JPH1157816A - Press rolling method for tubes - Google Patents
Press rolling method for tubesInfo
- Publication number
- JPH1157816A JPH1157816A JP21750797A JP21750797A JPH1157816A JP H1157816 A JPH1157816 A JP H1157816A JP 21750797 A JP21750797 A JP 21750797A JP 21750797 A JP21750797 A JP 21750797A JP H1157816 A JPH1157816 A JP H1157816A
- Authority
- JP
- Japan
- Prior art keywords
- caliber
- curvature
- roll
- center
- tube
- 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.)
- Granted
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、管の絞り圧延方
法に関し、特に角張りを抑制できて内面形状に優れる円
管を製造できる管の絞り圧延方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of drawing and rolling a pipe, and more particularly to a method of drawing and rolling a pipe capable of suppressing angularity and producing a circular pipe having an excellent inner surface shape.
【０００２】[0002]
【従来の技術】管圧延によって素管から所望の外径の製
品管を得るために、従来、２ロール式あるいは３ロール
式のスタンド（管圧延スタンド）を複数基タンデムに配
列した絞り圧延設備（例えばストレッチレデューサ）を
用いる絞り圧延方法が採用されている。2. Description of the Related Art Conventionally, in order to obtain a product tube having a desired outer diameter from a raw tube by tube rolling, a conventional two-roll or three-roll type stand (tube rolling stand) is arranged in a plurality of tandem rolling mills ( For example, a draw rolling method using a stretch reducer) is employed.
【０００３】図４は従来の３ロール式絞り圧延方法の説
明図であり（ａ）は外観、（ｂ）はロール配置と六角張
り、（ｃ）はカリバ形状をそれぞれ示す。図４において
１は管、２はロール（カリバロール）で、（ａ）では５
スタンド分を示している。３ロール式絞り圧延方法では
一般に、（ｂ）に示すように隣り合うスタンドのロール
配置に60°の位相差（位相角）をもたせ、管１内面には
工具を配置せず、各ロール２には（ｃ）に示すようにプ
ロフィルを中心Ｏ、半径Ｒの円弧で与えたカリバを設け
る。このプロフィルは、カリバ中心Ｃとパス中心Ｐ間の
距離ａがカリバ端Ｅとパス中心Ｐ間の距離ｂより小さく
かつａ、ｂともＲより小さい（ａ＜ｂ＜Ｒ）、いわゆる
楕円化された形状に設計される。なお、（ｂ−ａ）／ａ
で定義される楕円率が設計パラメータとして使用され
る。FIGS. 4 (a) and 4 (b) are explanatory views of a conventional three-roll reduction rolling method, and FIG. 4 (b) shows a roll arrangement and hexagonal tension, and FIG. 4 (c) shows a caliber shape. In FIG. 4, 1 is a tube, 2 is a roll (calibarol), and in FIG.
Shows the stand. In the three-roll reduction rolling method, generally, as shown in (b), the roll arrangement of the adjacent stands is provided with a phase difference (phase angle) of 60 °, and no tools are arranged on the inner surface of the pipe 1; Is provided with a caliber given by an arc having a center O and a radius R as shown in FIG. This profile is a so-called elliptical shape, in which the distance a between the center K of the caliber and the center P of the path is smaller than the distance b between the center E of the caliber and the center P of the path, and both a and b are smaller than R (a <b <R). Designed in shape. In addition, (ba) / a
Is used as a design parameter.
【０００４】ａ＜ｂより、管はカリバ中心Ｃでは強くカ
リバ端（フランジ側端）Ｅでは弱く圧下され、管内面に
工具が配置されていないため、数パス後には（ｂ）に示
すように、管１内面形状が、スタンド通過毎に30°ピッ
チで回転する六角形を呈するようになる。なお、２ロー
ル式の場合は四角形を呈する。この現象は角張りと呼ば
れ、絞り圧延で製造される製品管内面の形状寸法精度を
悪化させる主要因として、その発生防止対策が古くから
切望されているものである。[0004] From a <b, the pipe is strongly pressed down at the caliber center C at the caliber end (flange side end) E, and no tools are arranged on the inner surface of the pipe, so as shown in FIG. The inner surface of the tube 1 has a hexagonal shape that rotates at a pitch of 30 ° every time the tube passes through the stand. In the case of the two-roll type, the shape is square. This phenomenon is called "squaring", and as a main factor that deteriorates the shape and dimensional accuracy of the inner surface of a product tube manufactured by drawing rolling, measures for preventing the occurrence have long been desired.
【０００５】これまでに提案されている角張り防止対策
の主なものとしては、カリバ真円化、スタンド間張力強
化、およびロール位相角変更（特開昭61−216806号公
報）の３つが挙げられる。[0005] The three main measures to prevent squaring that have been proposed so far are: rounding of Kariba, enhancement of tension between stands, and change of roll phase angle (Japanese Patent Application Laid-Open No. 61-216806). Can be
【０００６】[0006]
【発明が解決しようとする課題】カリバ真円化は、図４
（ｃ）においてａ、ｂをＲに限りなく近づける（楕円率
を限りなく０に近づける）ものであるが、ロールフラン
ジ部での圧下量が相対的に大きくなることから、この部
位での材料の噛み出し傾向が大きくなり、管外面に疵が
発生し易くなる問題がある。The roundness of Kariba is shown in FIG.
In (c), a and b are brought as close as possible to R (to make the ellipticity close to 0 as much as possible). However, since the amount of reduction at the roll flange portion becomes relatively large, the material at this portion is reduced. There is a problem that the tendency to bite out is increased, and flaws are easily generated on the outer surface of the tube.
【０００７】スタンド間張力強化は、各スタンドのロー
ル回転数を調整しスタンド間の張力を増して偏肉を緩和
しようとするものであるが、先後端クロップ（張力がか
からないことによる肉厚非定常部）が長大化し歩留りが
低下する問題がある。ロール位相角変更は、例えば図５
に示すように、 180°／Ｎおよび90°／Ｎ（Ｎ＝２、
３）の位相差をもたせた圧下パターン（図５では基準位
置（時計の文字盤に見立てて12時の位置）に対して０°
⇒60°⇒30°⇒90°、なお、＃ｉ〜＃ｉ＋３はスタンド
番号）で圧延することにより、多角形の角数を増やして
より円形に近い内面形状を得ようとするものであるが、
ロールハウジングを傾斜配置させる等の複雑な機構が必
要となる問題がある。In order to increase the tension between the stands by adjusting the number of rolls of each stand to reduce the uneven thickness, the tension between the stands is increased. Part) becomes longer and the yield is reduced. The change of the roll phase angle is performed, for example, by referring to FIG.
As shown, 180 ° / N and 90 ° / N (N = 2,
The rolling pattern having the phase difference of 3) (0 ° with respect to the reference position (12 o'clock position as a clock face) in FIG. 5)
⇒60 ° ⇒30 ° ⇒90 °, where #i to # i + 3 are stand numbers) to increase the number of corners of the polygon to obtain a more circular inner surface shape. ,
There is a problem that a complicated mechanism such as the inclined arrangement of the roll housing is required.
【０００８】この発明は、上記従来技術の問題に鑑み、
管外面疵やクロップを助長させず複雑な機構も要さずに
管内面の角張りを軽減しうる管の絞り圧延方法を提供す
ることを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide a method of drawing and rolling a pipe capable of reducing the squareness of the inner surface of the pipe without promoting a flaw or a crop on the outer surface of the pipe and without requiring a complicated mechanism.
【０００９】[0009]
【課題を解決するための手段】発明者らは、カリバロー
ルのプロフィルを種々変更して絞り圧延実験を行い、角
張り発生傾向を調査した結果、単一円弧からなるプロフ
ィルをもつ従来のカリバロール（単曲率カリバロール）
のカリバ中心からカリバ端に至る途中部分を、他よりも
小さい曲率をもつ曲線分で置換したプロフィルを有する
カリバロールを、複数基のスタンドの少なくとも１基以
上に配置して絞り圧延することにより、角張りを小さく
できることを知見した。Means for Solving the Problems The inventors of the present invention conducted a reduction rolling experiment by changing the profile of caliberol in various ways, and investigated the tendency of squaring. As a result, a conventional caliberol (single profile) having a profile consisting of a single arc was obtained. Curvature caliberol)
A caliber roll having a profile obtained by replacing the middle part from the center of the caliber to the end of the caliber with a curve having a smaller curvature than the others is arranged on at least one or more of a plurality of stands and drawn and rolled. We found that tension could be reduced.
【００１０】この発明は、上記知見に基づいてなされた
ものであって、その要旨とするところは、カリバロール
を２本以上、好ましくは３本、円周方向に配置してなる
スタンドを複数基タンデムに配列した絞り圧延設備を用
いて素管から所定寸法の製品管を得る管の絞り圧延方法
において、前記スタンドの少なくとも１基以上を、カリ
バ中心からカリバ端に至る途中に曲率が他よりも小さい
小曲率部分が存在しかつ楕円率が 0.5％以上であるプロ
フィルを設けた多曲率カリバロールで構成することを特
徴とする管の絞り圧延方法である。[0010] The present invention has been made based on the above findings, and the gist of the invention is that a plurality of stands, in which two or more, preferably three, caliberol are arranged in the circumferential direction, are provided in a tandem. In a method of reducing the diameter of a tube to obtain a product tube having a predetermined size from a raw tube by using a reduction rolling device arranged in a pipe, at least one of the stands has a curvature smaller than the others on the way from the center of the caliber to the end of the caliber. A method of drawing and rolling a tube, comprising a multi-curvature caliber roll provided with a profile having a small curvature portion and an ellipticity of 0.5% or more.
【００１１】この発明では、各スタンドのロール本数が
Ｎ本のとき、前記小曲率部分が、含プロフィル平面内で
パス中心とカリバ中心を結ぶ直線を基線としてパス中心
回りに測られる 180°／Ｎの1/20〜19/20 、より好まし
くは 180°／Ｎの1/4 〜11/12 、の角度範囲内に存在す
るように、前記多曲率カリバロールのプロフィルを設定
するのが望ましい。According to the present invention, when the number of rolls of each stand is N, the small curvature portion is measured around the path center on the basis of a straight line connecting the path center and the caliber center in the profile-containing plane. It is desirable to set the profile of the multi-curvature calivalol so as to be within an angle range of 1/20 to 19/20, more preferably 1/4 to 11/12 of 180 ° / N.
【００１２】また、この発明では、各スタンドのロール
のカリバとフランジとを境する稜部に丸みをもたせるこ
とが好ましい。また、この発明は、製品管の肉厚と外径
の比（肉厚／外径）が15％以上の場合に適用するのが好
ましい。なお、この発明において、曲率半径および曲率
は、該曲率の中心がプロフィルに関しパス中心と同じ側
にある場合を正、反対側にある場合を負と定義し、曲率
の大小関係は正負の符号も含めて判定する。Further, in the present invention, it is preferable that a ridge portion between the caliber of the roll of each stand and the flange is rounded. Further, the present invention is preferably applied when the ratio of the wall thickness to the outer diameter (wall thickness / outer diameter) of the product tube is 15% or more. In the present invention, the radius of curvature and the curvature are defined as positive when the center of the curvature is on the same side as the path center with respect to the profile, and as negative when the center is on the opposite side with respect to the profile. Judgment is included.
【００１３】また、多曲率カリバロールの楕円率は、従
来の単曲率カリバロールに準じて、含プロフィル平面内
でパス中心からカリバ中心、カリバ端に至る距離をａ、
ｂとするとき、（ｂ−ａ）／ａ×100 （％）、で定義す
る。The ellipticity of the multi-curvature caliberol is based on the distance from the center of the path to the center of the caliber and the end of the caliber in the plane including the profile according to the conventional single-curvature caliberol.
When b, it is defined by (ba) / a × 100 (%).
