CN218286021U

CN218286021U - Mold for reducing deformation of large ferrite core

Info

Publication number: CN218286021U
Application number: CN202222575423.9U
Authority: CN
Inventors: 刘云龙; 吕志环
Original assignee: Shandong Dongtai Fangsi Electronic Co ltd
Current assignee: Shandong Dongtai Fangsi Electronic Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-01-13
Anticipated expiration: 2032-09-28

Abstract

A mold for reducing deformation of a large ferrite core belongs to the technical field of ferrite core molds. The method is characterized in that: a U-shaped die cavity (501) is arranged in the female die (5), the upper die (2) and the bottom die are arranged on the upper side and the lower side of the female die (5) respectively, the upper portion of the bottom die extends into the die cavity (501), the lower portion of the upper die (2) can slidably extend into the die cavity (501), and the two sides of the die cavity (501) are inclined inwards gradually along the direction close to the end portion. This mould that reduces large-scale ferrite core deformation's last mould cooperatees with the lower mould, and the material of moulding intracavity is suppressed to form the ferrite core blank, the both sides of die cavity are along the inward slope form gradually of the direction that is close to the tip, set up the negative deformation on the mould, and the magnetic core blank of suppression also has the negative deformation, and after the sintering is accomplished, negative deformation and positive deformation offset, make the magnetic core after the sintering accord with the size requirement, and the precision is high when mating.

Description

Mold for reducing deformation of large ferrite core

Technical Field

A mold for reducing deformation of a large ferrite core belongs to the technical field of ferrite core molds.

Background

The production process of the ferrite core is generally a forming process, a sintering process, a grinding process and the like, wherein the forming process is generally formed by pressing a mold. The existing ferrite cores are generally in two types, one type is a groove type, the other type is a U-shaped type, and the groove type ferrite core has two right angles and has deviation with the direction of an internal magnetic field, so the existing ferrite core mainly takes the U-shaped type as the main part.

The ferrite core of U-shaped is firing the completion back, and two vertical portions can appear warping, lead to pairing the variation, and along with the increase of vertical portion, pairing error can grow, can lead to seriously can lead to the product to be unqualified in batches when serious. To the operating mode that the required precision is low, burn the use that can not hinder ferrite core of the deformation of two vertical portions after accomplishing, but to the operating mode that the required precision is high, the required precision that the operating mode can't be satisfied in the deformation of two vertical portions. At present, no method is provided for solving the problem of deformation of two vertical parts of the magnetic core after firing.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, and the die for reducing the deformation of the large ferrite core, which is added with negative deformation and can realize the offset of the deformation during sintering, is provided.

The utility model provides a technical scheme that its technical problem adopted is: this reduce mould of large-scale ferrite core deformation, its characterized in that: including last mould, die and die block, be provided with the die cavity of U-shaped in the die, go up the mould and the die block sets up respectively in the upper and lower both sides of die, in the die cavity was stretched into on the upper portion of die block, in the lower part slidable of going up the mould stretched into the die cavity, the both sides of die cavity were along the inside slope form gradually of the direction that is close to the tip.

Preferably, the included angle between the two sides of the die cavity and the symmetry axis of the die cavity is 0.2-0.8 degrees.

Preferably, the included angle between the two sides of the die cavity and the symmetry axis of the die cavity is 0.55 degrees.

Preferably, the bottom die comprises a lower die and a core, the core is slidably disposed in the lower die, and the top of the core and the top of the lower die both extend into the die cavity.

Preferably, the outer wall of the core is spaced from the inner wall of the mould cavity.

Preferably, the lower die is in a cylindrical shape with two open ends, and the lower end of the mold core extends out of the lower die.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

the inventor finds that after the sintering of the magnetic core blank is finished, outward deformation can occur at two ends of the ferrite magnetic core, two sides of the die cavity are inclined gradually inwards along the direction close to the end part, negative deformation is arranged on the die, the pressed magnetic core blank also has negative deformation, after the sintering is finished, the negative deformation and the positive deformation are offset, so that the sintered magnetic core meets the size requirement, and the precision is high when the die is paired.

Drawings

Fig. 1 is a front cross-sectional view of a mold for reducing deformation of a large ferrite core.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic top view of a pressed ferrite core blank.

Fig. 4 is a schematic front cross-sectional view of a ferrite core blank.

Fig. 5 is a partially enlarged view of B in fig. 4.

In the figure: 1. the die comprises an upper die pressing plate 2, an upper die 3, a female die support ring 4, a female die pressing ring 5, a female die 501, a die cavity 6, an upper die stress plate 7, a lower die 8, a lower die pressing plate 9, a lower die stress plate 10, a lower die base 11, a core 12, a core stress plate 13, a core pressing plate 14, a core extension rod 15, a core bottom rod 16, a magnetic core blank 1601, a vertical part 1602, a connecting part 1603, an arc transition part 1604, a horizontal transition part 17 and a female die platform.

