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Conjoined forming mold for flat EFD ferrite cores and forming method of conjoined forming mold

A technology for ferrite magnets and forming molds, which is applied in the direction of molds, forming indenters, ceramic forming machines, etc. It can solve the problems of small size tolerance, uneven density distribution, small stress, etc., and achieve the improvement of overall support force and easy density Controlling, Controlling Effects on Deformation Problems

Inactive Publication Date: 2017-12-01
NANTONG HUAXING MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the EFD magnetic core adopts a design in which the center column is thinner than the side legs, and the size of the magnetic core is generally large, coupled with the characteristics of thin thickness, small dimensional tolerance, and high flatness requirements, if the traditional pressing method is used, when the magnetic core is formed, The density distribution is uneven, the stress that the magnetic core is too thin can withstand is small, and it is easy to deform during sintering, resulting in a size error of -1J

Method used

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  • Conjoined forming mold for flat EFD ferrite cores and forming method of conjoined forming mold

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] like figure 1 A conjoined molding die for a flat EFD ferrite core shown, including a cavity 1, an upper die 2, a lower die 3 and a mandrel 4, and a cavity 1, an upper die 2, a lower die 3 and a mandrel 4 After the mold is closed, two flat EFD ferrite cores can be formed with an E-shaped cavity 5 connected to the back.

[0015] A joint forming method of a flat EFD type ferrite core, comprising the steps of:

[0016] 1) First, fill the core material into the cavity of the mold;

[0017] 2) Extrude the upper die 2 and the lower die 3 simultaneously by a bidirectional mechanical press;

[0018] 3) Carry out sintering shrinkage again;

[0019] 4) After forming, it is cut and polished into the desired finished product.

[0020] In some embodiments, when the magnetic core material is filled in step 1), the two side legs and the center column of the E-sha...

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Abstract

The invention discloses a conjoined forming mold for flat EFD ferrite cores and a forming method of the conjoined forming mold. The forming mold comprises a mold cavity, an upper mold, a lower mold and a mandrel, wherein after the mold cavity, the upper mold, the lower mold and the mandrel are assembled, an E-shaped cavity is formed through the formation of the two flat EFD ferrite cores which are back-to-back and siamesed. The conjoined forming mold for flat EFD ferrite cores and the forming method of the conjoined forming mold have the advantages that the forming method of the conjoined forming mold has the characteristics that the lower mold is composed of a middle push rod and an edge push rod which are fixed on the same base, and semicircle grooves which are used for cutting blanks are correspondingly formed in the middle push rod and the edge push rod; compared with a traditional technology, the control on product deformation is more favorable, and the tolerance of the size of finished products can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of magnetic cores, in particular to a conjoined forming mold of a flat EFD type ferrite magnetic core and a forming method thereof. Background technique [0002] EFD type ferrite core is widely used in various planar transformers due to its large window area, thin product, high output power, and suitable for surface mounting, especially in LED TV backlight drive transformers. In recent years, with the rapid growth of the LED backlight TV market, the amount of such ferrite products is increasing. However, since the EFD magnetic core adopts a design in which the center column is thinner than the side legs, and the size of the magnetic core is generally large, coupled with the characteristics of thin thickness, small dimensional tolerance, and high flatness requirements, if the traditional pressing method is used, when the magnetic core is formed, The density distribution is uneven, and the stress that the mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02B28B7/00B28B3/08
CPCH01F41/0246B28B3/086B28B7/0097
Inventor 杨美华
Owner NANTONG HUAXING MAGNETIC MATERIAL