JPH11234971A - Core manufacture and low iron-loss core - Google Patents

Core manufacture and low iron-loss core

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Publication number
JPH11234971A
JPH11234971A JP10028867A JP2886798A JPH11234971A JP H11234971 A JPH11234971 A JP H11234971A JP 10028867 A JP10028867 A JP 10028867A JP 2886798 A JP2886798 A JP 2886798A JP H11234971 A JPH11234971 A JP H11234971A
Authority
JP
Japan
Prior art keywords
core
steel sheet
annealing
oriented electrical
grain size
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.)
Granted
Application number
JP10028867A
Other languages
Japanese (ja)
Other versions
JP2991690B2 (en
Inventor
Hiromichi Koshiishi
弘道 輿石
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.)
KYUSHU DENJIKOU CENTER KK
Original Assignee
KYUSHU DENJIKOU CENTER KK
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Priority to JP10028867A priority Critical patent/JP2991690B2/en
Publication of JPH11234971A publication Critical patent/JPH11234971A/en
Application granted granted Critical
Publication of JP2991690B2 publication Critical patent/JP2991690B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Manufacturing Of Steel Electrode Plates (AREA)
  • Heat Treatment Of Articles (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

PROBLEM TO BE SOLVED: To attain a core with excellent magnetic properties by using, as its material, semi-processed non-oriented magnetic steel sheets and strip with excellent properties required by a core material. SOLUTION: A core body is formed by layering semi-processed non-oriented magnetic steel sheets and strip where non-oriented magnetic steel sheets and strip raw plate with resistivity of 35 Ω.m×10<-8> or higher formed by adding such an element that will not inhibit the growth of crystal grains at the time of annealing, are tempered so as to have a crystal grain size range of 5 to 50 μm by means of recrystallization annealing, and the core body is annealed at a temperature which allows the crystal grain size range of the steel sheet to grow to be 100 to 200 μm. By using a material with excellent processing performance at the time of punching, and cutting performance at the time of cutting, generation of defective parts can be decreased, thus it is possible to improve magnetic properties further by annealing the core body.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、セミプロセス無方
向性電磁鋼板を材料とするコアの製造方法およびこの方
法により製造したコアに関し、詳しくは、所定形状に打
ち抜かれた無方向性電磁鋼板を積層してコア体を形成
し、このコア体を焼鈍して磁気特性を向上させるコアの
製造方法およびこの方法により製造したコアに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a core using a semi-process non-oriented electrical steel sheet and a core manufactured by this method. The present invention relates to a method for manufacturing a core in which a core body is formed by laminating, and the core body is annealed to improve magnetic properties, and a core manufactured by this method.

【0002】[0002]

【従来の技術】近年、環境、資源問題から電気機器に対
し省エネルギー、高効率化の要請が高まり、モータやト
ランスにとってもその効率向上は最大の要求である。こ
のためには鉄損や銅損、機械損を減少させることが必要
で、このようなモータやトランスのコアとして、無方向
性電磁鋼板の積層物が使用されている。
2. Description of the Related Art In recent years, there has been an increasing demand for electric equipment to save energy and increase efficiency due to environmental and resource issues. Improvement of efficiency is the greatest demand for motors and transformers. For this purpose, it is necessary to reduce iron loss, copper loss, and mechanical loss, and a laminate of non-oriented electrical steel sheets is used as the core of such a motor or transformer.

【0003】この無方向性電磁鋼板は、所定の化学成分
に調整された熱延板に1回または複数回の焼鈍を含む冷
間圧延を施して製造され、特に近年、磁気特性を向上さ
せるために、Si、Al、P、Mnなどを添加して、固
有抵抗を35Ω・m×10-8以上としたいわゆる高合金
分野の無方向性電磁鋼板が開発されている。
[0003] This non-oriented electrical steel sheet is manufactured by subjecting a hot-rolled sheet adjusted to a predetermined chemical composition to cold rolling including one or more annealings. Non-oriented electrical steel sheets in the so-called high alloy field having a specific resistance of 35 Ω · m × 10 −8 or more by adding Si, Al, P, Mn, etc.

【0004】モータコアは、無方向性電磁鋼板のフープ
に打ち抜き油を塗布した状態で所定形状にプレスで打ち
抜き、これを多数積層してカシメあるいは溶接により固
着して製造される。さらに付着した打ち抜き油を除去す
るため加熱処理が行われ、さらにその後、再焼鈍が行わ
れる。このように、コア体を形成後再度焼鈍する製造方
法をセミプロセス式製造法といい、一方、コア体形成後
再焼鈍を行わない製造方法をフルプロセス式製造法とい
う。
A motor core is manufactured by punching a hoop of a non-oriented electrical steel sheet with a press in a predetermined shape in a state where a punching oil is applied, laminating a large number of them, and fixing them by caulking or welding. Further, heat treatment is performed to remove the attached punching oil, and thereafter, re-annealing is performed. The manufacturing method in which the core body is formed and then re-annealed is called a semi-process type manufacturing method, while the manufacturing method in which re-annealing is not performed after the core body is formed is called a full process type manufacturing method.