Detailed Description

The present invention is further described with reference to specific embodiments, however, it will be understood by those skilled in the art that the detailed description given herein with respect to the drawings is for better explanation and that the present invention is necessarily to be construed as limited to those embodiments, and equivalents or common means thereof will not be described in detail but will fall within the scope of the present application.

Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 5.

The utility model provides a reduce mould of large-scale ferrite core deformation, includes mould 2, die 5 and die block, is provided with the die cavity 501 of U-shaped in the die 5, goes up mould 2 and die block and sets up respectively in the upper and lower both sides of die 5, and in the die cavity 501 was stretched into on the upper portion of die block, the lower part slidable of going up mould 2 stretched into in the die cavity 501, and the both sides of die cavity 501 are along the inward slope form gradually of the direction that is close to the tip. The inventor finds that after the magnetic core blank 16 is sintered, outward deformation can occur at both ends of the ferrite magnetic core, both sides of the die cavity are gradually inward inclined along the direction close to the end, negative deformation is arranged on the die, the pressed magnetic core blank 16 also has negative deformation, after the sintering is finished, the negative deformation and the positive deformation are offset, so that the sintered magnetic core meets the size requirement, and the precision is high when the die is matched.

Specifically, the method comprises the following steps: as shown in FIGS. 1 to 2: the top of the upper die pressing plate 1 is provided with an upper die stress plate 6, the upper die pressing plate 1 is detachably connected with the upper die stress plate 6, the upper portion of the upper die 2 is arranged between the upper die pressing plate 1 and the upper die stress plate 6, the upper die pressing plate 1 and the upper die stress plate 6 are matched to fix the upper portion of the upper die 2, and the upper die stress plate 6 is arranged on a press machine. The press machine can be made of the existing equipment, and the structure of the press machine is not described in detail herein. The top of the upper die 2 is provided with an upper die fixing part matched with the upper die stress plate 6 and the upper die pressing plate 1.

The lower side of the female die 5 is sequentially provided with a female die platform 17, a female die support ring 3 and a female die pressing ring 4 from bottom to top, the middle of the female die 5 is provided with a die cavity 501, the die cavity 501 penetrates through the female die 5 in the vertical direction, and the bottom of the female die platform 17 is installed on a press machine. The die support ring 3 is detachably installed on the die platform 17, the die compression ring 4 is detachably installed on the die support ring 3, the die support ring 3 and the die compression ring 4 are uniformly arranged around the die 5, an inward flanging is arranged at the top of the surrounding die compression ring 4, an outward flanging is arranged at the bottom of the surrounding die 5, the flanging extends into the space between the inward flanging and the die support ring 3, the die compression ring 4 compresses the outward flanging of the die 5 on the die support ring 3 through the inward flanging, and therefore the fastening of the die 5 is realized.

The die block includes lower mould 7 and

core

11, and 7 vertical settings of lower mould are at the downside of die 5, and lower mould 7 is the equal open cylindric in both ends from top to bottom, and 7 slidable covers of lower mould are established outside core 11, and lower mould 7 can be stretched out to the upper end of core 11, also can contract and enter into in the lower mould 7, and lower mould 7 is stretched out downwards to the bottom of core 11, and the outer wall of core 11 sets up with the inner wall interval of die cavity 501.

Be provided with lower clamp plate 8 and lower mould atress board 9 at lower mould 7's downside, lower mould atress board 9 detachable installs the upside at lower mould base 10 to install on the press through lower mould base 10 detachable, lower clamp plate 8 detachable installs the upside at lower mould atress board 9, the lower part setting of core 11 is between lower mould atress board 9 and lower clamp plate 8, lower clamp plate 8 cooperatees with lower mould atress board 9 and compresses tightly fixedly the bottom of lower mould 7. The bottom of the lower die 7 is provided with a lower die fixing part matched with a lower die pressing plate 8 and a lower die stress plate 9.

The bottom of the core 11 is mounted on a core foot 15, the core foot 15 being detachably connected to the press. The bottom of core 11 is provided with the core and connects pole 14, the bottom and the core sill bar 15 detachable of core connects pole 14 are connected, be provided with core atress board 12 and core clamp plate 13 between the top of core connects pole 14 and the bottom of core 11, core atress board 12 and the top detachable of core connects pole 14 are connected, core clamp plate 13 and core atress board 12 detachable are connected, the bottom setting of core 11 is between core atress board 12 and core clamp plate 13, core clamp plate 13 cooperatees with core atress board 12 and fixes the bottom of core 11. The bottom of the core 11 is provided with a core fixing part which is matched with the core pressing plate 13 and the core stress plate 12.

