JP2009242865A - Method for producing high-purity aluminum rolled material - Google Patents
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本発明は、高純度アルミニウム高圧延材の製造方法に関し、詳しくは純度９９．９９９％以上９９．９９９９％未満の高純度アルミニウム鋳塊材に熱間圧延処理を施して熱間圧延材を得、この熱間圧延材に冷間圧延処理を施すことにより、加工率４０％超で、十分な硬度の高圧延材を製造する方法に関する。 The present invention relates to a method for producing a high-purity aluminum high-rolled material. Specifically, a hot-rolled material is obtained by subjecting a high-purity aluminum ingot material having a purity of 99.999% or more and less than 99.9999% to hot rolling, The present invention relates to a method for producing a high-rolled material with sufficient hardness at a processing rate exceeding 40% by subjecting the hot-rolled material to a cold rolling process.
純度９９．９９％未満の普通アルミニウム鋳塊材から圧延材を製造する方法としては、この鋳塊材に熱間圧延処理を施して熱間圧延材を得、この熱間圧延材に冷間圧延処理または温間圧延処理を施す方法が広く用いられている。〔特許文献１：特開平８−３０２４５０号公報〕。 As a method of producing a rolled material from a normal aluminum ingot having a purity of less than 99.99%, a hot rolled material is obtained by subjecting the ingot material to a hot rolling process, and the hot rolled material is cold-rolled. A method of performing a treatment or a warm rolling treatment is widely used. [Patent Document 1: JP-A-8-302450].
しかし、かかる従来の製造方法を純度９９．９９９％以上９９．９９９９％未満の高純度アルミニウム鋳塊材に適用して、この熱間圧延材に対する加工率が４０％超の高圧延材を得ようとすると、その硬度が不十分なものとなり易いことが分かった。硬度が不十分な高圧延材は、これに冷間圧延処理、矯正処理、洗浄処理などを施すと、表面の平滑度が低くなり、また極低温での電気伝導度、熱伝導度が不十分なものとなる。 However, such a conventional manufacturing method is applied to a high-purity aluminum ingot having a purity of 99.999% or more and less than 99.9999% to obtain a high-rolled material having a processing rate of more than 40% for the hot-rolled material. It was found that the hardness tends to be insufficient. High-rolled material with insufficient hardness, when subjected to cold rolling treatment, straightening treatment, cleaning treatment, etc., the surface smoothness becomes low, and electrical conductivity and thermal conductivity at extremely low temperatures are insufficient. It will be something.
そこで本発明者は、純度９９．９９９％以上９９．９９９９％未満の高純度アルミニウム鋳塊材に熱間圧延処理を施して熱間圧延材を得、この熱間圧延材に冷間圧延処理を施すことにより、加工率４０％超で、十分な硬度の高圧延材を製造しうる方法を開発するべく鋭意検討した結果、本発明に至った。 Therefore, the present inventor obtained a hot-rolled material by hot-rolling a high-purity aluminum ingot material having a purity of 99.999% or more and less than 99.9999%, and subjecting the hot-rolled material to a cold-rolling treatment. As a result of intensive studies to develop a method capable of producing a high-rolled material having a sufficient hardness with a processing rate exceeding 40%, the present invention has been achieved.
すなわち本発明は、純度９９．９９９％以上９９．９９９９％未満の高純度アルミニウム鋳塊材に加工温度２６０℃以上の熱間圧延処理を施すことにより熱間圧延材を得、
得られた熱間圧延材に圧延処理を施して、該熱間圧延材に対する加工率が４０％超の高純度アルミニウム高圧延材を製造する方法であり、
前記熱間圧延材に、１パス加工率２０％以下で加工温度６０℃未満の第一冷間圧延処理または１パス加工率４０％以下で加工温度６０℃以上２６０℃未満の第二冷間圧延処理を３時間以内の処理間隔で繰り返し施すことを特徴とする前記高純度アルミニウム高圧延材の製造方法を提供するものである。
That is, the present invention provides a hot-rolled material by subjecting a high-purity aluminum ingot material with a purity of 99.999% or more and less than 99.9999% to a hot rolling treatment at a processing temperature of 260 ° C. or more,
The obtained hot-rolled material is subjected to a rolling treatment to produce a high-purity aluminum high-rolled material having a processing rate of more than 40% with respect to the hot-rolled material,
A first cold rolling process at a processing temperature of less than 60 ° C. with a one-pass processing rate of 20% or less or a second cold rolling at a processing temperature of 60 ° C. or more and less than 260 ° C. with a one-pass processing rate of 40% or less. The present invention provides a method for producing the high-purity aluminum high-rolled material, wherein the treatment is repeatedly performed at a treatment interval of 3 hours or less.
本発明の製造方法によれば、純度９９．９９９％以上９９．９９９９％未満の高純度アルミニウム鋳塊材に熱間圧延処理を施して得られた熱間圧延材から、冷間圧延処理により、加工率４０％超で、十分な硬度の高圧延材を製造することができる。 According to the production method of the present invention, from a hot-rolled material obtained by subjecting a high-purity aluminum ingot material having a purity of 99.999% or more and less than 99.9999% to hot rolling treatment, by cold rolling treatment, With a processing rate exceeding 40%, a high-rolled material with sufficient hardness can be produced.
〔高純度アルミニウム鋳塊材〕
本発明の製造方法に適用される高純度アルミニウム鋳塊材は、純度９９．９９９％以上９９．９９９９％未満であり、例えば高純度アルミニウムを加熱溶融して溶湯とし、得られた高純度アルミニウム溶湯を冷却固化させる通常の方法で得ることができる。溶湯の温度は高純度アルミニウムの溶融温度以上であり、通常は７００℃〜８００℃である。高純度アルミニウムの加熱溶融は、通常、真空中あるいは窒素ガス、アルゴンガスなどの不活性ガス雰囲気下に、黒鉛製ルツボ内で行われる。高純度アルミニウム溶湯の冷却固化は通常、例えば鋳鉄製鋳型内、黒鉛製鋳型内などで行われる。
[High purity aluminum ingot material]
The high-purity aluminum ingot material applied to the production method of the present invention has a purity of 99.999% or more and less than 99.9999%. For example, the high-purity aluminum molten metal obtained by heating and melting high-purity aluminum to obtain a molten metal. Can be obtained by a usual method of cooling and solidifying. The temperature of the molten metal is not less than the melting temperature of high-purity aluminum, and is usually 700 ° C to 800 ° C. Heat melting of high-purity aluminum is usually performed in a graphite crucible in a vacuum or in an inert gas atmosphere such as nitrogen gas or argon gas. The high-purity molten aluminum is usually cooled and solidified, for example, in a cast iron mold or a graphite mold.
高純度アルミニウム鋳塊材の純度は質量百分率で表わされ、通常、
Ｆｅ、Ｓｉ、Ｃｕ、Ｂ 、Ｍｇ、Ｔｉ、Ｖ、Ｃｒ、Ｎｉ、Ｚｎ、
Ｇａ、Ａｓ、Ｚｒ、Ｃｅ、Ｎｄ、Ｌｉ、Ｂｅ、Ｎａ、Ｋ、Ｃａ、
Ｍｎ、Ｃｏ、Ｍｏ、Ａｇ、Ｃｄ、Ｉｎ、Ｓｎ、Ｓｂ、Ｂａ、Ｌａ、
Ｌａ、Ｐｔ、Ｈｇ、Ｐｂ、Ｂｉ、ＴｈおよびＵについて、それぞれ元素の含有量を求め、その合計量を１００％から差し引くことにより求めることができる。これらの元素の含有量は、それぞれグロー放電質量分析法により定量することができる。高純度アルミニウム鋳塊材は、上記３７元素以外の不可避不純物を含んでいてもよい。
The purity of the high-purity aluminum ingot material is expressed as a percentage by mass.
Fe, Si, Cu, B, Mg, Ti, V, Cr, Ni, Zn,
Ga, As, Zr, Ce, Nd, Li, Be, Na, K, Ca,
Mn, Co, Mo, Ag, Cd, In, Sn, Sb, Ba, La,
About La, Pt, Hg, Pb, Bi, Th, and U, it can obtain | require by calculating | requiring the content of an element, respectively, and subtracting the total amount from 100%. The contents of these elements can be quantified by glow discharge mass spectrometry, respectively. The high-purity aluminum ingot material may contain inevitable impurities other than the 37 elements.
高純度アルミニウム鋳塊材は、０．１ｐｐｍ以上のＦｅ、１ｐｐｍ以上のＳｉおよび１ｐｐｍ以上のＣｕを含むことが好ましい。 The high-purity aluminum ingot material preferably contains 0.1 ppm or more of Fe, 1 ppm or more of Si, and 1 ppm or more of Cu.
〔熱間圧延処理〕
かかる高純度アルミニウム鋳塊材に熱間圧延処理を施して熱間圧延材を得る。熱間圧延処理は、通常の方法、例えば加熱した鋳塊材を一対のロールの間に挟み込むことにより圧力を加えながら、これらのロール間を通過させる方法などにより施される。熱間圧延処理温度は、通常２６０℃以上６００℃以下、好ましくは３００℃以上５００℃以下である。
[Hot rolling process]
Such a high-purity aluminum ingot material is hot-rolled to obtain a hot-rolled material. The hot rolling process is performed by a normal method, for example, a method of passing between these rolls while applying pressure by sandwiching a heated ingot material between a pair of rolls. The hot rolling treatment temperature is usually 260 ° C. or higher and 600 ° C. or lower, preferably 300 ° C. or higher and 500 ° C. or lower.
熱間圧延処理を施す前の高純度アルミニウム鋳塊材の断面積(ＳH0)と、熱間圧延処理を施した後の熱間圧延材の断面積(ＳH)とから式（１）
熱間圧延加工率（％）＝［（ＳH0−ＳH）／ＳH0］×１００・・・（１）
により求められる熱間圧延加工率は、通常５０％〜９０％、好ましくは６０％〜８０％である。
熱間圧延処理は、１回で行われてもよいし、複数回に分けて繰り返し施されてもよい。
Sectional area of the high-purity aluminum ingot material before applying the hot rolling process and (S H0), the cross-sectional area of the hot rolled material was subjected to a hot rolling process (S H) Tokara formula (1)
Hot rolling ratio (%) = [(S H0 −S H ) / S H0 ] × 100 (1)
The hot rolling process rate calculated | required by (50) is 50%-90% normally, Preferably it is 60%-80%.
The hot rolling process may be performed once, or may be repeatedly performed in a plurality of times.
〔冷間圧延処理〕
熱間圧延処理により得られた熱間圧延材に、冷間圧延処理を繰り返し施す。冷間圧延処理は、通常の方法、例えば熱間圧延処理により得られた熱間圧延材を一対のロールの間に挟み込むことより圧力を加えながら、これらのロール間を通過させる方法などにより施される。本発明の製造方法においては、以下の第一冷間圧延処理か、または第二冷間圧延処理を施す。
(Cold rolling process)
A cold rolling process is repeatedly performed on the hot rolled material obtained by the hot rolling process. The cold rolling treatment is performed by a normal method, for example, a method of passing between these rolls while applying pressure by sandwiching the hot rolled material obtained by the hot rolling treatment between a pair of rolls. The In the production method of the present invention, the following first cold rolling treatment or second cold rolling treatment is performed.
〔第一冷間圧延処理〕
第一冷間圧延処理における１パス加工率は２０％以下である。１パス加工率は、１回の圧延処理で圧延材に施される加工率であって、第一冷間圧延処理の１パス加工率は、第一冷間圧延処理を施す前の圧延材の断面積(Ｓ10)と、第一冷間圧延処理を施した後の圧延材の断面積(Ｓ1)とのから式（２）
冷間圧延加工率（％）＝［（Ｓ10−Ｓ1）／Ｓ10］×１００・・・（２）
により求められる。１パス加工率は、２０％以下、通常は５％以上、好ましくは１０％以上である。
[First cold rolling process]
The one-pass processing rate in the first cold rolling process is 20% or less. The 1-pass processing rate is the processing rate applied to the rolled material in one rolling process, and the 1-pass processing rate of the first cold rolling process is the rolling material before the first cold rolling process. From the cross-sectional area (S 10 ) and the cross-sectional area (S 1 ) of the rolled material after the first cold rolling treatment, the formula (2)
Cold rolling processing rate (%) = [(S 10 −S 1 ) / S 10 ] × 100 (2)
It is calculated by. The one-pass processing rate is 20% or less, usually 5% or more, preferably 10% or more.
第一冷間圧延処理の加工温度は６０℃未満、好ましくは５０℃以下、通常は０℃以上である。第一冷間圧延処理中、圧延処理による発熱により上記加工温度を超えることがあるが、このような場合には、圧延処理を一旦中断して冷却してから再開してもよいし、上記加工温度を超えないように、冷却しながら圧延処理を施してもよい。 The processing temperature of the first cold rolling treatment is less than 60 ° C, preferably 50 ° C or less, and usually 0 ° C or more. During the first cold rolling process, the above processing temperature may be exceeded due to heat generated by the rolling process. In such a case, the rolling process may be temporarily interrupted and cooled and restarted. You may perform a rolling process, cooling, so that temperature may not be exceeded.
〔第二冷間圧延処理〕
第二冷間圧延処理における１パス加工率は２０％以下である。第二冷間圧延処理の１パス加工率は、第二冷間圧延処理を施す前の圧延材の断面積(Ｓ20)と、第二冷間圧延処理を施した後の圧延材の断面積(Ｓ2)とのから式（３）
温間圧延加工率（％）＝［（Ｓ20−Ｓ2）／Ｓ20］×１００・・・（３）
により求められる。第二冷間圧延処理における１パス加工率は、４０％下、好ましくは３０％以下であり、通常は１０％以上、好ましくは２０％以上である。
[Second cold rolling process]
The one-pass processing rate in the second cold rolling process is 20% or less. The one-pass processing rate of the second cold rolling process is the cross sectional area (S 20 ) of the rolled material before the second cold rolling process and the cross sectional area of the rolled material after the second cold rolling process. Equation (3) from (S 2 )
Warm rolling ratio (%) = [(S 20 −S 2 ) / S 20 ] × 100 (3)
It is calculated by. The one-pass processing rate in the second cold rolling process is 40% lower, preferably 30% or lower, and usually 10% or higher, preferably 20% or higher.
第二冷間圧延処理の加工温度は６０℃以上、好ましくは６５℃以上であり、２６０℃未満、好ましくは２００℃以下である。第二冷間圧延処理中、大気中などへの放熱により上記加工温度を保てなくなることがあるが、このような場合には、圧延処理を一旦中断し、再度加熱してから圧延処理を再開してもよいし、外部から加熱しながら圧延処理を施してもよい。 The processing temperature of the second cold rolling treatment is 60 ° C. or higher, preferably 65 ° C. or higher, and less than 260 ° C., preferably 200 ° C. or lower. During the second cold rolling process, the above processing temperature may not be maintained due to heat radiation to the atmosphere. In such a case, the rolling process is temporarily interrupted, heated again and then restarted. Alternatively, the rolling process may be performed while heating from the outside.
〔冷間圧延処理の繰り返し〕
本発明の製造方法では、上記の第一冷間圧延処理または第二冷間圧延処理を繰り返し施すことにより、高純度アルミニウム高圧延材を得る。繰り返し回数は、第一冷間圧延処理または第二冷間圧延処理の１パス加工率により異なり、熱間圧延材に対する加工率が４０％超となるまで行われる。
[Repeated cold rolling process]
In the production method of the present invention, a high-purity aluminum high-rolled material is obtained by repeatedly applying the first cold rolling process or the second cold rolling process. The number of repetitions varies depending on the one-pass processing rate of the first cold rolling process or the second cold rolling process, and is performed until the processing rate for the hot-rolled material exceeds 40%.
高純度アルミニウム高圧延材の熱間圧延材に対する加工率は、熱間圧延材の断面積(ＳH)と、得られた高純度アルミニウム高圧延材の断面積(Ｓ)とから、式（４）
加工率（％）＝［（ＳH−Ｓ）／ＳH］×１００・・・（４）
により求められる。
The processing ratio of the high-purity aluminum high-rolled material to the hot-rolled material is calculated from the cross-sectional area (S H ) of the hot-rolled material and the cross-sectional area (S) of the obtained high-purity aluminum high-rolled material. )
Processing rate (%) = [(S H −S) / S H ] × 100 (4)
It is calculated by.
上記第一冷間圧延処理または第二冷間圧延処理は、第一冷間圧延処理だけを繰り返し施してもよいし、第二冷間圧延処理だけを繰り返し施してもよく、第一冷間圧延処理と第二冷間圧延処理とを適宜組合わせて繰り返し施してもよい。 The first cold rolling process or the second cold rolling process may be repeated only the first cold rolling process, or may be repeated only the second cold rolling process. The treatment and the second cold rolling treatment may be repeated as appropriate in combination.
繰り返し施される第一冷間圧延処理または第二冷間圧延処理の処理間隔は、３時間以内であり、好ましくは１時間以内である。処理間隔が３時間を越えると、得られる高純度アルミニウム高圧延材は硬度が不十分なものとなり易い。 The processing interval of the first cold rolling process or the second cold rolling process repeatedly applied is within 3 hours, preferably within 1 hour. When the treatment interval exceeds 3 hours, the resulting high-purity aluminum high-rolled material tends to have insufficient hardness.
〔焼鈍〕
かくして目的の高純度アルミニウム高圧延材を得るが、得られた高純度アルミニウム高圧延材に焼鈍処理を施してもよい。焼鈍処理は、例えば高純度アルミニウム高圧延材を４００℃〜６００℃の温度で、１時間以上、好ましくは３時間以上、通常は２４時間以下保持することにより行われる。焼鈍処理を施すことにより、電気伝導率および熱伝導率がより高い高電気伝導・高熱伝導性高純度アルミニウム材を得ることができる。
[Annealing]
Thus, the target high-purity aluminum high-rolled material is obtained, but the obtained high-purity aluminum high-rolled material may be annealed. The annealing treatment is performed, for example, by holding a high-purity aluminum high-rolled material at a temperature of 400 ° C. to 600 ° C. for 1 hour or longer, preferably 3 hours or longer, and usually 24 hours or shorter. By performing the annealing treatment, it is possible to obtain a high-purity aluminum material having higher electrical conductivity and higher thermal conductivity and higher electrical conductivity and higher thermal conductivity.
