JPH0729125B2 - Cold sizing method for steel pipe and rolling mill therefor - Google Patents

Cold sizing method for steel pipe and rolling mill therefor

Info

Publication number
JPH0729125B2
JPH0729125B2 JP17723687A JP17723687A JPH0729125B2 JP H0729125 B2 JPH0729125 B2 JP H0729125B2 JP 17723687 A JP17723687 A JP 17723687A JP 17723687 A JP17723687 A JP 17723687A JP H0729125 B2 JPH0729125 B2 JP H0729125B2
Authority
JP
Japan
Prior art keywords
rolling
roll
rolling mill
rolls
hole
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
JP17723687A
Other languages
Japanese (ja)
Other versions
JPS6422405A (en
Inventor
和夫 渡辺
斉 松隈
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP17723687A priority Critical patent/JPH0729125B2/en
Publication of JPS6422405A publication Critical patent/JPS6422405A/en
Publication of JPH0729125B2 publication Critical patent/JPH0729125B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
    • B21B13/10—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane
    • B21B13/103—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane for rolling bars, rods or wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/22—Aligning on rolling axis, e.g. of roll calibers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/18—Adjusting or positioning rolls by moving rolls axially

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は継目無鋼管あるいは電縫鋼管等の中空素管を冷
間状態で外径縮小するサイジング方法およびその方法に
用いる圧延機に関する。Description: TECHNICAL FIELD The present invention relates to a sizing method for reducing the outer diameter of a hollow shell such as a seamless steel pipe or an electric resistance welded steel pipe in a cold state, and a rolling mill used for the method.

（従来技術とその問題点） 従来、鋼管の製造は、例えば継目無鋼管の場合、穿孔機
としてマンネスマンピアサー、延伸機として傾斜圧延
機，マンドレルミル等で順次圧延を行ない、最後に、再
加熱した後ストレッチレデューサで仕上げられている。(Prior art and its problems) Conventionally, for example, in the case of a seamless steel pipe, in the case of a seamless steel pipe, a Mannesmann piercer as a punching machine, an inclined rolling machine as a drawing machine, a mandrel mill, and the like are sequentially rolled, and finally reheated. Finished with a stretch reducer.

第３版「鉄鋼便覧」第III巻（２），第1042〜1054頁に
記載されているように、このストレッチレデューサは通
常、２乃至３個のロールで孔形を構成した20数台のスタ
ンドから成る連続圧延機であり、最大７〜８％の外径減
少が行なわれている。As described in the 3rd edition, "Handbook of Steel", Volume III (2), pages 1042 to 1054, this stretch reducer is usually made up of two or three rolls in the form of a hole. It is a continuous rolling mill made up of, and the outer diameter is reduced by up to 7-8%.

しかしながら、このようなミルにおいて、冷間状態で、
中空の鋼管を圧延することは行なわれていない。これは
冷間状態で圧延するには材料の変形抵抗が大きいためミ
ル負荷が増大し設備が大規模になることの他に、中空管
に大きな圧下を加えると座屈が生じ易く、正常な圧延は
困難で、所定の圧下が取れないためである。However, in such a mill, in the cold state,
There is no rolling of hollow steel pipes. This is because when the material is rolled in the cold state, the deformation resistance of the material is large, so the mill load increases and the equipment becomes large-scale. This is because rolling is difficult and a predetermined reduction cannot be obtained.

従って、冷間状態で大きな外径縮小を行う必要のあると
きには、多くのスタンドを並べ、１スタンド当りの圧下
を小さくしても、総合して大きな外径減少を得ることが
必要になる。しかしながらこの方法は設備設置面積の制
約がある場合、あるいは多数のスタンドを要するため
に、設備上経済的な製造法とは言えない。Therefore, when it is necessary to greatly reduce the outer diameter in the cold state, it is necessary to arrange a large number of stands and reduce the rolling reduction per stand to obtain a large reduction in outer diameter. However, this method cannot be said to be an economical manufacturing method in terms of equipment because there is a restriction on the area of equipment installation or a large number of stands are required.

