JPH0115342B2 - - Google Patents
Info
- Publication number
- JPH0115342B2 JPH0115342B2 JP55135655A JP13565580A JPH0115342B2 JP H0115342 B2 JPH0115342 B2 JP H0115342B2 JP 55135655 A JP55135655 A JP 55135655A JP 13565580 A JP13565580 A JP 13565580A JP H0115342 B2 JPH0115342 B2 JP H0115342B2
- Authority
- JP
- Japan
- Prior art keywords
- slit
- gas permeable
- forming
- nozzle
- permeable body
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Description
【発明の詳細な説明】
この発明はスリツトを有する鋳造用ノズルの製
造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a casting nozzle having a slit.
連続鋳造用浸漬ノズルは当初溶融石英質のもの
が多用されていたが、近年多連々鋳用として耐食
性に優れたアルミナ・カーボン質が多用されるよ
うになつたが、Alの多い鋼を鋳造する場合、ア
ルミナ・カーボン質ノズルは内孔（流出孔とも云
う）にAl3O3の析出が付着し、長時間使用される
に従いAl2O3の析出物付着がますます多くなり、
ついにはノズル孔（流出孔とも云う）を閉塞する
におよび鋳造不能となる。 Initially, immersion nozzles for continuous casting were often made of fused silica, but in recent years alumina/carbon, which has excellent corrosion resistance, has come to be used frequently for continuous casting. In the case of alumina-carbon nozzles, Al 3 O 3 precipitates adhere to the inner hole (also called the outflow hole), and as the alumina/carbon nozzle is used for a long time, more and more Al 2 O 3 precipitates adhere.
Eventually, the nozzle hole (also called the outflow hole) becomes blocked and casting becomes impossible.
このAl2O3析出を防止するためには以下列記す
る如き手段が採られている。 In order to prevent this Al 2 O 3 precipitation, the following measures are taken.
(a) 浸漬ノズル外周に保温付を巻きノズル内孔温
度の低下、ひいては溶鋼温度を低下させず
Al2O3析出を抑える方法があり、この方法はノ
ズルの割れ防止にもなるため一般に広く採用さ
れている。(a) Wrapping a heat insulator around the periphery of the immersion nozzle to prevent the nozzle inner hole temperature from decreasing and, by extension, the molten steel temperature.
There is a method to suppress Al 2 O 3 precipitation, and this method is widely adopted because it also prevents nozzle cracking.
(b) 浸漬ノズル又はその他の部分より不活性ガス
を吹込み浸漬ノズル内孔表面に泡を生じさせる
ことにより、れんが表面が溶鋼と接しないよう
にする。(b) Blow inert gas through the immersion nozzle or other parts to create bubbles on the surface of the inner hole of the immersion nozzle to prevent the brick surface from coming into contact with molten steel.
不活性ガスの吹込み場所としてはスライデイ
ングノズル上部ノズル、スライデイングノズル
プレート、スライデイングノズル下部ノズル、
浸漬ノズル、ロングノズルがある。 Inert gas injection locations include the upper nozzle of the sliding nozzle, the sliding nozzle plate, the lower nozzle of the sliding nozzle,
There are immersion nozzles and long nozzles.
浸漬ノズルからの吹込み方法としては外表面
より内孔にまで達する孔をあけ、ミクロポアれ
んがを埋め込み不活性ガスをミクロポアれんが
を介して吹込む方法、又は本本発明に係る内孔
寄りに一旦ガスを溜めるためのスリツトを設け
外表面からの導入孔を介して不活性ガスを吹込
む方法がある。 The method of blowing from an immersion nozzle is to make a hole that reaches the inner hole from the outer surface, bury a micropore brick, and blow inert gas through the micropore brick, or to blow the inert gas into the inner hole according to the present invention. There is a method of providing a slit for storage and blowing inert gas through an introduction hole from the outer surface.
前者は高圧で多量のガスを吹込むため溶鋼の
流れを乱し、又全開にガスがまわらないためそ
の部分よりAl2O3析出が始まる欠点があるが、
後者はスリツト部の内孔全周より不活性ガスが
吹出すためこのような欠点がない。 The former has the drawback that it disturbs the flow of molten steel because a large amount of gas is injected at high pressure, and that Al 2 O 3 begins to precipitate from that part because the gas does not circulate fully.
The latter does not have this drawback because the inert gas is blown out from the entire circumference of the inner hole of the slit portion.
(c) 浸漬ノズル内に発熱体を埋め込み浸漬ノズル
を加熱することにより、ノズル内孔温度の低下
ひいては溶鋼温度の低下を防ぎ、Al2O3析出、
溶鋼の凝固を防ぐことが考えられているが現在
の処、実用化されていない。(c) By embedding a heating element in the immersion nozzle and heating the immersion nozzle, a decrease in the nozzle inner hole temperature and, by extension, a decrease in the molten steel temperature is prevented, and Al 2 O 3 precipitation,
It has been considered to prevent molten steel from solidifying, but it has not been put to practical use at present.
しかして、本発明に施ける(b)のスリツトは、従
来法では同時成形であるため成形時の配合充填、
スリツトの芯出しが複雑であり、更には出来たス
リツトが凹凸になる欠点があると共にスリツトを
作る材料としてボール紙を使うと残留炭素がかな
り残り完全なスリツトとなり得ない。 However, since the slit (b) in the present invention is formed simultaneously in the conventional method, the mixing and filling at the time of forming,
The centering of the slit is complicated, and the resulting slit has the disadvantage that it becomes uneven, and if cardboard is used as the material for making the slit, a considerable amount of residual carbon remains, making it impossible to form a perfect slit.
また、ボール紙の代りにビニールシートを使う
とスリツトは出来るが、その弾力性のため成形後
戻り現象が起りヒビが入ることがある。 Also, if a vinyl sheet is used instead of cardboard, slits can be made, but due to its elasticity, molding may return and cracks may occur.
本発明は叙上の点に鑑みなされたもので、スリ
ツトからガスをノズル内孔内に通す部分のガス浸
透体をノズル本体と別構成とすると共に予備成形
するものとしてノズル本体との同時成形を避け、
又、スリツト形成材としては残留炭素が生じるこ
となく揮発又は焼失する材質を選択したことを特
徴とするものである。 The present invention has been made in view of the above points, and the gas permeable body of the part through which gas passes from the slit into the nozzle inner hole is constructed separately from the nozzle body, and is preformed simultaneously with the nozzle body. avoid,
Further, the slit forming material is characterized by selecting a material that volatilizes or burns out without producing residual carbon.
以下、これの詳細を図にもとづいて説明する。 Details of this will be explained below based on the drawings.
第１図は従来の方法を示し、ａ図は成形用ゴム
型１内に所定の高さまで耐火材２を充填してから
予め中央に立ててある芯棒３に、ガス浸透体形成
用の耐火材の配合４をボール紙５で囲繞した状態
で筒６内に収容して嵌着させた態様を示し、７は
その際に使用する芯出し器具である。 Fig. 1 shows a conventional method, and Fig. a shows a molding rubber mold 1 filled with refractory material 2 to a predetermined height, and then a core rod 3, which is erected in the center in advance, is filled with a refractory material 2 for forming a gas permeable body. A mode is shown in which a material composition 4 is surrounded by a cardboard 5 and accommodated in a tube 6 and fitted therein, and 7 is a centering tool used at that time.
次いで、筒６並びに芯出し器具７を引き抜き、
ｂ図に示す如く残りの耐火材を充填する。 Next, pull out the tube 6 and centering device 7,
Fill in the remaining refractory material as shown in Figure b.
以後、ゴム型１の密閉、加圧成形の工程を経
る。 Thereafter, the rubber mold 1 is sealed and pressure molded.
これを焼成するとボール紙５は焼失して、その
跡がスリツト８となる訳であるが、それはＣ図に
示す如く耐火材２と浸透体形成用の耐火材の配合
４とを同時成形するので、その際、変形を受け凹
凸になると共に残留炭素９の存在しているものと
なる。 When this is fired, the cardboard 5 is burnt out, leaving behind a slit 8. This is because the refractory material 2 and the refractory material composition 4 for forming the penetrant are simultaneously molded as shown in Figure C. At that time, it is deformed and becomes uneven, and residual carbon 9 is present.
