JPH06275452A - Manufacture of dust core - Google Patents
Manufacture of dust coreInfo
- Publication number
- JPH06275452A JPH06275452A JP5085706A JP8570693A JPH06275452A JP H06275452 A JPH06275452 A JP H06275452A JP 5085706 A JP5085706 A JP 5085706A JP 8570693 A JP8570693 A JP 8570693A JP H06275452 A JPH06275452 A JP H06275452A
- Authority
- JP
- Japan
- Prior art keywords
- flattening
- dust core
- ferromagnetic metal
- organic lubricant
- metal particles
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000011162 core material Substances 0.000 claims abstract description 50
- 239000000314 lubricant Substances 0.000 claims abstract description 36
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 29
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims abstract description 20
- 241000723346 Cinnamomum camphora Species 0.000 claims abstract description 20
- 229960000846 camphor Drugs 0.000 claims abstract description 20
- 229930008380 camphor Natural products 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 17
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000002923 metal particle Substances 0.000 claims description 26
- 239000011230 binding agent Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- -1 fatty acid salt Chemical class 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 abstract description 12
- 230000035699 permeability Effects 0.000 abstract description 12
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 3
- 238000009692 water atomization Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000000137 annealing Methods 0.000 description 6
- 238000000748 compression moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910017318 Mo—Ni Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 229910000815 supermalloy Inorganic materials 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種電気・電子機器に
用いられる圧粉コアを製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dust core used in various electric and electronic devices.
【０００２】[0002]
【従来の技術】近年、電気・電子機器の小型化がすす
み、小型で高効率の圧粉コアが要求されている。圧粉コ
アに偏平状強磁性金属粒子からなる粉末を用いると高透
磁率で渦電流損が小さくなることから、コアを小型化す
ることができる。圧粉コアでは、鉄粒子に水ガラスの被
覆を形成して絶縁層およびバインダとすることが一般的
に行なわれている。2. Description of the Related Art In recent years, miniaturization of electric and electronic devices has been progressing, and a compact and highly efficient dust core has been demanded. When powder composed of flat ferromagnetic metal particles is used for the dust core, eddy current loss is reduced with high magnetic permeability, so that the core can be downsized. In the dust core, it is general practice to form a coating of water glass on iron particles to form an insulating layer and a binder.
【０００３】展延性を有する強磁性金属材料を用いた場
合には、ボールミルなどで機械的力を作用させることに
より球状粒子を偏平化することができる。このような偏
平化処理は、湿式法でも乾式法でも行なうことができる
が、湿式法では強磁性金属材料の酸化を防ぐために有機
溶剤を用いる必要があるので、取り扱いが面倒でコスト
アップを招く。一方、乾式法では偏平化が不十分となり
やすく、高透磁率の圧粉コアが得られにくい。When a ferromagnetic metal material having spreadability is used, spherical particles can be flattened by applying a mechanical force with a ball mill or the like. Such flattening treatment can be performed by either a wet method or a dry method. However, in the wet method, it is necessary to use an organic solvent in order to prevent the ferromagnetic metal material from being oxidized, and therefore the handling is troublesome and the cost is increased. On the other hand, in the dry method, flattening tends to be insufficient, and it is difficult to obtain a dust core having high magnetic permeability.
【０００４】[0004]
【発明が解決しようとする課題】本発明はこのような事
情からなされたものであり、高透磁率の圧粉コアを安価
に提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made under the circumstances as described above, and an object thereof is to provide a dust core having a high magnetic permeability at a low cost.
