JP5750275B2 - Insulated steel sheet and laminated iron core - Google Patents
Insulated steel sheet and laminated iron core Download PDFInfo
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- JP5750275B2 JP5750275B2 JP2011032637A JP2011032637A JP5750275B2 JP 5750275 B2 JP5750275 B2 JP 5750275B2 JP 2011032637 A JP2011032637 A JP 2011032637A JP 2011032637 A JP2011032637 A JP 2011032637A JP 5750275 B2 JP5750275 B2 JP 5750275B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 54
- 239000010959 steel Substances 0.000 title claims description 54
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 26
- 238000000576 coating method Methods 0.000 claims description 50
- 239000011248 coating agent Substances 0.000 claims description 45
- 239000011347 resin Substances 0.000 claims description 29
- 229920005989 resin Polymers 0.000 claims description 29
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 13
- 229920006223 adhesive resin Polymers 0.000 claims description 10
- 239000004840 adhesive resin Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 description 23
- 230000001070 adhesive effect Effects 0.000 description 23
- 238000000034 method Methods 0.000 description 22
- 239000002585 base Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000009477 glass transition Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000576 Laminated steel Inorganic materials 0.000 description 1
- -1 acryl Chemical group 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
本発明は、回転器や変圧器等に用いる加熱接着型の絶縁被膜付き電磁鋼板、およびそれを用いた積層鉄心に関する。 The present invention relates to a heat-bonded electrical steel sheet with an insulating coating used for a rotor, a transformer, and the like, and a laminated iron core using the same.
従来、回転器、変圧器等の電気機器に使用する鉄心は、渦電流を減少させるための絶縁被膜を電磁鋼板に被覆し、ついで打ち抜きまたはせん断加工を施して、複数枚の鋼板を積み重ねたのち、溶接、カシメまたは接着剤により固着して製造していた。しかしながら、溶接により電磁鋼板を固着する方法には、鉄心のエッジ部が短絡して絶縁性が低下するという問題や、熱歪みの発生によって鉄心の磁気特性が劣化するという問題があった。
また、カシメにより電磁鋼板を固着する方法には、加工歪みの発生によって磁気特性が劣化すると同時に、電磁鋼板の厚みが薄くなった場合、十分なカシメ強度が得られないという問題があった。さらに、接着剤により電磁鋼板を固着する方法には、上述したような磁気特性の劣化の問題はあまりないものの、電磁鋼板の１枚１枚に接着剤を塗布する必要があるため作業性が極めて悪く、また、必ずしも絶縁被膜間での接着力が十分とはならないという問題があった。
Conventionally, iron cores used in electrical equipment such as rotors and transformers are coated with an insulating steel sheet to reduce eddy currents, then punched or sheared, and then stacked together. It was manufactured by fixing with welding, caulking or adhesive. However, the method of fixing the magnetic steel sheet by welding has a problem that the edge portion of the iron core is short-circuited and the insulating property is lowered, and a magnetic property of the iron core is deteriorated due to the occurrence of thermal strain.
Further, the method of fixing the electromagnetic steel sheet by caulking has a problem that sufficient caulking strength cannot be obtained when the thickness of the electromagnetic steel sheet is reduced at the same time as the magnetic characteristics are deteriorated due to generation of processing strain. Furthermore, although the method of fixing the magnetic steel sheet with an adhesive does not have much of the problem of deterioration of the magnetic properties as described above, the workability is extremely high because it is necessary to apply the adhesive to each of the magnetic steel sheets. In addition, there is a problem that the adhesive force between the insulating coatings is not always sufficient.
