JPH0550115A - Mandrel mill - Google Patents
Mandrel millInfo
- Publication number
- JPH0550115A JPH0550115A JP3233835A JP23383591A JPH0550115A JP H0550115 A JPH0550115 A JP H0550115A JP 3233835 A JP3233835 A JP 3233835A JP 23383591 A JP23383591 A JP 23383591A JP H0550115 A JPH0550115 A JP H0550115A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- stand
- groove bottom
- hole
- mandrel mill
- 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
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
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はマンドレルミルに関す
る。FIELD OF THE INVENTION The present invention relates to a mandrel mill.
【0002】[0002]
【従来の技術】継目無鋼管の圧延方法として、上下一対
の圧延ロールからなる5〜 8基の穴形ロールスタンドを
連続配置すると共に、隣接する穴形ロールスタンドのロ
ール軸を圧延軸に垂直な面内で相互にずらして交差配置
してなるマンドレルミルにより、マンドレルバーが挿入
された素管を圧延するものがある。2. Description of the Related Art As a method of rolling a seamless steel pipe, five to eight hole-shaped roll stands consisting of a pair of upper and lower rolling rolls are continuously arranged, and the roll axes of adjacent hole-shaped roll stands are perpendicular to the rolling axis. 2. Description of the Related Art There is a method in which a mandrel mill in which a mandrel bar is inserted is rolled by a mandrel mill which is displaced in a plane and crossed with each other.
【0003】このマンドレルミルにおいて、圧延中に管
材に穴が明くことがある。これを「穴明き欠陥」と呼
ぶ。「穴明き欠陥」は重大な品質上の欠陥である。同一
の鋼種、同一の管材外径であれば圧延する管材の仕上げ
肉厚が薄ければ薄いほど「穴明き欠陥」は発生し易い。
管材の仕上げ寸法が同一であれば、普通鋼に比較して変
形能の劣る高合金鋼において「穴明き欠陥」は発生し易
い。[0003] In this mandrel mill, the pipe material may have holes during rolling. This is called a "drilling defect". "Perforated defects" are serious quality defects. If the same steel type and the same outer diameter of the pipe material are used, the thinner the finished wall thickness of the rolled pipe material is, the more likely the "perforated defect" is to occur.
If the finish size of the pipe material is the same, "perforated defects" are likely to occur in the high alloy steel, which is inferior in deformability to the ordinary steel.
【0004】そこで従来、「穴明き欠陥」を防止するた
めに、各種方法が提案されている。一般的な方法とし
て、特開昭58-224155 号公報に見られるように、圧延さ
れる管材材質の熱間変形能を改善する方法がある。Therefore, various methods have heretofore been proposed in order to prevent "drilling defects". As a general method, there is a method of improving the hot deformability of the rolled pipe material, as disclosed in Japanese Patent Laid-Open No. 58-224155.
【0005】その他の方法としては、特開昭63-84720号
公報に見られるように、マンドレルミルで「穴明き欠
陥」の発生するスタンドの圧下率を軽減して、その負荷
を他の各スタンドに分散したり、入側素管の肉厚を減じ
てマンドレルミル各スタンドにおける圧下率を軽減した
りする方法が考案されている。As another method, as shown in Japanese Patent Laid-Open No. 63-84720, the mandrel mill is used to reduce the rolling reduction of the stand where "perforated defects" occur and to reduce the load on each of the others. Methods have been devised to disperse in the stand or reduce the wall thickness of the inlet tube to reduce the rolling reduction in each stand of the mandrel mill.
【0006】[0006]
【発明が解決しようとする課題】(1) 特開昭58-224155
号公報に示された方法だけでは、マンドレルミル圧延中
の温度である 950度〜1050度において十分な熱間変形能
を得ることができず、「穴明き欠陥」が生じることがあ
り、下記特開昭63-84720号公報に提案された方法が考案
された。[Problems to be Solved by the Invention] (1) JP-A-58-224155
Only by the method disclosed in the publication, it is not possible to obtain sufficient hot deformability at a temperature during the mandrel mill rolling of 950 ° C to 1050 ° C, which may cause a "drilling defect". The method proposed in Japanese Patent Laid-Open No. 63-84720 was devised.
【0007】(2) 特開昭63-84720号公報に提案された方
法では、「穴明き欠陥」を防止できるが、次のような問
題がある。即ち、圧下負荷を各スタンドに分散しても圧
延荷重が基準値を越えるスタンドが存在する場合には、
マンドレルミル全体での圧下率を軽減するため入側素管
の肉厚を減じる。ところが、素管を製造する穿孔機にも
圧下率に限界があり、素管肉厚を下限値以下にはできな
い。従って、肉厚の薄い管材が圧延できない場合が生じ
る。(2) The method proposed in Japanese Patent Application Laid-Open No. 63-84720 can prevent "drilling defects", but has the following problems. That is, if there is a stand where the rolling load exceeds the reference value even if the reduction load is distributed to each stand,
The wall thickness of the inlet tube is reduced to reduce the rolling reduction of the entire mandrel mill. However, there is a limit to the reduction rate of the punching machine for manufacturing the raw pipe, and the wall thickness of the raw pipe cannot be made smaller than the lower limit value. Therefore, there is a case where a thin pipe material cannot be rolled.
【0008】本発明は、マンドレルミルにおける前記問
題点を解決し、「穴明き欠陥」を防止することを目的と
する。An object of the present invention is to solve the above problems in the mandrel mill and prevent "drilling defects".
【0009】[0009]
【課題を解決するための手段】本発明はマンドレルミル
の連続配置されたスタンド列のロール穴型を適切に設計
することにより、マンドレルミル圧延で発生する「穴明
き欠陥」を防止するものである。The present invention is intended to prevent the "drilling defect" occurring in the mandrel mill rolling by appropriately designing the roll hole die of the stand row in which the mandrel mill is continuously arranged. is there.
【0010】マンドレルミル圧延における「穴明き欠
陥」の発生原因を調査した結果、従来知られていなかっ
た新しい穴明きのメカニズムを発見し本発明に至った。As a result of investigating the cause of the occurrence of the "drilling defect" in the mandrel mill rolling, a novel mechanism of the drilling which has not been known hitherto has been discovered and the present invention has been accomplished.
【0011】従来より、マンドレルミル圧延における
「穴明き欠陥」の発生原因は、圧延中圧下を受けないフ
ランジ部において材料が長手方向に引っ張られる際、変
形能不足により破断するためと考えられている。It has been considered that the cause of the "perforation defect" in the mandrel mill rolling is that the material is fractured due to insufficient deformability when the material is pulled in the longitudinal direction in the flange portion which is not subjected to rolling reduction. There is.
【0012】しかし本発明者らはこれとは別の新しい穴
明きのメカニズムを発見した。ロール溝底の圧下部分に
おいて、圧下率が溝底中央よりもその両側の方が大きい
場合、圧下部分が長手方向に延ばされる過程で溝底中央
部分の材料が不足して、ネッキング現象を生じて肉厚が
薄くなり極端な場合には穴が明くという現象である。However, the present inventors have discovered a new mechanism of perforation, which is different from this. When the rolling reduction is larger on both sides of the roll groove bottom than in the groove bottom center, the material in the groove bottom center part becomes insufficient during the process of rolling the rolling part in the longitudinal direction, causing a necking phenomenon. This is a phenomenon in which the wall thickness becomes thin and holes are opened in extreme cases.
【0013】図2に圧下率が中央よりもその両側で大き
くなる具体例を示す。例えば第1スタンドのロール穴形
は普通楕円形なので、第1スタンド出側の管材の円周方
向肉厚はロール溝底中央部分が一番薄くそこから離れる
に従って厚くなる。第1スタンドのロール溝底で圧延さ
れたこの部分は第2スタンドの圧延においては圧下を受
けないので肉厚分布は第2スタンド通過後もほぼ保存さ
れる。第3スタンドでは円周方向肉厚分布を均一化する
ためロール穴形はより真円に設計されている。第1スタ
ンド出側の肉厚分布は溝底で薄くその両側は厚くなって
いるので第3スタンドにおいては圧下率は溝底中央より
もその両側部分の方が大きくなる。FIG. 2 shows a specific example in which the rolling reduction is larger on both sides than in the center. For example, since the roll hole shape of the first stand is usually an elliptical shape, the circumferential wall thickness of the pipe material on the delivery side of the first stand is thinnest at the center part of the roll groove bottom and becomes thicker as it goes away from it. Since this portion rolled at the roll groove bottom of the first stand is not subjected to reduction in rolling of the second stand, the wall thickness distribution is almost preserved even after passing through the second stand. In the third stand, the roll hole shape is designed to be a more perfect circle in order to make the circumferential wall thickness distribution uniform. Since the wall thickness distribution on the outlet side of the first stand is thin at the groove bottom and thicker on both sides, the reduction ratio in the third stand is larger in both side portions than in the center of the groove bottom.