【０００５】[0005]
【課題を解決するための手段】このような目的は、下記
（１）〜（８）の本発明により達成される。 （１）強磁性金属粒子を乾式法で機械的に偏平化する偏
平化工程と、偏平化された強磁性金属粒子とバインダと
を混練して圧粉コア材料を製造するバインダ混練工程
と、圧粉コア材料を圧縮成形する成形工程とを有し、偏
平化工程において、強磁性金属粒子に常温で固体の有機
潤滑剤を混合して偏平化を行なうことを特徴とする圧粉
コアの製造方法。 （２）有機潤滑剤がショウノウを含む上記（１）の圧粉
コアの製造方法。 （３）有機潤滑剤がワックス、脂肪酸塩および脂肪酸の
少なくとも１種を含む上記（１）または（２）の圧粉コ
アの製造方法。 （４）偏平化工程において、強磁性金属粒子１００重量
部に対し有機潤滑剤を０．０５〜２重量部混合する上記
（１）ないし（３）のいずれかの圧粉コアの製造方法。 （５）ボールミル、ロッドミル、振動ミルまたはアトリ
ションミルにより強磁性金属粒子を偏平化する上記
（１）ないし（４）のいずれかの圧粉コアの製造方法。 （６）バインダが水ガラスを含む上記（１）ないし
（５）のいずれかの圧粉コアの製造方法。 （７）偏平化工程とバインダ混練工程との間に、加熱に
より有機潤滑剤を除去する工程を有する上記（１）ない
し（６）のいずれかの圧粉コアの製造方法。 （８）偏平化工程とバインダ混練工程との間に、減圧雰
囲気下におくことにより有機潤滑剤を除去する工程を有
する上記（１）ないし（７）のいずれかの圧粉コアの製
造方法。These objects are achieved by the present invention described in (1) to (8) below. (1) A flattening step of mechanically flattening ferromagnetic metal particles by a dry method, a binder kneading step of kneading the flattened ferromagnetic metal particles and a binder to produce a dust core material, and A method for producing a powder core, comprising a compression step of compression-molding a powder core material, wherein the flattening step comprises mixing ferromagnetic metal particles with a solid organic lubricant at room temperature to perform flattening. . (2) The method for producing a dust core according to (1) above, wherein the organic lubricant contains camphor. (3) The method for producing a powder core according to (1) or (2) above, wherein the organic lubricant contains at least one of wax, fatty acid salt and fatty acid. (4) The method for producing a dust core according to any one of (1) to (3), wherein, in the flattening step, 0.05 to 2 parts by weight of an organic lubricant is mixed with 100 parts by weight of the ferromagnetic metal particles. (5) The method for producing a dust core according to any one of (1) to (4) above, wherein the ferromagnetic metal particles are flattened by a ball mill, a rod mill, a vibration mill or an attrition mill. (6) The method for producing a dust core according to any one of the above (1) to (5), wherein the binder contains water glass. (7) The method for producing a dust core according to any one of the above (1) to (6), which has a step of removing the organic lubricant by heating between the flattening step and the binder kneading step. (8) The method for producing a dust core according to any one of the above (1) to (7), which comprises a step of removing the organic lubricant by placing it under a reduced pressure atmosphere between the flattening step and the binder kneading step.
【０００６】[0006]
【作用および効果】本発明では、強磁性金属粒子を機械
的に偏平化する際にショウノウやワックスなどの有機潤
滑剤を偏平化助剤として用いるので、乾式法でも十分な
偏平化が可能となり、高透磁率の圧粉コアが低コストで
実現する。In the present invention, since an organic lubricant such as camphor or wax is used as a flattening aid when mechanically flattening the ferromagnetic metal particles, sufficient flattening is possible even in the dry method. A powder core with high magnetic permeability is realized at low cost.
【０００７】[0007]
【具体的構成】以下、本発明の具体的構成について詳細
に説明する。Specific Structure The specific structure of the present invention will be described in detail below.
【０００８】本発明の圧粉コアの製造方法の主要な構成
を、図１に示す。FIG. 1 shows the main structure of the method for producing a dust core of the present invention.
