JPH05263262A - Treatment of electrical insulating film of magnetic steel sheet - Google Patents
Treatment of electrical insulating film of magnetic steel sheetInfo
- Publication number
- JPH05263262A JPH05263262A JP1243092A JP1243092A JPH05263262A JP H05263262 A JPH05263262 A JP H05263262A JP 1243092 A JP1243092 A JP 1243092A JP 1243092 A JP1243092 A JP 1243092A JP H05263262 A JPH05263262 A JP H05263262A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- insulating film
- chromic acid
- relief annealing
- weight
- 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.)
- Pending
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- Manufacturing Of Steel Electrode Plates (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高い占積率を有し、優
れた打抜性と密着性を持ち、歪取り焼鈍後にも優れたす
べり性を発揮する電磁鋼板の電気絶縁皮膜処理方法に関
するものである。FIELD OF THE INVENTION The present invention relates to a method for treating an electrical insulating coating on an electrical steel sheet having a high space factor, excellent punching properties and adhesion, and exhibiting excellent slip properties even after strain relief annealing. It is about.
【０００２】[0002]
【従来の技術】周知の如く、無方向性電磁鋼板をモータ
ー等の鉄芯に使用する場合は、所定の形状に打抜いた後
歪取り焼鈍を行い、所定枚数積み重ねて溶接、かしめ、
または接着等により固定して積鉄芯とされるものであ
る。通常、無方向性電磁鋼板の表面には、電気絶縁皮膜
が形成されている。この絶縁皮膜は絶縁性の他に、耐蝕
性、溶接性、密着性、耐熱性等種々の皮膜特性を必要と
するが、特に占積率、打抜性、密着性が優れていること
が要求される。また、歪取り焼鈍を施した後にも絶縁性
を保持していることが必要であり、近年では歪取り焼鈍
後のすべり性についても優れていることが要求されてい
る。2. Description of the Related Art As is well known, when a non-oriented electrical steel sheet is used for an iron core of a motor or the like, it is punched into a predetermined shape, then strain relief annealing is performed, a predetermined number of sheets are stacked, welded and caulked,
Alternatively, it is fixed by adhesion or the like to form a laminated iron core. Usually, an electrical insulating film is formed on the surface of the non-oriented electrical steel sheet. In addition to insulating properties, this insulating film requires various film properties such as corrosion resistance, weldability, adhesion, and heat resistance, but is particularly required to have excellent space factor, punching property, and adhesion. To be done. In addition, it is necessary to maintain the insulating property even after the stress relief annealing is performed, and in recent years, it is required that the slip property after the stress relief annealing is also excellent.
【０００３】従来、無方向性電磁鋼板の電気絶縁皮膜と
しては、無機系、有機系、無機有機混合系の電気絶縁皮
膜が知られている。しかし、無機系絶縁皮膜は有機系、
無機有機混合系絶縁皮膜に比べて、歪取り焼鈍後のすべ
り性は優れているが、打抜性が劣っている。更に有機系
絶縁皮膜では打抜性、密着性は優れているが、歪取り焼
鈍によって、皮膜が破壊され、歪取り焼鈍後の密着性が
劣悪で使用に耐えない。Conventionally, as an electric insulating film for a non-oriented electrical steel sheet, an inorganic, organic or inorganic-organic mixed type electric insulating film has been known. However, the inorganic insulating film is organic,
Compared with the inorganic-organic mixed type insulation film, the slip property after strain relief annealing is superior, but the punchability is inferior. Furthermore, although the organic insulating film has excellent punchability and adhesion, the film is destroyed by stress relief annealing, and the adhesion after stress relief annealing is poor, and it cannot be used.
