JPS5913559A - Method for controlling timing for changing billet width during continuous casting - Google Patents

Abstract

PURPOSE:To stabilize the operation for casting and to improve yield by adjusting the timing for changing billet width beforehand in synchronization with the fluctuation in the billet drawn if the drawing of the billet in conformity with the casting instruction is infeasible during continuous casting. CONSTITUTION:An ingot 5 under casting is detected at all times at the intended cutting lengths of slabs 5a-5c by a computer which controls the timing for changing billet width. The molten metal above a casting mold 3 which is not solidified yet to a billet is also detected as an extension of the intended cutting length for the slab near the lower part of the casting mold. If the intended cutting length L that the slab 5b under continuous casting possesses becomes shorter by a length l, the timing Lx for changing billet width which is detected just before the same is corrected with Lx-l as a fresh Lx1 by the control of the timing for changing billet width and is freshly detected again, whereby the width of the billet is changed without deviation in the position from the slab which is intended to be changed.

Description

【発明の詳細な説明】 本発明は可変幅鋳型で鋳片を餉込む連続鋳造設備におけ
る鋳造中の鋳片幅変更タイミング制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the timing of changing the slab width during casting in continuous casting equipment in which slabs are cast using a variable width mold.

連続鋳造設備の中には鋳型の幅が鋳片の連続鋳造操業中
に任意且つ自動的に縮小又は拡大等変えられる可変幅鋳
型タイプがあり、これは異なる製品に対する異なる幅の
鋳片奢鋳造する際に鋳型交換の手間が省けるばかりか、
連続的に鋳込むことが可能であり、非常に生産効率の高
い連続鋳造方法である。Among continuous casting equipment, there is a variable width mold type in which the width of the mold can be arbitrarily and automatically changed during the continuous casting operation of slabs, such as shrinking or expanding, and this is used to cast slabs of different widths for different products. Not only does it save you the trouble of replacing the mold when needed,
It is a continuous casting method that allows continuous casting and has extremely high production efficiency.

従来、連続鋳造中における鋳片幅変更タイミングは、あ
らかじめ作成された鋳造命令通り行なわれ、且つ採片（
ここで採片と称するのは鋳片を成品寸法に合わせて特定
の長さで切断することをいう）も命令通シ行なわれてき
た。しかし鍋・ノズル交換等で発生する不良鋳片部分、
あるいは幅変更位置が予定位置からずれた時、及びカシ
ターミス切断等鋳造命令通りの採片が不可能な場合には
、結果的に鋳片幅不一致により注文歩留り低下の一因−
となった。Conventionally, the timing of changing slab width during continuous casting was carried out according to casting instructions created in advance, and the timing of changing slab width during continuous casting was
Here, the term "sampling" refers to cutting slabs to specific lengths to match the dimensions of the finished product), which has also been done by order. However, defective slab parts that occur when replacing pots and nozzles, etc.
Alternatively, when the width change position deviates from the planned position, or when it is impossible to collect slabs according to the casting instructions due to miscutting, etc., the resulting mismatch in slab width may cause a decrease in order yield.
It became.

さらに近年設備の直行化ニーズによりリアルタイムで注
文判定し、合格鋳片については次圧延工程へ直送するノ
ステム化が進行しているが、この場合注文判定結果不合
格時に注文歩留向上の為に採片長を余材（非注文材のこ
とをいう）長に変更したり振替えしたり、再採用しよう
とすると同様の問題が生じる。Furthermore, in recent years, due to the need for straight line equipment, there has been a trend toward a system in which orders are judged in real time and passed slabs are sent directly to the next rolling process. A similar problem will occur if you try to change or transfer the length of one piece to the length of surplus material (referring to non-customized material), or to re-adopt it.

本発明は、かかる不具合を有利に解消しうる鋳片幅変更
タイミング制御方法を提供しようとするものであり、そ
の要旨とするところは連続鋳造中において鋳造命令通り
の採用ができない場合に、その採用の変動に同期させて
事前に鋳片幅変更タイミングの調節を行なうことを特徴
とする連続鋳造中における鋳片幅変更タイミング制御方
法である。The present invention aims to provide a timing control method for changing slab width that can advantageously eliminate such problems. This is a method of controlling slab width change timing during continuous casting, characterized in that the timing of changing slab width is adjusted in advance in synchronization with fluctuations in .

以下に本発明を図面に示す実施例で詳細に説明する。The present invention will be explained in detail below with reference to embodiments shown in the drawings.

第１図及び第２図は鋳造幅可変タイミング制御方法を示
すものである。1 and 2 show a casting width variable timing control method.

第１図において現状の鋳造長を測長ロール４で測定し、
その信号からスラブ切断装置７への切断命令を計算機］
０から出力する。計算機１０は鋳型３の１駆動タイミン
グも計り電気制御装置８を介して鋳型３を駆動する。し
かして鋳造中の鋳片５は鋳片幅変更タイミング制御を行
なう計′ＪＩ１．機によってスラブ５８〜５Ｃの切断予
定長で常時把握される。更に鋳片に至ら々い鋳型３より
上刃の溶姥１に対しても鋳型の下方寄りのスラブ切断予
定長さ本発明方法では、この鋳片幅変更タイミンクＬ　
ｘについて以下に記述するような手段により最適化し鋳
片幅変更タイミング制御の大幅な信頼性向上と高度な適
中率を得ることができる。In Fig. 1, the current casting length is measured with length measuring roll 4,
The computer sends a cutting command to the slab cutting device 7 from the signal]
Output from 0. The computer 10 also measures the driving timing of the mold 3 and drives the mold 3 via the electric control device 8. Therefore, the slab 5 during casting is controlled by the timing control for changing the width of the slab. The planned cutting length of the slabs 58 to 5C is always grasped by the machine. Furthermore, in the method of the present invention, the slab width change timing L
By optimizing x by the means described below, it is possible to significantly improve the reliability of slab width change timing control and obtain a high accuracy rate.

