JP2018003039A - Aluminum alloy foil and manufacturing method therefor, and aluminum alloy foil molding container - Google Patents
Aluminum alloy foil and manufacturing method therefor, and aluminum alloy foil molding container Download PDFInfo
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- 239000011888 foil Substances 0.000 title claims abstract description 70
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 50
- 238000000465 moulding Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims description 17
- 238000010411 cooking Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000002845 discoloration Methods 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000000265 homogenisation Methods 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
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Abstract
Description
この発明は、アルミニウム合金箔およびその製造方法、ならびにアルミニウム合金箔成形容器に関する。 The present invention relates to an aluminum alloy foil, a method for producing the same, and an aluminum alloy foil molded container.
アルミニウム合金箔は成形性や熱伝導性に優れ、かつ軽量であることから、麺類や鍋物等の加熱食品用の容器として広く用いられている。加熱食品用の容器としては、ガスコンロでの直火による加熱の他に、最近では、電磁調理器を用いた加熱も行うことが要望されている。
しかし、一般に、アルミニウム箔は電気抵抗が小さく、電磁調理では加熱効率が悪い。このため、例えば、特許文献１や特許文献２では、アルミニウム箔の電気抵抗を上げるため、アルミニウム箔にＭｇ等の微量元素を含有させている。
Aluminum alloy foil is widely used as a container for heated foods such as noodles and pots because it is excellent in formability and thermal conductivity and is lightweight. As a container for heated food, in addition to heating by direct fire in a gas stove, recently, heating using an electromagnetic cooker has been demanded.
However, in general, aluminum foil has a small electric resistance, and heating efficiency is poor in electromagnetic cooking. For this reason, for example, in patent document 1 and patent document 2, in order to raise the electrical resistance of aluminum foil, trace elements, such as Mg, are contained in aluminum foil.
また、上記したアルミニウム箔は成形して容器形状とするが、加工を容易に行えるようにアルミニウム箔を軟質箔とする熱処理が行われている。
しかし、Ｍｇを添加したアルミニウム箔で高温の熱処理を行うと箔表面に変色が生じてしまい、製品品質を低下させる。
Moreover, although the above-mentioned aluminum foil is shape | molded and made into a container shape, the heat processing which uses aluminum foil as a soft foil is performed so that a process can be performed easily.
However, when high-temperature heat treatment is performed with an aluminum foil to which Mg is added, discoloration occurs on the foil surface, and the product quality is degraded.
本発明は上記事情を背景としてなされたものであり、Ｍｇ含有においても加熱処理による変色発生が抑制されたアルミニウム合金箔およびアルミニウム合金箔成形容器を提供することを目的とする。 The present invention has been made against the background of the above circumstances, and an object thereof is to provide an aluminum alloy foil and an aluminum alloy foil molded container in which the occurrence of discoloration due to heat treatment is suppressed even when Mg is contained.
すなわち、第１の本発明のアルミニウム合金箔のうち、第１の形態は、Ｍｇ：２．０〜４．０ｗｔ％、Ｃｒ：０．１ｗｔ％以下を含有し、残部がＡｌと不可避不純物からなる組成を有することを特徴とする。 That is, among the aluminum alloy foils according to the first aspect of the present invention, the first form contains Mg: 2.0 to 4.0 wt%, Cr: 0.1 wt% or less, and the balance is made of Al and inevitable impurities. It has a composition.
他の形態のアルミニウム合金箔は、前記形態の本発明において、箔厚が６５〜１００μｍであることを特徴とする。 Another form of the aluminum alloy foil is characterized in that, in the present invention of the above form, the foil thickness is 65 to 100 μm.
本発明のアルミニウム合金箔の製造方法は、Ｍｇ：２．０〜４．０ｗｔ％、Ｃｒ：０．１ｗｔ％以下を含有し、残部がＡｌと不可避不純物からなるアルミニウム合金鋳塊を、熱間圧延、冷間圧延、また必要に応じ冷間圧延の途中に中間焼鈍を施し、最終的に６５〜１００μｍの箔とした後、２７０℃〜３３０℃の最終焼鈍を行なうことを特徴とする。 The method for producing an aluminum alloy foil of the present invention comprises hot rolling an aluminum alloy ingot containing Mg: 2.0 to 4.0 wt%, Cr: 0.1 wt% or less, with the balance being Al and inevitable impurities. Further, it is characterized in that it is subjected to intermediate annealing in the middle of cold rolling and, if necessary, cold rolling to finally make a foil of 65 to 100 μm, followed by final annealing at 270 ° C. to 330 ° C.