【０００４】無機有機混合系絶縁皮膜としては、特公昭
５０−１５０１３号公報に、重クロム酸塩と酢酸ビニ
ル、ブタジエン−スチレン共重合物、アクリル樹脂等の
有機樹脂エマルジョンを主成分とする処理液を用いて絶
縁皮膜を形成することによって、高い占積率、優れた密
着性、打抜性等の皮膜特性を持ち、且つ歪取り焼鈍にも
耐えることができる絶縁皮膜形成方法が提案されてい
る。As the inorganic-organic mixed insulating film, a treatment liquid containing a dichromate and vinyl acetate, a butadiene-styrene copolymer, an acrylic resin or other organic resin emulsion as a main component is disclosed in Japanese Patent Publication No. 50-15013. A method for forming an insulating film has been proposed which has a high space factor, excellent adhesion, punching properties, and other film characteristics and can withstand strain relief annealing by forming an insulating film using ..
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記特公昭
５０−１５０１３号公報に開示された皮膜特性の優れた
電気絶縁皮膜を有する無方向性電磁鋼板は、歪取り焼鈍
後のすべり性に難点があった。上記の如く無方向性電磁
鋼板をモーター等の鉄芯に使用する場合は、所定の形状
に打抜いた後歪取り焼鈍を行い、所定枚数積み重ねて溶
接、かしめまたは接着等により固定して積鉄心とされる
ものであるが、この製造工程は近年自動化が発達し、歪
取り焼鈍後の打抜板は、製造工程中でのガイド上でのす
べり性、打抜板積層時の打抜板間のすべり性を有するこ
とが重要である。However, the non-oriented electrical steel sheet having an electric insulating coating having excellent coating characteristics disclosed in Japanese Patent Publication No. 50-15013 has a problem in slipperiness after strain relief annealing. there were. When using non-oriented electrical steel sheets for iron cores of motors, etc. as described above, after punching into a specified shape, strain relief annealing is performed, and a specified number of sheets are stacked and fixed by welding, caulking or bonding, etc. However, automation of this manufacturing process has been developed in recent years, and the punched sheet after strain relief annealing has slipperiness on the guide during the manufacturing process, and the gap between the punched sheets when laminating the punched sheets. It is important to have a slip property.
【０００６】上記すべり性が劣っていると、製造工程中
のガイド上をスムースに移動しなかったり、打抜板の表
面に疵がついたり、或いは皮膜を剥離したりするもので
ある。一方、鉄芯に積層時に所定枚数の打抜板の断面を
自動矯正機で整える場合、すべり性が悪いと、打抜板の
断面を疵つけたり、或いは腰折れを発生させるものであ
る。If the slipperiness is inferior, it may not move smoothly on the guide during the manufacturing process, may have a flaw on the surface of the punched plate, or may peel off the film. On the other hand, when the cross sections of a predetermined number of punched plates are arranged with an automatic straightening machine when laminated on an iron core, if the slipperiness is poor, the cross sections of the punched plates will be flawed or the waist will be broken.
【０００７】本発明は、上記特公昭５０−１５０１３号
公報に開示された皮膜特性の優れた電気絶縁皮膜を有す
る無方向性電磁鋼板の難点を解決し、高い占積率と共に
優れた打抜性、密着性及び歪取り焼鈍後の優れたすべり
性を付与する処理方法を提供することを目的とする。The present invention solves the drawbacks of the non-oriented electrical steel sheet having an electric insulating coating having excellent coating characteristics disclosed in Japanese Patent Publication No. 50-15013, and has a high space factor and excellent punchability. It is an object of the present invention to provide a treatment method for imparting excellent adhesion and excellent slipperiness after stress relief annealing.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、クロム酸
系溶液に、酢酸ビニル、ブタジエン−スチレン共重合
物、アクリル樹脂等の従来のエマルジョンタイプの樹脂
を添加した処理液で形成された絶縁皮膜では、皮膜の無
機成分とエマルジョン樹脂との間に有効な化学結合が得
られず、その結果、歪取り焼鈍によって絶縁皮膜中の樹
脂成分が劣化し、歪取り焼鈍後のすべり性が低下するこ
とを見出した。そこで、本発明者らはエマルジョン樹
脂、皮膜構造等について種々検討を行った結果、エマル
ジョン樹脂として未硬化のエポキシ樹脂を用い、エポキ
シ樹脂硬化剤としてクロム酸系溶液自身を用いることに
よって、歪取り焼鈍後のすべり性が格段に向上すること
を見出し、本発明を完成した。The present inventors have formed a treatment liquid in which a conventional emulsion type resin such as vinyl acetate, butadiene-styrene copolymer, acrylic resin, etc. is added to a chromic acid type solution. In the insulating film, an effective chemical bond cannot be obtained between the inorganic component of the film and the emulsion resin, and as a result, the resin component in the insulating film deteriorates due to strain relief annealing, and the slip property after stress relief annealing decreases. I found that Therefore, as a result of various studies on the emulsion resin, the film structure, and the like, the present inventors have used the uncured epoxy resin as the emulsion resin and the chromic acid solution itself as the epoxy resin curing agent to obtain strain relief annealing. The present inventors have completed the present invention by finding that the slipperiness afterward is remarkably improved.