〔用途〕
本発明の製造方法により得られる超高純度アルミニウム高圧延材は、例えば冷凍機、クライオポンプ、超電導マグネットなどにおいて２０Ｋ以下の極低温で使用される電気伝導体や熱伝導体などに好適に用いられる。
[Use]
The ultra-high purity aluminum high-rolled material obtained by the production method of the present invention is suitably used for electrical conductors and thermal conductors used at cryogenic temperatures of 20K or less, for example, in refrigerators, cryopumps, superconducting magnets, and the like. .
以下、実施例によって本発明の製造方法をより詳細に説明するが、本発明の製造方法は、かかる実施例によって限定されるものではない。 Hereinafter, although the manufacturing method of this invention is demonstrated in detail by an Example, the manufacturing method of this invention is not limited by this Example.
なお、各実施例において得られた高純度アルミニウム高圧延材の表面のビッカース硬度は、島津製作所社製「マイクロビッカース硬度計」を用いて荷重１００ｇの条件で測定した。 In addition, the Vickers hardness of the surface of the high-purity aluminum high-rolled material obtained in each Example was measured under the condition of a load of 100 g using a “Micro Vickers hardness meter” manufactured by Shimadzu Corporation.
実施例１
〔高純度アルミニウム鋳塊材の鋳造〕
第１表に示す元素組成の高純度アルミニウム〔純度９９．９９９４％〕を黒鉛ルツボ中、真空下に７８０℃に加熱し、得られた高純度アルミニウム溶湯を鋳鉄製鋳型〔１５０℃〕に流し込んで、板状〔縦１５０ｍｍ×横２００ｍｍ×厚み２２ｍｍ〕とし、全表面を１ｍｍ深さまで研削し、縦５０ｍｍ×横５０ｍｍに切り出して厚み２０ｍｍの高純度アルミニウム鋳塊材を得た。なお、用いた高純度アルミニウム中の元素含有量は、それぞれグロー放電質量分析機〔サーモエレクトロン社製「ＶＧ９０００」〕を用いてグロー放電質量分析法により測定した。
Example 1
[Casting high-purity aluminum ingots]
High purity aluminum (purity 99.9994%) having the elemental composition shown in Table 1 was heated to 780 ° C. in a graphite crucible under vacuum, and the resulting high purity aluminum melt was poured into a cast iron mold [150 ° C.]. The plate was formed into a plate shape [length 150 mm × width 200 mm × thickness 22 mm], and the entire surface was ground to a depth of 1 mm, cut into a length 50 mm × width 50 mm, and a high-purity aluminum ingot material having a thickness of 20 mm was obtained. The element content in the high-purity aluminum used was measured by glow discharge mass spectrometry using a glow discharge mass spectrometer (“VG9000” manufactured by Thermo Electron).
第 １ 表
（単位：ｐｐｍ）
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
元素 含有量 元素 含有量 元素 含有量 元素 含有量
────────────────────────────────────────
Ｆｅ ０．６２ Ｓｉ ２．４ Ｃｕ ２．１
────────────────────────────────────────
Ｂ ０．０４１ Ｍｇ ０．５５ Ｔｉ ０．０４４ Ｖ ０．０２４
Ｃｒ ０．０３１ Ｎｉ ０．０２７ Ｚｎ ０．０９４ Ｇａ ０．０１４
Ａｓ ０．０５２ Ｚｒ ０．０３２ Ｃｅ ０．０９２ Ｎｄ ０．０３６
Ｌｉ＜０．００１ Ｂｅ＜０．００１ Ｎａ ０．００９ Ｋ ０．００８
Ｃａ ０．００５ Ｍｎ ０．０１１ Ｃｏ＜０．００１ Ｍｏ＜０．００１
Ａｇ＜０．００１ Ｃｄ ０．００３ Ｉｎ＜０．００１ Ｓｎ ０．００１
Ｓｂ ０．００２ Ｂａ＜０．００１ Ｌａ ０．０２６ Ｐｔ＜０．００１
Ｈｇ ０．００１ Ｐｂ ０．００３ Ｂｉ ０．００２ Ｔｈ ０．０１
Ｕ ０．０２５
────────────────────────────────────────
Ｈｆ＜０．００１ Ｗ ＜０．００１ Ｒｅ＜０．００１ Ａｕ＜０．３４
Ｔｌ＜０．００１
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
表中、Ｌｉ、Ｂｅ、Ｃｏ、Ｍｏ、Ａｇ、Ｉｎ、Ｂａ、Ｐｔ、Ｗ、ＲｅおよびＴｌの含有量は、それぞれ検出下限（０．００１ｐｐｍ）未満であった。Ａｕの含有量は検出下限（０．３４ｐｐｍ）以下であった。
Table 1