これに対して本発明は第２図の如くであつて、
ａ図に示す如く成形用ゴム型１内に所定の高さま
で耐火材２を充填してから予め中央に立ててある
芯棒３にガス浸透体の予備成形品４′を、その外
表面に焼失の際、残留炭素の少ないスリツト形成
材５′を所定厚さに均一に塗布して嵌着させる。 In contrast, the present invention is as shown in FIG.
As shown in Fig. a, the rubber mold 1 for molding is filled with the refractory material 2 to a predetermined height, and then a preformed product 4' of gas permeable body is placed on the core rod 3 which has been set up in the center in advance, and the outer surface thereof is burned out. At this time, a slit forming material 5' with low residual carbon is uniformly applied to a predetermined thickness and fitted.
このスリツト成形材５′は加圧成形の際、塑性
変形することのない程度の硬度に調整されたもの
であり、又、予備成形品４′は長くなるものにあ
つては分割構成としてもよい。 This slit molded material 5' is adjusted to have a hardness that will not cause plastic deformation during pressure molding, and if the preformed product 4' is to be long, it may be divided into parts. .
次いで、ｂ図に示す如く残りの耐火材２を充填
する。 Next, the remaining refractory material 2 is filled as shown in Figure b.
以後、ゴム型１の密閉、加圧成形の工程を経て
焼成すると、該スリツト形成材５′は揮発焼失し
スリツト８′を形成する。 Thereafter, when the rubber mold 1 is sealed and pressure-molded and then fired, the slit forming material 5' is volatilized and burned away to form a slit 8'.
このスリツト８′はｃ図に示す如く加圧成形の
力に耐えて変形しないところの予備成形品４′の
外表面に同様の能力をもつて配されたスリツト形
成材５′の消失によるものであるから一切変形を
生じることなく、かつ、後記する如く残留炭素が
少ないので、完全な形状のスリツトが形成される
ものである。 This slit 8' is caused by the disappearance of the slit forming material 5', which has the same ability and is placed on the outer surface of the preform 4', which can withstand the force of pressure forming without deforming, as shown in Figure c. Since there is no deformation at all, and as will be described later, there is little residual carbon, so a perfectly shaped slit can be formed.
さらに、この焼成品の外周を所定形状に加工
し、外周よりスリツト８′までのガス導入孔を穿
設する。 Furthermore, the outer periphery of this fired product is processed into a predetermined shape, and gas introduction holes are bored from the outer periphery to the slit 8'.
ここに、本発明で使用されるスリツト形成材
５′は、常温において固体状態の皮膜を得ること
が可能であり、また非酸化性雰囲気下での加熱に
よりその大部分が分解消失する有機化合物であれ
ば如何なるものも用いることができ、例えば、パ
ラフインワツクス、油脂類ポリエチレン、ポリプ
ロピレン、ポリブテン、ポリスチレン、ポリエス
テル樹脂、ポリ酢酸ビニル、ポリビニルアルコー
ル、ポリビニルアセタノール、ポリアクリル酸ア
ミド、ポリカーボネート、メチルセルロース、酢
酸セルロースの如きセルロース誘導体、ポリアク
リロニトリル、ポリビニルピロリドン、ポリ塩化
ビニル、ポリ塩化ビニリデン、ポリエチレンオキ
サイド、合成ゴム類、石油樹脂、松脂等の熱可塑
性物質で常温固体のものは加熱溶融して被覆した
後、冷却することによるか、又は、水、アルコー
ル、ケトン、エーテル、エステル、芳香族系等か
ら選ばれた適当な溶剤に溶解せしめ、被覆後溶剤
を除去することによつて、本発明の意図する塗付
皮膜を得ることができる。 Here, the slit forming material 5' used in the present invention is an organic compound that can form a solid film at room temperature, and most of it decomposes and disappears when heated in a non-oxidizing atmosphere. Any material can be used, for example, paraffin wax, oil polyethylene, polypropylene, polybutene, polystyrene, polyester resin, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetanol, polyacrylic acid amide, polycarbonate, methylcellulose, acetic acid. Cellulose derivatives such as cellulose, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl chloride, polyvinylidene chloride, polyethylene oxide, synthetic rubbers, petroleum resins, pine resin, and other thermoplastic substances that are solid at room temperature are melted and coated by heating. The coating contemplated by the present invention can be applied by cooling or by dissolving in a suitable solvent selected from water, alcohols, ketones, ethers, esters, aromatics, etc. and removing the solvent after coating. An attached film can be obtained.
また、これらの内適当な乳化剤によつてエマル
ジヨン化することが可能なものは適度な濃度に調
整して使用することができる。 Among these, those that can be emulsified with a suitable emulsifier can be adjusted to an appropriate concentration before use.
一方、尿素樹脂、メラミン樹脂、アルキド樹
脂、キシレン樹脂、エポキシ樹脂、不飽和ポリエ
ステル樹脂等の熱硬化性樹脂に属するものも被覆
後熱処理を施すか又は酸、過酸化物等の適当な触
媒を使用することにより強固な皮膜を得ることが
可能であり、本発明による皮覆材として好適であ
る。 On the other hand, thermosetting resins such as urea resins, melamine resins, alkyd resins, xylene resins, epoxy resins, and unsaturated polyester resins are also heat-treated after coating, or a suitable catalyst such as acid or peroxide is used. By doing so, it is possible to obtain a strong film, which is suitable as the covering material according to the present invention.
あまり油、きり油等の乾性油も熱硬化性樹脂と
同様な硬化性を有するので、皮覆材として使用す
ることができる。 Drying oils such as soybean oil and tung oil can also be used as covering materials since they have the same curing properties as thermosetting resins.
しかしながら同じ熱硬化性樹脂においてもフエ
ノール樹脂、フラン樹脂、珪素樹脂は非酸化性雰
囲気下での加熱により多量の炭素或いは酸化珪素
を生成するので本発明の皮覆材としては不適であ
る。 However, among thermosetting resins, phenolic resin, furan resin, and silicone resin are unsuitable as the covering material of the present invention because they produce a large amount of carbon or silicon oxide when heated in a non-oxidizing atmosphere.
本発明による皮覆材は焼成過程において、その
大部分が消失することが前提であり、この基準は
JIS番号Ｋ−2425固定炭素分析において、その固
定炭素が20重量％以下が好ましい。 It is assumed that most of the covering material according to the present invention disappears during the firing process, and this standard is
In JIS No. K-2425 fixed carbon analysis, the fixed carbon content is preferably 20% by weight or less.
通常フエノール樹脂、フラン樹脂は該分析法に
おいて40重量％を越える値を示す為、強固な炭素
結合を生じ、本発明の意図する焼成時の空隙を生
じせしめることができない。 Normally, phenolic resins and furan resins show values exceeding 40% by weight in this analytical method, so they form strong carbon bonds and cannot form voids during firing as intended by the present invention.
しかしながら、ここで固定炭素量の極めて低い
尿素樹脂、ロジン等で変性した尿素変性フエノー
ル樹脂、ロジン変性フエノール樹脂等は該固定炭
素が20重量％以下であり、本発明の皮覆材として
使用することができる。 However, urea resins with extremely low amounts of fixed carbon, urea-modified phenolic resins modified with rosin, etc., rosin-modified phenolic resins, etc. have a fixed carbon content of 20% by weight or less, and cannot be used as the covering material of the present invention. Can be done.
叙上よりして、本発明にあつてはガス浸透体の
厚みが均一となり、スリツト８′が完全なものと
なり、不活性ガスの吐出が均一となるし、又、ガ
ス浸透体の予備成形体４′は継ぎ合せが可能なた
め充分長いスリツトでも造れる。 From the above, in the present invention, the thickness of the gas permeable body is uniform, the slit 8' is perfect, the inert gas is uniformly discharged, and the preformed body of the gas permeable body is Since 4' can be spliced, it can be made with a sufficiently long slit.
その他、ガス浸透体の材質選定が自由で、部分
的に材質を分け、ガスの吐出量をコントロールす
ることが可能である。 In addition, the material of the gas permeable body can be freely selected, and the material can be partially divided to control the amount of gas discharged.
