JPS62134157A - Method for preventing splashing of ingot bottom - Google Patents
Method for preventing splashing of ingot bottomInfo
- Publication number
- JPS62134157A JPS62134157A JP27549585A JP27549585A JPS62134157A JP S62134157 A JPS62134157 A JP S62134157A JP 27549585 A JP27549585 A JP 27549585A JP 27549585 A JP27549585 A JP 27549585A JP S62134157 A JPS62134157 A JP S62134157A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- plate
- ingot
- inlet
- splash prevention
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明はインゴット(m塊)の製造に係り、特にインゴ
ット造塊時に発生するスプラッシュを防止する方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the production of ingots (m blocks), and particularly to a method for preventing splash that occurs during ingot ingot formation.
(従来の技術及び問題点)
鰭型に溶鋼を注入してインゴットを製造する方法には上
注法と下注法とがあり、特に下注法は鋳型の底部から溶
鋼を注入するが、注入速度が遅くなり、溶鋼の鋳型内で
の上昇がゆるやかであるので、上注法に比べて鋳肌が美
麗となる利点がある。(Prior art and problems) There are two methods for producing ingots by injecting molten steel into a fin mold: the top pouring method and the bottom pouring method.In particular, the bottom pouring method injects molten steel from the bottom of the mold; Since the speed is slower and the molten steel rises more slowly in the mold, it has the advantage of producing a more beautiful casting surface than the top pouring method.
しかし、か\る下注法においても、第4図に示すように
、定盤1上に載置した鋳型2内に、注入管3に注入した
溶鋼を湯道4を介して定盤上の流入口5から注入させる
鋳込み開始時には、流入口5から流入した溶鋼が鋳型内
に噴出し、鋳型底部の側壁面に飛散付着するため、イン
ボッ1〜底部にスプラッシュとして残存するという問題
が′ある。However, even in such a bottom pouring method, as shown in Fig. 4, molten steel is poured into a mold 2 placed on a surface plate 1 through a runner 4 and placed on the surface plate. At the start of pouring from the inlet 5, the molten steel that has flowed in from the inlet 5 squirts into the mold and scatters and adheres to the side wall surface of the bottom of the mold, so there is a problem that it remains as a splash on the bottom of the inlet 1.
このスプラッシュの発生を防止する対策としては、注入
管3に溶鋼を注入する速度を小さくして静水圧を低下さ
せ、流入口5からの溶鋼噴出速度を小さくしてやる方法
が試みられているが、鋳込み時間を延長化する欠点が生
ずると共にスプラッシュの発生を完全に防止することは
できない。また、鋳型底部、すなわち、流入口5の上に
四角板を載置して溶鋼の側方への噴出を抑制する方法も
考えられるが、溶鋼の流入につれて四角板が側方に逃げ
てしまい、スプラッシュ防止の効果は得られない。As a measure to prevent the occurrence of this splash, attempts have been made to reduce the speed at which molten steel is injected into the injection pipe 3 to lower the hydrostatic pressure, and to reduce the speed at which molten steel is spouted from the inlet 5. This has the drawback of prolonging the time, and it is not possible to completely prevent the occurrence of splashes. Another possible method is to place a square plate on the bottom of the mold, that is, on top of the inlet 5, to prevent the molten steel from spewing out to the sides, but as the molten steel flows in, the square plate escapes to the sides. No splash prevention effect can be obtained.
(発明の目的)
本発明は、上記下注造塊に関する従来技術の欠点を解消
し、インゴット・ボトムにスプラッシュ付着がない美麗
な鋳肌のインゴットを製造し得る簡易なスプラッシュ防
止方法を提供することを目的とするものである。(Objective of the Invention) The present invention provides a simple splash prevention method that eliminates the drawbacks of the prior art related to the above-mentioned bottom pouring ingots and can produce an ingot with a beautiful casting surface without splash adhesion on the ingot bottom. The purpose is to
(発明の構成)
上記目的を達成するため、本発明者等は、下注造塊の鋳
込み開始時における定盤の流入口からの溶鋼噴出流をス
プラッシュ防止上有効にコントロールできる方策につい
て研究を重ねた結果、定盤の流入口にドーム型のスプラ
ッシュ防止板を鋳込み開始に先立って載置することによ
り、流入口からの溶鋼噴出流をドーム内面で常に受けつ
つスプラッシュ防止板が自己姿勢保持機能を発揮し、鋳
込み開始時から持続してその効果を奏することが判明し
、本発明をなしたものである。(Structure of the Invention) In order to achieve the above object, the present inventors have repeatedly conducted research on measures to effectively control the flow of molten steel from the inflow port of the surface plate at the start of pouring of the bottom pouring ingot to prevent splashing. As a result, by placing a dome-shaped splash prevention plate at the inlet of the surface plate before starting casting, the splash prevention plate can maintain its self-position while constantly receiving the molten steel jet from the inlet on the inside of the dome. It has been found that this effect continues from the start of casting, and the present invention has been made based on this finding.
すなわち、本発明に係るインゴット・ボトムのスプラッ
シュ防止方法の要旨とするところは、溶湯流入口を有す
る定盤上に鋳型を載置し、溶湯を湯道を介して該流入口
より鋳型内に注入する下注造塊法において、前記鋳型の
底部の該流入口上に、該流入口からの溶湯流れが衝突す
る面をR面としたドーム型スプラッシュ防止板をおき、
しかる後に鋳込みを開始することを特徴とするものであ
る。That is, the gist of the ingot bottom splash prevention method according to the present invention is that a mold is placed on a surface plate having a molten metal inlet, and molten metal is injected into the mold from the inlet through a runner. In the bottom pouring ingot method, a dome-shaped splash prevention plate is placed above the inlet at the bottom of the mold, the surface with which the molten metal flow from the inlet collides is a rounded surface,
It is characterized in that casting is started after a certain time.
以下に本発明を実施例に基づいて詳細に説明する。The present invention will be explained in detail below based on examples.
本発明法では、第1図に示すように、下注造塊の鋳込み
開始に先立って、定盤1の流入口5にスプラッシュ防止
板6を予め載置しておくものであ机
このスプラッシュ防止板6は、第2図に示す如く、断面
が円形状、円弧状、放物線状等のように種々の形状をと
り得るが、少なくも溶湯の噴出流が当る面が適宜曲率の
R面を有するドーム型である必要がある。そのようなR
面を有するならば、第2図(a)に示す如く同一肉厚の
ドーム壁を有していても、また同図(d)に示す如く異
なる肉厚のドーム壁を有していてもよく、但し、左右対
称であるのが好ましい。In the method of the present invention, as shown in FIG. 1, a splash prevention plate 6 is placed in advance at the inlet 5 of the surface plate 1 before starting the casting of the pre-cast ingot. As shown in FIG. 2, the plate 6 can have various shapes such as circular, arcuate, parabolic, etc. in cross section, but at least the surface on which the jet of molten metal hits has an R surface with an appropriate curvature. Must be dome-shaped. Such R
If it has a surface, it may have a dome wall of the same thickness as shown in FIG. 2(a), or may have a dome wall of different thickness as shown in FIG. 2(d). , However, it is preferable that it be symmetrical.
上記形状のスプラッシュ防止板を使用すると、鋳込み開
始直後は、第3図(a)に示すように、定盤の流入口5
から噴出した溶湯流は、まずスプラッシュ防止板6のR
面に衝突してR面に沿って側方に流れるが、R面に及ぼ
す力は求心的であるので、上方に押し上げられはするも
のの(図中、白矢印)、スプラッシュ防止板6が側方に
シフトして流入口5から外れることはなく、継続して溶
湯流をR面で受けることができる。その後、溶湯は流入
口5より噴出し続けても、スプラッシュ防止板6は溶湯
の噴出流の頂点に乗ったまま湯面上昇と共に上昇し、噴
出流を常にR面にて受は続けることができる。また、R
面で受けた溶湯流は、スプラシュ防止板6の求心作用に
より、常に下方乃至略下方に流れ、側方に偏倚しないの
で、上昇湯面が揺動することがなく、鋳型内面で波打ち
現象(湯面の上下移動)が発生するようなこともない。When using the splash prevention plate of the above shape, immediately after the start of casting, as shown in Fig. 3(a), the inlet 5 of the surface plate
The molten metal flow spouted from the R of the splash prevention plate 6 first
The splash prevention plate 6 collides with the surface and flows laterally along the R surface, but since the force exerted on the R surface is centripetal, although it is pushed upward (white arrow in the figure), the splash prevention plate 6 flows laterally. The R surface can continue to receive the molten metal flow without shifting to the inlet 5 and coming off the inlet 5. After that, even if the molten metal continues to spout from the inlet 5, the splash prevention plate 6 remains on top of the molten metal jet flow and rises as the molten metal level rises, allowing the splash prevention plate 6 to continue to receive the jet flow at all times on the R surface. . Also, R
The molten metal flow received by the surface always flows downward or substantially downward due to the centripetal action of the splash prevention plate 6, and is not deflected to the side. Therefore, the rising molten metal level does not fluctuate, and a waving phenomenon (molten metal) occurs on the inner surface of the mold. vertical movement of the surface) does not occur.
