JPS60218425A - Method for preventing edge crack and rupture of electrical steel sheet - Google Patents
Method for preventing edge crack and rupture of electrical steel sheetInfo
- Publication number
- JPS60218425A JPS60218425A JP7295684A JP7295684A JPS60218425A JP S60218425 A JPS60218425 A JP S60218425A JP 7295684 A JP7295684 A JP 7295684A JP 7295684 A JP7295684 A JP 7295684A JP S60218425 A JPS60218425 A JP S60218425A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- laser beam
- laser
- cavity
- steel plate
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電磁鋼板の製造工程において適用されるもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is applied to the manufacturing process of electrical steel sheets.
（従来技術）
電磁鋼板を製造する場合、冷間圧延工程における耳割れ
発生率が高く、生産性を低下させる要因となっている。(Prior Art) When producing electrical steel sheets, the incidence of edge cracking during the cold rolling process is high, which is a factor that reduces productivity.
特に高Ｓｉ電磁鋼板においてはその傾向は著しい。従っ
て割れ感受性（耳割れ発生率）ｆ：下げる必要がある。This tendency is particularly remarkable in high-Si electrical steel sheets. Therefore, it is necessary to lower the cracking sensitivity (edge cracking incidence) f.
そこで従来から熱延電磁鋼板の両縁部分を丸刃１（よっ
て連続剪断（トリミング）することによって、後続する
冷延工程での耳割れ発生を防止する方法が、採用されて
いる。しかしこの方法は必然的に加工硬化層を伴うこと
、返り、だれなどの形状不良が発生しやすいことや、工
具の損耗に起因する微小亀裂が生じやすいなどの問題点
があり、そのためトリミング後、さらにこの微小欠陥を
除去する目的で、剪断面をグラインダ等で研磨する方法
などが行われている。Therefore, a method has conventionally been adopted in which both edges of a hot rolled electrical steel sheet are subjected to continuous shearing (trimming) with a round blade 1 to prevent edge cracks from occurring in the subsequent cold rolling process.However, this method There are problems such as inevitably having a work-hardened layer, being prone to shape defects such as warping and drooping, and being prone to microcracks caused by wear and tear on the tool. In order to remove defects, methods such as polishing the sheared surface with a grinder or the like are used.
しかしながらこの方法は機械的な手法であり、微小欠陥
を完全に除去することができない。また丸刃トリミング
およびグライダ−処理等では耳割れ破断を防止すること
は出来ない。However, this method is a mechanical method and cannot completely remove minute defects. Further, round blade trimming, glider treatment, etc. cannot prevent edge cracking and breakage.
一方、電動機、変圧器等の電気機器においては、鉄損の
減少を図る等その特性の向上を図るため電磁鋼板の８１
含有量全増加させることが行われており、従って耳割
れ破断を防止することが、電磁鋼板製造工程における極
めて重要な課題となっている。On the other hand, in electrical equipment such as motors and transformers, 81% of electrical steel sheets are used to improve their properties such as reducing iron loss.
The total content is being increased, and therefore, preventing edge cracking has become an extremely important issue in the manufacturing process of electrical steel sheets.
またレーザービームを用いて鋼板の端縁物をトリミング
する方法は、例えば特開昭５６−１６３８１９号公報に
開示されている。この方法は前記の機械的手法より優れ
ているが、未だ耳割れを完全に防止し得るには至ってい
ない。Further, a method of trimming the edges of a steel plate using a laser beam is disclosed in, for example, Japanese Patent Laid-Open No. 163819/1983. Although this method is superior to the mechanical method described above, it has not yet been able to completely prevent edge cracking.
（発明の目的）
本発明は、このような従来技術の問題点を解決し、Ｓｉ
含有率の高い電磁鋼板の場合においても、冷間圧延時の
耳割れ破断を防止すること全目的とするものである。(Object of the invention) The present invention solves the problems of the prior art and
Even in the case of high content electromagnetic steel sheets, the overall purpose is to prevent edge cracking during cold rolling.
（発明の構成作用）
本発明は、サイドトリミング後の熱延電磁鋼板の側面に
レーザビームを照射加熱することにより電磁鋼板の耳割
れ破断を防止しようとするもので、エネルギー密度を鋼
板端部の加熱・加工のみに使用するよう処理速度に対し
て、レーザノぐワーとビーム径を決定して入熱制御した
レーザビームを、鋼板端部に照射することにより鋼板端
部の延性を向上させようとするものである。(Construction and Effect of the Invention) The present invention attempts to prevent edge cracking of an electrical steel sheet by irradiating and heating the side surface of a hot rolled electrical steel sheet after side trimming. We are trying to improve the ductility of the edge of a steel plate by irradiating the edge of the steel plate with a laser beam whose heat input is controlled by determining the laser nozzle and beam diameter to be used only for heating and processing. It is something to do.