【0014】第3スタンドと同様の現象は第4スタンド
でも生じる。第2スタンドのロール穴形も普通楕円形な
ので、第2スタンド出側の管材溝底の円周方向肉厚はロ
ール溝底中央部分が一番薄くそこから離れるに従って厚
くなる。第2スタンドのロール溝底で圧延されたこの部
分は第3スタンドの圧延においては圧下を受けないので
この部分の肉厚分布は第3スタンド通過後もほぼ保存さ
れる。第4スタンドでは円周方向肉厚分布を均一化する
ためロール穴形はより真円に設計されている。第2スタ
ンド出側の肉厚分布は溝底で薄くその両側は厚くなって
いるので第4スタンドにおいては圧下率は溝底中央より
もその両側部分の方が大きくなる。The same phenomenon as in the third stand also occurs in the fourth stand. Since the roll hole shape of the second stand is also usually elliptical, the circumferential wall thickness of the tube material groove bottom on the outlet side of the second stand is thinnest at the center part of the roll groove bottom, and becomes thicker as it goes away from it. This portion rolled at the roll groove bottom of the second stand is not subjected to reduction in rolling of the third stand, so that the wall thickness distribution of this portion is substantially preserved even after passing through the third stand. In the fourth stand, the roll hole shape is designed to be a more perfect circle in order to make the thickness distribution in the circumferential direction uniform. Since the thickness distribution on the outlet side of the second stand is thin at the groove bottom and thicker on both sides thereof, in the fourth stand, the rolling reduction is larger at both sides of the groove bottom than in the center of the groove bottom.
【0015】仕上り管材の円周方向肉厚を均一にするた
めに、マンドレルミルの仕上げスタンドのロール穴形は
溝底部分が真円になるように設計されている。一般にマ
ンドレルミルでは第4スタンドから第6スタンドで肉厚
を仕上げる。肉厚仕上げスタンドより上流のスタンドの
どれか一つのロール穴形が楕円であると、後続のいずれ
かのスタンドにおいて円周方向肉厚分布を均一化するた
めに、溝底中央よりもその両側部分で圧下率が大きくな
らざるを得ない。In order to make the thickness of the finished pipe material uniform in the circumferential direction, the roll hole shape of the finishing stand of the mandrel mill is designed so that the groove bottom portion is a perfect circle. Generally, in a mandrel mill, the wall thickness is finished at the 4th to 6th stands. If the roll hole shape of any one of the stands upstream of the thick finish stand is elliptical, in order to make the circumferential wall thickness distribution uniform in any of the following stands, both sides of the groove bottom center Inevitably, the reduction rate increases.
【0016】ロール溝底圧下部分の円周方向圧下率分布
を均一にするためには、マンドレルミルの上流スタンド
のロール溝底中央部の曲率半径をできるだけ溝底間隔の
0.5倍に近づければよい。In order to make the circumferential roll reduction ratio distribution of the roll groove bottom rolling portion uniform, the radius of curvature of the roll groove bottom central portion of the upstream stand of the mandrel mill should be set as much as possible.
It should be close to 0.5 times.
【0017】即ち、図1の代表例に示すように、(1) 第
1スタンドのロール穴形の溝底曲率半径R1がロール溝
底間隔Bの0.54倍以下であることを特徴とするロール穴
形、(2) 第2スタンドのロール穴形の溝底曲率半径R1
がロール溝底間隔Bの0.52倍以下であることを特徴とす
るロール穴形、を有するマンドレルミルを提案するもの
である。That is, as shown in the representative example of FIG. 1, (1) the roll hole shape of the first stand has a groove bottom curvature radius R1 of 0.54 times or less of a roll groove bottom interval B. Shape, (2) Roll hole shape of the second stand, groove radius of curvature R1
Is a roll-hole shape having a roll groove bottom interval B of 0.52 times or less.
