JPH0438516B2 - - Google Patents

Info

Publication number
JPH0438516B2
JPH0438516B2 JP61093277A JP9327786A JPH0438516B2 JP H0438516 B2 JPH0438516 B2 JP H0438516B2 JP 61093277 A JP61093277 A JP 61093277A JP 9327786 A JP9327786 A JP 9327786A JP H0438516 B2 JPH0438516 B2 JP H0438516B2
Authority
JP
Japan
Prior art keywords
edge
explanatory diagram
electric resistance
wall thickness
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP61093277A
Other languages
Japanese (ja)
Other versions
JPS62252685A (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP9327786A priority Critical patent/JPS62252685A/en
Publication of JPS62252685A publication Critical patent/JPS62252685A/en
Publication of JPH0438516B2 publication Critical patent/JPH0438516B2/ja
Granted legal-status Critical Current

Links

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は電縫管の製造方法に関するものであ
る。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing an electric resistance welded pipe.

[従来の技術] 電縫鋼管の製造に使用される素材は、一般に熱
延コイルをスリツトしたものが使用される。
[Prior Art] The material used to manufacture electric resistance welded steel pipes is generally slit hot rolled coils.

スリツト・コイル1の両エツジ1aは、スリツ
ト時にエツジダレ(第7図)が生じコイル中央部
より厚さが薄くなつていて、又、ブレークダウン
ロール5a,5bによる成形時に、コイルエツジ
1aが圧縮され(第8図)、さらに厚さが薄くな
つている。第9図に熱延コイル、スリツトコイル
及びフインパス前の肉厚分布を示す。
Both edges 1a of the slit coil 1 are thinner than the central part of the coil due to edge sag (Fig. 7) during slitting, and the coil edges 1a are compressed during forming by breakdown rolls 5a and 5b (Fig. 7). (Fig. 8), and the thickness is becoming thinner. Figure 9 shows the wall thickness distribution of the hot-rolled coil, slit coil, and before finpass.

この状態のコイルエツジ部を、突合せ、溶接し
た場合、溶接後のエツジ部の断面は第10図の様
になつている。
When the coil edge portions in this state are butted and welded, the cross section of the edge portion after welding is as shown in FIG. 10.

すなわち、溶接による圧下で内外面にビート1
a,1bがそれぞれ盛り上がるが、ビード1a脇
凹状部1cが薄肉のままで残つてしまう。
In other words, there is a beat 1 on the inner and outer surfaces due to reduction by welding.
Although portions a and 1b are respectively raised, the concave portion 1c on the side of the bead 1a remains thin.

このビード1aは後工程で切削除去されるが、
凹部1cを残さぬ様にBで示す如く切削すると、
内ビード切削跡の寸法不良(ビード切脇肉厚−ビ
ード切削部肉厚が規格値を超える又は肉厚下限の
規格値を超える)となり、逆に、新ビード切削跡
の寸法不良とならない様にAで示す如く切削する
と、凹状の溝1cが残留するという品質上の問題
がある。
This bead 1a will be cut and removed in a later process, but
When cutting as shown by B without leaving the recess 1c,
To prevent dimensional defects of the inner bead cutting marks (bead cutting side wall thickness - bead cutting part wall thickness exceeding the standard value or exceeding the lower limit of wall thickness standard value) and conversely, dimensional defects of the new bead cutting marks. When cutting as shown in A, there is a quality problem in that a concave groove 1c remains.

[発明が解決しようとする問題点] このため、フインパスでの絞りを増加させるこ
とによりエツジ部の増肉を狙うが、エツジ端面と
フインとの接触面の摩擦によりエツジ端面の増肉
量は、エツジ近傍に比べ少なく凹状の溝の防止に
効果が少なく、エツジ近傍の肉厚が規格値外とな
る問題がある。(第11図) [問題点を解決するための手段、作用] 電縫管用素材板の両側端部に成形前にテーパロ
ールにより増肉部を形成しておいて、電縫管を製
造する。
[Problems to be Solved by the Invention] For this reason, the aim is to increase the thickness of the edge portion by increasing the reduction in the fin pass, but the amount of thickness increase on the edge end surface is There is a problem that the thickness near the edges is less effective in preventing concave grooves than near the edges, and the thickness near the edges is outside the standard value. (FIG. 11) [Means and effects for solving the problem] Before forming, thickened portions are formed on both ends of the material plate for an ERW tube using tapered rolls, and an ERW tube is manufactured.

こうして成形前にテーパロールにより両側端部
に増肉部を形成すると共に、フインパスで増肉を
促進させて、内面ビード除去後の寸法不良及び凹
状の溝の発生を防止する。
In this manner, thickened portions are formed at both end portions using tapered rolls before molding, and thickening is promoted using fin passes to prevent dimensional defects and concave grooves from occurring after the inner bead is removed.

[実施例] 本発明方法を実施するためのエツジアプセツト
装置10の1例を第1図〜第3図により説明す
る。エツジアプセツト装置10は、第1図に示す
如く、ブレークダウン5、フインパス6等の成形
機の手前に設けられている。エツジアプセツト装
置10は、第2図に示す如く、フレーム11に1
対のエツジアプセツトロール12,12を対向さ
せて配設して構成され、これらアプセツトロール
12,12の間隔はモータ駆動されるねじ軸13
によつて調整できるようになつている。そしてフ
レーム11は、ベツド14上にローラベアリング
15を介して載置され、ラインの直角方向に移動
できるようになつている。エツジアプセツトロー
ル12は、第3図に示す如く上側に拡径するテー
パ面12aを有するテーパロールとなつている。
[Example] An example of an edge offset apparatus 10 for carrying out the method of the present invention will be explained with reference to FIGS. 1 to 3. As shown in FIG. 1, the edge upset device 10 is provided in front of a molding machine such as a breakdown 5 and a fin pass 6. As shown in FIG.
It is constructed by disposing a pair of edge upset rolls 12, 12 facing each other, and the interval between these upset rolls 12, 12 is determined by a screw shaft 13 driven by a motor.
It can be adjusted by The frame 11 is placed on the bed 14 via roller bearings 15 and is movable in a direction perpendicular to the line. The edge offset roll 12 is a tapered roll having a tapered surface 12a whose diameter increases upward as shown in FIG.

而してスリツトによるエツジダレのある素材1
は、アプセツトロール12により、第3図に示す
如く、両側から圧下され、テーパ面12aに接す
るC部は変形して上側に増肉部Dが形成される。
一方端部下側のF部は大きな変形を受けることな
く、ほぼそのまま残る。
Material 1 with edge sagging due to slits
is rolled down from both sides by the upset roll 12 as shown in FIG. 3, and the portion C in contact with the tapered surface 12a is deformed to form a thickened portion D on the upper side.
On the other hand, the F portion on the lower side of the end remains almost unchanged without undergoing major deformation.

この場合の素材両側の圧下量のアンバランス
は、フレーム11をラインに直角方向に移動でき
るようにしたため、第4図aに示す如く10%以内
になつている。フレーム11を固定した場合の比
較例を第4図bに示す。この場合はコイルのキヤ
ンバ等の蛇行により、エツジ両側の圧下が不均一
になるため圧下量に30%程度のアンバランスが生
じている。
In this case, since the frame 11 can be moved in a direction perpendicular to the line, the unbalance in the reduction amount on both sides of the material is within 10% as shown in FIG. 4a. A comparative example in which the frame 11 is fixed is shown in FIG. 4b. In this case, due to meandering of the coil camber, etc., the reduction on both sides of the edge becomes uneven, resulting in an unbalance of about 30% in the amount of reduction.

そして、端部に増肉部Dが形成された素材板
は、ブレークダウン5で形成され、続いてフイン
パス6で絞られる。この場合、従来のようにエツ
ジ端部がストレートのときは、第5図bに示すよ
うに端面がフインパスロール6aに全面的に接触
するので、接触面の摩擦によりエツジ端面の増肉
は少なかつた。しかし本発明方法の場合は、フイ
ンパスに入つた状態で、第5図aに示すようにエ
ツジのF部のみがフインパスロール6aに接触し
ており、端面の摩擦が少なくフインパス6で絞ら
れる過程でC部の増肉が促進される。フインパス
6出口でのエツジ端部の肉厚分布を第6図aに示
す。第6図bに示す従来の場合に比べ、エツジ端
部での薄肉部は全く無くなつている。
Then, the material plate with the thickened portion D formed at the end portion is formed by a breakdown 5 and then squeezed by a fin pass 6. In this case, when the edge end is straight as in the conventional case, the end face fully contacts the fin pass roll 6a as shown in FIG. Nakatsuta. However, in the case of the method of the present invention, when the edge enters the fin pass, only the F part of the edge contacts the fin pass roll 6a as shown in FIG. This promotes thickening of the C part. The wall thickness distribution of the edge end at the exit of the fin path 6 is shown in FIG. 6a. Compared to the conventional case shown in FIG. 6b, there is no thinner part at the edge end.

こうして、内面ビード脇での凹状部1c(第1
0図)のない電縫管を得ることができる。
In this way, the concave portion 1c (the first
0) can be obtained.

[発明の効果] この発明の電縫管の製造方法は、上記のような
もので、内面ビード除去後の寸法不良及び凹状の
溝の発生を防止することができる。
[Effects of the Invention] The method of manufacturing an electric resistance welded pipe of the present invention as described above can prevent dimensional defects and concave grooves from occurring after the inner bead is removed.

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

第1図〜第3図は、本発明方法を実施するため
の装置の一例を示すもので第1図は配置図、第2
図はエツジアプセツト装置の説明図、第3図はア
プセツトロールを使用状態で示す説明図、第4図
a,bはフレームを移動可能にした場合とフレー
ムを固定した場合のエツジのD側とF側の圧下量
の関係を示す説明図、第5図a,bは本発明法と
従来法におけるエツジ端面とフインパスロールと
の接触状態の説明図、第6図a,bは本発明方法
と従来法におけるエツジ端部の肉厚分布説明図、
第7図はスリツト後のエツジ端部の説明図、第8
図はブレークダウンの説明図、第9図は従来法で
の各工程におけるエツジ端部の肉厚分布説明図、
第10図は従来法での突合せ溶接部の断面形状説
明図、第11図は従来法でフインパスでの絞りを
変えた場合のエツジ端部の肉厚分布説明図であ
る。 1……素材板、1a……端部(エツジ部)、1
2……エツジアプセツトロール、12a……テー
パ面。
Figures 1 to 3 show an example of an apparatus for carrying out the method of the present invention; Figure 1 is a layout diagram;
The figure is an explanatory diagram of the edge upset device, Figure 3 is an explanatory diagram showing the upset roll in use, and Figures 4 a and b are the D side and F side of the edge when the frame is movable and when the frame is fixed. Figures 5a and b are explanatory diagrams showing the relationship between the side rolling reduction amount, and Figures 5a and b are diagrams that illustrate the contact state between the edge end face and the fin pass roll in the method of the present invention and the conventional method. Figures 6a and b are diagrams showing the relationship between the method and the conventional method. An explanatory diagram of the wall thickness distribution at the edge end in the conventional method,
Figure 7 is an explanatory diagram of the edge end after slitting, Figure 8
The figure is an explanatory diagram of breakdown, and Figure 9 is an explanatory diagram of wall thickness distribution at the edge end in each process in the conventional method.
FIG. 10 is an explanatory diagram of the cross-sectional shape of a butt weld in the conventional method, and FIG. 11 is an explanatory diagram of the wall thickness distribution at the edge end when the aperture in the fin pass is changed in the conventional method. 1...Material board, 1a...Edge part, 1
2...Edge upset roll, 12a...Tapered surface.

Claims (1)

【特許請求の範囲】[Claims] 1 電縫管用素材板の両側端部に成形前にテーパ
ロールにより増肉部を形成しておいて、電縫管を
製造することを特徴とする電縫管の製造方法。
1. A method for manufacturing an electric resistance welded tube, which comprises forming thickened portions on both ends of a material plate for electric resistance welded tubes using tapered rolls before forming the electric resistance welded tube.
JP9327786A 1986-04-24 1986-04-24 Manufacture of seam welded pipe Granted JPS62252685A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9327786A JPS62252685A (en) 1986-04-24 1986-04-24 Manufacture of seam welded pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9327786A JPS62252685A (en) 1986-04-24 1986-04-24 Manufacture of seam welded pipe

Publications (2)

Publication Number Publication Date
JPS62252685A JPS62252685A (en) 1987-11-04
JPH0438516B2 true JPH0438516B2 (en) 1992-06-24

Family

ID=14077939

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9327786A Granted JPS62252685A (en) 1986-04-24 1986-04-24 Manufacture of seam welded pipe

Country Status (1)

Country Link
JP (1) JPS62252685A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0238123U (en) * 1988-08-31 1990-03-14
JP2618084B2 (en) * 1990-10-17 1997-06-11 三菱伸銅株式会社 Method and apparatus for manufacturing inner grooved pipe
JP5355182B2 (en) * 2009-03-31 2013-11-27 日新製鋼株式会社 Welded steel pipe manufacturing method and crushing equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55128383A (en) * 1979-03-27 1980-10-04 Sumitomo Metal Ind Ltd Production of electric welded tube
JPS6036348A (en) * 1983-08-05 1985-02-25 Nippon Kogaku Kk <Nikon> Glass for eye glass lenses

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55128383A (en) * 1979-03-27 1980-10-04 Sumitomo Metal Ind Ltd Production of electric welded tube
JPS6036348A (en) * 1983-08-05 1985-02-25 Nippon Kogaku Kk <Nikon> Glass for eye glass lenses

Also Published As

Publication number Publication date
JPS62252685A (en) 1987-11-04

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