【0005】コア体の焼鈍の目的は、第一義的には打ち
抜き時に生じた歪みの除去にあり、同時に結晶粒の成長
を促進して磁気特性の向上を図ることにある。この焼鈍
は、たとえば特開昭54−1803号公報や特開昭63
−39444号公報に記載のように、非酸化性ないし還
元性雰囲気のもとで、均熱温度約750℃で約2時間保
持の条件で行われている。
[0005] The purpose of annealing the core body is primarily to remove distortion generated at the time of punching, and at the same time, to promote the growth of crystal grains to improve the magnetic characteristics. This annealing is performed, for example, in Japanese Patent Application Laid-Open Nos.
As described in JP-A-39444, the heat treatment is performed under a non-oxidizing or reducing atmosphere at a soaking temperature of about 750 ° C. for about 2 hours.

【0006】従来のモータコアの焼鈍において、焼鈍炉
の炉内雰囲気を非酸化性ないし還元性雰囲気としている
のは、付着した打ち抜き油を除去するための加熱処理を
行った後、焼鈍中に電磁鋼板の表面が酸化されないよう
にするためであり、このときに用いる雰囲気ガスは、窒
素ガスを主体とし、これに水素ガスあるいはCOガスを
混合したものが一般的である。
[0006] In the conventional annealing of a motor core, the atmosphere in the annealing furnace is set to a non-oxidizing or reducing atmosphere because a heat treatment for removing attached punching oil is performed, and then the electrical steel sheet is treated during annealing. The atmosphere gas used at this time is mainly a nitrogen gas and a mixture of a hydrogen gas and a CO gas.

【0007】[0007]

【発明が解決しようとする課題】ところで、モータやト
ランスのコアの材料としての無方向性電磁鋼板には、磁
気特性のみならず、コアの製造時における加工性の向上
や不良品の発生を極力防ぐ安定した性能が要求される。
具体的には、適当な硬度があること、フラットネス
が良いこと、靭性が強いこと、バイトによる切削性
が良いこと、打ち抜き性が良いこと、焼鈍時スティ
ッキングしないことなどである。
By the way, non-oriented electrical steel sheets as a material for a motor or transformer core not only improve the magnetic properties, but also improve the workability and the occurrence of defective products in the manufacture of the core. Stable performance to prevent this is required.
Specifically, it has appropriate hardness, good flatness, high toughness, good cutting property with a cutting tool, good punching property, and no sticking during annealing.

【0008】このなかで、の硬度については、冷間圧
延後の再結晶焼鈍により適当な硬度範囲を得ることがで
き、のフラットネスについても、冷間圧延及びその後
の再結晶焼鈍により実用的に支障のない範囲のフラット
ネスを得ることができる。また、の打ち抜き性及び
のスティッキングについては、電磁鋼板の表面に焼き付
けられるコーティングによってコントロールすることが
できる。
[0008] Among these, an appropriate hardness range can be obtained by recrystallization annealing after cold rolling, and the flatness can be practically reduced by cold rolling and subsequent recrystallization annealing. Flatness in a range that does not hinder can be obtained. In addition, the punching property and sticking can be controlled by coating baked on the surface of the electromagnetic steel sheet.

【0009】しかし、の靱性との切削性について
は、従来の無方向性電磁鋼板においては必ずしも充分な
性能が得られておらず、改善の余地があった。靱性は、
自動カシメ方式でコアを打ち抜くときに関係する特性で
あり、靱性が低いとカシメ部にクラックが生じて不良品
となる。また、切削性は、回転子コアの外周を旋盤で切
削するときに関係する特性であり、切削性が良くないと
切削した面が凹凸状となる。この靱性と切削性はともに
再結晶焼鈍後の電磁鋼板の粒径範囲に依存するところが
大きく、粒径が大き過ぎると靱性と切削性は低くなる。
However, with respect to the toughness and the machinability, conventional non-oriented electrical steel sheets have not always achieved sufficient performance, and there is room for improvement. The toughness is
This is a characteristic related to punching of a core by an automatic caulking method. If the core is low in toughness, cracks occur in the caulked portion, resulting in a defective product. In addition, the machinability is a characteristic related to cutting the outer periphery of the rotor core with a lathe, and if the machinability is not good, the cut surface becomes uneven. Both the toughness and machinability largely depend on the grain size range of the electrical steel sheet after recrystallization annealing, and if the grain size is too large, the toughness and machinability decrease.

【0010】一方、モータやトランスのコアの焼鈍にお
いて、前記したように、均熱温度は一般に750℃が採
用されているが、この理由は、均熱温度を750℃より
高くした場合、磁気特性が逆に劣化することがあること
から、経験的に高温焼鈍を避けていることによる。しか
し、この均熱温度と磁気特性との関係については、材料
である電磁鋼板の特性との関係も含めた解析がまだ充分
に行われていないというのが実情であり、この解析を進
めることによって、コアの磁気特性をより向上させるこ
とが期待できる。
On the other hand, in annealing the core of a motor or a transformer, as described above, the soaking temperature is generally 750 ° C. The reason for this is that if the soaking temperature is higher than 750 ° C. Is conversely deteriorated, so that high-temperature annealing is empirically avoided. However, as for the relationship between the soaking temperature and the magnetic properties, the analysis including the relationship with the properties of the electrical steel sheet, which is the material, has not yet been sufficiently analyzed. It can be expected that the magnetic properties of the core are further improved.

【0011】本発明が解決すべき課題は、コアの材料と
して要求される特性に優れたセミプロセス無方向性電磁
鋼板を材料として、より磁気特性の優れたコアを得るこ
とにある。
The problem to be solved by the present invention is to obtain a core having more excellent magnetic properties by using a semi-process non-oriented electrical steel sheet having excellent properties required as a material of the core.

【0012】[0012]

【課題を解決するための手段】本発明者は、前記したコ
アの材料としての電磁鋼板の靱性と切削性を向上させる
ための方策について研究を重ねた結果、従来の電磁鋼板
は、冷間圧延後の焼鈍により再結晶した粒径範囲が80
〜150μmであり、この結晶粒径範囲では靱性と切削
性の向上が得られず、結晶粒径をより小さくすることに
より、コアの材料としての電磁鋼板の靱性と切削性を向
上させ得ることを見いだした。
Means for Solving the Problems The present inventor has repeatedly studied on measures for improving the toughness and machinability of the above-mentioned magnetic steel sheet as a material of the core, and as a result, the conventional magnetic steel sheet has been cold-rolled. The particle size range recrystallized by subsequent annealing is 80
150150 μm, the improvement in toughness and machinability is not obtained in this crystal grain size range, and by making the crystal grain size smaller, it is possible to improve the toughness and machinability of the electrical steel sheet as the core material. I found it.

【0013】さらに、本発明者は、前記したモータやト
ランスのコアの焼鈍において、磁気特性をより一層向上
させるための焼鈍方法について研究を重ね、以下の知見
を得た。その第1は、従来の窒素ガスを主体とした炉内
雰囲気ガスのもとでの焼鈍において、均熱温度を従来一
般に採用されている750℃よりさらに高めていくと、
磁気特性がさらに向上することであり、その第2は、A
lを含有する無方向性電磁鋼板を材料としたコアの場合
は、均熱温度が850℃より高くなると逆に磁気特性が
劣化することである。
Further, the present inventor has conducted research on an annealing method for further improving magnetic characteristics in the above-described annealing of the core of the motor or the transformer, and has obtained the following knowledge. First, in the conventional annealing under a furnace atmosphere gas mainly composed of nitrogen gas, if the soaking temperature is further increased from 750 ° C. which is conventionally generally used,
The second is that the magnetic properties are further improved.
In the case of a core made of a non-oriented electrical steel sheet containing l, when the soaking temperature is higher than 850 ° C., the magnetic properties deteriorate.

【0014】均熱温度を750℃から800℃以上まで
高めたときの磁気特性の向上の原因は、結晶粒の成長が
促進されることにある。一方、Al含有鋼板を材料とし
たコアの場合に均熱温度が850℃より高くなると磁気
特性が劣化する原因については、本発明者の研究の結
果、鋼板に含有されるAlが雰囲気ガス中のNと反応し
てあらたなAlNが生成し、このAlNが焼鈍時の鋼板
表面近傍の結晶粒の成長を阻害しているためであること
が明らかになった。
The cause of the improvement in magnetic properties when the soaking temperature is increased from 750 ° C. to 800 ° C. or more is that the growth of crystal grains is promoted. On the other hand, as for the cause of the deterioration of the magnetic properties when the soaking temperature is higher than 850 ° C. in the case of the core using the Al-containing steel sheet as a material, as a result of the study of the present inventors, Al contained in the steel sheet was found to be in the atmosphere gas. It became clear that new AlN was formed by reacting with N, and this AlN was obstructing the growth of crystal grains near the steel sheet surface during annealing.

【0015】このことから、Alを含有しない無方向性
電磁鋼板を材料としたコアの場合は、窒素ガスを主体と
した雰囲気ガスのもとでも、均熱温度を750℃より高
くするほど磁気特性を向上させることができるが、Al
を含有する無方向性電磁鋼板を材料としたコアの焼鈍に
おいては、窒素ガスを主体とした雰囲気ガスでの焼鈍で
は均熱温度は850℃が上限となり、これ以上の磁気特
性の向上は望めないことが明らかになった。
[0015] Therefore, in the case of a core made of a non-oriented electrical steel sheet containing no Al, the magnetic properties become higher as the soaking temperature becomes higher than 750 ° C even in an atmosphere gas mainly containing nitrogen gas. Can be improved, but Al
In the annealing of a core made of a non-oriented electrical steel sheet containing, the upper limit of the soaking temperature is 850 ° C. in annealing with an atmosphere gas mainly composed of nitrogen gas, and further improvement in magnetic properties cannot be expected. It became clear.

【0016】このような知見に基き、本発明者はさらに
研究を重ねた結果、Alを含有する無方向性電磁鋼板を
材料としたコアの場合は、鋼板中に含まれるAlと窒化
反応を起こさない、HまたはArもしくはHとArの混
合ガス雰囲気中で焼鈍することにより、850℃以上の
高温域での結晶粒の成長を促進させて鉄損を大幅に低減
させ、磁気特性が大幅に向上したコアを得ることを可能
とした。
Based on these findings, the present inventors have conducted further studies. As a result, in the case of a core made of a non-oriented electrical steel sheet containing Al, a nitriding reaction with Al contained in the steel sheet occurs. No, by annealing in an atmosphere of H or Ar or a mixed gas of H and Ar, the growth of crystal grains in a high temperature region of 850 ° C. or higher is promoted, the iron loss is greatly reduced, and the magnetic properties are greatly improved. It was possible to obtain a core that was.

【0017】すなわち、本発明のコアの製造方法は、セ
ミプロセス無方向性電磁鋼板を材料とするコアの製造方
法であって、焼鈍時に結晶粒の成長を妨げない元素を添
加し固有抵抗を35Ω・m×10-8以上にした無方向性
電磁鋼板素板を、再結晶焼鈍により結晶粒径範囲を5〜
50μmに調質したセミプロセス無方向性電磁鋼板を積
層してコア体を形成した後、鋼板の結晶粒径範囲が10
0〜200μmに成長する温度で前記コア体を焼鈍する
ことを特徴とする。
That is, the method of manufacturing a core according to the present invention is a method of manufacturing a core using a semi-process non-oriented electrical steel sheet, wherein an element that does not hinder the growth of crystal grains during annealing is added to increase the specific resistance to 35Ω.・ A non-oriented electrical steel sheet with m × 10 -8 or more is subjected to recrystallization annealing to reduce the crystal grain size range from 5 to 5.
After laminating semi-process non-oriented electrical steel sheets tempered to 50 μm to form a core body, the crystal grain size range of the steel sheets is 10
The core is annealed at a temperature at which the core grows to 0 to 200 μm.

【0018】前記のセミプロセス無方向性電磁鋼板にお
いて、焼鈍時に結晶粒の成長を妨げない元素としては、
Si,Al,P,Mnのいずれか一つ以上を製鋼工程に
おいて添加することができる。また、再結晶焼鈍後の結
晶粒径範囲は、焼鈍温度と時間の適正な組合せにより5
〜50μmを達成することができる。連続焼鈍の場合、
温度750〜850℃、時間15〜30秒程度、たとえ
ば、800℃×30秒、あるいは850℃×15秒の連
続焼鈍が好適である。一般的には低温、短時間焼鈍によ
り結晶粒径を小さくすることができる。
In the semi-process non-oriented electrical steel sheet, the elements which do not hinder the growth of crystal grains during annealing include:
Any one or more of Si, Al, P, and Mn can be added in the steel making process. The range of the crystal grain size after the recrystallization annealing can be set to 5 by an appropriate combination of the annealing temperature and the time.
5050 μm can be achieved. In the case of continuous annealing,
Continuous annealing at a temperature of 750 to 850 ° C. and a time of about 15 to 30 seconds, for example, 800 ° C. × 30 seconds, or 850 ° C. × 15 seconds is suitable. Generally, the crystal grain size can be reduced by annealing at a low temperature for a short time.

【0019】再結晶焼鈍後の結晶粒径範囲が5〜50μ
mであるセミプロセス無方向性電磁鋼板は、コアの材料
として優れた靱性と切削性を有しており、この材料を使
用してコアを製作することにより、不良率を低減させる
ことができる。電磁鋼板の再結晶焼鈍後の結晶粒径は、
小さいほど靱性が良好となるが、結晶粒径が5μm未満
になると、再結晶不足となり、他方、結晶粒径が50μ
mを超えると脆くなり、積層コアのカシメの際に折れて
不良品となる率が急激に増加するので、結晶粒径範囲は
5〜50μm、より好ましくは5〜20μmとする。
The crystal grain size after recrystallization annealing is 5 to 50 μm.
The semi-process non-oriented electrical steel sheet having m is excellent in toughness and machinability as a material of the core, and by manufacturing the core using this material, the defect rate can be reduced. The crystal grain size after recrystallization annealing of electrical steel sheet is
The smaller the grain size, the better the toughness. However, if the crystal grain size is less than 5 μm, recrystallization is insufficient, while the crystal grain size is 50 μm.
If it exceeds m, it becomes brittle, and the rate of breakage of the laminated core at the time of caulking sharply increases, so the crystal grain size range is 5 to 50 μm, more preferably 5 to 20 μm.

