JPS6024246A - Continuous casting method of metal - Google Patents

Abstract

PURPOSE:To cast continuously a metal without solidifying the molten metal between a header and a casting mold by introducing a gas between the vertical casting mold and a nozzle which supplies the molten metal thereto and depressing the molten metal on the outside circumference of the nozzle down to the tip of the nozzle. CONSTITUTION:A nozzle part 9 of a height H is formed under a vessel (header) 2 formed of heat insulating refractories for receiving a molten metal and a space D is provided between the same and the inside surface of a casting mold 5 to make H>D. A gas is introduced between the mold 5 and the nozzle 9 to depress the molten metal 1 on the outside circumference of the nozzle 9 down to the tip of the nozzle 9. The metal 1 is continuously cast without solidifying the metal 1 between the header 2 and the mold 5 by the above-mentioned method.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は金属の連続鋳造法に関するものであり、特に小
径の丸棒や角棒の鋳造に好適な連続鋳造法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a continuous casting method for metals, and particularly to a continuous casting method suitable for casting small diameter round bars and square bars.

〔発明の背景〕[Background of the invention]

金属の連続鋳造法には多数の方法があるが・その中に第
１図に示す構造のものがある。−名。There are many methods for continuous metal casting, and one of them has the structure shown in Figure 1. -First name.

「気体加圧ホラ））ツブ鋳造法」と呼げれているのがこ
れである。この鋳造法では垂直鋳型５の上にヘッダ２（
断熱耐火物の溶湯受容器）があり。This is called the ``gas pressurized hollow casting method''. In this casting method, a header 2 (
There is an insulated refractory molten metal receiver).

両者の間に０．３〜１Ｍの微小隙間３を設け、ここから
空気、金素、アルゴンなどの気体を供給し。A minute gap 3 of 0.3 to 1M is provided between the two, and a gas such as air, gold, or argon is supplied from there.

その位置における溶融金属の静水圧に等しい圧力を加え
ることが特徴となっている。このようにすると溶融金属
１はヘッダから鋳型に導かれ凝固し。It is characterized by applying a pressure equal to the hydrostatic pressure of the molten metal at that location. In this way, the molten metal 1 is guided from the header to the mold and solidified.

図中のような凝固殻が生成する。ところが鋳型とヘッダ
との間は気体相が存在する九め、鋳型の最上部は溶融金
属に接触することがない。したがってヘッダと鋳型との
間に溶融金属が浸入して凝固し、鋳塊の下方への引抜き
が不可能になるような現象が起らない。換言すれば凝固
殻は常に鋳型の最上部より少し下方の位置から生成し・
連続鋳造に好適な状態が得られる。A solidified shell as shown in the figure is formed. However, since a gas phase exists between the mold and the header, the top of the mold does not come into contact with the molten metal. Therefore, a phenomenon in which molten metal enters between the header and the mold and solidifies, making it impossible to pull out the ingot downward, does not occur. In other words, the solidified shell is always generated from a position slightly below the top of the mold.
Conditions suitable for continuous casting are obtained.

以上は本鋳造法の定常状態における現象であるが鋳造開
始時には次のような現象が起き１本鋳造法の大きな欠点
となっている。つまり鋳造開始時には第２図のようにダ
ミーバフ上へ溶融金属が注かれる。そうすると溶融金属
の上表面は徐々に上昇し、やがて鋳型の最上部に到達す
るが、その瞬間に上記の鋳型とヘッダとの隙間に溶融金
属が流れ込み、多くの場合、この隙間内で溶融金属が凝
固し、その後の鋳塊の引抜きが不可能になることがある
。The above-mentioned phenomena occur in the steady state of this casting method, but the following phenomenon occurs at the start of casting, which is a major drawback of the one-piece casting method. That is, at the start of casting, molten metal is poured onto the dummy buff as shown in FIG. As a result, the upper surface of the molten metal gradually rises and eventually reaches the top of the mold, but at that moment the molten metal flows into the gap between the mold and the header, and in many cases, the molten metal flows into the gap between the mold and the header. Solidification may occur and subsequent drawing of the ingot may become impossible.

この対策として、この隙間の入口を紙、セロ・・ンテー
ブ・耐火性繊維で塞ぐことがなされている。As a countermeasure to this problem, the entrance of this gap is sealed with paper, cello-antave, or fire-resistant fiber.

しかし、この対策法は大径の丸棒や角棒の連続鋳造の場
合には適するが、例えば５０閣以下といった小径の丸棒
や角棒の連続鋳造の場合には不適当である。その理由は
２つある。その１つは上記の紙などで隙間の入口を塞ぐ
作業が困難なことである。もう１つは鋳造開始時に溶融
金属の上表面の上昇速度が大きく、上記紙などのふたを
押し抜けて溶融金属が隙間に流れ込むことがあることで
ある。However, although this countermeasure is suitable for continuous casting of large-diameter round bars and square bars, it is inappropriate for continuous casting of small-diameter round bars and square bars, such as those of 50 or less diameters. There are two reasons for this. One of the problems is that it is difficult to close the entrance of the gap with the above-mentioned paper or the like. Another problem is that the rising speed of the upper surface of the molten metal is high at the start of casting, and the molten metal may push through the paper or other lid and flow into the gap.

〔発明の目的〕[Purpose of the invention]

本発明の目的は小径の丸棒あるいは角棒を連続鋳造する
にあたり、上記紙などのふたを必要とせず、容易に鋳造
開始が可能な連続鋳造法を提供することにある。An object of the present invention is to provide a continuous casting method for continuous casting of small diameter round bars or square bars, which does not require a lid such as the above-mentioned paper and which allows casting to be started easily.

〔発明の概要〕[Summary of the invention]

第３図は本発明の装置を示す。第１図の従来の装置と異
なるところはヘッダ２の下に高さがＨで。FIG. 3 shows the apparatus of the invention. The difference from the conventional device shown in Fig. 1 is that there is a height H below the header 2.

鋳型５の内面との間に隙間りをもつノズル部９を形成さ
せた点にある。そうすると定常の鋳造状態では隙間３か
ら吹込まれた気体により加圧され。The point is that a nozzle part 9 is formed with a gap between it and the inner surface of the mold 5. Then, in a steady casting state, the gas blown from the gap 3 pressurizes.

溶融金属１の鋳型内面における上表面は、第３図のよう
にノズルの下に押し込まれ、凝固殻が確実に鋳型内で生
成し良好な状態で鋳塊を下方に引抜くことができる。The upper surface of the inner surface of the mold of the molten metal 1 is pushed under the nozzle as shown in FIG. 3, and a solidified shell is reliably generated within the mold, allowing the ingot to be pulled out downward in a good condition.

また上記のＨ及びＤを十分大きくしておくと。Also, if the above H and D are made sufficiently large.

鋳造開始時に溶融金属の上表面が急上昇して来ても、或
は溶融金属玉が跳ね上っても第４図のようにノズルと鋳
型との空間内で溶融金属が凝固し気体の通路を塞ぐよう
なことが起きない。しかし上記のＤ値は、これを余り大
きくするとノズル内径が小さくなり、溶融金属の供給速
度が低下して好ましくない。本発明者らの実験によれば
、鋼の連続鋳造の場合にＤは２＋ａ以上で、Ｈ／Ｄが１
以上のとすれば、ノズルと鋳型との空間内で溶融金属が
凝固しないことを確認している・ 〔発明の実施例〕 本発明を鋼の連続鋳造に実施した例を以下に説明する。Even if the upper surface of the molten metal rises rapidly at the start of casting, or even if a molten metal ball jumps up, the molten metal solidifies in the space between the nozzle and the mold as shown in Figure 4, and the gas passage is blocked. Nothing that blocks it will happen. However, if the above D value is too large, the inner diameter of the nozzle becomes small and the supply rate of molten metal decreases, which is not preferable. According to experiments by the inventors, in the case of continuous steel casting, D is 2+a or more and H/D is 1.
Based on the above, it has been confirmed that the molten metal does not solidify in the space between the nozzle and the mold. [Embodiments of the Invention] An example in which the present invention is applied to continuous casting of steel will be described below.

装置には前出の第３図に示したものを使用した。鋳型の
内径は３５ｍ−高さは７００ｔｍとし、Ｄ＝２ｍｍ、Ｈ
＝　３　ｔｔｒｒａとした。吹込む気体には窒素ガスを
使用し−１００ｃＩｎ”／ｍｉＣの速度で吹込んだ。溶
鋼には炭素が０．２チ・珪素が０．３俤、マンガンが０
．５％を含有するものを準備し。The apparatus shown in Figure 3 above was used. The inner diameter of the mold is 35m - the height is 700tm, D = 2mm, H
= 3 ttrra. Nitrogen gas was used as the gas to be blown in, and it was blown in at a rate of -100 cIn"/miC. The molten steel contained 0.2 T of carbon, 0.3 T of silicon, and 0 of manganese.
．． Prepare one containing 5%.

１５５０ｔ：の温度で注入した。It was injected at a temperature of 1550t.

その結果、鋳造開始時にノズルと鋳型との間で溶鋼が凝
固せずにｇｍ／ｍｉｎ　の速度で連続鋳造することがで
きた。As a result, continuous casting was possible at a speed of gm/min without the molten steel solidifying between the nozzle and the mold at the start of casting.

なおノズル部のない、つまりＨ＝００従来の方法によっ
て・ヘッダと鋳凰との隙間を０．２ｍとし、更に第２図
の蓋３を各種材質をとりあげ実験してみたが、鋳造開始
時に溶鋼がヘッダと鋳型との隙間に浸入して凝固し連続
鋳造できない場合がしばしば起ることを確認している。In addition, we used the conventional method without a nozzle, that is, H = 0. The gap between the header and the casting hood was set to 0.2 m, and we also experimented with various materials for the lid 3 in Fig. 2. It has been confirmed that there are many cases where continuous casting cannot be carried out due to solidification of solidified metal particles that enter the gap between the header and the mold.

〔発明の効果〕〔Effect of the invention〕

本発明によれば鋳造開始時にヘッダと鋳型との間に溶融
金属を凝固させるようなことがなく、シかも確実に凝固
殻を鋳型内で生成させることにより、連続鋳造できる効
果がある。According to the present invention, there is no need to solidify molten metal between the header and the mold at the start of casting, and a solidified shell is reliably generated within the mold, thereby enabling continuous casting.

なお本発明は鋼の連続に実施して、その効果を確認して
いるが、アルミニウム、銅、その他金属の連続鋳造の鴨
合にも適応可能である。Although the present invention was carried out on continuous steel and confirmed its effectiveness, it is also applicable to continuous casting of aluminum, copper, and other metals.

【図面の簡単な説明】 第１図、第２図は従来の連続鋳造装置の縦断面図、第３
図、第４図は本発明の連続鋳造装置の縦断面図である。 １・・・溶融金属、２・・・ヘッダ、３・・・空隙、４
・・・冷却水・５・・・鋳型、６・・・鋳塊、７・・・
ダミーバ、訃・・蓋。 第　１　図 ！ ％２　口 ＼ 第３図 第４図[Brief explanation of the drawings] Figures 1 and 2 are vertical cross-sectional views of a conventional continuous casting device, and
4 are longitudinal sectional views of the continuous casting apparatus of the present invention. 1... Molten metal, 2... Header, 3... Void, 4
...Cooling water・5...Mold, 6...Ingot, 7...
Damiba, death...lid. Figure 1! %2 Mouth＼ Figure 3 Figure 4

Claims (1)

【特許請求の範囲】 １、垂直鋳型の上部から金属溶湯をノズルによって供給
する金属の連続鋳造法において、上記鋳型とノズルとの
間に気体を導入して、ノズル外周の金属溶湯をノズル先
端まで押し下げるようにすることを特徴とする金属の連
続鋳造法。 λ　ノズルと鋳型との距離をＤ、鋳型上端とノズル先端
との距離をＩ（とした場合、少なくともＨ＞Ｄとしたこ
とを特徴とする特許請求の範囲第１項記載の金属の連続
鋳造法。[Scope of Claims] 1. In a continuous metal casting method in which molten metal is supplied from the top of a vertical mold through a nozzle, gas is introduced between the mold and the nozzle to cause the molten metal on the outer periphery of the nozzle to reach the tip of the nozzle. A continuous metal casting method characterized by pressing down. λ The continuous metal casting method according to claim 1, characterized in that the distance between the nozzle and the mold is D, and the distance between the upper end of the mold and the nozzle tip is I (where H>D at least. .