本発明のアルミニウム合金箔成形容器は、前記形態のアルミニウム合金箔からなることを特徴とする。 The aluminum alloy foil molding container of the present invention is characterized by comprising the aluminum alloy foil having the above-described form.
他の形態のアルミニウム合金箔成形容器は、前記形態の本発明において、電磁調理用に用いられることを特徴とする。 Another form of the aluminum alloy foil molded container is used for electromagnetic cooking in the present invention of the above form.
以下、本発明で規定している成分等の限定理由について説明する。 Hereinafter, the reasons for limiting the components defined in the present invention will be described.
Ｍｇ：２．０〜４．０ｗｔ％
Ｍｇは、アルミニウム合金箔の電気比抵抗を大きくし、かつ、箔の強度の向上に寄与する。Ｍｇの含有量が２．０ｗｔ％未満では、十分な電気比抵抗が得られない恐れがある。一方、Ｍｇの含有量が４．０ｗｔ％を超えると、アルミニウム合金箔の強度が高すぎるためにプレス成形が困難となるおそれがある。これより、Ｍｇの含有量を上記範囲に定める。なお、下限を２．２ｗｔ％、上限を３．０ｗｔ％とするのが望ましい。
Mg: 2.0-4.0 wt%
Mg increases the electrical specific resistance of the aluminum alloy foil and contributes to the improvement of the strength of the foil. If the Mg content is less than 2.0 wt%, there is a risk that sufficient electrical resistivity cannot be obtained. On the other hand, if the Mg content exceeds 4.0 wt%, the strength of the aluminum alloy foil is too high, and press molding may be difficult. Accordingly, the Mg content is set within the above range. It is desirable that the lower limit is 2.2 wt% and the upper limit is 3.0 wt%.
Ｃｒ：０．１ｗｔ％以下
Ｃｒは電気比抵抗を高める効果がある。しかし、その含有量が０．１ｗｔ％を超えると、所望の強度とするために、最終焼鈍の温度を上げる必要が生じ、その結果、最終焼鈍温度上昇により箔表面の変色を招くおそれがある。このためＣｒの含有量を上記範囲に定める。
なお、Ｃｒの含有量の下限は特に限定されないが、高品位地金を使用することによるコスト増や、電気比抵抗の低下により電磁調理器用アルミニウム合金箔成形容器として使用した場合に必要な加熱効率が得られない恐れから、下限を０．０００１ｗｔ％とするのが望ましい。
Cr: 0.1 wt% or less Cr has an effect of increasing electrical specific resistance. However, when the content exceeds 0.1 wt%, it is necessary to increase the temperature of the final annealing in order to obtain a desired strength, and as a result, the foil surface may be discolored due to an increase in the final annealing temperature. For this reason, the Cr content is set within the above range.
Although the lower limit of the Cr content is not particularly limited, the heating efficiency required when used as an aluminum alloy foil molding container for an electromagnetic cooker due to the increase in cost by using high-grade ingots or the decrease in electrical resistivity Therefore, the lower limit is preferably 0.0001 wt%.
箔厚：６５〜１００μｍ
アルミニウム合金箔の箔厚を薄くすることにより電磁調理器での加熱効率を良くすることができる。しかし、箔厚が６５μｍ未満では、成形容器として必要な強度が得られないおそれがあり、箔厚が１００μｍを超えると、電磁調理器用アルミニウム合金箔成形容器として使用した場合に必要な加熱効率が得られない。また、材料コストが増加するとともに容器重量が増加して輸送コストが上昇する等、経済的でない。このためアルミニウム合金箔の箔厚は上記範囲内であるのが望ましい。
Foil thickness: 65-100 μm
By reducing the thickness of the aluminum alloy foil, the heating efficiency in the electromagnetic cooker can be improved. However, if the foil thickness is less than 65 μm, the strength required as a molded container may not be obtained. If the foil thickness exceeds 100 μm, the heating efficiency required when used as an aluminum alloy foil molded container for an electromagnetic cooker is obtained. I can't. In addition, the material cost increases, the container weight increases, and the transportation cost increases, which is not economical. For this reason, the foil thickness of the aluminum alloy foil is desirably within the above range.
