JPS63289099A - Method of treating lubricating oil - Google Patents
Method of treating lubricating oilInfo
- Publication number
- JPS63289099A JPS63289099A JP62125049A JP12504987A JPS63289099A JP S63289099 A JPS63289099 A JP S63289099A JP 62125049 A JP62125049 A JP 62125049A JP 12504987 A JP12504987 A JP 12504987A JP S63289099 A JPS63289099 A JP S63289099A
- Authority
- JP
- Japan
- Prior art keywords
- lubricating oil
- oil
- emulsion
- treating
- fluidity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000839 emulsion Substances 0.000 claims abstract description 20
- 239000003921 oil Substances 0.000 claims abstract description 20
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000010731 rolling oil Substances 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 7
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- 150000004665 fatty acids Chemical class 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 239000007762 w/o emulsion Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 238000005491 wire drawing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005555 metalworking Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000003995 emulsifying agent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007764 o/w emulsion Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- ICLYJLBTOGPLMC-KVVVOXFISA-N (z)-octadec-9-enoate;tris(2-hydroxyethyl)azanium Chemical compound OCCN(CCO)CCO.CCCCCCCC\C=C/CCCCCCCC(O)=O ICLYJLBTOGPLMC-KVVVOXFISA-N 0.000 description 1
- 241000862632 Soja Species 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Lubricants (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明はエマルジョンタイプの潤滑油の処理方法に関す
るものであって、該潤滑油が金属加工中に流動性を失っ
てクリーム状になった場合に、迅速かつ経済的に流動性
を回復させる方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for treating emulsion-type lubricating oil, which is used when the lubricating oil loses fluidity and becomes creamy during metal processing. and how to restore liquidity quickly and economically.
圧延、伸線、プレス等の金属加工には、一般に油を水に
分散させて水中油型のエマルジョン状態にした潤滑油が
使用されている。該潤滑油は使用時間が長くなるとエマ
ルジョンが不安定になり、油分中に水が分散した状態の
エマルジョン或いは前記油中水型のエマルジョンが油中
に包含された型のエマルジョンとなって粘性が増加し、
流動性が低下してクリーム状となる。BACKGROUND ART In metal processing such as rolling, wire drawing, and pressing, a lubricating oil in which oil is dispersed in water to form an oil-in-water emulsion is generally used. When the lubricating oil is used for a long time, the emulsion becomes unstable and becomes an emulsion in which water is dispersed in the oil or an emulsion in which the water-in-oil emulsion is included in the oil, and the viscosity increases. death,
The fluidity decreases and it becomes creamy.
前記クリーム状となった潤滑油は油タンク及び配管内に
停滞し、例えば圧延油の場合は圧延ロールへの噴射が不
可能となって圧延作業が中止される。この場合生産現場
においては、迅速かつ経済的に圧延作業を再開すること
が必要であり、従来は下記（１）〜（３）の方法により
圧延作業を再開していた。The creamy lubricating oil stagnates in the oil tank and piping, and in the case of rolling oil, for example, it becomes impossible to inject it to the rolling rolls, and the rolling operation is stopped. In this case, at the production site, it is necessary to restart the rolling operation quickly and economically, and conventionally, the rolling operation has been restarted by the following methods (1) to (3).
（１）物理的な方法でクリーム状の潤滑油を取り除き、
油タンク及び配管内を洗浄した後、新たに潤滑油を作製
する。(1) Remove creamy lubricant by physical method,
After cleaning the inside of the oil tank and piping, prepare new lubricating oil.
（２）大量の水を加えながら撹拌してクリーム状の潤滑
油を軟らかくし、これを排出口より廃棄した後油タンク
及び配管内を洗浄し、新たに潤滑油を作製する。(2) Add a large amount of water and stir to soften the creamy lubricating oil, discard it from the outlet, and then clean the inside of the oil tank and piping to make new lubricating oil.
（３）乳化剤を多量に加え、更に水を加えて撹拌して水
中油型のエマルジョン状態にし、これを排出口より廃棄
した後油タンク及び配管内を洗浄し、新たに潤滑油を作
製する。(3) Add a large amount of emulsifier, then add water and stir to form an oil-in-water emulsion. After discarding this from the outlet, clean the oil tank and piping to make new lubricating oil.