これに対し、特許文献１には、ガラス転移温度：60℃以上の熱可塑性アクリル樹脂エマルジョンや、エポキシ樹脂ヱマルジョンを主成分とする組成物を塗布し、乾燥して得られた鋼板を、積層し、加熱加圧することで積層鉄心を製造する方法が開示されている。この方法は、接着剤を塗布する工程を省略したものであり、加工歪みの影響を受け難いだけでなく、コイル状に巻いても鋼板の被膜同士が接着して剥がれなくなる、いわゆるブロッキングの発生が抑制できるという利点を有する。 On the other hand, in Patent Document 1, a steel plate obtained by applying a thermoplastic acrylic resin emulsion having a glass transition temperature of 60 ° C. or higher or a composition mainly composed of epoxy resin-margin and drying is laminated. A method of manufacturing a laminated iron core by heating and pressurizing is disclosed. This method omits the step of applying an adhesive, and is not only easily affected by processing distortion, but also causes the so-called blocking, in which the coatings of the steel plates do not peel off even when wound in a coil shape. It has the advantage that it can be suppressed.
しかしながら、上記方法で製造された電磁鋼板(以下、「従来の加熱接着型電磁鋼板」という)を、加熱加圧して得られた積層鉄心は、接着面積が小さな部分が発生する場合があり、その場合、層間はく離(接着面でのはく離)が生じるという問題があった。
特に、上掲した特許文献１に記載の方法では、鋼板板厚が薄い場合や絶縁被膜の厚みが薄い場合などに、絶縁被膜や鋼板の凹凸の影響を受けやすくなるという問題が顕在化していた。
However, the laminated iron core obtained by heating and pressurizing the electromagnetic steel sheet manufactured by the above method (hereinafter referred to as `` conventional heat-bonded electromagnetic steel sheet '') may have a portion with a small bonding area. In this case, there was a problem that delamination (peeling on the adhesive surface) occurred.
In particular, in the method described in Patent Document 1 described above, there has been a problem that the steel plate is easily affected by the unevenness of the insulating coating or the steel plate when the steel plate is thin or the insulating coating is thin. .
この点、特許文献２には、粒径：0.01〜0.5μｍの微粒子重合体を絶縁被膜に分散させることで、絶縁被膜の膜厚を1.5μｍ程度に薄くしても、十分な接着強度が得られるという技術が開示されている。 In this respect, Patent Document 2 discloses that a fine particle polymer having a particle size of 0.01 to 0.5 μm is dispersed in an insulating film, so that sufficient adhesive strength can be obtained even if the film thickness of the insulating film is reduced to about 1.5 μm. The technique of being able to be performed is disclosed.
しかしながら、上掲した特許文献２に開示の技術でも、板厚が薄い場合や表面粗度が大きい場合には、接着していない面積が大きくなりやすく、接着強度が十分とは言えなかった。
上記したメカニズムを、さらに図を用いて説明する。図１に、従来の加熱接着型電磁鋼板を積層して得られる積層鉄心の、接着部分における断面模式図を示す。同図に示したように、実際の板形状は平坦でなく凹凸を有している（図１(a)）。従って、絶縁被膜の膜厚が薄くなるに従い、図１(b)、(c)に示したように、加熱融着する部分が限られて、未接着部分が多く残ることになる。その結果、鋼板同士の接着強度は大きく低下することになる。
However, even with the technique disclosed in Patent Document 2 described above, when the plate thickness is thin or the surface roughness is large, the area that is not bonded tends to increase, and the bonding strength cannot be said to be sufficient.
The above mechanism will be further described with reference to the drawings. In FIG. 1, the cross-sectional schematic diagram in the adhesion | attachment part of the laminated iron core obtained by laminating | stacking the conventional heat bonding type | mold electromagnetic steel plate is shown. As shown in the figure, the actual plate shape is not flat but has irregularities (FIG. 1 (a)). Therefore, as the thickness of the insulating coating is reduced, as shown in FIGS. 1B and 1C, the portion to be heat-sealed is limited and many unbonded portions remain. As a result, the adhesive strength between the steel plates is greatly reduced.
本発明は、上記した現状に鑑み開発されたもので、表面に接着性樹脂を含有する絶縁被膜を有する電磁鋼板であって、それらを積層し加熱加圧した場合に、絶縁被膜同士が十分な接着強度を有する電磁鋼板を提供することを目的とする。特に、鋼板の板厚が0.35mm以下と薄く、接着層の平均厚みが４μｍ以下と薄い場合であっても、十分な接着強度を有する電磁鋼板を提供することを目的とする。 The present invention has been developed in view of the above-described situation, and is an electrical steel sheet having an insulating coating containing an adhesive resin on the surface, and when these are laminated and heated and pressed, the insulating coatings are sufficient. An object is to provide an electrical steel sheet having adhesive strength. In particular, an object of the present invention is to provide a magnetic steel sheet having sufficient adhesive strength even when the steel sheet has a thin thickness of 0.35 mm or less and the average thickness of the adhesive layer is 4 μm or less.
発明者らは、上記した課題を解決すべく鋭意研究を行った。その結果、鉄心用電磁鋼板の絶縁被膜中に、所定の粒径の粒状樹脂を含有させることにより、所期した目的が有利に達成されるとの知見を得た。すなわち、鉄心作製のために鋼板を加熱加圧した場合、絶縁被膜のベース中に、ベース厚よりも大きい粒径の粒状樹脂が含有されていると、この粒状樹脂が優先的に鋼板表面で融着すると共に押し潰されて拡がるため、未接着部の面積が大幅に減少し、鋼板同士の接着強度が向上することを見出した。 The inventors have intensively studied to solve the above problems. As a result, it has been found that the intended purpose can be advantageously achieved by including a granular resin having a predetermined particle diameter in the insulating coating of the magnetic steel sheet for iron core. That is, when a steel sheet is heated and pressed to produce an iron core, if a granular resin having a particle size larger than the base thickness is contained in the base of the insulating coating, the granular resin is preferentially melted on the surface of the steel sheet. It has been found that since it is worn and crushed and expanded, the area of the unbonded portion is greatly reduced, and the adhesive strength between the steel plates is improved.
すなわち、本発明の要旨構成は次のとおりである。
１．加熱および/または加圧により接着可能な絶縁被膜を有する電磁鋼板であって、該絶縁被膜は、ベースとなる被膜中に加熱および/または加圧により変形する粒状樹脂が分散する構造になり、該ベースとなる被膜は、１種の接着性樹脂または２種以上の接着性樹脂の混合物であり、前記粒状樹脂は、スチレン、アクリル、エポキシ、フェノールおよびシリコーンのうちの１種または２種以上の混合であり、該粒状樹脂の平均粒径が3.0〜50.0μｍで、かかる粒状樹脂を該絶縁被膜中に1.0〜50質量％の割合で含み、さらに該絶縁被膜の片面当たりの付着量が4.0 g/m2以下であることを特徴とする絶縁被膜付き電磁鋼板。
That is, the gist configuration of the present invention is as follows.
1. An electromagnetic steel sheet having a bondable insulating film by heating and / or pressurization, the insulating film becomes a structure in which granular resin that is deformed by heat and / or pressure to the film in which the base is dispersed, the The base coating is one kind of adhesive resin or a mixture of two or more kinds of adhesive resins, and the granular resin is a mixture of one or more of styrene, acrylic, epoxy, phenol and silicone. , and the average particle diameter of 3.0 ～50.0Myuemu of particulate resin, such granular resin in the insulating film comprises in a proportion of 1.0 to 50 mass%, further adhesion amount per one side of the insulating coating 4.0 g / m 2 or less electrical steel sheet with an insulating coating, characterized by being 2 or less.
２．前記絶縁被膜の片面当たりの付着量が0.05 g/m２以上であることを特徴とする前記１に記載の絶縁被膜付き電磁鋼板。 2. 2. The electrical steel sheet with an insulating coating according to 1, wherein an adhesion amount per one side of the insulating coating is 0.05 g / m 2 or more.
３．前記１または２に記載の電磁鋼板を２枚以上積層して、加熱および／または加圧により接着させてなり、鉄心占積率が96.0％以上であることを特徴とする積層鉄心。 3. A laminated iron core, wherein two or more electromagnetic steel sheets according to 1 or 2 above are laminated and adhered by heating and / or pressing, and the iron core space factor is 96.0% or more.
