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Method for improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material

A rare earth permanent magnet and grinding technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of insignificant improvement of grinding yield, insignificant sintering of rare earth permanent magnet materials, and inability to greatly reduce grinding cracks, etc. problem, achieve the effect of reducing production cost and improving yield

Active Publication Date: 2015-05-20
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of the above improvement is particularly insignificant for thin-walled ring-shaped sintered rare earth permanent magnet materials, and the occurrence of grinding cracking cannot be greatly reduced.
[0004] The grinding process mentioned in "Research on Grinding Process of Ferrite Magnetic Products" (Li Yang, Yin Hong, Gao Yi "Mining and Metallurgy", Volume 11, No. 02, 2002) affects the thin-walled NdFeB magnetic ring. The grinding effect is not ideal, and the improvement of the grinding yield is not significant

Method used

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  • Method for improving grinding finished product ratio of thin-walled annular rare earth permanent-magnet material

Examples

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Effect test

Embodiment 1

[0018] Carry out surface shot-peening treatment on the sintered NdFeB blank ring with a Mohs hardness of 6 and a particle size of 60 mesh emery abrasives. The surface shot-peening treatment lasts for 15 minutes, and the surface shot-peening treatment uses 0.2MPa compressed air as power; Then heat-treat the sintered NdFeB blank ring after surface shot blasting for 0.5 hours at a temperature of 80°C in air; finally, perform outer circle, inner circle and end grinding on the heat-treated sintered NdFeB magnetic ring to obtain a sintered NdFeB magnetic ring finished product. See Table 1.

Embodiment 2

[0020] Carry out surface shot-peening treatment on the sintered NdFeB blank ring with a Mohs hardness of 8 and a particle size of 180 mesh emery abrasives. The surface shot-peening treatment lasts for 60 minutes, and the surface shot-peening treatment uses 0.8MPa compressed air as power; Then heat-treat the sintered NdFeB blank ring after surface shot blasting for 3 hours at a temperature of 350°C in air; finally, perform outer circle, inner circle and end grinding on the heat-treated sintered NdFeB magnetic ring to obtain a sintered NdFeB magnetic ring finished product. See Table 1.

Embodiment 3

[0022] Carry out surface shot-peening treatment on the sintered NdFeB blank ring with a Mohs hardness of 7 and a particle size of 100 mesh emery abrasives. The surface shot-peening treatment lasts for 30 minutes, and the surface shot-peening treatment uses 0.5MPa compressed air as power; Then heat-treat the sintered NdFeB blank ring after surface shot peening at 200°C in air for 2 hours; finally, perform outer circle, inner circle and end grinding on the heat-treated sintered NdFeB magnetic ring to obtain a sintered NdFeB magnetic ring finished product. See Table 1.

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Abstract

The invention provides a method for improving the grinding finished product ratio of thin-walled annular rare earth permanent-magnet material. The method comprises the steps as follows: firstly, grinding material is utilized to perform the surface shot blast on rare earth permanent-magnet material blanks, the Mohs hardness of the grinding material ranges from 6 to 8, and the granularity of the grinding material ranges from 60 to 180 meshes; and secondly, the rare earth permanent-magnet material blanks that are processed through the surface shot blast are processed through heat treatment in air or inert gas under the temperature ranging from 80 to 350 DEG C. The method remarkably improves the grinding finished product ratio of the rare earth permanent-magnet material especially the thin-walled annular rare earth permanent-magnet material without changing the magnetic property of the rare earth permanent-magnet material.

Description

technical field [0001] The invention relates to a grinding method of a rare earth permanent magnet material, in particular to a grinding method of a thin-walled annular rare earth permanent magnet material. Background technique [0002] The grinding process plays a vital role in the dimensional accuracy, appearance and yield of rare earth permanent magnet materials. Because of the hardness and brittleness of sintered rare earth permanent magnet materials, especially thin-walled ring-shaped rare earth permanent magnet materials, the grinding yield has always been low. On the one hand, it is because the rare earth permanent magnet material blank deforms greatly after sintering, resulting in different sizes of machining allowances; permanent cracks, especially thin-walled annular rare earth permanent magnet material blanks. All of these will cause difficulties in the grinding process of the rare earth permanent magnet material blank, and affect the yield of the rare earth per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24C1/10C22F1/16H01F1/053
Inventor 陈国安饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH