JP2018508645A - 方向性電磁鋼板およびその製造方法 - Google Patents
方向性電磁鋼板およびその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 38
- 229910000976 Electrical steel Inorganic materials 0.000 title claims description 27
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims description 138
- 239000010959 steel Substances 0.000 claims description 138
- 239000010410 layer Substances 0.000 claims description 72
- 229910052755 nonmetal Inorganic materials 0.000 claims description 63
- 150000004706 metal oxides Chemical class 0.000 claims description 51
- 238000000137 annealing Methods 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 38
- 238000001953 recrystallisation Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 17
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 16
- 230000001678 irradiating effect Effects 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910020068 MgAl Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 45
- 229910052742 iron Inorganic materials 0.000 description 21
- 230000005381 magnetic domain Effects 0.000 description 20
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 238000005097 cold rolling Methods 0.000 description 14
- 230000006872 improvement Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 8
- 239000010960 cold rolled steel Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052839 forsterite Inorganic materials 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910001463 metal phosphate Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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Abstract
Description
(ここで、Pはレーザの出力(W)、Vはレーザの走査速度(m/s)である。)
前記グルーブを形成する段階において、前記グルーブの幅(Wb)と深さ(Db)との比が3.2:1〜2:1となるように前記グルーブを形成するものであってもよい。
(ここで、Pはレーザの出力(W)、Vはレーザの走査速度(m/s)である。)
ここで、レーザのエネルギー密度を式1のように限定した理由は、0.010W−1m/s未満の場合には、レーザによるグルーブ形成時、グルーブに熱影響が増加することによって鉄損特性が低下する問題があり、0.080W−1m/s超過の場合、表面に形成されるグルーブが熱処理後の鉄損を改善する程度の深さを形成できない問題が生じ得るからである。
そして、電磁鋼板の厚さを0.3mm、0.27mm、そして0.23mmに対して追加的に同一条件で実験した結果、冷間圧延後の鋼板(A)に形成されたグルーブの幅(Wa)と深さ(Da)との比は5:1であり、レーザ照射条件を変化して、深さがさらに深くなっても最大3.5:1程度であることを確認した。
Claims (31)
- 表面にグルーブが形成された方向性電磁鋼板において、
前記グルーブは、前記電磁鋼板の表面に非金属酸化物層が被覆された状態で形成され、
前記グルーブは、グルーブの幅(Wb)と深さ(Db)との比が3.4:1〜1.5:1と幅が狭くて深さが深く形成されたことを含む、方向性電磁鋼板。 - 前記グルーブは、グルーブの幅(Wb)と深さ(Db)との比が3.2:1〜2:1と幅が狭くて深さが深く形成されたことを含む、請求項1に記載の方向性電磁鋼板。
- 前記グルーブ底の深さが最大となる地点における曲率半径(RBb)と、前記グルーブの深さが最大となる地点からグルーブの深さ(Db)の1/4地点までのグルーブ表面における曲率半径(RSb)の垂直接線部を相互連結した接線部の変曲点(Xb)は、前記グルーブの深さの1/2地点(1/2Da)より下部に形成された、請求項1に記載の方向性電磁鋼板。
- 前記グルーブ底の深さが最大となる地点における曲率半径(RBb)と、前記グルーブの深さが最大となる地点からグルーブの深さ(Db)の1/4地点までのグルーブ表面における曲率半径(RSb)の垂直接線部を相互連結した接線部の変曲点(Xb)は、前記グルーブの深さの1/2地点(1/2Da)より下部に形成された、請求項2に記載の方向性電磁鋼板。