【0018】[0018]
【作用】本発明によれば、マンドレルミルにおけるロー
ル穴形において、上流スタンドの穴形溝底曲率半径に上
限値を設けることにより、従来見落とされていた溝底圧
下不均一に起因する「穴明き欠陥」を防止することがで
きる。According to the present invention, in the roll hole shape in the mandrel mill, by providing an upper limit value for the radius of curvature of the groove bottom of the upstream stand, the "hole drilling" caused by the nonuniform groove bottom rolling which has been overlooked in the past. "Defects" can be prevented.
【0019】即ち、第3スタンドで「穴明き欠陥」を生
ずる傾向にあるマンドレルミルでは、第1スタンドのロ
ール穴形の溝底曲率波形をロール溝底間隔の0.54倍以下
に設計することにより、第3スタンド溝底における圧下
率の円周方向分布が均一化でき、実用上「穴明き欠陥」
を防止することができる。同様に第4スタンドで「穴明
き欠陥」を生ずる傾向にあるマンドレルミルでは、第2
スタンドのロール穴形の溝底曲率半径をロール溝底間隔
の0.52倍以下に設計することにより、第4スタンド溝底
における圧下率の円周方向分布が均一化でき、実用上
「穴明き欠陥」を防止することができる。That is, in a mandrel mill that tends to cause "hole defects" in the third stand, by designing the roll bottom groove-shaped curvature waveform of the first stand to be 0.54 times or less than the roll groove bottom interval. , The circumferential distribution of the rolling reduction at the bottom of the third stand groove can be made uniform, which is a "perforated defect" in practical use.
Can be prevented. Similarly, the mandrel mill, which tends to cause "drilling defects" in the 4th stand,
By designing the roll hole shape radius of the roll of the stand to be 0.52 times or less than the roll groove bottom interval, the circumferential distribution of the rolling reduction at the 4th stand groove bottom can be made uniform and, in practice, "hole-defects Can be prevented.
【0020】尚、マンドレルミルにおいて、「穴明き欠
陥」が第3スタンドと第4スタンドのいずれか一方で生
じ、あるいは両方で生ずるか否かは、ミルの個性、ある
いは各スタンドへの圧下配分等に依存する。In the mandrel mill, whether or not the "drilling defect" occurs in either the third stand or the fourth stand, or in both of them depends on the individuality of the mill or the reduction distribution to each stand. Etc.
【0021】[0021]
【実施例】本発明による普通鋼の管材のマンドレルミル
の圧延条件を表1に、圧延結果を表2に示す。本発明に
よる圧延条件では、第1スタンドのロール穴形の溝底曲
率半径をロール溝底間隔の0.54倍、第2スタンドのロー
ル穴形の溝底曲率半径をロール溝底間隔の0.52倍とし、
従来技術による圧延条件では、第1スタンドのロール穴
形の溝底曲率半径をロール溝底間隔の0.6 倍、第2スタ
ンドのロール穴形の溝底曲率半径をロール溝底間隔の0.
55倍とした。EXAMPLES Table 1 shows the rolling conditions of the mandrel mill for a plain steel pipe material according to the present invention, and Table 2 shows the rolling results. In the rolling conditions according to the present invention, the roll-hole-shaped groove bottom radius of curvature of the first stand is 0.54 times the roll groove-bottom spacing, and the roll-hole-shaped groove bottom curvature radius of the second stand is 0.52 times the roll-groove bottom spacing.
Under the rolling conditions according to the conventional technology, the radius of curvature of the grooved groove bottom of the first stand is 0.6 times the gap of the grooved roll groove and the radius of curvature of the grooved groove of the roll stand of the second stand is 0.
55 times.
【0022】[0022]
【表1】 [Table 1]
【0023】[0023]
【表2】 [Table 2]
【0024】本発明による13%Cr鋼の管材のマンドレ
ルミルの圧延条件を表3に、圧延結果を表4に示す。本
発明による圧延条件では、第1スタンドのロール穴形の
溝底曲率半径をロール溝底間隔の0.54倍、第2スタンド
のロール穴形の溝底曲率半径をロール溝底間隔の0.52倍
とし、従来技術による圧延条件では、第1スタンドのロ
ール穴形の溝底曲率半径をロール溝底間隔の0.6 倍、第
2スタンドのロール穴形の溝底曲率半径を溝底曲率半径
をロール溝底間隔の0.55倍とした。Table 3 shows the rolling conditions of the mandrel mill for pipe materials of 13% Cr steel according to the present invention, and Table 4 shows the rolling results. In the rolling conditions according to the present invention, the roll-hole-shaped groove bottom radius of curvature of the first stand is 0.54 times the roll groove-bottom spacing, and the roll-hole-shaped groove bottom curvature radius of the second stand is 0.52 times the roll-groove bottom spacing. Under the rolling conditions according to the conventional technology, the radius of curvature of the groove groove bottom of the first stand is 0.6 times the gap of the groove width of the roll groove, and the radius of curvature of the groove groove of the roll hole of the second stand is the radius of groove groove bottom. 0.55 times.