The bottom of the upper die 2 slidably extends into the die cavity 501, the outer part of the upper die 2 is attached to the inner wall of the die cavity 501, and the upper die 2 and the inner wall of the die cavity 501 can slide relatively. The bottom of the lower die 7 can slidably extend into the die cavity 501, the outer wall of the lower die 7 is attached to the inner wall of the die cavity 501, and the outer wall of the lower die 7 and the inner wall of the die cavity 501 can slide relatively. The outer wall of the core 11 is attached to the inner wall of the lower die 7, and the inner wall of the core 11 and the inner wall of the lower die 7 can slide relatively.

Both sides of the cavity 501 are tapered inward in a direction toward the end, and a negative deformation amount is added to the cavity 501. The included angle between the two sides of the mold cavity 501 and the symmetry axis of the mold cavity 501 is 0.2-0.8 °, and in this embodiment, the included angle between the two sides of the mold cavity 501 and the symmetry axis of the mold cavity 501 is 0.55 °.

As shown in fig. 3: the vertical portions 1601 on both sides of the magnetic core blank 16 pressed by the die for reducing the deformation of the large-sized ferrite core are all in an inclined shape gradually from bottom to top, so that negative deformation is added on the two vertical portions 1601 of the magnetic core blank 16.

A connecting portion 1602 is provided between the tops of the two vertical portions 1601, and the connecting portion 1602 can further eliminate the deformation of the two vertical portions 1601 after sintering.

As shown in FIGS. 4 to 5: the right angle department of each vertical portion 1601 all is provided with transition portion, and transition portion includes arc transition portion 1603 and horizontal transition portion 1602, and arc transition portion 1603 and horizontal transition portion 1602 from interior to exterior set gradually, and arc transition portion 1603 is the fan-shaped of middle part evagination, and the top of arc transition portion 1603 is tangent with the top of vertical portion 1601, and the inboard of horizontal transition portion 1604 is connected with the bottom of arc transition portion 1603, and the outside is connected with the outside of vertical portion 1601.

The magnetic core blank 16 of the die for reducing the deformation of the large ferrite core has two modes, namely bidirectional pressing and floating pressing. The two-way pressing process is as follows:

firstly, the lower die 7 moves downwards, the top of the lower die 7 reaches a set position of the die cavity 501, the upper die 2, the core 11 and the female die 5 are kept static, the top of the core 11 is flush with the top of the female die 5, then a pressing material is put into the die cavity 501, after the material is placed, the upper die 2 moves downwards until the top of the upper die 2 is attached to the top of the core 11, then the lower die 7 moves upwards, the upper die 2 moves downwards, the female die 5 and the core 11 are kept static, and the upper die 2 and the lower die 7 are matched to realize the pressing of the magnetic core blank 16.

The floating pressing process is as follows:

firstly, the female die 5 and the core 11 move upwards to a set position simultaneously, the upper die 2 and the lower die 7 keep static, the top of the core 11 is flush with the top of the female die 5, then a pressing material is put into the die cavity 501, after the material is placed, the upper die 2 moves downwards until the top of the upper die 2 is attached to the top of the core 11, then the upper die 2, the female die 5 and the core 11 move downwards simultaneously, at the moment, the lower die keeps static, and the upper die 2, the female die 5 and the core 11 are matched to realize the pressing of the magnetic core blank 16.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a reduce mould that large-scale ferrite core warp which characterized in that: including last mould (2), die (5) and die block, be provided with die cavity (501) of U-shaped in die (5), go up mould (2) and die block and set up respectively in the upper and lower both sides of die (5), in die cavity (501) was stretched into on the upper portion of die block, in the lower part slidable of going up mould (2) stretched into die cavity (501), the both sides of die cavity (501) were along the direction that is close to the tip inwards slope form gradually.

2. The mold for reducing deformation of a large-sized ferrite core according to claim 1, wherein: the included angle between the two sides of the die cavity (501) and the symmetry axis of the die cavity (501) is 0.2-0.8 degrees.

3. The mold for reducing deformation of a large ferrite core according to claim 2, wherein: the included angle between the two sides of the die cavity (501) and the symmetry axis of the die cavity (501) is 0.55 degrees.

4. The mold for reducing deformation of a large ferrite core according to claim 1, wherein: the bottom die comprises a lower die (7) and a core (11), wherein the core (11) can be arranged in the lower die (7) in a sliding mode, and the top of the core (11) and the top of the lower die (7) both extend into the die cavity (501).

5. The mold for reducing deformation of a large-sized ferrite core according to claim 4, wherein: the outer wall of the core (11) and the inner wall of the die cavity (501) are arranged at intervals.

6. The mold for reducing deformation of a large ferrite core according to claim 4, wherein: the lower die (7) is in a cylindrical shape with two open ends, and the lower end of the mold core (11) extends out of the lower die (7).