【0020】この電磁鋼板を材料として積層したコア体
を焼鈍して、焼鈍後の結晶粒径範囲が100〜200μ
mになるようにするためのコア体の焼鈍条件としては、
焼鈍温度を800℃以上とすることが望ましい。焼鈍温
度が800℃未満であると、結晶粒の成長が不十分で、
焼鈍後の結晶粒径は100μmに達せず、磁気特性の向
上が望めない。なお、焼鈍温度の上限はとくに限定する
必要はないが、1000℃以上になると結晶粒が大きく
なり過ぎて逆に磁気特性が劣化するので、950℃以下
が望ましい。
A core body laminated using the magnetic steel sheet as a material is annealed to have a crystal grain size range of 100 to 200 μm after annealing.
The conditions for annealing the core body so as to obtain m are as follows:
It is desirable to set the annealing temperature to 800 ° C. or higher. When the annealing temperature is lower than 800 ° C., the growth of crystal grains is insufficient,
The crystal grain size after annealing does not reach 100 μm, and improvement in magnetic properties cannot be expected. The upper limit of the annealing temperature does not need to be particularly limited. However, if the temperature is higher than 1000 ° C., the crystal grains become too large and the magnetic properties are deteriorated.

【0021】焼鈍に用いる雰囲気ガスは、材料である電
磁鋼板中にAlを含有しない場合は従来同様に、窒素ガ
スを主体とし、これに水素ガスあるいはCOガスを混合
したガスを用いることもできる。しかし、Alを含有す
る電磁鋼板の場合には、コア体の焼鈍に用いる雰囲気ガ
スとして、鋼板中に含まれるAlと窒化反応を起こさな
いガスを用いることが、高温焼鈍における磁気特性の劣
化を回避するのに有効である。前記したように、Nを含
む雰囲気ガス中で高温焼鈍すると、鋼板に含有されるA
lが雰囲気ガス中のNと反応してあらたなAlNが生成
し、このAlNが焼鈍時の鋼板表面近傍の結晶粒の成長
を阻害するので、Nを含まない雰囲気ガスを用いること
が必要である。Nを含まない雰囲気ガスとしては、Hま
たはArもしくはHとArの混合ガスを主成分とするガ
スを用いることができる。
The atmosphere gas used for the annealing may be a gas mainly composed of nitrogen gas and a mixture of hydrogen gas and CO gas, as in the conventional case, when no Al is contained in the magnetic steel sheet as the material. However, in the case of an electromagnetic steel sheet containing Al, using a gas that does not cause a nitridation reaction with Al contained in the steel sheet as an atmosphere gas used for annealing the core body avoids deterioration of magnetic properties during high-temperature annealing. It is effective to do. As described above, when high-temperature annealing is performed in an atmosphere gas containing N, A
l reacts with N in the atmosphere gas to produce new AlN, and this AlN inhibits the growth of crystal grains near the steel sheet surface during annealing, so it is necessary to use an atmosphere gas containing no N. . As an atmosphere gas containing no N, a gas mainly containing H or Ar or a mixed gas of H and Ar can be used.

【0022】無方向性電磁鋼板の製造工程において、鋼
中のO(酸素)は鋼板焼鈍時の結晶粒成長を阻害し、磁
気特性を低下させるので、製鋼工程において脱酸のため
にAlが使用される。また、この脱酸用のAlに加え
て、鋼板の磁気特性を高めるためにさらにAlが添加さ
れる場合もある。脱酸に消費されたAlは鋼板中でいわ
ゆるinsolAlの形態で存在し、残りはsolAl
の形態で鋼板中に存在している。
In the manufacturing process of the non-oriented electrical steel sheet, O (oxygen) in the steel inhibits the growth of crystal grains during the annealing of the steel sheet and lowers the magnetic properties. Therefore, Al is used for deoxidation in the steel making process. Is done. Further, in addition to the Al for deoxidation, Al may be further added to enhance the magnetic properties of the steel sheet. Al consumed in deoxidation exists in the form of so-called insolAl in the steel sheet, and the rest is solAl
In the steel sheet.

【0023】このsolAlの形態で存在しているAl
は化学的に活性であり、焼鈍時の高温雰囲気ガス中にN
が存在すると、AlとNが反応してあらたなAlNを生
成する。このAlNは、焼鈍時の鋼板表面近傍の結晶粒
成長を阻害し、磁気特性の向上を抑制するという悪影響
を及ぼす。そこで本発明においては、Alを含有する電
磁鋼板(鋼板の磁気特性を高めるためにAlを添加した
電磁鋼板)を材料とするコアの場合には、焼鈍時の炉内
雰囲気ガスとして、鋼板中に含まれるAlと窒化反応を
起こさない雰囲気ガスを用いることにする。
Al present in the form of solAl
Is chemically active, and N2 is contained in the high-temperature atmosphere gas during annealing.
Is present, Al and N react to form new AlN. This AlN has an adverse effect of inhibiting the growth of crystal grains near the steel sheet surface during annealing and suppressing the improvement of magnetic properties. Therefore, in the present invention, in the case of a core made of a magnetic steel sheet containing Al (an electromagnetic steel sheet to which Al is added in order to enhance the magnetic properties of the steel sheet), the core is used as a furnace atmosphere gas during annealing. Atmosphere gas which does not cause a nitriding reaction with the contained Al is used.