【０００９】本発明で用いる強磁性金属粒子は、Ｆｅ系
強磁性金属粒子であることが好ましい。Ｆｅ系強磁性金
属粒子としては、Ｆｅ、Ｆｅ−Ａｌ−Ｓｉ（センダス
ト）、Ｆｅ−Ｎｉ（パーマロイ）、Ｆｅ−Ｃｏ、Ｆｅ−
Ｓｉ、Ｆｅ−Ｍｏ−Ｎｉ（スーパーマロイ）等の少なく
とも１種であり、これらから適宜選択すればよい。ま
た、平均粒子径は３０〜３００μm 程度とすることが好
ましい。強磁性金属粒子の製造方法は特に限定されず、
水アトマイズ法、ガスアトマイズ法等のアトマイズ法
や、還元法などから適宜選択すればよい。The ferromagnetic metal particles used in the present invention are preferably Fe-based ferromagnetic metal particles. As the Fe-based ferromagnetic metal particles, Fe, Fe-Al-Si (sendust), Fe-Ni (permalloy), Fe-Co, Fe-
It is at least one kind of Si, Fe-Mo-Ni (supermalloy), etc., and may be appropriately selected from these. The average particle size is preferably about 30 to 300 μm. The method for producing the ferromagnetic metal particles is not particularly limited,
It may be appropriately selected from an atomizing method such as a water atomizing method and a gas atomizing method, and a reducing method.
【００１０】本発明では、強磁性金属粒子に有機潤滑剤
を混合した後、強磁性金属粒子を乾式法で機械的に偏平
化する。有機潤滑剤としては、偏平化処理後に容易に取
り除けることから昇華性を有するものが好ましく、特
に、バインダとして用いられる水ガラスに対する濡れ性
が比較的良好であることから、ショウノウが好ましい。
ただし、パラフィンワックス、マイクロワックス、ポリ
エチレンワックス等の各種ワックス、あるいは、ステア
リン酸等の高級脂肪酸やその塩など、常温で固体の各種
有機潤滑剤も偏平化助剤として有効である。なお、有機
潤滑剤は２種以上を併用してもよい。In the present invention, after the ferromagnetic metal particles are mixed with the organic lubricant, the ferromagnetic metal particles are mechanically flattened by a dry method. As the organic lubricant, one having sublimability is preferable because it can be easily removed after the flattening treatment, and camphor is particularly preferable because it has relatively good wettability with water glass used as a binder.
However, various waxes such as paraffin wax, microwax and polyethylene wax, and various organic lubricants which are solid at room temperature such as stearic acid and higher fatty acids and salts thereof are also effective as flattening aids. Two or more organic lubricants may be used in combination.
【００１１】有機潤滑剤は、強磁性金属粒子１００重量
部に対し０．０５〜２重量部混合することが好ましい。
有機潤滑剤の量が少なすぎると偏平化が不十分になりや
すく、多すぎると偏平化処理装置内部への粒子の付着が
多くなり、回収率が悪くなる。The organic lubricant is preferably mixed in an amount of 0.05 to 2 parts by weight with respect to 100 parts by weight of the ferromagnetic metal particles.
If the amount of the organic lubricant is too small, the flattening tends to be insufficient, and if it is too large, the amount of particles attached to the inside of the flattening apparatus increases and the recovery rate deteriorates.
【００１２】偏平化手段は特に限定されないが、ボール
ミル、ロッドミル、振動ミル、アトリションミル等の圧
延・剪断作用をもつ手段を用いることが好ましい。偏平
化処理の時間は、用いる手段や処理量などによって異な
るので、適宜決定すればよい。偏平化率は特に限定され
ないが、通常、アスペクト比（径／厚さ）で５〜１５程
度とすることが好ましい。The flattening means is not particularly limited, but it is preferable to use means having a rolling / shearing action such as a ball mill, a rod mill, a vibration mill and an attrition mill. The time for the flattening process varies depending on the means used, the amount of processing, etc., and may be appropriately determined. The flattening ratio is not particularly limited, but it is usually preferable that the aspect ratio (diameter / thickness) is about 5 to 15.
