JP5915075B2 - Manufacturing method of laminated core - Google Patents
Manufacturing method of laminated core Download PDFInfo
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- JP5915075B2 JP5915075B2 JP2011231228A JP2011231228A JP5915075B2 JP 5915075 B2 JP5915075 B2 JP 5915075B2 JP 2011231228 A JP2011231228 A JP 2011231228A JP 2011231228 A JP2011231228 A JP 2011231228A JP 5915075 B2 JP5915075 B2 JP 5915075B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000000853 adhesive Substances 0.000 claims description 157
- 230000001070 adhesive effect Effects 0.000 claims description 156
- 239000011162 core material Substances 0.000 claims description 97
- 229920001187 thermosetting polymer Polymers 0.000 claims description 51
- 238000010438 heat treatment Methods 0.000 claims description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000004080 punching Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 description 19
- 230000007246 mechanism Effects 0.000 description 18
- 238000001723 curing Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 5
- 238000000576 coating method Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 229920001651 Cyanoacrylate Polymers 0.000 description 2
- MWCLLHOVUTZFKS-UHFFFAOYSA-N Methyl cyanoacrylate Chemical compound COC(=O)C(=C)C#N MWCLLHOVUTZFKS-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000010062 adhesion mechanism Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Description
本発明は、磁性材料である薄鋼板を用いた積層コアの製造方法に関するものである。 The present invention relates to a method of manufacturing a laminated core using a thin steel plate that is a magnetic material.
従来、電気機器などの鉄心となる積層コアの製造方法として、薄鋼板から打ち抜き加工された複数枚のコア材を積層させ、且つ隣接するコア材どうしを部分的に塗布された瞬間接着剤により仮接着して積層体とした後、この積層体に樹脂を含浸させ、次いで、積層体を焼付処理して含浸させた樹脂を硬化させる方法が知られている（例えば、特許文献１）。
この製造方法によれば、接着剤（瞬間接着剤）によりコア材どうしを部分的に仮接着して積層体を得る工程と、この積層体に樹脂含浸及び焼付処理を施す工程を組み合わせることにより、積層コアを効率的に製造することができる。
Conventionally, as a method of manufacturing a laminated core that becomes an iron core of an electrical device or the like, a temporary adhesive is applied by laminating a plurality of core materials punched from a thin steel plate and partially coating adjacent core materials. A method is known in which, after bonding to form a laminate, the laminate is impregnated with a resin, and then the laminate is baked to cure the impregnated resin (for example, Patent Document 1).
According to this manufacturing method, by combining the step of temporarily bonding the core materials with an adhesive (instant adhesive) to obtain a laminate, and the step of subjecting the laminate to resin impregnation and baking treatment, A laminated core can be manufactured efficiently.
しかし、このような従来技術の製造方法では、積層体に含浸させた樹脂の焼付温度が瞬間接着剤の耐熱温度よりも高いため、積層体を通常の焼付温度で加熱すると、この焼付処理の途中で瞬間接着剤が強度劣化して積層体の寸法が崩れてしまい、製品の寸法精度が低下してしまう問題を生じる。このような問題を回避するには、積層体を治具で固定した状態で焼付処理する必要あるが、その治具の取り付け・取り外しのために生産性が大きく低下するという新たな問題が生じてしまう。また、繰り返し使用する治具の清掃が不可欠であるとともに、完全には清掃しきれないために、治具起因による製品の寸法不良が生じることもある。 However, in such a conventional manufacturing method, since the baking temperature of the resin impregnated in the laminate is higher than the heat resistance temperature of the instantaneous adhesive, when the laminate is heated at a normal baking temperature, As a result, the strength of the instantaneous adhesive deteriorates, the dimensions of the laminate collapse, and the dimensional accuracy of the product decreases. In order to avoid such a problem, it is necessary to perform the baking process in a state where the laminated body is fixed with a jig, but there is a new problem that productivity is greatly reduced due to attachment / detachment of the jig. End up. In addition, it is indispensable to clean the jig to be used repeatedly, and since it cannot be completely cleaned, there may be a case where the product is defective due to the jig.
したがって本発明の目的は、上記従来技術の課題を解決し、接着強度と寸法精度に優れた積層コアを効率的且つ安価に製造することができる積層コアの製造方法を提供することにある。 Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a method for producing a laminated core that can efficiently and inexpensively produce a laminated core having excellent adhesive strength and dimensional accuracy.
上記課題を解決するための本発明の要旨は以下のとおりである。
［1］薄鋼板から打ち抜き加工された複数枚のコア材が積層し、隣接するコア材間が部分的に塗布された瞬間接着剤（ｘ）により仮接着された積層体を得る工程（Ａ）と、該工程（Ａ）で得られた積層体に熱硬化型接着剤（ｙ）を含浸させる工程（Ｂ）と、該工程（Ｂ）で熱硬化型接着剤（ｙ）を含浸させた積層体を加熱し、熱硬化型接着剤（ｙ）を硬化させる工程（Ｃ）を有し、
前記工程（Ｃ）は、熱硬化型接着剤（ｙ）を瞬間接着剤（ｘ）の耐熱温度以下の加熱温度で仮硬化させる工程（Ｃ1）と、該工程（Ｃ1）に引き続き、工程（Ｃ1）での加熱温度よりも高い加熱温度で熱硬化型接着剤（ｙ）を本硬化させる工程（Ｃ2）を有し、
前記工程（Ｃ1）では、熱硬化型接着剤（ｙ）を８０℃以上で、且つ瞬間接着剤（ｘ）の接着強度が常温での接着強度の４０％以上に維持される加熱温度で３０分以上加熱することを特徴とする積層コアの製造方法。
The gist of the present invention for solving the above problems is as follows.
[1] A step of obtaining a laminate in which a plurality of core materials punched from a thin steel plate are laminated and temporarily bonded with an instantaneous adhesive (x) in which adjacent core materials are partially applied. And a step (B) of impregnating the laminate obtained in the step (A) with the thermosetting adhesive (y), and a laminate in which the thermosetting adhesive (y) is impregnated in the step (B). Heating the body and curing the thermosetting adhesive (y) (C),
The step (C) includes a step (C1) of temporarily curing the thermosetting adhesive (y) at a heating temperature equal to or lower than the heat resistant temperature of the instantaneous adhesive (x), and a step (C1) following the step (C1). A step (C2) of fully curing the thermosetting adhesive (y) at a heating temperature higher than the heating temperature in
In the step (C1), the thermosetting adhesive (y) is at 80 ° C. or higher and the heating temperature at which the adhesive strength of the instantaneous adhesive (x) is maintained at 40% or more of the adhesive strength at room temperature is 30 minutes. The manufacturing method of the laminated core characterized by heating above .
［2］上記［1］の製造方法において、工程（Ａ）では、コア材の打ち抜き加工前又は打ち抜き加工時に瞬間接着剤（ｘ）を塗布するとともに、打ち抜き加工された複数枚のコア材をそのまま順次積層させることで、隣接するコア材間が瞬間接着剤（ｘ）で仮接着された積層体を得ることを特徴とする積層コアの製造方法。
［3］上記［1］又は［2］の製造方法において、工程（Ａ）では、コア材の面積の
０．５〜８０％の範囲に瞬間接着剤（ｘ）を塗布することを特徴とする積層コアの製造方法。
[2] In the manufacturing method of [1] above, in the step (A), the instantaneous adhesive (x) is applied before or at the time of punching the core material, and a plurality of punched core materials are left as they are. A method for producing a laminated core, characterized in that a laminated body in which adjacent core materials are temporarily bonded with an instantaneous adhesive (x) is obtained by sequentially laminating.
[3] In the production method of [1] or [2] above, in the step (A), the instantaneous adhesive (x) is applied in a range of 0.5 to 80% of the area of the core material. Manufacturing method of laminated core .
本発明によれば、瞬間接着剤（ｘ）によりコア材どうしを部分的に仮接着した積層体に熱硬化型接着剤（ｙ）を含浸させた後、積層体を加熱して熱硬化型接着剤（ｙ）を熱硬化させる際に、熱硬化型接着剤（ｙ）の熱硬化を２段階の加熱処理で行うことにより、治具を使用しなくても、加熱処理の途中で瞬間接着剤（ｘ）の強度劣化により積層体の寸法が崩れるようなことがなく、製品の高い寸法精度を確保することができる。このため、接着強度と寸法精度に優れた積層コアを効率的且つ安価に製造することができる。 According to the present invention, after the thermosetting adhesive (y) is impregnated into the laminate in which the core materials are partially temporarily bonded with the instantaneous adhesive (x), the laminate is heated to perform thermosetting adhesion. When heat-curing the agent (y), the thermosetting adhesive (y) is thermally cured by two-step heat treatment, so that an instantaneous adhesive can be used in the middle of the heat treatment without using a jig. The dimension of the laminate is not destroyed by the strength deterioration of (x), and high dimensional accuracy of the product can be ensured. For this reason, the laminated core excellent in adhesive strength and dimensional accuracy can be manufactured efficiently and inexpensively.
本発明の積層コアの製造方法は、打ち抜き加工で得られた複数枚のコア材が瞬間接着剤ｘで仮接着された積層体を得る工程（Ａ）と、この積層体に熱硬化型接着剤ｙを含浸させる工程（Ｂ）と、積層体を加熱して熱硬化型接着剤ｙを熱硬化させる工程（Ｃ）を有するが、この工程（Ｃ）を、比較的低い加熱温度で熱硬化型接着剤ｙを仮硬化させる工程（Ｃ1）と、それよりも高い加熱温度で熱硬化型接着剤ｙを本硬化させる工程（Ｃ2）の２段階で行うことが特徴である。 The method for producing a laminated core of the present invention comprises a step (A) of obtaining a laminate in which a plurality of core materials obtained by punching are temporarily bonded with an instantaneous adhesive x, and a thermosetting adhesive on the laminate. the step (B) of impregnating y and the step (C) of heating the thermosetting adhesive y by heating the laminate, and this step (C) is thermosetting at a relatively low heating temperature. It is characterized in that it is carried out in two stages: a step (C1) for pre-curing the adhesive y and a step (C2) for main-curing the thermosetting adhesive y at a higher heating temperature.