最終焼鈍温度：２７０℃〜３３０℃
最終焼鈍温度は箔表面の変色とプレス性に影響する。最終焼鈍温度が２７０℃未満では、箔が完全に再結晶しないために強度が高くなってプレス成形が困難となる恐れがある。最終焼鈍温度が３３０℃を超えると箔表面の変色を招く恐れがある。これより、最終焼鈍温度を上記範囲に定める。
Final annealing temperature: 270 ° C to 330 ° C
The final annealing temperature affects the discoloration and pressability of the foil surface. When the final annealing temperature is less than 270 ° C., the foil is not completely recrystallized, so that the strength becomes high and press molding may be difficult. If the final annealing temperature exceeds 330 ° C, the foil surface may be discolored. Thus, the final annealing temperature is set within the above range.
本発明によれば、アルミニウム合金箔に加熱処理を行った際の表面変色の発生が抑制され、表面品質に優れたアルミニウム合金箔およびアルミニウム合金箔成形容器が得られる効果がある。 ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the surface discoloration at the time of heat-processing to aluminum alloy foil is suppressed, and there exists an effect by which the aluminum alloy foil and aluminum alloy foil shaping | molding container excellent in surface quality are obtained.
本発明の一実施形態について説明する。
本発明の組成を有するアルミニウム合金を作製する。本発明としては、アルミニウム合金の製造方法が特定のものに限定されるものではなく、例えば、半連続鋳造法や連続鋳造法等の所望の方法によって作製することができる。
なお、得られた材料に対しては均質化処理を行うことが好ましい。均質化処理の条件は特に限定されないが、高温長時間で均質化処理を行うことが好ましい。例えば、５００℃〜６００℃で、３時間〜２０時間の条件にて均質化処理を行うことができる。
An embodiment of the present invention will be described.
An aluminum alloy having the composition of the present invention is prepared. In the present invention, the production method of the aluminum alloy is not limited to a specific one. For example, the aluminum alloy can be produced by a desired method such as a semi-continuous casting method or a continuous casting method.
In addition, it is preferable to perform the homogenization process with respect to the obtained material. The conditions for the homogenization treatment are not particularly limited, but the homogenization treatment is preferably performed at a high temperature for a long time. For example, the homogenization treatment can be performed at 500 ° C. to 600 ° C. for 3 hours to 20 hours.
均質化処理後の材料に対し、熱間圧延を行って所望の厚さとした後、冷間圧延、中間焼鈍、再度冷間圧延を経ることにより、所望の厚さのアルミニウム合金箔を得ることができる。箔厚は特に限定されないが、強度および電気抵抗などの観点から６５〜１００μｍとするのが望ましい。その後、最終焼鈍を経て、本発明のアルミニウム合金箔を得ることができる。最終焼鈍の条件は２７０℃〜３３０℃の温度で、３時間〜２０時間とするのが望ましい。 The material after the homogenization treatment is hot-rolled to a desired thickness, and then subjected to cold rolling, intermediate annealing, and cold rolling again to obtain an aluminum alloy foil having a desired thickness. it can. The foil thickness is not particularly limited, but is preferably 65 to 100 μm from the viewpoint of strength and electric resistance. Thereafter, through the final annealing, the aluminum alloy foil of the present invention can be obtained. The final annealing condition is preferably 270 ° C. to 330 ° C. and 3 hours to 20 hours.
得られたアルミニウム合金箔は特別に温度を上げる、真空炉を使用する、コイル端部を被覆するなどの特殊な焼鈍を行う必要がなく、表面の変色が抑制され、優れた表面品質を有している。 The obtained aluminum alloy foil does not require special annealing such as specially raising the temperature, using a vacuum furnace, or covering the coil end, and has excellent surface quality with suppressed surface discoloration. ing.
