CN102810386A - Combined type magnetic core and preparation method thereof - Google Patents
Combined type magnetic core and preparation method thereof Download PDFInfo
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- CN102810386A CN102810386A CN2011101437214A CN201110143721A CN102810386A CN 102810386 A CN102810386 A CN 102810386A CN 2011101437214 A CN2011101437214 A CN 2011101437214A CN 201110143721 A CN201110143721 A CN 201110143721A CN 102810386 A CN102810386 A CN 102810386A
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Abstract
The invention provides a combined type magnetic core and a preparation method thereof. The method comprises the following steps: firstly, mixing powdery magnetic materials and a powdery adhesive agent in a presetting proportion so as to form a solid mixture; secondly, putting a column-shaped core material into a column-shaped holding mold of a mould; filling the mixture into the upper and the lower ends of the mould respectively so as to form a mold, or putting the mixture, an annular core material and the mixture into another mould in sequence; and subsequently, heating the mould or the solid mixture in another mould to enable the powdery magnetic materials to be mutually bonded through the powdery adhesive agent so as to be shaped at two ends of the column-shaped core material, or enable the powdery magnetic materials to be mutually bonded through the powdery adhesive agent so as to be wrapped outside the whole annular core material coaxially and form a through holes around the axis of the annular core material. Therefore, with the adoption of the preparation method, the magnetic cores containing more than two materials can be produced.
Description
Technical field
The present invention relates to a kind of combined type magnetic core and preparation method thereof, relate in particular to a kind of combined type magnetic core that is applied to inductor, transformer or filter and preparation method thereof.
Background technology
Magnetic core can be used for inductor, filter or the transformer etc. in the various electronic equipments.The mode of making magnetic core at present roughly has powder compaction processing procedure or two kinds of technology of magnetic colloid processing procedure.
With the powder compaction processing procedure, through HTHP pulverulent material is compressed to magnetic core, magnetic core 1 as shown in Figure 1.Its manufacture method is earlier Magnaglo to be inserted mould, again mould is applied a big pressure with Magnaglo compression moulding, still, can provide the process apparatus of immense pressure very high with the cost of the mould that can bear immense pressure.In addition, when upper end 11 needs with number of various materials with columnar part 12, certainly will, 11 make columnar part 12 earlier before being formed at an end of columnar part 12 in the upper end.Yet the powder compaction technology is only applicable to a kind of material usually, because when utilizing another kind of forming materials, huge pressure potential must crush columnar part 12 to cracked, and then influences the electromagnetic property of the magnetic core of made.
And for example when making the inductor of toroidal core; Often need on toroidal core, to offer a breach; Can make inductor that preferable inductance characteristic is arranged like this; But the magnetic line of force also exposes via this breach, cause eddy current loss, magnetic resistance to rise, reach permeability and descend, and to the electromagnetic interference of electronic component generation on every side.Settling mode in the past is for wrapping up this toroidal core through a cladding; For avoiding the cracked problem of magnetic core to adopt magnetic colloid to make; Promptly earlier toroidal core is put into mould, utilize the colloid that is mixed with Magnaglo to fill mould again, treat that high-temperature baking is afterwards promptly plastic.
Yet the colloid that is mixed with Magnaglo is prone in colloid, produce bubble when filling mould, is difficult to make mould to become vacuum.In addition, Magnaglo is bigger with respect to colloid proportion, in colloid, can produce sedimentation phenomenon, causes made cladding magnetic skewness.
Therefore, prior art awaits improving and development.
Summary of the invention
Deficiency in view of above-mentioned prior art the object of the present invention is to provide a kind of combined type magnetic core and preparation method thereof, can produce to have the combined type magnetic core that two or more materials are applied to inductor, transformer or filter.
For achieving the above object and other purposes, the present invention proposes a kind of combined type magnetic core, comprises: columnar part; And upper end and bottom, it is formed at the two ends of said columnar part respectively, and wherein, one of them is to be formed with the mixture made that a preset ratio mixes by powdered magnetic material and powdery adhesive agent at least in said upper end and this bottom.
In addition, the present invention propose a kind of combined type magnetic core manufacture method, be used to make the column core, may further comprise the steps: A1, a mould is provided, and said mould has column and keeps mould and be connected in this column keeping the upper and lower end at mould two ends to form mould; B1, mix powdered magnetic material and powdery adhesive agent to form mixture with a default scale, the column that this column core is put in said mould keeps in the mould, and the upper and lower end that this mixture is filled in said mould is respectively formed mould; And C1, heating are filled in the mixture in the said mould, the two ends that make said powdered magnetic material cohere and form in this column core each other through said powdery adhesive agent.
