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Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming

An anisotropic, dry press forming technology, applied in the manufacture of inductors/transformers/magnets, manufacturing stator/rotor bodies, magnetic materials, etc., can solve problems such as low yield, cracking, inconsistent shrinkage of upper and lower end surfaces, etc.

Active Publication Date: 2009-12-09
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the height-to-diameter ratio of the general radial multi-pole magnetic ring is much larger, the upper and lower end faces shrink inconsistently during sintering during pressing, resulting in cracking and extremely low yield.

Method used

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  • Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming
  • Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming
  • Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The base material adopts the formula in the patent application number 200510023312.5 (magnet powder, sintered magnet manufacturing method and its products), and the pre-sintered material includes a hexagonal ferrite main phase containing A, R, B and Fe, and has the following characteristics Molecular formula: A 1～ x R x [(Fe 3+ a Fe 2+ b ) 12～y B y ] z o 19 , where A represents one or two elements of Sr and Ba; R represents at least one element selected from rare earth elements and Bi, and must contain La; B represents Co, Ti, Mn, Zn, Ge, As and at least one element in W, which must contain Co, and the valence of the Co element is positive trivalent; wherein, a+b is equal to 1; z is preferably 0.9 to 1.1; a is preferably 0.97 to 0.999, and b is preferably 0.001 to 0.03 ; The preferred ranges of x and y are: 0≤x≤0.54, 0.≤y≤0.45.

[0023] The specific process of dry pressing anisotropic multi-pole magnetic ring is as follows:

[0024] 1. Ball milling process ...

Embodiment 2

[0035] The specific process of dry pressing anisotropic multi-pole magnetic ring is as follows:

[0036] 3. Pre-compression pre-magnetization granulation process

[0037] First, the dried powder is mixed with the binder methylcellulose solution, the binder ratio is 40wt%, then magnetized in a magnetic field, then dried, and finally the powder is pulverized by a high-speed pulverizer, and passed A 60-mesh sieve was used to obtain dry-pressed permanent magnet ferrite radial molding powder. The pre-compression pressure is 10Mpa, and the pre-magnetization magnetic field is 5000Oe.

[0038] 4. Radial forming process

[0039] The permanent magnet ferrite radial multi-pole magnetic ring is formed on a 45T experimental press, the pressure is 3MPa, the water content of the dry-pressed magnetic powder before forming is 0.2wt%, and the forming radial magnetic field is 10000Oe. It is pressed and formed by double-sided isostatic pressing.

[0040] All the other are identical with embod...

Embodiment 3

[0042] The specific process of dry pressing anisotropic multi-pole magnetic ring is as follows:

[0043] 3. Pre-compression pre-magnetization granulation process

[0044] First, the dried powder is mixed with a binder methylcellulose solution, the binder ratio is 40wt%, and then magnetized in a magnetic field with a pre-compression pressure of 25Mpa and a pre-magnetization magnetic field of 6500Oe. Then dry again, and finally pulverize the powder with a high-speed pulverizer and pass through a 60-mesh sieve to obtain the powder for radial molding of dry-pressed permanent magnet ferrite. After drying, pre-compression and pre-magnetization are carried out, the pre-compression pressure is 25Mpa, and the pre-magnetization magnetic field is 6500Oe.

[0045] 4. Radial forming process

[0046] The permanent magnet ferrite radial multi-pole magnetic ring is formed on a 45T experimental press, the pressure is 3MPa, the water content of the dry-pressed magnetic powder before forming i...

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Abstract

The invention relates to the field of magnetic materials, in particular to a method for manufacturing an anisotropic multi-pole magnetic ring through dry-press forming. Aiming at the problem that the multi-pole magnetic ring manufactured by the prior art through the dry-press forming is easy to crack, has low yield and the like, the invention provides the method for manufacturing the anisotropic multi-pole magnetic ring through the dry-press forming, and for the multi-pole magnetic ring manufactured by the method, the surface magnetism is more than 1,500 Gs, the Br is more than 3,600 Gs, and the Hcb is more than 3,000 Oe. The aim of the invention is achieved through the following technical proposal: performing wet method pulverization on magnetic powder; adding more than one binding agent and lubricating agent into the magnetic powder which is dried; then performing prepressing and pre-magnetization on the mixture, and then performing a mixing process for mixing the mixture by using a high-speed disintegrator; performing a double-sided equal pressure forming process on the powder in a radial magnetic field; and performing a sintering process for sintering the formed sample, wherein the magnetic powder contains a pre-sintering material and an additive.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for manufacturing an anisotropic multi-pole magnetic ring by dry pressing. Background technique [0002] A multi-pole magnetic ring is a common name for a rotor with two or more poles. Anisotropic permanent magnet ferrite multi-pole magnetic rings are widely used in variable frequency air conditioner motors, mahjong machines, washing machines, oil pump motors, servo motors and stepping motors. figure 1 Shown is the outer circle multi-pole anisotropic permanent ferrite multi-pole magnetic ring, figure 2 It is an inner circle multi-pole anisotropic permanent ferrite multi-pole magnetic ring. At present, there are two main methods of manufacturing anisotropic permanent ferrite multi-pole magnetic rings. One is the traditional wet forming process, that is, the axial orientation forming process, which uses pressed square ferrite. Magnetic blocks, and then cutting and hol...

Claims

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Application Information

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IPC IPC(8): H01F1/113H01F41/02H02K15/02B22F3/16C09J129/04C09J171/08C09J191/06C09J101/08
Inventor 丁伯明包大新郭小芳张伟高石法明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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