【0024】以上のように、固有抵抗を35Ω・m×1
-8以上にした無方向性電磁鋼板素板を、再結晶焼鈍に
より結晶粒径範囲を5〜50μmに調質した無方向性電
磁鋼板を材料として使用することにより、打ち抜き時の
加工性や切削時の切削性が向上し、不良品の発生が低減
するとともに、鋼板の結晶粒径範囲が100〜200μ
mに成長する温度でコア体を焼鈍することにより、磁気
特性がより一層向上する。また、電磁鋼板がAlを含有
する鋼板の場合には、コア体の焼鈍に用いる雰囲気ガス
として、鋼板中に含まれるAlと窒化反応を起こさない
ガスを用いることにより、高温焼鈍における磁気特性の
劣化を生じることなく、磁気特性を向上させることがで
きる。
As described above, the specific resistance is 35 Ω · m × 1
0 non-oriented electrical steel sheet workpiece in which the -8 above, by using a non-oriented electrical steel sheet tempering the grain size range 5~50μm by recrystallization annealing the material, Ya workability during punching The machinability during cutting is improved, the occurrence of defective products is reduced, and the crystal grain size range of the steel sheet is 100 to 200 μm.
Annealing the core body at a temperature that grows to m further improves the magnetic properties. In addition, when the electromagnetic steel sheet is a steel sheet containing Al, by using a gas that does not cause a nitriding reaction with Al contained in the steel sheet as an atmosphere gas used for annealing the core body, deterioration of magnetic properties during high-temperature annealing is performed. The magnetic characteristics can be improved without causing the problem.

【0025】[0025]

【発明の実施の形態】以下、本発明の実施の形態を実験
例に基づいて説明する。表1は実験に使用した無方向性
電磁鋼板の化学成分(添加元素)と連続焼鈍後の鋼板の
特性を示す表であり、表2はこの電磁鋼板から製作した
コア体を焼鈍した後の磁気特性を示す表である。鋼板の
製造工程は、製鋼−熱間圧延−焼鈍−酸洗−冷間圧延−
連続焼鈍である。A1,B1,C1鋼板は、連続焼鈍条
件を従来より低温、短時間とした本発明にかかる電磁鋼
板であり、A2,B2,C2鋼板は従来の連続焼鈍条件
で焼鈍した鋼板(比較例)である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on experimental examples. Table 1 is a table showing the chemical components (additional elements) of the non-oriented electrical steel sheet used in the experiment and the properties of the steel sheet after continuous annealing. Table 2 shows the magnetic properties after annealing a core manufactured from this electromagnetic steel sheet. It is a table showing characteristics. The manufacturing process of the steel sheet is steelmaking-hot rolling-annealing-pickling-cold rolling-
Continuous annealing. A1, B1, and C1 steel sheets are electromagnetic steel sheets according to the present invention in which continuous annealing conditions are lower in temperature and time than conventional steel sheets, and A2, B2, and C2 steel sheets are steel sheets annealed under conventional continuous annealing conditions (comparative examples). is there.

【0026】[0026]

【表1】 [Table 1]

【0027】[0027]

【表2】 [Table 2]

【0028】表1および表2から明らかなように、本発
明にかかる電磁鋼板A1,B1,C1は、従来よりも低
温、短時間とした連続焼鈍により焼鈍後の結晶粒径を5
〜30μmとしたものであり、鋼板の磁気特性は高温、
長時間焼鈍した比較例の鋼板A2,B2,C2に比較し
てやや劣るものの、コア体製作時には不良の発生がな
く、かつ、コア体に加工した後の焼鈍後の磁気特性は、
比較例の鋼板A2,B2,C2と同等の特性を示してい
る。このことは、低温、短時間焼鈍により鋼板の連続焼
鈍におけるランニングコストを低減できるということで
あり、鋼板の製造コストの低減に大きく寄与する。
As is evident from Tables 1 and 2, the electrical steel sheets A1, B1, and C1 according to the present invention have a crystal grain size after annealing by continuous annealing at a lower temperature and for a shorter time than before.
3030 μm, and the magnetic properties of the steel sheet are high temperature,
Although slightly inferior to the steel sheets A2, B2 and C2 of the comparative example annealed for a long time, there was no failure at the time of manufacturing the core body, and the magnetic properties after annealing after processing into the core body were as follows:
It shows characteristics equivalent to those of the steel sheets A2, B2, and C2 of the comparative example. This means that running costs in continuous annealing of a steel sheet can be reduced by low-temperature, short-time annealing, which greatly contributes to a reduction in manufacturing cost of the steel sheet.