(Unit: ppm)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Element content Element content Element content Element content
────────────────────────────────────────
Fe 0.62 Si 2.4 Cu 2.1
────────────────────────────────────────
B 0.041 Mg 0.55 Ti 0.044 V 0.024
Cr 0.031 Ni 0.027 Zn 0.094 Ga 0.014
As 0.052 Zr 0.032 Ce 0.092 Nd 0.036
Li <0.001 Be <0.001 Na 0.009 K 0.008
Ca 0.005 Mn 0.011 Co <0.001 Mo <0.001
Ag <0.001 Cd 0.003 In <0.001 Sn 0.001
Sb 0.002 Ba <0.001 La 0.026 Pt <0.001
Hg 0.001 Pb 0.003 Bi 0.002 Th 0.01
U 0.025
────────────────────────────────────────
Hf <0.001 W <0.001 Re <0.001 Au <0.34
Tl <0.001
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
In the table, the contents of Li, Be, Co, Mo, Ag, In, Ba, Pt, W, Re, and Tl were each less than the lower detection limit (0.001 ppm). The Au content was not more than the lower limit of detection (0.34 ppm).
〔熱間圧延処理〕
得られた高純度アルミニウム鋳塊材に、加工温度５００℃、１パス加工率２０％の熱間圧延処理を４回繰り返し施して、熱間圧延材〔縦５０ｍｍ×横１２５ｍｍ×厚み８ｍｍ〕を得た。
[Hot rolling process]
The obtained high-purity aluminum ingot material was repeatedly subjected to hot rolling treatment at a processing temperature of 500 ° C. and a one-pass processing rate of 20% four times to obtain a hot-rolled material (length 50 mm × width 125 mm × thickness 8 mm). It was.
〔第一冷間圧延処理〕
得られた熱間圧延材に、室温（２５℃）雰囲気下、２０℃〜５０℃の温度範囲に維持しながら１パス加工率１８％の冷間圧延処理を１４回施して、高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。冷間圧延処理の間、圧延材は、圧延による発熱により温度６０℃以上となると、直ちに圧延処理を中断し、２０℃の水に浸漬して冷却する操作を繰り返した。
[First cold rolling process]
The obtained hot-rolled material was subjected to 14 cold rolling treatments with a one-pass processing rate of 18% while maintaining a temperature range of 20 ° C. to 50 ° C. in a room temperature (25 ° C.) atmosphere, and high purity aluminum A rolled material (thickness 0.5 mm) was obtained. During the cold rolling treatment, when the temperature of the rolled material reached 60 ° C. or higher due to heat generated by rolling, the rolling treatment was immediately interrupted, and the operation of cooling by immersing in 20 ° C. water was repeated.
得られた高純度アルミニウム高圧延材の表面のビッカース硬度を測定したところ、３８．８であった。 It was 38.8 when the Vickers hardness of the surface of the obtained high purity aluminum high rolling material was measured.
比較例１
第一冷間圧延処理における１パス加工率を２６％とし、第二冷間圧延処理の回数を９回とした以外は実施例１と同様に操作して高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。この高純度アルミニウム高圧延材の表面のビッカース硬度は１７．９であった。
Comparative Example 1
The high-purity aluminum high-rolled material (thickness 0. 0) was operated in the same manner as in Example 1 except that the one-pass processing rate in the first cold rolling treatment was 26% and the number of times of the second cold rolling treatment was nine. 5 mm) was obtained. The surface of this high-purity aluminum high-rolled material had a Vickers hardness of 17.9.
