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Method for manufacturing magnetic encoder

A manufacturing method and technology of a magnetic encoder, which are applied in the manufacture of inductors/transformers/magnets, instruments, magnets, etc., can solve the problems of reducing the coercivity of magnetic rubber molded products, etc.

Active Publication Date: 2017-02-22
UCHIYAMA MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been found that when a high-viscosity magnetic rubber composition containing a large amount of ferrite magnetic powder is kneaded for a long time, the contained ferrite magnetic powder is subjected to intense shearing force for a long time. The coercive force of the magnetic rubber molded product is greatly reduced

Method used

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  • Method for manufacturing magnetic encoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] [Production of unvulcanized rubber sheet]

[0046] The raw materials shown below were kneaded for 35 minutes while maintaining the temperature of the composition at 60 to 100° C. using an 8-inch-diameter open roll to produce unvulcanized rubber sheets with a thickness of 1 mm, 1.5 mm, and 2 mm.

[0047] ・Nitrile rubber (non-hydrogenated: NBR): 100 parts by mass

[0048] Acrylonitrile content 34%, Mooney viscosity (ML 1+10 , 100°C) 45

[0049] ・Strontium ferrite magnetic powder A (for magnetic field orientation): 1100 parts by mass

[0050] Average particle diameter 1.2 μm (There are many peaks in the particle size distribution.)

[0051] Compressed density 3.6g / cm 3

[0052] The residual magnetic flux density of the compressed body is 196mT

[0053] The coercive force of the compressed body is 236kA / m

[0054] Plasticizer TOTM [tris(2-ethylhexyl trimellitate)]: 3 parts by mass

[0055] Zinc oxide: 4 parts by mass

[0056] Stearic acid: 3 parts by mass

[0057]...

Embodiment 2

[0073] In Example 1, except having used strontium ferrite magnetic powder B instead of strontium ferrite magnetic powder A, it carried out similarly to Example 1, and produced the unvulcanized rubber sheet. The characteristics of the strontium ferrite magnetic powder B are as follows. Using the obtained unvulcanized rubber sheet, the vulcanization characteristics, magnetic characteristics, and adhesiveness to the supporting member were measured in the same manner as in Example 1. The results are summarized in Table 1.

[0074] Average particle diameter 1.14 μm (There is a peak in the particle size distribution.)

[0075] Compressed density 3.5g / cm 3

[0076] The residual magnetic flux density of the compressed body is 185mT

[0077] The holding force of the compressed body is 273kA / m

Embodiment 3

[0079] In Example 1, hydrogenated nitrile rubber (HNBR) was used instead of nitrile rubber (NBR), and the blending amount of stearic acid was 2 parts by mass, and the blending amount of sulfur was 0.5 parts by mass. In addition, an unvulcanized rubber sheet was produced in the same manner as in Example 1. The properties of the hydrogenated nitrile rubber used here are as follows. Using the obtained unvulcanized rubber sheet, the vulcanization characteristics, magnetic characteristics, and adhesiveness to the supporting member were measured in the same manner as in Example 1. The results are summarized in Table 1.

[0080] Acrylonitrile content 36%

[0081] Mooney viscosity (ML 1+10 , 100°C) 57

[0082] Iodine value 28g / 100g

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Abstract

A method for manufacturing a magnetic encoder provided with a magnetic body comprising a magnetic rubber molded article, the method characterized by having a mixing step for obtaining a magnetic rubber mixture by mixing and then kneading nitrile rubber (A), ferrite magnetic powder, and a vulcanizing agent (C), and a molding step for molding the magnetic rubber composition in a mold to which a magnetic field is applied, vulcanizing the magnetic rubber composition, and obtaining a magnetic rubber molded article, the content of the ferrite magnetic powder (B) being 700-1500 parts by mass with respect to 100 parts by mass of the nitrile rubber (A), and the pressed density of the ferrite magnetic powder (B) being at least 3.5 g / cm3. Through this method, a magnetic encoder can be manufactured that is provided with a magnetic body having high coercivity and residual magnetic flux density by vulcanization of a magnetic rubber composition having favorable molding properties.

Description

technical field [0001] The present invention relates to a method of manufacturing a magnetic encoder including a magnetic body composed of a magnetic rubber molded article obtained by vulcanizing a magnetic rubber composition containing nitrile rubber and ferrite magnetic powder. Background technique [0002] Magnetic rubber molded articles obtained by vulcanizing a magnetic rubber composition containing rubber and magnetic powder are used in various applications. Among them, one of suitable uses of the magnetic rubber molded article is a magnetic encoder, which is manufactured by magnetizing the magnetic rubber molded article. At this time, various rubbers are used according to the required performance of the product, but nitrile rubber is preferably used in view of the balance between oil resistance, heat resistance, and price. In addition, as the magnetic powder, ferrite magnetic powder, rare earth magnetic powder, etc. are used according to the required performance, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/245H01F1/113H01F7/02
CPCG01D5/245H01F1/117H01F7/0215H01F41/0273G01D2205/80B29C35/02B29C45/0001B29K2019/00B29K2105/16B29K2509/00B29K2995/0008G01D5/14
Inventor 坂手和志笠本忠志片山龙雄
Owner UCHIYAMA MFG
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