（発明が解決しようとする課題） 本発明は、比較的、小さな径の例えば２インチ以下の鋼
管を冷間状態で、能率的に安価な設備で、出来る限り大
きな外径減少を行うことを目的とする。(Problems to be Solved by the Invention) An object of the present invention is to reduce the outer diameter of a steel pipe having a relatively small diameter, for example, 2 inches or less, in a cold state efficiently and with inexpensive equipment. And

（発明の構成要件） 本発明は、冷間圧延においても、孔型寸法を適切に選択
し、パスを構成する各ロールが、その軸方向への変位量
を調整する機構を有する圧延機を使用すれば、従来の熱
間ストレッチレデューサ以上の大きな外径縮小が可能に
なることを、多くの実験によって見出したことに基礎を
置いている。(Constituent requirements of the invention) In cold rolling, the present invention uses a rolling mill having a mechanism that appropriately selects a groove size and each roll forming a path has a mechanism for adjusting the amount of displacement in the axial direction. It is based on the fact that many experiments have found that a larger outer diameter reduction than the conventional hot stretch reducer becomes possible.

即ち、本発明の要旨とする処は、 （１）圧延方向に垂直な面内でその軸心を共有する３つ
のロールによってパスを構成する管用圧延機を用いる圧
延方法であって、前記圧延機のパスを構成する各々のロ
ールがその軸方向に変位可能な調整機構を有する圧延機
を用い、一つのロール形状が、円弧の一部である３つの
ロールからなる孔型で、その３つのロールから構成され
る孔型中心とロール開口孔型部の間の距離が、その前段
孔型の同じ位置に相当する、３つのロールから構成され
る孔型中心と任意の１つのロールの孔型底の間の距離よ
りも小さい孔型を、全スタンドの内１つ以上用いること
によって冷間で中空の金属管を連続的に圧延することを
特徴とする鋼管の冷間サイジング法。That is, the gist of the present invention is (1) a rolling method that uses a rolling mill for pipes that forms a path by three rolls that share an axis in a plane perpendicular to the rolling direction. Using a rolling mill having an adjusting mechanism in which each of the rolls forming the path is displaceable in the axial direction, one roll shape is a hole type consisting of three rolls that are part of an arc, and the three rolls are The distance between the center of the die and the portion of the opening of the roll corresponds to the same position of the former die, and the center of the die composed of three rolls and the bottom of any one roll. A cold sizing method for steel pipes, characterized in that a hollow metal pipe is continuously rolled in the cold by using one or more of all the stands having a hole shape smaller than the distance between them.

（２）圧延方向に垂直な面内でその軸心を共有する３つ
のロールによってパスを構成する管用圧延機であって、
前記圧延機のパスを構成する各々のロールをその軸方向
に変位せしめかつ、所望の位置に保持するロール位置調
整機構を有せしめてなる鋼管の冷間サイジング圧延機。(2) A rolling mill for pipes, in which a path is constituted by three rolls sharing the axis center in a plane perpendicular to the rolling direction,
A cold-sizing mill for steel pipe, comprising a roll position adjusting mechanism for displacing each roll constituting the path of the rolling mill in the axial direction thereof and for holding the roll at a desired position.

にある。It is in.

以下、本発明の根拠を詳細に説明する。Hereinafter, the basis of the present invention will be described in detail.

一般に、通常考えられる、このような鋼管の圧延方法
は、第２図に示すようないわゆるオーバル〜オーバル系
列あるいはオーバル〜ラウンド系列の孔型を用いる方法
である。しかしながら、この孔型を用いて圧延を行った
ところ、１パスの外径減少量が２〜３％以上になると、
材料は孔型内で座屈し、管の両側部がロールの隙間に溢
れ、いわゆる噛出しが生じ、正常な圧延はできないこと
が判った。Generally, such a method of rolling a steel pipe that is usually considered is a method using a so-called oval-oval series or oval-round series hole type as shown in FIG. However, when rolling is performed using this hole die, if the outer diameter reduction amount of one pass is 2-3% or more,
It was found that the material buckled in the hole die, both sides of the tube overflowed into the gap between the rolls, so-called biting occurred, and normal rolling could not be performed.

次に、第３図に示すような、通常熱間ストレッチレデュ
ーサで用いられている３ロール・オーバル孔型を用いて
圧延を行った。孔型は通常、円弧Rnから成るロールが３
つ組み合されて構成され、孔型ｎの寸法ｌｎは、前パス
の孔型（ｎ−１）の寸法ｌｎ−１よりも大きい。これは
材料が孔型より噛み出すことを避けるためである。この
方法によれば、２ロール法に比べ大きな圧下が取れるこ
とが判ったが、孔型の３つの逃し部（矢印で示す）の形
状が鋭いために、この材料を次の孔型（ｎ＋１）で圧延
すれば、溝底部の形状が滑らかにならず、正常な形状が
得られないことが判った。これが冷間状態でかつ中空の
ため、鋭い形状を修正するほどの大きな力が加わらない
ためである。通常のストレッチレデューサでは、このよ
うな現象が生じないのは、熱間であることと、通常７〜
８％／パスの外径減少率ではそれほどの鋭い逃し形状に
ならないためである。Next, as shown in FIG. 3, rolling was performed using a 3-roll oval hole type that is usually used in hot stretch reducers. Hole type is usually 3 rolls consisting of circular arc Rn
The size n of the hole mold n is larger than the size l n-1 of the hole mold (n-1) of the previous pass. This is to prevent the material from biting out of the hole type. According to this method, it was found that a large reduction can be taken as compared with the two-roll method, but since the shape of the three relief portions (indicated by arrows) of the hole type is sharp, this material is used for the next hole type (n + 1). It was found that the shape of the bottom of the groove was not smooth and the normal shape could not be obtained by rolling with. This is because this is in a cold state and is hollow, so a large force for correcting a sharp shape is not applied. With a normal stretch reducer, it is hot and it is usually 7
This is because an outer diameter reduction rate of 8% / pass does not result in a sharp relief shape.

これを避けるためには、円弧Ｒを相対的に小さくすれ
ば、孔型の逃し形状は鋭くならないが、外径減少率を大
きく取り前述した孔型寸法の条件ｌｎ＞ｌｎ−１を守る
と、円弧Ｒは逆に大きく取らざるを得ない。これは従来
の孔型の考えからでは圧延に使用することはできない。In order to avoid this, if the arc R is made relatively small, the relief shape of the hole type does not become sharp, but the outer diameter reduction rate is made large and the above-mentioned condition of the hole type dimension l n > l n-1 is satisfied. On the contrary, the arc R has to be large on the contrary. This cannot be used for rolling from the conventional hole type concept.

発明者らはこれを解決するため熱間，冷間で多くの実験
を行ない、次の事実を見出した。In order to solve this, the inventors conducted many experiments in hot and cold, and found the following facts.

すなわち、前述したｌｎ＜ｌｎ−１とした孔型では、熱
間圧延では確かに噛出しの原因となるが、冷間圧延で
は、十分なミル剛性を持たせロール隙を最小に保つこと
に注意すれば、若干の噛出しが発生するが、後続パスで
消去できる程度であり、必ずしもこの条件を守る必要が
ないということである。That is, in the above-described hole type with l n <l n-1 , hot rolling surely causes biting, but in cold rolling, sufficient mill rigidity is provided to keep the roll gap to a minimum. Note that although some biting occurs, it can be erased in the subsequent pass, and it is not always necessary to comply with this condition.

一方、このような孔型での圧延は、孔型寸法ｌｎとｍｎ
の比が小さく、従って、材料断面形状も円に近いため、
材料は、圧延中に正規の孔型に対する位置を保持でき
ず、少しの外乱によっても材料が捻れ、倒れて事実上圧
延を遂行できない。On the other hand, the rolling in such a hole type is performed by the hole size dimensions l n and m n.
The ratio of is small and therefore the cross-sectional shape of the material is close to a circle,
The material cannot hold its position with respect to the regular hole shape during rolling, and even if a slight disturbance causes the material to be twisted, the material will fall down and thus the material cannot be effectively rolled.

通常の熱間ストレッチレデューサのスタンドは、孔型を
正確に構成するため、予めオフラインにおいてロールを
ロール箱に組み込んだまま孔型を旋削しているが、前述
の圧延のような場合、かかるスタンドをもってしても捻
れが発生する。In order to form the hole form accurately, the stand of the normal hot stretch reducer turns the hole form with the roll already installed in the roll box in advance, but in the case of rolling mentioned above, such a stand is used. Even if it is twisted.

これを解消するには、ロール位置の構成に誤差があった
とき、これを積極的に修正する機構を有するスタンド構
造とすることが必要となるが、通常の熱間ストレッチレ
デューサのスタンドは、このような構造になっていな
い。In order to eliminate this, it is necessary to have a stand structure with a mechanism that positively corrects the error in the configuration of the roll position, but the stand of a normal hot stretch reducer It is not structured like this.

勿論、このようなスタンドを用いても、真のロール位置
が適正がどうかは知り得ようがないが、これはある基準
状態を基に圧延材料の捻れを検出し、ロール位置をその
軸方向に変化させることによって、材料の捻れを修正で
きるので、それで十分である。Of course, even if such a stand is used, it is impossible to know whether the true roll position is proper, but this is because the twist of the rolled material is detected based on a certain reference state and the roll position is set in the axial direction. It is sufficient because the twist of the material can be corrected by changing it.

これが可能であることは、発明者等が多くの実験で確認
した。The inventors have confirmed in many experiments that this is possible.

即ち、このようなロール横行（軸方向変位）調整可能な
圧延スタンドと、第１図に示すような、（ｎ−１）、ｎ
の２つの孔型において、ｌｎ＜ｌｎ−１となる孔型列を
組合せて、初めて大きな外径縮小率の採れる冷間圧延が
安定して可能となる。That is, such a rolling stand capable of roll traverse (axial displacement) adjustment and (n-1), n as shown in FIG.
In the two hole types described above, it is possible to stably perform the cold rolling in which a large outer diameter reduction rate can be obtained only by combining the hole type rows satisfying l n <l n-1 .

（実施例） 以上の知見によって、第１図に基く６パスの孔型設計を
行ない圧延を行なった。(Example) Based on the above knowledge, a 6-pass hole type design based on FIG. 1 was performed and rolling was performed.

第４図に用いた３ロール圧延機のロール横行調整機構を
示す。３つのロール１の各々の軸受箱２は、ハウジング
３を基点にナット４により調整可能となっている。FIG. 4 shows the roll traverse adjustment mechanism of the 3-roll rolling mill used. The bearing box 2 of each of the three rolls 1 can be adjusted by a nut 4 with the housing 3 as a base point.

素管寸法直径25mm,肉厚2mmより製品径12.5mmが得られ、
外径減少率50％/6パスが可能となった。また、ロール開
口部の形状は滑らかで、何の問題も生じなかった。A product diameter of 12.5 mm can be obtained from the raw pipe size diameter of 25 mm and wall thickness of 2 mm.
Outer diameter reduction rate of 50% / 6 passes is possible. Further, the shape of the roll opening was smooth, and no problem occurred.

（発明の効果） 本発明によって、中空素管を能率的に外径縮小すること
ができ、例えばストレッチレデューサで製造された鋼管
を更に冷間でより小さなサイズに圧延、作り分けること
ができる。(Effects of the Invention) According to the present invention, the outer diameter of a hollow shell can be efficiently reduced, and for example, a steel tube manufactured by a stretch reducer can be cold-rolled to a smaller size and manufactured separately.