ここで、接着剤による積層体の固定（コア材どうしの接着）を瞬間接着剤ｘだけでできない理由は、一般に瞬間接着剤の耐熱温度（所定の接着強度を維持できる温度）が１２０℃程度であるのに対し、例えば、自動車用リアクトル等に使用する積層コアに要求される耐熱温度はそれよりも高く、瞬間接着剤では耐用できないからである。
コア材を構成する薄鋼板の種類や組成に特に制限はなく、例えば、Ｓｉ含有量が３．５mass％以上の高珪素鋼板や非晶質薄鋼板などを用いることができる。また、薄鋼板の板厚にも特別な制限はないが、一般には０．２ｍｍ以下のものが好ましい。
Here, the reason why the laminated body cannot be fixed with the adhesive (adhesion between the core materials) with the instantaneous adhesive x alone is that the heat resistance temperature of the instantaneous adhesive (the temperature at which the predetermined adhesive strength can be maintained) is generally about 120 ° C. On the other hand, for example, the heat-resistant temperature required for a laminated core used for an automobile reactor or the like is higher than that and cannot be used with an instantaneous adhesive.
There is no restriction | limiting in particular in the kind and composition of the thin steel plate which comprises a core material, For example, a high silicon steel plate, an amorphous thin steel plate, etc. whose Si content is 3.5 mass% or more can be used. Moreover, although there is no special restriction | limiting also in the plate | board thickness of a thin steel plate, Generally 0.2 mm or less is preferable.
まず、工程（Ａ）では、薄鋼板から打ち抜き加工された複数枚のコア材が積層し、隣接するコア材間が部分的に塗布された瞬間接着剤ｘにより仮接着された積層体を得る。
この工程（Ａ）では、コア材を得るための打ち抜き加工と、コア材に対する瞬間接着剤ｘの塗布及びコア材どうしの接着を行う工程をオフラインで行ってもよいが、オンラインで薄鋼帯からコア材を順次打ち抜き加工し、打ち抜き加工されたコア材が順に積層する一連の工程内で、コア材に対する瞬間接着剤ｘの塗布及びコア材どうしの接着を行うことが好ましい。すなわち、工程（Ａ）において、コア材を得るための打ち抜き加工前又は打ち抜き加工時に瞬間接着剤ｘを塗布するとともに、打ち抜き加工された複数枚のコア材をそのまま順次積層させることで、隣接するコア材間が瞬間接着剤ｘで仮接着された積層体を得るようにするものである。その場合、工程（Ａ）は、例えば、薄鋼板にコア材外周以外の打ち抜き加工を施す打ち抜き工程（Ａ1）と、コア材となる薄鋼板部分に部分的に瞬間接着剤ｘを塗布する接着剤塗布工程（Ａ2）と、薄鋼板にコア材外周の打ち抜き加工を施す打ち抜き工程（Ａ3）と、打ち抜かれたコア材を積層させてコア材どうしを前記瞬間接着剤ｘで接着するコア材積層・接着工程（Ａ4）とを有する。また、接着剤塗布工程（Ａ2）と打ち抜き工程（Ａ3）が同時に行われるようにしてもよい。さらに、例えば特許文献１に示されるように、帯状の複数枚の薄鋼板を積層させ、且つこの複数枚の薄鋼板間を瞬間接着剤ｘで部分的に接着することにより積層コア用帯材を形成し、この積層コア用帯材の下面又は上面に部分的に瞬間接着剤ｘを塗布した後又は塗布と同時に、打ち抜き加工を行い、この打ち抜かれた積層コア用材料（＝複数枚のコア材が瞬間接着剤ｘで接着された材料）を打ち抜き装置内で順次積層させることにより積層体を得るようにしてもよい。この工程（Ａ）の一実施形態については後に説明する。
First, in the step (A), a plurality of core materials punched from a thin steel plate are laminated, and a laminated body temporarily bonded with an instantaneous adhesive x in which adjacent core materials are partially applied is obtained.
In this step (A), the punching process for obtaining the core material, the application of the instantaneous adhesive x to the core material and the bonding of the core materials may be performed off-line. It is preferable to apply the instantaneous adhesive x to the core material and bond the core materials to each other in a series of processes in which the core material is sequentially punched and the core materials thus punched are sequentially stacked. That is, in the step (A), before the punching process for obtaining the core material or at the time of the punching process, the instantaneous adhesive x is applied, and a plurality of punched core materials are sequentially laminated as they are so that the adjacent cores are laminated. A laminate in which the material is temporarily bonded with the instantaneous adhesive x is obtained. In that case, the process (A) includes, for example, a punching process (A1) in which a thin steel sheet is subjected to a punching process other than the outer periphery of the core material, and an adhesive that partially applies the instantaneous adhesive x to the thin steel sheet portion to be the core material. The coating process (A2), the punching process (A3) for punching the outer periphery of the core material on the thin steel sheet, and the core material lamination, in which the punched core material is laminated and the core materials are bonded with the instantaneous adhesive x Bonding step (A4). Further, the adhesive application step (A2) and the punching step (A3) may be performed simultaneously. Further, for example, as shown in Patent Document 1, a plurality of strip-shaped thin steel plates are laminated, and the plurality of thin steel plates are partially bonded with an instantaneous adhesive x to obtain a laminated core belt material. After forming and partially applying the instantaneous adhesive x to the lower surface or upper surface of the laminated core strip, punching is performed, and this laminated core material (= multiple core materials) is punched out. May be obtained by sequentially laminating the material bonded with the instantaneous adhesive x in the punching apparatus. One embodiment of this step (A) will be described later.
本発明で使用する瞬間接着剤ｘは、常温雰囲気において使用した場合に接着強度（引張せん断接着強さ）５Ｎ／ｍｍ２以上になるまでの時間が６０秒以内の接着剤であると定義する。接着剤が塗布されたコア材を順次積層させ、コア材どうしを接着させる場合、接着剤が硬化するまでの時間が長いと積層コア寸法に変化が生じるおそれがあるため、接着硬化時間は短い方がよい。この点、瞬間接着剤ｘを使用するとコア材どうしが瞬時に接着されるので、プレス精度がより良く反映できる。
瞬間接着剤ｘの種類は特に限定されないが、例えば、シアノアクリレート系などの瞬間接着剤が挙げられる。通常、瞬間接着剤ｘの耐熱温度は１２０℃程度である。
The instant adhesive x used in the present invention is defined as an adhesive having a time required to reach an adhesive strength (tensile shear adhesive strength) of 5 N / mm 2 or more when used in a normal temperature atmosphere within 60 seconds. When laminating core materials coated with adhesive in order and bonding the core materials together, the longer the time it takes for the adhesive to cure, there is a risk of changes in the laminated core dimensions. Is good. In this regard, when the instantaneous adhesive x is used, the core materials are bonded instantaneously, so that the press accuracy can be better reflected.
The type of the instantaneous adhesive x is not particularly limited, and examples thereof include a cyanoacrylate-based instantaneous adhesive. Usually, the heat resistant temperature of the instantaneous adhesive x is about 120 ° C.
瞬間接着剤ｘの塗布面積は、コア材の面積全体の０．５〜８０％程度が適当である。瞬間接着剤ｘの塗布面積がコア材の面積全体の０．５％未満では十分な接着強度が得られないおそれがあり、一方、８０％を超えると工程（Ｂ）で含浸させる熱硬化型接着剤ｙによる接着面積が不足し、製品の接着強度が不十分になるおそれがある。なお、瞬間接着剤ｘは熱硬化型接着剤ｙに較べて安価であるので、塗布面積を上記の範囲で比較的広くすることにより、製造コストを低く抑えることができる。 The application area of the instantaneous adhesive x is suitably about 0.5 to 80% of the entire area of the core material. If the application area of the instantaneous adhesive x is less than 0.5% of the total area of the core material, sufficient adhesive strength may not be obtained. On the other hand, if it exceeds 80%, the thermosetting adhesive impregnated in step (B) There is a risk that the adhesive area of the agent y will be insufficient and the adhesive strength of the product will be insufficient. Since the instantaneous adhesive x is less expensive than the thermosetting adhesive y, the manufacturing cost can be kept low by making the coating area relatively wide in the above range.
また、工程（Ｂ）における熱硬化型接着剤ｙの含浸を妨げないようにするために、コア材の外縁部に相当する部分には、瞬間接着剤ｘは塗布しないことが望ましい。また、瞬間接着剤ｘによる接着剤層が、この接着剤層に囲まれた非接着領域が存在しないように形成されることが好ましい。これにより、工程（Ｂ）の熱硬化型樹脂の含浸において、瞬間接着剤ｘによる接着剤層を除くコア材間全体に熱硬化型接着剤ｙを浸透させることができる。 In order not to prevent impregnation of the thermosetting adhesive y in the step (B), it is desirable not to apply the instantaneous adhesive x to the portion corresponding to the outer edge portion of the core material. Further, it is preferable that the adhesive layer made of the instantaneous adhesive x is formed so that there is no non-adhesive region surrounded by the adhesive layer. Thereby, in the impregnation of the thermosetting resin in the step (B), the thermosetting adhesive y can be infiltrated into the entire core material excluding the adhesive layer by the instantaneous adhesive x.
次の工程（Ｂ）では、前記工程（Ａ）で得られた積層体に熱硬化型接着剤ｙを含浸させる。熱硬化型接着剤ｙとしては、例えば、アクリル系熱硬化型接着剤、エポキシ系接着剤などを使用できる。
積層体に熱硬化型接着剤ｙを含浸させる方法としては、（i）真空含浸する方法、（ii）ドブ付け（浸漬）する方法、（iii）スポイト管等で樹脂を供給する方法等があるが、いずれを用いてもよい。
次の工程（Ｃ）では、前記工程（Ｂ）で熱硬化型接着剤ｙを含浸させた積層体を加熱（焼付）し、熱硬化型接着剤ｙを硬化させるが、この工程（Ｃ）は、熱硬化型接着剤ｙを瞬間接着剤ｘの耐熱温度以下の加熱温度で仮硬化させる工程（Ｃ1）と、この工程（Ｃ1）に引き続き、工程（Ｃ1）での加熱温度よりも高い加熱温度で熱硬化型接着剤ｙを本硬化させる工程（Ｃ2）の２段階で行う。
In the next step (B), the laminate obtained in the step (A) is impregnated with the thermosetting adhesive y. As the thermosetting adhesive y, for example, an acrylic thermosetting adhesive or an epoxy adhesive can be used.
As a method of impregnating the laminate with the thermosetting adhesive y, there are (i) a method of vacuum impregnation, (ii) a method of dipping (immersing), (iii) a method of supplying a resin through a dropper tube, and the like. Any of these may be used.
In the next step (C), the laminate impregnated with the thermosetting adhesive y in the step (B) is heated (baked) to cure the thermosetting adhesive y. This step (C) The step (C1) of temporarily curing the thermosetting adhesive y at a heating temperature lower than the heat resistance temperature of the instantaneous adhesive x, and the heating temperature higher than the heating temperature in the step (C1) following this step (C1) In step (C2) of the main curing of the thermosetting adhesive y.
このように熱硬化型接着剤ｙの加熱硬化を２段階で行うのは、瞬間接着剤ｘの耐熱温度は熱硬化型接着剤ｙを本硬化（完全硬化）させるための加熱温度よりも低いため、熱硬化型接着剤ｙをその本硬化に必要な加熱温度で最初から加熱すると、瞬間接着剤ｘの接着強度が著しく低下し、コア材の仮接着状態が維持できなくなるためである。このため工程（Ｃ1）では、瞬間接着剤ｘの接着強度が大きく低下しない加熱温度で熱硬化型接着剤ｙを仮硬化（半硬化）させることで、瞬間接着剤ｘと熱硬化型接着剤ｙの両方で積層体の接着強度を維持させ、引き続き工程（Ｃ2）において、所定の加熱温度で熱硬化型接着剤ｙを本硬化（完全硬化）させるものである。
このように熱硬化型接着剤ｙの熱硬化を２段階で行うことにより、治具を使用しなくても、加熱処理の途中で瞬間接着剤の強度劣化により積層体の寸法が崩れるようなことがなく、製品の高い寸法精度を確保することができる。
Thus, the heat curing of the thermosetting adhesive y is performed in two stages because the heat resistant temperature of the instantaneous adhesive x is lower than the heating temperature for main curing (complete curing) of the thermosetting adhesive y. This is because, when the thermosetting adhesive y is heated from the beginning at the heating temperature necessary for the main curing, the adhesive strength of the instantaneous adhesive x is remarkably lowered, and the temporarily bonded state of the core material cannot be maintained. Therefore, in the step (C1), the instantaneous adhesive x and the thermosetting adhesive y are preliminarily cured (semi-cured) at a heating temperature at which the adhesive strength of the instantaneous adhesive x is not significantly reduced. In both cases, the adhesive strength of the laminate is maintained, and subsequently, in step (C2), the thermosetting adhesive y is fully cured (completely cured) at a predetermined heating temperature.
In this way, the thermosetting of the thermosetting adhesive y is performed in two stages, so that the dimensions of the laminate collapse due to the strength deterioration of the instantaneous adhesive during the heat treatment without using a jig. And high dimensional accuracy of the product can be ensured.
