Ferrite magnetic core blank body and preparation method thereof, and ferrite magnetic core and preparation method of ferrite magnetic core

Abstract

The invention discloses a ferrite magnetic core blank body and a preparation method thereof, a ferrite magnetic core and a preparation method of the ferrite magnetic core. The preparation method of the ferrite magnetic core blank body comprises the steps: (1) blending 70%-95% of a ferrite powder and 5%-30% of a binder, and thus obtaining a feedstock for injection molding, wherein the ferrite powder includes 60%-70% of iron oxide, 10%-20% of nickel oxide, 2%-10% of copper oxide and 15%-25% of zinc oxide, and the binder comprises 80%-90% of polyoxymethylene, 3%-6% of high-density polyethylene, 3%-6% of an ethylene-vinyl acetate copolymer, 2%-5% of paraffin, and 2%-5% of zinc stearate; and (2) carrying out injection molding with the feedstock, and thus forming the ferrite magnetic core blank body. The preparation method not only improves the consistency of the magnetic core, the feeding flexibility is good, during injection molding of the ferrite magnetic core blank body, the product and a back material are not broken, demoulding is easy, and a mold is not required to be often cleaned, so that full-automatic production can be realized, the labor cost is greatly reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of ferrite cores, in particular to a ferrite core body and a preparation method thereof, a ferrite core and a preparation method thereof. Background technique [0002] The production technology of the traditional magnetic core is mainly the dry pressing method. The dry pressing method has many advantages: such as high production efficiency, less labor, low scrap rate, short production cycle, high density and high strength of the produced products, and is suitable for mass industrial production. The disadvantages are that the shape of the molded product is relatively limited, the cost of the mold is high, the strength of the green body is low, the internal compactness of the green body is inconsistent, and the uniformity of the structure is relatively poor. And because the core column of the magnetic core is generally cylindrical, dry pressing generally cannot be completed at one time. It needs to be pressed into a sq...

AI Technical Summary

Problems solved by technology

The disadvantages are that the shape of the molded product is relatively limited, the cost of the mold is high, the strength of the green body is low, the internal compactness of the green body is inconsistent, and the uniformity of the structure is relatively poor, etc.

And because the core column of the magnetic core is generally cylindrical, dry pressing generally cannot be completed at one time. It needs to be pressed into a square column and then processed into a cylinder with a lathe, which not only increases the process, but also increases the production cost and time. Product consistency is also not guaranteed

[0003] In order to improve the product consistency of magnetic cores of different shapes (such as cylindrical, racetrack, oval, etc.), the inventor proposed a method for preparing ferrite magnetic cores in patent document ZL201210123721.2, to a certain extent Solved the problem of the cylindrical molding of the magnetic core, but the feed material for the preparation of the magnetic core is relatively brittle. When the feed material is used for injection molding, the product and the return material are easy to break, and it is easy to stick to the mold so that the mold needs to be cleaned frequently, so that in the preparation The magnetic core process requires manual operation and can only be produced semi-automatically, which reduces production efficiency and increases labor costs

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