JPS6383227A - Improvement of iron loss value of electrical steel sheet - Google Patents
Improvement of iron loss value of electrical steel sheetInfo
- Publication number
- JPS6383227A JPS6383227A JP61226271A JP22627186A JPS6383227A JP S6383227 A JPS6383227 A JP S6383227A JP 61226271 A JP61226271 A JP 61226271A JP 22627186 A JP22627186 A JP 22627186A JP S6383227 A JPS6383227 A JP S6383227A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- laser
- iron loss
- lenses
- beams
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 29
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 6
- 230000006872 improvement Effects 0.000 title description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000007796 conventional method Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 238000009413 insulation Methods 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000005381 magnetic domain Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電磁銅板の鉄損値の改善方法に関するもので
あり、さらに詳しく述べるならば、電磁鋼板の表面にレ
ーザー光を照射することにより磁区構造に変化を生じせ
しめることにより鉄損値を向上せしめる方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for improving the iron loss value of an electromagnetic copper plate, and more specifically, by irradiating the surface of an electromagnetic steel plate with laser light. This invention relates to a method of improving iron loss value by causing changes in magnetic domain structure.
電磁鋼板の表面にレーザー光を照射することにより磁区
構造に変化を生じせしめることにより鉄損値を向上せし
める技術は、本出願人の特公昭５７−２２５２号をもっ
て唱矢とし、その後多数の技術が特許として公表されて
いる。レーザー光照射により鋼板に痕跡が残るか否かの
観点からレーザー光照射技術を分類することができる。The technology of improving the iron loss value by changing the magnetic domain structure by irradiating the surface of an electrical steel sheet with laser light was pioneered by the present applicant in Japanese Patent Publication No. 57-2252, and since then many technologies have been developed. Published as a patent. Laser light irradiation techniques can be classified from the viewpoint of whether or not traces are left on the steel plate by laser light irradiation.
痕跡を残すことが前提になっている技術には、例えば特
公昭５８−５０２９７号、特公昭５Ｂ−５０２９８号で
ある。一方、特開昭５９−３３８０２号は連続発振レー
ザー光を照射に用いると絶縁被膜に損傷を与えることな
く磁区の細分化による鉄損値低下が可能であることを開
示している。よって、特開昭５９−３３８０２号は鋼板
に痕跡を残さない技術に分類される。Examples of techniques based on leaving traces include Japanese Patent Publication No. 58-50297 and Japanese Patent Publication No. 5B-50298. On the other hand, JP-A No. 59-33802 discloses that when continuous wave laser light is used for irradiation, it is possible to reduce the iron loss value by subdividing the magnetic domains without damaging the insulating coating. Therefore, JP-A-59-33802 is classified as a technique that does not leave traces on the steel plate.
特開昭５９−３３８０２号に開示されたレーザー光照射
条件で際立ったところは次の点にあると認められる。走
査線が鋼板の移動方向（圧延方向）に対してほぼ直角に
なり、隣合った走査線間の間隔が適当になるような条件
で照射時間制御により最大の磁区細分化を行なうような
条件を一般的条件とする。具体的条件としては、（イ）
ｗｊ板垂直面でのエネルギー密度の制御、（ロ）レーザ
ービームの断面形状の選定、（ハ）単位面積当たりのレ
ーザーパワー制御卸についての説明がなされている。It is recognized that the following points are notable about the laser beam irradiation conditions disclosed in JP-A-59-33802. The scanning lines are almost perpendicular to the moving direction (rolling direction) of the steel plate, and the spacing between adjacent scanning lines is appropriate, and the irradiation time is controlled to achieve maximum magnetic domain refining. General conditions. The specific conditions are (a)
Control of the energy density on the vertical plane of the WJ plate, (b) selection of the cross-sectional shape of the laser beam, and (c) control of the laser power per unit area are explained.
（イ）の制御は鋼板内部への熱の拡散を制御することに
より磁区細分化の効果を生じるものである。Control (a) produces the effect of magnetic domain refining by controlling the diffusion of heat into the steel sheet.
