JPH05287332A - Production of laminated drum core - Google Patents

Production of laminated drum core

Info

Publication number
JPH05287332A
JPH05287332A JP9455192A JP9455192A JPH05287332A JP H05287332 A JPH05287332 A JP H05287332A JP 9455192 A JP9455192 A JP 9455192A JP 9455192 A JP9455192 A JP 9455192A JP H05287332 A JPH05287332 A JP H05287332A
Authority
JP
Japan
Prior art keywords
core
value
drum core
drum
powder
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
Application number
JP9455192A
Other languages
Japanese (ja)
Inventor
Hideki Matsui
秀樹 松井
Takeshi Mochizuki
武史 望月
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FDK Corp
Original Assignee
FDK Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FDK Corp filed Critical FDK Corp
Priority to JP9455192A priority Critical patent/JPH05287332A/en
Publication of JPH05287332A publication Critical patent/JPH05287332A/en
Pending legal-status Critical Current

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  • Powder Metallurgy (AREA)

Abstract

PURPOSE:To produce a laminated drum core consisting of a central core to be wound with a coil and flanges on both ends without any conventional variance in the L value and C value as the characteristics of the product due to the error in the diameter of the core. CONSTITUTION:In the production of a drum core, a three-layered compact obtained by interposing a high-permeability powder between low-permeability powders is formed to keep the permeability of the central powder high when the powder is compacted to obtain the columnar compact. The center of the compact is then cut to size the core, and the compact is sintered to produce the drum core.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、主に電子部品であるイ
ンダクタ等に用いられるドラムコアの製造方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a drum core mainly used for inductors which are electronic parts.

【0002】[0002]

【従来の技術】従来、ドラムコアに捲線を施した電子部
品は、例えばVTRのIFT用インダクタ、あるいはC
RT補助偏向ヨークなどに使用される。このドラムコア
は、捲線を実際に施す中央の芯部と、この芯部の両端の
フランジ部とから成る。
2. Description of the Related Art Conventionally, an electronic component in which a drum core is wound is, for example, an IFT inductor for a VTR or a C
It is used for RT auxiliary deflection yoke. This drum core is composed of a central core portion on which winding is actually applied and flange portions at both ends of the core portion.

【0003】このようなドラムコアの製造は、通常、円
柱状の空間をもつ押型の内部に、均質な組成を有する粉
体材料を充填し、圧縮成形して、図5に示すような円柱
状の成形体1を作る。そして、この成形体1の中央部分
3を切削して、図6に示す上記ドラムコア5の形状にす
る。その後、900〜1200℃の温度で焼成し製品と
する。
In the manufacture of such a drum core, a powder material having a uniform composition is usually filled in the inside of a die having a cylindrical space, and compression molding is performed to form a cylindrical shape as shown in FIG. The molded body 1 is made. Then, the central portion 3 of the molded body 1 is cut into the shape of the drum core 5 shown in FIG. Then, the product is baked at a temperature of 900 to 1200 ° C.

【0004】このようにして製造されるドラムコアに要
求される特性項目としては、L値(インダクタンス:磁
力を誘導する能力を示す)、Q値(選択度:希望の周波
数の電気信号を選択する選択の良さを示す)、さらには
これらL値やQ値などの温度特性及び周波数特性などが
ある。これらの特性項目は、前記粉体材料の組成などに
よって決まるが、2つ以上の特性は互いに相反する場合
がある。そのような場合には各特性に優先順位を定めて
おき、上位の優先順位を有する特性を優先して前記組成
などを決定していく。
Characteristic items required for the drum core manufactured as described above include L value (inductance: showing ability to induce magnetic force), Q value (selectivity: selection for selecting an electric signal of a desired frequency). Of the L value, Q value, and other temperature characteristics and frequency characteristics. Although these characteristic items are determined by the composition of the powder material, two or more characteristics may conflict with each other. In such a case, a priority order is set for each characteristic, and the composition or the like is determined by giving priority to a characteristic having a higher priority order.

【0005】したがって、これら複数の特性のバランス
がうまくとれた製品を製造することは、新しい粉体材料
を一から開発する必要を伴う場合が多く、非常に困難な
ことが多かった。
Therefore, producing a product in which these plural characteristics are well balanced often involves the need to develop a new powder material from scratch, and is often very difficult.

