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Method for chamfering permanent magnet material

A technology of permanent magnet material and chamfering, which is applied in the field of pretreatment to achieve the effect of preventing tip effect, uniform current distribution and avoiding corner drop

Active Publication Date: 2012-09-19
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of this invention is to provide a chamfering method and testing method for permanent magnet materials, which can not only solve the problem of surface treatment, but also ensure that the magnetic properties of permanent magnets are in the best condition according to subsequent processing

Method used

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  • Method for chamfering permanent magnet material
  • Method for chamfering permanent magnet material
  • Method for chamfering permanent magnet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Grind 2.3 kg of NdFeB permanent magnet material of D2.5*1.5mm (ie diameter*thickness) in a vibrating mill for 1 hour, and then test the chamfering angle of the permanent magnet by the aforementioned method, and according to the test results , adjust the vibration grinding time, so that the chamfering angle is controlled at 0.10 ~ 0.25mm.

[0029] In order to verify the influence of the chamfering treatment on the subsequent anti-corrosion process, the chamfered (or polished) NdFeB permanent magnet material in this example was electroplated with multiple layers of nickel, and the results showed that the nickel layer did not bubble. This shows that the chamfering treatment is beneficial to the uniform distribution of the electroplating layer.

[0030] However, comparative experiments show (see Comparative Example 1 below), in the electroplating of multi-layer nickel for NdFeB permanent magnet materials, if the chamfer angle is less than 0.10mm, the phenomenon of coating b...

Embodiment 2

[0032] Polish 2.5 kg of NdFeB permanent magnet material of D10*2mm (ie diameter*thickness) according to the method of vibrating and rolling, and control the chamfering angle within 0.15-0.45mm.

[0033] Then, the surface of the chamfered (or polished) NdFeB permanent magnet material in this example is plated with multiple layers of nickel, and the results show that the nickel layer does not bubble, and the appearance and salt spray meet the requirements.

Embodiment 3

[0035] Polish 2.5 kg of NdFeB permanent magnet material of D10*D8*2mm (ie outer diameter*inner diameter*thickness) according to the method of vibrating and rolling, and control the chamfering angle within 0.15-0.30mm.

[0036] Then, the surface of the chamfered (or polished) NdFeB permanent magnet material in this embodiment is plated with multiple layers of nickel, and the results show that the nickel layer does not bubble, and the appearance and salt spray meet the requirements.

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Abstract

The invention provides a method for chamfering permanent magnet material. In the step of chamfering the permanent magnet material, the chamfer angle of the permanent magnet material is controlled between 0.01 mm and 0.75 mm according to different surface processing methods. Due to the adoption of the method for chamfering the permanent magnet material, the point effect can be effectively avoided,the current and the electroplating layer can be distributed uniformly, the mechanical defects that the surface of the permanent magnet workpiece has burrs and is rough and uneven are overcome, the permanent magnet workpiece oxide scale can be loosened, the permanent magnet workpiece can be washed with acid in the subsequent corrosion preventing process, the permanent magnet workpiece can not be collided to be subjected to the arris defect in the postprocessing process, the status of the surface of the permanent magnet workpiece can be enhanced and the surface processing effect of the permanent magnet workpiece can be improved.

Description

technical field [0001] The invention relates to a method for chamfering permanent magnet materials, belonging to the field of chemical surface treatment of materials, and more particularly, to a pretreatment technology used in the surface treatment method for permanent magnet materials. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials have been very rapid, and the surface protection technology of NdFeB permanent magnet materials is one of the key technologies that determines whether the material can be popularized and applied. NdFeB permanent magnet materials are mainly prepared from elements such as rare earth metal neodymium (Nd), iron and boron by powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobile and many other fields, and the application prospect is very broad. [0003] The premise of the ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B9/02G01B11/26
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH