JP2010167438A - Method of sawing crop of rolled stock - Google Patents

Method of sawing crop of rolled stock Download PDF

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JP2010167438A
JP2010167438A JP2009011400A JP2009011400A JP2010167438A JP 2010167438 A JP2010167438 A JP 2010167438A JP 2009011400 A JP2009011400 A JP 2009011400A JP 2009011400 A JP2009011400 A JP 2009011400A JP 2010167438 A JP2010167438 A JP 2010167438A
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rolled material
crop
rolling
mill
sawing
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JP5458580B2 (en
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Yasuyuki Takeuchi
靖之 竹内
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of sawing a crop of a rolled stock, by which the efficiency of a rolling line is improved. <P>SOLUTION: When sawing the crop of the rolled stock with a THS (sawing machine) 14 on the inlet side of an R2 mill 15, by sawing the bottom crop of the succeeding rolled stock 2 before the top crop, the succeeding rolled stock 2 is quickly fed toward the R2 mill 15 when completing the rolling of a preceding rolled stock 1. When the number of rolling passes of the preceding rolled stock 1 is not more than the predetermined number or the rolling time of the preceding rolled stock 1 is not more than the predetermined time, by taking the sum of the length of the preceding rolled stock 1 and the length from the leading edge in the feeding direction of the succeeding rolled stock 2 to the sawing position of the bottom crop as smaller than the distance between the R2 mill 15 and THS 14, the bottom crop of the succeeding rolled stock 2 is sawn before the top crop. When rolling the preceding rolled stock 1 toward the outlet side, the succeeding rolled stock 2 is sent out and the bottom crop is sawn and, when rolling the preceding rolled stock 1 toward the inlet side, the succeeding rolled stock 2 is returned and the top crop is sawn. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、圧延機の入側に設けられた鋸断機で圧延材のクロップを鋸断する圧延材のクロップ鋸断方法に関するものであり、例えばＨ型鋼の粗ミルの入側でクロップを鋸断するのに好適なものである。   TECHNICAL FIELD The present invention relates to a rolling material crop cutting method in which a rolled material crop is sawed by a sawing machine provided on the inlet side of a rolling mill. For example, the crop is sawed on the inlet side of a coarse H-shaped steel mill. It is suitable for cutting off.

例えば素材を圧延してＨ型鋼を製造する場合、圧延材搬送方向先端部及び後端部のクロップが圧延機咬み込み不良の原因となる。そこで、下記特許文献１では、例えば圧延材の最初の圧延機であるブレークダウンミルから払い出された圧延材の先端部のトップクロップ及び後端部のボトムクロップを、粗圧延機の入側に設けられた鋸断機（トングホットソー等ともいう）で鋸断し、後工程の圧延機での咬み込み不良を抑制防止するようにしている。   For example, when rolling a raw material and manufacturing H-shaped steel, the crop of the rolling material conveyance direction front-end | tip part and rear-end part causes a rolling mill biting defect. Therefore, in the following Patent Document 1, for example, the top crop at the front end and the bottom crop at the rear end of the rolled material discharged from the breakdown mill which is the first rolling mill of the rolled material are placed on the entry side of the roughing mill. Saw cutting is performed with a provided sawing machine (also referred to as a tong hot saw or the like) to suppress and prevent biting defects in a subsequent rolling mill.