【0006】[0006]

【発明が解決しようとする課題】すなわち、特に特性項
目の一部である前記L値とC値(静電容量)とは、ドラ
ムコアの芯の寸法、例えば芯径の影響を受け易いもので
あった。したがって、L値,C値を要求される規格内に
納めるためには、芯部の寸法公差を厳しく規定する必要
があった。しかし、ドラムコアを用いた電気製品の寸法
も年々小型化され、小型化に伴って芯部の寸法を厳密に
出すのにはおのずと限界があり、前記L値やC値にバラ
つきが生じ易いものであった。
That is, the L value and C value (capacitance), which are part of the characteristic items, are particularly susceptible to the size of the core of the drum core, for example, the core diameter. It was Therefore, in order to keep the L value and the C value within the required standard, it was necessary to strictly define the dimensional tolerance of the core. However, the size of electrical products using drum cores is also becoming smaller year by year, and there is a natural limit to the exact size of the core portion as the size becomes smaller, and the L and C values tend to vary. there were.

【0007】本発明は以上の問題点を解決するために成
されたもので、芯部の寸法公差をそれほど厳しく規定し
なくても、L値やC値にバラつきを生じることが少ない
積層タイプドラムコアの製造方法を提供することを目的
とする。
The present invention has been made in order to solve the above problems, and is a laminated type drum core in which variations in L value and C value are less likely to occur even if the dimensional tolerance of the core is not so strict. It aims at providing the manufacturing method of.

【0008】[0008]

【課題を解決するための手段】以上の目的を達成するた
めに本発明は、捲線を施す中央の芯部と、その両端に設
けられたフランジ部とを有する積層タイプドラムコアの
製造方法において、円柱状の空間をもつ押型内部に、高
透磁率の粉体材料層を中央にして低透磁率の粉体材料層
で挟んだサンドイッチ状の積層状態とする粉体材料の充
填をおこない、これを圧縮成形する成形工程と、成形さ
れた円柱状の材料の中央を切削して芯部の寸法を出す切
削工程と、切削後に焼成をおこなう焼成工程とからなる
ものである。
In order to achieve the above object, the present invention provides a method for producing a laminated type drum core having a central core portion to be wound and flange portions provided at both ends of the core portion. Inside a die with a columnar space, a powder material with a high magnetic permeability is placed in the center of a powder material layer with a low magnetic permeability to form a sandwich-like powder material, which is then compressed. It comprises a forming step of forming, a cutting step of cutting the center of the formed cylindrical material to obtain the dimension of the core portion, and a firing step of firing after cutting.

【0009】[0009]

【作用】芯部とフランジ部の粉体材料を別々にするこ
と、そして芯部の透磁率を高くすることで、芯部の寸法
公差がL値やC値に与える影響を小さくできる。
By using different powder materials for the core and the flange and increasing the magnetic permeability of the core, it is possible to reduce the influence of the dimensional tolerance of the core on the L value and the C value.

【0010】[0010]

【実施例】以下本考案の一実施例を図1〜図4を用いて
説明する。本実施例のドラムコアは、電子製品のIFT
用インダクタとして使用されるものである。このインダ
クタに用いられるドラムコアの製造工程を、図1のフロ
ーチャートにしたがって説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The drum core of this embodiment is an IFT for electronic products.
It is used as an inductor. The manufacturing process of the drum core used for this inductor will be described with reference to the flowchart of FIG.

【0011】まず、粉体材料を圧縮成形して、図3に示
す円柱状の成形体1を成形する。このとき、図2に示す
ように、円柱状の空間をもつ押型7を用いる。この押型
7は上下立押タイプであり、円柱状の空間を有する臼型
9、この臼型9の下に嵌合される下杵型11、及び充填
された粉体材料13を上方から押圧する上杵型15とか
らなる。粉体材料13としては、透磁率、正確には交流
初透磁率μの異なる2種類のものが用意される。そし
て、まず低透磁率の粉体材料13Aが充填され、次に高
透磁率の粉体材料13Bが充填され、最後に再び低透磁
率の粉体材料13Aが充填され、3層の積層状態とな
る。
First, a powder material is compression-molded to form a cylindrical molded body 1 shown in FIG. At this time, as shown in FIG. 2, a pressing die 7 having a cylindrical space is used. This pressing die 7 is a vertical pressing type and presses the die 9 having a cylindrical space, the lower punch die 11 fitted under the die 9, and the filled powder material 13 from above. It consists of the upper punch type 15. As the powder material 13, two types of materials having different magnetic permeability, more accurately, AC initial magnetic permeability μ are prepared. Then, first, the powder material 13A having a low magnetic permeability is filled, then the powder material 13B having a high magnetic permeability is filled, and finally, the powder material 13A having a low magnetic permeability is filled again. Become.