【０００９】すなわち、本発明は以下の構成を要旨とす
る。すなわち、（１）電磁鋼板の表面にクロム酸系溶液
と、クロム酸金属塩（ＣｒＯ3 に換算して）１重量部に
対して、未硬化の水分散性エポキシ樹脂エマルジョン
（樹脂固形分に換算して）０．０１〜５．０重量部を主
成分とする処理液を薄く均一に塗布した後、焼付けるこ
とを特徴とする高い占積率を有し、打抜性と密着性に優
れ、しかも歪取り焼鈍後に優れたすべり性を発揮する電
磁鋼板の電気絶縁皮膜処理方法、及び（２）電磁鋼板の
表面にクロム酸系溶液と、クロム酸金属塩（ＣｒＯ3 に
換算して）１重量部に対して、エポキシ当量が１２００
以下の未硬化の水分散性エポキシ樹脂エマルジョン（樹
脂固形分に換算して）０．０１〜５．０重量部を主成分
とする処理液を薄く均一に塗布した後、焼付けることを
特徴とする高い占積率を有し、打抜性と密着性に優れ、
しかも歪取り焼鈍後に極めて優れたすべり性を発揮する
電磁鋼板の電気絶縁皮膜処理方法である。That is, the present invention has the following structures. That is, (1) An uncured water-dispersible epoxy resin emulsion (converted to resin solid content) is added to 1 part by weight of a chromic acid-based solution and a chromic acid metal salt (converted to CrO 3 ) on the surface of an electromagnetic steel sheet. A) A processing liquid containing 0.01 to 5.0 parts by weight as a main component is thinly and uniformly applied, and then baked, which has a high space factor and is excellent in punching property and adhesion. In addition, a method for treating an electrical insulating film on an electrical steel sheet that exhibits excellent slip properties after strain relief annealing, and (2) a chromic acid-based solution on the surface of the electrical steel sheet and a chromic acid metal salt (converted to CrO 3 ) 1 Epoxy equivalent to 1200 parts by weight
The following uncured water-dispersible epoxy resin emulsion (converted into resin solid content) is used to apply 0.01 to 5.0 parts by weight of a treatment liquid as a main component thinly and uniformly, followed by baking. Has a high space factor, excellent punchability and adhesion,
Moreover, it is a method for treating an electrical insulating film on an electrical steel sheet that exhibits extremely excellent slip properties after strain relief annealing.
【００１０】以下、本発明の内容を詳細に説明する。 〔本発明で使用する無機化合物〕本発明でいうクロム酸
系溶液とはカルシウム、マグネシウム、亜鉛等の重クロ
ム酸塩または無水クロム酸にカルシウム、マグネシウ
ム、亜鉛等の２価の酸化物、水酸化物、炭酸塩を溶解し
たものの１種または２種以上の混合溶液である。なお、
処理液の安定のためには、２価の金属の酸化物、水酸化
物、炭酸塩の１種または２種以上をほぼ飽和の状態ない
し過飽和の状態に溶解するのが良い。The contents of the present invention will be described in detail below. [Inorganic compound used in the present invention] The chromic acid-based solution as used in the present invention means dichromate such as calcium, magnesium and zinc or chromic anhydride, a divalent oxide such as calcium, magnesium and zinc, and hydroxide. Or a mixed solution of two or more of the above substances and carbonates. In addition,
To stabilize the treatment liquid, it is preferable to dissolve one or more divalent metal oxides, hydroxides, and carbonates in a substantially saturated state or a supersaturated state.