【００１３】偏平化工程の後、有機潤滑剤を除去せずに
バインダと混練してもよいが、有機潤滑剤とバインダと
の濡れ性が良好でない場合には、バインダによる絶縁効
果が不十分となって高周波での透磁率が低下することが
ある。したがって、このような場合には、有機潤滑剤を
除去してからバインダと混練することが好ましい。具体
的には、有機潤滑剤としてワックスを用い、バインダと
して水ガラスを用いたときに濡れ性が比較的悪くなる。
ワックスは、２５０〜４５０℃程度の熱処理により除去
することができる。この場合の熱処理時間は、１〜３時
間程度とすることが好ましい。ワックス除去のための熱
処理温度は高いので、偏平化の際に生じた強磁性金属粒
子のストレスを解放する焼鈍効果も実現する。ただし、
温度が高いので非酸化性雰囲気中で熱処理を行なう必要
があり、低コスト化は難しくなる。After the flattening step, the organic lubricant may be kneaded with the binder without being removed, but if the wettability between the organic lubricant and the binder is not good, the insulating effect of the binder is insufficient. As a result, the magnetic permeability at high frequencies may decrease. Therefore, in such a case, it is preferable to remove the organic lubricant and then knead with the binder. Specifically, when wax is used as the organic lubricant and water glass is used as the binder, the wettability becomes relatively poor.
The wax can be removed by heat treatment at about 250 to 450 ° C. The heat treatment time in this case is preferably about 1 to 3 hours. Since the heat treatment temperature for removing the wax is high, an annealing effect for releasing the stress of the ferromagnetic metal particles generated during the flattening is also realized. However,
Since the temperature is high, it is necessary to perform heat treatment in a non-oxidizing atmosphere, which makes cost reduction difficult.
【００１４】一方、ショウノウは水ガラスとの濡れ性が
比較的良好であるため、除去しなくても高周波特性の低
下は少ない。ただし、ショウノウを使った場合でも除去
することにより特性は向上する。ショウノウは昇華性を
有するため、特に除去処理を施さない場合でも常温で放
置することにより昇華するが、８０〜１５０℃程度の低
温での加熱や減圧下での放置、あるいはこれらの併用に
より短時間で除去することができる。ショウノウは低温
で除去できるため、除去時の雰囲気を非酸化性とする必
要がなく、低コスト化に貢献する。On the other hand, since camphor has a relatively good wettability with water glass, the deterioration of high frequency characteristics is small even if it is not removed. However, even when camphor is used, the characteristics are improved by removing it. Since camphor has a subliming property, it is sublimated by leaving it at room temperature even if it is not subjected to a removing treatment. Can be removed with. Since camphor can be removed at a low temperature, the atmosphere at the time of removal does not need to be non-oxidizing, which contributes to cost reduction.
【００１５】偏平化処理後、強磁性金属粒子をバインダ
と混練して、圧粉コア材料とする。用いるバインダは特
に限定されず、水ガラス（アルカリ−ケイ酸系ガラスの
濃厚水溶液）やフェノール樹脂、シリコーン樹脂など、
圧粉コアに用いられる通常のバインダから選択すること
ができるが、コアの焼鈍後の絶縁性が良好であることか
ら水ガラスを用いることが好ましい。また、特願平４−
３５４５０１号に開示されているように、水ガラスとガ
ラス粉末との混合物をバインダとして用いることも好ま
しい。After the flattening treatment, the ferromagnetic metal particles are kneaded with a binder to obtain a powder core material. The binder used is not particularly limited, and water glass (concentrated aqueous solution of alkali-silicate glass), phenol resin, silicone resin, etc.
The binder can be selected from the usual binders used for dust cores, but it is preferable to use water glass because the insulating property after annealing of the core is good. Also, Japanese Patent Application No. 4-
It is also preferred to use a mixture of water glass and glass powder as a binder, as disclosed in 354501.
【００１６】強磁性金属粒子とバインダとを混練した
後、必要に応じて乾燥、解砕、整粒等を行なう。After kneading the ferromagnetic metal particles and the binder, drying, crushing, sizing, etc. are carried out if necessary.