本発明によれば、加熱および／または加圧により接着可能な絶縁被膜を有する電磁鋼板を、積層して加熱加圧した場合に、絶縁被膜同士が十分な接着強度を有する電磁鋼板を提供することができる。特に、本発明に従う電磁鋼板は、鋼板の板厚が薄く、また絶縁被膜の平均厚みが４μｍ以下と薄くても、十分な接着強度を発揮するため、組み上がった鉄心の占積率を高くすることができる。 According to the present invention, there is provided an electrical steel sheet having sufficient adhesive strength between insulating coatings when the electrical steel sheets having an insulating coating that can be bonded by heating and / or pressurization are laminated and heated and pressed. Can do. In particular, the electrical steel sheet according to the present invention exhibits sufficient adhesive strength even when the steel sheet thickness is thin and the average thickness of the insulating coating is as thin as 4 μm or less, so that the space factor of the assembled iron core is increased. be able to.
以下、本発明を具体的に説明する。
まず、本発明の絶縁被膜付き電磁鋼板について説明する。
本発明の絶縁被膜付き電磁鋼板は、電磁鋼板の少なくとも一方の表面に絶縁被膜を有する絶縁被膜付き電磁鋼板であって、その絶縁被膜は加熱および／または加圧により接着する性能を有している。
特に、本発明の絶縁被膜中には、図２に示すように、加熱および／または加圧により変形して接着する粒状樹脂が分散しており、その平均粒径が1.0〜50.0μｍの範囲であることを特徴とする。
Hereinafter, the present invention will be specifically described.
First, the electromagnetic steel sheet with an insulating coating according to the present invention will be described.
The electrical steel sheet with an insulating coating of the present invention is an electrical steel sheet with an insulating coating having an insulating coating on at least one surface of the electrical steel sheet, and the insulating coating has a performance of being bonded by heating and / or pressurization. .
In particular, in the insulating coating of the present invention, as shown in FIG. 2, a granular resin that is deformed and bonded by heating and / or pressurizing is dispersed, and the average particle diameter is in the range of 1.0 to 50.0 μm. It is characterized by being.
本発明に用いられる電磁鋼板としては、特段の限定はなく、公知のもの、すなわち、無方向性、１方向性、２方向性などいずれの電磁鋼板であっても用いることができる。また、電磁鋼板の鋼板組成は、特に限定されず、公知のものを用いることができる。さらに、電磁鋼板の板厚は、特に限定されないが、一般的な鋼板の厚みである0.05〜1.0mm程度とするのが好ましい。特に、本発明は、板厚が0.35mm以下の鋼板に適用して有利なものである。 The electrical steel sheet used in the present invention is not particularly limited, and any known electrical steel sheet such as non-directional, unidirectional, bi-directional, etc. can be used. Moreover, the steel plate composition of an electromagnetic steel plate is not specifically limited, A well-known thing can be used. Further, the thickness of the electromagnetic steel sheet is not particularly limited, but is preferably about 0.05 to 1.0 mm which is the thickness of a general steel sheet. In particular, the present invention is advantageous when applied to a steel sheet having a thickness of 0.35 mm or less.
加えて、鋼板の粗度も特に限定はされないが、算術平均粗さRa（JIS B 0601-2001）で、0.1〜1.0μｍ程度の範囲が好適である。また、厚みがO.35mm以下の薄鋼板では、鋼板表面の粗度が高くなる傾向にあるため、本発明の効果が特に大きくなり、鋼板同士の十分な接着強度を保ちながら、鉄心の占積率を高くすることができる。 In addition, the roughness of the steel sheet is not particularly limited, but an arithmetic average roughness Ra (JIS B 0601-2001) is preferably in the range of about 0.1 to 1.0 μm. In addition, in a thin steel sheet having a thickness of O.35 mm or less, since the roughness of the steel sheet surface tends to be high, the effect of the present invention is particularly great, while maintaining sufficient adhesive strength between the steel sheets while occupying the iron core. The rate can be increased.