以下図面により本発明を説明する。The present invention will be explained below with reference to the drawings.
第１図は本発明方法の要旨を示す説明図、第２図は本発
明方法の実施例を示す説明図である。図ｊ＋ておいて、
１はレーザ発振器、２はレーザビーム、３はビーム形状
制御部、４はレーザビームを鋼板１０の両側面１ｊ、１
１’に照射するために分割するためのビーム分割部、５
，５１はレーザ照射ヘッドで、第１図に示すようにその
内部に集光レンズ５０を設け、また鋼板の側面’１１
、１１’と対向する面に反射ミラーからなるキャビティ
５１を設けである。FIG. 1 is an explanatory diagram showing the gist of the method of the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of the method of the present invention. Putting it in figure j+,
1 is a laser oscillator, 2 is a laser beam, 3 is a beam shape control unit, 4 is a laser beam that is connected to both sides 1j of the steel plate 10, 1
a beam splitter for splitting to irradiate 1';
, 51 is a laser irradiation head, as shown in FIG.
, 11' is provided with a cavity 51 made of a reflecting mirror.
５２はレーザビーム導入孔、５３は雰囲気ガス人口、５
４はキャビティ冷却水入口、５５は同出口である。52 is a laser beam introduction hole, 53 is an atmospheric gas population, 5
4 is a cavity cooling water inlet, and 55 is an outlet thereof.
なおキャビティ５１の内面は、例えば鏡面仕上げの上に
金メッキを施し、反射率が極めて高１／）状態にしであ
る。また６、６１は鋼板１０の端面を抑え、鋼板の上下
振動全防止するとともに、鋼板端面から外れたレーザビ
ームを反射させ、鋼板端面に導くテーパーロールである
。７は押えロール、８は回転計（速度計）である。The inner surface of the cavity 51 is, for example, mirror-finished and plated with gold, so that the reflectance is extremely high (1/). Further, reference numerals 6 and 61 denote tapered rolls that suppress the end face of the steel plate 10 to completely prevent vertical vibration of the steel plate, and also reflect a laser beam deviated from the end face of the steel plate and guide it to the end face of the steel plate. 7 is a presser roll, and 8 is a tachometer (speed meter).
本発明方法を実施するｊ（は、先ず鋼板１０のライン速
度Ｖを速度計８により測定し、鋼板厚さｄと加熱温度Ｔ
と効率ηとによってレーザ発振器１の出力を制御する。To carry out the method of the present invention, first, the line speed V of the steel plate 10 is measured with a speedometer 8, and the steel plate thickness d and heating temperature T
The output of the laser oscillator 1 is controlled by the efficiency η.
レーザビーム２は長距離伝送において性能全確保するた
めに、ビーム形状制御部３によりビーム径および発散角
を調節した後、ビーム分割部４によって２分割され、レ
ーザ照射ヘラ〜・ド５，５′に供給される。そこでレー
ザビーム２を照射すれば、該ビーム２はレーザ照射ヘッ
ド５内のレンズ５０により集光され、キャビティ５１に
設けたレーザビーム導入孔５２ヲ介して鋼板１０の側面
１１に照射される。同様に鋼板１０のもう一方の端面１
１′には、レーザ照射ヘッド５′からレーザビームが照
射される。In order to ensure full performance in long-distance transmission, the laser beam 2 is divided into two parts by a beam splitting part 4 after adjusting the beam diameter and divergence angle by a beam shape control part 3, and is then split into two parts by a laser irradiation plate 5, 5'. supplied to When the laser beam 2 is irradiated, the beam 2 is focused by a lens 50 in the laser irradiation head 5 and is irradiated onto the side surface 11 of the steel plate 10 through a laser beam introduction hole 52 provided in a cavity 51. Similarly, the other end surface 1 of the steel plate 10
1' is irradiated with a laser beam from a laser irradiation head 5'.