【0012】このような2種類の粉体材料13A,13
Bの組み合わせには種々のものが考えられる。すなわ
ち、L値,C値,Q値、あるいはこれらの温度特性、周
波数特性などの特性項目のバランスがとれる材質を選択
する。そして、後工程である焼成工程における熱膨張率
の関係からは、全く異なる組成材質のものよりも、例え
ばNi−Zn−Cu系同士の材料の組み合わせとするこ
とが望ましい。そして、製造されたドラムコア5がトー
タルとして前記特性を、あるいは特性のバランスを達成
できるような組み合わせとする。例えば一例として、下
記に示す材料 (1)芯部にあたる高透磁率材(μiac =約1000) Fe2 3 49.0mol% NiO 13.0mol% ZnO 33.0mol% CuO 5.0mol% (2)フランジ部にあたる低透磁率材(μiac =約5
0) Fe2 3 46.0mol% NiO 35.0mol% ZnO 13.0mol% MnO 4.0mol% CoO 0.5mol% SiO2 1.5mol% を組み合わせて使用する。
Two kinds of such powder materials 13A, 13
Various combinations of B are possible. That is, a material that balances the L value, C value, Q value, or characteristic items such as temperature characteristic and frequency characteristic thereof is selected. From the relationship of the coefficient of thermal expansion in the firing step which is a post-step, it is preferable to use a combination of Ni—Zn—Cu-based materials rather than materials having completely different compositions. The manufactured drum cores 5 are combined so as to achieve the above-mentioned characteristics as a whole or a balance of the characteristics. For example, the following materials (1) high-permeability material (μ iac = about 1000) corresponding to the core Fe 2 O 3 49.0 mol% NiO 13.0 mol% ZnO 33.0 mol% CuO 5.0 mol% (2 ) Low magnetic permeability material (μ iac = approx. 5)
0) Fe 2 O 3 46.0 mol% NiO 35.0 mol% ZnO 13.0 mol% MnO 4.0 mol% CoO 0.5 mol% SiO 2 1.5 mol% are used in combination.

【0013】このようにして充填がおこなわれた後に、
図2に示すように、上杵型15により圧縮成形がおこな
われ、図3に示す円筒状の成形体1が形成される。この
成形体1の中央部分3、すなわち芯部となる部分を切削
する。その切削は、ダイヤモンドホイル砥石を備えた小
型ドラム切削機などによっておこなう。そして、芯部1
7の芯径などの寸法を所定の値にする。このとき従来に
比べてそれほど寸法公差を厳しく管理する必要はない。
すなわち、この芯部17の透磁率は高くなっており、ト
ータルとしてのドラムコア5のL値やC値に対し、芯部
17の寸法の誤差が従来ほどには大きな影響を与えない
からである。言い換えれば、芯部17の材質には寸法の
変化に対して鈍感な性質を有する組成の材質が用いられ
たことになる。したがって、芯部17の寸法公差を緩く
設定することが可能となる。
After filling in this way,
As shown in FIG. 2, compression molding is performed by the upper punch die 15 to form the cylindrical molded body 1 shown in FIG. The central portion 3 of the molded body 1, that is, the portion that becomes the core portion is cut. The cutting is performed by a small drum cutting machine equipped with a diamond wheel grindstone. And the core 1
The core diameter of 7 is set to a predetermined value. At this time, it is not necessary to strictly control the dimensional tolerance as compared with the conventional case.
That is, the magnetic permeability of the core portion 17 is high, and the dimensional error of the core portion 17 does not have a great influence on the L value and the C value of the drum core 5 as a whole. In other words, the material of the core portion 17 is a material having a composition that is insensitive to changes in dimensions. Therefore, the dimensional tolerance of the core portion 17 can be set loosely.

【0014】このようにして切削が終った後、上記2種
類の粉体材料13A,13Bに応じた温度(一般には9
00〜1200℃程度)での焼成をおこなう。これによ
りドラムコアの最終製品が完成する。
After the cutting is thus completed, the temperature (generally 9
Baking is performed at about 00 to 1200 ° C. This completes the final product of the drum core.

【0015】以上のように、本実施例の製造方法によれ
ば、IFT用インダクタのようにドラムコアの全体の寸
法が小さく、例えば従来フランジ部の直径が5〜8mm程
度であり、芯部の直径の寸法公差が、前記フランジ部の
直径に対して1.5〜2%程度要求されていたものであ
っても、芯部の寸法公差をそれほど厳しく規定せずに、
L値やC値を十分な規格内の値に納めることが可能とな
る。
As described above, according to the manufacturing method of this embodiment, the overall size of the drum core is small like the inductor for IFT, and the diameter of the conventional flange portion is about 5 to 8 mm, and the diameter of the core portion is small. Even if the dimensional tolerance of is required to be about 1.5 to 2% with respect to the diameter of the flange portion, the dimensional tolerance of the core portion is not so strictly defined,
It is possible to set the L value and the C value within a value within a sufficient standard.