特開２００１−２８６９０９号公報JP 2001-286909 A

ところで、例えばＨ型鋼の圧延ラインに設けられた鋸断機では、圧延材の送給方向に沿って、先に圧延材の送給方向先端部のトップクロップを鋸断し、次いで圧延材を送給方向に送って、送給方向後端部のボトムクロップを鋸断するのが一般的である。しかしながら、この鋸断方法では、先行圧延材の圧延機による圧延が完了し、後行圧延材を圧延機に向けて払い出し可能な状態であるにもかかわらず、圧延機の手前で後行圧延材を停止してボトムクロップを鋸断しなければならず、その分だけ、ラインの生産効率が低いという問題がある。
本発明は、上記のような問題点に着目してなされたものであり、ラインの生産効率を向上可能な圧延材のクロップ鋸断方法を提供することを目的とするものである。 By the way, in a sawing machine provided in a rolling line for H-shaped steel, for example, the top crop at the front end of the rolling material in the feeding direction is first cut along the feeding direction of the rolling material, and then the rolling material is fed. It is common to feed in the feed direction and saw the bottom crop at the rear end of the feed direction. However, in this sawing method, although the rolling of the preceding rolled material is completed by the rolling mill and the succeeding rolled material can be discharged to the rolling mill, the succeeding rolled material is placed in front of the rolling mill. And the bottom crop must be sawn, and the production efficiency of the line is low accordingly.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a rolled material crop sawing method capable of improving the production efficiency of a line.

上記課題を解決するために、本発明の圧延材のクロップ鋸断方法は、圧延機の入側に設けられた鋸断機で圧延材のクロップを鋸断する圧延材のクロップ鋸断方法であって、圧延材の送給方向後方のボトムクロップを、当該圧延材の送給方向先方のトップクロップよりも先に鋸断することを特徴とするものである。
なお、本発明の「鋸断」は「切断」に等しい。 In order to solve the above-mentioned problems, the rolled material crop sawing method of the present invention is a rolled material crop sawing method in which a rolled material crop is sawn by a sawing machine provided on the entrance side of the rolling mill. Thus, the bottom crop behind the rolled material in the feed direction is sawed before the top crop ahead in the feed direction of the rolled material.
The “saw cutting” of the present invention is equivalent to “cutting”.

また、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいときに、後行圧延材の送給方向後方のボトムクロップを、当該後行圧延材の送給方向先方のトップクロップよりも先に鋸断することを特徴とするものである。
また、先行圧延材の圧延機パス回数が所定回数以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいと判断することを特徴とするものである。 Further, when the sum of the length of the preceding rolled material and the length from the leading end of the subsequent rolled material that saws the crop to the bottom crop sawing position is smaller than the distance between the rolling mill and the sawing machine The bottom crop behind the subsequent rolled material in the feeding direction is sawed before the top crop ahead in the feeding direction of the subsequent rolled material.
Further, when the number of rolling mill passes of the preceding rolled material is equal to or less than the predetermined number of times, the length of the preceding rolled material and the length from the leading end of the succeeding rolled material to cut the crop to the bottom crop sawing position The sum is determined to be smaller than the distance between the rolling mill and the saw cutter.

また、先行圧延材の圧延機圧延時間が所定時間以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいと判断することを特徴とするものである。
また、前記先行圧延材の送給方向先方への圧延時に後行圧延材を圧延機側に送り出して送給方向後方のボトムクロップを鋸断し、次いで先行圧延材の送給方向後方への圧延時に後行圧延材を圧延機側から送り戻して送給方向先方のトップクロップを鋸断することを特徴とするものである。 Further, when the rolling mill rolling time of the preceding rolled material is equal to or less than a predetermined time, the length of the preceding rolled material and the length from the leading end of the succeeding rolled material for cutting the crop to the bottom crop sawing position The sum is determined to be smaller than the distance between the rolling mill and the saw cutter.
Further, when rolling the preceding rolling material forward in the feeding direction, the subsequent rolling material is sent to the rolling mill side, and the bottom crop behind the feeding direction is sawn, and then the preceding rolling material is rolled backward in the feeding direction. Sometimes, the subsequent rolled material is fed back from the rolling mill side, and the top crop in the feed direction is sawn.