本発明に用いられる加熱および／または加圧により接着可能な絶縁被膜のベースとなる被膜は、特に限定されず、アクリル系、エポキシ系、フェノール系およびシリコーン系等の接着性樹脂のいずれもが好適に使用でき、これらを、１種または２種以上の接着性樹脂の混合物として用いることができる。なお、アミン系硬化剤、シリカ等の添加物を本発明の効果を損なわない範囲で、絶縁被膜に対し、0.01〜40.0質量％程度添加することができる。
また、上記の接着性樹脂は、ガラス転移温度または軟化温度が60℃以上であることが好ましい。ガラス転移温度または軟化温度が60℃以上であると、良好な接着強度が得られると共に、鋼板をコイル状に巻き取った場合においても、鋼板同士のいわゆるブロッキングを抑制する効果がある。
The base film of the insulating film that can be bonded by heating and / or pressure used in the present invention is not particularly limited, and any of acrylic, epoxy, phenolic, and silicone adhesive resins is suitable. These can be used as a mixture of one or more adhesive resins. In addition, about 0.01-40.0 mass% can be added with respect to an insulating film in the range which does not impair the effect of this invention, such as an amine type hardening | curing agent and a silica.
The adhesive resin preferably has a glass transition temperature or a softening temperature of 60 ° C. or higher. When the glass transition temperature or softening temperature is 60 ° C. or higher, good adhesive strength can be obtained, and even when the steel plates are wound in a coil shape, there is an effect of suppressing so-called blocking between the steel plates.
本発明に用いられる粒状樹脂は、加熱および／または加圧により変形するものであることが必要である。その成分に特段の制限はないが、特に、スチレン、アクリル、エポキシ、フェノールおよびシリコーン等の粒状樹脂が好適に使用でき、これらのうちの１種または２種以上を混合して使用することができる。
また、本発明において、粒状樹脂の平均粒径は、1.0〜50.0μｍとする必要がある。1.0μｍに満たないと、未接着部分が大きくなり接着強度が低下する。一方、50.0μｍを越えると、粉吹きの問題が顕れる。好ましくは3.0〜30.0μｍの範囲である。
なお、上記の粒状樹脂の平均粒径は、走査型電子顕微鏡（ＳＥＭ）を用いて、粒状樹脂単体を観察する方法、絶縁被膜を表面から観察する方法、絶縁被膜を凍結破断させた破断面を観察する方法などにより求めることが可能である。
The granular resin used in the present invention is required to be deformed by heating and / or pressurization. Although there is no special restriction | limiting in the component, Especially granular resin, such as styrene, an acryl, an epoxy, a phenol, and silicone, can be used conveniently, and can use it by mixing 1 type, or 2 or more types of these. .
Moreover, in this invention, the average particle diameter of granular resin needs to be 1.0-50.0 micrometers. If it is less than 1.0 μm, the unbonded portion becomes large and the adhesive strength is lowered. On the other hand, if it exceeds 50.0 μm, the problem of powder blowing appears. Preferably it is the range of 3.0-30.0 micrometers.
The average particle diameter of the granular resin is determined by the method of observing the granular resin alone using a scanning electron microscope (SEM), the method of observing the insulating coating from the surface, or the fracture surface where the insulating coating is frozen and broken. It can be obtained by an observation method or the like.
本発明における絶縁被膜は、前記粒状樹脂を1.0〜50質量％の割合で含むことが必要である。というのは、1.0質量％に満たないと、高い接着強度が得られず、一方、50質量％を超えると、成膜性が低下し粉吹き性に劣るからである。 The insulating coating in the present invention needs to contain the granular resin in a proportion of 1.0 to 50% by mass. This is because if the amount is less than 1.0% by mass, high adhesive strength cannot be obtained, while if it exceeds 50% by mass, the film formability is lowered and the powder blowing property is poor.
本発明における絶縁被膜は、その性能を一層向上させるために、防錆剤等の添加剤を含有させることができる。この場合は、絶縁被膜の固形分の100質量部に対して30質量部以下とするのが好ましい。 In order to further improve the performance of the insulating coating in the present invention, an additive such as a rust inhibitor can be contained. In this case, the amount is preferably 30 parts by mass or less with respect to 100 parts by mass of the solid content of the insulating coating.