【0029】また、コア体を800℃以上の温度で焼鈍
することによって、結晶粒径範囲が100〜200μm
となり、焼鈍後の鉄損(W15/50)は材料である鋼
板の鉄損よりも大幅に低くなり、磁気特性が格段に向上
することが確認できた。また、Alを含有(添加)した
鋼板であっても、焼鈍時の雰囲気ガスとして、鋼板中に
含まれるAlと窒化反応を起こさないガスを使用し、8
00℃以上の温度で焼鈍することにより、磁気特性が向
上することが確認できた。なお、本発明にかかる電磁鋼
板から製作したコア体であっても、焼鈍温度が800℃
未満であると磁気特性の向上効果は不十分であり、80
0℃以上で焼鈍することが好ましい。
Further, by annealing the core body at a temperature of 800 ° C. or more, the crystal grain size range is 100 to 200 μm.
, And the iron loss (W15 / 50) after annealing was significantly lower than the iron loss of the steel plate as the material, and it was confirmed that the magnetic properties were significantly improved. Even in the case of a steel sheet containing (added) Al, a gas that does not cause a nitridation reaction with Al contained in the steel sheet is used as an atmosphere gas during annealing.
It was confirmed that the magnetic properties were improved by annealing at a temperature of 00 ° C. or more. In addition, even if it is a core body manufactured from the electromagnetic steel sheet according to the present invention, the annealing temperature is 800 ° C.
If it is less than 80, the effect of improving the magnetic properties is insufficient, and
Annealing at 0 ° C. or higher is preferred.

【0030】図1は表2の実験結果のうち鋼板A1,B
1,C1についての結果をグラフ化した図であり、図中
破線で示す折れ線はAlを含有(添加)した鋼板A1,
C1から製作したコア体の焼鈍時にNを主体とした雰囲
気ガスを使用して焼鈍した結果を示す。図から明らかな
ように、Alを含有した鋼板から製作したコア体を、N
を主体としたガス中で焼鈍した場合は、焼鈍温度が75
0℃を超えると磁気特性の向上効果が減少し、850℃
を超えると逆に劣化するが、Alと窒化反応を起こさな
いガス中で焼鈍した場合は、焼鈍温度800℃以上にお
いて著しい鉄損低減の効果が得られる。
FIG. 1 shows the steel sheets A1 and B among the experimental results in Table 2.
1 and 1 are graphs showing the results for C1, and broken lines shown by broken lines in the figure indicate Al-containing (added) steel sheets A1 and A1.
The result of annealing using an atmosphere gas mainly composed of N at the time of annealing the core body manufactured from C1 is shown. As is clear from the figure, the core body manufactured from the steel sheet containing Al
When annealing in a gas mainly composed of
If the temperature exceeds 0 ° C., the effect of improving the magnetic properties decreases, and the temperature increases to 850 ° C.
However, when annealing is performed in a gas that does not cause a nitriding reaction with Al, a significant effect of reducing iron loss can be obtained at an annealing temperature of 800 ° C. or more.

【0031】[0031]

【発明の効果】固有抵抗を35Ω・m×10-8以上にし
た無方向性電磁鋼板素板を、再結晶焼鈍により結晶粒径
範囲を5〜50μmに調質した無方向性電磁鋼板をモー
タやトランスのコアの材料として使用することにより、
打ち抜き時の加工性や切削時の切削性が向上し、不良品
の発生が低減する。また、この電磁鋼板から製作したコ
ア体を、鋼板の結晶粒径範囲が100〜200μmに成
長する温度で焼鈍することにより、磁気特性がより一層
向上する。
According to the present invention, a non-oriented electrical steel sheet having a specific resistance of 35 Ω · m × 10 −8 or more and a non-oriented electrical steel sheet having a grain size range of 5 to 50 μm refined by recrystallization annealing are used for motor And as a material for transformer cores,
The workability at the time of punching and the workability at the time of cutting are improved, and the occurrence of defective products is reduced. Further, the magnetic properties are further improved by annealing the core body manufactured from the magnetic steel sheet at a temperature at which the crystal grain size of the steel sheet grows to 100 to 200 μm.

【0032】電磁鋼板がAlを含有する鋼板の場合に
は、コア体の焼鈍に用いる雰囲気ガスとして、鋼板中に
含まれるAlと窒化反応を起こさないガスを用いること
により、高温焼鈍における磁気特性の劣化を生じること
なく、磁気特性を向上させることができる。
When the electromagnetic steel sheet is a steel sheet containing Al, a gas that does not cause a nitridation reaction with Al contained in the steel sheet is used as an atmosphere gas used for annealing the core body, so that the magnetic properties during high-temperature annealing can be improved. The magnetic properties can be improved without deterioration.

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

【図1】 コア体の焼鈍温度と鉄損との関係を示す図で
ある。
FIG. 1 is a diagram showing a relationship between an annealing temperature of a core body and iron loss.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 セミプロセス無方向性電磁鋼板を材料と
するコアの製造方法であって、焼鈍時に結晶粒の成長を
妨げない元素を添加し固有抵抗を35Ω・m×10-8
上にした無方向性電磁鋼板素板を、再結晶焼鈍により結
晶粒径範囲を5〜50μmに調質したセミプロセス無方
向性電磁鋼板を積層してコア体を形成した後、鋼板の結
晶粒径範囲が100〜200μmに成長する温度で前記
コア体を焼鈍することを特徴とするコアの製造方法。
1. A method of manufacturing a core using a semi-process non-oriented electrical steel sheet as a material, wherein an element that does not hinder the growth of crystal grains during annealing is added to have a specific resistance of 35 Ω · m × 10 −8 or more. After the non-oriented electrical steel sheet is laminated with a semi-processed non-oriented electrical steel sheet having a grain size range of 5 to 50 μm by recrystallization annealing to form a core body, the grain size range of the steel sheet is A method for manufacturing a core, comprising annealing the core at a temperature at which the core grows to 100 to 200 μm.
【請求項2】 前記コア体の焼鈍温度が800℃以上で
あることを特徴とする請求項1記載のコアの製造方法。
2. The method according to claim 1, wherein an annealing temperature of the core body is 800 ° C. or higher.
【請求項3】 前記材料であるセミプロセス無方向性電
磁鋼板がAlを含有する鋼板の場合に、前記コア体の焼
鈍に用いる雰囲気ガスを、鋼板中に含まれるAlと窒化
反応を起こさないガスとすることを特徴とする請求項
1,2記載のコアの製造方法。
3. When the semi-process non-oriented electrical steel sheet as the material is a steel sheet containing Al, an atmosphere gas used for annealing the core body is a gas that does not cause a nitriding reaction with Al contained in the steel sheet. 3. The method for manufacturing a core according to claim 1, wherein:
【請求項4】 前記雰囲気ガスがHまたはArもしくは
HとArの混合ガスを主成分とするガスである請求項3
記載のコアの製造方法。
4. The gas according to claim 3, wherein the atmosphere gas is H or Ar or a mixed gas of H and Ar.
A method for producing the core described in the above.
【請求項5】 セミプロセス無方向性電磁鋼板を材料と
したモータやトランスのコアであって、焼鈍時に結晶粒
の成長を妨げない元素を添加し固有抵抗を35Ω・m×
10-8以上にした無方向性電磁鋼板素板を、再結晶焼鈍
により結晶粒径範囲を5〜50μmに調質したセミプロ
セス無方向性電磁鋼板を積層してコア体を形成した後、
鋼板の結晶粒径範囲が100〜200μmに成長する温
度で前記コア体を焼鈍して鉄損を低減させたことを特徴
とする低鉄損コア。
5. A motor or transformer core made of a semi-process non-oriented electrical steel sheet, wherein an element that does not hinder the growth of crystal grains during annealing is added to increase the specific resistance to 35 Ω · mx.
10-8 or more non-oriented electrical steel sheet, after forming a core body by laminating a semi-process non-oriented electrical steel sheet tempered to a crystal grain size range of 5 to 50 μm by recrystallization annealing,
A core having a low iron loss, wherein the core is annealed at a temperature at which a crystal grain size of a steel sheet grows to 100 to 200 μm to reduce iron loss.
JP10028867A 1998-02-10 1998-02-10 Core manufacturing method Expired - Fee Related JP2991690B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002220643A (en) * 2001-01-29 2002-08-09 Nippon Steel Corp Non-oriented electromagnetic steel sheet with low iron loss and adequate workability, and manufacturing method therefor
JP2004040057A (en) * 2002-07-08 2004-02-05 Nippon Steel Corp Annealed core, and manufacturing method thereof
JP2004328986A (en) * 2003-01-14 2004-11-18 Toyo Tetsushin Kogyo Kk Stator core for motor and its manufacturing method
JP2018021242A (en) * 2016-08-05 2018-02-08 新日鐵住金株式会社 Nonoriented electromagnetic steel sheet, manufacturing method of nonoriented electromagnetic steel sheet and manufacturing method of motor core
JP2018021241A (en) * 2016-08-05 2018-02-08 新日鐵住金株式会社 Nonoriented electromagnetic steel sheet, manufacturing method of nonoriented electromagnetic steel sheet and manufacturing method of motor core
JP2020025466A (en) * 2019-11-26 2020-02-13 トヨタ自動車株式会社 Rotor core and manufacturing method therefor
JP2021027711A (en) * 2019-08-06 2021-02-22 日本製鉄株式会社 Motor core

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002220643A (en) * 2001-01-29 2002-08-09 Nippon Steel Corp Non-oriented electromagnetic steel sheet with low iron loss and adequate workability, and manufacturing method therefor
JP2004040057A (en) * 2002-07-08 2004-02-05 Nippon Steel Corp Annealed core, and manufacturing method thereof
JP2004328986A (en) * 2003-01-14 2004-11-18 Toyo Tetsushin Kogyo Kk Stator core for motor and its manufacturing method
JP2018021242A (en) * 2016-08-05 2018-02-08 新日鐵住金株式会社 Nonoriented electromagnetic steel sheet, manufacturing method of nonoriented electromagnetic steel sheet and manufacturing method of motor core
JP2018021241A (en) * 2016-08-05 2018-02-08 新日鐵住金株式会社 Nonoriented electromagnetic steel sheet, manufacturing method of nonoriented electromagnetic steel sheet and manufacturing method of motor core
JP2021027711A (en) * 2019-08-06 2021-02-22 日本製鉄株式会社 Motor core
JP2020025466A (en) * 2019-11-26 2020-02-13 トヨタ自動車株式会社 Rotor core and manufacturing method therefor

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