JPS611413A - Manufacture of thick steel pipe having large diameter - Google Patents
Manufacture of thick steel pipe having large diameterInfo
- Publication number
- JPS611413A JPS611413A JP12184284A JP12184284A JPS611413A JP S611413 A JPS611413 A JP S611413A JP 12184284 A JP12184284 A JP 12184284A JP 12184284 A JP12184284 A JP 12184284A JP S611413 A JPS611413 A JP S611413A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- mandrel
- punching
- thickness
- uneven thickness
- 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.)
- Pending
Links
Landscapes
- Metal Extraction Processes (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、イッシュペンチ方式の押抜き圧延法による
大径厚肉鋼管の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for producing a large-diameter, thick-walled steel pipe by a punch-rolling method using ish pliers.
大径厚肉鋼管の製造方法として、ブツシュペンチ方式の
押抜き圧延法が知られている。この方法は、第９図に概
略縦断面図で示すように、所定温度に加熱された鋼塊１
を、鋼塊１とほぼ同じ形状の内面を有する竪型のコンテ
ナ２内に装入し、次いで、コンテナ２の上部に設けられ
たガイド４によって案内される穿孔用マンドレル３を、
鋼塊１の軸線に沿ってその上面から鋼塊１内に垂直方向
に押し込むことによって、鋼塊１をその底部から所定の
厚みを残して穿孔し、カップ状の底部き管を調製する。As a method for manufacturing large-diameter, thick-walled steel pipes, a push-rolling method using the Butsch pliers method is known. In this method, as shown in a schematic longitudinal cross-sectional view in FIG. 9, a steel ingot heated to a predetermined temperature is
is charged into a vertical container 2 having an inner surface of approximately the same shape as the steel ingot 1, and then a drilling mandrel 3 guided by a guide 4 provided at the top of the container 2,
A cup-shaped tube with a bottom is prepared by perforating the steel ingot 1 with a predetermined thickness remaining from the bottom by pushing vertically into the steel ingot 1 from the top surface along the axis of the steel ingot 1.
次に、第１０図に概略縦断面図で示すように、上記によ
り得られた底部き管５内に、押抜き用マンドレル６を挿
入し、ダイス７内を水平方向に押し抜くことによって、
所定の外径と肉厚とを有する大径厚肉鋼管が製造される
。Next, as shown in a schematic longitudinal cross-sectional view in FIG.
A large-diameter thick-walled steel pipe having a predetermined outer diameter and wall thickness is manufactured.
しかしながら、上述した従来の方法には、鋼塊１を穿孔
してカップ状の底部き管５を調製するための大容量の穿
孔プレス機と、前記カップ状の底部き管５を、ダイス７
内に通して押し抜くための押抜きプレス機とを必要とす
るために、多額の設備費およびメンテナンス費を要し、
製造コストが高くなる上、穿孔時に鋼塊を装入するだめ
のコンテナ２は、鋼塊１の形状や大きさによって、その
都度数シ替える必要があるので、数種類のコンテナ２を
用意しなければならず、そのだめの費用や、コンテナの
取り替えに多くの手間を要するなどの問題があった。However, the above-mentioned conventional method requires a large-capacity punching press machine for punching the steel ingot 1 to prepare the cup-shaped bottom tube 5, and a die 7 for punching the cup-shaped bottom tube 5.
Since a punching press machine is required to punch the material through the inside, a large amount of equipment and maintenance costs are required.
In addition to increasing manufacturing costs, the container 2 into which the steel ingot is charged during drilling needs to be changed several times depending on the shape and size of the steel ingot 1, so it is necessary to prepare several types of containers 2. However, there were problems such as the cost of replenishment and the amount of effort required to replace the container.
そこで、鋼塊を穿孔してカップ状の底部き管を調製する
ために、特別の穿孔プレス機やコンテナを必要とせずに
、底部き管を調製し、しかる後に所定の押抜き加工を施
すことによって所定形状の大径厚肉鋼管を製造する方法
が研究されているが、製造工程中に偏肉が生ずることを
無くすことはできなかった。Therefore, in order to prepare a cup-shaped bottom tube by drilling a steel ingot, the bottom tube is prepared without the need for a special drilling press or container, and then a prescribed punching process is performed. Although research has been conducted on methods of manufacturing large-diameter, thick-walled steel pipes with predetermined shapes, it has not been possible to eliminate uneven thickness during the manufacturing process.
従って、この発明の目的は、上述した問題を解決し、一
度発生した偏肉を、製造工程中にその薄肉側を冷却し降
温させて薄肉側の変形抵抗を増加せしめ、押抜き加工時
の減肉を厚肉側に比し減少させることによって、偏肉の
ない寸法精度の良好な大径厚肉鋼管の製造方法を提供す
ることにある。Therefore, an object of the present invention is to solve the above-mentioned problems, and to reduce the uneven thickness during punching by cooling the thin side of the uneven thickness during the manufacturing process to lower the temperature and increase the deformation resistance of the thin side. It is an object of the present invention to provide a method for manufacturing a large-diameter thick-walled steel pipe with good dimensional accuracy without uneven thickness by reducing the wall thickness compared to the thicker side.
この発明の大径厚肉鋼管の製造方法は、水平に位置して
いる、所定の押抜加工温度を有する底部き管に対し、冷
却媒体によりその薄肉側を冷却して、管周方向に温度差
を生ぜしめた後、その管内に挿入したマンドレルにより
ダイス内を押抜いて、所定寸法の管に成形することに特
徴を有するものである。The method for manufacturing a large-diameter thick-walled steel pipe of the present invention is to cool a thin-walled side of a horizontally positioned bottomed pipe having a predetermined punching temperature with a cooling medium, thereby increasing the temperature in the circumferential direction of the pipe. After creating a difference, the tube is punched out through a die using a mandrel inserted into the tube to form a tube of a predetermined size.
次に、この発明の方法を、図面を参照しながら説明する
。第４図および第５図は、この発明の方法に関連する穿
孔工程の１つの実施態様を示す概略縦断面図である。第
４図および第５図において、８は所定温度に加熱されだ
鋼塊１を、その軸線を水平として載置するだめのテーブ
ル、９はテーブル８上に水平に載置された鋼塊１の端面
が衝接する反力受け、１０はテーブル８上に水平に載置
された鋼塊１を、その軸線に沿って水平に穿孔するため
の穿孔用マンドレル１１が取付けられたプレス機、１２
は穿孔用マンドレル１１をガイドするだめのマンドレル
ガイド、１３はマンドレルガイドのホルダである。Next, the method of the present invention will be explained with reference to the drawings. 4 and 5 are schematic longitudinal sectional views showing one embodiment of the drilling process associated with the method of the present invention. In FIGS. 4 and 5, 8 is a table on which the steel ingot 1 heated to a predetermined temperature is placed with its axis horizontal, and 9 is a table on which the steel ingot 1 is placed horizontally on the table 8. A press machine 12 is equipped with a drilling mandrel 11 for horizontally drilling a steel ingot 1 placed horizontally on a table 8 along its axis;
1 is a mandrel guide for guiding the drilling mandrel 11, and 13 is a holder for the mandrel guide.
プレス機１０は、鋼塊１の穿孔用と、鋼、塊１を穿孔し
て得られた底部き素管の押し抜き用とを兼ねておシ、穿
孔用マンドレル１１を鋼塊内に押し込んで底部き素管を
調製した後は、押抜き用マンドレルによる底部き素管の
押し抜きのために使用される。The press machine 10 serves both for drilling the steel ingot 1 and for punching out the bottom blank tube obtained by drilling the steel ingot 1, and pushes the drilling mandrel 11 into the steel ingot. After the bottom blank tube is prepared, it is used for punching the bottom blank tube using a punching mandrel.