工程（Ｃ1）では、熱硬化型接着剤ｙを瞬間接着剤ｘの耐熱温度以下の温度で加熱することにより、熱硬化型接着剤ｙの硬化反応の一部が生じ、熱硬化型接着剤ｙの接着強度が一部発現する状態とする。具体的には、熱硬化型接着剤ｙを８０℃以上で、且つ瞬間接着剤ｘの接着強度が常温での接着強度の４０％以上に維持される加熱温度で加熱することが好ましい。熱硬化型接着剤ｙをある程度の接着強度が発現するように硬化させるには、上記のように８０℃以上（好ましくは９０℃以上）で加熱することが望ましい。一方、瞬間接着剤ｘの接着強度が常温での接着強度の４０％以上に維持されれば、加熱処理の途中で瞬間接着剤の強度劣化により積層体の寸法が崩れる恐れはほとんどない。一般的な瞬間接着剤ｘの耐熱温度は１２０℃前後であるので、瞬間接着剤ｘの接着強度を上記の範囲に維持するには、加熱温度は１２０℃以下、好ましくは１１０℃以下が望ましい。
また、工程（Ｃ1）における上記加熱温度での加熱時間は、３０分以上、特に６０分以上が好ましく、通常は３０分〜９０分程度である。
In the step (C1), by heating the thermosetting adhesive y at a temperature lower than the heat resistant temperature of the instantaneous adhesive x, a part of the curing reaction of the thermosetting adhesive y occurs, and the thermosetting adhesive y In this state, the adhesive strength is partially expressed. Specifically, it is preferable to heat the thermosetting adhesive y at 80 ° C. or higher and a heating temperature at which the adhesive strength of the instantaneous adhesive x is maintained at 40% or more of the adhesive strength at normal temperature. In order to cure the thermosetting adhesive y so as to exhibit a certain degree of adhesive strength, it is desirable to heat at 80 ° C. or higher (preferably 90 ° C. or higher) as described above. On the other hand, if the adhesive strength of the instantaneous adhesive x is maintained at 40% or more of the adhesive strength at normal temperature, there is almost no possibility that the dimensions of the laminate are collapsed due to the strength deterioration of the instantaneous adhesive during the heat treatment. Since the heat resistance temperature of a general instant adhesive x is around 120 ° C., the heating temperature is preferably 120 ° C. or less, preferably 110 ° C. or less in order to maintain the adhesive strength of the instant adhesive x in the above range.
In addition, the heating time at the above heating temperature in the step (C1) is preferably 30 minutes or more, particularly preferably 60 minutes or more, and usually about 30 minutes to 90 minutes.
工程（Ｃ2）では、前記工程（Ｃ1）に引き続き、熱硬化型接着剤ｙの本硬化に必要な温度まで昇温し、本硬化のための加熱処理を行う。一般の熱硬化型接着剤ｙの加熱（焼付）温度は１５０℃以上であるので、そのような熱硬化型接着剤ｙを用いる場合には、工程（Ｃ2）では、熱硬化型接着剤ｙを１５０℃以上、好ましくは１７０℃以上の加熱温度で本硬化（完全硬化）させる。また、この工程（Ｃ2）の上記加熱温度での加熱時間は３０〜９０分程度が適当である。
工程（Ｃ）での加熱処理は、例えば電気炉、熱風乾燥炉、誘導加熱炉等を用いることができる。
In the step (C2), following the step (C1), the temperature is raised to a temperature necessary for the main curing of the thermosetting adhesive y, and a heat treatment for the main curing is performed. Since the heating (baking) temperature of a general thermosetting adhesive y is 150 ° C. or higher, when such a thermosetting adhesive y is used, in step (C2), the thermosetting adhesive y is used. The main curing (complete curing) is performed at a heating temperature of 150 ° C. or higher, preferably 170 ° C. or higher. In addition, the heating time at the above heating temperature in this step (C2) is suitably about 30 to 90 minutes.
For the heat treatment in the step (C), for example, an electric furnace, a hot air drying furnace, an induction heating furnace, or the like can be used.
図１は、工程（Ａ）の一実施形態を示すもので、図１（ア）は工程（Ａ）を構成する各工程での薄鋼板の加工・処理状況を示す説明図、図１（イ）は積層体の製造装置の断面を示す説明図である。
この積層体の製造装置は、装置本体ａが上下金型１，２で構成され、上金型１が打抜パンチを備える可動金型、下金型２がダイを備える固定金型となっている。上金型１は、図示しない油圧式駆動機構などにより上下動する。
FIG. 1 shows one embodiment of the step (A). FIG. 1A is an explanatory view showing the processing / processing status of a thin steel plate in each step constituting the step (A). () Is explanatory drawing which shows the cross section of the manufacturing apparatus of a laminated body.
In this laminate manufacturing apparatus, the apparatus body a is composed of upper and lower molds 1 and 2, the upper mold 1 is a movable mold having a punch, and the lower mold 2 is a fixed mold having a die. Yes. The upper mold 1 moves up and down by a hydraulic drive mechanism (not shown).
