JPS58157562A - Continuous casting installation - Google Patents

Abstract

PURPOSE:To provide a continuous casting device which prevents the decrease in the temps. in both end parts of an ingot, by the constitution wherein the corner parts at both ends in the transverse direction of the ingot are screwed down and are prevented from contacting guide rolls on the upper stream side from the part near the point where the solidification of the ingot is completed. CONSTITUTION:Screw down rolls 8 for screwing down the corner parts at both ends in the transverse direction of an ingot 6 are installed at least one on the upper stream side from the part near the point where the solidification of the ingot 6 is completed, in a curved type continuous casting installation wherein the molten steel 3 in ladle 1 is charged into a casting mold 4 through a tundish 2, is curved downward and is drawn continuously as an ingot 6 from the lower part of said mold by means of many ingot guide rolls 6 and the completely solidified ingot 6 is cut at a prescribed length with a cutter 7. Said rolls 8 are mounted freely rotatably with roll bodies 8b having tapered screw-down faces on the stationary central shafts 8a and screw down the corner parts of the ingot 6 guided by guide rolls 11 at the rolling reduction that can be varied as desired by means of cylinders 10, thereby preventing the contact of the ingot with the rolls 5.

Description

【発明の詳細な説明】 この発明は、連続鋳造設備、特に高温鋳片の鋳造が可能
な湾曲形連続鋳造設備に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to continuous casting equipment, particularly to a curved continuous casting equipment capable of casting high-temperature slabs.

湾曲形連続鋳造設備における鋳片の鋳造態様の概要で第
１図全参照しながら説明する。An overview of the method of casting slabs in curved continuous casting equipment will be explained with full reference to FIG. 1.

取鍋ｌからタンディツシュ２に注入された溶鋼３は、タ
ンディツシュ２から鋳型４に注入される。The molten steel 3 injected from the ladle l into the tundish 2 is injected from the tundish 2 into the mold 4.

鋳型４に注入された溶鋼３は、鋳型４の下部力１ら多数
の鋳片案内ロール５によって下方に湾曲されつつ連続的
に引贋抜かれる。この後鋳片６は、次第に水平に矯正さ
れ、完全に凝固した鋳片６は切断装置７によって所定長
さに切断され、次工程に搬送される。The molten steel 3 injected into the mold 4 is continuously drawn out while being curved downward by a large number of slab guide rolls 5 from the lower force 1 of the mold 4. After this, the slab 6 is gradually straightened horizontally, and the completely solidified slab 6 is cut into a predetermined length by a cutting device 7 and transported to the next process.

ところで、従来切断機６によって所定長さに切断された
鋳片は、一旦常温まで冷却された後流域り等が行なわれ
、この後加熱炉によって再加熱され、次工程の圧延ライ
ンに搬送されるのが一般的であった。By the way, the slab cut into a predetermined length by the conventional cutting machine 6 is once cooled to room temperature, subjected to a downstream flow, etc. After that, it is reheated in a heating furnace and transported to the rolling line for the next process. was common.

しかし、上記方法では切断直後の９００℃以上の高温鋳
片を常温まで冷却するための冷却設備および疵取り等が
行なわれた鋳片を再加熱するための加熱炉が必要とされ
るので、多額の設備費を要するとともに多大のエネルギ
ーロスにもなっていた。However, the above method requires cooling equipment to cool the high temperature slab of 900°C or higher to room temperature immediately after cutting, and a heating furnace to reheat the slab after removing defects, etc. In addition to requiring equipment costs, it also resulted in a large amount of energy loss.

そこで、近年、鋳造方法の種々の改善によシ鋳片の疵取
りが不要となったこと等の理由によシ、上記設備費の削
減および省エネルギー等を目的として、切断直後の高温
鋳片を常温に冷却することなく、その！、ま直接圧延ラ
インに搬送する、所謂。Therefore, in recent years, various improvements in casting methods have made it unnecessary to remove defects from cast slabs, and for the purpose of reducing the above equipment costs and saving energy, high-temperature slabs are used immediately after cutting. That without cooling to room temperature! , or conveyed directly to the rolling line.

ホットダイレクトローリング（ＨＤＲ）が一部試みられ
ている。Some attempts have been made to use hot direct rolling (HDR).

上記ホットダイレクトローリングを実施するには結局、
鋳片の温度低下を防止すれば良いのであり１例えば、実
開昭５４−１８０４１５号や実開昭５４−１８０４１６
号公報等に鋳片の温度低下を防止する保熱装置が提案さ
れている。In the end, to carry out the above hot direct rolling,
All that is required is to prevent the temperature of the slab from decreasing.
A heat retaining device for preventing a drop in temperature of a cast slab has been proposed in Japanese Patent Publication No.

しかし、上記従来の保熱装置では、鋳片案内ロールと鋳
片との接触に↓る鋳片両端部の温度低下を防止すること
ができないとともに、鋳片サイズか異なった場合には同
一の保熱装置を使用することかできないといった問題が
あった。However, with the conventional heat retention device described above, it is not possible to prevent the temperature drop at both ends of the slab due to the contact between the slab guide roll and the slab. There was a problem in that it was impossible to use a thermal device.

この発明は、上記問題点を解決するための連続鋳造設備
を提供するものであって、鋳片の巾方向両端のコーナ一
部を圧下するための圧下ロールが鋳片凝固完了点近傍か
ら上流側に少なくとも１つ設置されていることに特９ｆ
ｆｉ有する。The present invention provides continuous casting equipment for solving the above-mentioned problems, in which the reduction rolls for rolling down part of the corners at both ends of the slab in the width direction are arranged on the upstream side from the vicinity of the solidification completion point of the slab. It is especially important that at least one is installed in the 9th floor.
have fi.

この発明ケ実施例により図面を参照しなから脱− 明する。By way of embodiments of this invention, reference is made to the drawings. I will clarify.

第２図は、この発明の実施例の概略構成図、第３図は、
第２図のＡ−Ａ線断面図である。FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 3 is a
FIG. 3 is a sectional view taken along line A-A in FIG. 2;

第２図中、第１図と同一番号は同一物を示す。In FIG. 2, the same numbers as in FIG. 1 indicate the same items.

第２図および第３図において、８は、鋳片凝固完了点（
クレータエンド〕近傍の鋳片巾方向両側端に鋳片６を挾
んで上下に一対設置された圧下ロールである。圧下ロー
ル８の各々は、固定中心軸８ａ　　にテーパー状の圧下
面を有するロール本体８ｂ會回転自在に取付けたもので
なシ、中心軸８ａの一端は鋳片凝固完了点近傍に設置さ
れたロール支持フレーム９にシリンダ１０を介して堰付
けられ、他端は前記フレーム９に回動自在に取付けられ
ている。従って、シリンダｌＯｆ：作動させれば圧下ロ
ール８は中心軸８ａの他端を中心として上下に回動し、
鋳片コーナ一部の圧下量を自由に変化させることができ
る。１１は、圧下ロー〜８の間に設置された１対の鋳片
案内ロールであシ、圧力ロール８間に設置されているの
で他の鋳片案内ロール５よｐ当然短かくなっている。In Fig. 2 and Fig. 3, 8 indicates the slab solidification completion point (
A pair of roll-down rolls are installed above and below the slab 6 at both ends in the width direction of the slab near the crater end. Each of the reduction rolls 8 has a fixed center shaft 8a and a roll main body 8b having a tapered reduction surface, which is rotatably attached to the center shaft 8a. It is attached to the support frame 9 via a cylinder 10, and the other end is rotatably attached to the frame 9. Therefore, when the cylinder lOf: is activated, the reduction roll 8 rotates up and down about the other end of the central shaft 8a,
The reduction amount of a part of the slab corner can be freely changed. Reference numeral 11 denotes a pair of slab guide rolls installed between the reduction row and the roll 8, and since they are installed between the pressure rolls 8, they are naturally shorter than the other slab guide rolls 5.

４− 鋳型４から引ま抜かれた鋳片６が圧下ロール８位置にく
ると、圧下ロール８によってコーナ一部が圧下される。4- When the slab 6 pulled out from the mold 4 comes to the position of the reduction roll 8, a part of the corner is rolled down by the reduction roll 8.

従って、第４図に示さ九るように、圧下ロール８から下
流側では鋳片６の両側端部に鋳片案内ロール５が接触せ
ず、この結果、鋳片６の両側端部の温度低下が防止され
る。Therefore, as shown in FIG. 4, the slab guide rolls 5 do not come into contact with both ends of the slab 6 on the downstream side from the reduction roll 8, and as a result, the temperature at both ends of the slab 6 decreases. is prevented.

