JPH02311215A - Cutting method for electrically seam welded steel pipe - Google Patents

Abstract

PURPOSE:To cut a product in a require length by computing the cutting length including length change in moulding while taking a pipe length ratio before and after sizing moulding of a steel pipe for a cutting element, and controlling two running cutters independently. CONSTITUTION:A joint weld part 1a is detected on the entrance side of a sizing moulding means 2 for a steel pipe 1 by a flaw detector 3, and a detected position is taken for a reference point to be an input signal to a tracking system 4. Moving distance of two running cutters 6, 7 to the output side is measured by a moving distance measuring means 5 for the steel pipe 1, and measured values of the moving distance are taken for a input signals to the tracking system 4. In the meanwhile, set values of a possible product steel belt length L, an instruction product length L0, and an instruction number N are inputted into a cutting pattern computing means 8, and computation is performed to make a waste length of the welded part 1a to be the shortest. The running cutters 6, 7 are controlled based on computed values and the measured values of the moving distance, thereby the steel pipe 1 is cut in a proper length.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、電縫鋼管の切断方法に関するものである。[Detailed description of the invention] "Industrial application field" The present invention relates to a method for cutting an electric resistance welded steel pipe.

「従来の技術」 従来、溶接鋼管（電縫鋼管）の切断装置として、例えば
特開昭６２−３９７［１６号公報に開示されているもの
がある。"Prior Art" Conventionally, as a cutting device for welded steel pipes (ERW steel pipes), there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 62-397 [16].

それは、連続溶接鋼管製造ラインにて製造される溶接鋼
管の所定の単位長さにおける品質情報を入力する品質情
報入力手段と、この品質情報入力手段により入力された
溶接鋼管の所定の単位長さ、における品質情報を記憶し
前記製造ラインにおける溶接鋼管の移動に応して順次上
記品質情報を自動的にシフトさせる記↑ａ手段と、前記
溶接鋼管の適用条件に応して各種切断長情報を入力する
切断長情報入力手段と、この切断長情報入力手段により
入力された各種切断長情報と前記記憶手段により記す、
ａされた品質情報とに基いて最適な切断長を算出する最
適切断長算出手段と、この最適切断長算出手段により算
出された最適切断長により前記溶接鋼管を自動切断する
自動切断手段とを具備して成るものである。It includes a quality information input means for inputting quality information for a predetermined unit length of a welded steel pipe manufactured on a continuous welded steel pipe manufacturing line, a predetermined unit length of a welded steel pipe input by this quality information input means, ↑a means for storing quality information in and automatically shifting the quality information sequentially according to the movement of the welded steel pipe in the production line, and inputting various cutting length information in accordance with application conditions of the welded steel pipe. a cutting length information input means for inputting the cutting length, and various cutting length information inputted by the cutting length information inputting means, and recording the various cutting length information inputted by the cutting length information input means,
and an automatic cutting means that automatically cuts the welded steel pipe using the optimal cutting length calculated by the optimal cutting length calculating means. It is made up of

［発明が解決しようとする課題」 ところで、前記公開特許公報に記載されている溶接鋼管
の切断装置にあっては、鋼管成形中の長さ変化を、切断
長算出に組み込んでいないこと、および１台の走行切断
機のみを制御していることから、最適切断長油りに鋼管
を切断できない場合が生しる問題があった。[Problems to be Solved by the Invention] By the way, the welded steel pipe cutting device described in the above-mentioned published patent publication does not incorporate the change in length during steel pipe forming into the cutting length calculation, and 1. Since only the traveling cutting machine on the table is controlled, there is a problem that sometimes the steel pipe cannot be cut to the optimum cutting length.

［課題を解決するための手段Ｊ 本発明は、前記従来の問題点を解決すべくなしたもので
あって、その要旨とするところは、先行網化の後端と後
行鋼帯の先端とを中継ぎ溶接し、中継ぎ溶接された鋼帯
を円筒形状の素管に成形し、成形された素管の継ぎ目測
エツジ部を高周波溶接して電縫鋼管を連続的に製造する
ラインにおい′ζ、鋼管のサイジング成形手段の入側に
て前記中継ぎ溶接部を検出し、この中継ぎ溶接部の検出
位置を基準点として、２台の走行切断機の各出側までの
鋼管の移動距離を測定し、一方、１コイル当りの製品可
能鋼帯長さと、製品命令長さと、製品命令本数との設定
値に基づき ａ−αＬ　−（１−ｉ　＋Ｃ）　Ｘｎ　ｉＬ　ｏ　−ｊ
！　＜　Ｌ　ｉ　＜　Ｉ−ｏ　１〆Σｎｉ≦Ｎ で示されるａが最短となるような演算を行い、この演算
値と、前記鋼管の移動距離測定値とに基づき、前記２台
の走行切断機のクランプ、走行、復帰の制御を行って鋼
管を切断することを特徴とする電縫鋼管の切断方法。[Means for Solving the Problems J The present invention has been made to solve the above-mentioned conventional problems, and its gist is that the rear end of the preceding netting and the leading end of the trailing steel strip A line in which ERW steel pipes are continuously manufactured by welding the welded steel strips, forming the welded steel strips into cylindrical blank pipes, and high-frequency welding the seam measuring edges of the formed blank pipes. Detecting the intermediate weld on the input side of the steel pipe sizing forming means, measuring the moving distance of the steel pipe to each outlet of the two traveling cutting machines using the detected position of the intermediate weld as a reference point, On the other hand, based on the set values of the productable steel strip length per coil, product command length, and product command number, a−αL −(1−i +C)
! <L i < I-o 1〆Σni≦N Calculation is performed such that a is the shortest, and based on this calculation value and the measured value of the moving distance of the steel pipe, the distance between the two traveling cutting machines is calculated. A method for cutting an ERW steel pipe, characterized by cutting the steel pipe by controlling clamping, running, and return.

ただし、前記演算式中 ａは中継ぎ溶接部の廃棄長さ αは鋼管のサイジング成形前後の管長比１、は１コイル
当りの製品可能鋼帯長さｌ、ｉは（ｌｌｉｌ々の切断鋼
管長さ Ｃは切断代 ｎｉは採取本数 Ｌ　ｏは製品命令長さ 十〆、−ｐは製品命令長さの公差値 Ｎは製品命令本数 にある。However, in the above calculation formula, a is the waste length of the intermediate weld, α is the pipe length ratio before and after sizing of the steel pipe, which is 1, l is the length of the steel strip that can be produced per coil, and i is the length of the cut steel pipe in (llil). C is the cutting allowance ni is the number of samples to be taken, Lo is the product instruction length, -p is the tolerance value of the product instruction length, and N is the product instruction number.

「作用」 前記の如く、鋼管のサイジング成形前後の管長比を切断
演算要素として用い、成形中の長さ変化分も含めて鋼管
の切断長さの演算を行い、かつ２台の走行切断機を個々
に制御するので、鋼管を製品命令長さ通りに切断するこ
とが可能である。"Operation" As mentioned above, the pipe length ratio before and after sizing of the steel pipe is used as a cutting calculation element, and the cutting length of the steel pipe is calculated including the change in length during forming, and two traveling cutting machines are used. Individual control allows steel pipes to be cut to product-ordered lengths.

「実施例」 次に本発明に係る電縫鋼管の切断方法の実施例を図面に
基づき以下に説明する。“Example” Next, an example of the method for cutting an electric resistance welded steel pipe according to the present invention will be described below based on the drawings.

本発明は、先行鋼帯の後αｊ１．１と後行鋼帯の先α１
１．１とを中継ぎ溶接し、中継ぎ溶接された鋼帯を円筒
形状の素管に成形し、成形された素管の継ぎ目測エツジ
部を高周波溶接して電縫鋼管を連続的に製造するライン
において、第１図に示す如く、鋼管１のサイジング成形
手段２の入側にて、例えば超音波探傷手段３により前記
中継ぎ溶接部１ａを検出し、この中継ぎ溶接部１ａの検
出位置を基準点として１−ラッキングシステム４への入
力信号とし、かつ鋼管１の移動距離測定手段５により、
２台の走行切断機６．７の各出側までの鋼管ｌの移動距
離を測定し、この鋼管１の移動距離測定値を前記トラッ
キングシステム４への入力信号とする。The present invention provides αj1.1 after the leading steel belt and α1 ahead of the trailing steel belt.
1. A line that continuously manufactures ERW steel pipes by welding 1.1, forming the welded steel strip into a cylindrical raw pipe, and high-frequency welding the seam measurement edge of the formed raw pipe. As shown in FIG. 1, at the entry side of the sizing forming means 2 of the steel pipe 1, the intermediate weld 1a is detected by, for example, the ultrasonic flaw detection means 3, and the detected position of the intermediate weld 1a is used as a reference point. 1- as an input signal to the racking system 4 and by means 5 for measuring the distance traveled of the steel pipe 1;
The moving distance of the steel pipe 1 to each outlet of the two traveling cutting machines 6 and 7 is measured, and the measured value of the moving distance of the steel pipe 1 is used as an input signal to the tracking system 4.

−力、１コイル当りの製品可能鋼帯長さＬと、製品命令
長さＬｏと、製品命令本数Ｎとの設定値を、切断パター
ン演算手段８への入力信号として与える。- The set values of the force, the productable steel strip length L per coil, the product command length Lo, and the product command number N are given as input signals to the cutting pattern calculation means 8.

上記切断バクーン演算手段８においてはａ　＝　αＩ−
−（Ｌ　ｉ　十ｃ　）　ｘ　ｎ　ｉＬ　ｏ−１！　＜　
Ｉ−ｉ　＜　Ｉ−ｏ→−ｐΣ勺ｉ≦Ｎ で示される中継ぎ溶接部１ａの廃棄長さａが最短となる
ような演算が行われ、この演算値と、前記トラッキング
システム４からの鋼管１の移動距離測定値とに基づき、
前記２台の走行切断機６．７のクランプ、走行、復帰の
制御を切断機制御システム９により行って、鋼管１を適
正の長さに切断するのである。In the cutting Bakune calculation means 8, a = αI−
-(L i 10c) x n iLo-1! <
A calculation is performed such that the waste length a of the intermediate weld 1a, which is expressed as I-i < I-o→-pΣ勺i≦N, is the shortest, and this calculation value and the steel pipe 1 from the tracking system 4 are used. Based on the measured distance traveled by
The clamping, traveling, and returning of the two traveling cutting machines 6 and 7 are controlled by the cutting machine control system 9, and the steel pipe 1 is cut to an appropriate length.

なお、前記演算式中、αは鋼管のサイジング成形前後の
管長比、Ｌ　ｉは個々の切断鋼管長さ、Ｃは切断代（例
えば３〜５ｍｍ）、ｎｉは採取本数、（−〆、−ｌ−は
製品命令長さの公差値である。In the above calculation formula, α is the pipe length ratio before and after sizing of the steel pipe, Li is the length of each cut steel pipe, C is the cutting allowance (for example, 3 to 5 mm), ni is the number of pieces to be sampled, (-〆, -l - is the tolerance value of the product instruction length.

「発明の効果」 以上述べた如く、本発明によれば、鋼管のサイジング成
形前後の管長比を切断演算要素として用い、成形中の長
さ変化分も含めて鋼管の切断長さの演算を行い、かつ２
台の走行切断機を個々に制御するので、鋼管を製品命令
長さ通りに切断することが可能となり、中継ぎ溶接部の
廃棄率を従来よりも１．７　％減少させることができ、
製品小止りの向上に寄与できる。"Effects of the Invention" As described above, according to the present invention, the pipe length ratio before and after sizing of the steel pipe is used as a cutting calculation element to calculate the cut length of the steel pipe, including the change in length during forming. , and 2
Since the traveling cutting machines on the stand are individually controlled, it is possible to cut the steel pipe to the length specified by the product, and the waste rate of intermediate welds can be reduced by 1.7% compared to the conventional method.
It can contribute to improving the product stoppage.

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

第１図は本発明方法の実施例を示すブロック図である。 １・・・鋼管　　　　　　１ａ・・・中継ぎ溶接部２・
・・サイジング成形手段　３・・・超音波探傷手段４・
・・トラッキングシステム ５・・・鋼管の移動距離測定手段 ６．７・・・走行切断機 ８・・・切断パターン演算手段 ９・・・切断機制御システムFIG. 1 is a block diagram showing an embodiment of the method of the present invention. 1... Steel pipe 1a... Intermediate welded part 2.
...Sizing molding means 3...Ultrasonic flaw detection means 4.
... Tracking system 5 ... Steel pipe movement distance measuring means 6.7 ... Traveling cutting machine 8 ... Cutting pattern calculation means 9 ... Cutting machine control system

Claims (1)

【特許請求の範囲】[Claims] （１）先行鋼帯の後端と後行鋼帯の先端とを中継ぎ溶接
し、中継ぎ溶接された鋼帯を円筒形状の素管に成形し、
成形された素管の継ぎ目両エッジ部を高周波溶接して電
縫鋼管を連続的に製造するラインにおいて、鋼管のサイ
ジング成形手段の入側にて前記中継ぎ溶接部を検出し、
この中継ぎ溶接部の検出位置を基準点として、２台の走
行切断機の各出側までの鋼管の移動距離を測定し、一方
、１コイル当りの製品可能鋼帯長さと、製品命令長さと
、製品命令本数との設定値に基づき ａ＝αＬ−（Ｌｉ＋ｃ）×ｎｉ Ｌ＿ｏ−ｌ＾−＜Ｌｉ＜Ｌ＿ｏ＋ｌ＾＋ Σｎｉ≦Ｎ で示されるａが最短となるような演算を行い、この演算
値と、前記鋼管の移動距離測定値とに基づき、前記２台
の走行切断機のクランプ、走行、復帰の制御を行って鋼
管を切断することを特徴とする電縫鋼管の切断方法。 ただし、前記演算式中 ａは中継ぎ溶接部の廃棄長さ αは鋼管のサイジング成形前後の管長比 Ｌは１コイル当りの製品可能鋼帯長さ Ｌｉは個々の切断鋼管長さ ｃは切断代 ｎｉは採取本数 Ｌ＿ｏは製品命令長さ ＋ｌ＾＋、−ｌ＾−は製品命令長さの公差値Ｎは製品命
令本数(1) The rear end of the leading steel strip and the tip of the trailing steel strip are welded together, and the welded steel strip is formed into a cylindrical pipe.
In a line for continuously manufacturing ERW steel pipes by high-frequency welding both seam edges of formed raw pipes, detecting the intermediate weld on the entry side of a steel pipe sizing forming means,
Using the detection position of this intermediate weld as a reference point, the moving distance of the steel pipe to each exit side of the two traveling cutting machines was measured, and on the other hand, the productable steel strip length per coil and the product command length were determined. Based on the set value with the number of product instructions, a calculation is performed such that a is the shortest as shown by a=αL-(Li+c)×ni L_o-l^-<Li<L_o+l^+ Σni≦N, and this calculation value and , a method for cutting an electric resistance welded steel pipe, characterized in that the steel pipe is cut by controlling clamping, running, and return of the two traveling cutting machines based on the measured value of the moving distance of the steel pipe. However, in the above calculation formula, a is the waste length of the intermediate weld part α is the pipe length ratio L before and after sizing of the steel pipe is the productable steel strip length per one coil Li is the length of each cut steel pipe c is the cutting allowance ni is the number of samples L_o is the product instruction length +l^+, -l^- is the tolerance value of the product instruction length N is the number of product instructions