第１図、第２図は従来法、本発明法の説明図で
ある。
４′……ガス浸透体の予備成形品、５′……スリ
ツト形成体、３……芯棒、１……成形用ゴム型、
２……不定形耐火物、８′……スリツト。
FIGS. 1 and 2 are explanatory diagrams of a conventional method and a method of the present invention. 4'... preformed gas permeable body, 5'... slit forming body, 3... core rod, 1... rubber mold for molding,
2... Monolithic refractory, 8'... slit.
Claims (1)
体内部に形成されたスリツト及びガス浸透体を介
して流出孔内面へガスを吹込む鋳造用ノズルの製
造法において、 予備成形したガス浸透体外周表面に、常温にお
いて固体状態の皮膜を得ること可能であり、加熱
によりその大部分が分解消失する有機化合物であ
つて、加圧成形の際、塑性変形することのない程
度の硬度に調整されたものよりなるスリツト形成
材の層を形成せしめ、該ガス浸透体を流出孔形成
用芯棒に装着した状態でノズル本体成形用ゴム型
内に設置し、芯棒とゴム型の間隙に該ガス浸透体
を埋設する態様で耐火材を充填して加圧成形した
後焼成することにより前記スリツト形成材を揮発
又は焼失せしめることを特徴とするスリツトを有
する鋳造用ノズルの製造法。[Claims] 1. A method for manufacturing a casting nozzle in which a molten metal outflow hole is concentrically surrounded and gas is blown into the inside of the outflow hole through a slit and a gas permeable body formed inside the nozzle body, comprising: It is possible to obtain a solid film on the outer peripheral surface of the gas permeable body at room temperature, and it is an organic compound that decomposes and disappears when heated, and is a film that does not undergo plastic deformation during pressure molding. A layer of slit forming material made of a material whose hardness has been adjusted is formed, and the gas permeable body is installed in a rubber mold for forming a nozzle body with the gas permeable body attached to a core rod for forming an outflow hole, and the core rod and rubber mold are A method for manufacturing a casting nozzle having a slit, characterized in that the slit-forming material is volatilized or burned out by filling a refractory material in such a manner that the gas permeable body is buried in the gap, press-forming the material, and then firing the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13565580A JPS5762857A (en) | 1980-09-29 | 1980-09-29 | Production of nozzle for casting having slit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13565580A JPS5762857A (en) | 1980-09-29 | 1980-09-29 | Production of nozzle for casting having slit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5762857A JPS5762857A (en) | 1982-04-16 |
| JPH0115342B2 true JPH0115342B2 (en) | 1989-03-16 |
Family
ID=15156854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13565580A Granted JPS5762857A (en) | 1980-09-29 | 1980-09-29 | Production of nozzle for casting having slit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5762857A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60239205A (en) * | 1984-05-11 | 1985-11-28 | 川崎炉材株式会社 | Manufacture of sliding nozzle |
| JPS60239206A (en) * | 1984-05-11 | 1985-11-28 | 川崎炉材株式会社 | Manufacture of sliding nozzle |
| JPS62130754A (en) * | 1985-12-02 | 1987-06-13 | Akechi Ceramics Kk | Gas blowing type immersion nozzle |
| JPS62279072A (en) * | 1986-05-24 | 1987-12-03 | Kurosaki Refract Co Ltd | Nozzle for pouring molten metal |
| JPS6313649A (en) * | 1986-07-03 | 1988-01-20 | Akechi Ceramics Kk | Production of nozzle for continuous casting |
| CA2064392A1 (en) * | 1991-04-12 | 1992-10-13 | James D. Engel | Gas permeable well nozzle |
| JP2511454Y2 (en) * | 1992-04-17 | 1996-09-25 | オーデリック株式会社 | Projection display device |
| CN102380591A (en) * | 2011-11-16 | 2012-03-21 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation process of diffusion slit breathable water supply opening |
| CN108311687B (en) * | 2018-02-13 | 2020-02-07 | 马鞍山市益江高温陶瓷制造有限公司 | Manufacturing method of long nozzle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505656A (en) * | 1973-05-25 | 1975-01-21 | ||
| JPS5023044A (en) * | 1973-07-06 | 1975-03-12 |
-
1980
- 1980-09-29 JP JP13565580A patent/JPS5762857A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5762857A (en) | 1982-04-16 |
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