JPH11273926A - Manufacture of dust core and pot-like dust core - Google Patents
Manufacture of dust core and pot-like dust coreInfo
- Publication number
- JPH11273926A JPH11273926A JP10092585A JP9258598A JPH11273926A JP H11273926 A JPH11273926 A JP H11273926A JP 10092585 A JP10092585 A JP 10092585A JP 9258598 A JP9258598 A JP 9258598A JP H11273926 A JPH11273926 A JP H11273926A
- Authority
- JP
- Japan
- Prior art keywords
- alloy powder
- binder
- magnetic
- dust core
- molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電子機器の電源等
の巻線部品に用いて好適な圧粉磁芯の製造方法と、それ
を用いてなる壷型圧粉磁芯に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dust core suitable for use as a winding component such as a power supply of an electronic device, and a pot-shaped dust core using the same.
【０００２】[0002]
【従来の技術】電子機器の電源等の、高周波で用いられ
る巻線部品であるチョークコイル等には、フェライト磁
芯や圧粉磁芯が使用されている。2. Description of the Related Art Ferrite cores and dust cores are used for choke coils and the like, which are winding components used at high frequencies, such as power supplies for electronic equipment.
【０００３】このうち、フェライト磁芯は、飽和磁束密
度が小さいという欠点を有している。これに対して、軟
磁性合金粉末を成形して得られる圧粉磁芯は、軟磁性フ
ェライトに比べて高い飽和磁束密度（磁気特性）を持
つ。そのため、圧粉磁芯を用いた巻線部品は、直流重畳
性に優れているという長所を有している。[0003] Among them, the ferrite magnetic core has a disadvantage that the saturation magnetic flux density is small. On the other hand, a dust core obtained by molding a soft magnetic alloy powder has a higher saturation magnetic flux density (magnetic property) than soft magnetic ferrite. Therefore, a winding component using a dust core has an advantage of being excellent in direct current superposition.
【０００４】[0004]
【発明が解決しようとする課題】一方、圧粉磁芯の高い
磁気特性は、図４に示すように、扁平な形状の合金粉末
２１を、粉末の長軸が一定方向に揃う、いわゆる“落葉
の堆積効果”によって、配向させて得られるため、主に
トロイダル形状の磁芯２０にして用いられていた（図
５）。On the other hand, as shown in FIG. 4, the high magnetic property of the dust core is such that a flat alloy powder 21 is formed by so-called "fallen leaves" in which the major axes of the powder are aligned in a certain direction. It is mainly used as a toroidal-shaped magnetic core 20 because it is obtained by orienting by the "deposition effect of the magnetic field" (FIG. 5).
【０００５】しかしながら、トロイダル形状の磁芯に、
効率よく巻線を施すのは難しい。一方、ボビン等を用い
て、巻線を効率よく施し得る壷型磁芯１０（図２、図
３）の場合には、主磁路の方向と圧縮成形の方向（図
２、図３中の矢印３０）が一致するため、“落葉の堆積
効果”による合金粉末２１の配向の効果は得られず、高
い磁気特性は得られない。また、壷型磁芯のリターンパ
ス部１１は、肉厚が薄いため、壷型磁芯の圧縮成形時の
生産性が高くはなかった。However, toroidal magnetic cores
It is difficult to apply windings efficiently. On the other hand, in the case of a pot-shaped magnetic core 10 (FIGS. 2 and 3) that can efficiently perform winding by using a bobbin or the like, the direction of the main magnetic path and the direction of compression molding (FIG. 2 and FIG. 3). Since the arrows 30) coincide with each other, the effect of the orientation of the alloy powder 21 due to the "deposition effect of falling leaves" cannot be obtained, and high magnetic properties cannot be obtained. Further, since the thickness of the return path portion 11 of the pot-shaped magnetic core is thin, the productivity at the time of compression molding of the pot-shaped magnetic core was not high.
【０００６】そこで、本発明の課題は、高い磁気特性が
得られ、生産性が高く、巻線を効率よく施し得る圧粉磁
芯の製造方法と、その製造方法を用いてなる壷型圧粉磁
芯を提供することである。Accordingly, an object of the present invention is to provide a method of manufacturing a dust core capable of obtaining high magnetic properties, high productivity, and efficient winding, and a pot-shaped dust core using the manufacturing method. It is to provide a magnetic core.
【０００７】[0007]
【課題を解決するための手段】本発明は、軟磁性合金粉
末とバインダを混合した後に、圧縮成形し、バインダを
硬化処理し、得られた圧粉体を解砕し、得られたバイン
ダ被覆された合金粉末を再成形することを特徴とする圧
粉磁芯の製造方法である。SUMMARY OF THE INVENTION According to the present invention, a soft magnetic alloy powder and a binder are mixed, then compression-molded, the binder is hardened, the obtained green compact is crushed, and the obtained binder coating is obtained. A method for producing a dust core, comprising reshaping the obtained alloy powder.