加熱炉によって所定温度に加熱された鋼塊１は、クレー
ン等によって運ばれて、その軸線を水平にしてテーブル
８上に載置される。テーブル８は、シリンダ等によって
その上下方向の位置が調整自在になっておシ、テーブル
８上に載置された鋼塊１は、その軸線が、穿孔用マンド
レル１０と同一軸線となるように位置決めされる。鋼塊
１の端面１ａは、スタンドに固定された反力受け９に当
接させる。A steel ingot 1 heated to a predetermined temperature in a heating furnace is carried by a crane or the like and placed on a table 8 with its axis horizontal. The vertical position of the table 8 is adjustable using a cylinder or the like, and the steel ingot 1 placed on the table 8 is positioned so that its axis is the same as that of the drilling mandrel 10. be done. The end surface 1a of the steel ingot 1 is brought into contact with a reaction force receiver 9 fixed to a stand.
次いで、プレス機１０を作動し、穿孔用マンドレル１１
を水平方向に移動させると、穿孔用マンドレル１１は、
その先端が鋼塊１の他端面１ｂに当接した後、第５図に
示すように、一端が反力受け９によって支承されている
鋼塊１内に、その軸線に沿って押し込まれ、鋼塊１を穿
孔する。かくして、底部き管５が調製される。Next, the press machine 10 is operated, and the drilling mandrel 11 is
When the drilling mandrel 11 is moved horizontally,
After its tip comes into contact with the other end surface 1b of the steel ingot 1, as shown in FIG. Puncture mass 1. Thus, the bottom tube 5 is prepared.
上述のようにして調製された底部き管５は、再熱炉によ
って所定温度まで加熱され、次いで、第６図に概略縦断
面図で示すように、その穿孔部分に押抜き用マンドレル
１４を挿入した後、ダイスホルダ１６に支持されている
ダイス１５内を、前述した穿孔時に使用したプレス機１
０．により、水平方向に押し抜くことによって、所定の
外径と肉厚とを有する大径厚肉鋼管が製造される。The bottomed tube 5 prepared as described above is heated to a predetermined temperature in a reheating furnace, and then, as shown in a schematic longitudinal cross-sectional view in FIG. 6, a punching mandrel 14 is inserted into the perforated portion thereof. After that, the inside of the die 15 supported by the die holder 16 is moved to the press machine 1 used for the above-mentioned drilling.
0. A large-diameter, thick-walled steel pipe having a predetermined outer diameter and wall thickness is manufactured by punching out the pipe in the horizontal direction.
上述した大径厚肉鋼管の製造において問題となる点は、
鋼塊１内に押し込まれる穿孔用マンドレル１１が、鋼塊
１の軸線からずれて曲って押し込まれ、その結果、底部
き管５に第７図に縦断面図で示すように、上部の肉厚が
下部の肉厚より薄くなる偏肉が発生することである。こ
のよう力偏肉ハ、マンドレルガイド１２とマンドレル１
１との間の上部に生ずる隙間によって、マンドレル１１
の先端が上方に偏位する結果生ずるものであり、また、
押抜加工中に生ずる場合もあって、これを防止すること
は困難である。The problems in manufacturing the large-diameter thick-walled steel pipes mentioned above are:
The drilling mandrel 11 that is pushed into the steel ingot 1 is pushed into the steel ingot 1 in a bent manner, deviating from the axis of the steel ingot 1, and as a result, the upper wall thickness of the bottom tube 5 is reduced as shown in the vertical cross-sectional view in FIG. This is the occurrence of uneven thickness, where the thickness of the lower part is thinner than the thickness of the lower part. In this way, the uneven thickness of the force is caused by the mandrel guide 12 and the mandrel 1.
The gap created at the top between mandrel 11 and
This occurs as a result of the tip of the tip being displaced upward, and
This may occur during punching and is difficult to prevent.
との偏肉の生じた底部き管５を、押抜き用マンドレル１
４によってダイス１５により押し抜くと、第８図に示す
ように、前記偏肉はそのまま押抜か゛れた素管５′に形
成される。なお、マンドレル１４による押抜加工時に発
生する偏肉も、上記と同じ現象によるものである。A punching mandrel 1 is used to punch the bottom tube 5 with uneven thickness
4 and punched out with a die 15, the uneven thickness is directly formed into a blank tube 5' as shown in FIG. Incidentally, the uneven thickness that occurs during the punching process using the mandrel 14 is also due to the same phenomenon as described above.
