JPS5850161A - Method and device for sealing of joined part for sealed casting - Google Patents

Abstract

PURPOSE:To improve the quality of casting and to obtain products meeting prescribed standards by using a sealing layer of ejecting inert gas for the atmospheric sealing in the joined part between a nozzle below a ladle and a sealing pipe. CONSTITUTION:A nozzle holder 3 is installed on the outer side above a cylindrical atmospheric sealing pipe 2 in press contact with a nozzle 1 for outflow of molten steel provided below a ladle. A torus-shaped header 5 is provided in the outside circumferential part and an aperture 9 is provided above the inner side thereof. Supply ports 6, 6 for inert gas are provided on the outer side. The inert gas A supplied through the port 6, 6 connected to the header 5, a connecting pipe 7 and a gas supply pipe 8 is ejected toward the center of the nozzle 1 in the upper part along the generator direction of the imaginary circular cone shape of the aperture 9 of the header 5 through said aperture to form a membrane sealing layer B of the gas A continuously, whereby the inclusion of the atmospheric air by drafts during the outflow of the molten steel C is prevented and the atmospheric sealing in the joined part is accomplished perfectly.

Description

【発明の詳細な説明】 本発明は溶鋼から厚板を連続鋳造する際に、取鍋ノズル
より大気シールパイプを介してタンディツシュに移送す
る鋳造法において、取鍋ノズルと大気シールパイプとの
シール鋳造接合部におけるシール方法及び同装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for continuous casting of thick plates from molten steel, in which the casting method involves transferring the steel plate from the ladle nozzle to the tundish via the atmospheric seal pipe. The present invention relates to a sealing method and device for a joint.

従来、この種のシール方法としては、取鍋ノズルに大気
シールパイプを堰付け、その接合部に耐火モルタルを充
填したりしてンールしていたが、こうした大気シールパ
イプを取鍋ノズルに取付けることは、鋳造作業上の障害
となったり、パイプの折損事故をおこしたり、取付は取
外し作業に時間を要するなどの問題が生じていたため、
かかるロスを解消するのに、取鍋下方のノズルに大気シ
ールノズルを圧接し、且つ地外しや移動が簡単に行える
圧接法が開発された。Conventionally, this type of sealing method involved attaching an atmospheric seal pipe to the ladle nozzle and filling the joint with refractory mortar. This caused problems such as hindrance to casting work, pipe breakage accidents, and time-consuming installation and removal work.
In order to eliminate this loss, a pressure welding method was developed in which an atmospheric seal nozzle is pressure-welded to the nozzle below the ladle, and the nozzle can be easily removed from the ground and moved.

しかしながら、この圧接法は簡単に圧接し堰付は増外し
が行われるため、これの接合部分の大気７−ルにしばし
ば問題ソ；生じτいた。即ちこの接合部′分は常に高温
で且つ環境条件の悪い所であり、取付は取外し作業によ
る機器破損も多くて完全に′−″することはぐか４か困
難でありた・２″ため例えばバネ鋼のような高級特殊鋼
を鋳造する際などは、大気シール年子、盆による大気中
のＮ、、　ＯＪＬが溶鋼に混入し、製品に割れを生じた
シ、表面きずを形成したりして規格の許容範囲をこえる
ことも生じ、連続して大量生産する上での大きな障害と
なっていた。However, since this pressure welding method is easy to weld and the weir attachment is added or removed, problems often arise in the atmosphere at the welding portion. In other words, this joint is always at a high temperature and under poor environmental conditions, and it is extremely difficult to completely remove the device due to the installation and removal work. When casting high-grade special steel such as steel, atmospheric sealants, N, and OJL from the atmosphere may mix into the molten steel, causing cracks and surface scratches in the product. In some cases, the tolerance range of the standard was exceeded, which was a major obstacle to continuous mass production.

本発明はこうした欠点を除去し、大気シールパイプを支
持するパイプ受けの上方外周部分のヘッダーより、中心
上方に向けて噴出させた不活性ガスの膜シール層を連続
形成して接合部のシールを完全にするシール方法及び同
装置を提供するもので、以下図面に基づき本発明に係る
実施例を説明する。The present invention eliminates these drawbacks and seals the joint by continuously forming a film sealing layer of inert gas that is blown upward from the header on the upper outer periphery of the pipe receiver that supports the atmospheric seal pipe. Embodiments of the present invention will be described below with reference to the drawings, which provide a complete sealing method and device.

取−の下方には、周知の構造をなす（説明省略）溶鋼流
出用のノズル１が設けてあり、該ノズル１に下方より耐
火レンガ環の円筒状の大気シールパイプ２が圧接される
。該大気シールパイプ２はその曲大部をなす上方外側方
をパイプ受け３にて支持され、さらにパイプ受け３の側
方には対称にのびる支持金具４，４が設置される。そし
てノズル１への大気シでルバイプ２の増付は取外冒、ノ
ズル受け８の支持金具４，４を介して油圧装置（図示せ
ず）等の作動により行うものである。A molten steel outflow nozzle 1 having a well-known structure (description omitted) is provided below the receptacle, and a cylindrical atmospheric seal pipe 2 made of a refractory brick ring is pressed into contact with the nozzle 1 from below. The atmospheric seal pipe 2 is supported by a pipe receiver 3 at its upper and outer side, which forms a curved portion thereof, and support fittings 4, 4 extending symmetrically are installed on the sides of the pipe receiver 3. The attachment of the atmospheric pipe 2 to the nozzle 1 is performed by removing it and operating a hydraulic device (not shown) or the like via the support fittings 4 of the nozzle receiver 8.

またパイプ受け３の上方外周部には円環状のヘッダー５
が設置され、１畔ヘツダー５の内側上方には仮想円錐面
の母線方向に向う開孔９が一様に設けてあり、さらにヘ
ッダー５の外側方には等角度位置に２箇所の不−活性ガ
ス供給口６．６が設置され、このガス供給口６，６を連
結する連結管７及びその中央に不活性ガス供給管８とそ
れぞれ設置して本ノール鋳造接合部のシール装置は構成
されている。In addition, an annular header 5 is provided on the upper outer periphery of the pipe receiver 3.
are installed, and openings 9 facing the generatrix direction of the imaginary conical surface are uniformly provided at the upper inner side of the header 5, and two inert holes are provided at equal angular positions on the outer side of the header 5. A gas supply port 6.6 is installed, a connecting pipe 7 connecting the gas supply ports 6, 6, and an inert gas supply pipe 8 are installed in the center of the connecting pipe 7, and the sealing device of the knoll casting joint is constructed. There is.

従って取鍋の下方ノズル１がら大気シールパイプ２を介
して溶鋼Ｃを下方のタンディツシュに移送する鋳造法に
おいて、ノズル１表これに圧接したソールパイプ２との
間の接合部の大気シールを行うＫは、シールパイプ２の
上縁に設けたパイプ受け３の外周部に設置した・ヘッダ
ー５に連結したところのガス供給口６，６、連結管７及
びガス供給管８を介して供給される不活性ガスＡ（例え
ばアルゴンガス）を、ヘッダー５の開孔９がらその仮性
円錐面の母線方向に沿って上方ノズル１Ω中心に向けて
噴出させ、不活性ガスＡの膜シール層Ｂを連続形成させ
て、溶鋼Ｃの流出時におけるドラフトによる大気混入を
防止し接合部の大気シールを完全にする如くする。Therefore, in the casting method in which molten steel C is transferred from the lower nozzle 1 of the ladle to the lower tundish via the atmospheric seal pipe 2, the atmosphere sealing is performed at the joint between the nozzle 1 and the sole pipe 2 pressed into contact with it. The gas is supplied through the gas supply ports 6, 6, the connecting pipe 7 and the gas supply pipe 8, which are connected to the header 5 and installed on the outer periphery of the pipe receiver 3 provided on the upper edge of the seal pipe 2. Active gas A (for example, argon gas) is ejected from the opening 9 of the header 5 along the generatrix direction of the pseudoconical surface toward the center of the upper nozzle 1Ω to continuously form a film sealing layer B of the inert gas A. This prevents the molten steel C from entering the atmosphere due to the draft when it flows out, and completely seals the joint at the atmosphere.

その際ヘッダー５に供給される不活性ガスＡは、その供
給口６を２箇所に設けているため、流速を遅めヘッダー
５内圧力を均一に保ち、常に噴出する不活性ガスＡによ
る膜シール層形成を一様に保つ如く構成されている。尚
、前記溶鋼Ｃによる接合部のドラフトは一２０１ＭＨ，
Ｏ程度であるため、前記不活性ガスＡの供給量は僅かで
よいと考えられる。At this time, the inert gas A supplied to the header 5 has two supply ports 6, so the flow rate is slowed down to keep the pressure inside the header 5 uniform, and the inert gas A constantly spouts out to seal the membrane. The structure is such that layer formation is maintained uniformly. Note that the draft of the joint by the molten steel C is -201MH,
Since the amount of the inert gas A is approximately O, it is considered that the amount of the inert gas A to be supplied may be small.

次に本シール方法及び同装置によシ行った具体例を説明
すると、圧力５　ｋｑ　／　ｄ　ＧのアルゴンガスＡを
、内径１８ＭＭ　のガス供給口６を介して、容積５０ｎ
／でその円、環状内径２２５Ｈφのヘッダー５の上方内
側に設けた１朋巾位の開孔９より噴出させるのに、少し
ずつ供給量を絞っていき、最後はアルゴンガス使用量Ｑ
　、　ｌ　ｎ／／ｎＭ　ｎ　　で十分にシールの目的を
達成できることを確めた。Next, to explain a specific example of this sealing method and the same apparatus, argon gas A with a pressure of 5 kq/dG is supplied through a gas supply port 6 with an inner diameter of 18 mm to a volume of 50 n.
/ In order to eject air from the 1-width hole 9 provided above and inside the header 5 with an annular inner diameter of 225Hφ, the supply amount is gradually reduced until the amount of argon gas used is Q.
, l n//nM n was confirmed to be sufficient to achieve the purpose of sealing.

上述した如く、本発明に係るシール鋳造接合部のシール
方法は、取鍋の下方ノズル１から大気シールパイプ２を
介して溶鋼Ｃをタンディツシュに移送する鋳造法におい
て、前記ノズル１とシールパイプ２との間における接合
部の大気シールを、シールパイプ２上縁に設けたパイプ
受け８の外周部にあるヘッダー５から仮想円錐面の母線
に沿って中心上方に噴出する不活性ガスのシール層によ
って行うものである。As described above, the method for sealing a seal casting joint according to the present invention is a casting method in which molten steel C is transferred from a lower nozzle 1 of a ladle to a tundish through an atmospheric seal pipe 2, in which the nozzle 1 and the seal pipe 2 are connected to each other. Atmospheric sealing of the joint between the seal pipes 2 and 2 is performed by a sealing layer of inert gas that is ejected upward from the center along the generatrix of the virtual conical surface from the header 5 located on the outer periphery of the pipe receiver 8 provided on the upper edge of the seal pipe 2. It is something.

またこの発明に係るシール装置は、取鍋の下方に設けた
溶鋼流出用のノズル１に圧接され先日筒状の大気シール
パーイブ２の上方外側方にノズル受け３を設置し、この
ノズル受け３の上方外周部に円環状ヘッダー５を設け、
このヘッダー５内側上方に仮想円錐面の母線方向に向う
開孔９を設け、またヘッダー５の外側方に等角度間隔で
不活性ガス供給口６．６を設けて構成されている。Further, the sealing device according to the present invention includes a nozzle receiver 3 installed above and outwardly from a cylindrical atmospheric sealing pipe 2 that is pressed into contact with a nozzle 1 for discharging molten steel provided below the ladle. An annular header 5 is provided on the outer periphery,
Openings 9 are provided inside and above the header 5 facing in the generatrix direction of the virtual conical surface, and inert gas supply ports 6.6 are provided at equal angular intervals on the outside of the header 5.

このように本発明は溶鋼をシール−鋳造する接合部に、
大気の混入を防ぐ不活性ガスによる一様な膜シール層を
連続して形成することができるため、各種鋳造製品の品
質を高め、所定規格の優秀な製品を作る上で大きな効果
を有するものである。In this way, the present invention provides a joint where molten steel is sealed and cast.
Since it is possible to continuously form a uniform sealing layer of inert gas that prevents air from entering, it has a great effect on improving the quality of various casting products and producing excellent products that meet the specified specifications. be.

【図面の簡単な説明】[Brief explanation of the drawing]

図面はこの発明に係るシール鋳造接合部のシール装置及
びシール方法を説明するもので、第１図は該接合部周辺
の要部側断面図、第２図は第１図Ｄ−Ｄ矢視図を示す。 １　　取鍋下方ノズル ２　　大気シールバネ／ ８　　パイプ受け ５　　へラダー ６　　ガス供給口 ９　　開孔The drawings are for explaining a sealing device and a sealing method for a seal casting joint according to the present invention, and FIG. 1 is a sectional side view of a main part around the joint, and FIG. 2 is a view taken along the line D-D in FIG. 1. shows. 1 Ladle lower nozzle 2 Atmospheric seal spring / 8 Pipe receiver 5 Ladder 6 Gas supply port 9 Opening

Claims (1)

【特許請求の範囲】 １　取鍋の下方ノズルから大気シールパイプを介して溶
鋼をタンディツシュに移送する鋳造法において、前記ノ
ズルとシールパイプとの間における接合部の大気シール
を、シールパイプ上縁に設けたパイプ受けの外周部にあ
るヘッダーから仮想円錐面の母線に沿って中心上方に噴
出する不活性ガスのシール層によって行うことを特徴と
するシール鋳造接合部のシール方法。 ２　取鍋の下方に設けた溶鋼流出用のノズルに圧接され
た円筒状の大気シールパイプの上方外側方にパイプ受け
を設置し、このパイプ受は上方外周部に円環状ヘッダー
を設け、このヘッダー内側１一方に仮想円錐面の母線方
向に向う開孔を設け、またヘッダーの外側方に等角度間
隔で不活性ガス供給口を設けて々るシール鋳造接合部の
シール装置０[Claims] 1. In a casting method in which molten steel is transferred from a lower nozzle of a ladle to a tundish through an atmospheric seal pipe, an atmospheric seal at the joint between the nozzle and the seal pipe is placed on the upper edge of the seal pipe. A method for sealing a seal casting joint, characterized in that sealing is performed using a sealing layer of inert gas that is ejected upward from the center along the generatrix of an imaginary conical surface from a header on the outer periphery of a provided pipe receiver. 2. A pipe receiver is installed above and outwardly of a cylindrical atmospheric seal pipe that is pressed into contact with a nozzle for discharging molten steel provided below the ladle. Sealing device 0 for a seal casting joint in which openings are provided on one side of the inside 1 facing toward the generatrix of the virtual conical surface, and inert gas supply ports are provided at equal angular intervals on the outside of the header.