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

第１図は本発明による孔型例、第２図は従来線材の圧延
等に用いられている孔型例、第３図は通常の熱間ストレ
ッチレデューサで用いられている孔型例を示す。第４図
は本発明に適用する圧延スタンドのロール横行調整機構
の一例を示す。 １……ロール、２……軸受箱、３……ハウジング、４…
…調整ナット。FIG. 1 shows an example of a hole type according to the present invention, FIG. 2 shows an example of a hole type used for rolling a conventional wire rod, and FIG. 3 shows an example of a hole type used in a normal hot stretch reducer. FIG. 4 shows an example of a roll traverse adjustment mechanism of a rolling stand applied to the present invention. 1 ... Roll, 2 ... Bearing box, 3 ... Housing, 4 ...
… Adjustment nut.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】圧延方向に垂直な面内でその軸心を共有す
る３つのロールによってパスを構成する管用圧延機を用
いる圧延方法であって、前記圧延機のパスを構成する各
々のロールがその軸方向に変位可能な調整機構を有する
圧延機を用い、一つのロール形状が、円弧の一部である
３つのロールからなる孔型で、その３つのロールから構
成される孔型中心とロール開口孔型部の間の距離が、そ
の前段孔型の同じ位置に相当する、３つのロールから構
成される孔型中心と任意の１つのロールの孔型底の間の
距離よりも小さい孔型を、全スタンドの内１つ以上用い
ることによって冷間で中空の金属管を連続的に圧延する
ことを特徴とする鋼管の冷間サイジング法。1. A rolling method using a rolling mill for pipes in which a path is constituted by three rolls sharing an axis center in a plane perpendicular to the rolling direction, wherein each roll constituting the path of the rolling mill is By using a rolling mill having an adjusting mechanism that is displaceable in the axial direction, one roll shape is a hole type consisting of three rolls that are part of a circular arc, and the center and roll of the hole type formed from the three rolls. A hole mold in which the distance between the opening hole mold portions is smaller than the distance between the hole mold center composed of three rolls and the hole mold bottom of any one roll, which corresponds to the same position of the preceding hole mold. The method of cold sizing a steel pipe, wherein a hollow metal pipe is continuously rolled in cold by using one or more of all stands. 【請求項２】圧延方向に垂直な面内でその軸心を共有す
る３つのロールによってパスを構成する管用圧延機であ
って、前記圧延機のパスを構成する各々のロールをその
軸方向に変位せしめかつ、所望の位置に保持するロール
位置調整機構を有せしめてなる鋼管の冷間サイジング圧
延機。2. A rolling mill for pipes, wherein a path is constituted by three rolls sharing an axis center in a plane perpendicular to the rolling direction, wherein each roll constituting the path of the rolling mill is arranged in the axial direction. A cold sizing mill for steel pipes which has a roll position adjusting mechanism for displacing and holding it at a desired position.
JP17723687A 1987-07-17 1987-07-17 Cold sizing method for steel pipe and rolling mill therefor Expired - Lifetime JPH0729125B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17723687A JPH0729125B2 (en) 1987-07-17 1987-07-17 Cold sizing method for steel pipe and rolling mill therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17723687A JPH0729125B2 (en) 1987-07-17 1987-07-17 Cold sizing method for steel pipe and rolling mill therefor

Publications (2)

Publication Number Publication Date
JPS6422405A JPS6422405A (en) 1989-01-25
JPH0729125B2 true JPH0729125B2 (en) 1995-04-05

Family

ID=16027526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17723687A Expired - Lifetime JPH0729125B2 (en) 1987-07-17 1987-07-17 Cold sizing method for steel pipe and rolling mill therefor

Country Status (1)

Country Link
JP (1) JPH0729125B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3914016C1 (en) * 1989-04-25 1990-07-26 Mannesmann Ag, 4000 Duesseldorf, De
JP7180586B2 (en) * 2019-12-23 2022-11-30 Ｊｆｅスチール株式会社 Method for manufacturing seamless steel pipe

Also Published As

Publication number Publication date
JPS6422405A (en) 1989-01-25

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