JP2021025061A - 線状溝形成方法および方向性電磁鋼板の製造方法 - Google Patents
線状溝形成方法および方向性電磁鋼板の製造方法 Download PDFInfo
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Abstract
Description
まず、方向性電磁鋼板(以下、単に「鋼板」ともいう)に形成する溝の形状について検討を行った。先述の通り、鋼板に溝を形成した時、透磁率が劣化する。この透磁率の劣化の大きさは、溝の体積に相関するものであるため、形成する溝の体積は極力小さい方が好ましい。したがって、鋼板に形成する溝の形状は、複数の線状溝群を鋼板表面に形成し、隣接する線状溝同士を圧延方向と直交する投影面上で重なるように配置したものよりも、板幅方向に連続的に形成させたもの、すなわち板幅方向に途切れなく形成させたものが好ましいと考えられる。一方、このように形成させた溝による鉄損低減効果は、上記のような小規模の線状溝群を形成し、隣接する線状溝同士を圧延方向と直交する投影面上で重なるように配置したものに比べて小さい。これは、磁区細分化効果は、磁化の不連続部分、すなわち溝の表面積が大きいほど高い効果が得られるためである。
[1]鋼板表面にレジストを形成するレジスト形成工程と、
前記鋼板の圧延方向と交差する方向に走査しながらレーザーを照射することによって前記レーザーが照射された部分のレジストを除去するレーザー走査を、前記鋼板の圧延方向に周期的に行うレーザー照射工程と、
前記レジストが除去された部分の鋼板をエッチングして線状溝を形成するエッチング工程とを有し、
前記レーザー照射工程では、
前記鋼板の板幅方向に並べて設置した2台以上のレーザー照射装置からそれぞれ照射する2本以上のレーザーにより板幅方向に連続的にレジストを除去し、かつ、前記レーザーのスポット径をΦとしたとき、板幅方向に隣接する2台のレーザー照射装置からそれぞれ照射する2本のレーザーのレーザー中心を、レーザーの走査方向と直交する方向に0.05Φ以上0.95Φ以下の範囲でずらして照射する、線状溝形成方法。
[2]前記2本のレーザーにより照射された部分の重なり部のレーザー走査方向の長さを50mm以下とする、[1]に記載の線状溝形成方法。
[3]前記レーザーのスポット径Φが1μm以上100μm以下であり、かつ、前記レーザーの照射エネルギーが1J/m以上30J/m以下である、[1]または[2]に記載の線状溝形成方法。
[4]前記[1]〜[3]のいずれかに記載の線状溝形成方法により、方向性電磁鋼板の表面に線状溝を形成する、方向性電磁鋼板の製造方法。
本発明を適用する方向性電磁鋼板用の鋼素材(スラブ)の基本成分、インヒビター成分および任意添加成分、製造工程について具体的に述べる。
C:0.08質量%以下
Cは、熱延板組織の改善のために添加するが、Cの含有量が0.08質量%を超えると製造工程中に磁気時効の起こらない50質量ppm以下まで脱炭することが困難となるため、C含有量は0.08質量%以下とすることが望ましい。また、Cを含まない鋼素材でも二次再結晶することから、C含有量の下限については特に設けない。
Siは、鋼の電気抵抗を増大させ、鉄損を改善するのに有効な元素であるが、含有量が2.0質量%未満ではその改善効果が十分に発揮されず、一方8.0質量%を超えると加工性、通板性が著しく劣化することに加え、磁束密度も低下する。そのため、Si含有量は2.0〜8.0質量%の範囲とすることが望ましい。
Mnは、熱間か構成を向上させるうえで必要な元素であるが、含有量が0.005質量%未満ではその効果を十分に得ることが出来ず、一方1.0質量%を超えると磁束密度が劣化する。そのため、Mnの含有量は0.005〜1.0質量%の範囲とすることが好ましい。
本発明において、方向性電磁鋼板のスラブの成分組成は、二次再結晶が生じる成分組成であればよい。二次再結晶が生じさせるためにインヒビターを利用する場合、例えばAlN系インヒビターを利用する場合であればAlおよびNを、またMnS・MnSe系インヒビターを利用する場合であれば、MnとSe及び/またはSを適量含有させればよい。もちろん両インヒビターを併用してもよい。この場合における、Al、N、S及びSeの好適含有量はそれぞれ、