【0025】[0025]
【表3】 [Table 3]
【0026】[0026]
【表4】 [Table 4]
【0027】本発明によれば、マンドレルミル出側寸法
が外径180mm 、肉厚4mm の普通鋼の管材を、「穴明き欠
陥」無しで製造できることが認められる。According to the present invention, it is recognized that a pipe material of ordinary steel having an outside diameter of 180 mm and a wall thickness of 4 mm of a mandrel mill can be manufactured without "perforating defects".
【0028】また、マンドレルミル出側寸法が外径180m
m 、肉厚5mm の13%Cr鋼の管材を「穴明き欠陥」無し
で製造できることが認められる。The mandrel mill outlet side has an outer diameter of 180 m.
It is recognized that it is possible to manufacture 13% Cr steel tubing with a wall thickness of 5 mm and a wall thickness of 5 mm without "perforation defects".
【0029】[0029]
【発明の効果】本発明を実施するにあたって、現有のマ
ンドレルミルに、新たに装置を付与する必要はない。In carrying out the present invention, it is not necessary to add a new device to the existing mandrel mill.
【0030】本発明によれば、マンドレルミルにおける
第1スタンドと第2スタンドのロール穴形の溝底曲率半
径を設定値以下に設計することにより、従来溝底中央部
分で発生していた「穴明き欠陥」を防止することができ
る。特に肉厚の薄い管材や変形能の劣る高合金鋼のマン
ドレルミル圧延における「穴明き欠陥」を防止する効果
が顕著である。According to the present invention, by designing the roll-hole-shaped groove bottom curvature radii of the first stand and the second stand in the mandrel mill to be equal to or less than a set value, the "hole" which has conventionally been generated in the central part of the groove bottom is formed. It is possible to prevent "bright defects". In particular, the effect of preventing "drilling defects" in mandrel mill rolling of thin-walled pipe materials and high-alloy steel with poor deformability is remarkable.
【図1】図1は本発明のロール穴形を示す図である。FIG. 1 is a view showing a roll hole shape of the present invention.
【図2】図2はマンドレルミルの第3スタンドにおい
て、圧下率が溝底中央で小さくその両側で大きくなるこ
とを説明する模式図である。FIG. 2 is a schematic diagram for explaining that in the third stand of the mandrel mill, the rolling reduction is small at the center of the groove bottom and large on both sides thereof.
11、12、13 穴形ロール 4 マンドレルバー 5 管材 11, 12, 13 Hole type roll 4 Mandrel bar 5 Tubing
Claims (3)
ら穴形ロールスタンドが形成するロール穴形配列内にマ
ンドレルバーを配置し、管を圧延するマンドレルミルに
おいて、第1スタンドのロール穴形の溝底曲率半径がロ
ール溝底間隔の0.54倍以下であることを特徴とするマン
ドレルミル。1. A mandrel mill for rolling a pipe, comprising a plurality of hole-shaped roll stands, arranging a mandrel bar in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling a tube of the first stand. The mandrel mill is characterized in that the radius of curvature of the groove bottom is less than 0.54 times the gap between the roll groove bottoms.
ら穴形ロールスタンドが形成するロール穴形配列内にマ
ンドレルバーを配置し、管を圧延するマンドレルミルに
おいて、第2スタンドのロール穴形の溝底曲率半径がロ
ール溝底間隔の0.52倍以下であることを特徴とするマン
ドレルミル。2. A mandrel mill having a plurality of hole-shaped roll stands, wherein a mandrel bar is arranged in a roll hole-shaped arrangement formed by the hole-shaped roll stands, and a tube is rolled, in a mandrel mill. The mandrel mill is characterized in that the radius of curvature of the groove bottom is less than 0.52 times the gap between the roll groove bottoms.
ら穴形ロールスタンドが形成するロール穴形配列内にマ
ンドレルバーを配置し、管を圧延するマンドレルミルに
おいて、第1スタンドのロール穴形の溝底曲率半径がロ
ール溝底間隔の0.54倍以下であり、且つ第2スタンドの
ロール穴形の溝底曲率半径がロール溝底間隔の0.52倍以
下であることを特徴とするマンドレルミル。3. A mandrel mill for rolling a pipe, comprising a plurality of hole-shaped roll stands, arranging a mandrel bar in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling hole shapes of the first stand. The mandrel mill is characterized in that the groove bottom radius of curvature is 0.54 times or less than the roll groove bottom spacing, and the roll hole type groove bottom curvature radius of the second stand is 0.52 times or less than the roll groove bottom spacing.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3233835A JPH07102369B2 (en) | 1991-08-22 | 1991-08-22 | Mandrel mill |
CA 2076402 CA2076402C (en) | 1991-08-22 | 1992-08-19 | Mandrel mill for seamless steel tubes |
EP19920307612 EP0529943A3 (en) | 1991-08-22 | 1992-08-20 | Mandrel mill for seamless steel tubes |
US08/231,333 US5513511A (en) | 1991-08-22 | 1994-04-22 | Method of producing seamless steel tube by using mandrel mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3233835A JPH07102369B2 (en) | 1991-08-22 | 1991-08-22 | Mandrel mill |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0550115A true JPH0550115A (en) | 1993-03-02 |
JPH07102369B2 JPH07102369B2 (en) | 1995-11-08 |
Family
ID=16961316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3233835A Expired - Fee Related JPH07102369B2 (en) | 1991-08-22 | 1991-08-22 | Mandrel mill |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0529943A3 (en) |
JP (1) | JPH07102369B2 (en) |
CA (1) | CA2076402C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008146493A1 (en) * | 2007-05-31 | 2008-12-04 | Sumitomo Metal Industries, Ltd. | Mandrel mill and process for manufacturing seamless pipe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008119706A (en) | 2006-11-09 | 2008-05-29 | Sumitomo Metal Ind Ltd | Mandrel mill and operation method thereof, and method for manufacturing seamless pipe |
CN114309076B (en) * | 2020-09-30 | 2023-05-16 | 宝武特种冶金有限公司 | Precision trimming method for ring hole type of seamless steel tube cold rolling mill |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58224155A (en) * | 1982-06-19 | 1983-12-26 | Kawasaki Steel Corp | Seamless two-phase stainless steel pipe and its manufacture |
JPS60106603A (en) * | 1983-11-15 | 1985-06-12 | Kawasaki Steel Corp | Manufacture of seamless steel pipe |
JPS6384720A (en) * | 1986-09-30 | 1988-04-15 | Kawasaki Steel Corp | Manufacture of seamless pipe by mandrel mill |
JPH01186205A (en) * | 1988-01-22 | 1989-07-25 | Nippon Steel Corp | Mandrel mill for manufacturing seamless steel tube |
JPH01284411A (en) * | 1988-05-09 | 1989-11-15 | Nkk Corp | Caliber roll for mandrel mill |
-
1991
- 1991-08-22 JP JP3233835A patent/JPH07102369B2/en not_active Expired - Fee Related
-
1992
- 1992-08-19 CA CA 2076402 patent/CA2076402C/en not_active Expired - Fee Related
- 1992-08-20 EP EP19920307612 patent/EP0529943A3/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008146493A1 (en) * | 2007-05-31 | 2008-12-04 | Sumitomo Metal Industries, Ltd. | Mandrel mill and process for manufacturing seamless pipe |
JP2008296250A (en) * | 2007-05-31 | 2008-12-11 | Sumitomo Metal Ind Ltd | Mandrel mill, and method for manufacturing seamless pipe |
US8584498B2 (en) | 2007-05-31 | 2013-11-19 | Nippon Steel & Sumitomo Metal Corporation | Mandrel mill and method for manufacturing seamless pipe or tube |
Also Published As
Publication number | Publication date |
---|---|
CA2076402A1 (en) | 1993-02-23 |
EP0529943A3 (en) | 1993-06-30 |
JPH07102369B2 (en) | 1995-11-08 |
CA2076402C (en) | 1996-03-05 |
EP0529943A2 (en) | 1993-03-03 |
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A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980707 |
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LAPS | Cancellation because of no payment of annual fees |