【００１１】〔本発明で使用するエポキシ樹脂エマルジ
ョン〕本発明では、特に未硬化のエポキシ樹脂をエマル
ジョンとしたものを用いる。即ち、エポキシ樹脂モノマ
ーを触媒等を用いて重合せしめた比較的低分子量のもの
を言い、エポキシ樹脂硬化剤を用いて架橋反応を起こさ
しめる以前のものである。硬化後のエポキシ樹脂を用い
た場合では、単にクロム酸塩と樹脂の混合物が得られる
のみで、本発明によって得られる密着性、歪取り焼鈍後
のすべり性等の諸特性が発現しない。また、エポキシ等
量が１２００以下の未硬化のエポキシ樹脂エマルジョン
を用いた場合では、歪取り焼鈍後のすべり性は更に向上
する。エポキシ樹脂の種類としては、ビスフェノールＡ
型、ビスフェノールＦ型、ノボラック型、グリシジル
型、環状脂肪族型、複素環式型等が挙げられる。エポキ
シ樹脂エマルジョンは、これらのエポキシ樹脂を乳化剤
の存在下で通常の乳化方法により製造される。あるい
は、エポキシ樹脂モノマーに水酸基等の親水基を導入
し、自己分散型としたものでも良い。[Epoxy Resin Emulsion Used in the Present Invention] In the present invention, an uncured epoxy resin emulsion is used. That is, it means a relatively low molecular weight compound obtained by polymerizing an epoxy resin monomer by using a catalyst or the like, which is before the crosslinking reaction is caused by using an epoxy resin curing agent. When the cured epoxy resin is used, only a mixture of chromate and resin is obtained, and various properties such as adhesion and slipperiness after strain relief annealing obtained by the present invention are not exhibited. Further, when an uncured epoxy resin emulsion having an epoxy equivalent of 1200 or less is used, the slip property after strain relief annealing is further improved. As the type of epoxy resin, bisphenol A
Type, bisphenol F type, novolak type, glycidyl type, cycloaliphatic type, heterocyclic type and the like. The epoxy resin emulsion is produced by a usual emulsification method of these epoxy resins in the presence of an emulsifier. Alternatively, a self-dispersion type may be used by introducing a hydrophilic group such as a hydroxyl group into the epoxy resin monomer.
【００１２】〔配合比〕クロム酸金属塩（ＣｒＯ3 に換
算して）１重量部に対して、水分散性エマルジョン樹脂
量を０．０１〜５．０重量部に限定した理由であるが、
０．０１以下では充分な打抜性、皮膜自体の密着性が得
られず、５．０以上では歪取り焼鈍時に皮膜の剥離を起
こして十分な耐熱性が得られない。尚、本発明に於ける
処理液としては以上述べた２成分を含むことが必須であ
るが、この他にグリセリン等の還元剤、ホウ酸、コロイ
ド状シリカ等のガラス形成剤、非イオン界面活性剤等の
分散性向上剤を添加してもよい。[Compounding ratio] The reason is that the amount of the water-dispersible emulsion resin is limited to 0.01 to 5.0 parts by weight with respect to 1 part by weight of the chromate metal salt (converted to CrO 3 ).
If it is 0.01 or less, sufficient punching properties and adhesion of the film itself cannot be obtained, and if it is 5.0 or more, peeling of the film occurs during strain relief annealing and sufficient heat resistance cannot be obtained. It is essential that the treatment liquid in the present invention contains the above-mentioned two components, but in addition to this, a reducing agent such as glycerin, a glass forming agent such as boric acid or colloidal silica, a nonionic surface active agent. A dispersibility improver such as an agent may be added.