【００１４】[0014]
【発明の実施の形態】図１は、この発明に係る多曲率カ
リバロールの一例を示す部分正面図である。この例は３
ロール式スタンドに適用されるものである。ここには右
半分のみ示しているが、図示のない左半分は、直線ＯＣ
を含み紙面に垂直な平面に関して右半分と対称である。
同図において、３はカリバ、４はフランジ、５はプロフ
ィル、６は曲率中心Ｏ、半径Ｒの円弧ＣＥの部分円弧
（両端点がＱ1 、Ｑ2 ）、６Ａは部分円弧６と置き代わ
ってプロフィル５の一部をなす、曲率中心Ｏ1 、半径Ｒ
1（＞Ｒ）の小曲率部分である。なお、図４と同一また
は相当部分には同じ符号を付し説明を省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial front view showing an example of a multi-curvature caliberol according to the present invention. This example is 3
This is applied to a roll type stand. Although only the right half is shown here, the left half not shown
And is symmetric with the right half with respect to a plane perpendicular to the paper surface.
In the figure, 3 is a caliber, 4 is a flange, 5 is a profile, 6 is a partial arc of an arc CE having a center of curvature O and a radius R (both ends are Q 1 and Q 2 ), and 6A is a partial arc 6 A center of curvature O 1 , radius R that forms part of profile 5
1 (> R) is a small curvature portion. The same or corresponding parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.
【００１５】また、図２は、この発明に係る多曲率カリ
バロールの他の例を示す部分正面図であり、図１の例同
様３ロール式スタンドに適用され、図１と同一または相
当部分には同じ符号を付し説明を省略する。図２は、小
曲率部分６Ａの曲率中心Ｏ1がプロフィル５に関してパ
ス中心Ｐと反対側にある例を示しており、前記の定義に
よりＲ1 ＜０である。FIG. 2 is a partial front view showing another example of the multi-curvature caliber roll according to the present invention, which is applied to a three-roll stand like the example of FIG. The same reference numerals are given and the description is omitted. Figure 2 shows an example on the opposite side of the path center P with respect to the center of curvature O 1 is profile 5 of small curvature portion 6A, by the definition is R 1 <0.
【００１６】多曲率カリバロールには、図１、図２に示
すように、カリバ中心Ｃからカリバ端Ｅに至る途中に曲
率が他よりも小さい（図１ではＲ1 ＞Ｒ＞０、図２では
Ｒ＞０＞Ｒ1 より、いずれの場合も１／Ｒ1 ＜１／Ｒ）
小曲率部分６が存在するプロフィル５が設けられる。な
お、小曲率部分６Ａの曲率は０であってもよい。このと
きには無論、直線Ｑ1 Ｑ2 が小曲率部分６Ａに該当す
る。As shown in FIGS. 1 and 2, the curvature of the multi-curvature caliber roll is smaller than the others on the way from the caliber center C to the caliber end E (R 1 >R> 0 in FIG. 1; than R>0> R 1, in any case 1 / R 1 <1 / R )
A profile 5 having a small curvature portion 6 is provided. The curvature of the small curvature portion 6A may be zero. At this time, of course, the straight line Q 1 Q 2 corresponds to the small curvature portion 6A.
【００１７】また、図１、図２では、プロフィル５内の
小曲率部分６Ａ以外の部分ＣＱ1 、Ｑ2 Ｅの曲率が共に
１／Ｒである場合を示しているが、これらの部分の曲線
形状は、そこでの曲率が小曲率部分６Ａの曲率１／Ｒ1
より小である限りにおいて、それぞれ独立かつ任意に選
択することができる。例えば当該部分を、複数の円弧を
連結する等により形成される連続曲線で構成してもかま
わない。FIGS. 1 and 2 show the case where the curvatures of the portions CQ 1 and Q 2 E other than the small curvature portion 6A in the profile 5 are both 1 / R. The shape is such that the curvature there is the curvature 1 / R 1 of the small curvature portion 6A.
Each can be independently and arbitrarily selected as long as it is smaller. For example, the portion may be constituted by a continuous curve formed by connecting a plurality of arcs.
【００１８】なお、ロールにこのようなプロフィルを付
与するには、ＮＣ（数値制御）機能を備えた高精度の切
削加工装置を用いるのがよい。絞り圧延設備を構成する
複数基のスタンドのいくつかを、このような多曲率カリ
バロールで構成したスタンド（多曲率カリバロールスタ
ンド）とすることにより、従来の単曲率カリバロールを
配置したスタンド（単曲率カリバロールスタンド）のみ
を用いて絞り圧延する場合に比べて製品管の角張りが軽
減する。In order to impart such a profile to the roll, it is preferable to use a high-precision cutting device having an NC (numerical control) function. By changing some of the plurality of stands constituting the reduction rolling facility to a stand constituted by such a multi-curvature caliber roll (multi-curvature caliber roll stand), a stand (single-curvature caliber roll) in which a conventional single-curvature caliber roll is arranged is used. The squaring of the product tube is reduced as compared with the case of rolling by using only the roll stand).