本発明における絶縁被膜の付着量は、4.0g/m２以下とする。4.0 g/m２を超えると鉄心占積率(加熱および／または加圧により積層接着された電磁鋼板の全体に対する地鉄の比率)が低下し、鉄心占積率を96.0％以上とすることができない。2.0 g/m２以下とするのがより好ましい。また、十分な層間接着力を得られるという点で、片面あたりの付着量として0.05 g/m２以上が好ましく、0.1 g/m２以上とすることがより好ましい。 The adhesion amount of the insulating coating in the present invention is 4.0 g / m 2 or less. If it exceeds 4.0 g / m 2 , the core space factor (the ratio of the ground iron to the whole of the magnetic steel sheets laminated and bonded by heating and / or pressurization) decreases, and the core space factor may be 96.0% or more. Can not. More preferably, it is 2.0 g / m 2 or less. In terms of obtaining a sufficient interlayer adhesion, preferably 0.05 g / m 2 or more as a deposition amount per side, more preferably set to 0.1 g / m 2 or more.
本発明の絶縁被膜付き電磁鋼板は、その製造方法を特に限定されず、常法に従えば良い。また、絶縁被膜の形成方法は、例えば、エマルジョン、ディスパージョン等の水系の接着性樹脂（粒状物資を含み、又はさらに添加剤を含む）をロールコーター法、フローコーター法、スプレー塗装、ナイフコーター法等、種々の方法で電磁鋼板に塗布し、ついで、一般的に実施されるような熱風式、赤外式、誘導加熱式等の方法で焼付け処理を行うなどが挙げられる。これらの塗布工程などは、電磁鋼板を切り板状としてから行ってもよいが、コイル状のままで塗装して焼付けした方が、生産性が高く、実用的である。 The manufacturing method of the electrical steel sheet with an insulating coating of the present invention is not particularly limited, and may be according to a conventional method. The insulating film is formed by, for example, a water-based adhesive resin such as an emulsion or a dispersion (including granular materials or further additives) in a roll coater method, flow coater method, spray coating, knife coater method. For example, it may be applied to a magnetic steel sheet by various methods, and then subjected to a baking treatment by a method such as a hot air method, an infrared method, an induction heating method or the like that is generally performed. These coating steps and the like may be performed after the electromagnetic steel sheet has been cut into a plate shape, but it is more practical and more productive to be coated and baked in a coil shape.
本発明に従う電磁鋼板を、積層し加熱加圧した場合、所定粒径の粒状樹脂が、鋼板表面で効果的に融着するため、絶縁被膜同士の間に隙間を生じることなく、十分に密接して接着することができる。そのため、接着不良による層間はく離を引き起こすおそれがない。また、本発明に従う電磁鋼板は、鉄心の製造中、絶縁性が低下したり、熱歪みや加工歪みにより磁気特性が劣化するという問題を引き起こすことがなく、また、絶縁被膜の形成後にさらに接着剤を塗布する必要がないので、作業性が悪いという問題も発生しない。 When the magnetic steel sheets according to the present invention are laminated and heated and pressed, the granular resin having a predetermined particle size is effectively fused on the steel sheet surface, so that there is no gap between the insulating coatings, and it is sufficiently intimate. Can be glued together. Therefore, there is no possibility of causing delamination due to poor adhesion. In addition, the electrical steel sheet according to the present invention does not cause a problem that the insulating properties are lowered during the production of the iron core or the magnetic properties are deteriorated due to thermal strain or processing strain. Since there is no need to apply the coating, the problem of poor workability does not occur.
本発明に従う鋼板を加熱する場合、その加熱温度は、用いられている絶縁被膜のベースとなる被膜を形成するマトリックス樹脂および粒状樹脂のガラス転移温度以上、または融点における流動性が発現される温度以上のいずれかであれば特に限定されない。なお、加熱温度は、具体的には100〜500℃程度、より好ましくは150〜300℃程度の範囲である。 When heating the steel sheet according to the present invention, the heating temperature is equal to or higher than the glass transition temperature of the matrix resin and the granular resin forming the coating that is the base of the insulating coating used, or higher than the temperature at which the fluidity at the melting point is expressed. If it is either, it will not specifically limit. The heating temperature is specifically in the range of about 100 to 500 ° C, more preferably about 150 to 300 ° C.