【００１３】〔処理法〕処理液の塗布、焼付け方法であ
るが、処理液をロールコーター等で所定量塗布し、２５
０℃から７００℃の焼付け温度で短時間焼付けるだけで
よい。[Treatment Method] A coating method and a baking method of the treatment liquid. A predetermined amount of the treatment liquid is applied by a roll coater or the like,
Only baking for a short time at a baking temperature of 0 ° C to 700 ° C is required.
【００１４】〔塗布量〕次に電磁鋼板の表面に形成する
絶縁皮膜量は特に限定しないが、０．５ｇ／ｍ2 〜５ｇ
／ｍ2 の範囲が適当で０．５ｇ／ｍ2 未満では十分な打
抜性が得られず、一方５ｇ／ｍ2 を超えると、歪取り焼
鈍時に絶縁皮膜の剥離の危険性があり、占積率も劣る。[Coating amount] Next, the amount of the insulating film formed on the surface of the electromagnetic steel sheet is not particularly limited, but is 0.5 g / m 2 to 5 g.
/ Range of m 2 is not sufficient punching property can be obtained in less than suitable and 0.5 g / m 2, whereas when it exceeds 5 g / m 2, at the time of stress relief annealing the risk of peeling of the insulating film, occupied The product ratio is also inferior.
【００１５】すでに述べた如く、本発明に使用される水
分散性エポキシ樹脂エマルジョンは未硬化物であり、そ
の添加量はクロム酸金属塩（ＣｒＯ3 に換算して）１重
量部に対して、０．０１〜５．０重量部に限定される。
この条件において、高い占積率を持ち打抜性、密着性、
歪取り焼鈍後のすべり性に優れた、電気絶縁皮膜が得ら
れる。As described above, the water-dispersible epoxy resin emulsion used in the present invention is an uncured product, and the addition amount thereof is 1 part by weight with respect to 1 part by weight of a chromate metal salt (calculated as CrO 3 ). It is limited to 0.01 to 5.0 parts by weight.
Under these conditions, it has a high space factor, punchability, adhesion,
An electrical insulating film having excellent slip properties after strain relief annealing can be obtained.
【００１６】[0016]
【作用】本発明では、エマルジョン樹脂として未硬化の
エポキシ樹脂を用いることにより、クロム酸がエポキシ
樹脂硬化剤となることから、クロム酸塩と樹脂の間に強
固な化学結合を形成するのである。その結果、従来歪取
り焼鈍によって、樹脂成分はその大部分が熱分解等によ
り消失したり、変質するのに対し、本発明におけるエポ
キシ樹脂成分は歪取り焼鈍後もかなりの部分が劣化する
ことなく、樹脂の状態で存在する。従って、歪取り焼鈍
後も皮膜特性は良好で、優れたすべり性が得られるもの
である。なお、エポキシ等量が１２００以下のエポキシ
樹脂エマルジョンを使用した場合、クロム酸との反応が
数多く起こることにより、クロム酸との結合が更に強固
となり、極めて優れたすべり性を示すものと考えられ
る。また、占積率、打抜性、密着性の良好であるのは、
無機有機混合皮膜の良特性を保持しているからである。In the present invention, by using an uncured epoxy resin as the emulsion resin, chromic acid serves as an epoxy resin curing agent, so that a strong chemical bond is formed between the chromate and the resin. As a result, by conventional strain relief annealing, most of the resin component disappears or deteriorates due to thermal decomposition or the like, whereas the epoxy resin component of the present invention does not deteriorate significantly after strain relief annealing. Exist in the state of resin. Therefore, the film characteristics are good even after the strain relief annealing, and excellent slip properties can be obtained. When an epoxy resin emulsion having an epoxy equivalent of 1200 or less is used, it is considered that a large number of reactions with chromic acid cause the bond with chromic acid to become stronger and exhibit extremely excellent slip properties. In addition, the space factor, punching property and adhesion are good.
