Preparation method of small complex magnetic shielding parts

A technology of magnetic shielding and parts, applied in the field of metal injection molding, can solve the problems of difficult machining, low hardness, long production cycle, etc. Effect

Inactive Publication Date: 2011-11-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Some magnetic shielding materials such as pure iron and permalloy have low hardness, and are easy to stick to the knife during machining, making machining difficult;
[0004] (2) The raw materials of magnetic shielding parts prepared by traditional machining are wasteful, the manufacturing cost is high, and the production cycle is long, resulting in low production efficiency;
However, due to the addition of a large amount of binder in the MIM method, it is easy to increase the carbon and oxygen content during the degreasing process.
Decrease the performance of MIM soft magnetic alloy

Method used

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  • Preparation method of small complex magnetic shielding parts

Examples

Experimental program
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Effect test

example 1

[0033] Pure iron powder is selected, and polyethylene-paraffin-vegetable oil binder system is adopted. The formula is to take 40% polyethylene, 50% paraffin, and 10% vegetable oil by weight percentage; the volume ratio of feeding binder and raw material powder is 45%. :55 ratio. After the binder and the raw material powder are evenly mixed, the feed is granulated with a granulator; after the feed is granulated, it is injected on an injection molding machine at an injection temperature of 130°C, an injection pressure of 70 MPa, and an injection speed of 40 g / s. At a temperature of 40°C, it is processed into a blank to obtain a defect-free injection green body of the desired shape. The binder in the forming blank is removed by two-step degreasing method. Firstly, the blank is placed in methylene chloride to dissolve the paraffin and vegetable oil components; 3h, then heated to 800°C at a rate of 5°C / min for thermal degreasing and heat preservation for 12h; sintering was carried...

example 2

[0035]If the component is used in a weak magnetic field and requires a high magnetic shielding effect, the Fe-78%Ni permalloy with high magnetic permeability is selected. Prepare Fe-78%Ni mixed powder according to Fe:Ni mass fraction ratio of 22:78, and make uniform raw material mixed powder after ball milling for 8 hours. A polyethylene-paraffin-vegetable oil binder system is adopted, the formula of which is 20% polyethylene, 20% paraffin, and 60% vegetable oil by weight; the feed binder and raw material powder are mixed in a volume ratio of 35:65. After the binder and the raw material powder are evenly mixed, the feed is granulated with a granulator; after the feed is granulated, injection molding is performed on an injection molding machine at an injection temperature of 170°C, an injection pressure of 110 MPa, and an injection speed of 70 g / s. At a temperature of 70°C, it is processed into a blank, and a defect-free injection green body of the desired shape is obtained. T...

example 3

[0037] If the part is used in a strong magnetic field, a high-flux Fe-50% Ni permalloy is selected. Prepare Fe-50%Ni mixed powder according to Fe:Ni mass fraction ratio 50:50, and make uniform raw material mixed powder after ball milling for 8 hours. A polyethylene-paraffin-vegetable oil binder system is adopted, and the formula is as follows: 25% polyethylene, 25% paraffin, and 50% vegetable oil; the feed binder and raw material powder are mixed in a volume ratio of 45:55. After the binder and the raw material powder are evenly mixed, the feed is granulated with a granulator; after the feed is granulated, injection molding is performed on an injection molding machine at an injection temperature of 135°C, an injection pressure of 85 MPa, and an injection speed of 55 g / s. At a temperature of 50°C, it is processed into a blank to obtain a defect-free injection green body of the desired shape. The binder in the forming blank is removed by two-step degreasing method. Firstly, the...

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Abstract

The invention discloses a preparation method of small complex magnetic shielding parts, belonging to the technical field of injection molding. The preparation method comprises the steps of: mixing high-purity pure iron powder or Fe-Ni permalloy powder with a binder and granulating to obtain uniform feed; adopting a powder injection molding process to obtain formed blanks, degreasing by matching with a two step approach, introducing hydrogen for sintering, relieving the residual stress of the sintered sample by heat treatment with introduced hydrogen, thereby realizing the one-time forming of the magnetic shielding parts with complex structure. The preparation method of the small complex magnetic shielding parts is simple, convenient to operate, can realize the one-time forming of the magnetic shielding parts with complex structure by use of the injection molding process, and breaks through the limitation of the traditional processing technology on the design of appearances and structures of the magnetic shielding parts. The content of impurities in the pure iron or permalloy can be effectively reduced and the magnetic property of the pure iron or permalloy can be improved by controlling the content of the impurities in the pure iron or permalloy and matching with degreasing by using the two step approach and sintering with introduced hydrogen. The preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing small and complex magnetic shielding parts, and belongs to the technical field of metal injection molding preparation. Background technique [0002] With the rapid development of the modern electronics industry, electronic components are developing in the direction of miniaturization and complexity, and higher and higher requirements are placed on the shape and size of magnetic shielding parts, and their sizes are getting smaller and smaller (as small as several mm), with increasingly complex shapes and structures (such as figure 1 The magnetic shielding components shown include complex structures such as convex hulls and air holes). The application range of magnetic shielding parts prepared by traditional machining methods is greatly limited, mainly in the following areas: [0003] (1) Some magnetic shielding materials such as pure iron and permalloy have low hardness, and are easy to stick to the knif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16
Inventor 李益民何浩熊亮
Owner CENT SOUTH UNIV
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