Al:0.010〜0.065質量%
N:0.0050〜0.0120質量%
S:0.005〜0.030質量%
Se:0.005〜0.030質量%
である。
Al:0.010質量%以下
N:0.0050質量%以下
S:0.0050質量%以下
Se:0.0050質量%以下
に抑制することが好ましい。
Ni:0.03〜1.50質量%
Sn:0.01〜1.50質量%
Sb:0.005〜1.50質量%
Cu:0.03〜3.0質量%
P:0.03〜0.50質量%
Mo:0.005〜0.10質量%
Cr:0.03〜1.50質量%のなかから選ばれる1種以上
下記に、本発明によって形成する溝の好適な溝寸法を示す。ここで溝寸法とは、溝幅、溝深さに加え、方向性電磁鋼板(鋼帯)の圧延方向に周期的に形成する溝同士の間隔及び、線状溝の延伸方向と板幅方向の成す角を意味する。
線状溝の溝幅は、レジストパターンのレジスト除去部(レーザー照射部)の圧延方向での幅に対応する。また、このレジスト除去部の幅はレジスト除去に用いたレーザーのスポット径に対応する。したがって、溝幅は1μm〜100μm程度となる。
溝形成による鉄損改善効果は、溝端部の表面積、すなわち溝の形成深さが大きい(深い)ほど高い効果が得られる。したがって、板厚に対して4%以上の深さの溝を形成させることが好適である。一方、溝深さを増していくと、当然溝の体積も増加し、透磁率が劣化する傾向となる。さらに、通板時に溝部を起点に破断のリスクがある。以上を踏まえ、溝深さの上限を板厚に対して25%とするのが好適である。
先述の通り、鉄損改善効果は溝端部の表面積が大きいほど向上するため、線状溝の形成間隔は狭いほど良好な結果を得られる。しかしながら、線状溝の形成間隔が狭まるにつれ、鋼板に対する溝の体積分率も増加し透磁率の劣化に加えて、操業時の破断のリスクも高まる。したがって、線状溝の形成間隔を1.5mm〜10mmとするのが好適である。なお、線状溝の形成間隔は、圧延方向における線状溝同士の間隔である。
溝の延伸方向が板幅方向から傾くほど、溝の体積が増加するため、透磁率が劣化する傾向となる。したがって、線状溝の延伸方向と板幅方向の成す角は±30°以内とすることが好ましい。
レーザースポット径は、幅30μmのスリットを用いてスリット法で取得した強度プロファイルの半値全幅を指す。
Claims (4)
- 鋼板表面にレジストを形成するレジスト形成工程と、
前記鋼板の圧延方向と交差する方向に走査しながらレーザーを照射することによって前記レーザーが照射された部分のレジストを除去するレーザー走査を、前記鋼板の圧延方向に周期的に行うレーザー照射工程と、
前記レジストが除去された部分の鋼板をエッチングして線状溝を形成するエッチング工程とを有し、
前記レーザー照射工程では、
前記鋼板の板幅方向に並べて設置した2台以上のレーザー照射装置からそれぞれ照射する2本以上のレーザーにより板幅方向に連続的にレジストを除去し、かつ、前記レーザーのスポット径をΦとしたとき、板幅方向に隣接する2台のレーザー照射装置からそれぞれ照射する2本のレーザーのレーザー中心を、レーザーの走査方向と直交する方向に0.05Φ以上0.95Φ以下の範囲でずらして照射する、線状溝形成方法。 - 前記2本のレーザーにより照射された部分の重なり部のレーザー走査方向の長さを50mm以下とする、請求項1に記載の線状溝形成方法。
- 前記レーザーのスポット径Φが1μm以上100μm以下であり、かつ、前記レーザーの照射エネルギーが1J/m以上30J/m以下である、請求項1または2に記載の線状溝形成方法。
- 請求項1〜3のいずれかに記載の線状溝形成方法により、方向性電磁鋼板の表面に線状溝を形成する、方向性電磁鋼板の製造方法。
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