Secondly, the present invention also proposes a kind of combined type magnetic core, comprises: core, and it is for annular and have a breach; Cladding is coated on said core axle center whole and the said core in edge coaxially and is formed with the hole that runs through, and said cladding is formed by the mixture made that powdered magnetic material and powdery adhesive agent mix with a preset ratio.
Moreover the also corresponding method for making that proposes a kind of toroidal core of the present invention is used to make the annular core with breach, may further comprise the steps: A2, mix powdered magnetic material and the powdery adhesive agent forms mixture with a preset ratio; B2 carries out in regular turn in mould and fills this mixture, puts into this annular core, reaches the step of filling said mixture once more, so that this mixture coats said core integral body; C2, heating are filled in the mixture in the said mould, coat should the annular core wholely coaxially so that said powdered magnetic material coheres through said powdery adhesive agent each other, and are formed with the hole that runs through along the axle center of this annular core.
With respect to prior art, combined type magnetic core of the present invention and preparation method thereof has solved the cracked problem of magnetic core of utilizing the powder compaction technology to be caused in the prior art, and avoids utilizing magnetic colloid to fill bubble and the uneven phenomenon of magnetic that mould caused.
Description of drawings
Fig. 1 is the structure chart of prior art magnetic core.
Fig. 2 A is the structure chart of combined type magnetic core first embodiment of the present invention.
The structure chart that Fig. 2 B changes for combined type magnetic core first embodiment of the present invention.
Fig. 3 A is the flow chart of first embodiment of combined type magnetic core manufacture method of the present invention.
Fig. 3 B is the key diagram of first embodiment of combined type magnetic core manufacture method of the present invention.
Fig. 4 is the structure chart of second embodiment of combined type magnetic core of the present invention.
Fig. 5 A is the flow chart of second embodiment of the manufacture method of combined type magnetic core of the present invention.
Fig. 5 B is the key diagram of second embodiment of the manufacture method of combined type magnetic core of the present invention.
Embodiment
The present invention provides a kind of combined type magnetic core and preparation method thereof, and is clearer, clear and definite for making the object of the invention, technical scheme and effect, below with reference to accompanying drawing and give an actual example to further explain of the present invention.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
First embodiment
See also Fig. 2 A.Magnetic core 2 comprises upper end 21, columnar part 22 and bottom 23; Wherein, Upper end 21 and bottom 23 are formed at the two ends of columnar part 22; And the sectional area of vertical columnar part 22 bearing of trends of upper end 21 and bottom 23 can form the magnetic core of similar Chinese " worker " or English " I " font greater than the sectional area of columnar part 22 vertical its bearing of trends.
One of them can be made with the composite mixture of a preset ratio by powdered magnetic material and powdery adhesive agent at least in upper end 21 and the bottom 23, and is formed at the two ends of columnar part 22.Shown in Fig. 2 A, the upper end of magnetic core 2 21 is processed by mixture, and sees through heating and gluing is formed at an end of columnar part 22.Perhaps, bottom 23 also can be processed by mixture, and gluing is formed at the other end of columnar part 22 through heating.
Moreover columnar part 22 also can be made with the mixture that another preset ratio mixes by another powdered magnetic material and another powdery adhesive agent.Therefore, columnar part 22 can have different permeabilities with upper end 21 or bottom 23.In addition, can be mixed with powder insulation material in the mixture, silicon dioxide for example is to increase the solidity by the made magnetic core 2 of mixture.
In addition; The powdery Magnaglo can be the soft magnetism material; For example: iron (Fe), iron sial (MPP (FeNiMo)/hi-flux (FeNi50)), iron sial (sendust:FeSiAl), ferrous salt (Ferrite), carbonyl iron (carbonyl iron) etc., the powdery adhesive agent can be solid resin.Secondly; Heating process can be set at temperature 100
C; Time is two hours, and mixture for example can be 90% iron powder and 10% the mixture that powdered resin mixed.And the preset ratio of iron powder and powdered resin also can be adjusted to 85% and 15% or 80% and 20% ratio.When the combined type magnetic core is applied to inductor, can be according to the required required preset ratio of inductance characteristic adjustment.