而して、本発明の圧延材のクロップ鋸断方法によれば、圧延機の入側に設けられた鋸断機で圧延材のクロップを鋸断するにあたり、圧延材の送給方向後方のボトムクロップを、当該圧延材の送給方向先方のトップクロップよりも先に鋸断することとしたため、先行圧延材の圧延機による圧延が完了し、後行圧延材を圧延機に向けて払い出し可能な状態である場合に、後行圧延材を圧延機に向けて速やかに送給することが可能となり、その分だけ、ラインの生産効率を向上することが可能となる。   Thus, according to the method for cutting a rolled material according to the present invention, when cutting the rolled material with a saw provided on the entrance side of the rolling mill, Since the crop was sawed before the top crop ahead of the rolling direction of the rolled material, rolling of the preceding rolled material by the rolling mill was completed, and the succeeding rolled material could be delivered to the rolling mill. In this state, it is possible to quickly feed the subsequent rolled material toward the rolling mill, and the production efficiency of the line can be improved accordingly.

また、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、圧延機と鋸断機との距離より小さいときに、後行圧延材の送給方向後方のボトムクロップを、当該後行圧延材のトップクロップよりも先に鋸断することとしたため、先行圧延材に干渉することなく、後行圧延材の送給方向後方のボトムクロップを鋸断することができる。   In addition, when the sum of the length of the preceding rolled material and the length from the leading end of the subsequent rolled material that saws the crop to the bottom crop sawing position is smaller than the distance between the rolling mill and the sawing machine, Since the bottom crop behind the feeding direction of the succeeding rolled material is cut before the top crop of the succeeding rolled material, the feeding direction of the succeeding rolled material without interfering with the preceding rolling material The rear bottom crop can be sawed.

また、先行圧延材の圧延機パス回数が所定回数以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、圧延機と鋸断機との距離より小さいと判断することとしたため、後行圧延材の送給方向後方のボトムクロップ鋸断時の先行圧延材との干渉を簡易に回避することができる。   Further, when the number of rolling mill passes of the preceding rolled material is equal to or less than the predetermined number of times, the length of the preceding rolled material and the length from the leading end of the succeeding rolled material to cut the crop to the bottom crop sawing position Since the sum is determined to be smaller than the distance between the rolling mill and the sawing machine, it is possible to easily avoid interference with the preceding rolling material at the time of bottom crop sawing behind the feeding direction of the subsequent rolling material. it can.

また、先行圧延材の圧延機圧延時間が所定時間以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、圧延機と鋸断機との距離より小さいと判断することとしたため、後行圧延材の送給方向後方のボトムクロップ鋸断時の先行圧延材との干渉を簡易に回避することができる。   In addition, when the rolling mill rolling time of the preceding rolled material is a predetermined time or less, the length of the preceding rolled material and the length from the leading end of the subsequent rolled material for cutting the crop to the bottom crop sawing position Since the sum is determined to be smaller than the distance between the rolling mill and the sawing machine, it is possible to easily avoid interference with the preceding rolling material at the time of bottom crop sawing behind the feeding direction of the subsequent rolling material. it can.

また、先行圧延材の送給方向先方への圧延時に後行圧延材を圧延機側に送り出して送給方向後方のボトムクロップを鋸断し、次いで先行圧延材の送給方向後方への圧延時に後行圧延材を圧延機側から送り戻して送給方向先方のトップクロップを鋸断することとしたため、トップクロップ鋸断後に先行圧延材が送給方向先方に払い出されるのに合わせて後行圧延材を圧延機に送給することができ、その分だけ、ラインの生産効率を向上することが可能となる。   Also, when rolling the preceding rolled material forward in the feed direction, the subsequent rolled material is sent to the rolling mill and the bottom crop behind the feed direction is sawn, and then the preceding rolled material is rolled backward in the feed direction. Since the subsequent rolled material is fed back from the rolling mill side and the top crop in the feed direction is sawed, the subsequent rolling is performed in accordance with the preceding rolled material being paid out in the feed direction after the top crop. The material can be fed to a rolling mill, and the production efficiency of the line can be improved accordingly.

本発明の圧延材のクロップ鋸断方法を展開したＨ型鋼圧延ラインの一実施形態を示す全体図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows one Embodiment of the H-shaped steel rolling line which developed the crop cutting method of the rolling material of this invention. 後行圧延材のトップクロップから先に鋸断する場合の説明図である。It is explanatory drawing in the case of cutting ahead from the top crop of a subsequent rolling material. 後行圧延材のボトムクロップから先に鋸断する場合の説明図である。It is explanatory drawing in the case of cutting ahead from the bottom crop of a subsequent rolling material. ボトムクロップから先に鋸断するか、トップクロップから先に鋸断するかの判断の説明図である。It is explanatory drawing of judgment of whether it cuts first from a bottom crop, or it cuts first from a top crop.

次に、本発明の圧延材のクロップ鋸断方法の一実施形態について図面を参照しながら説明する。
図１は、本実施形態の圧延材のクロップ鋸断方法が展開されたＨ型鋼の圧延ラインの説明図である。ブルームと呼ばれる圧延素材は、図中右上の加熱炉１１で加熱された後、ブレークダウンミル１２で粗形に圧延され、次いで第１粗圧延機（Ｒ１ミルとも記す）１３で最初の粗圧延が行われる。最初の粗圧延が完了した圧延材は、トングホットソーと呼ばれるクロップ鋸断用熱間鋸断機（ＴＨＳとも記す）１４で、送給方向先方のトップクロップ及び送給方向後方のボトムクロップが鋸断されて、第２粗圧延機（Ｒ２ミルとも記す）１５に送給され、２回目の粗圧延が行われる。２回目の粗圧延が完了した圧延材は、仕上げ圧延機１６で仕上げ圧延が行われ、次いで２つのホットソー、つまり熱間鋸断機１７、１８で所定寸法に鋸断され、クーリングベッドと呼ばれる貯留部１９で常温に冷却された後、ローラー矯正機２０に送給される。ローラー矯正機は、Ｈ型鋼のウエブの上下にローラーが多数配設され、このローラーの間にＨ型鋼を送給して形状を矯正する。 Next, an embodiment of a method for cutting a rolled material according to the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a rolling line for H-section steel in which the rolled material crop sawing method of this embodiment is developed. A rolling material called bloom is heated in a heating furnace 11 at the upper right in the figure, and then rolled into a rough shape by a breakdown mill 12, and then the first rough rolling is performed by a first roughing mill (also referred to as R1 mill) 13. Done. The rolled material that has undergone the first rough rolling is a hot sawing machine for cutting saws (also referred to as THS) 14 called a tong hot saw, and the top crop in the feed direction and the bottom crop in the feed direction are sawed. Is cut and fed to a second rough rolling mill (also referred to as R2 mill) 15 to perform the second rough rolling. The rolled material that has been subjected to the second rough rolling is subjected to finish rolling by a finish rolling mill 16, and then sawed to a predetermined size by two hot saws, that is, hot sawing machines 17 and 18, and stored as a cooling bed. After being cooled to room temperature by the unit 19, it is fed to the roller straightening machine 20. The roller straightening machine has a large number of rollers arranged above and below the H-shaped steel web, and feeds the H-shaped steel between the rollers to correct the shape.

本実施形態の圧延材のクロップ鋸断方法は、前記Ｒ２ミル１５の入側に設けられたＴＨＳ１４に適用される。周知のように、Ｈ型鋼圧延では、１つの圧延機に圧延材を複数回往復送給して圧延を行う。この片道の送給を１パスとカウントする。前記Ｒ２ミル１５−ＴＨＳ１４では、例えば図２に示すように、Ｒ２ミル１５での圧延材のパス回数が全部で５回であり、後行圧延材２がＴＨＳ１４に送給された時点でＲ２ミル１５での先行圧延材１の圧延回数が４パス目である場合には、後行圧延材２の送給方向先方のトップクロップを先にＴＨＳ１４で鋸断し、Ｒ２ミル１５による先行圧延材１の圧延が完了する、即ち５パス目が終了したら、後行圧延材２をＲ２ミル１５側に送り出し、当該後行圧延材２の送給方向後方のボトムクロップをＴＨＳ１４で鋸断する。   The rolled material crop sawing method of the present embodiment is applied to the THS 14 provided on the entry side of the R2 mill 15. As is well known, in H-shaped steel rolling, rolling is performed by reciprocating a rolling material a plurality of times to one rolling mill. This one-way feed is counted as one pass. In the R2 mill 15-THS14, for example, as shown in FIG. 2, the number of passes of the rolled material in the R2 mill 15 is 5 times in total, and when the succeeding rolled material 2 is fed to the THS14, the R2 mill 15 When the number of rolling of the preceding rolled material 1 at 15 is the fourth pass, the top crop in the feed direction ahead of the subsequent rolled material 2 is first sawn by THS 14 and the preceding rolled material 1 by the R2 mill 15 is cut. When the second rolling is completed, that is, the fifth pass is completed, the succeeding rolled material 2 is sent to the R2 mill 15 side, and the bottom crop behind the following rolling material 2 in the feeding direction is sawed by THS14.

一方、例えば図３に示すように、Ｒ２ミル１５での圧延材のパス回数が全部で５回であり、後行圧延材２がＴＨＳ１４に送給された時点でＲ２ミル１５での先行圧延材１の圧延回数が未だ２〜３パス目である場合には、後行圧延材２をＲ２ミル１５側に所定量だけ送り出してボトムクロップを先にＴＨＳ１４で鋸断し、Ｒ２ミル１５で先行圧延材１の４パス目の圧延を行っている間に後行圧延材２をＲ１ミル１３側に所定量だけ送り戻してトップクロップをＴＨＳ１４で鋸断し、Ｒ２ミル１５が先行圧延材１の５パス目の圧延を行っているときに後行圧延材２をＲ２ミル１５側に送り出し、先行圧延材１のＲ２ミル１５からの払い出しと同時に後行圧延材２をＲ２ミル１５に送給する。このようにすれば、前記図２の場合に比して、後行圧延材２のボトムクロップの鋸断時間並びにＲ２ミル１５への送給時間、具体的には圧延材１本あたり、２０秒程度を短縮して、ライン効率を向上することが可能となる。   On the other hand, as shown in FIG. 3, for example, the total number of passes of the rolled material in the R2 mill 15 is 5, and when the succeeding rolled material 2 is fed to the THS 14, the preceding rolled material in the R2 mill 15 When the number of rollings of 1 is still in the second to third passes, the subsequent rolled material 2 is sent to the R2 mill 15 side by a predetermined amount, and the bottom crop is first sawn by THS14 and then pre-rolled by R2 mill 15. While rolling the fourth pass of the material 1, the subsequent rolled material 2 is fed back to the R1 mill 13 side by a predetermined amount and the top crop is sawn by THS14. When the pass rolling is performed, the subsequent rolled material 2 is fed to the R2 mill 15 side, and the subsequent rolled material 2 is fed to the R2 mill 15 at the same time when the preceding rolled material 1 is discharged from the R2 mill 15. In this way, as compared with the case of FIG. 2, the sawing time of the bottom crop of the subsequent rolled material 2 and the feeding time to the R2 mill 15, specifically, 20 seconds per rolled material. It becomes possible to improve the line efficiency by reducing the degree.

