JPS5910484A - Production device of electric welded pipe - Google Patents

Abstract

PURPOSE:To prevent the generation of any defective part occuring in the stoppage of a mill and to reduce the scrapping of a nondefective material in a production line for an electric welded pipe by interposing a dummy plate in the welding position of a steel strip by allowing for the time when the mill stops. CONSTITUTION:A dummy plate B of the length equal to the length of the crop produced when a mill stops is interposed according to need in the welding position to be connected by a flash butt welder 1 by allowing beforehand for the expected time when the mill stops and the welding position is welded and connected in a production line for an electric welded pipe. The plate B in this state is stopped so as to be located in the electric welding position formed of a work coil 7, a welder 8, etc. in the stage of the stoppage of the mill. The generation of any defective part from a non-defective material occuring in the stoppage of the mill during the pipe making is prevented by the above-mentioned method.

Description

【発明の詳細な説明】 本発明は、電縫鋼管製造時におけるミルストップによる
スクラップ発生を防止するための方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing the generation of scrap due to mill stops during the manufacture of electric resistance welded steel pipes.

一般に電縫鋼管と通称されている電気抵抗溶接ｍ管（以
下、単に「電縫管」と称す。）は、素材の帯鋼を一群の
成形ロールに」：って円筒状に連続成形した後、その継
目部を電気抵抗溶接法（ｌＩＩＲＷ法）を用いて接合し
製造されている。Electric resistance welded pipes (hereinafter simply referred to as "ERW pipes"), which are generally known as ERW steel pipes, are made by continuously forming the raw steel strip into a cylindrical shape using a group of forming rolls. , and are manufactured by joining the joints using an electric resistance welding method (IIRW method).

また、上記電縫管は、従来よりその効率向上を目的とし
てルーパーを用いて連続製管可能にしており、すなわち
連続移送すべく先行コイルの後端に随時後続コイルの先
端をフラッシュバット溶接している間も前記ルーパーに
蓄えられた所要長ざのコイルを１！管して２ルを止めず
に連続製管し得るようにしている。In addition, the above-mentioned ERW pipes have traditionally been able to be manufactured continuously using a looper in order to improve their efficiency. In other words, the tip of the following coil is flash-butted to the rear end of the preceding coil at any time for continuous transfer. While you are there, the coil of the required length stored in the looper is 1! This allows for continuous pipe production without stopping.

しかし、この種従来の方法によっても、管内面のビード
取りに使用されるバイトの取替時や肉厚変更によるンル
幅ｌｌｓ時、或いは昼休み等の工場作業停止時にはミル
をストップさせなければならない。従ってこのミルスト
ップ直前及びミルの再スタート直後で溶接が正常に行な
われない部分が生じると共に前記バイトの取替時などは
ガスカットで管を穿孔して窓部を形成しなければならな
いものであり、これらの範囲は不良として途中行程で切
り捨てられるものであった。However, even with this kind of conventional method, the mill must be stopped when replacing the tool bit used for removing beads on the inner surface of the tube, when changing the wall thickness to change the width of the tube, or when factory operations are stopped such as during lunch breaks. Therefore, there are parts where welding is not performed properly immediately before the mill stops and immediately after the mill restarts, and when replacing the tool, it is necessary to punch a hole in the pipe with a gas cut to form a window. , these ranges were considered defective and were discarded midway through the process.

また、この良材部からの不良部をできるだけ少なくする
ために、前記溶接部でミルをストップざぜるようにする
ことは１ｊＴｔｔ’ｇであり、現在実施されているが、
ミルストップによるオープンロス長ざがかなり長いため
に、切り捨てされる良材部の無駄をＩ１１子消する：１
うでには至らないものであった。In addition, in order to reduce the number of defective parts from this good material part as much as possible, it is recommended to stop the mill at the welded part, and this is currently being carried out.
Because the open loss length due to Mill Stop is quite long, the waste of good wood that is discarded is eliminated by I11: 1
It was beyond my control.

本発明は、上記問題点に鑑みてなされたものであり、電
縫管のＩＡ潰シラインおいて予めミルの停止時期を見込
み、計画的なミルストップ位置に不良材料を位相させる
よう投入せしめて、良材部のスクラップ化を防止しなが
らＩｔ電縫管製造する方法を提供するものである。The present invention has been made in view of the above-mentioned problems, and involves anticipating the mill stop timing in advance at the IA crushing line of the ERW pipe, and injecting defective materials in a phased manner at a planned mill stop position. The present invention provides a method for manufacturing It electric resistance welded pipes while preventing good material parts from being scrapped.

