JPH03248718A - Bent correcting method for pipe - Google Patents

Abstract

PURPOSE:To attain the high working efficiency and the standardization by applying the tensile strain of the specific range to a pipe and applying the twisting strain below the specific range in combination with the tensile strain, on the time to correct the bent of pipe. CONSTITUTION:The pipe is applied with the tensile strain of >=0.2% and <3.0% and also applied with the twisting strain of 5-180 deg./m in combination. The pipe material 1 is clamped between the fixing side chuck 11 and the twisting side chuck 12, and it is enough only to set the tensile cylinder 13 in addition to the above, of course, the tensile strain and the twisting strain may be applied separately or the twisting strain may be applied while applying the tensile strain. The working efficiency is good and the high yield can be realized because the crop loss is generated only by the gripping amounts of both side ends. Therefore, the effective bent correcting result can be obtained under the condition without the changing of the mechanical property, the working efficiency can be made high and the standardization can be realized because of needless of the skillfulness.

Description

【発明の詳細な説明】 「発明の目的」 本発明は管の曲り矯正方法に係り、鋼管その他の各種管
体についてクロップロスが少く、又直円性を確保して好
ましい曲り矯正をなすことのできる方法を提供しようと
するものである。[Detailed Description of the Invention] ``Object of the Invention'' The present invention relates to a method for straightening the bends of steel pipes and other types of pipes, and is a method for correcting the bends of steel pipes and other types of pipes by ensuring less crop loss and ensuring straightness. This is an attempt to provide a possible method.

（産業上の利用分野） 鋼管などの金属管等についての曲りを矯正する技術。(Industrial application field) Technology for straightening bends in metal pipes such as steel pipes.

（従来の技術） 金属管の曲りを矯正する方法としては種々の手法が提案
されているが、実用的には傾斜ロール式（ロータリー矯
正機）とギャグ式（復動矯正機）が主として採用されて
いる。(Prior art) Various methods have been proposed for straightening the bends in metal pipes, but in practice, the inclined roll type (rotary straightening machine) and the gag type (double-action straightening machine) are mainly used. ing.

即ち傾斜ロール式は第４図に示すように、管材１を傾斜
ロール（２）　（２）、（２）　（２）、（２）　（２
）・・・・・・間通過させて矯するものであり、又ギャ
グ式は第５図に示すように受部体３．３上に支持された
管材ｌに対しそれら受部体３．３の中間部において押圧
部体４による矯正作用を与えるものである。That is, in the inclined roll type, as shown in Fig. 4, the pipe material 1 is rolled by inclined rolls (2) (2), (2) (2), (2) (2).
)......In the gag type, as shown in Fig. 5, the pipe member l supported on the receiving member 3.3 A corrective action is provided by the pressing member 4 at the intermediate portion of the shaft.

なおストレッチ式（引張矯正機）についての提案もなさ
れている。Note that a proposal for a stretch type (tension straightening machine) has also been made.

（発明が解決しようとする課題） 前記した第４図の傾斜ロール式は高能率であって最も多
く採用されているが、管端部のロール間隔に相当する長
さ範囲は原理的に曲り矯正ができない。従って曲り規定
の厳しい材料はどクロップロスを長（する必要があり、
歩留りの低いものとなる不利がある。(Problem to be Solved by the Invention) The inclined roll type shown in Fig. 4 described above is highly efficient and is most commonly used, but in principle, the length range corresponding to the roll interval at the end of the pipe cannot be bent. I can't. Therefore, for materials with strict bending regulations, crop loss must be lengthened (
There is a disadvantage that the yield is low.

