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Flat and ultrathin manganese zinc ferrite magnetic core forming method

A technology of manganese-zinc ferrite and forming method is applied in the field of magnetic core forming to achieve the effects of improving uniformity, improving yield and reducing uneven thickness

Active Publication Date: 2020-08-04
NANTONG HUAXING MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the object of the present invention is to provide a flat and ultra-thin manganese-zinc ferrite core molding method, which can continuously align the mold with the action of a slingshot impact ball when filling the material powder. The lower mold below the cavity produces a certain impact effect, which effectively reduces the occurrence of uneven thickness of the green embryo after pressing due to the local gaps in the powder in the mold cavity, and can also effectively improve the radial uniformity of the powder. The process of split pressing and split pressing can continuously adjust the uniformity of powder distribution while pressing, and effectively compensate for the uneven density of powder in the radial and axial directions caused by the pressing force, thereby effectively Avoid the deformation of the green body after molding, significantly improve the yield of the magnetic core, and then reduce the cost of production

Method used

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  • Flat and ultrathin manganese zinc ferrite magnetic core forming method
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  • Flat and ultrathin manganese zinc ferrite magnetic core forming method

Examples

Experimental program
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Embodiment 1

[0046] see figure 1 , a method for forming a flat ultra-thin manganese-zinc ferrite core, comprising the following steps:

[0047] S1. Make manganese-zinc-ferrite material powder for magnetic core production, and control the particle diameter distribution of the material powder to be narrow;

[0048] S2. Fill the powder into the mold cavity of the mold, and energize the bottom of the lower mold 2 to make it attractive, thereby attracting the slingshot impact ball to move downward. After 1-2 seconds, the power is turned off, and the slingshot impact ball moves upward. Restore the deformation, so that it hits the bottom of the mold cavity 3 multiple times, and has the effect of vibrating and leveling the upper surface of the powder;

[0049] S3, first electrify the middle part of the lower mold 2, so that the middle part of the lower mold 2 and the slingshot impact ball coagulate and harden, that is, the electrorheological fluid in the vibrating smoothing chamber 51 is energize...

Embodiment 2

[0055] see Figure 6-8 The impact smoothing ball 8 also includes a position control ball 84 embedded in the impact smoothing ball 8, the position control ball 84 is located directly below the inner magnetic block 82, and through the setting of the position control ball 84, the impact smoothing ball 8 as a whole The center is close to the position control ball 84, so that when the impact smoothing ball 8 falls to the bottom of the extension limiting groove 52, the position control ball 84 can always be at the bottom, thereby effectively ensuring that the inner magnetic block 82 is always facing the electromagnet 6. It is the same end, and the inner magnetic block 82 and the electromagnet 6 after electrification close to each other have the same magnetic pole. In this embodiment, the bumping and smoothing ball 8 is directly placed inside the extension limiting groove 52. After the electromagnet 6 is electrified, it can Hitting the smoothing ball 8 produces a repulsive force to m...

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Abstract

The invention discloses a flat and ultrathin manganese zinc ferrite magnetic core forming method and belongs to the technical field of magnetic core forming. According to the flat and ultrathin manganese zinc ferrite magnetic core forming method, a certain impact effect to a lower die below a die cavity can be generated continuously by arranging a slingshot impact ball during power filling, so that a condition that the thickness of a pressed blank is non-uniform as a gap exists locally in powder of the die cavity is reduced effectively, and meanwhile, the radial uniformity of the powder can beimproved effectively. The pressing process is split by pressing at many times, the distributing uniformity of the powder is adjusted continuously while pressing, and a condition of non-uniform density in radial and axial directions of the powder due to pressing stress is compensated effectively, so that deformation generated by a formed blank is avoided effectively, the percent of pass of the magnetic core is improved obviously, and the cost input of production is lowered.

Description

technical field [0001] The invention relates to the technical field of magnetic core molding, and more specifically, relates to a flat and ultra-thin manganese-zinc ferrite magnetic core molding method. Background technique [0002] With the rapid development of modern electronic information equipment, the technical requirements for switching power supplies are also getting higher and higher. Especially in recent years, many electronic information products tend to be miniaturized and ultra-thin (such as high-definition display screens, etc.). Therefore, it is necessary to develop low-loss, High transmission efficiency, low temperature, and small / micro-transformers have always been the common goals of researchers of transformers and magnetic materials. [0003] Soft magnetic manganese zinc ferrite cores are mainly used in the manufacture of various inductors, transformers, filters and choke coils, and are widely used in the field of modern electronic information, such as comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/087B28B3/02
CPCB28B1/087B28B3/022
Inventor 杨美华
Owner NANTONG HUAXING MAGNETIC MATERIAL
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