neodymium Iron Boron) radiation ring

Abstract

The invention discloses a production method of a NdFeB (Neodymium Iron Boron) radiation ring. The NdFeB radiation ring is produced by a radiation ring forming device. The production method comprises the steps of spreading magnetic powder in a gap between a female die outer sleeve and a mandrel, driving a transmission main shaft, a female die inner sleeve and the female die outer sleeve to rotate by a chain wheel mechanism to magnetize, pressing the mandrel through an upper pressing head after the completion of the magnetizing of the magnetic powder, moving the mandrel along a slot downwards, forming a magnetic ring, and then stopping rotating, taking out the upper pressing head to leave away from a cavity, and finally taking out the magnetic ring in the cavity under an ejection function of a hydraulic lifting cylinder. According to the production method of the NdFeB radiation ring provided by the invention, the magnetic energy product, the product consistency and square degree requirement of the radiation rings of different specifications can be ensured, the product percent of pass of the radiation rings can be greatly improved as well; meanwhile, the production efficiency can be greatly improved.

Description

technical field [0001] The invention relates to a production method of an NdFeB radiation ring. Background technique [0002] At present, the following schemes are adopted in the production of radiation rings in the NdFeB industry: [0003] 1) DC magnetic field with special magnetic circuit [0004] That is, when forming, the magnetic powder is always under the action of the magnetic field, and the orientation will not be destroyed during the pressing process. [0005] 2) Docking method of pulsed magnetic field magnetizing coil [0006] That is, when forming, the magnetic field lines generated by the two coils are repelled and aligned, and the magnetic field at the edge of the coil is used to generate a radiation field. [0007] 3) Forming by hand-drawn molding machine [0008] That is, the upper and lower poles of the hand-drawn molding machine are used to both suppress and magnetize. [0009] The objective disadvantages of the prior art: the first method is not eas...

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Problems solved by technology

[0009] The objective disadvantages of the existing technology: the first method is not easy to generate a large radiation field, the degree of orientation is not high, and the generated radiation field has a large relationship with the size of the magnetic ring

Although the second method has a larger radiation field, it is beneficial to improve the degree of orientation, but the magnetic powder is not always under the action of the magnetic field, and the orientation arrangement is destroyed during pressing, resulting in poor squareness of the characteristic curve. In addition, it is inconvenient to disassemble the magnetic ring. Low production efficiency and low product qualification rate

The third method is the same as the first method, the radiation field generated has a great relationship with the size of the magnetic ring, and the magnetic energy product of products with a large size cannot meet the requirements

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