圧下ロール８による鋳片コーナ一部の圧下範囲は、鋳片
巾方向端部から鋳片内側に３００　ｍｍ以内で、圧下量
は鋳片の凝固界面の歪量が１．０％以下で、鋳片厚さ方
向で５關以上となるような圧下量とする。これは、３０
０ｍｍを越える圧下範囲とすると、鋳片端部の冷却が不
充分となシすぎて鋳片の最終凝固部分が鋳片両端に集中
し、内質欠陥が増加するからであシ、一方、鋳片厚さ方
向の圧下量金５ｎ未満どすると、鋳片案内ロール５との
接触量を減少させることによる鋳片温度の低下防止が十
分に図れない。The reduction range of a part of the corner of the slab by the reduction roll 8 is within 300 mm from the end in the width direction of the slab to the inside of the slab, and the amount of reduction is such that the strain at the solidification interface of the slab is 1.0% or less, and The amount of reduction shall be 5 degrees or more in the thickness direction of one side. This is 30
If the reduction range exceeds 0 mm, cooling of the ends of the slab will be insufficient, and the final solidified portion of the slab will concentrate at both ends of the slab, increasing internal defects. If the reduction amount in the thickness direction is less than 5n, the temperature of the slab cannot be sufficiently prevented from decreasing by reducing the amount of contact with the slab guide roll 5.

上記実施例は、圧下ロールを鋳片凝固完了点近傍に１つ
設置したものであるが、圧下ロールを鋳片凝固完了点近
傍から上流側に複数個設置し、上５− 流側の圧下ロールから下流側の圧下ロールに向うにした
がい順次圧下量を大きくして行き、鋳片凝固完了点近傍
に設置した圧下ロールによって最終的に所望の圧下量を
鋳片・コーナ一部に付与するようにすれば、鋳片凝固完
了点近傍から上流側においても鋳片案内ロールと鋳片両
側端との接触量の減少が図れ、より一層の鋳片温度の低
下防止が図れる。In the above embodiment, one reduction roll is installed near the point at which the solidification of the slab is completed, but a plurality of reduction rolls are installed upstream from the vicinity of the point at which the slab solidification is completed. From there, the reduction amount is gradually increased toward the reduction rolls on the downstream side, and the desired reduction amount is finally applied to part of the corner of the slab by the reduction roll installed near the point where the slab solidification is completed. This makes it possible to reduce the amount of contact between the slab guide rolls and both ends of the slab even upstream from the vicinity of the slab solidification completion point, thereby further preventing a drop in slab temperature.

鋳片サイズを変更した場合には、上述の圧下範囲および
圧下量となるようにシリンダ１ｏを操作して圧下ロール
８の傾斜角度を変える。When changing the slab size, the cylinder 1o is operated to change the inclination angle of the reduction roll 8 so that the above-mentioned reduction range and amount are achieved.

以上説明したように、この発明によれば、鋳片案内ロー
ルと鋳片との接触による鋳片両端部の温度低下を、鋳片
サイズに無関係に防止することができるといった効果が
もたらされる。As explained above, according to the present invention, it is possible to prevent a temperature drop at both ends of the slab due to contact between the slab guide roll and the slab, regardless of the size of the slab.

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

第１図は、従来の連続鋳造設備の概略構成図、第２図は
、この発明の実施例の概略構成図、第３図は、第２図の
Ａ−Ａ線断面図、第４図は、鋳片６− 案内ロールと鋳片との接触状態勢を示す正面図である。 図面において、 １・・・取鍋　　　　　　　２・・・タンディツシュ３
・・・溶鋼　　　　　　　４・・・鋳型５．１１・・・
鋳片案内ロール　　６・・・鋳片７・・・切断装置　　
　　　８・・・圧下ロール８ａ・・・中心軸　　　　　
　８ｂ・・・ロール本体９・・・ロール支持フレ　　１
０・・・シリンダ出願人　　日本鋼管株式会社 代理人　　堤　　敬太部（池１名） ３　　　　　　　第１図 ７− 第３図Fig. 1 is a schematic diagram of a conventional continuous casting equipment, Fig. 2 is a schematic diagram of an embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a schematic diagram of a conventional continuous casting equipment. , slab 6 - is a front view showing the state of contact between the guide roll and the slab. In the drawing, 1...Ladle 2...Tandish 3
... Molten steel 4... Mold 5.11...
Slab guide roll 6... Slab 7... Cutting device
8... Reduction roll 8a... Center shaft
8b...Roll body 9...Roll support frame 1
0...Cylinder applicant: Nippon Kokan Co., Ltd. Agent: Keitabe Tsutsumi (1 person: Ike) 3 Figure 1 7- Figure 3

Claims (1)

【特許請求の範囲】[Claims] 湾曲形連続鋳造設備において、鋳片の中方向両端のコー
ナ一部を圧下するだめの圧下ロールが鋳片凝固完了点近
傍から上流側に少なくとも１つ設置されていること金特
徴とする連続鋳造設備。Continuous casting equipment characterized in that, in curved continuous casting equipment, at least one reduction roll for rolling down a part of the corners of both ends in the middle direction of the slab is installed upstream from the vicinity of the solidification completion point of the slab. .