なお鋼板の端面１１ 、１１ ’におけるレーザビーム
径りは、鋼板の振動幅を考慮して、鋼板の板厚ｄよりも
Δｈ大きく設定する。またレーザビーム導入孔５２の大
きさを極力小さくするように、レーザビームの焦点位置
は、できるだけキーヤビテイの極点位置になるように光
学系を設定することが望ましい。キャビティの径と焦点
距離が長くとれる場合は、光学系は不用で平行なレーザ
ビームをキャピテイ導入孔５２に導入するだけでよセ）
。Note that the laser beam diameter at the end surfaces 11 1 and 11 ′ of the steel plate is set to be larger than the thickness d of the steel plate by Δh in consideration of the vibration width of the steel plate. In order to minimize the size of the laser beam introduction hole 52, it is desirable to set the optical system so that the focal position of the laser beam is as close as possible to the extreme point of key vibration. If the diameter and focal length of the cavity can be made long, no optical system is required and only a parallel laser beam can be introduced into the cavity introduction hole 52).
.
レーザビーム２の照射（・【−よって鋼板１０の端面１
１゜１１’は加熱されるが、非溶融状態であり、この状
態ではレーザビーム特にＣＯ２レーザの波長１０．６μ
ｍＫ対しては反射率が非常に高（、従って多くのエネル
ギーが反射し、キャビティ５２側に戻ってくる。そこで
本発明においては、キャビティ５１を設けその表面およ
びチー・く−ロール６．６１のテーパ一部により、この
反射エネルギーを多重反射させ、再び鋼板側面に導入す
るようにしてｐｚるので、鋼板側面における実効吸収率
αｅはほぼに近い値となる。Irradiation of the laser beam 2 (・[-Therefore, the end surface 1 of the steel plate 10
1°11' is heated, but in a non-molten state, and in this state, the laser beam, especially the CO2 laser wavelength 10.6μ, is heated.
For mK, the reflectance is very high (therefore, a lot of energy is reflected and returns to the cavity 52 side. Therefore, in the present invention, the cavity 51 is provided and the surface of the cavity 51 and the The reflected energy is multiple-reflected by the tapered portion and introduced again into the side surface of the steel plate, so that the effective absorption rate αe on the side surface of the steel plate becomes approximately a value.
すなわち
αｅ＝α＋（１−α）α＋（１−α）２α＋・・・・・
・中１但しαは鋼板側面の吸収率である。That is, αe=α+(1-α)α+(1-α)2α+...
- Medium 1 However, α is the absorption rate of the side surface of the steel plate.
本発明は、このよう１（実効吸収率が高くとれるため、
レーザビーム径が大きく、低エネルギー密度状態でも余
裕をもって均一な加熱を行うことができ、その結果鋼板
端面の延性を改善することができるのである。The present invention has the following advantages (1) (because the effective absorption rate can be high,
The laser beam diameter is large and uniform heating can be performed with sufficient margin even in a low energy density state, and as a result, the ductility of the steel plate end face can be improved.
第３図（ａ） （ｂｌ ｆｃ）は本発明方法による鋼板
側面の延性改善状況（歪取り状況）を、従来法と対比し
て示す説明図である。すなわち第３図（ａ）は鋼板の縁
部をロータリーシャーでトリミングした後の状態を示す
ものであるが、側面に微小欠陥（亀裂）１２が脆化部と
ともに存在してい、る。また第３図ｆｂｌは第３図（ａ
）における微小欠陥を、グラインダーにょシ機械的に除
去したものであるが、微小欠陥を完全に除去することは
できずわずかに残っており、それが冷却工程における耳
割れ破断の原因となる。FIG. 3(a) (bl fc) is an explanatory diagram showing the state of ductility improvement (strain relief state) on the side surface of a steel plate by the method of the present invention in comparison with the conventional method. That is, FIG. 3(a) shows the state after the edge of the steel plate has been trimmed by a rotary shear, and micro defects (cracks) 12 are present on the side surface together with the brittle portion. Also, Fig. 3 fbl is shown in Fig. 3 (a
) were mechanically removed using a grinder, but the micro defects could not be completely removed and a small amount remained, which caused edge cracks to break during the cooling process.
これに対し本発明方法によれば、第３図ｆｃｌに示すよ
うに、鋼板側面をレーザビームにより加熱処理されるの
で、該部分に延性部１３が形成され、その結果微小欠陥
がわずかに存在しても、圧延性を高めることができるの
である。なおキャビティ５１内に雰囲気ガス人口５３か
らガスを供給することができるが、この雰囲気ガスはシ
ールドガスの働き全行うとともに、レーザビームの照射
による蒸発物がキャビティ内面に付着することを防止す
る働きも行う。On the other hand, according to the method of the present invention, as shown in FIG. 3fcl, the side surface of the steel plate is heat-treated with a laser beam, so a ductile part 13 is formed in that part, and as a result, there are only a few minute defects. However, it is possible to improve the rolling properties. Note that gas can be supplied into the cavity 51 from an atmospheric gas population 53, and this atmospheric gas not only functions as a shielding gas, but also functions to prevent evaporated matter from adhering to the inner surface of the cavity due to laser beam irradiation. conduct.
