CN214175851U

CN214175851U - High-efficient forming die of high-density magnetic core

Info

Publication number: CN214175851U
Application number: CN202022360179.5U
Authority: CN
Inventors: 林辉; 孙洪明; 吴海曙; 钱林玉; 钱明兴
Original assignee: Haining Spark Electronics Co ltd
Current assignee: Haining Spark Electronics Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-09-10
Anticipated expiration: 2030-10-21

Abstract

The utility model provides a high-efficient forming die of high density magnetic core belongs to mechanical technical field. It has solved prior art and has had the poor problem of stability. This high-efficient forming die of high density magnetic core includes die body and the last die body of ability lock on die body down, still includes a location section of thick bamboo, ejector pin and spring down, and above-mentioned location barrel casing is die body lower extreme department under, and the bottom department in a location section of thick bamboo is connected to above-mentioned ejector pin lower extreme, and it is internal that the lower die is worn to establish on the ejector pin upper end, and above-mentioned spring housing is on the ejector pin and the both ends of spring are used in die body and a location section of thick bamboo under respectively, and the ejector pin upper end is located the internal bottom department of lower die under the spring action of spring. The high-efficiency forming process of the high-density magnetic core is stable, and the die is high in operating efficiency.

Description

High-efficient forming die of high-density magnetic core

Technical Field

The utility model belongs to the technical field of machinery, a high-efficient forming die of high density magnetic core is related to.

Background

Along with the integration and miniaturization of electronic products, the smaller the transformer is, the smaller the corresponding magnetic core product is; in the sintering process, the magnetic cores are stacked in the sintering furnace, and in order to prevent adhesion between contact surfaces of the stacked magnetic cores in the sintering process, a layer of corundum sand is generally scattered between the magnetic cores, and then the surface layers of the magnetic cores are ground off after sintering, so that material waste is caused.

Disclosure of Invention

A first object of the present invention is to solve the above problems in the prior art, and to provide a high-efficiency molding process for a high-density magnetic core with stable molding.

The second purpose of the utility model is to provide a mould that high-efficient forming technology of high density magnetic core used in the base process.

The first object of the present invention can be achieved by the following technical solutions:

an efficient molding process for a high-density magnetic core, comprising the steps of:

A. blank preparation: pressing the raw materials mixed in proportion into a magnetic core blank by using a magnetic core die;

B. sintering preparation: the material plate is provided with a plurality of concave positioning notches, isolation powder is uniformly coated at the positioning notches, and then the magnetic core blank is placed into the positioning notches with the isolation powder;

D. and (3) sintering: feeding the material plate with the magnetic core blank into a sintering furnace, sintering at 280-310 ℃ for 4-5 hours, and sintering to obtain a semi-finished magnetic core;

E. and (3) post-treatment: and taking out the sintered semi-finished magnetic core, and wiping off the isolation powder at the bottom of the semi-finished magnetic core to obtain the finished magnetic core.

In the high-efficiency molding process of the high-density magnetic core, the isolating powder in the step B is mixed powder of aluminum nitride powder with the grain diameter of 400-600 meshes and boron nitride powder with the grain diameter of 400-600 meshes according to the mass ratio of 1: 2-3.

The mixed material of the aluminum nitride powder and the boron nitride powder can resist high temperature, and meanwhile, the stable isolation between the magnetic core and the material plate can be ensured due to the small particle size.

And the sintered and molded magnetic core can not be adhered with the isolating powder.

The forming process creatively arranges a plurality of positioning notches on the material plate, and the magnetic core blank to be sintered is arranged at the corresponding positioning notches. Of course, there is a spacer powder at the positioning recess where the core blank is placed.

It can be seen that the positioning notch can stably position the magnetic core blank, and the isolating powder can avoid adhesion between the magnetic core blank and the material plate in the forming process.

The second object of the present invention can be achieved by the following technical solutions:

the utility model provides a high-efficient forming die of high density magnetic core, includes die body and the last die body of ability lock on die body down, its characterized in that still includes a location section of thick bamboo, ejector pin and spring, and above-mentioned location barrel casing is die body lower extreme department under, and the bottom department in a location section of thick bamboo is connected to above-mentioned ejector pin lower extreme, and it is internal that the lower die is worn to establish in the ejector pin upper end, and above-mentioned spring housing is on the ejector pin and the both ends of spring are used in die body and a location section of thick bamboo under respectively, and ejector pin upper end is located the internal bottom department of lower die under the spring action of spring.

During initial state, the lower die body is not stretched out to ejector pin upper end, goes up the die body and forms the shaping chamber with magnetic core assorted between the two with the lower die body lock back.

After the magnetic forming, the upper die body is separated, then, external force is applied to enable the lower die body to move downwards relative to the positioning barrel, the fixed ejector rod pushes out the magnetic core in the lower die body after the lower die body moves downwards, and the magnetic core separated from the lower die body is convenient to take.

Of course, the lower die body is reset by moving upwards again after the external force application is stopped.

In the efficient forming die for the high-density magnetic core, the upper end of the ejector rod is fixedly connected with a plate-shaped top plate, and the top plate is matched with the inner cavity of the lower die body.

