Miniature bonding permanent magnet and production method thereof

A bonded permanent magnet, miniature technology, applied in permanent magnets, inductance/transformer/magnet manufacturing, electrical components, etc. Magnet dimensional accuracy and other issues, to achieve the effect of size reduction, easy demolding, and improved corrosion resistance

Inactive Publication Date: 2012-05-23
湖南航天稀土磁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the existing methods for preparing miniature bonded permanent magnets is the injection molding method. In this injection molding method, the filling amount of the binder reaches more than 15wt%, resulting in low magnetic properties of the magnet, and its maximum magnetic energy product (BH)max is only There are 48~72kJ / m3, and the sprue opening needs to be left during injection, which affects the dimensional accuracy of the magnet; there is also a molding method, which is usually used for molding microporous powder metallurgy products with a pore diameter of ≤1.2mm. In the secondary processing, its dimensional accuracy, concentricity and consistency are difficult to guarantee. The powder is easily adhered to the inner hole of the forming die in the first stamping. The size of the miniature bonded permanent magnets prepared by the molding method is relatively large, and the precision is not high
Existing anti-corrosion coating on the surface of the magnet is to use spraying or electrophoresis method, the spraying method is more troublesome, and the electrophoresis method will cause the inner hole of the cylinder to be blocked, so the miniature bonded permanent magnet prepared by the existing method cannot meet the needs of digital cameras / camcorders. Requirements for bonded permanent magnets used in precision micro motors such as shutter motors and automatic zoom motors

Method used

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  • Miniature bonding permanent magnet and production method thereof
  • Miniature bonding permanent magnet and production method thereof
  • Miniature bonding permanent magnet and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Magnet for digital camera shutter motor

[0021] With reference to accompanying drawing: the shape that the magnet requirement of the digital camera shutter motor of the present embodiment is cylindrical, it is made of cylindrical magnet compact 1 and the anticorrosion coating 2 on the outside of magnet compact, and cylindrical hollow tube The inner diameter d of the cylinder is Φ0.4mm, the outer diameter D of the cylinder is Φ2.1mm, the height H is 2.5mm, and the maximum magnetic energy product (BH)max is 192~200kJ / m 3 .

[0022] The raw material of the magnetic powder is MQA-38-14 anisotropic NdFeB magnetic powder, the binder is CYD-010 epoxy resin, the antioxidant is phenolic 1010 antioxidant, and the lubricant is molybdenum disulfide.

[0023] The preparation method is:

[0024] (1) According to the ingredients of magnetic powder 97.4wt%, binder 2.1wt%, antioxidant 0.2wt%, lubricant 0.3wt%, and mix the above four components evenly;

[0025] (2) Put the...

Embodiment 2

[0030] Example 2: Magnet for automatic zoom motor of digital video camera

[0031] The raw material of the magnetic powder is MQP-B+ isotropic NdFeB magnetic powder, the binder is 2402# phenolic resin, the antioxidant is dilauryl thiodipropionate, and the lubricant is zinc stearate.

[0032] The preparation method is:

[0033] (1) According to the ingredients of magnetic powder 96.8wt%, binder 2.4wt%, antioxidant 0.6wt%, lubricant 0.2wt%, and mix the above four components evenly;

[0034] (2) Put the mixture into the mold of the cylindrical magnet compact. The mold in this embodiment is a cemented carbide mold. The specifications of the selected mold are to control the outer diameter D of the green compact to Φ3.5mm, and the inner diameter d is Φ0.9mm, height H is 6.2mm, molded under the pressure of 1000MPa to make green compact 1, the precision of the forming mold is ≤0.1μm, the positioning accuracy of the mold is ≤0.2μm, and the vibration frequency of the mandrel when filli...

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Abstract

The invention relates to a miniature bonding permanent magnet and a production method thereof. The miniature bonding permanent magnet is a cylinder formed by a one-step formed cylindrical magnetic compact and an anticorrosion coating on the surface of the magnetic compact, wherein the cylindrical inner diameter of the cylindrical magnetic compact is 0.2-1.2 mm, the cylindrical outer diameter is 0.8-3.8 mm, and the height is 0.3-10 mm; and the thickness of the anticorrosion coating is 0.1-25 mum. The maximum magnetic energy product (BH) max of the miniature bonding permanent magnet can reach 76-216 kJ / m<3>. Compared with the traditional miniature bonding permanent magnet, the magnetic property of the miniature bonding permanent magnet is greatly improved, the size of the miniature bonding permanent magnet is greatly reduced, and the precision of the miniature bonding permanent magnet is further higher than that of the present magnet. The experiments shows that the miniature bonding permanent magnet can meet the newest requirements of lightness and thinness of digital cameras and video cameras.

Description

technical field [0001] The invention relates to a miniature bonded permanent magnet and a preparation method thereof. In particular, it relates to a bonded permanent magnet used in precision micro motors such as shutter motors and automatic zoom motors of digital cameras / video cameras and a preparation method thereof. Background technique [0002] With the light and thin development of certain terminal products such as digital cameras / video cameras, the requirements for the magnetic performance and precision of micro-magnets are getting higher and higher, and the requirements for the size of micro-magnets are getting smaller and smaller. One of the existing methods for preparing miniature bonded permanent magnets is the injection molding method. In this injection molding method, the filling amount of the binder reaches more than 15wt%, resulting in low magnetic properties of the magnet, and its maximum magnetic energy product (BH)max is only There are 48~72kJ / m3, and the sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/02H01F41/02B22F3/02
Inventor 秦国超李平向芳
Owner 湖南航天稀土磁有限责任公司
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