（イ）の制御対象であるエネルギー密度を決定する要因
は、レーザーパワーＰ、レーザービームが鋼板の幅Ｗを
横切るに必要とする走査時間ｔＳＣａｌｌｓ鋼板の幅Ｗ
、ある特定位置にスポットが滞在する時間Δｔ、銅板の
熱拡散率ｋにより決定される。The factors that determine the energy density to be controlled in (b) are the laser power P, the scanning time tSCalls required for the laser beam to cross the width W of the steel plate, and the width W of the steel plate.
, the time Δt that the spot stays at a specific position, and the thermal diffusivity k of the copper plate.
これらの要因のうち実際上制御の対象となる要因はレー
ザーパワーＰであり、また２０〜６００ＷのＮｄ−ＹＡ
Ｇレーザーを高速走査することが良好な結果を与える。Among these factors, the factor that is actually subject to control is the laser power P, and the 20 to 600 W Nd-YA
Fast scanning of the G laser gives good results.
またエネルギー密度が高すぎると絶縁被膜の損傷が起る
。これを避けるためにはレーザーパワー、走査時間、滞
在時間の選定が必要である。（ロ）のレーザービームの
断面形状の選定は、絶縁被膜の損傷を生じないである特
定位置にスポットが滞在する時間Δｔを長くし、磁区細
分化効果を高めるものである。具体的には、走査方向に
長軸を有する楕円形スポットをシリンドリカルレンズで
形成する。（ハ）も絶縁膜の損傷を生じさせないために
上限を制御する要因である。Also, if the energy density is too high, damage to the insulation coating will occur. To avoid this, it is necessary to select laser power, scanning time, and residence time. The selection of the cross-sectional shape of the laser beam (b) increases the time Δt during which the spot stays at a specific position without causing damage to the insulating film, thereby enhancing the magnetic domain refining effect. Specifically, an elliptical spot having a long axis in the scanning direction is formed using a cylindrical lens. (C) is also a factor for controlling the upper limit in order to prevent damage to the insulating film.
本発明者は、連続発振レーザーにより電磁鋼板の鉄損値
を改善する方法において、−層の改善の可能性を目的と
して実験を行なった。The present inventor conducted an experiment with the aim of improving the -layer in a method of improving the iron loss value of an electrical steel sheet using a continuous wave laser.
その過程で、絶縁被膜の非損傷性を調べるため特開昭５
９−３３８０２号に記載された絶縁破壊電圧を測定する
方法の他に、塩酸噴霧試験法を行なって絶縁被膜がレー
ザー照射により損傷を受けたが否かを検討した。その結
果、破壊電圧測定法では非照射絶縁被膜と区別できない
照射絶縁被膜の一部が塩酸噴霧により発錆し、被膜が損
傷していることが認められた。In the process, in order to investigate the non-damage properties of the insulating coating,
In addition to the method of measuring dielectric breakdown voltage described in No. 9-33802, a hydrochloric acid spray test method was conducted to examine whether the insulating coating was damaged by laser irradiation. As a result, it was found that a portion of the irradiated insulating film, which cannot be distinguished from the non-irradiated insulating film by the breakdown voltage measurement method, was rusted by the hydrochloric acid spray and the film was damaged.
さらに、特開昭５９〜３３８０２号の第３図に記載され
たようにレーザーエネルギー密度が高くなると、鉄損は
低下するが絶縁被膜が損傷するという関係があり、この
特開昭５９−３３８０２号に開示されたより更に鉄損を
低下しようとすると、ここに具体的に説明されたレーザ
ーパワーＰ、レーザービームが鋼板の幅Ｗを横切るに必
要とする走査時間ｔ ５ＣＩＩ１１、鋼板の幅Ｗ、ある
特定位置にスポットが滞在する時間Δｔ、鋼板の熱拡散
率にの調節とは別の手法を採用する必要があることが認
められた。Furthermore, as shown in FIG. 3 of JP-A No. 59-33802, when the laser energy density increases, the iron loss decreases but the insulation coating is damaged. In order to further reduce the iron loss than that disclosed in , the laser power P, the scanning time t required for the laser beam to traverse the width W of the steel plate, t5CII11, the width W of the steel plate, and a certain It was recognized that it was necessary to adopt a method different from adjusting the time Δt that a spot stays in a position and the thermal diffusivity of the steel plate.