すなわち、本発明の電縫管の製造方法はアンコイラ−か
ら送給され、フラッシュバラトウエルダーで連続移送可
能に溶接してなる帯状鋼板を、ルーハーヲ介してブレー
クダウンロール、フィンバスロールで半円状に成形した
後、スクイズロールで連続製管せしめる方法において予
め製管途中でのミル停止時期を見込んで前記フラツシヱ
バットウエルダーによる接続溶接部位置にミル停止時に
生ずる切捨医長さに等しい長さをもつダミー板を必要に
１ノじ：じて介在させて溶接接続しておき、ミル停止時
には前記ダミー板が電縫溶接位置にあるようにして停止
させることにより、製管中のミル停止に起因する良材部
からの不良部の発生を防止しながら製管することを特徴
とするものであり、以下これを図面に示す一実施例に基
づａ詳細に説明する。That is, in the method of manufacturing an electric resistance welded pipe of the present invention, a strip steel plate is fed from an uncoiler and welded by a flash ball welder so as to be continuously transferable, and is then passed through a luher to a semicircular shape using a breakdown roll and a fin bath roll. In the method of continuously manufacturing pipes using squeeze rolls, a length equal to the truncated length that occurs when the mill stops is placed at the connection weld position by the flat butt welder in anticipation of when the mill will stop during pipe manufacturing. By intervening and welding a dummy plate with one thread as necessary, and stopping the mill with the dummy plate in the electric resistance welding position when the mill is stopped, the mill can be stopped during pipe making. This method is characterized by manufacturing pipes while preventing the occurrence of defective parts from good material parts, and this will be described in detail below based on an embodiment shown in the drawings.

第」図は、本発明の方法を実施するための電縫管の製造
ラインを示す説明図であり、該製造ラインは、アンコイ
ラ−（２）から送給される帯鋼（ム）をレベラー（３）
を介して連続移送可能に溶接するためのフラッシュバラ
トウエルダー（１）ト、該フラッシュバラトウエルダ−
（１）を通過した帯鋼（菊を所定瀘蓄えておくためのル
ーバー（４）と該ルーパ（４）を介して移送される前記
帯１ｉ１（Ａ）のエツジ部を成型すると共に半円状に初
期成型せしめるブレークダウンロール（５）と、該ロー
ル（５）後方で、そのエツジ面の角度フントロールを行
なうと共に仕上成型し、管形成するためのフィンパスμ
ｍル（６）とを備えており、該フィンバスロール（６）
での仕上成型援、ワークコイル（７）で所定温度に加熱
してその両エツジ重合部を溶接接続し連続製管するもの
である。Fig. 1 is an explanatory diagram showing a production line for electric resistance welded pipes for carrying out the method of the present invention, and the production line passes the steel strip (mu) fed from the uncoiler (2) to the leveler (2). 3)
A flash barato welder (1) for welding that can be continuously transferred through the flash barato welder.
(1) (louver (4) for storing chrysanthemums in a predetermined amount and the edge part of the band 1i1 (A) transferred through the looper (4) is shaped into a semicircular shape. A breakdown roll (5) is used for initial forming, and at the rear of the roll (5), an angle foot roll is performed on the edge surface of the roll, and a fin path μ is used for finishing forming and forming a tube.
ml (6), and the fin bath roll (6)
As a final forming aid, the work coil (7) is heated to a predetermined temperature, and the two edge overlapping parts are welded and connected for continuous pipe production.

而して本発明の電縫管の製造方法は、上記製造ラインの
ぞめ予期されるミル停止時、例えば管内面のビードｆｌ
ｙりに使用されるバイト（９）の取替時或藝は、肉厚変
更によるミル幅調整時、又は昼休み等の工場作業停止時
等のミル停止に起因して生しるウェルズ−（８）部での
不良溶接部を除去するようフラッシュバラトウエルダー
（１）部で調整する方法である。Therefore, in the method for manufacturing an electric resistance welded pipe of the present invention, when the mill is expected to stop in the above-mentioned manufacturing line, for example, the bead fl on the inner surface of the pipe is removed.
When replacing the tool bit (9) used for drilling, the wells (8 This is a method of adjusting the flash balat welder (1) to remove the defective weld at the ) section.

すなわち、予め製管途中での前記ミル停止時期を見込ん
で前記７クラツシユバツトウエルダー（１）による接続
溶接部位置にミル停止時に生ずる切捨量長さに等しい長
ざ、例えばワークコイル（７）とウェルズ−（８）間の
長ざをｔ１ワークコイル（７）とバイト（９）間の長さ
をＬとするとα（Ｉ、十ｔ）程度の長ざのダミー板（Ｂ
）を第２図の如く必要に応じて介在させて溶接接続して
第６図に示すような状態にしておき、ミル停止時には、
前記タ宜−板（Ｂ）が第４図の如き゛厩縫溶接位１ｄに
あるように停止ざぜることにより製・ａ中のミル停止に
起因する良材部からの不良部の発生を防止できるように
したものである。That is, in advance, in anticipation of the time when the mill will stop during pipe manufacturing, a length equal to the length of the cut-off amount that occurs when the mill stops, for example, a work coil (7), is placed at the connection weld position by the seven crush butt welders (1). If the length between the work coil (7) and the cutting tool (9) is L, then the dummy plate (B) has a length of about α (I, 10 tons).
) are interposed and welded as necessary as shown in Fig. 2 to create the state shown in Fig. 6, and when the mill is stopped,
By stopping and zapping the guide plate (B) so that it is at the stable welding position 1d as shown in Fig. 4, it is possible to prevent the generation of defective parts from good material parts due to mill stoppage during manufacturing a. This is how it was done.