実施例２
〔第二冷間圧延処理〕
実施例１で得た熱間圧延材に、室温（２５℃）雰囲気下、７０℃〜１５０℃の温度範囲に維持しながら１パス加工率１８％の冷間圧延処理を１４回施して、高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。冷間圧延処理の間、圧延材は、１５０℃まで加熱してから圧延処理を施し、圧延処理中に７０℃になった時点で、直ちに圧延処理を中断し、再び１５０℃に加熱する操作を繰り返した。得られた高純度アルミニウム高圧延材の表面のビッカース硬度を測定したところ、３７．０であった。
Example 2
[Second cold rolling process]
The hot-rolled material obtained in Example 1 was subjected to 14 cold rolling treatments with a one-pass working rate of 18% while maintaining a temperature range of 70 ° C. to 150 ° C. in a room temperature (25 ° C.) atmosphere, A pure aluminum high rolled material (thickness 0.5 mm) was obtained. During the cold rolling process, the rolled material is heated to 150 ° C. and then subjected to the rolling process. When the temperature reaches 70 ° C. during the rolling process, the rolling process is immediately interrupted and the operation of heating to 150 ° C. is performed again. Repeated. It was 37.0 when the Vickers hardness of the surface of the obtained high purity aluminum high rolling material was measured.
実施例３
第二冷間圧延処理の１パス加工率を２６％とし、第二冷間圧延処理の回数を９回とした以外は実施例２と同様に操作して高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。この高純度アルミニウム高圧延材の表面のビッカース硬度は３８．８であった。
Example 3
A high-purity aluminum high-rolled material (thickness 0. 0) was operated in the same manner as in Example 2 except that the one-pass processing rate of the second cold rolling treatment was 26% and the number of times of the second cold rolling treatment was nine. 5 mm) was obtained. The surface of this high-purity aluminum high-rolled material had a Vickers hardness of 38.8.
実施例４
第二冷間圧延処理の１パス加工率を３７％とし、第二冷間圧延処理の回数を６回とした以外は実施例２と同様に操作して高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。この高純度アルミニウム高圧延材の表面のビッカース硬度は４０．５であった。
Example 4
A high-purity aluminum high-rolled material (thickness 0. 0) was operated in the same manner as in Example 2 except that the one-pass processing rate of the second cold rolling treatment was 37% and the number of times of the second cold rolling treatment was six. 5 mm) was obtained. The surface of this high-purity aluminum high-rolled material had a Vickers hardness of 40.5.
実施例５
〔第二冷間圧延処理〕
実施例１で得た熱間圧延材に、室温（２５℃）雰囲気下、１２０℃〜２５０℃の温度範囲に維持しながら１パス加工率１８％の冷間圧延処理を１４回施して、高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。冷間圧延処理の間、圧延材は、２５０℃まで加熱してから圧延処理を施し、圧延処理中に１２０℃になった時点で、直ちに圧延処理を中断し、再び２５０℃に加熱する操作を繰り返した。得られた高純度アルミニウム高圧延材の表面のビッカース硬度を測定したところ、３４．６であった。
Example 5
[Second cold rolling process]
The hot-rolled material obtained in Example 1 was subjected to a cold rolling treatment with a one-pass working rate of 18% 14 times while maintaining a temperature range of 120 ° C. to 250 ° C. in a room temperature (25 ° C.) atmosphere. A pure aluminum high rolled material (thickness 0.5 mm) was obtained. During the cold rolling process, the rolled material is heated to 250 ° C. and then subjected to the rolling process. When the temperature reaches 120 ° C. during the rolling process, the rolling process is immediately interrupted and the operation of heating to 250 ° C. is performed again. Repeated. It was 34.6 when the Vickers hardness of the surface of the obtained high purity aluminum highly rolled material was measured.
〔焼鈍処理〕
得られた高純度アルミニウム高圧延材を大気中、５００℃で３時間保持して高電気伝導・高熱伝導性高純度アルミニウム材を得た。
[Annealing treatment]
The obtained high-purity aluminum high-rolled material was kept in the atmosphere at 500 ° C. for 3 hours to obtain a high-purity aluminum material having high electrical conductivity and high thermal conductivity.
得られた高電気伝導・高熱伝導性高純度アルミニウム材を液体ヘリウム（４．２Ｋ）中に浸漬し、４端子法で比抵抗を測定したところ０．６５ｎΩｍであった。ヴィーデマンフランツ則に従い、式（５）
λ(Ｔ)・ρ(Ｔ)＝Ｌ・Ｔ ・・・ （５）
〔式中、λ(Ｔ)は温度Ｔ(Ｋ)における熱伝導率を、ρ(Ｔ)は温度Ｔ(Ｋ)における比抵抗を、Ｌはローレンツ定数を、Ｔは温度(Ｋ)をそれぞれ示す。〕
より求めた熱伝導率は、約１５０００Ｗ／ｍ／Ｋである。
The obtained high-electrical conductivity / high-thermal conductivity high-purity aluminum material was immersed in liquid helium (4.2 K), and the specific resistance was measured by a four-terminal method. As a result, it was 0.65 nΩm. According to Wiedemann Franz rule, formula (5)
λ (T) · ρ (T) = L · T (5)
[In the formula, λ (T) represents thermal conductivity at temperature T (K), ρ (T) represents specific resistance at temperature T (K), L represents Lorentz constant, and T represents temperature (K). . ]
The more determined thermal conductivity is about 15000 W / m / K.