This is because the good characteristics of the inorganic-organic mixed film are retained.
【００１７】[0017]
【実施例】次に本発明の実施例を比較例と共に説明す
る。電磁鋼板（２．０％Ｓｉ含有、板厚０．５mm、表面
粗さＲａ０．２０μｍ）の表面に、表１に示した処理液
を、それぞれ塗布しゴムロールで絞り、４５０℃に設定
した焼鈍炉で６０秒間焼付けた。この試料とその後、ｄ
ｒｙ窒素雰囲気で、７５０℃×２時間歪取り焼鈍を行っ
た試料について試験した。なお、樹脂エマルジョン濃度
はすべて５０％のものを使用した。EXAMPLES Next, examples of the present invention will be described together with comparative examples. Annealing furnace in which the treatment liquids shown in Table 1 are applied to the surface of an electromagnetic steel plate (containing 2.0% Si, plate thickness 0.5 mm, surface roughness Ra 0.20 μm), squeezed with a rubber roll, and set to 450 ° C. And baked for 60 seconds. This sample and then d
The sample was subjected to strain relief annealing at 750 ° C. for 2 hours in a ry nitrogen atmosphere and tested. All resin emulsion concentrations were 50%.
【００１８】[0018]
【表１】 [Table 1]
【００１９】以上の実施例と比較例の結果を表２に示
す。表２からも明らかな如く、本実施例によれば、高い
占積率と優れた打抜性、密着性、すべり性を持つ電気絶
縁皮膜が得られた。The results of the above examples and comparative examples are shown in Table 2. As is clear from Table 2, according to this example, an electric insulating film having a high space factor and excellent punching property, adhesiveness, and slip property was obtained.
【００２０】[0020]
【表２】 [Table 2]
【００２１】〔すべり性測定法〕すべり性の測定には、
市販の表面性測定機を用いた。測定条件は垂直荷重１０
０ｇとし、φ１０mm鋼球ボールを用いて、移動速度２０
mm／sec.、大気中で行った。評価は１０回の繰り返し往
復摩擦の後、表面に皮膜の剥がれや大きな疵の残らなか
ったサンプルを合格とし、鋼球ボールが引掛かったり地
鉄が現れる程の疵が付いたサンプルは不合格とした。[Slidability Measuring Method] To measure the slipperiness,
A commercially available surface measuring machine was used. Vertical load is 10
0 g, using a φ10 mm steel ball, moving speed 20
mm / sec., in air. After 10 times of repeated reciprocal rubbing, the sample with no film peeling or large flaws left on the surface was judged as acceptable, and the sample with flaws enough to catch steel balls or show base metal was rejected. did.
【００２２】[0022]
【発明の効果】以上詳述した如く、本発明方法によれ
ば、高い占積率と優れた打抜性、密着性、すべり性を持
つ電気絶縁皮膜を有する電磁鋼板が得られるものであ
る。As described in detail above, according to the method of the present invention, it is possible to obtain an electromagnetic steel sheet having an electric insulating film having a high space factor and excellent punching property, adhesive property and slip property.
Claims (2)
ロム酸金属塩（ＣｒＯ3 に換算して）１重量部に対し
て、未硬化の水分散性エポキシ樹脂エマルジョン（樹脂
固形分に換算して）０．０１〜５．０重量部を主成分と
する処理液を薄く均一に塗布した後、焼付けることを特
徴とする高い占積率を有し、打抜性と密着性に優れ、し
かも歪取り焼鈍後に優れたすべり性を発揮する電磁鋼板
の電気絶縁皮膜処理方法。1. An uncured water-dispersible epoxy resin emulsion (converted to resin solids) per 1 part by weight of a chromic acid-based solution and a chromic acid metal salt (converted to CrO 3 ) on the surface of a magnetic steel sheet. A) A processing liquid containing 0.01 to 5.0 parts by weight as a main component is thinly and uniformly applied, and then baked, which has a high space factor and is excellent in punching property and adhesion. Moreover, a method for treating an electrical insulating film on an electrical steel sheet that exhibits excellent slip properties after stress relief annealing.
