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Forming die and method for preparing pressed billet of non-oriented neodymium iron boron cylindrical magnet

A molding die and cylindrical technology, which is applied in the field of molding dies for compacts, can solve problems such as inability to suppress oval compacts, and achieve the effect of simple structure and reasonable design

Active Publication Date: 2013-06-05
SHANXI HUIQIANG MAGNETIC MATERIAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing molding die cannot suppress the elliptical compact of a cylindrical magnet with a diameter below 10 mm, the present invention provides a molding die and method for preparing a compact of a non-oriented NdFeB cylindrical magnet

Method used

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  • Forming die and method for preparing pressed billet of non-oriented neodymium iron boron cylindrical magnet
  • Forming die and method for preparing pressed billet of non-oriented neodymium iron boron cylindrical magnet
  • Forming die and method for preparing pressed billet of non-oriented neodymium iron boron cylindrical magnet

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] Such as figure 1 , 2 , shown in 3, a kind of molding die that prepares the green compact of non-oriented NdFeB cylindrical magnet, comprises cavity, and described cavity is divided into upper cavity 1 and lower cavity 2, and described upper and lower cavity The contact surfaces of 1 and 2 are respectively formed with several parallel semi-elliptical grooves 7 that can be combined into an elliptical cavity. The cross-sectional size of the elliptical cavity is: long axis of the ellipse = magnet diameter ÷ (0.75 ~0.77), ellipse minor axis = magnet diameter ÷ (0.825 ~ 0.835), semi-elliptical groove 7 length = magnet length ÷ (0.75 ~ 0.76), the magnet refers to the final non-oriented NdFeB cylindrical magnet .

[0018] For example figure 1 As shown, the elliptical cavity is evenly divided along the long axis of the ellipse, and the cro...

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Abstract

The invention relates to preparation of neodymium iron boron cylindrical magnets, in particular to a forming die and a method for preparing a pressed billet of a non-oriented neodymium iron boron cylindrical magnet, and solves the problem that an existing forming die cannot press a pressed billet of a cylindrical magnet with the diameter smaller than 10mm. The forming die for preparing the pressed billet of the non-oriented neodymium iron boron cylindrical magnet comprises a cavity, the cavity includes an upper cavity and a lower cavity, a plurality of parallel half-elliptic grooves can be combined into an elliptic cavity and are correspondingly formed on the contact surfaces of the upper cavity and the lower cavity respectively, and the cross sectional dimension of the elliptic cavity includes: an elliptic long axis=the magnet diameter / (0.75-0.77), an elliptic short axis=the magnet diameter / (0.825-0.835), and the length of each half-elliptic groove=the magnet length / (0.75-0.76), wherein the magnet refers to the non-oriented neodymium iron boron cylindrical magnet finally manufactured. The forming die is reasonable in design and simple in structure.

Description

technical field [0001] The invention relates to the preparation of NdFeB cylindrical magnets, in particular to a molding die and method for preparing compacts of non-oriented NdFeB cylindrical magnets. Background technique [0002] NdFeB permanent magnet material is a metal bond compound Nd 2 Fe 14 B 1 Based on permanent magnet materials, NdFeB has extremely high magnetic energy product and coercive force. NdFeB permanent magnet materials have been widely used in modern industry and electronic technology, making instruments, motors, magnetic separation and magnetization equipment miniaturized, lightweight and thin. The existing NdFeB permanent magnet materials are manufactured using powder metallurgy process, and the process flow is as follows: batching - smelting - powder making - pressing - sintering and tempering - magnetic testing - grinding - cutting - electroplating - finished product. [0003] To prepare non-oriented NdFeB cylindrical magnets, it is necessary to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/03H01F41/02
Inventor 张利杨志超
Owner SHANXI HUIQIANG MAGNETIC MATERIAL MFG
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