JPH0790358B2 - Molding method for continuous casting nozzle - Google Patents
Molding method for continuous casting nozzleInfo
- Publication number
- JPH0790358B2 JPH0790358B2 JP2065569A JP6556990A JPH0790358B2 JP H0790358 B2 JPH0790358 B2 JP H0790358B2 JP 2065569 A JP2065569 A JP 2065569A JP 6556990 A JP6556990 A JP 6556990A JP H0790358 B2 JPH0790358 B2 JP H0790358B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- sheet
- continuous casting
- molding
- raw
- 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 - Fee Related
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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
- B28B1/40—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、連続鋳造用ノズルの成形方法に係わる。The present invention relates to a method for forming a continuous casting nozzle.
従来の連続鋳造用ノズルの成形方法は、各種原料を混合
→混練→乾燥→造粒工程により造粒化し、造粒体を調整
して成形坏土を作る。その後、成形坏土をプレス成形用
ゴム型内に充填し、このノズルプレス型を静水圧プレス
法等で加圧し、ノズル成形体を作っていた。In the conventional molding method of a nozzle for continuous casting, various raw materials are granulated by a process of mixing, kneading, drying, and granulating, and a granulated body is adjusted to form a molded kneaded material. Then, the kneaded clay was filled in a rubber mold for press molding, and this nozzle press mold was pressed by a hydrostatic pressing method or the like to form a nozzle molded body.
しかし、この成形体には組成の不均質部分、キレツなど
の不具合がしばしば見られたため、その原因を追求する
と、ゴム型内へ充填中の成形坏土の粒体は全て同じよう
に流動せず、いわゆる粒度偏析を起こし、組成の均質性
を損なうことが確認された。粒度偏析を無くす目的で、
造粒工程を改良し造粒体の質量、粒径について同一性を
高めたり、大小化の変更を試みたが、粒度偏析を排除す
ることが大変難しかった。However, since defects such as inhomogeneous parts of the composition and crevices were often found in this molded product, when pursuing the cause, all the granules of the molded kneaded material filling the rubber mold did not flow in the same way. It was confirmed that the so-called particle size segregation occurred and the homogeneity of the composition was impaired. For the purpose of eliminating particle size segregation,
Attempts were made to improve the granulation process to improve the identity of the mass and particle size of the granules and to change the size, but it was very difficult to eliminate the particle size segregation.
粉体ないし粉体の流動を利用する限り、粒子間の摩擦や
粒度偏析による成形体組成の不均質性が発生するから、
ノズル原料の充填ムラを排除するために、粉粒体による
型充填に代わる原料の充填方法を開発した。As long as the powder or the flow of the powder is used, inhomogeneity of the molding composition due to friction between particles and particle size segregation occurs,
In order to eliminate the uneven filling of the nozzle raw material, we have developed a raw material filling method that replaces the mold filling with powder particles.
本発明は、連続鋳造用ノズルの原料としての各種粉体素
原料を調合および湿式混合して泥漿化し、真空脱泡およ
び粘度調整を行った泥漿原料を生シート体に形成して粒
体の流動性を抑え、生シート状原料（１）をプレス成形
機のマンドレル（２）に巻きつけ、巻きつけた生シート
外表面にゴム型（３）をセットしてゴム型内に配置され
たノズル粗成形体を静水圧プレスで加圧する。The present invention mixes and wet mixes various raw powder materials as raw materials for a nozzle for continuous casting to form a sludge, which is vacuum degassed and viscosity-adjusted to form a raw sheet body to flow a granular material. The raw material sheet (1) is wound around the mandrel (2) of the press molding machine, and the rubber mold (3) is set on the outer surface of the rolled raw sheet to dispose the nozzle rough in the rubber mold. The molded body is pressed with a hydrostatic press.
生シートの形成には、ドクターブレード法、真空押し出
し法、射出成形法等が利用される。また、プレスには、
静水圧プレス法等が利用される。第１図（Ａ、Ｂ）に示
す成形手順図が、本発明の連続鋳造用ノズルの成形方法
である。A doctor blade method, a vacuum extrusion method, an injection molding method, or the like is used for forming the green sheet. Also, the press
The hydrostatic pressing method is used. The molding procedure diagram shown in FIG. 1 (A, B) is the molding method of the continuous casting nozzle of the present invention.
本方法によれば、シート状物を巻きつけたノズル粗成形
体をプレス用ゴム型（３）内に収納すれば良いので、従
来の粒体坏土をゴム型（３）内に均一に充填する煩雑な
工程より相当に全工程を簡略化できる。According to this method, since it is sufficient to store the nozzle rough formed body around which the sheet-like material is wound in the pressing rubber mold (3), the conventional granular kneaded clay is uniformly filled in the rubber mold (3). The whole process can be considerably simplified compared to the complicated process.
第１図は、本発明の連続鋳造用ノズルの成形方法におけ
る手順を示し、（Ａ）は生シート材（１）をマンドレル
（２）に巻きつける前の状態を示し、（Ｂ）は生シート
材（１）をマンドレル（２）に巻きつけてゴム型（３）
をセットするとともにシール用バンド（４）で固定した
状態を示す。生シート材の作成方法は、先ず、素原料に
バインダーを加えつつ調合、湿式混練を行い泥漿化し、
当該泥漿を真空脱泡した後、粘度調整をしてシート状に
形成する。FIG. 1 shows a procedure in a method for forming a nozzle for continuous casting according to the present invention, (A) shows a state before winding a green sheet material (1) around a mandrel (2), and (B) shows a green sheet. The material (1) is wrapped around the mandrel (2) and the rubber mold (3)
Is set and fixed with the sealing band (4). The raw sheet material is first prepared by adding a binder to the raw material, mixing and wet-kneading it into a sludge,
After vacuum degassing the slurry, the viscosity is adjusted to form a sheet.
シート（１）の製造方法は、通常の押出成形法、ドクタ
ーブレード法および射出成形法のいずれを用いても良
い。押出成形法は、スクリューまたはラムにより、ホッ
パーから投入した泥漿原料を所定形状の口金から押し出
して生シート状に成形する。ドクターブレード法は、脱
泡、粘度調整した泥漿を鋭い刃に当てて所定厚さの生シ
ートに成形する。また、射出成形法は泥漿原料を高圧で
射出して生シートを作る。The sheet (1) may be produced by any of the usual extrusion molding method, doctor blade method and injection molding method. In the extrusion molding method, a slurry or ram is used to extrude the slurry raw material introduced from the hopper from a die having a predetermined shape to form a raw sheet. In the doctor blade method, sludge defoamed and adjusted in viscosity is applied to a sharp blade to form a raw sheet having a predetermined thickness. In addition, in the injection molding method, raw materials are made by injecting sludge raw material at high pressure.
本実施例では、上記ドクターブレード法により生シート
の成形を行い、0.05〜5.0mmの厚さに仕上げた。In this example, a green sheet was formed by the doctor blade method and finished to a thickness of 0.05 to 5.0 mm.
尚、素原料としては、アルミナ、シリカ、ジルコニア、
ジルコニアムライト、アルミナムライト、金属シリコ
ン、粘土、黒鉛、ピッチ粉、レジン粉、レジン液、分散
剤、有機溶剤等を使用することができる。As the raw material, alumina, silica, zirconia,
Zirconium mullite, alumina mullite, metallic silicon, clay, graphite, pitch powder, resin powder, resin liquid, dispersant, organic solvent and the like can be used.
上記方法により得た生シート（１）は、プレス成形機の
マンドレル（２）に巻きつけられ、所定寸法に仕上げた
後に、その表面にゴム型（３）をセットし、静水圧プレ
ス法により0.5〜2.0Ton/cm2で加圧し、ゴム型（３）と
シート（１）接合面の圧着を図り、生シート化原料の密
度を高めた後、脱型工程を経てノズル成形体を得る。The green sheet (1) obtained by the above method is wound around the mandrel (2) of a press molding machine, and after finishing to a predetermined size, a rubber mold (3) is set on the surface of the raw sheet (1), and the sheet is pressed by isostatic pressing to 0.5. After pressurizing at ~ 2.0 Ton / cm 2 , the bonding surface of the rubber mold (3) and the sheet (1) is pressure-bonded to increase the density of the raw material for raw sheet, and then a nozzle molded body is obtained through a demolding step.