Ｃ問題点を解決するための手段〕
本発明は、フラントフィールドレンズにより集光したＹ
ＡＧレーザ光を下記条件（ａ）、（ｂ）、（ｃ）および
関係式（ｄ）を満足するように、がつ円形のスポットと
して鋼板に照射して極めて低い鉄損値を得ることを特徴
とする。Means for Solving Problem C] The present invention provides Y light condensed by a flank field lens.
The feature is that an extremely low iron loss value can be obtained by irradiating AG laser light onto a steel plate as a circular spot so as to satisfy the following conditions (a), (b), (c) and relational expression (d). shall be.
（ａ） レーザーハ’７− Ｐ （Ｗ）
４０≦Ｐ ≦８０（ｂ） レーサービー４径ｄ（ａ
ｍ） ０．０４≦ｄ ”０．１（ｃ） レーザ
ー走査スピードＶ。(a) Laserha'7-P (W)
40≦P≦80(b) Racerby 4 diameter d(a
m) 0.04≦d”0.1 (c) Laser scanning speed V.
（ｗ／５ｅｃ） ４０００≦Ｖ、≦６０００（ｄ）
関係式：
％式％
但し、η１は電磁鋼板表面に形成された絶縁被膜の透過
率である。(w/5ec) 4000≦V, ≦6000(d)
Relational formula: % formula % However, η1 is the transmittance of the insulating film formed on the surface of the electromagnetic steel sheet.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
上記した関係式４Ｐ７７＋ ／π（ｄ’ ・Ｖｓ）”
”はエネルギー密度を表わす
４Ｐ／π（ｄ３ ・Ｖ、、）Ｉ／２・・・川（１）の
項を含む。（１）式は
Ｐ／（（π／４）・ｄ２） ・・・・・・（２）と（
ｄ／Ｖ５）”” ・・・・・・（３）の積である。（
２）式は円形スポット面積当たりのレーザーパワーを表
わし、また（３）式は直径（ｄ）のそのレーザースポッ
トが鋼板に滞在する時間の因子である。（２）式と（３
）式の積により鋼板への投入熱量が定まる。The above relational expression 4P77+ /π(d'・Vs)"
” represents the energy density, 4P/π(d3 ・V, ,) I/2... Contains the term of river (1).Equation (1) is P/((π/4)・d2)... ...(2) and (
d/V5)""...It is the product of (3). (
Equation 2) represents the laser power per circular spot area, and equation (3) is a factor for the time that the laser spot of diameter (d) stays on the steel plate. Equation (2) and (3
) The amount of heat input to the steel plate is determined by the product of the equation.
η１は絶縁皮膜のＹＡＧレーザー波（波長１．０６μｍ
）に対する透過率である。η１は、あらかじめ透過率の
判明しているガラス上に皮膜を塗布し、レーザー光を照
射した時、ガラスの反対側に設置したパワーメータにて
透過レーザーパワーを測定することにより、得られる。η1 is the YAG laser wave of the insulation film (wavelength 1.06 μm
). η1 can be obtained by applying a film on glass whose transmittance is known in advance, irradiating it with laser light, and measuring the transmitted laser power with a power meter installed on the opposite side of the glass.
η１は皮膜中の酸素量の多ケにより変化するが、鉄損効
果を十分得る条件として十分な地鉄への投入熱量を得る
ためには、η１はすくなくとも０．８以上必要である。η1 changes depending on the amount of oxygen in the film, but in order to obtain a sufficient amount of heat input to the base iron as a condition for obtaining a sufficient iron loss effect, η1 must be at least 0.8 or more.
