CN114551074B - Inductance manufacturing method - Google Patents
Inductance manufacturing method Download PDFInfo
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- CN114551074B CN114551074B CN202210004194.7A CN202210004194A CN114551074B CN 114551074 B CN114551074 B CN 114551074B CN 202210004194 A CN202210004194 A CN 202210004194A CN 114551074 B CN114551074 B CN 114551074B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention discloses a manufacturing method of an inductor, which comprises the following steps: s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials; s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product; s3, sintering and solidifying the semi-finished product to form an inductor, adopting a hard magnetic material or a soft magnetic material as magnetic powder, adopting a guide sheet stacking mode to replace a coil, matching with high-pressure forming and high-temperature sintering, improving the energy density of the inductor, further improving the inductance value of the inductor, and enabling the outside of the guide sheet to be free of an insulating layer, directly utilizing the magnetic powder to perform insulating isolation among windings, improving the temperature resistance grade of the inductor, and improving the temperature resistance grade from 125-180 ℃ to above 300 ℃, thereby ensuring the small size of the inductor and improving the temperature resistance grade and the energy density.
Description
Technical Field
The invention relates to the technical field of inductors, in particular to a manufacturing method of an inductor.
Background
In recent years, with the high-speed development of semiconductor devices, the demand for inductors has evolved toward high efficiency, low inductance, miniaturization, and high current; common inductors comprise integrated inductors and ferrite inductors, wherein the integrated inductors are widely applied in special fields such as automobiles, aerospace and the like except the traditional electric power related fields, and the requirements on the temperature resistance level and the magnetic permeability of the integrated inductors are higher and higher. At present, the manufacture of the integrated inductor generally requires magnetic powder and a coil, and the coil and the magnetic powder are pressed and packaged into a whole in a die, so that the inductor is formed; in the prior art, soft magnetic composite materials are generally adopted as magnetic powder, namely a mixture of the soft magnetic powder and resin, and resin materials are adopted as insulating layers of copper wires, so that the temperature resistance level of the inductor is only about 180 ℃, the magnetic powder has low magnetic permeability, the relative magnetic permeability is generally about 22-36, the energy density of the inductor is low, and the size of the inductor cannot be continuously reduced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the manufacturing method of the inductor can improve the temperature resistance level and the energy density while ensuring the small size of the inductor.
In order to solve the technical problems, the invention adopts a technical scheme that:
a method of manufacturing an inductor, comprising:
s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials;
s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product;
and S3, sintering and solidifying the semi-finished product to form the inductor.
The invention has the beneficial effects that: the method comprises the steps of respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, sequentially placing the preforming assemblies with the connecting positions into a die according to a preset sequence, connecting the connecting positions of adjacent preforming assemblies, pressing to form a semi-finished product, sintering and solidifying the semi-finished product to form the inductor, and not adopting a soft magnetic composite material as the magnetic powder in the prior art, adopting a hard magnetic material or a soft magnetic material as an insulating layer of the resin material outside a copper wire, adopting a guide sheet stacking mode to replace a coil, and adopting a high-pressure forming and high-temperature sintering mode to improve the energy density of the inductor, further improving the inductance value of the inductor, directly utilizing the magnetic powder to perform insulation and isolation between windings, improving the temperature resistance level of the inductor, and improving the temperature resistance level to more than 300 ℃ from 125-180 ℃, thereby ensuring the small size of the inductor and improving the temperature resistance level and the energy density.
Drawings
Fig. 1 is a flowchart illustrating steps of a method for manufacturing an inductor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a plurality of preformed assemblies with connection sites according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an external chip of an inductor manufacturing method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a semi-finished product of an inductor manufacturing method according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a semi-finished product of an inductor fabrication method according to an embodiment of the present invention;
description of the reference numerals:
1. magnetic powder; 2. a guide piece; 3. an outer tab; 4. preforming the assembly; 5. a terminal; 6. and (5) connecting the bits.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a method for manufacturing an inductor, including:
s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials;
s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product;
and S3, sintering and solidifying the semi-finished product to form the inductor.
From the above description, the beneficial effects of the invention are as follows: the method comprises the steps of respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, sequentially placing the preforming assemblies with the connecting positions into a die according to a preset sequence, connecting the connecting positions of adjacent preforming assemblies, pressing to form a semi-finished product, sintering and solidifying the semi-finished product to form the inductor, and not adopting a soft magnetic composite material as the magnetic powder in the prior art, adopting a hard magnetic material or a soft magnetic material as an insulating layer of the resin material outside a copper wire, adopting a guide sheet stacking mode to replace a coil, and adopting a high-pressure forming and high-temperature sintering mode to improve the energy density of the inductor, further improving the inductance value of the inductor, directly utilizing the magnetic powder to perform insulation and isolation between windings, improving the temperature resistance level of the inductor, and improving the temperature resistance level to more than 300 ℃ from 125-180 ℃, thereby ensuring the small size of the inductor and improving the temperature resistance level and the energy density.
Further, in the step S1, the steps of respectively placing the plurality of guide sheets into magnetic powder for preforming, and forming a plurality of preforming assemblies with connecting positions include:
and respectively connecting preset connecting pieces of the multi-layer guide sheet with the outer connecting pieces, then placing the connecting pieces into magnetic powder, and enabling the magnetic powder to cover the connecting surfaces of the guide sheet but not the outer connecting pieces and perform preforming to form a plurality of preforming assemblies with connecting positions.
According to the description, the preset connecting parts of the multi-layer guide sheets are respectively connected with the outer connecting sheets and then placed into the magnetic powder, so that the magnetic powder can conveniently keep away the outer connecting sheets on the connecting parts, and each layer of guide sheets can be connected together by using the connecting positions connected with the outer connecting sheets, so that a complete loop is formed, and the working performance of the inductor is ensured.
Further, in the step S1, the steps of respectively placing the plurality of guide sheets into magnetic powder for preforming, and forming a plurality of preforming assemblies with connecting positions include:
respectively placing the multilayer guide sheets into magnetic powder for preforming to obtain a plurality of preforming assemblies;
punching preset connection parts of the plurality of preformed assemblies to form a plurality of preformed assemblies with connection positions;
the step S2 comprises the following steps:
and sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of the adjacent preformed assemblies through copper column conductors to form a semi-finished product.
It can be seen from the above description that, besides connecting the preset connection portions of the plurality of guide sheets with the outer connection sheets, the preset connection portions of the plurality of preformed assemblies may be perforated to form a plurality of preformed assemblies with connection positions, and then the plurality of preformed assemblies with connection positions are sequentially placed into a mold according to a preset sequence and connected with the connection positions of the adjacent preformed assemblies through copper pillar conductors and then pressed, so that each guide sheet is connected together, thereby forming a complete loop and ensuring the working performance of the inductor.
Further, the guide piece is a bare copper piece, and the guide piece is in a U shape.
The above description shows that the guide piece is a bare copper sheet, and the guide piece is in an open-ended U-shape, so that a complete clockwise or anticlockwise circuit can be formed after the guide pieces are stacked, and the winding effect is achieved.
Further, the average particle diameter of the magnetic powder is 80 to 130 μm.
From the above description, the average particle diameter of the magnetic powder is 80-130 μm, so that the magnetic powder can be ensured to have better fluidity, and the consistency of the magnetic powder in filling is ensured; and the density of the magnetic powder with the grain diameter after pressing can be kept at 7g/cm 3 The powder filling efficiency and consistency are reduced because the compacting density is low due to the too coarse particle size and the poor fluidity due to the too fine particle size are avoided.
Further, in the step S1, the steps of respectively placing the plurality of guide sheets into the magnetic powder for preforming include:
and respectively placing the multilayer guide sheets in the middle positions of the magnetic powder for preforming.
From the above description, it can be seen that the middle positions of the magnetic powder are respectively placed into the multiple guide sheets, so that the thickness of the magnetic powder of the guide sheet between the layers is consistent after the subsequent multiple preformed assemblies are pressed, the magnetic powder of each guide sheet is better utilized to perform insulation isolation, short circuit of each guide sheet is prevented, meanwhile, the polymerization of the magnetic powder to the magnetic induction lines is ensured to be fully utilized, and the magnetic induction lines are not exposed more at one side due to deflection to one side, so that the induction value or saturation characteristic of the product is affected.
Further, the pressing pressure is 15-20T/cm 2 。
As can be seen from the above description, the pressing pressure is 15-20T/cm 2 The laminating effect can be ensured, and each layer of preformed assembly is laminated together, so that the quality of the inductor is ensured.
Further, the step S3 includes:
sintering and solidifying the semi-finished product in inert gas at a sintering temperature of 600 ℃ or higher to form the inductor.
From the above description, when the magnetic powder adopted is easy to oxidize, the semi-finished product is sintered and solidified in inert gas at the sintering temperature of above 600 ℃, so that the oxidation of the magnetic powder in the sintering process is prevented, and the inductance quality is ensured.