（実施例） 次に本発明の実施例を示す。(Example) Next, examples of the present invention will be shown.
出力２ＫＷのＣＯ２レーザを用い、半径３０＋ｍｍの金
メツキ銅製、水冷のキャビティを用い、鋼板端面上でビ
ームスポット径３ＩＩｌ１ｍの条件で、板厚２，３酩、
Ｓｉ含有率３．２％の電磁熱延板に、６ｍ７’−の速度
で照射し、液体窒素で約−１６０Ｃ以下にして圧延した
ところ、レーザ照射しないものには割しカ太き（多く発
生したが、レーザ照射したものは、割れがほとんどなく
発生した割れも非常に小さかった。Using a CO2 laser with an output of 2KW, a water-cooled cavity made of gold-plated copper with a radius of 30+mm, and a beam spot diameter of 3II1m on the end face of a steel plate, the plate thickness is 2.3mm,
When an electromagnetic hot-rolled sheet with a Si content of 3.2% was irradiated at a speed of 6 m7'- and rolled with liquid nitrogen at a temperature of about -160C or less, it was found that the sheet was comparatively thicker than the one that was not irradiated with the laser (a lot of heat was generated). However, those that were irradiated with laser had almost no cracks and the cracks that did occur were very small.
（発明の効果）
以上説明したように本発明においては、鋼板端面での実
効吸収率を高め、効率よく安定したレーザ熱処理を行な
うことができ、冷間圧延での耳割れ破断の発生しない、
熱延鋼板のトリミングプロセスとすることができ、電磁
鋼板製造プロセスの生産性を高めることができる。また
レーザビームの制御も容易になるので、自動化が容易で
ある等その効果は多大である。(Effects of the Invention) As explained above, in the present invention, it is possible to increase the effective absorption rate at the end face of the steel plate, perform efficient and stable laser heat treatment, and prevent edge cracking from occurring during cold rolling.
It can be used as a trimming process for hot-rolled steel sheets, and the productivity of the electrical steel sheet manufacturing process can be improved. Furthermore, since the control of the laser beam becomes easy, automation is easy, and other effects are great.
第１図は本発明方法の要旨を示す説明図、第２図は本発
明方法の実施例を示す説明図、第３図は本発明方法と従
来法とに−おける電磁鋼板の側面の状態を示す説明図で
ある。
１：レーザー発振器 ２：レーザビーム３：ビーム形状
制御部 ４：ビーム分割部５．５’：レーザ照射ヘッド
６．６’：テーパーロール ７：押えロール８：回転計
（速度計）１０：鋼板
１１．１１’： 佃■面 １ｑ Ｊ ｆ＃＆ １ｋｈ−
脇１３：延性部 ５ｏ：集光レンズ
５１：キャビティ ５２：レーザビーム導入孔５３：雰
囲気ガス入口
５４：キャビティ冷却水入口
５５：キャビティ冷却水出口
第７図
竿２図
第 ３ 図Fig. 1 is an explanatory diagram showing the gist of the method of the present invention, Fig. 2 is an explanatory diagram showing an example of the method of the present invention, and Fig. 3 is an explanatory diagram showing the state of the side surface of an electrical steel sheet in the method of the present invention and the conventional method. FIG. 1: Laser oscillator 2: Laser beam 3: Beam shape control unit 4: Beam splitting unit 5.5': Laser irradiation head 6.6': Taper roll 7: Presser roll 8: Rotation meter (speed meter) 10: Steel plate 11 .11': Tsukuda ■ side 1q J f# & 1kh-
Side 13: Ductile part 5o: Condensing lens 51: Cavity 52: Laser beam introduction hole 53: Atmospheric gas inlet 54: Cavity cooling water inlet 55: Cavity cooling water outlet Fig. 7 Pole 2 Fig. 3
Claims (1)
ーザビームを照射加熱することを特徴とする電磁鋼板の
耳割れ破断防止方法。 ２、 サイドトリミング後の熱延電磁鋼板の移動域に１
鋼板端面の上下振動を防止するテーパーロールを設ける
とともに、該ロールに対向してレーザ発振装置および反
射キャビティを設け、レーザ発振装置からのレーザビー
ムをテーパーロールのテーパー面で反射させて鋼板側面
に導き、さらに該側面からの反射ビームを反射キャビテ
ィにより反射させ、鋼板側面に導入し、該側面を加熱す
ることを特徴とする電磁鋼板の耳割れ破断防止方法。[Claims] (1) A method for preventing edge cracking of an electromagnetic steel sheet, which comprises irradiating and heating the side surface of the hot-rolled electromagnetic steel sheet after side trimming with a laser beam. 2. 1 in the moving area of hot rolled electrical steel sheet after side trimming