そこで、この発明においては、上記偏肉の生じた底部き
管５を再熱炉によって所定温度捷で加熱した後、第１図
に示すように、その薄肉側の上部を、冷却水供給管エフ
から噴射される冷却水１８によって、所定温度まで冷却
し、管周方向に温度差を生ぜしめる。Therefore, in the present invention, after heating the bottom pipe 5 with the uneven thickness at a predetermined temperature in a reheating furnace, the upper part of the thin wall side is heated to the cooling water supply pipe 5 as shown in FIG. The cooling water 18 injected from the pipe cools the pipe to a predetermined temperature, creating a temperature difference in the circumferential direction of the pipe.
このように薄肉部を上部にして上方より冷却媒体を噴射
または流下させることにより、上部の薄肉側と下部の厚
肉側は、スムーズに温度勾配をとることかできる。In this way, by injecting or flowing the cooling medium from above with the thin wall portion at the top, a smooth temperature gradient can be created between the thin wall side at the top and the thick wall side at the bottom.
第３図は、本発明方法によって冷却した場合の偏肉率を
示すグラフである。薄肉側の温度を、１００〜３００℃
降下させて押抜加工を施した結果、第１０図に示すよう
に、従来６５％程度あった偏肉率を２０％以下に矯正す
ることができた。FIG. 3 is a graph showing the thickness unevenness when cooling is performed by the method of the present invention. The temperature of the thin side is 100-300℃
As a result of lowering the material and performing the punching process, as shown in FIG. 10, it was possible to correct the unevenness in thickness, which was approximately 65% in the past, to 20% or less.
このようにして、薄肉側の上部が、下部より温度の低い
底部き管５を、第２図に概略縦断面図で示すように、そ
の穿孔部分に押抜き用マンドレル１４を挿入した後、ダ
イスホルダ１６に支持されているダイス１５内を押し抜
くときは、底部き管５の温度の低い上部は変形抵抗が太
きいため変形しにくく、一方温度の高い下部は変形抵抗
が小さいため、この上部と下部との変形抵抗の差によっ
て、ダイス１５から押し抜かれた底部き管５′の肉厚は
均一になり、偏肉のない大径厚肉鋼管を製造することが
できる。In this way, after inserting the punching mandrel 14 into the perforated portion of the bottom tube 5 whose thin-walled upper portion has a lower temperature than the lower portion, as shown in the schematic longitudinal cross-sectional view in FIG. When punching out the inside of the die 15 supported by the bottom tube 5, the lower temperature of the lower part of the bottom tube 5 has a large deformation resistance, so it is difficult to deform, while the high temperature lower part has a small deformation resistance, so it is difficult to deform. Due to the difference in deformation resistance with the lower part, the wall thickness of the bottom tube 5' punched out from the die 15 becomes uniform, and a large-diameter thick-walled steel tube without uneven thickness can be manufactured.
以上述べたように、この発明の方法によれば、偏肉の生
じている素管または押抜き加工中に生ずる偏肉を矯正す
ることができ、歩留の向上が図られ、ひいては寸法精度
の高くない素管の救済ができ従って押抜き用素管を製造
する鋼塊穿孔寸法の許容巾を大きくでき、穿孔手段の多
様化が図れる等、多くの優れた効果がもたらされる。As described above, according to the method of the present invention, it is possible to correct unbalanced raw tubes or unbalanced thickness that occurs during punching, improve yield, and improve dimensional accuracy. Many excellent effects are brought about, such as the ability to salvage inexpensive blank pipes, increase the permissible width of the perforation size of steel ingots for producing blank pipes for punching, and diversify perforation means.