このように、後行圧延材２のボトムクロップを先に鋸断することができるかできないかは、先行圧延材１が圧延のパス毎に送給方向に延びることに依存している。即ち、圧延のパス回数が少ないときは先行圧延材１の長さが短く、パス回数が多くなると先行圧延材１の長さも長くなる。例えば、本実施形態の場合、Ｒ２ミル１５による先行圧延材１の圧延回数が３パス目以前である場合には、図４ａに示すように、先行圧延材１の長さと後行圧延材２の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、Ｒ２ミル１５とＴＨＳ１４との距離より小さいから、後行圧延材２をボトムクロップ鋸断位置まで送り出しても、後行圧延材２が先行圧延材１に干渉することがなく、後行圧延材２のボトムクロップを安定して鋸断することができる。   Thus, whether or not the bottom crop of the succeeding rolled material 2 can be sawed first depends on the preceding rolled material 1 extending in the feeding direction for each rolling pass. That is, when the number of rolling passes is small, the length of the preceding rolled material 1 is short, and when the number of passes is increased, the length of the preceding rolled material 1 is also long. For example, in the case of this embodiment, when the number of rolling of the preceding rolled material 1 by the R2 mill 15 is before the third pass, as shown in FIG. 4a, the length of the preceding rolled material 1 and the following rolled material 2 Since the sum of the length from the leading end in the feeding direction to the bottom crop sawing position is smaller than the distance between the R2 mill 15 and THS 14, the succeeding rolled material 2 even if the succeeding rolled material 2 is fed to the bottom crop sawing position. 2 does not interfere with the preceding rolled material 1, and the bottom crop of the subsequent rolled material 2 can be stably cut.

一方、本実施形態の場合、Ｒ２ミル１５による先行圧延材１の圧延回数が４パス目以後である場合には、図４ｂに示すように、先行圧延材１の長さと後行圧延材２の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、Ｒ２ミル１５とＴＨＳ１４との距離より大きくなり、後行圧延材２をボトムクロップ鋸断位置まで送り出すと、後行圧延材２が先行圧延材１に干渉して、後行圧延材２のボトムクロップを安定して鋸断することができない。そこで、このような場合には、図４ｃに示すように、先に後行圧延材２のトップクロップを鋸断し、次いで先行圧延材１の５パス目の圧延を待ってから後行圧延材２を送り出してボトムクロップを鋸断する。なお、Ｒ２ミル１５での圧延パス回数は圧延時間と等価であり、前述した圧延パス回数に変えて先行圧延材のＲ２ミルでの圧延時間（１パス目の圧延開始からの時間）でクロップ鋸断を制御することも可能である。また、後行圧延材のボトムクロップをトップクロップより先に鋸断するための判断基準となる圧延パス回数や圧延時間は、各圧延ラインや圧延材の仕様に応じて適宜設定するものであることはいうまでもない。   On the other hand, in the case of this embodiment, when the number of rolling of the preceding rolled material 1 by the R2 mill 15 is after the fourth pass, as shown in FIG. 4b, the length of the preceding rolled material 1 and the following rolled material 2 When the sum of the length from the leading end in the feed direction to the bottom crop sawing position becomes larger than the distance between the R2 mill 15 and the THS 14 and the succeeding rolled material 2 is fed to the bottom crop sawing position, the succeeding rolled material 2 Interferes with the preceding rolled material 1, and the bottom crop of the succeeding rolled material 2 cannot be stably cut. Therefore, in such a case, as shown in FIG. 4c, the top crop of the subsequent rolled material 2 is first sawn, and then the fifth rolling of the preceding rolled material 1 is waited for before the subsequent rolled material. Send out 2 and saw the bottom crop. The number of rolling passes in the R2 mill 15 is equivalent to the rolling time, and the crop saw is the rolling time in the R2 mill of the preceding rolled material (time from the start of rolling in the first pass) instead of the number of rolling passes described above. It is also possible to control disconnection. In addition, the number of rolling passes and the rolling time, which are the criteria for cutting the bottom crop of the subsequent rolled material before the top crop, should be set appropriately according to the specifications of each rolling line and rolled material. Needless to say.