A tapered roll is provided to prevent vertical vibration of the end face of the steel plate, and a laser oscillation device and a reflection cavity are provided opposite the roll, and the laser beam from the laser oscillation device is reflected by the tapered surface of the tapered roll and guided to the side of the steel plate. A method for preventing edge cracking of an electromagnetic steel sheet, further comprising: reflecting a beam reflected from the side surface by a reflection cavity, introducing the reflected beam onto the side surface of the steel sheet, and heating the side surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072956A JPH0617508B2 (en) | 1984-04-13 | 1984-04-13 | Prevention method of ear crack breakage of electromagnetic steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072956A JPH0617508B2 (en) | 1984-04-13 | 1984-04-13 | Prevention method of ear crack breakage of electromagnetic steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60218425A true JPS60218425A (en) | 1985-11-01 |
| JPH0617508B2 JPH0617508B2 (en) | 1994-03-09 |
Family
ID=13504338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59072956A Expired - Lifetime JPH0617508B2 (en) | 1984-04-13 | 1984-04-13 | Prevention method of ear crack breakage of electromagnetic steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617508B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5078475A (en) * | 1985-12-18 | 1992-01-07 | Canon Kabushiki Kaisha | Flc device with color filter and insulating protection layer with pencil hardness of at least hb |
| WO1998051835A1 (en) * | 1997-05-15 | 1998-11-19 | General Motors Corporation | Method for sliver elimination in shearing aluminum sheet |
| CN104399749A (en) * | 2014-10-28 | 2015-03-11 | 武汉钢铁(集团)公司 | Cold rolling method capable of preventing edge crack and brittle fracture of silicon steel with Si content more than or equal to 3.5 percent |
| WO2016111705A1 (en) * | 2015-01-09 | 2016-07-14 | Illinois Tool Works Inc. | Inline laser-based system and method for thermal treatment of continuous products |
| CN112893466A (en) * | 2021-01-19 | 2021-06-04 | 太原理工大学 | Method for rolling ultrathin strip based on laser energy field assistance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4973357A (en) * | 1972-11-15 | 1974-07-16 | ||
| JPS50137852A (en) * | 1974-04-23 | 1975-11-01 | ||
| JPS52140348A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Ltd | Optical device for photo-processing |
-
1984
- 1984-04-13 JP JP59072956A patent/JPH0617508B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4973357A (en) * | 1972-11-15 | 1974-07-16 | ||
| JPS50137852A (en) * | 1974-04-23 | 1975-11-01 | ||
| JPS52140348A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Ltd | Optical device for photo-processing |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5078475A (en) * | 1985-12-18 | 1992-01-07 | Canon Kabushiki Kaisha | Flc device with color filter and insulating protection layer with pencil hardness of at least hb |
| WO1998051835A1 (en) * | 1997-05-15 | 1998-11-19 | General Motors Corporation | Method for sliver elimination in shearing aluminum sheet |
| CN104399749A (en) * | 2014-10-28 | 2015-03-11 | 武汉钢铁(集团)公司 | Cold rolling method capable of preventing edge crack and brittle fracture of silicon steel with Si content more than or equal to 3.5 percent |
| CN104399749B (en) * | 2014-10-28 | 2016-06-22 | 武汉钢铁(集团)公司 | A kind of can prevent Si >=3.5% silicon steel limit from splitting and the cold rolling process of brittle failure |
| WO2016111705A1 (en) * | 2015-01-09 | 2016-07-14 | Illinois Tool Works Inc. | Inline laser-based system and method for thermal treatment of continuous products |
| CN107636175A (en) * | 2015-01-09 | 2018-01-26 | 伊利诺斯工具制品有限公司 | For being heat-treated the system and method based on laser in column of continuous product |
| CN112893466A (en) * | 2021-01-19 | 2021-06-04 | 太原理工大学 | Method for rolling ultrathin strip based on laser energy field assistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0617508B2 (en) | 1994-03-09 |
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