CN210173836U

CN210173836U - Radial wet pressing die for ferrite magnetic ring

Info

Publication number: CN210173836U
Application number: CN201920664303.1U
Authority: CN
Inventors: Qunhuan Huang; 黄群欢
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-03-24
Anticipated expiration: 2029-05-10

Abstract

The utility model provides a radial wet compression mould of ferrite bead, including well mould, upper punch and lower punch, be equipped with the die cavity that link up from top to bottom on the well mould, the transverse width and the magnetic ring height of die cavity suit, the longitudinal width and the magnetic ring maximum diameter of die cavity suit, the outer wall of upper punch and lower punch with the die cavity inner wall is laminated mutually, and the preceding terminal surface of upper punch and lower punch is the formula of caving in half arc that suits with the magnetic ring outer wall, and the preceding terminal surface of upper punch and lower punch evenly is equipped with the wash port. Because the shapes of the front end faces of the upper male die and the lower male die are respectively matched with the shape of the circular outer wall of the magnetic ring, the upper male die and the lower male die move in the cavity oppositely and extrude slurry in the cavity, and redundant water is uniformly discharged from the end faces of the upper male die and the lower male die, so that the water content of the formed magnetic ring green body along the length direction is consistent, the explosion phenomenon in the sintering process is avoided, and the finished product rate of the magnetic ring is improved.

Description

Radial wet pressing die for ferrite magnetic ring

Technical Field

The utility model relates to the technical field of mold, especially a radial wet compression mould of ferrite bead.

Background

The magnetic ring is a common element in an electronic circuit and is pressed by ferrite materials, the specific pressing mode includes a dry pressing mode and a wet pressing mode, in order to obtain the magnetic ring with better magnetic performance, magnetic orientation can be carried out simultaneously in the pressing process, and the wet pressing method uses slurry added with about 33-37% of water as raw materials, so that the forming and orientation are more convenient, and the wet pressing method is widely used. As shown in fig. 1, a conventional pressing mold includes an upper male mold, a lower male mold, a female mold, and a core bar, which are axially disposed along a magnetic ring, wherein the female mold, the lower male mold, and the core bar form a cavity, slurry is added into the cavity of the mold, and the slurry in the cavity is oriented and pressed by a high-frequency magnetic field generated by a coil disposed at the periphery of the cavity while the mold is closed. About 17% of water needs to be discharged in the forming process, and the water discharge is usually realized on the upper end surface and the lower end surface of the die, so that the water discharge is not uniform for a magnetic ring with a higher height, the water content in the middle of a green body of the magnetic ring is higher than that at the two ends, and the middle of the magnetic ring is easy to expand and explode due to excessive water in the sintering process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of above-mentioned prior art, the utility model aims at providing a be different from the mould of current axial suppression ferrite bead completely, but adopt radial embossing mold utensil, its simple structure is reasonable, make each partial moisture content of magnetic ring unburned bricks all evenly by the radial wet pressing mold utensil of exhaust ferrite bead.

The utility model discloses a realize above-mentioned purpose like this:

the utility model discloses radial wet compression mould of ferrite bead, including well mould, upper male die and lower male die, the die cavity that link up about being equipped with in the well mould, the transverse width and the magnetic ring height of die cavity suit, and the longitudinal width and the magnetic ring maximum diameter of die cavity suit, the outer wall of upper male die and lower male die with the die cavity inner wall is laminated mutually, and the preceding terminal surface of upper male die and lower male die is the formula of caving in half arc that suits with the magnetic ring outer wall, the preceding terminal surface of upper male die and lower male die evenly is equipped with the wash port.

Furthermore, a transverse through hole is formed in the middle of the middle die, a mandrel matched with an inner hole of the magnetic ring is movably mounted in the through hole, and the mandrel transversely penetrates through the middle of the cavity.

Furthermore, at least two coaxial cavities are formed in the middle die, and the mandrel penetrates through the adjacent coaxial cavities.

Furthermore, the upper male die and the lower male die comprise a front-end non-magnetic material punch and a rear-end magnetizer which are of an integrated structure, and the thickness of the punch is in circular arc transition with a thin middle and two thick ends along the semi-arc end surface.

The utility model has the advantages that: the utility model provides a radial wet compression mould of ferrite bead, adopt along the radial suppression of magnetic ring, be equipped with terrace die and lower terrace die respectively in lining up the die cavity from top to bottom in well mould, and the preceding terminal surface shape of terrace die and lower terrace die suits with the circular outer wall shape of magnetic ring respectively, go up the ground paste in the opposite direction operation and the extrusion die cavity of terrace die and lower terrace die in the die cavity, unnecessary moisture is discharged from last terrace die and lower terrace die terminal surface evenly, make the magnetic ring unburned bricks after taking shape unanimously along length direction's water content, the fried phenomenon of splitting among the sintering process has been avoided, the off-the-shelf yield of magnetic ring has been improved.

Drawings

The invention will be further described with reference to the following figures and examples:

FIG. 1 is a schematic view of a magnetic ring mold in the prior art;

fig. 2 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of another embodiment of the present invention;

fig. 4 is a schematic view of a middle mold structure in fig. 3.