ロム酸金属塩（ＣｒＯ3 に換算して）１重量部に対し
て、エポキシ当量が１２００以下の未硬化の水分散性エ
ポキシ樹脂エマルジョン（樹脂固形分に換算して）０．
０１〜５．０重量部を主成分とする処理液を薄く均一に
塗布した後、焼付けることを特徴とする高い占積率を有
し、打抜性と密着性に優れ、しかも歪取り焼鈍後に極め
て優れたすべり性を発揮する電磁鋼板の電気絶縁皮膜処
理方法。2. An uncured water-dispersible epoxy resin emulsion having an epoxy equivalent of 1200 or less with respect to 1 part by weight of a chromic acid-based solution and a chromic acid metal salt (converted to CrO 3 ) on the surface of an electromagnetic steel sheet. 0 (converted to resin solids)
It has a high space factor, which is characterized by baking thinly and uniformly a treatment liquid containing 01 to 5.0 parts by weight as a main component, and then has a high space factor, is excellent in punchability and adhesion, and is strain relief annealing. A method for electrical insulating film treatment of electrical steel sheets that later exhibits extremely excellent slip properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243092A JPH05263262A (en) | 1992-01-27 | 1992-01-27 | Treatment of electrical insulating film of magnetic steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243092A JPH05263262A (en) | 1992-01-27 | 1992-01-27 | Treatment of electrical insulating film of magnetic steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05263262A true JPH05263262A (en) | 1993-10-12 |
Family
ID=11805075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1243092A Pending JPH05263262A (en) | 1992-01-27 | 1992-01-27 | Treatment of electrical insulating film of magnetic steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05263262A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07286284A (en) * | 1994-04-20 | 1995-10-31 | Kawasaki Steel Corp | Insulating film-coated magnetic steel sheet excellent in coating stability, weldability and punchability |
| JPH09122582A (en) * | 1995-11-08 | 1997-05-13 | Kawasaki Steel Corp | Non-oriented silicon steel sheet excellent in punchability and annealed seizing resistance |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107468A (en) * | 1989-09-22 | 1991-05-07 | Kobe Steel Ltd | Formation of colored insulating coat on electrical steel sheet |
| JPH04110476A (en) * | 1990-08-30 | 1992-04-10 | Kobe Steel Ltd | Production of electrical steel sheet with insulating coating film having superior adhesion and insulating property even after strain relief annealing |
| JPH04235286A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Magnetic steel sheet having electric insulating film of good weldability |
| JPH04235287A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Method for forming insulating film on magnetic steel sheet |
| JPH05179458A (en) * | 1991-12-28 | 1993-07-20 | Nkk Corp | Electric steel sheet with insulating coating film excellent in scratch resistance and its production |
-
1992
- 1992-01-27 JP JP1243092A patent/JPH05263262A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107468A (en) * | 1989-09-22 | 1991-05-07 | Kobe Steel Ltd | Formation of colored insulating coat on electrical steel sheet |
| JPH04110476A (en) * | 1990-08-30 | 1992-04-10 | Kobe Steel Ltd | Production of electrical steel sheet with insulating coating film having superior adhesion and insulating property even after strain relief annealing |
| JPH04235286A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Magnetic steel sheet having electric insulating film of good weldability |
| JPH04235287A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Method for forming insulating film on magnetic steel sheet |
| JPH05179458A (en) * | 1991-12-28 | 1993-07-20 | Nkk Corp | Electric steel sheet with insulating coating film excellent in scratch resistance and its production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07286284A (en) * | 1994-04-20 | 1995-10-31 | Kawasaki Steel Corp | Insulating film-coated magnetic steel sheet excellent in coating stability, weldability and punchability |
| JPH09122582A (en) * | 1995-11-08 | 1997-05-13 | Kawasaki Steel Corp | Non-oriented silicon steel sheet excellent in punchability and annealed seizing resistance |
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