第１、２表（Ａ）に示す素原料の配合割合（重量部）の
アルミナ−炭素質ノズルとジルコニア−炭素質ノズルに
より、本発明法と従来法を比較し、その結果を第１、２
表（Ｂ）に示す。The method of the present invention was compared with the conventional method by using the alumina-carbonaceous nozzle and the zirconia-carbonaceous nozzle having the blending ratio (parts by weight) of the raw materials shown in Tables 1 and 2 (A), and the results were compared with those of the first and second embodiments.
It shows in Table (B).
表中、＊：測定温度1000℃、 ＊＊：×106kgf/cm2である。In the table, *: measurement temperature is 1000 ° C, **: × 10 6 kgf / cm 2 .
耐熱衝撃抵抗係数、曲げ強さ、動弾性率、熱膨張率の間
には、 Ｒ′＝耐熱衝撃抵抗係数 Ｓ＝曲げ強さ Ｅ＝動弾性率 α＝熱膨張率 とすると、 なる関係式が成り立つ。Between the thermal shock resistance coefficient, bending strength, kinematic elastic modulus, and thermal expansion coefficient, R '= thermal shock resistance coefficient S = bending strength E = dynamic elastic coefficient α = thermal expansion coefficient, The following relational expression holds.
〔発明の効果〕 本発明の連続鋳造用ノズルの成形方法により、従来方法
において不可避だった粒度偏析に伴うノズル組織のムラ
の発生が抑制され、またシートを用いたことにより形成
されるラミネート組織が、ノズルに賦与される熱衝撃に
起因する応力を分散するので、ノズル使用時の高温溶鋼
流（1650℃程度にも達する）に対する耐スポーリング抵
抗性が大幅に改善される。 [Effects of the Invention] By the method for forming a continuous casting nozzle of the present invention, the occurrence of unevenness in the nozzle structure due to particle size segregation, which was unavoidable in the conventional method, is suppressed, and the laminated structure formed by using a sheet is Since the stress caused by the thermal shock applied to the nozzle is dispersed, the spalling resistance to the high temperature molten steel flow (up to about 1650 ° C) when using the nozzle is greatly improved.
また、素原料をシート化する本発明方法は，従来の充填
法では不可能だった種々の配合剤の添加が可能となり、
添加した異材質による多層組織の構造体の形成により，
溶鋼介在物の付着、ノズル内孔の閉塞防止、高耐蝕性、
高耐酸化性の賦与等の著しい製品特性の向上を図り得
る。Further, the method of the present invention for forming a raw material into a sheet makes it possible to add various compounding agents, which were impossible by the conventional filling method,
Due to the formation of multi-layered structure by the added different materials,
Adhesion of molten steel inclusions, prevention of nozzle inner hole blockage, high corrosion resistance,
It is possible to significantly improve product characteristics such as imparting high oxidation resistance.
本発明方法によれば、プレス用ゴム型内に収納するノズ
ル原料を粒粉体状物をゴム型内に均一に充填する煩雑な
工程が簡略化されるとともに、調合、混練、成形工程で
従来不可避であった発塵現象が抑えられ、全工程の自動
化が容易となり、また加工工程のコストを低減し得るの
で歩留まりが向上する等の著しい改善効果を実現し得
る。According to the method of the present invention, the complicated process of uniformly filling the rubber mold with the granular powder material of the nozzle raw material to be housed in the rubber mold for pressing is simplified, and the conventional method is used in the mixing, kneading and molding processes. The inevitable dusting phenomenon is suppressed, the automation of the whole process is facilitated, and the cost of the processing process can be reduced, so that a remarkable improvement effect such as an improvement in yield can be realized.