よって絶縁被膜の状態によって適切な投入熱量を得るこ
とが重要である。なお、絶縁被膜の状態を変える最大の
要因は原板の鉄損を良好にすべく為されている脱炭焼鈍
雰囲気制御、絶縁被膜の組成調整であり、これらは重要
な技術であるが、絶縁被膜の色調を変化させてレーザー
照射効果を著しく変動させる原因となる。Therefore, it is important to obtain an appropriate amount of heat input depending on the state of the insulation coating. The biggest factors that change the state of the insulation coating are the decarburization annealing atmosphere control and composition adjustment of the insulation coating, which are done to improve the core loss of the original plate.These are important technologies, but the insulation coating This causes the color tone to change and the laser irradiation effect to vary significantly.
ＹＡＧレーザーを用いて、η、 ＝０．８５である電磁
鋼板についてレーザービーム形状および４Ｐ／π（ｄ３
．ＶＳ ）””を変化させて、鉄損（ＷＩＴ／Ｓｏ）お
よび耐性を測定した結果を示す第１図を参照として、さ
らに本発明の説明を行なう。第１図で供試した電磁鋼板
は厚さ０．２３ｍｍであり、磁気特性が鉄損Ｗ＋７１５
０ ＝０．９１３ Ｗ／ Ｋ ｇ 、磁束密度ＢＩＯ＝
１．９３４７であり、絶縁被膜はアルミナとコロイダル
シリカを主体とするものである。Using a YAG laser, the laser beam shape and 4P/π (d3
．． The present invention will be further explained with reference to FIG. 1, which shows the results of measuring iron loss (WIT/So) and resistance by varying VS)''. The electromagnetic steel sheet used in Figure 1 has a thickness of 0.23 mm, and its magnetic properties are iron loss W + 715.
0 = 0.913 W/K g, magnetic flux density BIO=
1.9347, and the insulating coating is mainly composed of alumina and colloidal silica.
第１図の下側横軸は、レーザーパワーＰ、レーザービー
ム径ｄ３レーザー走査スピード■３を特許請求の範囲の
値内で変化させて与えたエネルギー密度４Ｐ／π（ｄ３
、Ｖ、）Ｉ／２を表わす。上側横軸は特開昭５９−３
３８０２号に示されたエネルギー密度Ｅ／Ａｖである。The lower horizontal axis in Fig. 1 is the energy density 4P/π (d3
, V, ) represents I/2. The upper horizontal axis is JP-A-59-3
This is the energy density E/Av shown in No. 3802.
レーザービームスポットの幾何学形状を、（イ）円形、
直径ｄ＞Ｏ，１ｍｎ（上限１０璽園）、（ロ）円形、直
径ｄ ＝０．０４〜０．１璽−１（ハ）楕円、長径ａ−
２０ｍｍ、短径ｂ ＝ ０．２ ＊ｕの三種類で変化さ
せた。なお惰肯≠＊＃零≠、楕円についてはａｂ＝ｄ２
として横軸のエネルギー密度を計算した。The geometric shape of the laser beam spot is (a) circular;
Diameter d > O, 1 mm (upper limit 10 mm), (b) circular, diameter d = 0.04 to 0.1 mm -1 (c) ellipse, major axis a-
It was varied in three types: 20 mm, minor axis b = 0.2 *u. In addition, inertia≠*#zero≠, ab=d2 for the ellipse
The energy density on the horizontal axis was calculated as .
−に記諸条件でレーザーを測定した後鉄損（ＷＩ、／、
。）を通常の方法で測定し、また被膜損傷の有無を５％
ＩＩｃＩ溶液に５時間噴霧し、その後２４時間放置して
発錆の有無により評価した。− Iron loss (WI, /, after measuring the laser under the conditions described in
. ) is measured in the usual way, and the presence or absence of film damage is measured at 5%.
It was sprayed onto the IIcI solution for 5 hours, then left to stand for 24 hours, and evaluated based on the presence or absence of rust.