【０００８】また、本発明は、前記バインダ被覆された
合金粉末を、磁場中で配向させて、再成形することを特
徴とする上記の圧粉磁芯の製造方法である。[0008] The present invention is the above-mentioned method for producing a dust core, wherein the binder-coated alloy powder is oriented in a magnetic field and then remolded.
【０００９】また、本発明は、前記軟磁性合金粉末とし
て、アスペクト比が５以上で、短軸長が５０μｍ以下の
Ｆｅ−Ｓｉ−Ａｌを主成分とする合金粉末を用いること
を特徴とする上記の圧粉磁芯の製造方法である。In the present invention, the soft magnetic alloy powder is preferably an alloy powder having an aspect ratio of 5 or more and a short axis length of 50 μm or less and containing Fe—Si—Al as a main component. This is a method for producing a dust core.
【００１０】また、本発明は、上記の圧粉磁芯の製造方
法を用いてなることを特徴とする壷型圧粉磁芯である。[0010] The present invention also provides a pot-shaped dust core obtained by using the above-described method for manufacturing a dust core.
【００１１】[0011]
【発明の実施の形態】本発明では、成形時に合金粉末が
最も安定する状態の、いわゆる“落葉の堆積効果”によ
り、粉末の長軸を一定方向に揃えて成形し、バインダを
硬化させて成形体を得る。次に、得られた成形体を所定
の粒径になるように解砕し、バインダ被覆された合金粉
末を得る。次に、得られた合金粉末を所望の形状の圧粉
磁芯を得るための金型に充填し、再成形を行う。その
際、磁芯の透磁率を高めるために、磁場中で成形を行
い、主磁路方向に前記合金粉末を配向させる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the powder is formed by aligning the major axis of the powder in a certain direction and hardening the binder by the so-called "leaf depositing effect" in which the alloy powder is most stable at the time of molding. Get the body. Next, the obtained compact is crushed so as to have a predetermined particle size to obtain a binder-coated alloy powder. Next, the obtained alloy powder is filled in a mold for obtaining a dust core having a desired shape, and remolding is performed. At that time, in order to increase the magnetic permeability of the magnetic core, molding is performed in a magnetic field, and the alloy powder is oriented in the direction of the main magnetic path.
【００１２】なお、本発明において、軟磁性合金粉末の
アスペクト比を５以上、短軸長を５０μｍ以下としたの
は、アスペクト比が５未満だと高い磁気特性（透磁率、
飽和磁束密度）が得られず、また、短軸長が５０μｍを
越えると、アスペクト比が確保できないからである。In the present invention, the aspect ratio of the soft magnetic alloy powder is set to 5 or more and the minor axis length is set to 50 μm or less because high magnetic properties (magnetic permeability,
This is because if the saturation magnetic flux density cannot be obtained and the short axis length exceeds 50 μm, the aspect ratio cannot be secured.
【００１３】[0013]
【実施例】以下に、本発明を実施例を用いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.
【００１４】（実施例１）アスペクト比が７で、短軸長
が７μｍの形状に調整されたＢａｌＦｅ−３.５ｗｔ％
Ｓｉ合金粉末にシリコーン樹脂を３ｗｔ％添加して混合
し、成形圧力５ｔｏｎｆ／ｃｍ2で成形し、５０ｍｍ×
５０ｍｍ×４０ｍｍの直方体形状の成形体を得た。(Example 1) BalFe-3.5wt% adjusted to a shape having an aspect ratio of 7 and a minor axis length of 7µm
3 wt% of a silicone resin is added to and mixed with the Si alloy powder, and the mixture is molded at a molding pressure of 5 tonf / cm 2 , and 50 mm ×
A rectangular parallelepiped molded product of 50 mm × 40 mm was obtained.
【００１５】得られた成形体を、一旦、バインダ硬化さ
せてからディスクミルで解砕し、目開きが１００μｍの
ふるいを通し、バインダ被覆された合金粉末を得た。The obtained molded body was once hardened with a binder and then crushed with a disk mill, and passed through a sieve having openings of 100 μm to obtain a binder-coated alloy powder.
【００１６】得られたバインダ被覆された合金粉末の内
部の状態を２００倍の拡大鏡で観察したところ、個々の
合金粉末は、数十個程度の偏平状粉末で構成されてお
り、その偏平状粉末の全ての長軸が、同一方向に揃い、
配向されていた。When the internal state of the obtained binder-coated alloy powder was observed with a magnifying glass of 200 times, each of the alloy powders was composed of about several tens of flat powders. All major axes of the powder are aligned in the same direction,
Had been oriented.
