CN210575333U

CN210575333U - EDR type soft magnetic ferrite magnetic core blank

Info

Publication number: CN210575333U
Application number: CN201921900607.XU
Authority: CN
Inventors: 沈永春; 陈魏魏; 王建敏
Original assignee: Shanghai Kangshun Magnetism Component Factory Co ltd
Current assignee: Shanghai Kangshun Magnetism Component Factory Co ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-05-19
Anticipated expiration: 2029-11-06

Abstract

The utility model discloses a EDR type soft magnetic ferrite magnetic core blank, including the bottom plate, be fixed with the wrapping post of long circle form along the central line of longer direction at the bottom plate front surface, the bottom plate front surface border position of wrapping post both sides is equipped with the side column respectively, the edge that the rear surface both sides of bottom plate were equipped with the side column is the chamfer, is equipped with the bar recess of long circle form respectively in the position both sides that the bottom plate rear surface corresponds to the wrapping post, and the bar recess is parallel with the wrapping post each other, and the length of bar recess is not more than the length of wrapping post, and the nearest distance between the bar recess is greater than the width of wrapping post. The utility model provides a magnetic core blank can not arouse the phenomenon that the side column warp and the wrapping post drops because of the density inequality in sintering process, guarantee the magnetic core at the yields of suppression process, improve production efficiency.

Description

EDR type soft magnetic ferrite magnetic core blank

Technical Field

The utility model relates to a magnetic core, in particular to magnetic core blank.

Background

Magnetic cores are sintered magnetic metal oxides composed of various iron oxide mixtures, and ferrite cores are used in the prior art in coils and transformers for various electronic devices. For example, manganese zinc ferrite and nickel zinc ferrite are typical magnetic core materials, wherein manganese zinc ferrite has characteristics of high magnetic permeability and high magnetic flux density, and has characteristics of low loss at a frequency lower than 1MHz, nickel zinc ferrite has characteristics of extremely high impedance, low magnetic permeability of less than several hundred, and the like, and generates low loss at a frequency higher than 1MHz, and the like.

In the process of designing and producing the EDR20A magnetic core, two side edges of the rear surface of the bottom plate of the magnetic core need to be chamfered, so when the front surface of the bottom plate of the magnetic core pressed by a full-automatic dry powder press is flat, the structure causes the density of the chamfered part to be higher than that of other parts on the magnetic core, and after the magnetic core is sintered, the high density of the position causes shrinkage, so that local parts are easy to cause product deformation, and the rejection rate is high. And because the wrapping post of EDR magnetic core is long round, its length is longer, when the compression molding, needs more powder, this probability that has just increased greatly and met the inhomogeneous or moisture inhomogeneous condition of powder granule between magnetic core bottom plate and the wrapping post, just also increase the probability that the wrapping post drops easily.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides an EDR type soft magnetic ferrite magnetic core blank guarantees that the phenomenon that the product warp and the wrapping post drops can not appear in the magnetic core in sintering process.

The utility model discloses a following technical scheme realizes:

EDR type soft magnetic ferrite magnetic core blank, including the bottom plate, be fixed with the wrapping post of long circle form along the central line of longer direction at the bottom plate front surface, the bottom plate front surface border position of wrapping post both sides is equipped with the side pole respectively, the edge that the rear surface both sides of bottom plate were equipped with the side pole is the chamfer, is equipped with the bar recess of long circle form respectively in the position both sides that the bottom plate rear surface corresponds to the wrapping post, and the bar recess is parallel to each other with the wrapping post, and the length of bar recess is not more than the length of wrapping post, and the nearest distance between the bar recess is greater than the width of wrapping post.

The angle of the chamfer was 40 °.

The utility model has the advantages that:

the utility model provides a magnetic core blank that the suppression is good lead to the problem that the waste product produced because of the inhomogeneous powder density of suppression in sintering process, the position both sides through the bottom plate rear surface at the magnetic core correspond the wrapping post are equipped with the bar recess of long circle form respectively, adjacent wrapping post and chamfer of bar recess, be located position between the two, make the density increase of this partial magnetic core powder on the bottom plate, guarantee the wrapping post, bottom plate and wrapping post are connected, the compaction between the partial powder granule of bottom plate and limit post connection, the compaction, it is even to press, it is even to reduce the probability that this regional powder granule is inhomogeneous or the inhomogeneous situation of moisture takes place. The full-automatic dry powder press is in the pressing process, the pressure of suppression is balanced, and the magnetic core blank density that the suppression is good is even, therefore later process is in the sintering, and the magnetic core can not arouse the phenomenon that the side column warp, the wrapping post drops because of the density is uneven, and the yield promotes greatly.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a rear view of the present invention.

Fig. 3 is a left side view of the present invention.

Detailed Description

In the present embodiment, the length direction is uniformly referred to the edge direction of the side pillar 3 on the bottom plate 1, and the edge direction of one side without the side pillar 3 is the width direction.

Combine fig. 1 to fig. 3, the utility model discloses be fixed with wrapping post 2 of long circle form along the central line of longer direction at 1 front surface of bottom plate, 1 front surface border position of bottom plate of 2 both sides of wrapping post are equipped with side column 3 respectively, the edge that the rear surface both sides of bottom plate 1 were equipped with side column 3 is 40 chamfers 5.

The position both sides that are corresponding to wrapping post 2 at bottom plate 1 rear surface are equipped with the bar recess 4 of long circle form respectively, and bar recess 4 is parallel to each other with wrapping post 2, and the length of bar recess 4 is not more than the length of wrapping post 2, and the nearest distance between bar recess 4 is greater than the width of wrapping post 2.

Specifically, taking an EDR20A magnetic core blank actually produced by the applicant as an example, the length of the bottom plate is 23.72mm, the width is 15.30mm, and the height of the whole magnetic core is 5.65 mm; the height of the side column is 1.80mm, and the width of the side column is 1.26 mm; the height of the winding post is 1.80mm, and the length of the winding post is 18.90 mm; the length of the strip-shaped groove is 18.0mm, the width is 1.60mm, and the depth is 0.2 mm. After the magnetic powder is pressed into a magnetic core blank by a full-automatic dry powder press, sintering is started, the sintered magnetic core blank is ground, and the parts of the rear surface of the bottom plate except the strip-shaped grooves 4 are ground, so that the rear surface of the bottom plate is smooth, and a finished magnetic core product is obtained.

Claims

1. EDR type soft magnetic ferrite magnetic core blank, including the bottom plate, the central line along longer direction at bottom plate front surface is fixed with the wrapping post of long circle form, and the bottom plate front surface border position of wrapping post both sides is equipped with limit post, its characterized in that respectively: the edge that the rear surface both sides of bottom plate were equipped with the side column is the chamfer, is equipped with the bar recess of rectangular form respectively in the position both sides that the bottom plate rear surface corresponds to the wrapping post, and bar recess is parallel to each other with the wrapping post, and the length of bar recess is not more than the length of wrapping post, and the nearest distance between the bar recess is greater than the width of wrapping post.

2. An EDR-type soft magnetic ferrite core blank according to claim 1, characterized in that: the angle of the chamfer was 40 °.