第１図から明らかなように、ｄ＝０．０４〜Ｑ、ｌ ｍ
ｍの細径円径スポットを高いエネルギー密度で照射する
と鉄損が著しく低下しまた絶縁被膜の損傷が起るエネル
ギー密度が高い値にずれる。これに対して楕円形スポッ
トで照射すると、鉄損低下が顕著でなく、かつ低いエネ
ルギー密度で絶縁被膜の損傷が起る。ｄ ＞ ０．１１
１の大径円形スポットは細径円形スポットと楕円形スポ
ットの中間的挙動を示す。As is clear from Fig. 1, d=0.04~Q, l m
When a spot with a small circular diameter of m is irradiated at a high energy density, iron loss is significantly reduced, and the energy density at which damage to the insulating film occurs shifts to a high value. On the other hand, when irradiating with an elliptical spot, the reduction in core loss is not significant and damage to the insulating film occurs at low energy density. d > 0.11
The large-diameter circular spot No. 1 exhibits intermediate behavior between the small-diameter circular spot and the elliptical spot.
以下、本発明における数値限定理由を説明する。The reason for numerical limitation in the present invention will be explained below.
ｄ ＝０．０４〜０．１ ＋＋ｎの円形スポットを用い
ることにしたのは、第１図を参照して説明したように絶
縁被膜の損傷を招かずに、エネルギー密度を高めて著し
く低い鉄損を達成することができるからである。レーザ
ービームの径ｄはビームエキスパングーで調節する。レ
ーザービームのスポットの円形形状はフラットフィール
ドレンズで得られる。The reason why we decided to use a circular spot with d = 0.04 to 0.1 ++n is that, as explained with reference to Fig. 1, we can increase energy density and significantly lower core loss without causing damage to the insulating film. This is because it is possible to achieve The diameter d of the laser beam is adjusted with a beam expander. The circular shape of the laser beam spot is obtained with a flat field lens.
４Ｐη１／π （ｄ’ ・Ｖｓ ）””を４０以」二
としたのは、これ未満の投入熱量であると鉄損の改善効
果が低く、原板（レーザー照射前の一方向性電磁銅板）
に対する改善が１０％を越えないからである。一方４Ｐ
η＋ ／ ｎ （ｄ” Ｖｓ ） ””を９０未満とし
たのは、これを越えると絶縁被膜の損傷が起るからであ
る。なお、投入熱量が９０を越えても、絶縁被膜の破壊
電圧が急激に低下するという問題はないが、レーザー照
射後の鋼板が需要家もしくは製造者の工場で在庫された
ときに錆が発生する問題が起り得る。こうなると外観不
良の問題に留らず、耐電圧不良等の重大な品質上の欠陥
を生じる。The reason why 4Pη1/π (d' ・Vs) was set to 40 or more is because if the input heat amount is less than this, the iron loss improvement effect will be low, and the original plate (unidirectional electromagnetic copper plate before laser irradiation)
This is because the improvement over 10% does not exceed 10%. On the other hand, 4P
The reason why η+ / n (d"Vs) "" is set to be less than 90 is because if this value is exceeded, the insulation coating will be damaged. Furthermore, even if the amount of heat input exceeds 90, the breakdown voltage of the insulation coating will be Although there is no problem of sudden deterioration, rust may occur when the steel plate after laser irradiation is stored at a customer's or manufacturer's factory.This will not only cause poor appearance, but also lead to poor durability. This will result in serious quality defects such as voltage failure.
レーザーパワーＰとレーザー走査スピードｖｓは現在実
現可能なレーザーパワーの中で低めの範囲と、高速走査
スピードを組み合わせるごとによって絶縁被膜損傷傾向
を抑制するように定めた。Laser power P and laser scanning speed vs. were determined to suppress the tendency to damage the insulating coating by combining a lower range of laser power that is currently achievable and a higher scanning speed.