【００１７】次に、得られたバインダ被覆された合金粉
末に、さらにシリコーン樹脂を２ｗｔ％添加して混合し
た。Next, 2 wt% of a silicone resin was further added to and mixed with the obtained binder-coated alloy powder.
【００１８】図１に、本発明の磁場中成形を模式的に説
明する図を示す。１は壷型磁芯の金型の空洞部を示し、
２は磁場発生器の磁極を示す。FIG. 1 is a diagram schematically illustrating molding in a magnetic field according to the present invention. Reference numeral 1 denotes a mold cavity of a pot-shaped magnetic core,
Reference numeral 2 denotes a magnetic pole of the magnetic field generator.
【００１９】そして、図１に示すように、対向する磁極
２の間に設けた壷型磁芯の金型の空洞部１に合金粉末２
１を充填し、磁極２の間に約４００ｋＡ／ｍの磁場（磁
場方向を矢印Ｈで示す）を発生させてから、合金粉末２
１を圧縮再成形（成形圧力１５ｔｏｎｆ／ｃｍ2）し、
得られた成形体に１８０℃×２Ｈｒのバインダ硬化処理
を施し、さらに、７００℃×２Ｈｒの熱処理を施して、
本発明の壷型圧粉磁芯を得た。As shown in FIG. 1, an alloy powder 2 is placed in a cavity 1 of a mold of a pot-shaped magnetic core provided between opposed magnetic poles 2.
1 and a magnetic field of about 400 kA / m is generated between the magnetic poles 2 (the direction of the magnetic field is indicated by an arrow H).
1 was compression-reformed (forming pressure 15 tonf / cm 2 )
The obtained molded body is subjected to a binder curing treatment at 180 ° C. × 2 hours, and further subjected to a heat treatment at 700 ° C. × 2 hours.
A pot-shaped dust core of the present invention was obtained.
【００２０】バインダ被覆された合金粉末は、あたかも
造粒したように、扁平状粉末の集合体となっていて、い
わゆる粉流れがよく、再成形時の圧縮成形の生産性は向
上した。The binder-coated alloy powder is an aggregate of flat powders as if granulated, so that the so-called powder flow was good, and the productivity of compression molding at the time of remolding was improved.
【００２１】得られた壷型圧粉磁芯は、外径φ２０ｍ
ｍ、内径φ１５ｍｍ、中心磁極直径φ１０ｍｍ、高さ７
ｍｍである。The obtained pot-shaped dust core has an outer diameter of 20 m.
m, inner diameter φ15mm, center pole diameter φ10mm, height 7
mm.
【００２２】一方、比較例として、アスペクト比が７
で、短軸長が７μｍの形状に調整されたＢａｌＦｅ−
３.５ｗｔ％Ｓｉ合金粉末にシリコーン樹脂を５ｗｔ％
添加してから混合した合金粉末を使用して、成形条件を
実施例１と同じくして、ただし磁場は印加せずに、壷型
圧粉磁芯を得た。On the other hand, as a comparative example, the aspect ratio was 7
The BalFe- is adjusted to have a short axis length of 7 μm.
3.5 wt% Si alloy powder with 5 wt% silicone resin
Using the alloy powder mixed after addition, the molding conditions were the same as in Example 1, except that no magnetic field was applied, and a pot-shaped dust core was obtained.
【００２３】得られた実施例と比較例の壷型圧粉磁芯の
飽和磁束密度（外部磁場２０ＫＡ／ｍの磁束密度）を、
１ｋＨｚ〜１５ｋＨｚの周波数範囲で、測定して、表１
に示す結果を得た。The saturation magnetic flux densities (magnetic flux densities of an external magnetic field of 20 KA / m) of the obtained pot-shaped dust cores of the example and the comparative example are as follows:
Measured in the frequency range of 1 kHz to 15 kHz, Table 1
Were obtained.
【００２４】（表１） (Table 1)
【００２５】表１に示すように、本発明によって得られ
た圧粉磁芯は、高い透磁率、すなわち高い磁気特性を有
していた。As shown in Table 1, the dust core obtained by the present invention had high magnetic permeability, that is, high magnetic properties.
【００２６】[0026]
【発明の効果】本発明によれば、高い磁気特性が得ら
れ、生産性が高く、巻線を効率よく施し得る圧粉磁芯の
製造方法と、その製造方法を用いてなる壷型圧粉磁芯が
得られる。According to the present invention, a method of manufacturing a dust core capable of obtaining high magnetic properties, high productivity, and efficiently applying windings, and a pot-shaped dust core using the manufacturing method A magnetic core is obtained.