【００１９】これは、最終的に製品管の内面角張りにつ
ながる圧延パス中の管内面形状の反復再現パターンの規
則性（図４（ｂ）参照）が乱されるためと考えられる。
また、この発明においては、多曲率カリバロールの楕円
率を 0.5％以上としたので、カリバ真円化（楕円率を限
りなく０に近づける）で問題となるカリバ端相当位置の
外面疵多発化傾向はなく、スタンド間張力を特に強化す
る必要がないのでクロップが長大化することはなく、ロ
ール配置のスタンド間位相差は従来通り60°のままでよ
いから複雑なハウジング傾斜機構を設ける必要もない。It is considered that this is because the regularity (see FIG. 4 (b)) of the repetitive reproduction pattern of the inner surface shape of the tube during the rolling pass which eventually leads to the inner surface squareness of the product tube is disturbed.
Further, in the present invention, since the ellipticity of the multi-curvature caliberol is set to 0.5% or more, the tendency of the outer flaw to occur frequently at the position corresponding to the caliber end, which is a problem in rounding the caliber (making the ellipticity as close to 0 as possible), In addition, since there is no need to particularly increase the tension between stands, the crop does not become long, and the phase difference between stands in the roll arrangement can be maintained at 60 ° as in the past, so that there is no need to provide a complicated housing tilting mechanism.
【００２０】ところで、前記小曲率部分６Ａの存在範囲
は、含プロフィル平面（プロフィル５を含む平面）内で
パス中心Ｐとカリバ中心Ｃを結ぶ直線ＰＣを基線として
パス中心Ｐ回りに測られる 180°／Ｎ（ここに、Ｎはス
タンドのロール本数）の 1/20 〜19/20 、より好ましく
は 180°／Ｎの1/4 〜11/12 、の角度範囲内とするのが
望ましい。すなわち、図１、図２に示したθCE（＝∠Ｃ
ＰＥ＝ 180°／Ｎ）を用いて換言すると、小曲率部分６
Ａが内包される好適角度範囲は、1/20θCE〜19/20
θCE、より好ましくは 1/4θCE〜 11/12θCEである。Incidentally, the existence range of the small curvature portion 6A is measured around the path center P with a straight line PC connecting the path center P and the caliber center C as a base line in the profile-containing plane (plane including the profile 5). / N (where N is the number of rolls of the stand) is preferably in the range of 1/20 to 19/20, more preferably 1/4 to 11/12 of 180 ° / N. That is, θ CE (= ∠C shown in FIGS. 1 and 2)
In other words, using PE = 180 ° / N), the small curvature portion 6
A suitable angle range in which A is included is 1 / 20θ CE 1919/20
θ CE , more preferably 1 / 4θ CE to 11 / 12θ CE .
【００２１】この小曲率部分６Ａの存在範囲が 1/4θCE
より小さい角度範囲に及ぶと、角張り抑制効果がやや低
下し、1/20θCEより小さい角度範囲ではそれよりさらに
低下する。また、11/12 θCEより大きい場合にも同様に
角張り抑制効果が低下する。その場合でも従来よりは良
好な内面形状が得られるのであるが、小曲率部分６Ａの
存在する角度範囲を1/20θCE以上、さらには 1/4θCE以
上11/12 θCE以下とすることで、それに応じて製品管の
内面形状が段階的に改善される。The existence range of the small curvature portion 6A is 1 / 4θ CE
When reaching a smaller angular range, Kakubari inhibiting effect is somewhat reduced, still lower than that in 1 / 20θ CE smaller angular range. Also, when it is larger than 11/12 θ CE, the effect of suppressing the cornering similarly decreases. In that case, even the conventionally although the good inner surface shape is obtained, the angular range 1 / 20θ CE or in the presence of small curvature portion 6A, more With less 1/4? CE least 11/12 theta CE Accordingly, the inner shape of the product tube is gradually improved.