低いパワーのレーザーを高速で走査するとエネルギー投
入量が少なくなり、鉄損改善効果が少なくなるという不
都合が起るが、この点はビームのスポット形状を円形に
特定するとともにビーム径を極めて小さい０．０４〜Ｑ
、 ｌ ＊＊に特定することにより、解決した。レーザ
ーパワーＰが４０Ｗを下回りまたレーザー走査スピード
Ｖ、が６ｍ／ｓｅｃを越えると、レーザービーム径ｄを
極端に小さくしなければ、所定の４Ｐη１／π（ｄ３
・ｙ、）ｌ／２を維持することができず、また板金維持
できたにせよ鉄損改善効果は優れない。レーザーパワー
Ｐが８０ｗを越えまたレーザー走査スピード■５が４ｍ
／ｓｅｃを下回ると、逆にレーザービーム径ｄを大きく
しなければならず、絶縁被膜が損傷し易くなりまた鉄損
改善が優れない。レーザーパワーは□通常のパワーメー
ターで測定する。走査スピードはスポットの鋼板との相
対速度の計算値による。Scanning at high speed with a low power laser has the disadvantage that the amount of energy input is small and the iron loss improvement effect is reduced.However, in this case, the beam spot shape is specified to be circular and the beam diameter is extremely small. 04~Q
, l** was solved. When the laser power P is less than 40W and the laser scanning speed V exceeds 6 m/sec, the predetermined 4Pη1/π(d3
・Y, )l/2 could not be maintained, and even if the sheet metal could be maintained, the iron loss improvement effect would not be excellent. Laser power P exceeds 80w and laser scanning speed ■5 is 4m
If it is less than /sec, on the contrary, the laser beam diameter d must be increased, the insulating coating is likely to be damaged, and iron loss improvement is not excellent. Laser power is measured using a regular power meter. The scanning speed is based on the calculated value of the relative speed of the spot to the steel plate.
さらに本発明の実施する好ましい装置について第２図を
参照として説明する。Further, a preferred apparatus for carrying out the present invention will be described with reference to FIG.
ＹＡＧレーザ−１は集光レンズ２で集光され、集光点に
設けられている回転ビームスブリットミラー３ （駆動
モーター４で回転）でレーザーはＡ相及びＢ相に分岐さ
れ、Ａ相、Ｂ相夫々のレーザー光線はコリメートレンズ
５Ａ、５Ｂにて集光される。そしてミラー６Ａ、６Ｂで
下方へ偏光され、ミラー７Ａ、７ＢＴ：Ｆθレンズ９Ａ
、９Ｂの直」二に設けられているガルバーミラー８Ａ、
８Ｂに照射してＦθレンズ９Ａ、９Ｂのレンズ面にスキ
ャニングし、Ｆθレンズ９Ａ、９Ｂにより被処理銅板Ｓ
上に集光照射される。而して被処理鋼板Ｓの巾方向にＡ
、Ｂ２分担して巾方向にはソ゛直角にレーザービーム処
理が行われるものである。The YAG laser 1 is focused by a condensing lens 2, and the laser is split into A-phase and B-phase by a rotating beam split mirror 3 (rotated by a drive motor 4) provided at the condensing point. The respective laser beams are focused by collimating lenses 5A and 5B. The light is then polarized downward by mirrors 6A and 6B, and mirrors 7A and 7BT: Fθ lens 9A
, Galver mirror 8A installed on the second side of 9B,
8B and scans the lens surfaces of Fθ lenses 9A and 9B.
A focused beam of light is irradiated on top. A in the width direction of the steel plate S to be treated
, B2, and laser beam processing is performed at right angles to the width direction.
さらに、本発明の詳細な説明する。Furthermore, the present invention will be explained in detail.
レーザー照射した一方向性電磁鋼板は次のとうりである
。The unidirectional electrical steel sheet irradiated with laser is as follows.
以下余白 表 １ ＹＡＧレーザー照射条件は次のとうりである。Margin below Table 1 The YAG laser irradiation conditions were as follows.
表 ２
備考
＊１−（２）式と同じ
＊２−４ＰηＩ／π（ｄ３ ・Ｖ、）ｌ／２と同じ＊
３−ｄ／走査スピード
第４に示す条件の組み合わせでレーザー照射を行ない、
鉄損改善率を次の式で計算して求めた。Table 2 Notes *1 - Same as formula (2) *2 - Same as 4PηI/π(d3 ・V,)l/2 *
3-d/scanning speed Perform laser irradiation under the combination of conditions shown in the fourth,
The iron loss improvement rate was calculated using the following formula.
表 ３
表３の各試験例では塩酸噴霧試験による発錆はいづれも
認められなかった。Table 3 In each of the test examples in Table 3, no rust was observed in the hydrochloric acid spray test.
比較のために下記条件でレーザー照射を行なった。For comparison, laser irradiation was performed under the following conditions.