近年圧延機等の大型化に伴って、金属加工に使用される
潤滑油の量は益々多くなる傾向にあり、例えば／ｌ系材
料の熱間圧延においては、総社ｌＯＯ〜５００＆ｆの潤
滑油が使用されている。この様に多量の潤滑油がクリー
ム状になった場合に、これを前記従来の方法により処理
しようとすると、（１）処理が完了し、再圧延が可能に
なる迄に１〜５日かかる。In recent years, as rolling mills have become larger, the amount of lubricating oil used in metal processing has tended to increase.For example, in the hot rolling of /l-based materials, lubricating oils from Soja lOO~500&f are used. has been done. When such a large amount of lubricating oil becomes creamy and it is attempted to be treated by the conventional method, (1) it takes 1 to 5 days until the treatment is completed and re-rolling is possible.
（２）流動性が低下したエマルジョンの撹拌が困難であ
る。(2) It is difficult to stir an emulsion with reduced fluidity.
（３）不用の潤滑油の廃棄及び新しい潤滑油の作製のた
めに経費が２重にかかる。(3) Expenses are doubled due to the disposal of unnecessary lubricating oil and the production of new lubricating oil.
等の問題があり、迅速性、経済性共に満足させることが
出来なかった。Due to these problems, it was not possible to satisfy both speed and economy.
本発明は上記の点に鑑みなされたものであり、その目的
とするところは、エマルジョンタイプ潤滑油が流動性を
失ってクリーム状になり、圧延等の金属加工が不可能に
なった場合に、迅速かつ経済的に前記潤滑油の流動性を
回復させる方法を提供することである。The present invention was made in view of the above points, and its purpose is to prevent emulsion-type lubricating oil from losing its fluidity and becoming cream-like, making metal processing such as rolling impossible. The object of the present invention is to provide a method for quickly and economically restoring the fluidity of the lubricating oil.
即ち本発明は、油分を水に分散させてエマルジョン状態
にした潤滑油において、該潤滑油の流動性が低下した際
に、５０ρρ−を超え、２０００ρｐ−未満の濃度のト
リエタノールアミンを添加することを特徴とする潤滑油
の処理方法である。That is, the present invention provides a method for adding triethanolamine at a concentration of more than 50 p- and less than 2000 p- when the fluidity of the lubricating oil is reduced in a lubricating oil made by dispersing oil in water to form an emulsion. This is a lubricating oil processing method characterized by the following.
本発明の処理方法が適用される潤滑油は、通常鉱物油、
脂肪酸、界面性活性剤からなる油分を水に分散させてエ
マルジョン状態にした潤滑油であり、特に該脂肪酸がオ
レイン酸である場合に本発明の処理方法の効果が大きい
。The lubricating oil to which the treatment method of the present invention is applied is usually mineral oil,
This lubricating oil is an emulsion obtained by dispersing an oil component consisting of a fatty acid and a surfactant in water, and the treatment method of the present invention is particularly effective when the fatty acid is oleic acid.
又前記潤滑油が、使用量が多い／ｌ系又はＣｕ系材料用
熱間圧延油である場合に、特に本発明の効果が大きいが
、冷間圧延油或いは伸線油、プレス油等に対しても本発
明の処理方法を適用することが出来る。The effect of the present invention is especially great when the lubricating oil is hot rolling oil for L-based or Cu-based materials, which is used in a large amount; The processing method of the present invention can also be applied to
更に本発明の処理方法が適用される潤滑油の流動性が低
下した状態は、油中に水が分散した状態のエマルジョン
、前記油中水型のエマルジョンが油中に包含された型の
エマルジョンの内のいずれであっても差し支えない。Furthermore, the state in which the fluidity of the lubricating oil to which the treatment method of the present invention is applied is an emulsion in which water is dispersed in the oil, or an emulsion in which the water-in-oil emulsion is included in the oil. Any of the above is acceptable.
本発明において、流動性が低下した潤滑油に添加するト
リエタノールアミンの濃度を５０ρρｍを超え、２００
０ρｐｍ未満の範囲内に限定したのは、ｓｏｐｐｎ＋以
下では流動性の回復が不充分であり、２０００ρｐｍ以
上にするとエマルジョンの粒子が細かくなりすぎて潤滑
性が低下するためである．またトリエタノールアミンを
潤滑油に添加すると共に、ポンプ、ミキサー等により該
潤滑油を撹拌することにより、一層迅速に流動性を回復
させることが可能である。In the present invention, the concentration of triethanolamine added to the lubricating oil with reduced fluidity exceeds 50ρρm, and
The reason why it is limited to a range of less than 0 ρpm is that recovery of fluidity is insufficient if it is less than soppn+, and if it is more than 2000 ρpm, the emulsion particles become too fine and the lubricity deteriorates. Further, by adding triethanolamine to the lubricating oil and stirring the lubricating oil using a pump, mixer, etc., fluidity can be restored more quickly.
（作用〕
本発明の潤滑油の処理方法においては、流動性が低下し
てクリーム状になった潤滑油にトリエタノールアミンを
添加することにより、該トリエタノールアミンが潤滑油
の構成成分として存在する脂肪酸特にオレイン酸と化合
して乳化剤（トリエタノールアミンオレイン酸石けん）
を生成し、生成部分のクリームをエマルジョン（水中浦
型）に変化させる。流動化した部分の近傍のクリームも
同様の過程を経てエマルジョン化し、次第に全系に伝播
して最終的には全系がエマルジョンに変化する。(Function) In the method for treating lubricating oil of the present invention, triethanolamine is added to the lubricating oil that has become creamy due to decreased fluidity, so that the triethanolamine is present as a component of the lubricating oil. Emulsifying agent when combined with fatty acids, especially oleic acid (triethanolamine oleic acid soap)
The cream in the generated part is transformed into an emulsion (Mizuura type). The cream in the vicinity of the fluidized part also becomes an emulsion through a similar process, which gradually spreads to the entire system, and finally the entire system turns into an emulsion.
前記エマルジョンの過程は、ポンプ等による撹拌を併用
することにより更に迅速になり、例えばＡ２系材料の熱
間圧延油においては、総１３５０ｋｌの場合約１時間以
内に流動化を完了させることが可能である。The emulsion process can be made more rapid by using stirring with a pump, etc. For example, in the case of hot rolling oil for A2 type materials, it is possible to complete fluidization within about 1 hour in the case of a total of 1350 kl. be.
次に本発明を実施例により更に具体的に説明する。 Next, the present invention will be explained in more detail with reference to Examples.
本発明の実施に用いたのは、クリーム状になったアルミ
ニウム熱間圧延油であって、水９０部に油分が１０部混
合されたものであり、該油分の構成は鉱物油８５部、脂
肪酸１０部、ノニオン系及びナトリウムスルフォネート
界面活性剤が５部であり、圧延油温度５０゛Ｃで熱間圧
延作業を繰返した後に流動性を失ったものである。前記
圧延油（総置３５０Ｗ）にトリエタノールアミンを濃度
を変えて添加し、流動性が回復する迄の時間を測定する
と共に、流動性が回復した場合のエマルジョンの性状（
粒径）を評価してその結果を第１表に示した。The creamy aluminum hot-rolling oil used in the practice of the present invention was a mixture of 90 parts of water and 10 parts of oil, and the composition of the oil was 85 parts of mineral oil and fatty acids. 10 parts and 5 parts of nonionic and sodium sulfonate surfactants, which lost fluidity after repeated hot rolling operations at a rolling oil temperature of 50°C. Triethanolamine was added at varying concentrations to the rolling oil (350 W in total), the time until fluidity was restored was measured, and the properties of the emulsion when fluidity was restored (
The results are shown in Table 1.
第１表から明らかな様に、トリエタノールアミンの濃度
が本発明の範囲内である本発明例障１〜５においては、
３０ｗ１ｎ〜８ｈｒの間に流動性が回復しており、エマ
ルジョンの性状も良好で圧延油として再使用可能であっ
た。As is clear from Table 1, in Examples 1 to 5 of the present invention in which the concentration of triethanolamine is within the range of the present invention,
The fluidity was recovered between 30w1n and 8hr, and the emulsion had good properties and could be reused as rolling oil.
一方トリエタノールアミンの濃度が本発明の範囲内より
も低い比較例Ｎα６は２４ｈｒ経過しても流動性が回復
しなく、又該トリエタノールアミンの濃度が本発明の範
囲内よりも高い比較例Ｎα７は、流動性は短時間で回復
するものの、エマルジョンの粒子が細かくなりすぎて潤
滑性が低下し、圧延油としての性能が不充分であった。On the other hand, in Comparative Example Nα6, in which the concentration of triethanolamine is lower than the range of the present invention, the fluidity does not recover even after 24 hours, and in Comparative Example Nα7, the concentration of triethanolamine is higher than the range of the present invention. Although the fluidity was restored in a short time, the particles of the emulsion became too fine and the lubricity decreased, resulting in insufficient performance as a rolling oil.
〔比較例）
比較のため、実施例で用いたのと同し熱間圧延油に対し
て、従来行なわれていた様に、水にて２倍に希釈後乳化
剤としてスルホン酸ナトリウム塩を１％添加し、ミキサ
ーで撹拌した。その結果、流動性は０．５ｈｒで回復し
たが、エマルジョンの粒子が細かくなりすぎて潤滑性が
低下し、圧延油としての性能が不充分であった。[Comparative example] For comparison, the same hot rolling oil used in the example was diluted with water to 2 times the original amount, and then 1% sodium sulfonate was added as an emulsifier. and stirred with a mixer. As a result, although the fluidity was restored in 0.5 hr, the particles of the emulsion became too fine and the lubricity decreased, resulting in insufficient performance as a rolling oil.
〔発明の効果］
本発明の処理方法によれば、エマルジョンタイプの潤滑
油が流動性を失ってクリーム状になった場合に、迅速か
つ経済的に該潤滑油の流動性を回復させることが可能で
あり、中断された金属加工を速やかに再開することが出
来る等工業上顕著な効果を奏するものである。[Effects of the Invention] According to the treatment method of the present invention, when an emulsion-type lubricating oil loses its fluidity and becomes cream-like, it is possible to quickly and economically restore the fluidity of the lubricating oil. This has significant industrial effects, such as being able to quickly resume interrupted metal processing.
Claims (10)
滑油において、該潤滑油の流動性が低下した際に、５０
ｐｐｍを超え、２０００ｐｐｍ未満の濃度のトリエタノ
ールアミンを添加することを特徴とする潤滑油の処理方
法。(1) In a lubricating oil that is made into an emulsion by dispersing oil in water, when the fluidity of the lubricating oil decreases,
A method for treating lubricating oil, which comprises adding triethanolamine at a concentration of more than ppm and less than 2000 ppm.
か１種であることを特徴とする特許請求の範囲第１項記
載の潤滑油の処理方法。(2) The method for treating lubricating oil according to claim 1, wherein the lubricating oil is any one of rolling oil, wire drawing oil, and press oil.
請求の範囲第２項記載の潤滑油の処理方法。(3) The method for treating lubricating oil according to claim 2, wherein the rolling oil is hot rolling oil.
とを特徴とする特許請求の範囲第１項記載の潤滑油の処
理方法。(4) The method for treating lubricating oil according to claim 1, wherein the lubricating oil is a lubricating oil for Al-based or Cu-based materials.
を特徴とする特許請求の範囲第１項記載の潤滑油の処理
方法。(5) The method for treating lubricating oil according to claim 1, wherein the oil component consists of mineral oil, fatty acid, and surfactant.
請求の範囲第５項記載の潤滑油の処理方法。(6) The method for treating lubricating oil according to claim 5, wherein the fatty acid is oleic acid.
て潤滑油の流動性が低下したことを特徴とする特許請求
の範囲第１項記載の潤滑油の処理方法。(7) The method for treating lubricating oil according to claim 1, characterized in that the fluidity of the lubricating oil is reduced by forming an emulsion in which water is dispersed in the oil.
型のエマルジョンとなって潤滑油の流動性が低下したこ
とを特徴とする特許請求の範囲第１項記載の潤滑油の処
理方法。(8) The method for treating lubricating oil according to claim 1, characterized in that the water-in-oil emulsion becomes an emulsion encapsulated in oil, and the fluidity of the lubricating oil is reduced. .
を撹拌することを特徴とする特許請求の範囲第１項記載
の潤滑油の処理方法。(9) The method for treating lubricating oil according to claim 1, which comprises adding triethanolamine and stirring the lubricating oil.
うことを特徴とする特許請求の範囲第９項記載の潤滑油
の処理方法。(10) The method for treating lubricating oil according to claim 9, wherein the lubricating oil is stirred by a pump or a mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125049A JPS63289099A (en) | 1987-05-22 | 1987-05-22 | Method of treating lubricating oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125049A JPS63289099A (en) | 1987-05-22 | 1987-05-22 | Method of treating lubricating oil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63289099A true JPS63289099A (en) | 1988-11-25 |
Family
ID=14900566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62125049A Pending JPS63289099A (en) | 1987-05-22 | 1987-05-22 | Method of treating lubricating oil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63289099A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020105450A (en) * | 2018-12-28 | 2020-07-09 | 大同化学工業株式会社 | Oil composition for aluminum hot rolling and method of hot rolling aluminum |
-
1987
- 1987-05-22 JP JP62125049A patent/JPS63289099A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020105450A (en) * | 2018-12-28 | 2020-07-09 | 大同化学工業株式会社 | Oil composition for aluminum hot rolling and method of hot rolling aluminum |
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