See also Fig. 2 B; The upper end 21 ' of magnetic core 2 ' and bottom 23 ' are all adopted by powdered magnetic material and powdery adhesive agent made with the mixture that a preset ratio mixes; But; The powdered magnetic material that upper end 21 ' comprised, powdery adhesive agent, and the preset ratio of mixing of powdered magnetic material and powdery adhesive agent; Can be different from powdered magnetic material that bottom 23 ' comprises, powdery adhesive agent, and the preset ratio of mixing of powdered magnetic material and powdery adhesive agent, make upper end 21 ', columnar part 22 ' and the bottom 23 ' of magnetic core can have three kinds of different permeabilities.
Embodiment by shown in above-mentioned Fig. 2 A and Fig. 2 B can know; In upper end, columnar part and the bottom that combined type magnetic core of the present invention is had at least one of them; Can form by powdered magnetic material and the composite mixture of powdery adhesive agent, make magnetic core can have two or more materials.
In addition, because adhesive agent used in the present invention is a powdery, the powdery adhesive agent need not the high pressure compacting can make powdered magnetic material cohere each other, and is bonded together with columnar part, thereby has solved the oppressed cracked problem of columnar part described in the prior art.
Then see also Fig. 3 A and Fig. 3 B, it is respectively preparation flow chart and the key diagram of first embodiment of combined type magnetic core of the present invention.The manufacture method of combined type magnetic core of the present invention is applied to one and has the mould that column keeps mould and is connected in the upper and lower end formation mould at these column maintenance mould two ends.
At first in step S301, mix powdered magnetic material 30 and powdery adhesive agent 31, to form mixture 3 with a preset ratio.Secondly in step S302, with a column core 22 ' ' column of putting into this mould 4 keeps mould 42, and the upper and lower end that said mixture 3 is filled in said mould 4 is respectively formed mould 41,43.In step S303, heat at last, form in this column core 22 ' ' two ends 3 ', thereby form combined type magnetic core 2 ' ' so that said powdered magnetic material 30 coheres through said powdery adhesive agent 31 each other.
In addition, in step S303, can shake said mould 4 so that said mixture 3 evenly mixes before the heating.In step S303, can be during heating through a pressure so that said mixture 3 even fillings in the said mould 4.What need explanation is, this pressure is merely a light pressure (normal pressure or low pressure), if do not apply this light pressure, this magnetic core is still plastic after heat.
In addition, being filled in the upper end forms mixture that mould 41 and lower end form mould 43 and can use different powdered magnetic materials, different powdery adhesive agent, reach different mixed proportions.
Method by shown in above-mentioned Fig. 3 A and Fig. 3 B can be known; Fill mould with the mixture that is mixed with powdery adhesive agent and powdered magnetic material and form magnetic core, bubble and powder sedimentation phenomenon in the past that caused in the time of can avoiding utilizing the colloid that is mixed with Magnaglo to fill mould.
Second embodiment
See also Fig. 4, the cladding 52 that magnetic core 5 comprises core 51 and coats core 51, core 51 is for annular and have hollow bulb 510, and core 51 has breach 511.Cladding 52 is made by the mixture that is mixed with powdered magnetic material and powdery adhesive agent, and cladding 52 coats cores 51 and is formed with the hole 520 that runs through at the hollow bulb 510 of core 51.That is to say that it is whole and be formed with the hole 520 that runs through along the axle center of core 51 that cladding 52 is coated on core 51 coaxially.
On (annular) core 51, offer the B-H loop that breach 511 can change core 51; Utilization has breach 511 (annular) core 51 to be made inductors and can obtain preferable inductance characteristic, but the magnetic line of force can expose at breach 511 places and causes vortex flow loss, magnetic resistance to rise and permeability descends.The cladding 52 of the mixture through being mixed with powdered magnetic material and powdery adhesive agent coats core 51, can avoid the magnetic line of force to expose and and then lowers electromagnetic interference.
In addition; Core 51 can be ferrite (like manganese-zinc ferrite or nickel-Zn ferrite) or ferromagnetic substance (like cobalt or iron); Powdered magnetic material can be the soft magnetism material; The powdery adhesive agent can be powdered resin, and powdered magnetic material and powdery adhesive agent are uniformly mixed into said mixture with a preset ratio.In addition, also can mix in the mixture powder insulation material (for example: silicon dioxide), to increase the solidity of cladding.Therefore, core 51 and comprise the cladding 52 that is mixed with the powdered magnetic material and the mixture of powdery adhesive agent and can have different permeabilities.