【００２２】一方、小曲率部分６Ａの存在範囲が 19/20
θCEより大きい角度範囲に及ぶと、カリバ真円化の場合
と同様、フランジ４の近傍での圧下量が相対的に増加し
てフランジ４側からの噛み出しによる外面疵が生じやす
くなるので、小曲率部分６Ａの存在する角度範囲は 19/
20θCE以下とするのが好ましい。また、このようなフラ
ンジ４側での噛み出しを緩和する観点から、図１、図２
に該当部分を拡大して示すように、ロール２のカリバ３
とフランジ４とを境する稜部に丸みをもたせることが好
ましい。なお、この措置は、多曲率カリバロールスタン
ドのみならず、同じ絞り圧延設備内に配列された従来の
単曲率カリバロールスタンドについても同様に行うのが
よい。On the other hand, the existence range of the small curvature portion 6A is 19/20.
When the angle range is larger than θ CE, as in the case of roundness of Kariba, the amount of reduction in the vicinity of the flange 4 relatively increases, and external flaws due to biting from the flange 4 side are likely to occur. The angle range where the small curvature portion 6A exists is 19 /
Preferably not more than 20θ CE. 1 and 2 from the viewpoint of alleviating the biting on the flange 4 side.
As shown in the enlarged section,
It is preferable to make the ridge portion bordering the flange 4 round. This measure is preferably performed not only for the multi-curvature caliber roll stand but also for the conventional single-curvature caliber roll stand arranged in the same reduction rolling equipment.
【００２３】また、従来、製品管の肉厚（ｔ）と外径
（Ｄ）の比（ｔ／Ｄ）が15％以上の場合に角張りの程度
が比較的大きいので、この発明はこの場合に適用するの
がより効果的である。なお、ここでは、角張りのうちで
も最も問題視される六角張りを生じるストレッチレデュ
ーサ圧延を典型とする３ロール式絞り圧延を対象とし
て、この発明の実施の形態を説明したが、この発明は、
絞り圧延スタンドのロール本数に限定されず、サイザ圧
延に代表される２ロール式絞り圧延や４本以上のロール
スタンドによる絞り圧延にも適用できる。Conventionally, when the ratio (t / D) of the wall thickness (t) to the outer diameter (D) of the product pipe is 15% or more, the degree of squaring is relatively large. Is more effective to apply. Here, although the embodiment of the present invention has been described with respect to a three-roll reduction rolling typified by a stretch reducer rolling that generates hexagonal tension, which is regarded as the most problematic among the square tensions,
The present invention is not limited to the number of rolls of the reduction rolling stand, but may be applied to two-roll reduction rolling represented by sizer rolling or reduction rolling using four or more roll stands.
【００２４】[0024]
【実施例】24基のスタンドからなるストレッチレデュー
サ（３ロール式）を用い、外径110mm ×肉厚17mmの素管
を圧延温度 850℃で絞り圧延し、外径42.7mm×肉厚15mm
の製品管とする絞り圧延工程にこの発明を実施し、製品
管の角張り（この場合、六角張り）の程度を従来と比較
した。角張りの程度は、図３のように定義した角張り率
により評価した。[Example] Using a stretch reducer (3 roll type) consisting of 24 stands, a raw tube with an outer diameter of 110 mm and a wall thickness of 17 mm was drawn and rolled at a rolling temperature of 850 ° C, and an outer diameter of 42.7 mm and a wall thickness of 15 mm
The present invention was carried out in the reduction rolling step for producing a product pipe of the above, and the degree of angular tension (in this case, hexagonal tension) of the product pipe was compared with the conventional one. The degree of squareness was evaluated by the squareness defined as shown in FIG.