このような上下金型１，２からなる装置本体ａは、鋼板送り方向の上流側から、薄鋼板ｓにコア材外周以外の打ち抜き加工を施す打ち抜き機構部３と、薄鋼板ｓにコア材外周の打ち抜き加工を施す外周打ち抜き機構部４を備えるとともに、打ち抜き機構部３と外周打ち抜き機構部４との間には、コア材となる薄鋼板部分に瞬間接着剤を塗布する接着剤塗布機構部５を備えている。また、装置本体ａの入側には、帯状の薄鋼板ｓを装置本体ａ内に順送りするための材料送り機構ｂ（送りロール）が設けられている。
The apparatus main body a composed of such upper and lower molds 1 and 2 includes a
図１の製造装置において、薄鋼板ｓの打ち抜き、瞬間接着剤ｘの塗布は、上金型１（可動金型）が下金型２に対して下降することによりなされる。また、薄鋼板ｓは、材料送り機構ｂにより装置本体ａ内に送り込まれるとともに、各工程に対して順送りされる。図において、７は板状のストリッパ（板押さえ）であり、打ち抜き加工する際に薄鋼板ｓを下金型２に対して押さえるための手段である。このストリッパ７は、パンチ３０、接着剤吐出部５０およびパンチ４０を、それぞれ挿通させる挿通孔７０，７１，７２を有している。
In the manufacturing apparatus of FIG. 1, the thin steel plate s is punched and the instantaneous adhesive x is applied by lowering the upper mold 1 (movable mold) with respect to the lower mold 2. Further, the thin steel sheet s is fed into the apparatus main body a by the material feeding mechanism b and is sequentially fed to each process. In the figure, reference numeral 7 denotes a plate-like stripper (plate presser), which is a means for pressing the thin steel plate s against the lower mold 2 when punching. The stripper 7 has insertion holes 70, 71, 72 through which the
装置本体ａ内に送り込まれた薄鋼板ｓには、まず、打ち抜き機構部３において、パンチ３０とダイ３１によりコア材外周以外（本実施形態ではコア材内周）の打ち抜き加工が施される。ここで行われる加工は、コア材内周やティースなどの打ち抜き加工である。なお、このようなコア材外周以外の打ち抜き加工は複数の工程で行われる場合があり、その場合には、複数の工程毎に打ち抜き機構部３が設けられ、薄鋼板ｓが順送りされる。
The thin steel sheet s fed into the apparatus main body a is first punched in the
次いで、薄鋼板ｓは接着剤塗布機構部５に送られ、コア材となる薄鋼板部分の上面に接着剤吐出部５０によって瞬間接着剤ｘが部分的に塗布される。８は接着材供給部であり、接着剤吐出部５０に瞬間接着剤ｘを供給する。
次いで、薄鋼板ｓは外周打ち抜き機構部４に送られ、ここでパンチ４０とダイ４１によりコア材外周の打ち抜き加工が施され、コア材ｃが薄鋼板ｓから打ち抜かれる。打ち抜かれたコア材ｃは、ダイ４１の抜き孔４２内に積層し、この抜き孔４２内とその下方のコア材積層・接着機構部６において、積層したコア材ｃどうしが前記瞬間接着剤ｘで結合する。この際、パンチ４０により、打ち抜かれたコア材ｃをその下側のコア材ｃに対して押圧（加圧）し、接着性を高めるようにしてもよい。
Next, the thin steel sheet s is sent to the adhesive application mechanism unit 5, and the instantaneous adhesive x is partially applied by the
Next, the thin steel sheet s is sent to the outer peripheral punching mechanism 4 where punching of the outer periphery of the core material is performed by the
前記接着剤塗布機構部５では、積層コアの最上部のコア材ｃを構成する薄鋼板部分には瞬間接着剤ｘを塗布しないので、所定枚数のコア材ｃのみが瞬間接着剤ｘで一体に結合された積層コアｄが得られる。支持体６０は、抜き孔４２の下方で積層したコア材ｃおよび積層コアｄを支持し、打ち抜かれたコア材ｃが積層する毎に順次下降する。
In the adhesive application mechanism unit 5, since the instantaneous adhesive x is not applied to the thin steel plate portion constituting the uppermost core material c of the laminated core, only a predetermined number of core materials c are integrated with the instantaneous adhesive x. A bonded laminated core d is obtained. The
積層体の製造装置を用い、薄鋼帯（Ｓｉ含有量６．５mass％、板厚０．１ｍｍ）からコア材を打ち抜き加工して積層させ、３００枚のコア材からなる積層体を作成した。この際、コア材に打ち抜かれる薄鋼帯部分の片面には、シアノアクリレート系瞬間接着剤（耐熱温度：１２０℃、１００℃での接着強度：常温での接着強度の４０％）を部分的に塗布し（塗布面積：コア材面積の２０％）、隣接するコア材どうしが瞬間接着剤により仮接着された積層体を作成した。なお、接着強度は、引張試験による引張せん断接着強さを求めた。このようにして得られた積層体に真空含浸によりアクリル系熱硬化型接着剤（推奨硬化温度１５０℃以上）を含浸させた。次いで、熱硬化型接着剤を硬化させるため積層体を加熱（焼付）処理した。この加熱処理では、図２に示す熱サイクルで熱風炉を用いて積層体を加熱し、積層コア（製品）を得た。 Using a laminate manufacturing apparatus, a core material was punched and laminated from a thin steel strip (Si content 6.5 mass%, plate thickness 0.1 mm) to create a laminate composed of 300 core materials. At this time, a cyanoacrylate instant adhesive (heat-resistant temperature: 120 ° C., adhesive strength at 100 ° C .: 40% of adhesive strength at normal temperature) is partially applied to one side of the thin steel strip portion punched into the core material. Application was performed (application area: 20% of the core material area), and a laminated body in which adjacent core materials were temporarily bonded with an instantaneous adhesive was prepared. In addition, the adhesive strength calculated | required the tensile shearing adhesive strength by the tension test. The laminate thus obtained was impregnated with an acrylic thermosetting adhesive (recommended curing temperature of 150 ° C. or higher) by vacuum impregnation. Next, the laminate was heated (baked) to cure the thermosetting adhesive. In this heat treatment, the laminated body was heated using a hot stove in the heat cycle shown in FIG. 2 to obtain a laminated core (product).