第１図は本発明の連続鋳造用ノズルの成形方法手順を示
したものであり、（Ａ）はシート材をマンドレルに巻き
つける前の状態を示し、（Ｂ）はシート材をマンドレル
に巻きつけてゴム型をセットし、シール用バンドで固定
した状態を示す。 （１）シート材 （２）マンドレル （３）ゴム型 （４）シール用バンドFIG. 1 shows a procedure of a method for forming a nozzle for continuous casting according to the present invention. (A) shows a state before winding a sheet material around a mandrel, (B) shows a sheet material around a mandrel. Shows the state where the rubber mold is set and fixed with the sealing band. (1) Sheet material (2) Mandrel (3) Rubber type (4) Seal band
Claims (1)
シート状に成形し、誕生シートを成形機マンドレルに巻
き付けるとともに、ゴム型を生シート外表面にセットし
て加圧成形し、成形体を得ることを特徴とする連続鋳造
用ノズルの成形方法。Claims: 1. Molding slurry prepared by wet-mixing the prepared powder raw material into a raw sheet, winding the birth sheet around the mandrel of the molding machine, setting a rubber mold on the outer surface of the raw sheet, and press-molding. A method for molding a nozzle for continuous casting, which comprises obtaining a body.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2065569A JPH0790358B2 (en) | 1990-03-17 | 1990-03-17 | Molding method for continuous casting nozzle |
| KR1019910004188A KR970000377B1 (en) | 1990-03-17 | 1991-03-16 | Method of manufacturing a nozzle for metal casting process and the articles produced thereby |
| GB9105708A GB2241921B (en) | 1990-03-17 | 1991-03-18 | Method of manufacturing a nozzle for metal casting processes and the articles produced thereby |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2065569A JPH0790358B2 (en) | 1990-03-17 | 1990-03-17 | Molding method for continuous casting nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03268862A JPH03268862A (en) | 1991-11-29 |
| JPH0790358B2 true JPH0790358B2 (en) | 1995-10-04 |
Family
ID=13290775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2065569A Expired - Fee Related JPH0790358B2 (en) | 1990-03-17 | 1990-03-17 | Molding method for continuous casting nozzle |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0790358B2 (en) |
| KR (1) | KR970000377B1 (en) |
| GB (1) | GB2241921B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5711833A (en) * | 1995-07-25 | 1998-01-27 | Thermicedge Corporation | Process for the production of thin walled ceramic structures |
| FR2785836B1 (en) * | 1998-11-12 | 2000-12-15 | Snecma | PROCESS FOR PRODUCING THIN CERAMIC CORES FOR FOUNDRY |
| GB2384774A (en) * | 2002-02-01 | 2003-08-06 | Carbon Applic Technology Ltd | Refractory article comprising particulate pitch |
| DE102011087110A1 (en) * | 2011-11-25 | 2013-05-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ceramic and / or powder metallurgical molded parts and process for their preparation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365912A (en) * | 1971-05-01 | 1974-09-04 | Dunlop Ltd | Method of moulding rubber bands |
| AR206951A1 (en) * | 1974-11-25 | 1976-08-31 | Uniroyal Inc | METHOD OF PRODUCING A TOOTHED DRIVE BELT |
| GB2011798B (en) * | 1977-10-21 | 1982-03-24 | Allied Insulators Ltd | Processing moist plastic clay |
| EP0265777B1 (en) * | 1986-10-31 | 1993-02-10 | Gte Products Corporation | Method of preparing a ceramic monolithic structure having an internal cavity contained therein |
-
1990
- 1990-03-17 JP JP2065569A patent/JPH0790358B2/en not_active Expired - Fee Related
-
1991
- 1991-03-16 KR KR1019910004188A patent/KR970000377B1/en not_active IP Right Cessation
- 1991-03-18 GB GB9105708A patent/GB2241921B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR970000377B1 (en) | 1997-01-09 |
| JPH03268862A (en) | 1991-11-29 |
| GB9105708D0 (en) | 1991-05-01 |
| GB2241921A (en) | 1991-09-18 |
| GB2241921B (en) | 1993-09-22 |
| KR910016415A (en) | 1991-11-05 |
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