つまり、流入口5からの溶湯の流れを安定させることが
可能である。In other words, it is possible to stabilize the flow of molten metal from the inlet 5.
また、スプラッシュ防止板6は、鋳込み開始直後から上
昇湯面上に溶湯噴出流が消失する時点程度まで形状を維
持できれば充分であるので、自溶性の材料で製作するの
が好ましい。しかし、鋳造終了後鋳型上部より回収可能
であればレンガ等自溶性でないものでもよい。例えば、
鋳込むべき溶湯が?8鋼である場合には、通常、300
〜600°Cの形状消失温度で、かつ800〜12oO
℃前後の融点を有するように配合したフラックス、好ま
しくは低融点フラックス(例、CaO−Na2O−5i
o2系、CaO−An 20 :l S IO2系)
を使用し、バインダーとして例えばポリビニルアルコー
ルを用いて成形したものとすることができる。なお、ポ
リビニルアルコールに代えて無機質バインダを用いるこ
ともできる。Further, the splash prevention plate 6 is preferably made of a self-fusing material since it is sufficient that the shape can be maintained from immediately after the start of casting until the time when the molten metal jet disappears on the rising surface of the molten metal. However, non-self-fusing materials such as bricks may be used as long as they can be recovered from the upper part of the mold after casting. for example,
What molten metal should be poured? 8 steel, usually 300
With a shape loss temperature of ~600°C and 800~12oO
A flux blended to have a melting point around ℃, preferably a low melting point flux (e.g., CaO-Na2O-5i
o2 system, CaO-An 20 :l S IO2 system)
It can be molded using, for example, polyvinyl alcohol as a binder. Note that an inorganic binder can also be used instead of polyvinyl alcohol.
なお、スプラッシュ防止板6には、第2図(e)に示す
ように、ドームに1個又はmht個の貫通孔7を設ける
のが好ましい。貫通ロアを設けることにより、ドームの
内面に存在するガス乃至空気がこの貫通孔7を通って外
に流れ出るので、ドームのR面内に滞留することを防止
でき、したがって、スプラッシュ防止板6の求心作用を
一層効果的に発揮させることができる。It is preferable that the splash prevention plate 6 is provided with one or mht through holes 7 in the dome, as shown in FIG. 2(e). By providing the through-lower, gas or air existing on the inner surface of the dome flows out through the through-hole 7, so it can be prevented from staying in the rounded surface of the dome, and the centripetal movement of the splash prevention plate 6 can be prevented. The action can be exerted even more effectively.
(実施例)
第2図(a)に示す形状のスプラッシュ防止板を第1図
に示すように鋳型の底面におき、溶!II!(普通鋼)
を注入管に注入する下注造塊法によってインゴットを製
造した。(Example) A splash prevention plate having the shape shown in FIG. 2(a) was placed on the bottom of the mold as shown in FIG. II! (common steel)
An ingot was manufactured by a bottom pouring ingot method in which the ingot was injected into an injection tube.
なお、スプラッシュ防止板は、Si0.38.0%、A
Q、031.5%、Ca○34.0%、Na2012.
0%、フッ素6%、残部がその他の成分からなる組成(
wt%)でバインダーとしてポリビニルアルコールを用
いたフラックスにて製作した。In addition, the splash prevention plate is made of Si0.38.0%, A
Q, 031.5%, Ca○34.0%, Na2012.
Composition consisting of 0%, 6% fluorine, and the balance other components (
wt%) and a flux using polyvinyl alcohol as a binder.
造塊後、インゴット・ボトムの表面を調べたところ、ス
プラッシュ発生は全く認められず、また波打ちもない美
麗な鋳肌のインボッ!へであった。After ingot formation, we examined the surface of the ingot bottom and found that no splash was observed, and the ingot bottom had a beautiful cast surface with no waves! It was to.
(発明の効果)
以上詳述したように1本発明によれば、下注造塊の鋳込
みに際してR面を有するドーム型のスプラッシュ防止板
を使用するので、インゴット・ボトムに発生するスプラ
ッシュを完全に防止することができ、また波打ちも防止
でき、美麗な鋳肌のインゴットを簡易に製造できる。ま
た、造塊後の紡肌手入れ作業を省略することができ、更
には鋳込み速度を低下する必要もないので、経済的であ
る。(Effects of the Invention) As detailed above, according to the present invention, since a dome-shaped splash prevention plate with a rounded surface is used when pouring an ingot, the splash generated on the ingot bottom can be completely prevented. It is also possible to prevent waving, and it is possible to easily produce ingots with beautiful cast surfaces. Further, it is possible to omit the skin care work after forming the ingot, and there is no need to reduce the casting speed, which is economical.
第1図は本発明による造塊前の鋳型準位状況を示す概略
断面図、
第2図(a)〜(s)は本発明の実施に用いるスプラッ
シュ防止板の形状例を示す断面図、
第3図(a)、(b)は溶湯の噴出流とスプラッシュ防
止板の求心作用を説明する図、
第4図は従来法でスプラッシュが発生する状況を説明す
る図である。
1・・定盤、 2・・・鋳型、
3・・・注入管、 4・・・湯道、
5・・・流入口、 6・・・スプラッシュ防止板、7
・・貫通孔。
特許出願人 大同特殊鋼株式会社
代理人弁理士 中 村 尚
第1図
第2図
(cl)(b)
(C) (d)(e)FIG. 1 is a schematic sectional view showing the mold level state before ingot formation according to the present invention; FIGS. Figures 3(a) and 3(b) are diagrams for explaining the jet flow of molten metal and the centripetal action of the splash prevention plate, and Figure 4 is a diagram for explaining the situation in which splash occurs in the conventional method. 1... Surface plate, 2... Mold, 3... Injection pipe, 4... Runway, 5... Inlet, 6... Splash prevention plate, 7
...Through hole. Patent Applicant Daido Steel Co., Ltd. Representative Patent Attorney Takashi Nakamura Figure 1 Figure 2 (cl) (b) (C) (d) (e)
Claims (3)
を湯道を介して該流入口より鋳型内に注入する下注造塊
法において、前記鋳型の底部の該流入口上に、該流入口
からの溶湯流れが衝突する面をR面としたドーム型スプ
ラッシュ防止板をおき、しかる後に鋳込みを開始するこ
とを特徴とするインゴット・ボトムのスプラッシュ防止
方法。(1) In the bottom pouring ingot method, in which a mold is placed on a surface plate having a molten metal inlet, and the molten metal is poured into the mold from the inlet through a runner, the upper part of the inlet at the bottom of the mold is A method for preventing splash on an ingot bottom, which comprises: placing a dome-shaped splash prevention plate with a rounded surface on which the molten metal flow from the inlet collides, and then starting casting.
求の範囲第(1)項記載のインゴット・ボトムのスプラ
ッシュ防止方法。(2) The ingot bottom splash prevention method according to claim (1), wherein the splash prevention plate is self-fusing.
通孔を設けたものである特許請求の範囲第(1)項又は
第(2)項記載のインゴット・ボトムのスプラッシュ防
止方法。(3) The ingot bottom splash prevention method according to claim 1 or 2, wherein the dome-shaped splash prevention plate has a through hole provided in the rounded surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27549585A JPS62134157A (en) | 1985-12-07 | 1985-12-07 | Method for preventing splashing of ingot bottom |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27549585A JPS62134157A (en) | 1985-12-07 | 1985-12-07 | Method for preventing splashing of ingot bottom |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62134157A true JPS62134157A (en) | 1987-06-17 |
Family
ID=17556295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27549585A Pending JPS62134157A (en) | 1985-12-07 | 1985-12-07 | Method for preventing splashing of ingot bottom |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62134157A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104275450A (en) * | 2014-10-11 | 2015-01-14 | 清华大学 | Method and special device of bottom gating type ingot casting |
-
1985
- 1985-12-07 JP JP27549585A patent/JPS62134157A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104275450A (en) * | 2014-10-11 | 2015-01-14 | 清华大学 | Method and special device of bottom gating type ingot casting |
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