【００１７】強磁性金属粒子には、バインダの他に、成
形時の粒子間の潤滑性を高めたり、金型からの離型性を
向上させたりするために、通常、圧粉コア材料中には各
種潤滑剤が添加される。潤滑剤には通常用いられている
各種のものが選択でき、例えば二硫化モリブデン、ステ
アリン酸、ステアリン酸亜鉛などから適宜選択すればよ
い。In addition to the binder, the ferromagnetic metal particles are usually added to the powder core material in order to enhance the lubricity between particles during molding and to improve the mold releasability from the mold. Various lubricants are added. As the lubricant, various kinds of commonly used ones can be selected, and for example, molybdenum disulfide, stearic acid, zinc stearate, etc. may be appropriately selected.
【００１８】圧粉コア材料は、圧縮成形によりトロイダ
ル状等の所望の形状とされる。成形条件は特に限定され
ず、強磁性金属粒子の種類、目的とする寸法や密度など
に応じて適宜決定すればよいが、通常、最大圧力は３〜
１０ton/cm2 程度、圧力保持時間は０．１秒間〜１分間
程度とする。The powder core material is formed into a desired shape such as a toroidal shape by compression molding. The molding conditions are not particularly limited and may be appropriately determined according to the type of ferromagnetic metal particles, the desired size and density, etc., but the maximum pressure is usually 3 to
The pressure holding time is about 10 ton / cm 2 , and the pressure holding time is about 0.1 second to 1 minute.
【００１９】成形後、必要に応じて焼鈍処理を施す。こ
の焼鈍処理は、偏平化の際に強磁性金属粒子に生じたス
トレスを解放するために施され、また、圧縮成形の際に
生じたストレスを解放する作用も有する。焼鈍処理の条
件は、強磁性金属粒子の種類や偏平化の際の条件などに
応じて適宜決定すればよいが、通常、保持温度は３００
〜６００℃とすることが好ましく、温度保持時間は３０
分間〜２時間とすることが好ましい。After the forming, an annealing treatment is applied if necessary. This annealing treatment is performed to release the stress generated in the ferromagnetic metal particles during flattening, and also has the function of releasing the stress generated during compression molding. The annealing condition may be appropriately determined according to the type of the ferromagnetic metal particles and the conditions for flattening, but the holding temperature is usually 300.
It is preferable to set the temperature to ~ 600 ° C, and the temperature holding time is 30
It is preferable that the time is from 2 minutes to 2 hours.
【００２０】[0020]
【実施例】以下、本発明の具体的実施例を示し、本発明
をさらに詳細に説明する。EXAMPLES The present invention will be described in more detail below by showing specific examples of the present invention.
【００２１】水アトマイズ法により製造した平均粒子径
１００μm のＦｅ粒子に、乾式ボールミルにより偏平化
処理を施した。偏平化率を測定することが困難なため、
偏平化の度合いを嵩密度で判断した。嵩密度は、偏平化
処理後のＦｅ粒子を容器に入れて数回タップさせ、密度
が最も上がった状態で測定した。有機潤滑剤としてはシ
ョウノウを用い、Ｆｅ粒子１００重量部に対し０．４重
量部混合した。また、比較のために、ショウノウを混合
せずに偏平化処理を行なったＦｅ粒子についても嵩密度
を測定した。Fe particles having an average particle diameter of 100 μm produced by the water atomizing method were subjected to flattening treatment by a dry ball mill. Since it is difficult to measure the flattening rate,
The degree of flattening was judged by the bulk density. The bulk density was measured in a state where the flattened Fe particles were put in a container and tapped several times to obtain the highest density. As an organic lubricant, camphor was used, and 0.4 part by weight was mixed with 100 parts by weight of Fe particles. For comparison, the bulk density was also measured for the Fe particles that were flattened without mixing camphor.
【００２２】この結果、ショウノウを用いて偏平化処理
を施したＦｅ粒子では嵩密度が２．０g/cm3 であった
が、ショウノウを用いなかったＦｅ粒子では２．７g/cm
3 であり、ショウノウによる偏平化促進効果が確認され
た。また、ショウノウに替えて同重量のポリエチレンワ
ックスを用いて偏平化処理を行なったところ、ショウノ
ウを用いた場合と同等の嵩密度が得られた。As a result, the Fe particles that had been subjected to the flattening treatment with camphor had a bulk density of 2.0 g / cm 3 , but the Fe particles that did not use camphor had a bulk density of 2.7 g / cm 3.