又第５図のギャグ式においても原理的に管端部に矯正不
可能な部分が残ることになるが、第４図の傾斜ロール式
の場合よりクロップロスを短縮できるのでその補完とし
採用され得るが、このギャグ式においては曲り矯正が図
れても不同（直円性の喪失）を必要とする材料には適用
し難いことになる。さらにこの方式の場合には定量的な
標準作業条件を決定することができず、作業者の勘に顛
らざるを得ない不利があり、精度的に充分でないことが
多い。ストレッチ式は適切な矯正効果を得るためには鋼
管などの場合において通常約３％以上の引張歪を材料に
与える必要があり、このように大きな引張歪を与えると
管体の機械的性質が変化（劣化）し一般的に採用し難い
。Also, in principle, the gag type shown in Figure 5 leaves a portion at the end of the tube that cannot be corrected, but the crop loss can be reduced compared to the inclined roll type shown in Figure 4, so it can be used as a complement. However, even if this gag method can correct bending, it is difficult to apply to materials that require non-uniformity (loss of right circularity). Furthermore, this method has the disadvantage that it is not possible to quantitatively determine standard working conditions, forcing the operator to rely on his or her intuition, and the accuracy is often insufficient. In order to obtain an appropriate straightening effect with the stretch method, it is usually necessary to apply a tensile strain of approximately 3% or more to the material, such as in the case of steel pipes, and when such a large tensile strain is applied, the mechanical properties of the pipe change. (deterioration) and is generally difficult to adopt.

「発明の構成」 （課題を解決するための手段） 本発明は上記したような従来のものにおける問題点を解
消するように検討を重ねて創案されたものであって、定
量的な矯正条件を決定して標準作業化することができ、
又クロップロスを少くし得ると共に管体の機械的性質を
変化することも少い方法を得ることに成功したものであ
って以下の如くである。"Structure of the Invention" (Means for Solving the Problems) The present invention has been devised after repeated studies to solve the problems of the conventional products as described above, and it has been developed based on quantitative correction conditions. It is possible to decide and standardize the work,
In addition, we have succeeded in obtaining a method that can reduce crop loss and change the mechanical properties of the tube body, as described below.

管体の曲り矯正をなすに当り、管体に対し０．２％以上
３．０％未満の引張歪を与えると共に５゜〜１８０　”
７ｍ以下の捩り歪を複合して附与することを特徴とした
管の曲り矯正方法。When straightening the tube, a tensile strain of 0.2% or more and less than 3.0% is applied to the tube, and the strain is 5° to 180.
A method for straightening a pipe bend, characterized by applying a complex torsional strain of 7 m or less.

（作用） 管体に対し引張歪と捩り歪とを複合して附与することに
よって好ましい曲り矯正結果を得しめる。(Function) By imparting a combination of tensile strain and torsional strain to the tube, a favorable bending correction result can be obtained.

引張歪が０．２％未満では捩り歪を大としても好ましい
曲り矯正効果を得ることができず、一方この引張歪が３
．０％以上となると管材の機械的性質に変化を来し管の
特性が劣化する。If the tensile strain is less than 0.2%, a favorable bending straightening effect cannot be obtained even if the torsional strain is increased;
．． If it exceeds 0%, the mechanical properties of the tube material will change and the characteristics of the tube will deteriorate.

捩り歪が５６／Ｍ未満では少くとも引張歪の上限のある
本発明においてその引張歪との複合によっても充分な曲
り矯正効果を得ることが困難である。一方この捩り量が
増加することにより曲り矯正効果が増加する状態にはあ
るが、一般的に１５゜／Ｍ程度で飽和に近い状態となる
傾向が認められ、特に１８０°／Ｍを超えると管の外表
面にシワ状のような変形を生じ外観上好ましくないこと
となることがあり、１８０°／Ｍ以下とすることにより
斯うした不利を適切に防止する。If the torsional strain is less than 56/M, it is difficult to obtain a sufficient bending straightening effect even when combined with the tensile strain in the present invention, which has an upper limit on the tensile strain. On the other hand, although there is a state in which the bending straightening effect increases as the amount of twist increases, it is generally recognized that it tends to reach a state close to saturation at about 15°/M, and especially when it exceeds 180°/M, the bending straightening effect increases. Wrinkle-like deformation may occur on the outer surface of the material, resulting in an unfavorable appearance. By setting the angle to 180°/M or less, such disadvantages can be appropriately prevented.

（実施例） 上記したような本発明について更に説明すると、本発明
者等は鋼管などにおける曲り矯正について種々に検討を
重ねた結果、引張歪と捩り歪を複合して管体に与えるこ
とにより比較的小さな引張歪であっても効率的な曲り矯
正をなし得ることを確認した。即ちこのような検討につ
いて先ず説明すると、引張歪のみにより曲り矯正効果に
関し試験測定した結果は第３図に示す如くであって、２
龍／Ｍ以下の曲りとするためには３％以上の引張歪量を
与えることが必要であり、これは「鉄網便覧」などにお
いて発表されているところと略同じである。然しこのよ
うに３％以上の大きな引張歪を与えるならば管の機械的
性質（第３図においては代表的に耐力比の変化を併せて
示す）に大きな変化を生じ、その利用上支障を来すこと
が明かであって実際の適用には大きな制限ないし不利を
来すこととならざるを得ない。(Example) To further explain the present invention as described above, as a result of various studies on straightening bends in steel pipes, etc., the present inventors have conducted a comparative study by applying a combination of tensile strain and torsional strain to the pipe body. It was confirmed that efficient bending straightening can be achieved even with a small tensile strain. That is, to explain this kind of study first, the results of test measurements regarding the bending straightening effect using only tensile strain are as shown in Figure 3.
In order to achieve a bend of less than R/M, it is necessary to apply a tensile strain of 3% or more, and this is approximately the same as published in "Iron Net Handbook" and the like. However, if a large tensile strain of 3% or more is applied in this way, a large change will occur in the mechanical properties of the pipe (Figure 3 also shows a typical change in the proof stress ratio), which will impede its use. It is obvious that this method has a negative effect, and this inevitably results in major limitations or disadvantages in actual application.

そこで、このような機械的性質に支障を生ずることのな
い範囲において、しかも好ましい曲り矯正を得ることに
ついて検討し、引張歪と戻り歪を複合して採用すること
について仔細に研究したところ、この捩り歪を複合する
ことにより曲り矯正効果が顕著に助長されることを確認
した。１例として第３図から機械的性質に支障を来さな
いことの明かな１％引張歪を与えた後に各種の捩り歪を
与えた場合の曲り矯正効果を要約して示すと第１図の如
くであって、５°／Ｍ程度で大幅な曲り矯正結果が得ら
れ、従って曲り矯正に必要な引張歪を著しく低減し得る
ことを知った。Therefore, we considered how to obtain a preferable bending correction within a range that does not impede the mechanical properties, and we conducted detailed research on the use of a combination of tensile strain and return strain. It was confirmed that the bending correction effect was significantly enhanced by combining the strains. As an example, Figure 3 summarizes the bending straightening effect when various torsional strains are applied after applying a 1% tensile strain that clearly does not affect mechanical properties. It has been found that a significant bending straightening result can be obtained at about 5°/M, and therefore, the tensile strain necessary for bending straightening can be significantly reduced.

勿論このような手法によるときは所定量の引張歪量と捩
り歪量を与えるだけでよいから標準作業化が頗る容易で
あり、前述した従来のギャグ方式などのような作業者の
熟練を必要としないから作業能率を高め、しかも好まし
い精度が得られる。Of course, when such a method is used, it is extremely easy to standardize the work because it is only necessary to apply a predetermined amount of tensile strain and torsional strain, and unlike the conventional gag method mentioned above, which requires the skill of the operator. This improves work efficiency and provides desirable accuracy.

本発明方法を実施するための設備については代表的に第
２図に示す如くであって、固定側チャック１１と捩り側
チャック１２との間に管材１を装着し、これに引張り用
シリンダー１３を設ける程度でよく、勿論、引張歪と捩
り歪を各別に与えるようにしてよいし、引張歪を与えな
がら捩り歪を与えてもよい。何れにしても作業能率は良
好で、クロップロスは両端のつかみ代だけでよいから歩
留り高〈実施できる。The equipment for carrying out the method of the present invention is typically as shown in FIG. Of course, tensile strain and torsional strain may be applied separately, or torsional strain may be applied while applying tensile strain. In any case, the work efficiency is good, and the crop loss is only the gripping allowance at both ends, so the yield is high.

本発明によるものの具体的な実施例として、熱処理によ
って変態を生しる外径１１４．３酊、肉厚７．１鶴で長
さ８０００１Ｉｍの炭素鋼管と、変態を生じない外径１
６５．２ｍｍ、肉厚７．１　＋ｎ、長さ１００００ｎの
ＳＵＳステンレス網管を用い、本発明方法とその比較法
を実施した結果を要約して示すと次の第１表の如くであ
る。As a specific example of the present invention, a carbon steel pipe with an outer diameter of 114.3 mm, a wall thickness of 7.1 mm, and a length of 80001 mm, which undergoes transformation through heat treatment, and a carbon steel tube with an outer diameter of 1 mm, which does not undergo transformation.
The following Table 1 summarizes the results of implementing the method of the present invention and its comparative method using a SUS stainless steel mesh pipe with a diameter of 65.2 mm, a wall thickness of 7.1 +n, and a length of 10,000 nm.

即ち実施例１〜３．８および１２が比較法で、その他が
本発明によるものであるが、比較法によるものは曲り、
耐力の何れかにおいて好ましいものでないのに対し、本
発明法によるものは何れも良好であり、材質に関係なく
好ましい曲り矯正結果の得られることが確認された。捩
り歪として１０　’／Ｍ以上を採用することにより引張
歪が０、２％という僅少な場合においても的確な矯正結
果を得しめることは明かで、操業的にも頗る有用である
。That is, Examples 1 to 3.8 and 12 are based on the comparative method, and the others are based on the present invention.
It was confirmed that, while the yield strength was not favorable, all of the specimens produced by the method of the present invention were good, and a favorable bending straightening result could be obtained regardless of the material. It is clear that by adopting a torsional strain of 10'/M or more, accurate correction results can be obtained even when the tensile strain is as small as 0.2%, and this is extremely useful from an operational point of view.

「発明の効果」 以上説明したような本発明によるときは比較的平易で、
機械的性質に変化を来すことのない条件下で有効な曲り
矯正結果を得しめることができ、作業者の熟練を必要と
しないため作業能率が高く標準化が可能であり、しかも
クロップロスはせいぜい両管端のつかみ代程度であるか
ら歩留高〈実施できるなどの効果を共に有しており、工
業的にその効果の大きい発明である。"Effects of the Invention" The present invention as explained above is relatively simple;
It is possible to obtain effective bend straightening results under conditions that do not cause changes in mechanical properties, and because it does not require operator skill, work efficiency is high and standardization is possible, and the crop loss is at most Since it is about the size of the gripping margin at both ends of the pipe, it has the effect of increasing the yield and is an industrially highly effective invention.

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

図面は本発明の技術的内容を示すものであって、第１図
は本発明により引張歪１．０％を与え且つ各種捩り量を
与えた結果についての図表、第２図は本発明方法を実施
する設備の概要を示した説明図、第３図は引張歪による
曲り矯正効果と機械的性質（耐力比）の変化を示した図
表、第４図は従来の傾斜ロール式矯正法、第５図は同じ
〈従来のギャグ式矯正法の各概念図を示すものである。 然してこれらの図面において、１は管材、１１は固定側
チャック、１２は捩り側チャック、１３は引張り用シリ
ンダーを示すものである。 第 １ 圓 ０ ５ ０ ５ ＆り量 （ ンメートル） 第 圓 弓 張歪量 （％） 手続補正書 （自発） 平成２年４月２０日The drawings show the technical content of the present invention, and Figure 1 is a chart showing the results of applying a tensile strain of 1.0% and various twist amounts according to the present invention, and Figure 2 is a diagram showing the results of applying the method of the present invention. An explanatory diagram showing an overview of the equipment used, Figure 3 is a chart showing the bending straightening effect due to tensile strain and changes in mechanical properties (yield strength ratio), Figure 4 is a conventional tilted roll type straightening method, Figure 5 The figures show conceptual diagrams of the same conventional gag-type orthodontic method. In these drawings, 1 is a tube, 11 is a stationary chuck, 12 is a torsional chuck, and 13 is a tension cylinder. 1st circle 0 5 0 5 & amount (n meters) 1st circle distortion amount (%) Procedural amendment (voluntary) April 20, 1990

Claims (1)

【特許請求の範囲】[Claims] 管体の曲り矯正をなすに当り、管体に対し０．２％以上
３．０％未満の引張歪を与えると共に５゜〜１８０゜／
ｍ以下の捩り歪を複合して附与することを特徴とした管
の曲り矯正方法。When straightening the bending of the tube, a tensile strain of 0.2% or more and less than 3.0% is applied to the tube and 5° to 180°/
A method for straightening a bent pipe, characterized by applying a complex torsional strain of less than m.