Further, the step S1 further includes:
when a first layer of guide sheets are placed into magnetic powder for preforming, one end of each first layer of guide sheets is exposed on the side surface of the magnetic powder;
and when the last layer of guide sheet is put into the magnetic powder for preforming, one end of the last layer of guide sheet is exposed at the side surface of the magnetic powder.
As is apparent from the above description, the guide piece is reserved at the side of the magnetic powder, so that the subsequent electroplating is facilitated, and the terminal electrode can be formed.
Further, the step S3 further includes:
s4, electroplating the one end of the first layer of guide piece and the one end of the last layer of guide piece to form a terminal.
As is apparent from the above description, the exposed guide piece is electroplated to form a terminal, and the inductor can be soldered on the circuit board by using the terminal, thereby realizing the operation performance of the inductor.
The method for manufacturing the inductor is applicable to manufacturing any inductor, and is described in the following by the specific embodiment:
example 1
Referring to fig. 1-5, a method for manufacturing an inductor according to the present embodiment includes:
s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials;
wherein, the guide piece is a bare copper piece and is in a shape of a U, as shown in fig. 2;
the number of layers of the guide sheet can be set according to actual needs, and the inductance value of the inductor formed subsequently is higher as the number of layers of the guide sheet is larger, in this embodiment, the number of layers of the guide sheet is 7;
the average particle diameter of the magnetic powder is 80-130 mu m, and the magnetic powder is iron powder, ferrosilicon aluminum or ferrite and the like;
specifically, the preset connecting surfaces of the multilayer guide sheets are respectively connected with the outer connecting sheets and then placed in the middle position of the magnetic powder, so that the magnetic powder covers the connecting surfaces of the guide sheets but does not cover the outer connecting sheets and is preformed to form a plurality of preformed assemblies with connecting positions, the connecting surfaces of the outer connecting sheets are connecting positions, as shown in fig. 5, and the connecting positions 6 in fig. 5 are connecting surfaces of the outer connecting sheets;
when a first layer of guide sheets are placed into magnetic powder for preforming, one end of each first layer of guide sheets is exposed on the side surface of the magnetic powder;
when the last layer of guide sheets are put into magnetic powder for preforming, one end of the last layer of guide sheets is exposed on the side surface of the magnetic powder, as shown in fig. 2;
wherein the preshaping pressure is 1-2T/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The preset connecting parts are positioned at one end or two ends of the guide piece, specifically, the preset connecting parts of the first layer of guide piece and the last layer of guide piece are positioned at one end or the other end of the first layer of guide piece and the last layer of guide piece, and the preset connecting parts of the middle layer of guide piece are positioned at two ends of the middle layer of guide piece, so that two adjacent guide pieces can be respectively connected after the outer connecting pieces are arranged; the external connection piece is a bare copper sheet like the guide piece, and the shape of the external connection piece is not the same as the guide pieceBy way of limitation, it may be rectangular, circular or polygonal, in this embodiment, the outer tab is circular in shape, as shown in fig. 3;
in an alternative embodiment, the preset connection parts of the multi-layer guide sheet are respectively connected with the outer connection sheets and then put into the middle position of the magnetic powder, so that the magnetic powder covers the connection surfaces of the guide sheet but does not cover the outer connection sheets and is 1T/cm 2 Preforming under pressure to form a plurality of preformed assemblies with connecting positions;
in another alternative embodiment, the preset connection parts of the multi-layer guide sheet are respectively connected with the outer connection sheets and then put in the middle position of the magnetic powder, so that the magnetic powder covers the connection surfaces of the guide sheet but does not cover the outer connection sheets and is 1.5T/cm 2 Preforming under pressure to form a plurality of preformed assemblies with connecting positions;
in another alternative embodiment, the preset connection parts of the multi-layer guide sheet are respectively connected with the outer connection sheets and then put into the middle position of the magnetic powder, so that the magnetic powder covers the connection surfaces of the guide sheet but does not cover the outer connection sheets and is at a speed of 2T/cm 2 Preforming under pressure to form a plurality of preformed assemblies with connecting positions;
s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product;
wherein the pressure of the pressing is 15-20T/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The preset sequence is rotated 90 degrees clockwise or rotated 90 degrees anticlockwise, and in this embodiment, the preset sequence is rotated 90 degrees anticlockwise;
