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Machining method of neodymium-iron-boron permanent magnet

A processing method and permanent magnet technology, applied in the field of permanent magnets, can solve the problems of insufficient corrosion resistance, poor thickness distribution uniformity, and high porosity, and achieve excellent and durable corrosion resistance, high cutting efficiency, and low porosity. Effect

Active Publication Date: 2016-02-17
DONGGUAN JINCONN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the nickel-plated or zinc-plated layers of existing NdFeB magnets generally have the defects of poor thickness distribution uniformity, high porosity, and insufficient corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A processing method for NdFeB permanent magnets, comprising the following steps: A, preparing materials, preparing cylindrical raw materials; B, stacking, stacking and bonding the raw materials prepared in step A on an asbestos board to obtain a bonding material block; C, cutting, first cut off the end edge material of the cohesive block obtained in step B, and then cut off a piece of semi-finished material block and surplus material block according to the product size requirements; D, boil and loosen, step C is obtained The semi-finished material blocks are placed in the boiling liquid with additives for decoction treatment, the semi-finished material blocks are boiled and dispersed to obtain thick magnet blocks; E, size control and chamfering treatment, the thick magnet blocks obtained in step D are placed Carry out grinding treatment in the grinder, and then chamfer the thick magnet block; F, electroplating and magnetization, carry out electroplating treatment to the ...

Embodiment 2

[0036] The difference between this embodiment and embodiment 1 is:

[0037] The additive in the step D is a mixture of NaCl and caustic soda in a mass ratio of 2:2, and the water temperature is 60°C.

[0038] The dimensional accuracy of the polished product in the step E is controlled within ±0.03 mm.

[0039] The plating bath that the electrogalvanizing process in the described step F adopts consists of zinc sulfate 38g / L, boric acid 20g / L, sodium dodecylbenzenesulfonate 45g / L, potassium phosphate 130g / L, ammonium chloride 28g / L , the balance is water, the electroplating temperature is 43°C, the electroplating time is 43min, and the current density is 12mA / cm 2 , pH is 5, the thickness of the zinc coating is 8μm.

[0040] The plating solution that the electroplating nickel process in the described step F adopts consists of nickel sulfate 200g / L, boric acid 35g / L, n-octyl sodium sulfate 1.2g / L, nano silicon dioxide 0.6g / L, dipotassium hydrogen phosphate 35g / L, diammonium h...

Embodiment 3

[0042] The difference between this embodiment and embodiment 1 is:

[0043] The additive in the step D is a mixture of NaCl and caustic soda in a mass ratio of 2:3, and the water temperature is 80°C.

[0044] The dimensional accuracy of the polished product in the step E is controlled within ±0.03 mm.

[0045] The plating bath that the electrogalvanizing process in the described step F adopts consists of zinc sulfate 40g / L, boric acid 22g / L, sodium dodecylbenzenesulfonate 50g / L, potassium phosphate 150g / L, ammonium chloride 30g / L , the balance is water, the electroplating temperature is 45°C, the electroplating time is 45min, and the current density is 15mA / cm 2 , pH is 5.5, the thickness of the zinc coating is 10μm.

[0046] The plating solution that the electroplating nickel process in the described step F adopts consists of nickel sulfate 250g / L, boric acid 40g / L, n-octyl sodium sulfate 1.5g / L, nano silicon dioxide 1g / L, dipotassium hydrogen phosphate 40g / L L, diammonium...

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Abstract

The invention relates to the technical field of permanent magnets and particularly relates to a machining method of a neodymium-iron-boron permanent magnet. The machining method comprises the following steps: A, preparing materials; B, stacking: stacking and binding the raw materials prepared by the step A into an asbestos board to obtain a bound material block; C, cutting: cutting off end part marginal materials of the bound material block obtained by the step B in one step and cutting according to product size requirements to obtain a semi-finished-product material block and a residual material block; D, boiling into powder: putting the semi-finished-product material block obtained by the step C into a boiling solution added with an additive to be boiled into powder, boiling the semi-finished-product material block into powder and dispersing to obtain a rough magnet block; E, controlling the size and carrying out chamfering treatment: putting the rough magnet block obtained by the step D into a polishing machine to be polished; and F, electroplating and magnetizing: carrying out electroplating treatment on the rough magnet block obtained by the step E and carrying out magnetizing treatment on the rough magnet block after the electroplating treatment is finished to obtain a finished-product magnet. The machining method has a simple preparation process, high production efficiency and excellent and lasting corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of permanent magnets, in particular to a processing method for NdFeB permanent magnets. Background technique [0002] Magnetic synthetic material (product) is a new type of polymer functional material developed in the past two years, and it is one of the important basic materials (products) in the field of modern science and technology. Magnetic synthetic materials are divided into two types: structural type and composite type. Among them, composite magnetic synthetic materials are divided into two categories, thermoplastic and thermosetting. Thermoplastic magnetic synthetic materials can be divided into two categories according to the processing method, one is based on chlorinated polyethylene or nitrile rubber, etc., and the magnetic rubber is formed by rubber processing technology; the other is made of nylon, polyphenylene sulfide, etc. Injection (extrusion) magnets for substrates. [0003] NdFeB stron...

Claims

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Application Information

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IPC IPC(8): H01F41/02C25D3/12C25D3/22H01F1/057
CPCC25D3/12C25D3/22H01F1/057H01F41/026
Inventor 陈亮
Owner DONGGUAN JINCONN NEW MATERIAL CO LTD
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