このように本実施形態の圧延材のクロップ鋸断方法によれば、Ｒ２ミル１５の入側に設けられたＴＨＳ１４で圧延材のクロップを鋸断するにあたり、圧延材の送給方向後方のボトムクロップを、当該圧延材の送給方向先方のトップクロップよりも先に鋸断することにより、先行圧延材１のＲ２ミル１５による圧延が完了し、後行圧延材２をＲ２ミル１５に向けて払い出し可能な状態である場合に、後行圧延材２をＲ２ミル１５に向けて速やかに送給することが可能となり、その分だけ、ラインの生産効率を向上することが可能となる。   As described above, according to the crop sawing method for rolled material according to the present embodiment, when cutting the rolled material crop with the THS 14 provided on the entry side of the R2 mill 15, the bottom crop behind the rolled material in the feeding direction is provided. Is cut before the top crop in the feed direction of the rolled material, the rolling of the preceding rolled material 1 by the R2 mill 15 is completed, and the subsequent rolled material 2 is discharged toward the R2 mill 15 When it is in a possible state, it becomes possible to quickly feed the subsequent rolled material 2 toward the R2 mill 15, and the production efficiency of the line can be improved accordingly.

また、先行圧延材１の長さとクロップを鋸断する後行圧延材２の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、Ｒ２ミル１５とＴＨＳ１４との距離より小さいときに、後行圧延材２の送給方向後方のボトムクロップを、当該後行圧延材２のトップクロップよりも先に鋸断することにより、先行圧延材１に干渉することなく、後行圧延材２の送給方向後方のボトムクロップを鋸断することができる。   Further, when the sum of the length of the preceding rolled material 1 and the length from the leading end of the subsequent rolled material 2 for sawing the crop to the bottom crop sawing position is smaller than the distance between the R2 mill 15 and the THS 14 By cutting the bottom crop behind the subsequent rolled material 2 in the feeding direction before the top crop of the subsequent rolled material 2, the subsequent rolled material 2 is not interfered with the preceding rolled material 1. The bottom crop behind the feed direction can be sawn.

また、先行圧延材１の圧延機パス回数が所定回数以下であるときに、先行圧延材１の長さとクロップを鋸断する後行圧延材２の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、Ｒ２ミル１５とＴＨＳ１４との距離より小さいと判断することにより、後行圧延材２の送給方向後方のボトムクロップ鋸断時の先行圧延材１との干渉を簡易に回避することができる。   Further, when the number of rolling mill passes of the preceding rolled material 1 is equal to or less than a predetermined number, the length of the preceding rolled material 1 and the leading end of the succeeding rolled material 2 that cuts the crop to the bottom crop sawing position are cut off. By judging that the sum of the length is smaller than the distance between the R2 mill 15 and the THS 14, it is possible to easily avoid interference with the preceding rolling material 1 at the time of bottom crop sawing behind the rolling material 2 in the feeding direction. can do.

また、先行圧延材１の圧延機圧延時間が所定時間以下であるときに、先行圧延材１の長さとクロップを鋸断する後行圧延材２の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、Ｒ２ミル１５とＴＨＳ１４との距離より小さいと判断することにより、後行圧延材２の送給方向後方のボトムクロップ鋸断時の先行圧延材１との干渉を簡易に回避することができる。   Further, when the rolling mill rolling time of the preceding rolled material 1 is a predetermined time or less, the length of the preceding rolled material 1 and the leading end of the succeeding rolled material 2 that cuts the crop from the feed direction leading end to the bottom crop sawing position. By judging that the sum of the length is smaller than the distance between the R2 mill 15 and the THS 14, it is possible to easily avoid interference with the preceding rolling material 1 at the time of bottom crop sawing behind the rolling material 2 in the feeding direction. can do.

また、先行圧延材１の送給方向先方への圧延時に後行圧延材２をＲ２ミル１５側に送り出して送給方向後方のボトムクロップを鋸断し、次いで先行圧延材１の送給方向後方への圧延時に後行圧延材２をＲ２ミル１５側から送り戻して送給方向先方のトップクロップを鋸断することにより、トップクロップ鋸断後に先行圧延材１が送給方向先方に払い出されるのに合わせて後行圧延材２をＲ２ミル１５に送給することができ、その分だけ、ラインの生産効率を向上することが可能となる。   Further, when the preceding rolled material 1 is rolled forward in the feed direction, the subsequent rolled material 2 is fed to the R2 mill 15 side, and the bottom crop behind the feed direction is sawn, and then the preceding rolled material 1 is fed back in the feed direction. By rolling back the subsequent rolled material 2 from the R2 mill 15 side during sawing and sawing the top crop ahead of the feed direction, the preceding rolled material 1 is paid out to the feed direction ahead after the top crop. Accordingly, the subsequent rolled material 2 can be fed to the R2 mill 15, and the production efficiency of the line can be improved accordingly.