【００２５】従来例では、表１に条件Ｅとして示すよう
に、各スタンドのロールを単曲率カリバロールとし、ス
タンド毎に表１に示す楕円率と外径圧下率を設定して絞
り圧延を行った。実施例では、いくつかのスタンドのロ
ールを、表１に条件Ａ〜Ｄとして示す４通りの仕方で多
曲率カリバロールに置換した以外は、従来例と同じ条件
で絞り圧延を行った。なお、置換対象スタンドでは楕円
率（＝（ｂ−ａ）／ａ×100 （％））の因子ａおよび
ｂ、すなわちパス中心〜カリバ中心間距離およびパス中
心〜カリバ端間距離、についても実施例と従来例とで値
を揃えた。In the conventional example, as shown as condition E in Table 1, the roll of each stand was a single curvature caliber roll, and the drawing roll was performed by setting the ellipticity and the outer diameter reduction rate shown in Table 1 for each stand. . In the examples, rolling was performed under the same conditions as in the conventional example, except that the rolls of some stands were replaced with multi-curvature caliber rolls in four ways shown as conditions A to D in Table 1. In the replacement target stand, the examples of the factors a and b of the ellipticity (= (ba) / a × 100 (%)), that is, the distance between the center of the path and the center of the caliber and the distance between the center of the path and the end of the caliber are also described. And the conventional example.
【００２６】[0026]
【表１】 [Table 1]
【００２７】多曲率カリバロールには、複数の円弧をつ
ないで形成し小曲率部分の曲率を正、負とした２種類の
プロフィルＰＦ１、ＰＦ２を設定し、これらプロフィル
をそれぞれ独立に条件Ａ〜Ｄに適用した。ＰＦ１、ＰＦ
２の要素としての各円弧の位置と曲率を表２に示す。位
置はカリバ中心を０°、カリバ端を60°とするパス中心
回りの角度で表し、曲率はカリバ平均曲率（＝２／（ａ
＋ｂ））に対する相対値で表した。In the multi-curvature caliber roll, two types of profiles PF1 and PF2 which are formed by connecting a plurality of circular arcs and have a small curvature portion with positive and negative curvatures are set, and these profiles are independently set under the conditions A to D. Applied. PF1, PF
Table 2 shows the positions and the curvatures of the respective arcs as the two elements. The position is represented by an angle around the center of the path where the center of the Kariba is 0 ° and the end of the Kariba is 60 °, and the curvature is the average curvature of the Kariba (= 2 / (a
+ B)).
【００２８】[0028]
【表２】 [Table 2]
【００２９】実施例、従来例の角張り率を表３に示す。
同表のとおり、実施例では、従来例に比べて角張りが軽
減された。なお、管外面疵とクロップ長については、実
施例と従来例とで差が認められなかった。Table 3 shows the degree of squareness of the embodiment and the conventional example.
As shown in the table, in the example, the angularity was reduced as compared with the conventional example. In addition, no difference was observed between the embodiment and the conventional example regarding the tube outer surface flaw and the crop length.
【００３０】[0030]
【表３】 [Table 3]
【００３１】[0031]
【発明の効果】この発明によれば、管の絞り圧延方法に
おいて、管外面疵やクロップを助長させず複雑な機構も
要さずに管内面の角張りを軽減できるようになるという
優れた効果を奏する。According to the present invention, in the method of drawing and rolling a pipe, an excellent effect that the angularity of the inner surface of the pipe can be reduced without promoting a flaw or a crop on the outer surface of the pipe and without requiring a complicated mechanism. To play.
【図面の簡単な説明】[Brief description of the drawings]
【図１】この発明に係る多曲率カリバロールの一例を示
す部分正面図である。FIG. 1 is a partial front view showing an example of a multi-curvature caliberol according to the present invention.
【図２】この発明に係る多曲率カリバロールの他の例を
示す部分正面図である。FIG. 2 is a partial front view showing another example of the multi-curvature caliberol according to the present invention.
【図３】角張り率の定義の説明図である。FIG. 3 is an explanatory diagram of a definition of a cornering ratio.
【図４】従来の３ロール式絞り圧延方法の説明図であり
（ａ）は要部外観、（ｂ）はロール配置と六角張り、
（ｃ）はカリバ形状をそれぞれ示す。4A and 4B are explanatory diagrams of a conventional three-roll reduction rolling method, wherein FIG. 4A is an external view of a main part, FIG.
(C) shows the Kariba shape.
【図５】従来のロール位相角変更パターン例の説明図で
ある。FIG. 5 is an explanatory diagram of a conventional roll phase angle changing pattern example.