表１は、本発明例及び比較例の加熱（焼付）条件、積厚、製品の評価を示したものである。ここで、表１の「積厚」とは、加熱前後でのコアの積厚変化を評価したものである。また、「製品不具合」に記載された“直角度”とは、板を積み上げた時に垂直に積み上がっているかどうかの指標であり、“湾曲発生”とは、加熱後、コアにうねりが発生している場合を指す。 Table 1 shows the heating (baking) conditions, the stack thickness, and the evaluation of the products of the inventive examples and the comparative examples. Here, the “stack thickness” in Table 1 is an evaluation of the change in the core stack thickness before and after heating. “Squareness” described in “Product defects” is an indicator of whether or not the plates are stacked vertically when stacked, and “curvature generation” refers to the occurrence of waviness in the core after heating. If you are.
１ 上金型
２ 下金型
３ 打ち抜き機構部
４ 外周打ち抜き機構部
５ 接着剤塗布機構部
６ コア材積層・接着機構部
７ ストリッパ
８ 接着剤供給部
３０，４０ パンチ
３１，４１ ダイ
４２ 抜き孔
５０ 接着剤吐出部
６０ 支持体
７０，７１，７２ 挿通孔
ａ 装置本体
ｂ 材料送り機構
ｓ 薄鋼板
ｃ コア材
ｄ 積層コア
ｘ 瞬間接着剤
DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 3 Punching mechanism part 4 Peripheral punching mechanism part 5 Adhesive application | coating mechanism part 6 Core material lamination | stacking / adhesion mechanism part 7
Claims (3)
前記工程（Ｃ）は、熱硬化型接着剤（ｙ）を瞬間接着剤（ｘ）の耐熱温度以下の加熱温度で仮硬化させる工程（Ｃ1）と、該工程（Ｃ1）に引き続き、工程（Ｃ1）での加熱温度よりも高い加熱温度で熱硬化型接着剤（ｙ）を本硬化させる工程（Ｃ2）を有し、
前記工程（Ｃ1）では、熱硬化型接着剤（ｙ）を８０℃以上で、且つ瞬間接着剤（ｘ）の接着強度が常温での接着強度の４０％以上に維持される加熱温度で３０分以上加熱することを特徴とする積層コアの製造方法。 A step (A) of obtaining a laminated body in which a plurality of core materials punched from a thin steel plate are laminated and temporarily bonded by an instantaneous adhesive (x) in which adjacent core materials are partially applied; and Step (B) of impregnating the laminate obtained in step (A) with thermosetting adhesive (y), and heating the laminate impregnated with thermosetting adhesive (y) in step (B) And a step (C) of curing the thermosetting adhesive (y),
The step (C) includes a step (C1) of temporarily curing the thermosetting adhesive (y) at a heating temperature equal to or lower than the heat resistant temperature of the instantaneous adhesive (x), and a step (C1) following the step (C1). A step (C2) of fully curing the thermosetting adhesive (y) at a heating temperature higher than the heating temperature in
In the step (C1), the thermosetting adhesive (y) is at 80 ° C. or higher and the heating temperature at which the adhesive strength of the instantaneous adhesive (x) is maintained at 40% or more of the adhesive strength at room temperature is 30 minutes. The manufacturing method of the laminated core characterized by heating above .
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| CN113489254A (en) * | 2021-06-29 | 2021-10-08 | 陕西航天时代导航设备有限公司 | KH-225 glue gluing process for stator punching sheet, gluing process and tool for gluing process |
| CN113707443B (en) * | 2021-08-23 | 2023-03-31 | 横店集团东磁股份有限公司 | Preparation method of nanocrystalline magnetic core and nanocrystalline magnetic core |
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| JPH0288684A (en) * | 1988-09-27 | 1990-03-28 | Nitto Denko Corp | Bonding and liquid adhesive used therefor |
| JP2000049026A (en) * | 1998-07-31 | 2000-02-18 | Toshiba Tec Corp | Electromagnetic apparatus |
| JP3771933B2 (en) * | 2002-03-08 | 2006-05-10 | Ｊｆｅスチール株式会社 | LAMINATED CORE MATERIAL AND METHOD FOR PRODUCING THE SAME |
| US7596856B2 (en) * | 2003-06-11 | 2009-10-06 | Light Engineering, Inc. | Method for manufacturing a soft magnetic metal electromagnetic component |
| JP2005019641A (en) * | 2003-06-25 | 2005-01-20 | Jfe Steel Kk | Laminated core excellent in dimensional accuracy and its manufacturing method |
| JP4692305B2 (en) * | 2006-01-31 | 2011-06-01 | 株式会社デンソー | Manufacturing method of laminated core |
| JP2008061467A (en) * | 2006-09-04 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Manufacturing method for stator |
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