本発明に従う鋼板を加圧する場合、その加圧力は、4.90×105〜9.81×106Pa (４〜100kgf/cm2)であることが好ましい。9.81×105〜9.81×106Pa (10〜100kgf/cm2)であることがより好ましい。
また、本発明の積層電磁鋼板の製造における加圧時間は、10〜10000秒の範囲であるのが好ましい。
When the steel plate according to the present invention is pressed, the applied pressure is preferably 4.90 × 10 5 to 9.81 × 10 6 Pa (4 to 100 kgf / cm 2 ). It is more preferably 9.81 × 10 5 to 9.81 × 10 6 Pa (10 to 100 kgf / cm 2 ).
Moreover, it is preferable that the pressurization time in the production of the laminated electrical steel sheet of the present invention is in the range of 10 to 10,000 seconds.
以下に、実施例を示して本発明を具体的に説明するが、本発明はこれらに限られるものではない。
幅：200mm、長さ：300mmおよび板厚：O.05〜O.50mmの電磁鋼板(電気鉄板)に、表１に示すような各種ベースとなる被膜を形成するマトリックス樹脂と粒状樹脂を所定の含有量で含有した各種の水系の接着性樹脂をロールコーターで塗布し、ついで、到達板温：260℃で焼付け、放冷して、種々の被膜付着量の絶縁被膜を、片方の表面に有した絶縁被膜付き電磁鋼板を得た。
粒状樹脂の平均粒径は、走査型電子顕微鏡（ＳＥＭ）を用いて、粒状樹脂単体を観察する方法により求めた。具体的には、任意の３視野について約500〜10000倍のＳＥＭ観察し、各視野の平均値を求め、それらの平均値を平均粒径とした。また、被膜付着量はアルカリ剥離または溶剤剥離による重量減少から求めた。
EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
Specified matrix resin and granular resin for forming various base films as shown in Table 1 are provided on electromagnetic steel plates (electric iron plates) of width: 200 mm, length: 300 mm and plate thickness: O.05 to O.50 mm. Apply various water-based adhesive resins contained in the content with a roll coater, then bake at a final plate temperature of 260 ° C and allow to cool, so that the insulation coating with various coating amounts is on one surface. A magnetic steel sheet with an insulating coating was obtained.
The average particle diameter of the granular resin was determined by a method of observing the granular resin alone using a scanning electron microscope (SEM). Specifically, about 500 to 10,000 times of SEM observation was performed for three arbitrary visual fields, the average value of each visual field was determined, and the average value was defined as the average particle diameter. Further, the coating amount was determined from the weight reduction due to alkali peeling or solvent peeling.
上記の絶縁被膜付き電磁鋼板について、以下の評価を行った。
(1)接着強度
２枚の絶縁被膜付き電磁鋼板(幅：20mm×長さ：70mm)を、先端から10mmまでの部分のみで絶縁被膜同士が接着するように、ずらして積層 (ラップ部分、幅：20mm×長さ：10mm) し、ホットプレスを用いて、温度：200℃、圧力：9.81×105Paおよび時間：１分の各条件で加熱加圧して接着し、接着強度測定用の試験片を得た。この試験片を用い、引張速度：３mm/minの条件で室温（23℃）にて引張試験を行い、破断したときの最大応力を求めて接着強度を評価した。
The following evaluation was performed about said electromagnetic steel plate with an insulation film.
(1) Adhesive strength Laminate two laminated steel sheets with insulation coating (width: 20 mm x length: 70 mm) so that the insulation coating adheres only at the portion from the tip to 10 mm (lap portion, width) : 20mm x length: 10mm) Using a hot press, temperature: 200 ° C, pressure: 9.81 x 10 5 Pa and time: 1 minute for heating and pressurizing and bonding, test for adhesive strength measurement I got a piece. Using this test piece, a tensile test was performed at room temperature (23 ° C.) under the condition of a tensile speed of 3 mm / min, and the maximum stress when it was broken was determined to evaluate the adhesive strength.