表４ 備考：ＸＹはＹＡＧレーザーを意味する。Table 4 Note: XY means YAG laser.
鉄損改善率および塩酸噴霧試験による発錆の有無を次表
に示す。The following table shows the iron loss improvement rate and the presence or absence of rust based on the hydrochloric acid spray test.
以下余白
表５
〔発明の効果〕
本発明によると、従来の連続発振レーザー照射により鉄
損を改善する方法より一層の鉄損の改善と一層良好な絶
縁膜健全性を同時に達成することができた。Margin Table 5 below [Effects of the Invention] According to the present invention, it was possible to simultaneously achieve further improvement in iron loss and better insulating film integrity than in the conventional method of improving iron loss by irradiation with continuous wave laser. .
第１図は÷レモ聴Ｙ Ａ Ｇレーザーの投入熱量と鉄損
の関係を、スポット形状のパラメータとして示すグラフ
、第２図はスキャナ内光路図を示す図面である。
１・・・ＹＡＧレーザ−、２・・・集光レンズ、３・・
・回転ビームスプリントミラー、５・・・コリメートレ
ンズ、 ６，７・・・ミラー、８・・・ガルパ、
９・・・Ｆθレンズ。FIG. 1 is a graph showing the relationship between input heat amount and iron loss of ÷REMO YAG laser as a parameter of spot shape, and FIG. 2 is a drawing showing an optical path diagram in the scanner. 1... YAG laser, 2... Condensing lens, 3...
・Rotating beam splint mirror, 5...Collimating lens, 6,7...Mirror, 8...Galpa,
9...Fθ lens.
Claims (1)
連続発振レーザー光を照射して、鉄損値を改善する方法
において、 フラットフィールドレンズにより集光したＹＡＧの円形
スポットを下記条件（ａ）、（ｂ）、（ｃ）および関係
式（ｄ）を満足するように照射して極めて低い鉄損値を
得ることを特徴とする電磁鋼板の鉄損値改善方法。 （ａ）レーザーパワーＰ（Ｗ） ４０≦Ｐ≦８０（ｂ）
レーザービーム径ｄ（ｍｍ） ０．０４≦ｄ≦０．１（
ｃ）レーザー走査スピードＶ＿ｓ （ｍｍ／ｓｅｃ）４０００≦Ｖ＿ｓ≦６０００（ｄ）関
係式： ４０≦４Ｐη＿１／π（ｄ＾３・Ｖ＿ｓ）＾１＾／＾２
≦９０但し、η＿１は電磁鋼板表面に形成された絶縁被
膜の透過率で１≧η＿１≧０．８である。[Claims] 1. In a method for improving the iron loss value by irradiating the surface of a grain-oriented electrical steel sheet with continuous wave laser light in a direction substantially perpendicular to the rolling direction, the YAG circular shape is focused by a flat field lens. A method for improving an iron loss value of an electrical steel sheet, the method comprising obtaining an extremely low iron loss value by irradiating a spot so as to satisfy the following conditions (a), (b), (c) and relational expression (d). (a) Laser power P (W) 40≦P≦80 (b)
Laser beam diameter d (mm) 0.04≦d≦0.1 (
c) Laser scanning speed V_s (mm/sec) 4000≦V_s≦6000 (d) Relational expression: 40≦4Pη_1/π(d^3・V_s)^1^/^2
≦90 However, η_1 is the transmittance of the insulating film formed on the surface of the electromagnetic steel sheet, and 1≧η_1≧0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61226271A JPH0619112B2 (en) | 1986-09-26 | 1986-09-26 | Method for improving iron loss value of electrical steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61226271A JPH0619112B2 (en) | 1986-09-26 | 1986-09-26 | Method for improving iron loss value of electrical steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6383227A true JPS6383227A (en) | 1988-04-13 |
| JPH0619112B2 JPH0619112B2 (en) | 1994-03-16 |
Family
ID=16842589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61226271A Expired - Lifetime JPH0619112B2 (en) | 1986-09-26 | 1986-09-26 | Method for improving iron loss value of electrical steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619112B2 (en) |
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