In the figure, a die 1, a die cavity 11, a through hole 12, an upper male die 2 and a lower male die 3 are arranged.

Detailed Description

Referring to fig. 2, the ferrite bead radial wet pressing mold comprises a middle mold 1, an upper convex mold 2 and a lower convex mold 3, wherein a cavity 11 which is through from top to bottom is formed in the middle mold 1, the transverse width of the cavity 11 is equal to the height of a bead, the longitudinal width of the cavity 11 is equal to the maximum diameter of the bead, the outer walls of the upper convex mold 2 and the lower convex mold 3 are attached to the inner wall of the cavity 11, the end faces of the upper convex mold 2 and the lower convex mold 3 are in an inward-concave semi-arc shape which is matched with the outer wall of the bead, and drain holes are uniformly formed in the front end faces of the upper convex.

The upper male die 2 and the lower male die 3 are embedded into the cavity 11, quantitative slurry is injected into the cavity 11, the upper male die 2 and the lower male die 3 run oppositely to be extruded and formed, the extrusion forming is carried out along the radial direction of the magnetic ring, the radial size of the magnetic ring is consistent from top to bottom, the extruded redundant water is uniformly discharged from the water discharge holes in the front end faces of the upper male die 2 and the lower male die 3, the residual water content of the formed magnetic ring green body along the length direction is guaranteed to be consistent, the magnetic ring extruded by the die cannot crack in the subsequent sintering process, and the magnetic ring is solid and can be machined to form the shape of the magnetic ring as required.

Referring to fig. 3, a transverse through hole 12 is formed in the middle of the middle die 1, a mandrel adapted to an inner hole of the magnetic ring is movably installed in the through hole 12, and the mandrel transversely penetrates through the middle of the cavity 11.

The outer diameter of the mandrel is equal to the inner diameter of a central hole of the magnetic ring, the mandrel is inserted into a transverse through hole 12 in the middle of a cavity 11 in advance, slurry is injected into the cavity 11, the upper male die 2 and the lower male die 3 are extruded and operated at a constant speed in opposite directions respectively to prevent the mandrel from bending and deforming, the upper stroke and the lower stroke are guaranteed to be consistent, and the mandrel is pulled out after forming.

At least two coaxial cavities 11 are arranged on the middle die 1, and the mandrel penetrates through the adjacent coaxial cavities 11.

Referring to fig. 4, in order to improve the production efficiency, one set of mold may have a plurality of cavities 11 and upper and

lower molds

2 and 3, and the same mandrel may simultaneously pass through adjacent coaxial cavities 11.

The front ends of the upper male die 2 and the lower male die 3 are non-magnetic-conducting material punches, the rear ends of the upper male die and the lower male die are magnetizers of an integrated structure, and the thickness of the punches is in circular arc transition with a thin middle and thick two ends along the semi-arc end surface.

The magnetic orientation and the radial extrusion forming of the magnetic ring along the radial direction can be simultaneously finished, because the extrusion is carried out along the radial direction, and the extrusion end face is arc-shaped, in order to ensure that the magnetic force of the magnetic ring along the radial direction is uniform, the upper convex die 2 and the lower convex die 3 are divided into a punch head made of non-magnetic conductive material at the front end and a magnetizer at the rear end, the punch head part can be made of stainless steel materials, and the thickness of the punch head part is not consistent along the half arc-shaped end and is thin in the middle and.

Therefore, the utility model discloses a radial wet compression mould of ferrite bead simple structure, extrusion atress are even, make the magnetic ring keep the drainage even at the shaping in-process, have improved the yield of magnetic ring greatly.

Claims

1. The ferrite bead radial wet-pressing die is characterized in that: the magnetic ring type water cooling device comprises a middle die (1), an upper convex die (2) and a lower convex die (3), wherein a cavity (11) which is through up and down is formed in the middle die (1), the transverse width of the cavity (11) is equal to the height of a magnetic ring, the longitudinal width of the cavity (11) is equal to the maximum diameter of the magnetic ring, the outer walls of the upper convex die (2) and the lower convex die (3) are attached to the inner wall of the cavity (11), the front end faces of the upper convex die (2) and the lower convex die (3) are in an inward-concave semi-arc shape which is matched with the outer wall of the magnetic ring, and drain holes are uniformly formed in the front end faces of.

2. The ferrite bead radial wet pressing mold as claimed in claim 1, wherein: a transverse through hole (12) is formed in the middle of the middle die (1), a mandrel matched with an inner hole of the magnetic ring is movably installed in the through hole (12), and the mandrel transversely penetrates through the middle of the cavity (11).

3. The ferrite bead radial wet pressing mold as claimed in claim 2, wherein: the middle die (1) is provided with at least two coaxial die cavities (11), and the mandrel penetrates through the adjacent coaxial die cavities (11).

4. The ferrite bead radial wet pressing mold as claimed in claim 3, wherein: the front ends of the upper male die (2) and the lower male die (3) are non-magnetic material punches, the rear ends of the upper male die and the lower male die are magnetizers of an integrated structure, and the thickness of the punches is in circular arc transition with a thin middle and thick two ends along the semi-arc end surface.