(2)鉄心占積率
上述した接着強度の評価方法と同様に鋼板を接着した後、JIS C 2550：2000に準拠して、鉄心占積率を測定した。なお、板厚：O.23mm未満の鋼板の場合、鉄心占積率を求めるための組み立てるに要する鋼板の枚数について、JIS規格に規定がないため、本試験では36枚の鋼板を積層して試験を実施した。
(2) Iron core space factor The steel sheet space factor was measured in accordance with JIS C 2550: 2000 after the steel sheets were bonded in the same manner as the above-described method for evaluating the adhesive strength. In the case of steel sheets with a thickness of less than O.23 mm, the number of steel sheets required for assembling to determine the core space factor is not stipulated in the JIS standard. Carried out.
(3)粉吹き性
試験条件として、フェルト接触面の幅：1Omm×長さ：1Omm、荷重：4.90×104Pa、被膜表面を100回単純往復を採用した。往復試験後の擦り跡を目視観察して、被膜の剥離状態および粉吹き状態を目視評価した。評価基準は以下のとおりである。
(評価基準)
○: 被膜残存率80％以上
△: 被膜残存率50％以上80％未満
×: 被膜残存率50％未満
(3) Powder blowing property As test conditions, the width of the felt contact surface: 1 Omm × length: 1Omm, load: 4.90 × 10 4 Pa, and simple reciprocation of the coating surface 100 times were adopted. The rubbing trace after the reciprocating test was visually observed to visually evaluate the peeled state and the powder blowing state of the coating. The evaluation criteria are as follows.
(Evaluation criteria)
○: Remaining film ratio 80% or more △: Remaining film ratio 50% or more and less than 80% ×: Remaining film ratio less than 50%
(4) 熱伝導率
鋼板３枚を積層し、積層方向の圧力を0.6MPaとしたときの熱伝導率を温度傾斜法で測定した。
◎：2.0 W/(m・K)超え
○：1.5以上、2.0 W/(m・K)以下
△：1.0以上、1.5 W/(m・K)未満
×：1.0 W/(m・K)未満
(4) Thermal conductivity Three steel plates were laminated, and the thermal conductivity when the pressure in the lamination direction was 0.6 MPa was measured by a temperature gradient method.
◎: Over 2.0 W / (m · K) ○: 1.5 or more, 2.0 W / (m · K) or less △: 1.0 or more, less than 1.5 W / (m · K) ×: Less than 1.0 W / (m · K)
同表に示したとおり、本発明に従う発明例は、そのいずれもが高い接着強度、熱伝導率および鉄心占積率となり、粉吹き性についても良好な結果となっている。
これに対し、試験Ｎｏ．１は、粒状樹脂の粒径が本発明の範囲より小さく、試験Ｎｏ．１１は、粒状樹脂の含有量が本発明の範囲より小さいため、接着強度に劣り、また、試験Ｎｏ．１０は、粒状樹脂の粒径が本発明の範囲より大きく、試験Ｎｏ．２０〜２２は、粒状樹脂の含有量が本発明の範囲より大きいため、粉吹き性に劣っていた。さらに、試験Ｎｏ．２９〜３１は、絶縁被膜の付着量が多く、鉄心占積率が本発明の範囲に満たないため、熱伝導率に劣っていた。
As shown in the table, all of the inventive examples according to the present invention have high adhesive strength, thermal conductivity, and iron core space factor, and the powder blowing property is also good.
In contrast, test no. No. 1 has a particle size of the granular resin smaller than the range of the present invention. No. 11 is inferior in adhesive strength because the content of the granular resin is smaller than the range of the present invention. No. 10 has a particle size of the granular resin larger than the range of the present invention. Nos. 20 to 22 were inferior in powder sprayability because the content of the granular resin was larger than the range of the present invention. Furthermore, test no. Nos. 29 to 31 were inferior in thermal conductivity because the amount of insulating coating adhered was large and the iron core space factor was less than the range of the present invention.
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