specifically, as shown in fig. 2, 4 and 5, the preformed assemblies with the connecting positions are sequentially placed into a mold according to a anticlockwise rotation of 90 degrees and are pressed after being connected with the connecting positions of the adjacent preformed assemblies, so that a semi-finished product is formed, and each layer of guide sheets in the semi-finished product forms a complete circuit, thereby achieving the effect of windings;
in an alternative embodiment, the plurality of preform groups with connecting bitsThe combination is put into a mould in turn according to anticlockwise rotation of 90 degrees and is connected with the connecting position of the adjacent preformed combination body at 15T/cm 2 Pressing under pressure to form a semi-finished product;
in another alternative embodiment, the plurality of preformed assemblies with the connection sites are placed in a mold in sequence with a 90 degree counter-clockwise rotation and the connection sites adjacent the preformed assemblies are connected at 18T/cm 2 Pressing under pressure to form a semi-finished product;
in another alternative embodiment, the plurality of preformed assemblies with the connection sites are placed in a mold in sequence with a 90 degree counter-clockwise rotation and connected adjacent the connection sites of the preformed assemblies at 20T/cm 2 Pressing under pressure to form a semi-finished product;
s3, sintering and solidifying the semi-finished product to form an inductor;
specifically, sintering and solidifying the semi-finished product in inert gas at a sintering temperature of above 600 ℃ to form an inductor;
the sintering and solidifying process comprises heating, heat preservation and cooling for 2-4 hours, wherein the sintering and solidifying process can be specifically carried out according to the size of the product, the sintering time of the small-size product is short, and the sintering time of the large-size product is long;
the inert gas is helium, and helium can be introduced into a sintering furnace to sinter and solidify the semi-finished product at a sintering temperature of above 600 ℃;
in an alternative embodiment, the semi-finished product is sintered and cured in an inert gas at a sintering temperature of 600 ℃ for 4 hours to form an inductor;
in another alternative embodiment, the semi-finished product is sintered and cured in an inert gas at a sintering temperature of 700 ℃ for 3 hours to form an inductor;
in another alternative embodiment, the semi-finished product is sintered and cured in an inert gas at a sintering temperature of 800 ℃ for 2 hours to form an inductor;
when the magnetic powder is required to be oxidized, the magnet can be sintered and solidified without introducing inert gas;
s4, electroplating the one end of the first layer of guide piece and the one end of the last layer of guide piece to form a terminal;
after the terminals are formed, the inductor may be soldered to the circuit board through the terminals.
Example two
Referring to fig. 1 and 5, another way of forming a plurality of preformed assemblies with connection sites is provided in this embodiment, specifically:
s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials;
specifically, the multi-layer guide sheets are respectively placed in the middle positions of the magnetic powder for preforming, so that a plurality of preforming assemblies are obtained;
punching preset connection parts of the plurality of preformed assemblies to form a plurality of preformed assemblies with connection positions;
when a first layer of guide sheets are placed into magnetic powder for preforming, one end of each first layer of guide sheets is exposed on the side surface of the magnetic powder;
when the last layer of guide sheets are put into magnetic powder for preforming, one end of the last layer of guide sheets is exposed on the side surface of the magnetic powder;
the preset connecting parts are positioned at positions corresponding to one end or two ends of the guide piece, specifically, the preset connecting parts of the preformed assembly of the first layer and the preformed assembly of the last layer are positioned at positions corresponding to one end or the other end of the guide piece in the preformed assembly of the first layer and the guide piece in the preformed assembly of the last layer, and the preset connecting parts of the preformed assembly of the middle layer are positioned at positions corresponding to two ends of the guide piece in the preformed assembly of the middle layer; the punching is not performed on the guide sheet, but is performed on the preformed assembly after the preforming;
s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product;
specifically, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies through copper column conductors to form a semi-finished product;
wherein the preset sequence is rotated 90 ° clockwise or rotated 90 ° counterclockwise, in this embodiment, rotated 90 ° counterclockwise;
specifically, the plurality of preformed assemblies with the connecting positions are sequentially placed into a die according to anticlockwise rotation by 90 degrees, and are pressed after being connected with the connecting positions of the adjacent preformed assemblies through copper column conductors, so that a semi-finished product is formed, and each layer of guide sheets in the semi-finished product form a complete circuit, thereby achieving the effect of windings;
as shown in fig. 5, the connection site 6 in fig. 5 may be formed by punching the preform assembly and then placing a copper pillar conductor, if not by connecting the outer tab with the guide piece.