１は先行圧延材、２は後行圧延材、１４は熱間鋸断機（ＴＨＳ）、１５は第２粗圧延機（Ｒ２ミル）   1 is a preceding rolled material, 2 is a subsequent rolled material, 14 is a hot sawing machine (THS), and 15 is a second rough rolling machine (R2 mill).

Claims (5)

圧延機の入側に設けられた鋸断機で圧延材のクロップを鋸断する圧延材のクロップ鋸断方法であって、圧延材の送給方向後方のボトムクロップを、当該圧延材の送給方向先方のトップクロップよりも先に鋸断することを特徴とする圧延材のクロップ鋸断方法。   A rolling material crop cutting method for cutting a rolled material crop with a saw provided on the entrance side of the rolling mill, wherein a bottom crop at the rear of the rolling material feed direction is fed to the rolled material. A method of cutting a rolled material, wherein the cutting is performed before the top crop in the direction. 先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいときに、後行圧延材の送給方向後方のボトムクロップを、当該後行圧延材の送給方向先方のトップクロップよりも先に鋸断することを特徴とする請求項１に記載の圧延材のクロップ鋸断方法。   When the sum of the length of the preceding rolled material and the length from the leading end of the subsequent rolled material that saws the crop to the bottom crop sawing position is smaller than the distance between the rolling mill and the saw, The bottom crop behind the feeding direction of the row rolling material is sawn before the top crop ahead of the subsequent rolling material in the feeding direction. Method. 先行圧延材の圧延機パス回数が所定回数以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいと判断することを特徴とする請求項２に記載の圧延材のクロップ鋸断方法。   When the number of passes of the rolling mill for the preceding rolled material is equal to or less than the predetermined number, the sum of the length of the preceding rolled material and the length from the leading end of the subsequent rolled material to cut the crop to the bottom crop sawing position is The method of cutting a rolled material according to claim 2, wherein the distance is determined to be smaller than the distance between the rolling mill and the sawing machine. 先行圧延材の圧延機圧延時間が所定時間以下であるときに、先行圧延材の長さとクロップを鋸断する後行圧延材の送給方向先端からボトムクロップ鋸断位置までの長さとの和が、前記圧延機と鋸断機との距離より小さいと判断することを特徴とする請求項２に記載の圧延材のクロップ鋸断方法。   When the rolling mill rolling time of the preceding rolled material is a predetermined time or less, the sum of the length of the preceding rolled material and the length from the leading end of the subsequent rolled material to cut the crop to the bottom crop sawing position is The method of cutting a rolled material according to claim 2, wherein the distance is determined to be smaller than the distance between the rolling mill and the sawing machine. 前記先行圧延材の送給方向先方への圧延時に後行圧延材を圧延機側に送り出して送給方向後方のボトムクロップを鋸断し、次いで先行圧延材の送給方向後方への圧延時に後行圧延材を圧延機側から送り戻して送給方向先方のトップクロップを鋸断することを特徴とする請求項２に記載の圧延材のクロップ鋸断方法。   When rolling the preceding rolled material forward in the feed direction, the subsequent rolled material is sent to the rolling mill side, and the bottom crop behind the feed direction is sawn, and then the subsequent rolled material is rolled backward in the feed direction. 3. The method of cutting a rolled material according to claim 2, wherein the row rolled material is fed back from the rolling mill side and the top crop in the feed direction is sawn.
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