JPS62270733A - Suction type vacuum degassing device - Google Patents
Suction type vacuum degassing deviceInfo
- Publication number
- JPS62270733A JPS62270733A JP11296986A JP11296986A JPS62270733A JP S62270733 A JPS62270733 A JP S62270733A JP 11296986 A JP11296986 A JP 11296986A JP 11296986 A JP11296986 A JP 11296986A JP S62270733 A JPS62270733 A JP S62270733A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- transfer pipe
- degassing
- suction type
- degassing device
- 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
- 238000009849 vacuum degassing Methods 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 238000007872 degassing Methods 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 239000007792 gaseous phase Substances 0.000 abstract 1
- 230000000644 propagated effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
［産業上の利用分野］
本発明は、溶融金属より脱ガスする真空す；１ガス装置
の改良に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an improvement in a vacuum system for degassing molten metal.
［従来の技術と問題点］
高温で溶融状態にある金属中には多量のガス例えば水素
などが溶解保持されており、このようなガスは凝固後も
脱けきれず、ミクロポロシティなどの内部欠陥として残
り、品質上程々な悪影響を及ぼす。このため、高温にお
いて溶解されているガスを鋳造前に除去するいわゆる脱
ガスが行なわれている。[Conventional technology and problems] A large amount of gas, such as hydrogen, is dissolved and retained in metals that are in a molten state at high temperatures, and these gases cannot be completely released even after solidification, causing internal defects such as microporosity. remains, and has a moderately negative effect on quality. For this reason, so-called degassing is carried out to remove gases dissolved at high temperatures before casting.
このような溶融金属中よりの脱ガス法には、種々な方法
があるが、真空脱ガス法がもつとも有効な方法の一つと
考えられている。そして、この真空脱ガス法にも種々な
方法があるが、簡便で効率のよい方法として、第３図に
示すような吸上げ式真空脱ガス装置を用いる方法があり
、広く実行されている。これは、溶湯４をとりぺ１より
移送管２を介して真空槽３内に吸上げ、この真空槽３内
において脱ガスしたのら、再びとりべ１に戻すものであ
る。この際の脱ガス能力は、溶湯が撹拌され溶湯の真空
に触れる面積が増大するほど向上するものであるこ仁は
、その構造上からも理解される。しかして、溶湯中の溶
解ガスの拡散速度は小ざく、このため溶湯中に溶解して
いるガスの放出速度は、液相−気相界面での表面積の増
大と共に増大し、液相表面近傍の流体境膜中の原子状と
なっている溶解ガスの濃度により律則される。従って、
脱ガス能力を向上せしめるためには、前記境膜となる部
分でのガスの濃度が可能な限り高濃度となり得るよう、
強制的に高い濃度のガス成分を当該境膜部分にたえず補
給してやるようにすることが望ましい。There are various methods for degassing the molten metal, but vacuum degassing is considered to be one of the most effective methods. There are various methods for this vacuum degassing method, but a method using a suction type vacuum degassing device as shown in FIG. 3 is a simple and efficient method and is widely practiced. In this system, the molten metal 4 is sucked up from the ladle 1 through the transfer pipe 2 into the vacuum chamber 3, degassed in the vacuum chamber 3, and then returned to the ladle 1 again. The degassing ability at this time is improved as the molten metal is stirred and the area of the molten metal that comes into contact with the vacuum increases.This fact can also be understood from its structure. However, the diffusion rate of dissolved gas in the molten metal is small, and therefore the release rate of the gas dissolved in the molten metal increases as the surface area at the liquid-vapor interface increases, and It is determined by the concentration of dissolved gas in atomic form in the fluid film. Therefore,
In order to improve the degassing ability, it is necessary to
It is desirable to continuously supply the membrane with a high concentration of gas components forcibly.
このような見地から、従来の吸上げ式服ガス装置をみた
場合、移送管２の内面２ａは、第４図に示すように平滑
な内面を有し、ここでの溶湯の流れにはほとんど乱れが
生じないため、前記のような撹拌能力を期待することは
できず、ガス成分の前記境膜への補給は、単なる自然対
流にまかされているのが実情でめった。From this point of view, when looking at the conventional suction type clothes gas apparatus, the inner surface 2a of the transfer pipe 2 has a smooth inner surface as shown in FIG. Since this does not occur, the above-mentioned stirring ability cannot be expected, and in reality, the replenishment of gas components to the boundary film is left to mere natural convection.
［発明の目的コ
本発明は、上記のような実情にかんがみてなされたもの
でおり、前記従来例のような自然対流にまかせることな
く、積極的に溶湯に撹拌力を与え、もって脱ガス能率を
一段と向上せしめ１ｑる吸上げ式真空脱ガス装置を提供
しようとするものである。[Purpose of the Invention] The present invention has been made in view of the above-mentioned circumstances, and it actively applies stirring power to the molten metal without relying on natural convection as in the conventional example, thereby improving degassing efficiency. The purpose of the present invention is to provide a suction type vacuum degassing device that further improves the efficiency.
［発明の概要］
すなわち、本発明の要旨とするところは、移送管の内面
に、平滑でなく、通過する溶湯の流れに乱れを生じせし
め得る凸部あるいは凹部を形成したことにあり、この凸
部あるいは凹部により他からの力を与えずに移送中の溶
湯に自らの撹拌力を与え、その後の真空槽内での脱ガス
能力を向上せしめたものである。[Summary of the Invention] That is, the gist of the present invention is that a convex portion or a concave portion that is not smooth and can cause turbulence in the flow of the molten metal passing through is formed on the inner surface of the transfer pipe. The agitating force of the molten metal is applied to the molten metal during transfer without applying any force from other sources, thereby improving the subsequent degassing ability within the vacuum chamber.
［実施例］ 以下に実施例に基づいて説明する。[Example] This will be explained below based on examples.
第１および２図は、本発明に係る脱ガス装置に使用され
る移送管２の２様の実施例を示す縦断面図であり６、第
１図は移送管２の内面にらせん状のフィン５を形成した
例を示し、第２図は同じく移送管２の内面にらじん状の
溝６を形成した例を示すものである。1 and 2 are longitudinal sectional views showing two embodiments of the transfer tube 2 used in the degassing device according to the present invention, and FIG. 1 shows a spiral fin on the inner surface of the transfer tube 2. FIG. 2 shows an example in which a radial groove 6 is formed on the inner surface of the transfer pipe 2.
このようならＵん状のフィン５必るいは溝６が形成され
ることにより、溶湯が移送管２内を通過する際に強制的
に渦巻状の流れが生じせしめられ、溶湯には強制的な撹
拌が促進され、前記した脱ガス効率が一段と向上するの
である。従って、装置そのものにはなんら大幅な構造上
の変更を与えることなく、移送管部分のみの交換をする
ことによって、脱ガス効率を向上できるものでおり、経
済的負担をほとんど伴うことなく効率の改善を果し得る
本発明の効用は、高く評価さるべきものというべきであ
る。In this case, by forming the U-shaped fins 5 or grooves 6, when the molten metal passes through the transfer pipe 2, a spiral flow is forcibly generated, and the molten metal is forced to have a spiral flow. Stirring is promoted, and the degassing efficiency described above is further improved. Therefore, the degassing efficiency can be improved by replacing only the transfer pipe section without making any major structural changes to the device itself, and the efficiency can be improved with almost no economic burden. The effectiveness of the present invention in achieving this should be highly evaluated.
なお、移送管内における上記凸部あるいは凹部の構成は
、あくまでも実施例として示すものであり、限定的構成
を意味するものではない。必要に応じ種々なる形状構成
の凸部あるいは凹部を形成せしめ得ることは勿論である
。Note that the configuration of the above-mentioned convex portions or concave portions in the transfer pipe is merely shown as an example, and does not mean a limiting configuration. Of course, it is possible to form convex portions or concave portions of various shapes and configurations as necessary.
このような移送管ないしフィンなどの材質は、溶湯によ
って浸されない、カーボン、セラミックスなどの高温耐
火物が適当である。As the material for such transfer pipes or fins, high-temperature refractories such as carbon and ceramics, which are not immersed in molten metal, are suitable.
実施例
無酸素銅の連続鋳造装置に本発明に係る吸上げ式真空脱
ガス装置を導入し、従来例によるものとの比較をした。EXAMPLE A suction type vacuum degassing device according to the present invention was introduced into a continuous casting device for oxygen-free copper, and compared with a conventional device.
移送管は、内径２５０＃、高ざ１９５０＃のカーボン製
円筒で内面平滑なものを従来構造の移送管とし、同じ構
成寸法よりなる円筒の内面に底辺３０ｍ、高さ３５ｍｍ
、らせんピッチ１００＃のフィンを形成したものを本発
明に係る移送管とした。The transfer pipe is a carbon cylinder with an inner diameter of 250mm and a height of 1950mm, and has a smooth inner surface.The transfer pipe has a conventional structure, and has a base of 30m and a height of 35mm on the inner surface of the cylinder with the same structural dimensions.
The transfer pipe according to the present invention was formed with fins having a helical pitch of 100#.
脱ガス処理は、−口約５００Ｋｇの溶湯を０．５Ｔｏｒ
ｒの真空度において、毎時２０回、１回当りの真空処理
時間２分３０秒、溶湯の吸上げ排出に３０秒の時間配分
をもって、毎時８０００に３の溶湯を脱ガスした。この
ときの溶湯に対してなんら脱ガス処理をぜずに鋳造した
鋳塊の水素濃度は１．０１）Ｉ）ｍであった。For degassing treatment, approximately 500 kg of molten metal is heated to 0.5 Torr.
The molten metal was degassed 20 times per hour at a vacuum degree of 8000 m/h, with a vacuum treatment time of 2 minutes and 30 seconds per time, and a time distribution of 30 seconds for sucking up and discharging the molten metal. The hydrogen concentration of the ingot, which was cast without any degassing treatment of the molten metal at this time, was 1.01)I)m.
これに対し、従来構造の移送管を有する脱ガス装置によ
り脱ガスした鋳塊の水素濃度は０．５〜０．６ｐｐｍで
あった。On the other hand, the hydrogen concentration of the ingot degassed by a degassing device having a conventional transfer pipe was 0.5 to 0.6 ppm.
そして、本発明に係る前記らせん状フィンを有する移送
管よりなる脱ガス装置により脱ガスした鋳塊の水素濃度
は０．３５〜０．４ｐｐｍであり、本発明に係る脱ガス
装置のすぐれた脱ガス能力を証明することができた。The hydrogen concentration of the ingot degassed by the degassing device comprising the transfer pipe having spiral fins according to the present invention is 0.35 to 0.4 ppm. We were able to prove our gas capabilities.
なお、具体例としてフィンや溝を設ける場合、上記例示
のように連続状態で形成するものに限らず、複数のもの
に分割した形状でもよく、らせんのピッチも一定ではな
い不等間隔なものあるいは複数のらせんあるいは溝の組
み合せになるものなどでもよく、フィンや溝の高さや深
さも一定ではない変化を与えたものであってもよい。As a specific example, when fins or grooves are provided, they are not limited to being formed continuously as in the above example, but may be divided into multiple pieces, and the spiral pitch may be unevenly spaced, or It may be a combination of a plurality of spirals or grooves, and the height and depth of the fins and grooves may also vary.
そしてまた、すでに述べたようにらせんや溝に限られず
、ほかの曲線状あるいは直線状あるいはこれらの組み合
せなど種々なる設計変更を行なっても効果の上での有意
差はないのである。Moreover, as already mentioned, there is no significant difference in effectiveness even if various design changes are made, such as not only spirals and grooves but also other curved shapes, straight shapes, or combinations thereof.
［発明の効果］
以上の通り、本発明に係る吸上げ式真空脱ガス装置によ
れば、移送管内を吸上げ移送される溶湯に他よりなんら
の力を与えることなく自動的に撹拌力を発生せしめ、そ
の撹拌力がそのまま真空槽内の溶湯に伝搬されて、溶湯
の液相−気相境界での脱ガス作用を一段と促進せしめ得
るものであって、脱ガス装置そのものに大きな構造状の
変更を与えることなく脱ガス効率を向上せしめ得た本発
明の意義はけだし大きなものがある。[Effects of the Invention] As described above, according to the suction type vacuum degassing apparatus according to the present invention, stirring force is automatically generated without applying any force to the molten metal being sucked up and transferred in the transfer pipe. The stirring force is directly transmitted to the molten metal in the vacuum chamber, further promoting the degassing effect at the boundary between the liquid phase and the gas phase of the molten metal, which requires major structural changes to the degassing device itself. The significance of the present invention, which has been able to improve the degassing efficiency without causing any problems, is enormous.
第１および２図は本発明に係る移送管の２様の実施例を
示す縦断面図、第３図は吸上げ式服ガス装置の具体例の
構成を示す説明図、第４図は従来の移送管の構成を示す
縦断面図でおる。
１・・・とりべ、
２・・・移送管、
３・・・真空槽、
４・・・溶湯、
５・・・らせん状フィン、
６・・・らせん状溝。
代理人 弁理士 佐 藤 不二雄
／Ｔ１ｆＪ
に
Ｉ′ｙｒｉｒ
ｌ二℃リマ
２− ｉ送テ
３： ３７禮
４： ５１ 情
５： うｔんＩ人７（ン
６・ ジｔん＃に購
２ｍ
４ｒｎ1 and 2 are longitudinal cross-sectional views showing two embodiments of the transfer pipe according to the present invention, FIG. 3 is an explanatory view showing the configuration of a specific example of a suction-type clothes gas device, and FIG. 4 is a conventional one. It is a longitudinal cross-sectional view showing the configuration of a transfer pipe. 1... Ladle, 2... Transfer pipe, 3... Vacuum tank, 4... Molten metal, 5... Spiral fin, 6... Spiral groove. Agent Patent Attorney Fujio Sato/T1fJ 2C Lima 2-i Sent 3: 37 4: 51 Information 5: Utn I person 7
Claims (3)
において、溶融金属を吸い上げる移送管の内側に溶湯の
流れに乱れを生じせしめ得る凸部あるいは凹部を形成し
てなる吸上げ式真空脱ガス装置。(1) In a device for degassing molten metal by sucking it up into a vacuum chamber, a suction type vacuum degassing device has a convex part or a concave part that can cause turbulence in the flow of the molten metal on the inside of the transfer pipe that sucks up the molten metal. gas equipment.
特許請求の範囲第１項記載の真空脱ガス装置。(2) The vacuum degassing device according to claim 1, wherein a spiral fin is formed inside the transfer pipe.
請求の範囲第１項記載の真空脱ガス装置。(3) The vacuum degassing device according to claim 1, wherein a spiral groove is formed inside the transfer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11296986A JPS62270733A (en) | 1986-05-16 | 1986-05-16 | Suction type vacuum degassing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11296986A JPS62270733A (en) | 1986-05-16 | 1986-05-16 | Suction type vacuum degassing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62270733A true JPS62270733A (en) | 1987-11-25 |
Family
ID=14600081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11296986A Pending JPS62270733A (en) | 1986-05-16 | 1986-05-16 | Suction type vacuum degassing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62270733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010015242A1 (en) * | 2008-08-07 | 2010-02-11 | Sms Siemag Aktiengesellschaft | Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method |
| KR20160071702A (en) * | 2014-12-12 | 2016-06-22 | 주식회사 포스코 | Vacuum Treating Apparatus |
-
1986
- 1986-05-16 JP JP11296986A patent/JPS62270733A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010015242A1 (en) * | 2008-08-07 | 2010-02-11 | Sms Siemag Aktiengesellschaft | Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method |
| US20110179909A1 (en) * | 2008-08-07 | 2011-07-28 | Odenthal Hans-Juergen | Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method |
| RU2468092C2 (en) * | 2008-08-07 | 2012-11-27 | Смс Симаг Акциенгезельшафт | Supply sleeve for degassing reservoir for metallurgical melts operating using rh method |
| KR20160071702A (en) * | 2014-12-12 | 2016-06-22 | 주식회사 포스코 | Vacuum Treating Apparatus |
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