また、このアルミニウム合金箔を成形することにより、本発明のアルミニウム合金箔成形容器を得ることができる。成形はプレス成形等によって行うことができ、成形容器の形状については特に限定されず、たとえば、底部と、底部の周縁から立ち上がる周壁部と、周壁部の開口部から外側へ伸長するフランジ部とを有する加熱調理用のアルミニウム箔成形容器とすることができる。
得られたアルミニウム合金箔成形容器は、電気抵抗が大きくて高いＩＨ適性を有しており、電磁調理器での加熱に適している。また、この成形容器は、電磁調理に限られず、ガスコンロ等の直火による加熱調理に用いることも可能である。
Moreover, the aluminum alloy foil molding container of this invention can be obtained by shape | molding this aluminum alloy foil. The molding can be performed by press molding or the like, and the shape of the molding container is not particularly limited. For example, a bottom portion, a peripheral wall portion that rises from the periphery of the bottom portion, and a flange portion that extends outward from the opening portion of the peripheral wall portion. It can be set as the aluminum foil shaping | molding container for heat cooking which has.
The obtained aluminum alloy foil molded container has a large electric resistance and high IH suitability, and is suitable for heating in an electromagnetic cooker. Moreover, this molded container is not limited to electromagnetic cooking, but can also be used for cooking by direct fire such as a gas stove.
以下に、本発明の実施例について説明する。
表１の組成（残部がＡｌと不可避不純物）を有する厚さ５００ｍｍのアルミニウム合金鋳塊を半連続鋳造法によって作製した。得られた鋳塊の表面を面削し、５２０℃×１０時間の均質化処理後、冷却した。その後、５２０℃に再加熱し、熱間圧延で厚さ４．５ｍｍにし、冷間圧延、中間焼鈍、再度冷間圧延を行い表１記載の厚さとした後に、各々の箔が完全に再結晶する温度で（表１中記載）７時間の最終焼鈍を行い、アルミニウム合金軟質箔を得た。
Examples of the present invention will be described below.
A 500 mm thick aluminum alloy ingot having the composition shown in Table 1 (the balance being Al and inevitable impurities) was produced by a semi-continuous casting method. The surface of the resulting ingot was chamfered, cooled after 520 ° C. × 10 hours of homogenization. After that, it was reheated to 520 ° C., hot rolled to a thickness of 4.5 mm, cold rolled, intermediate annealed, cold rolled again to the thickness shown in Table 1, and then each foil was completely recrystallized. The final annealing for 7 hours was performed at the temperature (described in Table 1) to obtain an aluminum alloy soft foil.
得られたアルミニウム合金軟質箔に対し、変色、プレス性、およびＩＨ適性の評価を、以下の方法で行い、その評価結果を表１に示した。 The resulting aluminum alloy soft foil was evaluated for discoloration, pressability, and IH suitability by the following methods, and the evaluation results are shown in Table 1.
・変色
最終焼鈍前のアルミニウム合金箔との色調差がどの程度であるかを、目視によって判定した。
最終焼鈍前とほとんど色調差が見られなければ「○」と判定し、一部分もしくは全面がごく僅かに黄変していれば「△」と判定し、一部分もしくは全面が明らかに黄変していれば「×」と判定した。判定が△以上であれば実用上問題はないが、○であることが望ましい。
-Discoloration The degree of color tone difference from the aluminum alloy foil before final annealing was judged visually.
If there is almost no difference in color tone from before the final annealing, it is judged as “○”, and if part or the whole surface is slightly yellowed, it is judged as “△”, and part or the whole surface is clearly yellowed. And “×”. If the determination is greater than or equal to Δ, there is no practical problem, but it is desirable that the determination is ○.
・プレス性
アルミニウム合金箔１０００枚をプレス成形してアルミニウム箔成形容器（底部径：１１．６ｃｍ、周壁高さ：５．６ｃｍ、フランジ部幅：１．４ｃｍ）１０００個を作製した。作製した成形容器について、容器底部や壁面部に穴あきが発生した容器が１５個以下である場合はプレス性を「○」、１５個超かつ３０個以下であった場合はプレス性を「△」、３０個超であった場合はプレス性を「×」と判定した。プレス性の評価結果は○であることが望ましいが、評価結果が△以上であれば実用上問題のないプレス性を有している。
-Pressability 1000 aluminum alloy foils were press-molded to produce 1000 aluminum foil molded containers (bottom diameter: 11.6 cm, peripheral wall height: 5.6 cm, flange width: 1.4 cm). About the produced molded container, when the number of containers having perforations at the bottom or wall surface of the container is 15 or less, the pressability is “◯”, and when it is more than 15 and 30 or less, the pressability is “△ "If more than 30, the pressability was determined as" x ". The evaluation result of pressability is desirably ◯, but if the evaluation result is Δ or more, the pressability has no practical problem.