第１図において連鋳内のスラブ５ｂか持つ切断予定長り
か長さしたけ短かくなった場合、この直前まで把握して
いた鋳片幅変更タイミングＬｘは、鋳片幅変更タイミン
グ制御により（Ｌｘ　　ｔ）を箔］たなＬｘＩとして補
正し、妨だに把握し直すことで可変を予定していたスラ
ブから位置ズレを起すことなく鋳片幅変更が実施できる
。In Fig. 1, when the planned cutting length of the slab 5b in continuous casting becomes shorter, the slab width change timing Lx, which was known until just before this, is changed by the slab width change timing control (Lx By correcting t) as a foil plate LxI and reconsidering the obstacles, it is possible to change the width of the slab without causing any deviation from the position of the slab that was planned to be changed.

また本発明による上述の例は連鋳機内の切断予定長が変
化した例について記述したが、この場合も切合せ後スラ
ブの切断予定長とスラブ枚数より貴度鋳造幅変更タイミ
ングを求めるものである。Furthermore, the above-mentioned example according to the present invention describes an example in which the scheduled cutting length in the continuous casting machine changes, but in this case as well, the timing of changing the nobleness casting width is determined from the scheduled cutting length of the slab after cutting and the number of slabs. .

また本発明は下記の様なケースにおいても適用される。The present invention is also applicable to the following cases.

計算機からオペレータ若しくは外部割算機に対してスラ
ブの寸法品質に関する各種因子（例えば幅耳部で使用さ
れた潤滑用パウダ一種類）を提供して、それらが注文さ
れているスラブの品種と比較し、その結果不合格となり
計算機に再入力芒れスラブの採用長をリアルタイムに余
利長に変更する場合、丑だ上記方法により判定した結果
他のスラブへの振り替えとなり採用長をリアルタイムに
変更する場合、またスラブ切断機でのミス切断等によシ
予定以外の位置で切断された場合、尚、本発明では連餉
機内ＬＢ−ＬＭ間のスラブ切断予定長が変化した際に必
らずしも鋳片幅変更タイミングＬｘを補正するのではな
く連鋳機内の鋳片５内のスラブ切断長の変更により位置
ズレの長さｔ’Ｌ吸収出来た場合には鋳片幅変更タイミ
ングＬｘを補正しない。また鋳片幅変更タイミングまで
の残り鋳造長が少なくなった時点（例えば残長３ｍ以下
になった場合）においては鋳片幅変更タイミングの補正
ケ強制的に停止させる機能を伺加することにより、鋳造
作業の安定化を図り鋳片幅変更制御として計算機による
完全な自動制御で実行することができ、注文歩留りにつ
いても従来と比べ約２％向上することができだ。The computer provides the operator or external divider with various factors related to the dimensional quality of the slab (for example, one type of lubricating powder used in the width edge) and compares them with the type of slab ordered. If the result is a failure and the slab is re-entered into the calculator and the adopted length of the slab is changed to the surplus length in real time, if the result of judgment using the above method is transferred to another slab and the adopted length is changed in real time. In addition, if the slab is cut at a position other than the planned one due to a cutting error in the slab cutting machine, etc., in the present invention, it is not always necessary to cut the slab at a position other than the planned cutting length between LB and LM in the continuous cutting machine. Instead of correcting the slab width change timing Lx, if the positional deviation length t'L can be absorbed by changing the slab cutting length in the slab 5 in the continuous casting machine, the slab width change timing Lx will not be corrected. . In addition, we have added a function that forcibly stops correction of the slab width change timing when the remaining casting length until the slab width change timing becomes small (for example, when the remaining length is 3 m or less). In order to stabilize casting operations, slab width change control can be executed completely automatically using a computer, and the order yield can be improved by approximately 2% compared to conventional methods.

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

第１図は連続鋳造設備概要と鋳片との対応を示す図、第
２図は鋳片の形状を示ｆ図である。 ｌ・・・・・・取鍋 ２・・・・・・タンディツシュ ３・・・・・・鋳型 ４・・・・・・鋳造長測長ロール ５・・・・・・鋳片 ５ａ〜５ｄ・・・切断予定スラブ ６ａ〜６ｄ・・・鋳造予定の鋳片形状 ７・・・　　・・スラブ切断装置 ８・・・・　・・電気制御装置 ９・・・・　・・鋳型駆動装置 ］、０・・・　・・計算機 出　願　人　新日本製鐵株式会社FIG. 1 is a diagram showing the outline of continuous casting equipment and the correspondence with slabs, and FIG. 2 is a diagram f showing the shape of the slabs. l... Ladle 2... Tundish 3... Mold 4... Casting length measuring roll 5... Slabs 5a to 5d. ...Slabs to be cut 6a to 6d...Slab shape to be cast 7...Slab cutting device 8...Electric control device 9...Mold drive device], 0. ... Computer applicant Nippon Steel Corporation

Claims (1)

【特許請求の範囲】[Claims] 連続鋳造中において、鋳造命令通りの採片ができない場
合に、その採片の変動に同期させて事前に鋳片幅変更タ
イミングの調節を行なうことを特徴とする連続鋳造中に
おける鋳片幅変更タイミング制御方法。During continuous casting, when a slab cannot be sampled according to casting instructions, the timing of changing slab width is adjusted in advance in synchronization with fluctuations in the sampling. Control method.