CN106024359B - A kind of production method for being molded inductance - Google Patents
A kind of production method for being molded inductance Download PDFInfo
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- CN106024359B CN106024359B CN201610495484.0A CN201610495484A CN106024359B CN 106024359 B CN106024359 B CN 106024359B CN 201610495484 A CN201610495484 A CN 201610495484A CN 106024359 B CN106024359 B CN 106024359B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000006247 magnetic powder Substances 0.000 claims abstract description 80
- 238000000465 moulding Methods 0.000 claims abstract description 53
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 239000002904 solvent Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims abstract 2
- 239000007924 injection Substances 0.000 claims abstract 2
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 description 22
- 239000000047 product Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- YSUQLAYJZDEMOT-UHFFFAOYSA-N 2-(butoxymethyl)oxirane Chemical group CCCCOCC1CO1 YSUQLAYJZDEMOT-UHFFFAOYSA-N 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000009747 press moulding Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- 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
- H01F41/041—Printed circuit coils
- H01F41/046—Printed circuit coils structurally combined with ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a kind of production methods for being molded inductance, include the following steps：S1, magnetic powder slurry is made：Magnetic powder, adhesive and solvent by predetermined ratio are mixed, form magnetic powder slurry；S2, compacting：By in the magnetic powder slurry injection mold obtained by step S1, be previously placed in mold coil, suppressed together with magnetic core so that at least part solvent and at least part adhesive in magnetic powder slurry are overflowed from mold, form a molding green body for having predetermined shape；S3, it is heating and curing：It is heating and curing to the molding green body obtained by step S2, obtains a molding blank；S4, termination electrode is made：To the molding blank progress appearance shaping obtained by step S3 so that extraction electrode is exposed to except the molding blank, and makes termination electrode, the molding inductance is obtained.
Description
Technical field
The present invention relates to the production methods of molding inductance.
Background technology
Existing electronic product function is stronger and stronger, necessarily causes electric current of the electronic product in application increasing,
This proposes higher current requirements to the power supply circuit part of product, to meet higher and higher supply current demand, power
The manufacturing technology of inductance is also being continuously improved, and is integrally formed from coiling to molding, is completed the upgrading of moulding process.
Current molding integral forming process is dry powder press moulding mode, is had some limitations：1) dry powder molding is used
Pelletizing typically contain 10% or so adhesive so that the magnetic conductivity of product is relatively low after molding, and in order to improve magnetic conductivity,
Molding pressure (up to 1200~1800MPa) would generally be increased；2) in molding, there are compressible gap between powder, but
It can there are relative motion, powders between powder and coil when cannot but be compressed around the coil made in advance, therefore leading to molding
Can rub copper wire, and the insulating layer for being easy to cause copper wire is damaged, and copper wire is understood compressive deformation or broken when serious, and there are reliabilities for product
Hidden danger；3) excessively high molding pressure can also damage coil and mold simultaneously, shorten the service life of mold.
Invention content
It is a primary object of the present invention to propose a kind of production method for being molded inductance, by the way that main body magnetic powder is made as starching
Material form is suppressed, and solves that powder gap existing for existing dry powder mould pressing process is big, magnetic conductivity is relatively low and to improve magnetic
Conductance and the technical issues of larger molding pressure cause coil covering to be destroyed, mold is impaired need to be used.
The technical solution that the present invention is provided for the above-mentioned purpose is as follows：
A kind of production method for being molded inductance, includes the following steps：
S1, magnetic powder slurry is made：Magnetic powder, adhesive and solvent by predetermined ratio are mixed, form magnetic powder slurry；
S2, compacting：Magnetic powder slurry obtained by step S1 is injected in mold, with coil, the magnetic core being previously placed in mold
It is suppressed together, so that at least part solvent and at least part adhesive in magnetic powder slurry are overflowed from mold, forms a tool
The molding green body of standby predetermined shape；
S3, it is heating and curing：It is heating and curing to the molding green body obtained by step S2, obtains a molding blank；
S4, termination electrode is made：Appearance shaping is carried out to the molding blank obtained by step S3 so that extraction electrode is exposed to institute
It states except molding blank, and makes termination electrode, obtain the molding inductance.
Above-mentioned production method provided by the invention compared with existing dry powder is molded manufacture craft, at least has with following
Beneficial effect：Liquid phase ingredient present in slurry plays the role of lubrication and pressure transmission when being molded (i.e. step S2), therefore
Relatively low molding pressure (generally can be down to 600MPa) may be used during molding to reach than existing dry powder mould pressing process higher
Magnet density (up to 6.3~6.5g/cm3), higher magnetic conductivity, in addition use high temperature sintering be molded high magnetic permeability magnetic
Core can cause the Effective permeability of final molding inductance to be promoted to 40~55, far above existing dry powder molding inductance
Effective permeability (28~30), and the magnet density of existing dry powder molding inductance is only 5.8~6.0g/cm3；Meanwhile it is molded
Pressure uniformly transfers, it is ensured that coil will not deform due to unbalance stress, is damaged, so as to which molding inductance be avoided often to occur
The short circuit problem caused by coil covering breakage.Promotion based on magnetic conductivity, under the design of identical inductances amount, the present invention
The DCR (D.C. resistance) of molding inductance prepared can decline to a great extent, and under high current application, can effectively reduce the work(of product
Rate is lost.
Preferably, in the magnetic powder slurry that step S1 makes, the mass percent of magnetic powder is more than 90%, also, with quality
Number meter, the ratio of magnetic powder, adhesive and solvent three is 100:3~5:4~8.
Preferably, in terms of mass fraction, the ratio of magnetic powder, adhesive and solvent three is 100:3~4:4~6.
Preferably, anti-settling agent, auxiliary rheological agents and dispersant are additionally added when step S1 makes magnetic powder slurry.
Preferably, the magnetic powder is ferroalloy magnetic powder, and the adhesive is thermosetting resin, and the solvent is may participate in
State the active solvent or diluent of the curing molding reaction of thermosetting resin.
Preferably, pressure is 600~800MPa used by being suppressed in step S2, and the maximum pressure in compacting
Lower carry out pressurize, to obtain the molding green body.
Preferably, the time that pressurize is carried out in step S2 is 10~15 seconds.
Preferably, the magnetic powder in step S1 includes two kinds by grain size：First grain-size grade magnetic powder and the second grain-size grade magnetic powder, the
The average grain diameter of one grain-size grade magnetic powder is 10 times or more of the average grain diameter of the second grain-size grade magnetic powder；Also, the second grain-size grade magnetic
The dosage of powder is the 10~20% of magnetic powder gross mass.Based on the magnetic powder of greater particle size, the smaller fine powder of addition grain size (second
Diameter grade magnetic powder), the bulk density of powder can be increased, improve final product magnetic conductivity.
Preferably, the viscosity for the magnetic powder slurry that step S1 makes is 6500~11000cp.
Specific embodiment
With reference to specific embodiment and embodiment, the invention will be further described.
The specific embodiment of the present invention provides a kind of production method for being molded inductance, includes the following steps S1~S4：
S1, magnetic powder slurry is made：Magnetic powder, adhesive and solvent by predetermined ratio are mixed, form magnetic powder slurry.In the magnetic
In slurry material, the mass percent of magnetic powder is preferably more than 90%, also, in terms of mass fraction, magnetic powder, adhesive and solvent three
The ratio of person is 100:3~5:4~8, i.e., can add in every 100 parts of magnetic powders 3~5 parts adhesive and 4~8 parts molten
Agent.It is further preferred that in every 100 parts of magnetic powders add 3~4 parts adhesive and 4~6 parts of solvent.In addition, in some realities
It applies in example, the auxiliary agents such as anti-settling agent, auxiliary rheological agents and/or dispersant can also be added in make the magnetic powder slurry.It is preferred that
Ground：In this step, magnetic powder used includes two kinds：First grain-size grade magnetic powder and the second grain-size grade magnetic powder, the first grain-size grade magnetic
The average grain diameter of powder (can be described as thick magnetic powder below) is the average grain diameter of the second grain-size grade magnetic powder (can be described as thin magnetic powder below)
10 times or more；Also, the dosage of the second grain-size grade magnetic powder is the 10~20% of magnetic powder gross mass.
S2, compacting：Magnetic powder slurry obtained by step S1 is injected in mold, with the coil (coil being previously placed in mold
Can be pre-welded on lead frame), magnetic core (T-shaped or I types or other shapes all can) suppressed together so that magnetic powder is starched
At least part solvent and at least part adhesive in material are overflowed from mold, form a molding green body for having predetermined shape.
In this step, contained solvent can be largely extruded in magnetic powder slurry, at the same also having of being extruded be dissolved in solvent not by
The part adhesive of magnetic powder absorption, gap or the excessive glue channel specially designed can be coordinated through mold by being overflowed from mold.This step
In when being suppressed used molding pressure be 600~800MPa, in compacting, pressure constantly increases, and boosting need to be controlled (to refer to
Pressure) speed, and pressurize is carried out in maximum pressure.
S3, it is heating and curing：It is heating and curing to the molding green body obtained by step S2, obtains a molding blank.Specifically,
Molding green body is subjected to heat temperature raising, so that the adhesive in the molding green body is cured with solvent and reacts.It uses herein
Adhesive be specifically thermosetting resin, the only smaller volume contraction in curing is unlikely to allow molding green body being solidified into
It is deformed after type, such as single-component thermosetting type epoxy resin may be used, but not limited to this, solidification temperature is generally epoxy resin
120~150 DEG C of common curing temperature range.
S4, termination electrode is made：Appearance shaping is carried out to the molding blank obtained by step S3 so that extraction electrode is exposed to institute
It states except molding blank, and makes termination electrode, obtain the molding inductance.
The principle of the present invention and effect are further described below by specific embodiment and comparative example.
Table 1：The raw material components and its mass fraction of the magnetic powder slurry of each embodiment
In table 1 above, thick magnetic powder is specifically the ferroalloy magnetic powder of 20 μm of average grain diameter, and thin magnetic powder is specifically average grain diameter
2 μm of ferroalloy magnetic powder, adhesive are epoxy resin, and solvent is tertiary butyl glycidyl ether.
It is corresponding to obtain product ginseng as shown in table 2 below according to abovementioned steps S1~S4 according to the raw material proportioning of above-mentioned table 1
Number：
Table 2
From embodiment 3 the data of Tables 1 and 2 can be seen that when magnetic powder all using thick magnetic powder when, magnet density and magnetic
Conductance is declined compared with other are equipped with the embodiment of a small amount of thin magnetic powder, it is seen that is added in a certain amount of thin magnetic powder, can be increased
The bulk density of powder, so that the magnet density and magnetic conductivity of product are promoted.
Comparative example --- molding inductance is prepared using existing dry powder mould pressing process, it is as follows：
Using the magnetic powder (i.e. thick 85 parts of magnetic powder, 15 parts of thin magnetic powder) of dosage same as Example 4, add in gluing agent solution and fill
Point mixing, is granulated, containing adhesive is about 8.5% in the magnetic powder mixture after granulation, obtains having mobility after drying
Dry powder particle is filled into the mold identical with previous embodiment and suppresses by dry powder particle, in two kinds of situation, is respectively adopted
The pressure of 1200MPa, 1800MPa are suppressed, and two obtained kind sample blank density (i.e. the magnet density of product) is respectively
5.6g/cm3、5.75g/cm3, magnetic conductivity is respectively 26,28.As known from compared to Example 4, the prior art is even with larger
Molding pressure, but obtained product is compared with the product prepared by the preparation method of the present invention, magnet density and magnetic conductivity still compared with
It is small.
It was found from the Experimental comparison of embodiment and comparative example：It is of the invention compared with existing dry powder is molded manufacture craft
Preparation method, no matter using which kind of raw material proportioning, the magnet density and magnetic conductivity of obtained product are all far above existing dry powder
The product prepared by preparation process is molded, because liquid phase ingredient present in slurry plays lubrication when being molded (i.e. step S2)
With the effect of pressure transmission, therefore while being molded relatively low molding pressure (generally can be down to 600MPa) may be used to reach than existing
The some higher magnet density of dry powder mould pressing process (up to 6.3~6.5g/cm3), higher magnetic conductivity (40~55).Same
In the case of the coil design of sample, the method for the present invention, which prepares product, will have higher inductance value, in other words, in identical inductance value
Under it is required that, less number of coils may be used in the present invention, so as to reduce the DCR of product.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those skilled in the art to which the present invention belongs, it is not taking off
Under the premise of from present inventive concept, several equivalent substitute or obvious modifications can also be made, and performance or use is identical, all should
When being considered as belonging to protection scope of the present invention.
Claims (8)
1. a kind of production method for being molded inductance, it is characterised in that：Include the following steps：
S1, magnetic powder slurry is made：Magnetic powder, adhesive and solvent by predetermined ratio are mixed, form magnetic powder slurry；
S2, compacting：By in the magnetic powder slurry injection mold obtained by step S1, be previously placed in mold coil, together with magnetic core
It is suppressed, so that at least part solvent and at least part adhesive in magnetic powder slurry are overflowed from mold, formation one has pre-
The molding green body of setting shape；Pressure is 600~800MPa used by being suppressed, and is carried out under the maximum pressure in compacting
Pressurize, to obtain the molding green body；
S3, it is heating and curing：It is heating and curing to the molding green body obtained by step S2, obtains a molding blank；The heating is solid
Change and include that green body progress heat temperature raising will be molded, so that the adhesive in the molding green body is cured with solvent and reacts；
S4, termination electrode is made：To obtained by step S3 molding blank carry out appearance shaping so that extraction electrode be exposed to it is described into
Except parison body, and termination electrode is made, obtain the molding inductance.
2. production method as described in claim 1, it is characterised in that：In the magnetic powder slurry that step S1 makes, the quality of magnetic powder
Percentage is more than 90%, also, in terms of mass fraction, and the ratio of magnetic powder, adhesive and solvent three is 100:3~5:4~
8。
3. production method as claimed in claim 2, it is characterised in that：In terms of mass fraction, magnetic powder, adhesive and solvent three
Ratio be 100:3~4:4~6.
4. production method as claimed in claim 2, it is characterised in that：Step S1 make magnetic powder slurry when be additionally added anti-settling agent,
Auxiliary rheological agents and dispersant.
5. production method as claimed in claim 4, it is characterised in that：The magnetic powder is ferroalloy magnetic powder, and the adhesive is
Thermosetting resin, the solvent are the active solvent or diluent for the curing molding reaction that may participate in the thermosetting resin.
6. production method as described in claim 1, it is characterised in that：The time that pressurize is carried out in step S2 is 10~15 seconds.
7. production method as described in claim 1, it is characterised in that：Magnetic powder in step S1 includes two kinds by grain size：First
Grain-size grade magnetic powder and the second grain-size grade magnetic powder, the average grain diameter of the first grain-size grade magnetic powder are the average grain diameters of the second grain-size grade magnetic powder
10 times or more；Also, the dosage of the second grain-size grade magnetic powder is the 10~20% of magnetic powder gross mass.
8. production method as described in claim 1, it is characterised in that：The viscosity for the magnetic powder slurry that step S1 makes for 6500~
11000cp。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610495484.0A CN106024359B (en) | 2016-06-29 | 2016-06-29 | A kind of production method for being molded inductance |
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| CN201610495484.0A CN106024359B (en) | 2016-06-29 | 2016-06-29 | A kind of production method for being molded inductance |
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| CN106024359B true CN106024359B (en) | 2018-07-03 |
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| JP7081667B2 (en) * | 2018-07-25 | 2022-06-07 | 味の素株式会社 | Magnetic paste |
| CN110828104A (en) * | 2019-10-23 | 2020-02-21 | 上海太朔材料技术有限公司 | Moulded inductor made of aqueous epoxy resin and manufacturing process thereof |
| TW202239616A (en) * | 2021-03-26 | 2022-10-16 | 日商太陽油墨製造股份有限公司 | Curable resin composition |
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| TW200919499A (en) * | 2007-10-18 | 2009-05-01 | Trio Technology Co Ltd | A method for fabricating a molding coil structure and a molding coil structure |
| TW200941515A (en) * | 2008-03-17 | 2009-10-01 | Cyntec Co Ltd | Inductor and method for making thereof |
| EP2211358A3 (en) * | 2009-01-22 | 2012-09-05 | NGK Insulators, Ltd. | A method for manufaturing a fired ceramic body including a metallic wire inside |
| KR20140079007A (en) * | 2012-12-18 | 2014-06-26 | 삼성전기주식회사 | Method of manufacturing coil |
| US9087634B2 (en) * | 2013-03-14 | 2015-07-21 | Sumida Corporation | Method for manufacturing electronic component with coil |
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