The magnetic core in the lower die body can be stably pushed out through the top plate.

In the efficient forming die for the high-density magnetic core, the positioning cylinder port is provided with a smoothly-transiting lead-in part.

The arrangement of the leading-in part can avoid the jamming between the lower die body and the positioning cylinder.

In the efficient molding die for the high-density magnetic core, the guiding-in part is a chamfer at the end of the positioning cylinder.

In the efficient molding die for the high-density magnetic core, the guiding-in part is a round angle at the end of the positioning cylinder.

The high-efficiency forming die for the high-density magnetic core further comprises a cushion block, a through positioning hole is formed in the side portion of the positioning cylinder, the cushion block is embedded in the positioning hole, the inner end of the cushion block is located in the positioning cylinder, the inner end of the cushion block can be tightly pressed between the lower die body and the positioning cylinder, and the outer end of the cushion block extends out of the side portion of the positioning cylinder.

And in an initial state, the inner end of the cushion block is tightly pressed between the lower die body and the positioning cylinder, and at the moment, the lower die body cannot move downwards relative to the positioning cylinder.

On the contrary, when the inner end of the cushion block is separated, the lower die body can move downwards relative to the positioning cylinder under the action of external force.

Compared with the prior art, the high-efficiency forming of the high-density magnetic core can enable the formed magnetic core to be stably separated from the material plate, and the forming stability is higher.

Meanwhile, the forming die can conveniently take out the magnetic core blank formed by pressing only by pulling out the cushion block and applying external force to move the lower die body downwards in the demoulding process, so that the forming operation efficiency and the stability are higher.

Drawings

Fig. 1 is a schematic structural view of the high-efficiency molding die for the high-density magnetic core.

In the figure, 1, an upper mold body; 2. a lower die body; 3. a positioning cylinder; 3a, an introduction part; 3b, positioning holes; 4. a top rod; 4a, a top plate; 5. a spring; 6. and a cushion block.

Detailed Description

The high-efficiency forming process of the high-density magnetic core comprises the following steps:

and the isolation powder in the step B is mixed powder of aluminum nitride powder with the grain diameter of 400-600 meshes and boron nitride powder with the grain diameter of 400-600 meshes according to the mass ratio of 1: 2-3.

This high-efficient forming die of high density magnetic core, including die body and the last die body of ability lock on die body down, still include a location section of thick bamboo, ejector pin and spring, above-mentioned location barrel casing die body lower extreme department under, the bottom department in a location section of thick bamboo is connected to above-mentioned ejector pin lower extreme, and it is internal that the lower die is worn to establish on the ejector pin upper end, and above-mentioned spring housing is on die body and a location section of thick bamboo under and the both ends of spring are used for respectively on, and ejector pin upper end is located the internal bottom department of lower die under the spring action of spring.

The upper end of the ejector rod is fixedly connected with a plate-shaped top plate, and the top plate is matched with the inner cavity of the lower die body.

The end opening of the positioning cylinder is provided with a smoothly-transitional leading-in part.

The leading-in part is a chamfer at the end of the positioning cylinder.

The leading-in part is a fillet at the port of the positioning cylinder.

The positioning cylinder is characterized by further comprising a cushion block, a through positioning hole is formed in the side portion of the positioning cylinder, the cushion block is embedded in the positioning hole, the inner end of the cushion block is located in the positioning cylinder, the inner end of the cushion block can be tightly pressed between the lower die body and the positioning cylinder, and the outer end of the cushion block extends out of the side portion of the positioning cylinder.

Claims

1. The utility model provides a high-efficient forming die of high density magnetic core, includes die body and the last die body of ability lock on die body down, its characterized in that still includes a location section of thick bamboo, ejector pin and spring, and above-mentioned location barrel casing is die body lower extreme department under, and the bottom department in a location section of thick bamboo is connected to above-mentioned ejector pin lower extreme, and it is internal that the lower die is worn to establish in the ejector pin upper end, and above-mentioned spring housing is on the ejector pin and the both ends of spring are used in die body and a location section of thick bamboo under respectively, and ejector pin upper end is located the internal bottom department of lower die under the spring action of spring.

2. A high efficiency forming die for high density magnetic cores as claimed in claim 1, wherein the top of the top rod is fixed with a plate-like top plate, and the top plate is matched with the inner cavity of the lower die body.

3. A high efficiency forming die for high density magnetic core as claimed in claim 2, wherein said positioning barrel has a smooth transition lead-in at the end.

4. A high-efficiency forming die for a high-density magnetic core according to claim 3, wherein the lead-in portion is a chamfer at an end of the positioning cylinder.

5. A high efficiency forming die for high density magnetic core as claimed in claim 3, wherein said lead-in part is a rounded corner at the end of the positioning cylinder.

6. The mold for efficiently molding a high-density magnetic core according to claim 4, further comprising a spacer, wherein the side portion of the positioning cylinder has a through positioning hole, the spacer is embedded in the positioning hole, an inner end of the spacer is located in the positioning cylinder, an inner end of the spacer can be tightly pressed between the lower mold body and the positioning cylinder, and an outer end of the spacer extends out of the side portion of the positioning cylinder.