第１図はこの発明の方法による底部き＼管の冷却状態を
示す説明図、第２図は同じく底部き管の押し抜き状態を
示す説明図、第３図はこの発明の方法によって製造され
た管の偏肉率を示すグラフ、第４図及び第５図はこの発
明の方法に関連する穿孔工程を示す概略断面図、第６図
は押抜加工状態を示す概略断面図、第７図は偏肉底部き
管の押抜き時の縦断面図、第８図は偏肉の生じた底部き
管の押抜き状態を示す説明図、第９図および第１０図は
従来の方法を示す概略縦断面図である。図面において、
１・・・鋼塊、 ２・・・コンテナ、３・
・・穿孔用マンドレル、４・・・ガイド、５・・・底部
き管、 ６・・・押抜き用マンドレル、７・
ダイス、 ８・・テーブル、９・・・反力受
け、 １ｏ ・プレス機、１１・・穿孔用マン
ドレル、１２・・・マンドレルガイド、１３・・・ホル
ダ、 １４・・・押抜き用マンドレル、１５
・・・ダイス、 １６・・・ダイスホルダ、１
７・・・冷却水供給管、 １８・冷却水。FIG. 1 is an explanatory diagram showing the cooling state of a bottom-opening tube by the method of the present invention, FIG. 2 is an explanatory diagram showing the punching state of the bottom-opening tube, and FIG. 3 is an explanatory diagram showing the state of the bottom-opening tube manufactured by the method of the present invention. A graph showing the thickness unevenness ratio of a pipe, FIGS. 4 and 5 are schematic cross-sectional views showing the drilling process related to the method of the present invention, FIG. 6 is a schematic cross-sectional view showing the punching state, and FIG. A vertical cross-sectional view of a tube with uneven thickness at the bottom during punching, FIG. 8 is an explanatory view showing the state of punching out a tube with uneven thickness at the bottom, and FIGS. 9 and 10 are schematic longitudinal cross-sections showing the conventional method. It is a front view. In the drawings, 1... Steel ingot, 2... Container, 3...
... Mandrel for drilling, 4... Guide, 5... Bottom tube, 6... Mandrel for punching, 7.
Dice, 8...Table, 9...Reaction force receiver, 1o.Press machine, 11...Drilling mandrel, 12...Mandrel guide, 13...Holder, 14...Punching mandrel, 15
...Dice, 16...Dice holder, 1
7...Cooling water supply pipe, 18.Cooling water.
Claims (1)
部き管に対し、冷却媒体によりその薄肉側を冷却して、
管周方向に温度差を生ぜしめた後、その管内に挿入した
マンドレルによりダイス内を押抜いて、所定寸法の管に
成形することを特徴とする大径厚肉鋼管の製造方法。A horizontally positioned bottom tube having a predetermined punching temperature is cooled with a cooling medium on its thin side.
A method for manufacturing a large-diameter, thick-walled steel pipe, which comprises creating a temperature difference in the circumferential direction of the pipe, and then punching out the inside of a die using a mandrel inserted into the pipe to form a pipe of predetermined dimensions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12184284A JPS611413A (en) | 1984-06-15 | 1984-06-15 | Manufacture of thick steel pipe having large diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12184284A JPS611413A (en) | 1984-06-15 | 1984-06-15 | Manufacture of thick steel pipe having large diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS611413A true JPS611413A (en) | 1986-01-07 |
Family
ID=14821281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12184284A Pending JPS611413A (en) | 1984-06-15 | 1984-06-15 | Manufacture of thick steel pipe having large diameter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS611413A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5040399A (en) * | 1989-06-30 | 1991-08-20 | Hoesch Ag | Method of fabricating box section from steel with walls that differ in thickness |
| WO2013171935A1 (en) * | 2012-05-14 | 2013-11-21 | 新日鐵住金株式会社 | Method for manufacturing seamless pipe |
-
1984
- 1984-06-15 JP JP12184284A patent/JPS611413A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5040399A (en) * | 1989-06-30 | 1991-08-20 | Hoesch Ag | Method of fabricating box section from steel with walls that differ in thickness |
| WO2013171935A1 (en) * | 2012-05-14 | 2013-11-21 | 新日鐵住金株式会社 | Method for manufacturing seamless pipe |
| CN103974788A (en) * | 2012-05-14 | 2014-08-06 | 新日铁住金株式会社 | Method for manufacturing seamless pipe |
| CN103974788B (en) * | 2012-05-14 | 2015-08-26 | 新日铁住金株式会社 | The manufacture method of seamless steel pipe |
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