Then consult Fig. 5 A and Fig. 5 B, it is manufacture method flow chart and the key diagram of second embodiment of combined type magnetic core of the present invention.In step S701, earlier powdered magnetic material 60 and powdery adhesive agent 61 are uniformly mixed into mixture 6 with a preset ratio.Then in step S702; In mould 7, carry out to fill said mixture 6 in regular turn, put into annular core 51 ', and fill the step of said mixture 6 once more; So that said mixture 6 coat should annular core 51 ' integral body, wherein, mould 7 is for having the ring mould of hole shaping mould 70.In step S703; Heat;, this powdered magnetic material 60 is coated on said annular core 51 ' integral body coaxially so that cohering through this powdery adhesive agent 61 each other; And form hole 520 ' at the hollow bulb of said annular core 51 ', promptly the axle center along said annular core 51 ' is formed with the hole 520 ' that runs through, thereby forms said toroidal core 5 '.In addition, can shake said mould 7 so that said mixture 6 evenly mixes before the heating.Also have, can pass through a pressure (normal pressure or low pressure) during heating so that said mixture 6 is evenly filled said mould 7.Because powdery adhesive agent 61 itself has stickiness; Thereby can powdered magnetic material 60 be cohered each other; And make by powdered magnetic material 60 and powdery adhesive agent 61 mixed uniformly mixtures 6, after heating, become and cohere the cladding 6 ' that coats annular core 51 '.
In sum; Combined type magnetic core of the present invention and preparation method thereof; The mixture that is mixed by powdered magnetic material and powdery adhesive agent coats core, is heated as cladding again, or adds hot mixt and process magnetic core to cohere with core; Thereby, can fusion cohere each other the powdery adhesive agent because meeting heat; Thereby need not can make powdered magnetic material cohere each other through the powdery adhesive agent through high pressure, can save required equipment of powder compaction process and cost like this and avoid damaging magnetic core, the bubble and the unequal problem of magnetic that also can make made cladding not utilize liquid adhesive agent to be produced because of high pressure.
Therefore, the equipment that combined type magnetic core of the present invention and preparation method thereof need not be expensive does not have the cracked problem of magnetic core, and made magnetic core magnetic is even.Therefore, when combined type magnetic core of the present invention is applied to electronic components such as inductor, transformer or filter, can have the good electron characteristic.
Should be understood that above-mentioned each embodiment only is used to principle of the present invention and effect are described, but not is used to limit the present invention.Concerning those of ordinary skills, can improve or conversion according to above-mentioned explanation, and these improvement and conversion all should belong to the protection range of accompanying claims of the present invention.
Claims (11)
1. a combined type magnetic core is characterized in that, comprises:
Columnar part;
Upper end and bottom are formed at the two ends of this columnar part respectively, and wherein, one of them is to be mixed with a preset ratio and the mixture made that forms forms by powdered magnetic material and powdery adhesive agent at least in said upper end and the said bottom.
2. combined type magnetic core according to claim 1 is characterized in that said mixture is mixed with powder insulation material.
3. combined type magnetic core according to claim 1 is characterized in that, said powdered magnetic material is the soft magnetism material.
4. combined type magnetic core according to claim 1 is characterized in that, said powdery adhesive agent is a solid resin.
5. combined type magnetic core according to claim 1 is characterized in that, the columnar part of said magnetic core is formed with the mixture made that another preset ratio mixes by another powdered magnetic material and another powdery adhesive agent.
6. combined type magnetic core according to claim 1; It is characterized in that; Said upper end is to be formed with the mixture made of first preset ratio mixing by first powdered magnetic material and the first powdery adhesive agent, and said bottom is formed with the mixture made of second preset ratio mixing by second powdered magnetic material and the second powdery adhesive agent.
7. the manufacture method of a combined type magnetic core is used to make the column core, it is characterized in that, may further comprise the steps:
A1, a mould is provided, and said mould has column and keeps mould and the upper and lower end formation mould that is connected these column maintenance mould two ends;
B1, mix powdered magnetic material and the powdery adhesive agent forms mixture, place the column of said mould to keep mould the column core, and the upper and lower end that said mixture is filled in said mould is respectively formed in the mould with a preset ratio;
C1, heating are filled in the mixture in the said mould, so that the two ends that this powdered magnetic material coheres and form in this column core each other through this powdery adhesive agent.