【図１】本発明の磁場中成形を模式的に示す説明図。FIG. 1 is an explanatory view schematically showing molding in a magnetic field of the present invention.
【図２】壷型磁芯の外観斜視図。FIG. 2 is an external perspective view of a pot-shaped magnetic core.
【図３】壷型磁芯の断面での合金粉末の状態を模式的に
示す説明図。FIG. 3 is an explanatory view schematically showing a state of an alloy powder in a cross section of a pot-shaped magnetic core.
【図４】“落葉の堆積効果”を模式的に示す説明図。FIG. 4 is an explanatory view schematically showing the “leaf deposit effect”.
【図５】トロイダル形状の磁芯の外観斜視図。FIG. 5 is an external perspective view of a toroidal magnetic core.
１ （壷型磁芯の）金型の空洞部 ２ （磁場発生器の）磁極 １０ 壷型磁芯 １１ （壷型磁芯の）リターンパス部 ２０ （トロイダル形状の）磁芯 ２１ （扁平な形状の）合金粉末 ３０ （主磁路の方向と圧縮成形の方向を示す）矢印 Ｈ （磁場方向を示す）矢印 DESCRIPTION OF SYMBOLS 1 Cavity part (of a pot type magnetic core) 2 Magnetic pole (of a magnetic field generator) 10 Pot type magnetic core 11 Return path part (of a pot type magnetic core) 20 Magnetic core (of a toroidal shape) 21 (flat shape) Alloy powder 30) arrow (indicating the direction of the main magnetic path and compression molding) arrow H (indicating the direction of the magnetic field)
Claims (4)
に、圧縮成形し、バインダを硬化処理し、得られた圧粉
体を解砕し、得られたバインダ被覆された合金粉末を再
成形することを特徴とする圧粉磁芯の製造方法。1. After mixing a soft magnetic alloy powder and a binder, compression molding is performed, the binder is hardened, the obtained green compact is crushed, and the obtained binder-coated alloy powder is reformed. A method for producing a dust core.
場中で配向させて、再成形することを特徴とする請求項
１記載の圧粉磁芯の製造方法。2. The method according to claim 1, wherein the binder-coated alloy powder is oriented in a magnetic field and then re-formed.
比が５以上で、短軸長が５０μｍ以下のＦｅ−Ｓｉ−Ａ
ｌを主成分とする合金粉末を用いることを特徴とする請
求項１または２記載の圧粉磁芯の製造方法。3. An Fe—Si—A alloy having an aspect ratio of 5 or more and a minor axis length of 50 μm or less as the soft magnetic alloy powder.
3. The method for producing a dust core according to claim 1, wherein an alloy powder containing l as a main component is used.
粉磁芯の製造方法を用いてなることを特徴とする壷型圧
粉磁芯。4. A pot-shaped dust core obtained by using the method for producing a dust core according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10092585A JPH11273926A (en) | 1998-03-19 | 1998-03-19 | Manufacture of dust core and pot-like dust core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10092585A JPH11273926A (en) | 1998-03-19 | 1998-03-19 | Manufacture of dust core and pot-like dust core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11273926A true JPH11273926A (en) | 1999-10-08 |
Family
ID=14058527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10092585A Pending JPH11273926A (en) | 1998-03-19 | 1998-03-19 | Manufacture of dust core and pot-like dust core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11273926A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441062B1 (en) * | 2001-08-07 | 2004-07-19 | 주식회사 디씨엔 | Pot core made from Fe-Si soft magnetic powder, method of producing thereof and reactor comprising the same |
| KR100499014B1 (en) * | 2002-01-17 | 2005-07-01 | 휴먼일렉스(주) | The amorphous metal alloy powder core and nano-crystal alloy powder core having superior plasticity and methods of manufacturing the same |
| JP2011504662A (en) * | 2008-03-11 | 2011-02-10 | チャン ソン コーポレイション | Multilayer power inductor using a sheet filled with soft magnetic metal powder |
-
1998
- 1998-03-19 JP JP10092585A patent/JPH11273926A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441062B1 (en) * | 2001-08-07 | 2004-07-19 | 주식회사 디씨엔 | Pot core made from Fe-Si soft magnetic powder, method of producing thereof and reactor comprising the same |
| KR100499014B1 (en) * | 2002-01-17 | 2005-07-01 | 휴먼일렉스(주) | The amorphous metal alloy powder core and nano-crystal alloy powder core having superior plasticity and methods of manufacturing the same |
| JP2011504662A (en) * | 2008-03-11 | 2011-02-10 | チャン ソン コーポレイション | Multilayer power inductor using a sheet filled with soft magnetic metal powder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |