JP2021535955A - 方向性電磁鋼板およびその磁区微細化方法 - Google Patents
方向性電磁鋼板およびその磁区微細化方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
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- 230000035939 shock Effects 0.000 claims abstract description 123
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
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Abstract
Description
図1および図2に示すように、本発明の一実施例による方向性電磁鋼板10は、電磁鋼板の一面11または両面11、12に、圧延方向(RD方向)と交差する方向に形成された線状のグルーブ20と、電磁鋼板の一面11または両面11、12に、圧延方向と交差する方向に形成された線状の熱衝撃部30とを含む。
また、本発明の一実施例において、グルーブ20および熱衝撃部30に圧延方向(RD方向)に厚みが存在するので、グルーブ20の中心線と熱衝撃部30の中心線を基準として間隔を定義する。さらに、本発明の一実施例において、グルーブ20および熱衝撃部30は実質的に平行であるが、平行でない場合、最も近い位置を間隔と見なす。さらに、複数のグルーブ20および複数の熱衝撃部30が形成された場合、それぞれの間隔(D1、D2、D3)の平均値、つまり、間隔(D1、D2、D3)の総和を全個数で割った値が前述した範囲を満足できる。
この時、レーザのエネルギー密度(Ed)は0.5〜2J/mm2であってもよい。エネルギー密度が小さすぎる場合、適切な深さのグルーブ20が形成されず、鉄損改善効果を得にくい。逆にエネルギー密度が大きすぎる場合にも、深すぎる深さのグルーブ20が形成されて、鉄損改善効果を得にくい。
レーザとしては、1kW〜100kWの出力を有するレーザを用いることができ、Gaussian Mode、Single Mode、Fundamental Gaussian Modeのレーザを用いることができる。TEMoo形態のビームであり、M2値は1.0〜1.2の範囲の値を有することができる。
前述したグルーブ20を形成する段階および熱衝撃部30を形成する段階は、時間の前後に関係なく行われてもよい。具体的には、グルーブ20を形成する段階の後、熱衝撃部30を形成することができる。また、熱衝撃部30を形成する段階の後、グルーブ20を形成することができる。さらに、グルーブ20および熱衝撃部30を同時に形成することも可能である。
冷間圧延した厚さ0.30mmの方向性電磁鋼板を準備した。この電磁鋼板に1.0kWのGaussian modeの連続波レーザを照射して、RD方向と86°の角度のグルーブを形成した。レーザビームの幅(W)は20μmであり、レーザビームの長さ(L)は600μmである。レーザのエネルギー密度は1.5J/mm2、グルーブの深さは12μmであった。
下記表1にまとめたグルーブ間の間隔(D1)でグルーブを形成し、絶縁被膜を形成した。
下記表1にまとめられたグルーブと熱衝撃部との間の間隔(D2)および熱衝撃部間の間隔(D3)で熱衝撃部を形成し、これを表1にまとめた。
11:鋼板の一面、
12:鋼板の他面、
20:グルーブ、
30:熱衝撃部、
40:凝固合金層、
50:絶縁被膜層
Claims (19)
- 電磁鋼板の一面または両面に、圧延方向と交差する方向に形成された線状のグルーブと、
前記電磁鋼板の一面または両面に、前記圧延方向と交差する方向に形成された線状の熱衝撃部とを含み、
前記グルーブおよび前記熱衝撃部は、前記圧延方向に沿って複数個形成され、
前記グルーブと前記熱衝撃部との間の間隔(D2)は、前記グルーブ間の間隔(D1)の0.2〜0.5倍であり、前記熱衝撃部間の間隔(D3)は、前記グルーブ間の間隔(D1)の0.2〜3.0倍である、ことを特徴とする方向性電磁鋼板。 - 前記グルーブ間の間隔(D1)が2〜15mmであり、前記グルーブと前記熱衝撃部との間の間隔(D2)は0.45〜7.5mmであり、前記熱衝撃部間の間隔(D3)は2.5〜25mmである、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブおよび前記熱衝撃部は、前記電磁鋼板の一面に形成される、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブは、前記電磁鋼板の一面に形成され、前記熱衝撃部は、前記電磁鋼板の他面に形成される、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記熱衝撃部間の間隔(D3)は、前記グルーブ間の間隔(D1)の0.2〜0.4倍である、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記熱衝撃部間の間隔(D3)は、前記グルーブ間の間隔(D1)の2〜2.8倍である、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブの深さは、前記電磁鋼板の厚さの3〜5%である、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記熱衝撃部は、前記熱衝撃部が形成されない前記電磁鋼板表面と10〜120のビッカース硬度(Hv)差を有する、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブの下部に形成された凝固合金層を含み、前記凝固合金層は、厚さが0.1μm〜3μmである、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブの上部に形成された絶縁被膜層を含む、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブおよび前記熱衝撃部の長手方向と前記圧延方向とは75〜88°の角度をなす、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記グルーブおよび前記熱衝撃部は、前記電磁鋼板の圧延垂直方向に沿って2個〜10個断続的に形成された、ことを特徴とする請求項1に記載の方向性電磁鋼板。
- 方向性電磁鋼板を準備する段階と、
前記方向性電磁鋼板の一面または両面に、圧延方向と交差する方向にレーザを照射して、線状のグルーブを形成する段階と、
前記方向性電磁鋼板の一面または両面に、前記圧延方向と交差する方向に前記レーザを照射して、線状の熱衝撃部を形成する段階とを含み、
前記グルーブを形成する段階および前記熱衝撃部を形成する段階を複数回行って、前記グルーブおよび前記熱衝撃部を前記圧延方向に沿って複数個形成し、
前記グルーブと前記熱衝撃部との間の間隔(D2)は、複数の前記グルーブ間の間隔(D1)の0.2〜0.5倍となり、前記熱衝撃部間の間隔(D3)は、前記グルーブ間の間隔(D1)の0.2〜3.0倍となるように形成する、ことを特徴とする方向性電磁鋼板の磁区微細化方法。 - 前記グルーブを形成する段階における前記レーザのエネルギー密度は0.5〜2J/mm2であり、前記熱衝撃部を形成する段階における前記レーザのエネルギー密度は0.02〜0.2J/mm2である、ことを特徴とする請求項13に記載の方向性電磁鋼板の磁区微細化方法。
- 前記グルーブを形成する段階において、前記レーザの前記方向性電磁鋼板の圧延垂直方向のビーム長さが50〜750μmであり、前記レーザの前記方向性電磁鋼板の圧延方向のビーム幅が10〜30μmである、ことを特徴とする請求項13に記載の方向性電磁鋼板の磁区微細化方法。
- 前記熱衝撃部を形成する段階において、前記レーザの前記方向性電磁鋼板の圧延垂直方向のビーム長さが1,000〜15,000μmであり、前記レーザの前記方向性電磁鋼板の圧延方向のビーム幅が80〜300μmである、ことを特徴とする請求項13に記載の方向性電磁鋼板の磁区微細化方法。
- 前記方向性電磁鋼板の表面に絶縁被膜層を形成する段階をさらに含む、ことを特徴とする請求項13に記載の方向性電磁鋼板の磁区微細化方法。
- 前記グルーブを形成する段階の後、前記方向性電磁鋼板の表面に前記絶縁被膜層を形成する段階を行う、ことを特徴とする請求項17に記載の方向性電磁鋼板の磁区微細化方法。
- 前記方向性電磁鋼板の表面に前記絶縁被膜層を形成する段階の後、前記熱衝撃部を形成する段階を行う、ことを特徴とする請求項18に記載の方向性電磁鋼板の磁区微細化方法。
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