- 前記グルーブは、前記グルーブの深さが最大となる地点における曲率半径(RBb)が0.2μm〜100μmである、請求項1〜4のいずれか1項に記載の方向性電磁鋼板。
- 前記非金属酸化物層は、Mg2SiO4、MgAl2O4、MnO、MnO2、またはMn2SiO4のうちのいずれか1つであるか、またはいずれか1つ以上が複合的に形成されたものである、請求項5に記載の方向性電磁鋼板。
- 前記非金属酸化物層は、前記電磁鋼板の表面に1〜20μmの厚さに形成されたものである、請求項6に記載の方向性電磁鋼板。
- 前記非金属酸化物層は、前記電磁鋼板の表面に1〜5μmの厚さに形成されたものである、請求項6に記載の方向性電磁鋼板。
- 前記グルーブの深さが最大となる地点からグルーブの深さ(D)の1/4地点までのグルーブ表面における曲率半径(Rs)が4μm〜130μmである、請求項6に記載の方向性電磁鋼板。
- 前記グルーブの下部には素地鋼板の再結晶が存在する、請求項9に記載の方向性電磁鋼板。
- 前記グルーブの深さ(Db)は、電磁鋼板の厚さの3%〜8%である、請求項10に記載の方向性電磁鋼板。
- 前記グルーブの上部幅(Wb)は、10μm〜50μmである、請求項11に記載の方向性電磁鋼板。
- 前記グルーブは、線状に形成され、前記線状のグルーブは、電磁鋼板の圧延方向に対して82°〜98°である(90°を含まない)、請求項12に記載の方向性電磁鋼板。
- 冷間圧延した電磁鋼板を、脱炭焼鈍した後に、焼鈍分離剤を塗布し、高温焼鈍によって二次再結晶を形成して、前記電磁鋼板の表面に非金属酸化物層を形成する段階と、
前記非金属酸化物層が形成された電磁鋼板の表面にグルーブを形成するが、
前記グルーブの幅(Wb)と深さ(Db)との比が3.4:1〜1.5:1と幅が狭くて深さが深く形成されるようにグルーブを形成する段階
とを含む、方向性電磁鋼板の製造方法。 - 前記グルーブを形成する段階は、
ガウシアン(Gaussian)エネルギー分布を有し、TEM00モードであり、ビーム品質ファクター(factor)のM2が1.0〜1.1の連続波レーザを用いてグルーブを形成する、請求項14に記載の方向性電磁鋼板の製造方法。 - 前記連続波レーザは、波長が1.06〜1.08の範囲であり、出力は0.5〜5kWであり、エネルギー密度は0.5〜2.0J/mm2である、請求項15に記載の方向性電磁鋼板の製造方法。
- 前記連続波レーザは、Nd:YAGレーザまたはファイバーレーザである、請求項16に記載の方向性電磁鋼板の製造方法。
- 前記レーザは、下記式1の範囲のエネルギー密度を有する、請求項15に記載の方向性電磁鋼板の製造方法。
0.010W−1m/s≦P−1×V≦0.080W−1m/s−−−−(1)
(ここで、Pはレーザの出力(W)、Vはレーザの走査速度(m/s)である。) - 前記グルーブを形成する段階において、前記グルーブの幅(Wb)と深さ(Db)との比が3.2:1〜2:1となるように前記グルーブを形成する、請求項14〜18のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記グルーブを形成する段階において、
前記グルーブ底の深さが最大となる地点における曲率半径(RBb)と、前記グルーブの深さが最大となる地点からグルーブの深さ(Db)の1/4地点までのグルーブ表面における曲率半径(RSb)の垂直接線部を相互連結した接線部の変曲点(Xb)が前記グルーブの深さの1/2地点(1/2Da)より下部に形成されるように前記グルーブを形成する、請求項19に記載の方向性電磁鋼板の製造方法。 - 前記グルーブを形成する段階において、
前記グルーブの深さが最大となる地点における曲率半径(RBb)が0.2μm〜100μmとなるように前記グルーブを形成する、請求項20に記載の方向性電磁鋼板の製造方法。 - 前記非金属酸化物層は、Mg2SiO4、MgAl2O4、MnO、MnO2、またはMn2SiO4のうちのいずれか1つであるか、またはいずれか1つ以上が複合的に形成されたものである、請求項21に記載の方向性電磁鋼板の製造方法。
- 前記非金属酸化物層は、1〜20μmの厚さに形成する、請求項22に記載の方向性電磁鋼板の製造方法。
- 前記非金属酸化物層は、1〜5μmの厚さに形成する、請求項22に記載の方向性電磁鋼板の製造方法。
- 前記非金属酸化物層の上部に絶縁コーティング層をさらに形成させる、請求項22に記載の方向性電磁鋼板の製造方法。
- 前記グルーブが形成された前記電磁鋼板を熱処理して、前記グルーブの下部に素地鋼板の再結晶をさらに形成させる、請求項22に記載の方向性電磁鋼板の製造方法。
- 前記再結晶を形成させる方法は、絶縁コーティング層を形成する熱処理または応力緩和焼鈍のうちのいずれか1つである、請求項26に記載の方向性電磁鋼板の製造方法。
- 前記グルーブを形成する段階で形成されるグルーブの深さ(Db)は、電磁鋼板の厚さの3%〜8%である、請求項22に記載の方向性電磁鋼板の製造方法。
- 前記グルーブを形成する段階で形成されるグルーブの上部幅(Wb)は、10μm〜50μmである、請求項28に記載の方向性電磁鋼板の製造方法。
- 前記グルーブを形成する段階で形成される線状のグルーブと、電磁鋼板の圧延方向とのなす角度は、82°〜98°である(90°を含まない)、請求項29に記載の方向性電磁鋼板の製造方法。
- 前記グルーブを形成する段階において、鋼板の幅方向に10μm〜30μm、鋼板の圧延方向に5μm〜20μmのレーザビームを鋼板に照射して一次グルーブを形成した後、前記一次グルーブ上に鋼板の幅方向に35μm〜80μm、鋼板の圧延方向に25μm〜50μmのレーザビームを照射して二次グルーブをさらに形成する、請求項20〜30のいずれか1項に記載の方向性電磁鋼板の製造方法。
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