It was 3 , and the flattening promoting effect of camphor was confirmed. Further, when the flattening treatment was carried out using the same weight of polyethylene wax instead of camphor, the same bulk density as when camphor was used was obtained.
【００２３】続いて、有機潤滑剤を除去せずに、Ｆｅ粒
子１００重量部を水ガラス１．５重量部およびガラス粉
末１．５重量部と混練し、コア材料とした。得られたコ
ア材料を圧縮成形し、トロイダル状の圧粉コアとした。
コアの寸法は外径１７．５mm、内径１０．２mm、厚さ
６．２mmとした。Subsequently, without removing the organic lubricant, 100 parts by weight of Fe particles were kneaded with 1.5 parts by weight of water glass and 1.5 parts by weight of glass powder to obtain a core material. The obtained core material was compression molded into a toroidal powder core.
The dimensions of the core were an outer diameter of 17.5 mm, an inner diameter of 10.2 mm and a thickness of 6.2 mm.
【００２４】これらのコアに５２０℃で１時間焼鈍処理
を施した後、透磁率の周波数特性を測定した。結果を表
１に示す。After these cores were annealed at 520 ° C. for 1 hour, the frequency characteristics of magnetic permeability were measured. The results are shown in Table 1.
【００２５】また、偏平化後に有機潤滑剤を除去した他
は上記と同様にしてコアを製造した。ショウノウの除去
は、空気中において１２０℃で２時間熱処理することに
より行ない、ワックスの除去は、Ａｒ雰囲気中において
３５０℃で２時間熱処理することにより行なった。これ
らについても透磁率の周波数特性を測定した。結果を表
１に示す。A core was manufactured in the same manner as above except that the organic lubricant was removed after flattening. The camphor was removed by heat treatment in air at 120 ° C. for 2 hours, and the wax was removed by heat treatment in Ar atmosphere at 350 ° C. for 2 hours. The frequency characteristics of magnetic permeability were also measured for these. The results are shown in Table 1.
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１に示される結果から本発明の効果が明
らかである。すなわち、偏平化処理の際に有機潤滑剤を
添加して製造されたコアは、無添加のコアよりも透磁率
が高い。そして、有機潤滑剤を除去しないで水ガラスと
混練した場合、ショウノウを添加して製造されたコア
は、ワックスを添加して製造されたコアよりも高周波で
の透磁率が高い。これは、ショウノウと水ガラスとの濡
れ性が比較的良好であるためと考えられる。また、有機
潤滑剤を除去した場合には、ショウノウを添加したもの
もワックスを添加したものもさらに透磁率が向上する
が、特にワックス添加の場合に向上率が大きい。これ
は、ワックス除去の際の熱処理が焼鈍のはたらきを示し
たためと考えられる。From the results shown in Table 1, the effect of the present invention is clear. That is, the core manufactured by adding the organic lubricant during the flattening treatment has a higher magnetic permeability than the core without the additive. When kneaded with water glass without removing the organic lubricant, the core produced by adding camphor has a higher magnetic permeability at high frequencies than the core produced by adding wax. It is considered that this is because the wettability between camphor and water glass is relatively good. Further, when the organic lubricant is removed, the magnetic permeability is further improved both in the case of adding camphor and in the case of adding wax, but the improvement rate is particularly large when wax is added. It is considered that this is because the heat treatment for removing the wax showed the function of annealing.
【００２８】なお、有機潤滑剤としてステアリン酸亜鉛
を用いたところ、ワックスを用いた場合とほぼ同等の結
果が得られた。When zinc stearate was used as the organic lubricant, almost the same results as when wax was used were obtained.