なお、前記αはミルの仕様および製管速度等によって定
められるが２〜４程度が適当である。Note that α is determined depending on the specifications of the mill, the tube manufacturing speed, etc., and is suitably about 2 to 4.

次に、前方と後続の帯鋼を直接つな贋で行なう従来の製
管法と、約６ｍのダミー板を挿入して行なう本発明の製
管法とでその良材部に発生するオープンロス長さ−につ
いて比較した結果、第５図に示す如〈従来の製管法では
オープンロス長ざが平均約８７４０ｍであったのに対し
、本発明の製管法では第６図に示すように平均約２２８
０ｍｍＫなり、略４分の１に減少した。Next, we will discuss the open loss length that occurs in the good material section between the conventional pipe manufacturing method in which the front and following steel strips are directly connected and fabricated, and the pipe manufacturing method of the present invention in which a dummy plate of about 6 m is inserted. As shown in Figure 5, the average open loss length was approximately 8,740 m in the conventional pipe manufacturing method, while the average open loss length in the pipe manufacturing method of the present invention was approximately 8,740 m, as shown in Figure 6. Approximately 228
It became 0 mmK, which was reduced to about one-fourth.

以上のように、本発明の方法は、元々スクラップである
ダミー板を、帯鋼接続時に一旦利用して再びスクラップ
に戻すようにしたものであるから良材部のスクラップ化
を極少にすることができる経済動電の７＆ｈものである
。As described above, in the method of the present invention, the dummy plate, which is originally scrap, is used once when connecting the steel strips and then returned to scrap again, so it is possible to minimize the scrapping of good material parts. This is the 7&h version of Keizai Denkin.

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

第１図は、ｗ１ｍ管製造ラインを示す説明図、第２図、
；コＩ３図Ｃｔ１本発明のダミー板挿入状況を示す斜規
図、第４図は本発明の方法によるミル１４止時の状態を
示す説明図、第５図は従来の製管法によるオープンロス
長ざを表わすグラフ、第６図は本珀明の製管法によるオ
ーブンロス長ざを表わすグラフ。 （Ａ）は帯鋼、（Ｂ）汀ダは一板。 特許出願人　　住友金属玉業株式会社 第５図 ・ｔｉ覧Ｊ襞しル士＋５’１ オー７１ンロ人長ご（肌ン 第６図 オー７１ンロ７．に−（τすFig. 1 is an explanatory diagram showing the w1m pipe manufacturing line, Fig. 2,
; Figure I3 Ct1 is a diagonal diagram showing the insertion of a dummy plate according to the present invention, Figure 4 is an explanatory diagram showing the state when the mill 14 is stopped according to the method of the present invention, and Figure 5 is an open loss due to the conventional pipe manufacturing method. Figure 6 is a graph showing the oven loss length due to Honkamei's pipe manufacturing method. (A) is a steel band, (B) is a single plate. Patent Applicant: Sumitomo Metal Jewelry Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] エントリを経て連続製管可能に溶接接続された帯鋼を半
円状に成形した後、製管せしめる方法において、予め製
管途中でのミル停止時期を見込んで前記帯鋼接続溶接部
位置にミル停止時に生ずる切捨盪長ざに等しい長さのダ
ミー板を必要に応じて介在させて溶接接続してお趣、ミ
ル停止時には前記ダミー板が電縫溶接位置にあるように
して停止させることにより製管中のミル停止に起因する
良材料からの不良部の発生を防止しながら製管すること
を特徴とする電縫管の製造方法。In the method of forming pipes by welding and connecting them through entry so that continuous pipe production is possible, a steel strip is formed into a semicircular shape, and then a mill is placed at the welded joint position of the strip in anticipation of when the mill will stop in the middle of pipe production. A dummy plate with a length equal to the cutting length that occurs when the mill is stopped is interposed as necessary and welded and connected. When the mill is stopped, the dummy plate is at the electric resistance welding position and the mill is stopped. A method for producing an electric resistance welded pipe, characterized in that the pipe is produced while preventing the generation of defective parts from good materials due to mill stoppage during pipe production.