・ＩＨ（Ｉｎｄｕｃｔｉｏｎ Ｈｅａｔｉｎｇ）適性
電磁調理器用のアルミニウム合金箔として十分な電気比抵抗を有している指標として、ＩＨ適性評価を行った。
ＩＨ適性の評価は、プレス成形後のアルミニウム箔成形容器（底部径：１１．６ｃｍ、周壁高さ：５．６ｃｍ、フランジ部幅：１．４ｃｍ）に３５０ｃｃの水を入れ、電磁調理器により水温が２０℃から９０℃まで上昇する所要時間を測定することにより行った。
所要時間が１２０秒以下であれば電磁調理器用のアルミニウム合金箔として十分な性能（電気比抵抗）を有していると判断しＩＨ適性は「○」、所要時間が１２０秒を超え１３５秒以下であればＩＨ適性は「△」、所要時間が１３５秒を超えた場合は、ＩＨ適性は「×」と判定した。なお、試験は海抜５００ｍ地点で実施し、電磁調理器は日立製作所製ＨＴ−Ｂ６Ｓ（２００Ｖ、３．０ｋＷ）を用いた。判定結果が△であっても電磁調理器用アルミニウム合金箔として実用上問題は無いが、判定結果が○であることが望ましい。
-IH (Induction Heating) suitability IH suitability was evaluated as an index having sufficient electrical resistivity as an aluminum alloy foil for an electromagnetic cooker.
IH suitability was evaluated by placing 350 cc of water in an aluminum foil molded container (bottom diameter: 11.6 cm, peripheral wall height: 5.6 cm, flange width: 1.4 cm) after press molding, and water temperature using an electromagnetic cooker. Was measured by measuring the time required for the temperature to rise from 20 ° C to 90 ° C.
If the required time is 120 seconds or less, it is judged that it has sufficient performance (electrical resistivity) as an aluminum alloy foil for an electromagnetic cooker, the IH suitability is “◯”, the required time exceeds 120 seconds and is 135 seconds or less. In this case, the IH suitability was determined as “Δ”, and when the required time exceeded 135 seconds, the IH suitability was determined as “x”. In addition, the test was implemented at a point of 500 m above sea level, and the electromagnetic cooker used was HT-B6S (200 V, 3.0 kW) manufactured by Hitachi. Even if the determination result is Δ, there is no practical problem as an aluminum alloy foil for an electromagnetic cooker, but it is desirable that the determination result is ○.
評価結果によれば、本発明の規定を満たしている実施例では、変色、プレス性、およびＩＨ適性の全てにおいて良い結果が得られたのに対し、本発明の規定を満たしていない比較例では、変色、プレス性、またはＩＨ適性のいずれか一つ以上において良い結果が得られなかった。 According to the evaluation results, good results were obtained in all of the discoloration, pressability, and IH suitability in the examples satisfying the provisions of the present invention, whereas in the comparative examples not satisfying the provisions of the present invention. No good results were obtained in any one or more of discoloration, pressability, and IH suitability.
以上、本発明について、上記実施形態と実施例に基づいて説明を行ったが、本発明は上記説明の内容に限定されるものではなく、本発明の範囲を逸脱しない限りは上記実施形態および実施例に対する適宜の変更が可能である。 The present invention has been described based on the above embodiment and examples. However, the present invention is not limited to the content of the above description, and the above embodiment and implementation are not departed from the scope of the present invention. Appropriate changes to the examples are possible.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20160286610A1 (en) * | 2014-01-10 | 2016-09-29 | Electrolux Appliances Aktiebolag | Induction cooker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20160286610A1 (en) * | 2014-01-10 | 2016-09-29 | Electrolux Appliances Aktiebolag | Induction cooker |
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