In summary, in the method for manufacturing the inductor provided by the invention, the plurality of layers of guide sheets are respectively placed into the magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, when the magnetic powder is made of hard magnetic material or soft magnetic material to form a plurality of preforming assemblies with connecting positions, the preset connecting positions of the plurality of layers of guide sheets are respectively connected with the outer connecting sheets and then placed into the magnetic powder, so that the magnetic powder can keep the outer connecting sheets on the connecting parts away, each layer of guide sheets can be connected together by utilizing the connecting positions connected with the outer connecting sheets, or the preset connecting parts of the preforming assemblies are perforated to form a plurality of preforming assemblies with the connecting positions, and then the preforming assemblies with the connecting positions are sequentially placed into a die according to a preset sequence and are connected with the connecting positions of the adjacent preforming assemblies through copper column conductors and then pressed, so that each layer of guide sheets are connected together, and the working performance of the inductor is ensured; sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product; sintering and solidifying the semi-finished product to form an inductor; the magnetic powder is made of hard magnetic material or soft magnetic material, the coil is replaced by stacking the guide plates, and the high-pressure forming and high-temperature sintering are matched, so that the energy density of the inductor is improved, the inductance value of the inductor is further improved, no insulating layer exists outside the guide plates, the insulating isolation between windings is directly carried out by using the magnetic powder, the temperature resistance grade of the inductor is improved, and the temperature resistance grade is improved to be more than 300 ℃ from 125-180 ℃, so that the small size of the inductor is ensured, and meanwhile, the temperature resistance grade and the energy density are improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (8)
1. A method of manufacturing an inductor, comprising:
s1, respectively placing the multilayer guide sheets into magnetic powder for preforming to form a plurality of preforming assemblies with connecting positions, wherein the magnetic powder is made of hard magnetic materials or soft magnetic materials;
s2, sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of adjacent preformed assemblies to form a semi-finished product;
s3, sintering and solidifying the semi-finished product to form an inductor;
the pressing pressure is 15-20T/cm 2 ；
The step S3 comprises the following steps:
sintering and solidifying the semi-finished product in inert gas at a sintering temperature of above 600 ℃ to form an inductor;
the outside of the guide sheet is not provided with an insulating layer.
2. The method for manufacturing an inductor according to claim 1, wherein the step of S1 of placing the plurality of guide sheets into magnetic powder for preforming, respectively, to form a plurality of preformed assemblies with connection sites comprises:
and respectively connecting preset connecting pieces of the multi-layer guide sheet with the outer connecting pieces, then placing the connecting pieces into magnetic powder, and enabling the magnetic powder to cover the connecting surfaces of the guide sheet but not the outer connecting pieces and perform preforming to form a plurality of preforming assemblies with connecting positions.
3. The method for manufacturing an inductor according to claim 1, wherein the step of S1 of placing the plurality of guide sheets into magnetic powder for preforming, respectively, to form a plurality of preformed assemblies with connection sites comprises:
respectively placing the multilayer guide sheets into magnetic powder for preforming to obtain a plurality of preforming assemblies;
punching preset connection parts of the plurality of preformed assemblies to form a plurality of preformed assemblies with connection positions;
the step S2 comprises the following steps:
and sequentially placing the preformed assembly with the connecting positions into a die according to a preset sequence, and pressing after connecting the connecting positions of the adjacent preformed assemblies through copper column conductors to form a semi-finished product.
4. The method of claim 1, wherein the guide piece is a bare copper piece and is in a shape of a "n".
5. The method of claim 1, wherein the average particle size of the magnetic powder is 80-130 μm.
6. The method for manufacturing an inductor according to claim 1, wherein the step of S1 of placing the plurality of guide pieces into the magnetic powder for preforming comprises:
and respectively placing the multilayer guide sheets in the middle positions of the magnetic powder for preforming.
7. The method for manufacturing an inductor according to claim 1, wherein S1 further comprises:
when a first layer of guide sheets are placed into magnetic powder for preforming, one end of each first layer of guide sheets is exposed on the side surface of the magnetic powder;
and when the last layer of guide sheet is put into the magnetic powder for preforming, one end of the last layer of guide sheet is exposed at the side surface of the magnetic powder.
8. The method for manufacturing an inductor according to claim 7, wherein the step S3 further comprises:
s4, electroplating the one end of the first layer of guide piece and the one end of the last layer of guide piece to form a terminal.
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| KR101659206B1 (en) * | 2015-01-30 | 2016-09-22 | 삼성전기주식회사 | Power inductor |
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