【0016】[0016]

【発明の効果】以上説明したように、本発明の積層タイ
プドラムコアの製造方法によれば、成形工程で芯部とフ
ランジ部との透磁率を別なものとし、芯部の透磁率を高
いものとすることで、芯部の寸法公差がL値やC値に与
える影響を小さくすることができる。したがって、芯部
の寸法公差をそれほど厳しく管理しなくても、L値やC
値のバラつきを小さくすることができる。
As described above, according to the method for manufacturing a laminated type drum core of the present invention, the magnetic permeability of the core portion and the flange portion are different in the molding step, and the magnetic permeability of the core portion is high. By so doing, it is possible to reduce the influence of the dimensional tolerance of the core on the L value and the C value. Therefore, even if the dimensional tolerance of the core is not so tightly controlled, L value and C
It is possible to reduce variation in the value.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示すフロー図である。FIG. 1 is a flow chart showing an embodiment of the present invention.

【図2】図1の圧縮成形に使用される押型の縦断面図で
ある。
FIG. 2 is a vertical sectional view of a die used for compression molding in FIG.

【図3】図2の押型で成形された成形体の縦断面図であ
る。
FIG. 3 is a vertical cross-sectional view of a molded body molded by the die of FIG.

【図4】図3の成形体を切削して形成されるドラムコア
の斜視図である。
FIG. 4 is a perspective view of a drum core formed by cutting the molded body of FIG.

【図5】従来のドラムコアに用いられる成形体の縦断面
図である。
FIG. 5 is a vertical cross-sectional view of a molded body used for a conventional drum core.

【図6】図5の成形体から切削,形成されるドラムコア
の斜視図である。
6 is a perspective view of a drum core cut and formed from the molded body of FIG.

【符号の説明】[Explanation of symbols]

5 ドラムコア 17 芯部(ドラムコア5の) 5 Drum core 17 Core part (of drum core 5)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 捲線を施す中央の芯部と、その両端に設
けられたフランジ部とを有する積層タイプドラムコアの
製造方法において、 円柱状の空間をもつ押型内部に、高透磁率の粉体材料層
を中央にして低透磁率の粉体材料層で挟んだサンドイッ
チ状の積層状態とする粉体材料の充填をおこない、これ
を圧縮成形する成形工程と、 成形された円柱状の材料の中央を切削して芯部の寸法を
出す切削工程と、 切削後に焼成をおこなう焼成工程と、 からなることを特徴とする積層タイプドラムコアの製造
方法。
1. A method of manufacturing a laminated type drum core having a central core portion to be wound and flange portions provided at both ends thereof, wherein a powder material having a high magnetic permeability is provided inside a pressing die having a cylindrical space. The layer is placed in the center of the layer, and the powder material is sandwiched between layers of low-permeability powder. A method for producing a laminated type drum core, comprising: a cutting step of cutting to obtain a core portion dimension; and a firing step of firing after cutting.
JP9455192A 1992-04-14 1992-04-14 Production of laminated drum core Pending JPH05287332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9455192A JPH05287332A (en) 1992-04-14 1992-04-14 Production of laminated drum core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9455192A JPH05287332A (en) 1992-04-14 1992-04-14 Production of laminated drum core

Publications (1)

Publication Number Publication Date
JPH05287332A true JPH05287332A (en) 1993-11-02

Family

ID=14113457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9455192A Pending JPH05287332A (en) 1992-04-14 1992-04-14 Production of laminated drum core

Country Status (1)

Country Link
JP (1) JPH05287332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012230965A (en) * 2011-04-25 2012-11-22 Hitachi Powdered Metals Co Ltd Powder magnetic core, and manufacturing method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61250133A (en) * 1985-04-26 1986-11-07 Mazda Motor Corp Manufacture of composite member
JPS6487705A (en) * 1987-09-29 1989-03-31 Mazda Motor Method of compacting powder multi-layers
JPH02125404A (en) * 1988-11-04 1990-05-14 Taiyo Yuden Co Ltd Magnetic core and manufacture thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61250133A (en) * 1985-04-26 1986-11-07 Mazda Motor Corp Manufacture of composite member
JPS6487705A (en) * 1987-09-29 1989-03-31 Mazda Motor Method of compacting powder multi-layers
JPH02125404A (en) * 1988-11-04 1990-05-14 Taiyo Yuden Co Ltd Magnetic core and manufacture thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012230965A (en) * 2011-04-25 2012-11-22 Hitachi Powdered Metals Co Ltd Powder magnetic core, and manufacturing method therefor

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