8. the manufacture method of combined type magnetic core according to claim 7 is characterized in that, the said mould of vibrations evenly mixed said mixture before step C1 also comprised heating.
9. the manufacture method of combined type magnetic core according to claim 7 is characterized in that, makes said mixture evenly be filled in said mould through normal pressure or low pressure when step C1 also comprises heating.
10. a combined type magnetic core is characterized in that, comprises:
Core, ringwise and have a breach;
Cladding, the said core of coaxial coating is whole, and is formed with the hole that runs through along the axle center of this core, and this cladding is formed by the mixture made that powdered magnetic material and powdery adhesive agent mix with a preset ratio.
11. a toroidal core method for making is used to make the annular core with breach, it is characterized in that may further comprise the steps:
A2, mix powdered magnetic material and powdery adhesive agent with a preset ratio, to form mixture;
B2, in mould, carry out to fill said mixture in regular turn, put into said annular core, fill the step of said mixture once more, so that said mixture coats said core is whole;
C2, heating are filled in the mixture in the said mould, are coated on this annular core integral body coaxially so that said powdered magnetic material coheres through this powdery adhesive agent each other, and are formed with the hole that runs through along the axle center of this annular core.
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| CN201110143721.4A CN102810386B (en) | 2011-05-31 | 2011-05-31 | Combined type magnetic core and method for making thereof |
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| CN201110143721.4A CN102810386B (en) | 2011-05-31 | 2011-05-31 | Combined type magnetic core and method for making thereof |
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| CN102810386B CN102810386B (en) | 2016-07-13 |
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Cited By (8)
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| CN106104718A (en) * | 2014-03-24 | 2016-11-09 | Ntn株式会社 | Magnetic element |
| CN106504846A (en) * | 2016-12-30 | 2017-03-15 | 江西艾特磁材有限公司 | A kind of ferrum ferrosilicon oxysome composite cores and preparation method thereof |
| CN106531389A (en) * | 2016-12-30 | 2017-03-22 | 江西艾特磁材有限公司 | Nanocrystalline composite magnetic core and preparation method thereof |
| CN106531393A (en) * | 2016-12-29 | 2017-03-22 | 江西艾特磁材有限公司 | High-conductive nanocrystalline magnetic core and preparation method thereof |
| CN106653302A (en) * | 2016-12-30 | 2017-05-10 | 江西艾特磁材有限公司 | Amorphous compound magnetic core and preparation method thereof |
| CN106653273A (en) * | 2016-12-30 | 2017-05-10 | 江西艾特磁材有限公司 | Iron-silicon-aluminum-ferrite composite magnetic core and preparation method therefor |
| CN107705954A (en) * | 2017-08-16 | 2018-02-16 | 无锡斯贝尔磁性材料有限公司 | A kind of compound magnet ring of soft magnetism and preparation method thereof |
| CN108399995A (en) * | 2018-02-09 | 2018-08-14 | 宁波耀峰液压电器有限公司 | A kind of magnetic guarantor type electromagnet |
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| CN106531393B (en) * | 2016-12-29 | 2018-03-27 | 江西艾特磁材有限公司 | Height leads nanocrystalline magnet core and preparation method thereof |
| CN106504846A (en) * | 2016-12-30 | 2017-03-15 | 江西艾特磁材有限公司 | A kind of ferrum ferrosilicon oxysome composite cores and preparation method thereof |
| CN106531389A (en) * | 2016-12-30 | 2017-03-22 | 江西艾特磁材有限公司 | Nanocrystalline composite magnetic core and preparation method thereof |
| CN106653302A (en) * | 2016-12-30 | 2017-05-10 | 江西艾特磁材有限公司 | Amorphous compound magnetic core and preparation method thereof |
| CN106653273A (en) * | 2016-12-30 | 2017-05-10 | 江西艾特磁材有限公司 | Iron-silicon-aluminum-ferrite composite magnetic core and preparation method therefor |
| CN107705954A (en) * | 2017-08-16 | 2018-02-16 | 无锡斯贝尔磁性材料有限公司 | A kind of compound magnet ring of soft magnetism and preparation method thereof |
| CN108399995A (en) * | 2018-02-09 | 2018-08-14 | 宁波耀峰液压电器有限公司 | A kind of magnetic guarantor type electromagnet |
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