【図１】本発明の圧粉コアの製造方法の構成例を示すフ
ローチャートである。FIG. 1 is a flowchart showing a configuration example of a method for producing a dust core of the present invention.
Claims (8)
化する偏平化工程と、偏平化された強磁性金属粒子とバ
インダとを混練して圧粉コア材料を製造するバインダ混
練工程と、圧粉コア材料を圧縮成形する成形工程とを有
し、偏平化工程において、強磁性金属粒子に常温で固体
の有機潤滑剤を混合して偏平化を行なうことを特徴とす
る圧粉コアの製造方法。1. A flattening step of mechanically flattening ferromagnetic metal particles by a dry method, and a binder kneading step of kneading the flattened ferromagnetic metal particles and a binder to produce a dust core material. , A compacting step of compressing and compacting a powder core material, and in the flattening step, flattening is carried out by mixing ferromagnetic metal particles with an organic lubricant solid at room temperature. Production method.
の圧粉コアの製造方法。2. The organic lubricant comprises camphor.
Method for manufacturing dust core of.
脂肪酸の少なくとも１種を含む請求項１または２の圧粉
コアの製造方法。3. The method for producing a dust core according to claim 1, wherein the organic lubricant contains at least one of wax, fatty acid salt and fatty acid.
００重量部に対し有機潤滑剤を０．０５〜２重量部混合
する請求項１ないし３のいずれかの圧粉コアの製造方
法。4. The ferromagnetic metal particles 1 in the flattening step.
The method for producing a dust core according to claim 1, wherein 0.05 to 2 parts by weight of an organic lubricant is mixed with 100 parts by weight.
はアトリションミルにより強磁性金属粒子を偏平化する
請求項１ないし４のいずれかの圧粉コアの製造方法。5. The method for producing a dust core according to claim 1, wherein the ferromagnetic metal particles are flattened by a ball mill, a rod mill, a vibration mill or an attrition mill.
し５のいずれかの圧粉コアの製造方法。6. The method for producing a dust core according to claim 1, wherein the binder contains water glass.
に、加熱により有機潤滑剤を除去する工程を有する請求
項１ないし６のいずれかの圧粉コアの製造方法。7. The method for producing a dust core according to claim 1, further comprising a step of removing the organic lubricant by heating between the flattening step and the binder kneading step.
に、減圧雰囲気下におくことにより有機潤滑剤を除去す
る工程を有する請求項１ないし７のいずれかの圧粉コア
の製造方法。8. The method for producing a dust core according to claim 1, further comprising a step of removing the organic lubricant by placing it under a reduced pressure atmosphere between the flattening step and the binder kneading step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5085706A JPH06275452A (en) | 1993-03-19 | 1993-03-19 | Manufacture of dust core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5085706A JPH06275452A (en) | 1993-03-19 | 1993-03-19 | Manufacture of dust core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06275452A true JPH06275452A (en) | 1994-09-30 |
Family
ID=13866275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5085706A Pending JPH06275452A (en) | 1993-03-19 | 1993-03-19 | Manufacture of dust core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06275452A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106758A (en) * | 1991-08-13 | 2000-08-22 | Saint-Gobain Vitrage International | Process and device for duplicate molding of a glazing |
| WO2006006545A1 (en) * | 2004-07-09 | 2006-01-19 | Toyota Jidosha Kabushiki Kaisha | Dust core and its manufacturing method |
| JP2021093405A (en) * | 2019-12-06 | 2021-06-17 | 株式会社タムラ製作所 | Method of manufacturing dust core |
-
1993
- 1993-03-19 JP JP5085706A patent/JPH06275452A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106758A (en) * | 1991-08-13 | 2000-08-22 | Saint-Gobain Vitrage International | Process and device for duplicate molding of a glazing |
| WO2006006545A1 (en) * | 2004-07-09 | 2006-01-19 | Toyota Jidosha Kabushiki Kaisha | Dust core and its manufacturing method |
| JP2021093405A (en) * | 2019-12-06 | 2021-06-17 | 株式会社タムラ製作所 | Method of manufacturing dust core |
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