１ 管 ２ ロール（カリバロール） ３ カリバ ４ フランジ ５ プロフィル ６ 円弧ＣＥの部分円弧 ６Ａ 小曲率部分 DESCRIPTION OF SYMBOLS 1 Pipe 2 Roll (Karibarol) 3 Kariba 4 Flange 5 Profile 6 Part of circular arc CE Part 6A Small curvature part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 依藤 章 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 佐藤 秀雄 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 金山 太郎 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Ito 1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawata Steel Corporation Chita Works (72) Inventor Hideo Sato 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki (72) Inventor Taro Kanayama 1-1-1 Kawasaki-cho, Handa-shi, Aichi Prefecture Kawata Steel Corporation Chita Works
Claims (5)
してなるスタンドを複数基タンデムに配列した絞り圧延
設備を用いて素管から所定寸法の製品管を得る管の絞り
圧延方法において、前記スタンドの少なくとも１基以上
を、カリバ中心からカリバ端に至る途中に曲率が他より
も小さい小曲率部分が存在しかつ楕円率が 0.5％以上で
あるプロフィルを設けた多曲率カリバロールで構成する
ことを特徴とする管の絞り圧延方法。1. A method according to claim 1, wherein a plurality of stands each including at least two caliber rolls are arranged in a circumferential direction. At least one or more of the stands shall be composed of a multi-curvature caliber roll provided with a profile having a small curvature portion having a smaller curvature than the others and having an elliptic curvature of 0.5% or more on the way from the center of the caliber to the edge of the caliber. Characteristic tube drawing and rolling method.
求項１記載の方法。2. The method according to claim 1, wherein each stand has three rolls.
前記小曲率部分が、含プロフィル平面内でパス中心とカ
リバ中心を結ぶ直線を基線としてパス中心回りに測られ
る 180°／Ｎの1/20〜19/20 の角度範囲内に存在するよ
うに、前記多曲率カリバロールのプロフィルを設定する
請求項１または２に記載の方法。3. When the number of rolls of each stand is N,
The small curvature portion exists in an angle range of 1/20 to 19/20 of 180 ° / N measured around the center of the path with the straight line connecting the center of the path and the center of the caliber as a base line in the plane including the profile, The method according to claim 1 or 2, wherein a profile of the multi-curvature calivalol is set.
2 である請求項３記載の方法。4. The angle range is 1/4 to 11/1 of 180 ° / N.
4. The method of claim 3, wherein
とを境する稜部に丸みをもたせる請求項１〜４のいずれ
かに記載の方法。5. The method according to claim 1, wherein a ridge bordering the caliber and the flange of the roll of each stand is rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21750797A JP4122542B2 (en) | 1997-08-12 | 1997-08-12 | Pipe drawing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21750797A JP4122542B2 (en) | 1997-08-12 | 1997-08-12 | Pipe drawing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1157816A true JPH1157816A (en) | 1999-03-02 |
| JP4122542B2 JP4122542B2 (en) | 2008-07-23 |
Family
ID=16705326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21750797A Expired - Fee Related JP4122542B2 (en) | 1997-08-12 | 1997-08-12 | Pipe drawing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4122542B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5003833B1 (en) * | 2011-03-31 | 2012-08-15 | 住友金属工業株式会社 | Method for producing drawing roll and drawing roll |
| JP2014039939A (en) * | 2012-08-21 | 2014-03-06 | Nippon Steel & Sumitomo Metal | Reducing mill and roll for reducing mill |
-
1997
- 1997-08-12 JP JP21750797A patent/JP4122542B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5003833B1 (en) * | 2011-03-31 | 2012-08-15 | 住友金属工業株式会社 | Method for producing drawing roll and drawing roll |
| WO2012133484A1 (en) | 2011-03-31 | 2012-10-04 | 住友金属工業株式会社 | Method for manufacturing roll for reducing, and roll for reducing |
| CN103459056A (en) * | 2011-03-31 | 2013-12-18 | 新日铁住金株式会社 | Method for manufacturing roll for reducing, and roll for reducing |
| JP2014039939A (en) * | 2012-08-21 | 2014-03-06 | Nippon Steel & Sumitomo Metal | Reducing mill and roll for reducing mill |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4122542B2 (en) | 2008-07-23 |
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