実施例６
第二冷間圧延処理の１パス加工率を２６％とし、第二冷間圧延処理の回数を９回とした以外は実施例５と同様に操作して高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。この高純度アルミニウム高圧延材の表面のビッカース硬度は３１．８であった。
Example 6
A high-purity aluminum high-rolled material (thickness 0. 0) was operated in the same manner as in Example 5 except that the one-pass processing rate of the second cold rolling treatment was 26% and the number of times of the second cold rolling treatment was nine. 5 mm) was obtained. The Vickers hardness of the surface of this high-purity aluminum high-rolled material was 31.8.
実施例７
〔第二冷間圧延処理〕
第二冷間圧延処理の１パス加工率を３７％とし、第二冷間圧延処理の回数を６回とした以外は実施例５と同様に操作して高純度アルミニウム高圧延材（厚み０．５ｍｍ）を得た。この高純度アルミニウム高圧延材の表面のビッカース硬度は３９．４であった。
Example 7
[Second cold rolling process]
A high-purity aluminum high-rolled material (thickness 0. 0) was operated in the same manner as in Example 5 except that the one-pass processing rate of the second cold rolling treatment was 37% and the number of times of the second cold rolling treatment was six. 5 mm) was obtained. The Vickers hardness of the surface of this high-purity aluminum high-rolled material was 39.4.
Claims (3)
得られた熱間圧延材に圧延処理を施して、該熱間圧延材に対する加工率が４０％超の高純度アルミニウム高圧延材を製造する方法であり、
前記熱間圧延材に、
１パス加工率２０％以下で加工温度６０℃未満の第一冷間圧延処理または
１パス加工率４０％以下で加工温度６０℃以上２６０℃未満の第二冷間圧延処理
を３時間以内の処理間隔で
繰り返し施す
ことを特徴とする前記高純度アルミニウム高圧延材の製造方法。 A hot-rolled material is obtained by subjecting a high-purity aluminum ingot material having a purity of 99.999% or more and less than 99.9999% to a hot rolling process at a processing temperature of 260 ° C. or more,
The obtained hot-rolled material is subjected to a rolling treatment to produce a high-purity aluminum high-rolled material having a processing rate of more than 40% with respect to the hot-rolled material,
In the hot rolled material,
The first cold rolling process at a processing temperature of less than 60 ° C. with a 1-pass processing rate of 20% or less or the second cold rolling process with a processing temperature of 60 ° C. or more and less than 260 ° C. at a processing temperature of 40% or less within 3 hours The method for producing the high-purity aluminum high-rolled material, which is repeatedly applied at intervals.
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| GB2490424A (en) * | 2011-04-28 | 2012-10-31 | Kek High Energy Accelerator | Magnetic shield made from aluminium alloy with a purity of a least 99.999 % |
| GB2490585A (en) * | 2011-04-28 | 2012-11-07 | Kek High Energy Accelerator | High purity aluminium material wire for strong magnetic field operation |
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| JPH0466204A (en) * | 1990-06-30 | 1992-03-02 | Nippon Foil Mfg Co Ltd | Manufacture of aluminum foil for electrolytic condenser |
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| DE102012008619A1 (en) | 2011-04-28 | 2012-10-31 | Inter-University Research Institute Corporation High Energy Accelerator Research Organization | Cryogenic heat conductor |
| GB2490424A (en) * | 2011-04-28 | 2012-10-31 | Kek High Energy Accelerator | Magnetic shield made from aluminium alloy with a purity of a least 99.999 % |
| DE102012008620A1 (en) | 2011-04-28 | 2012-10-31 | Inter-University Research Institute Corporation High Energy Accelerator Research Organization | Material for magnetic shielding of a superconducting magnet |
| GB2490423A (en) * | 2011-04-28 | 2012-10-31 | Kek High Energy Accelerator | Thermal conductor for superconductor made from high purity aluminium alloy |
| US20120273181A1 (en) * | 2011-04-28 | 2012-11-01 | Sumitomo Chemical Company, Limited | Low temperature thermal conductor |
| GB2490585A (en) * | 2011-04-28 | 2012-11-07 | Kek High Energy Accelerator | High purity aluminium material wire for strong magnetic field operation |
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| US9103005B2 (en) | 2011-04-28 | 2015-08-11 | Inter-University Research Institute Corporation High Energy Accelerator Research Organization | Magnetic shielding material for superconducting magnet |
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