JPS6012130B2 - Continuous manufacturing method for seamless steel pipes with different outside diameters - Google Patents
Continuous manufacturing method for seamless steel pipes with different outside diametersInfo
- Publication number
- JPS6012130B2 JPS6012130B2 JP18276680A JP18276680A JPS6012130B2 JP S6012130 B2 JPS6012130 B2 JP S6012130B2 JP 18276680 A JP18276680 A JP 18276680A JP 18276680 A JP18276680 A JP 18276680A JP S6012130 B2 JPS6012130 B2 JP S6012130B2
- Authority
- JP
- Japan
- Prior art keywords
- sizer
- steel pipes
- seamless steel
- outside diameters
- continuous manufacturing
- 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
Links
Description
【発明の詳細な説明】
この発明は１本の母管から外径の異なる継目無鋼管を得
る方法、すなわち走間で外径を変更する継目無鋼管製造
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining seamless steel pipes having different outer diameters from one main pipe, that is, a method for producing seamless steel pipes in which the outer diameter is changed between runs.
連続式鋼管圧延機及びその出側に蓮設したサィザ−の組
合せで目標の外座、肉厚、長さの鋼管の熱間圧延を行な
う場合、製品長が５０−６０肌の長尺管になると、小ロ
ット採取等の目的で１本の管の途中でステップ状に外径
を変える圧延を行なうと能率向上の効果がもたらされる
。When hot rolling a steel pipe with the target outer seat, wall thickness, and length using a combination of a continuous steel pipe rolling mill and a sizer installed on the exit side, the product length is a long pipe with 50-60 skin. Therefore, if rolling is performed to change the outer diameter in steps in the middle of one tube for the purpose of small-lot sampling, etc., efficiency can be improved.
しかしながら従来の継目無鋼管の熱間圧延設備では圧延
中の寸法変更を行なう例はなく、またそのような方法も
提案されていない。本発明はこのような状況に鑑みてな
されたもので、連続式鋼管圧延機で所定の肉厚に圧延し
、これをサィザーにて外径を整える段階でサィザー圧延
中に、すなわち走間でサィザーの圧下位置を変更し、一
本のシェルから複数の異種外径の鋼管を連続的に製造し
ようとするものである。However, in conventional hot rolling equipment for seamless steel pipes, there is no example of changing dimensions during rolling, and no such method has been proposed. The present invention was made in view of the above situation, and involves rolling the steel pipe to a predetermined thickness using a continuous steel pipe rolling mill, and trimming the outer diameter using a sizer. The aim is to continuously manufacture steel pipes with different outside diameters from a single shell by changing the rolling position of the steel pipe.
圧延機で所定肉厚に圧延されてサィザーに噛込まれる１
本のシェルから外径の異なる複数の管を製造する場合、
肉厚が一定の場合と外径と共に肉厚も変る場合とがある
。Rolled to a predetermined thickness using a rolling mill and bitten into a sizer1
When manufacturing multiple tubes with different outer diameters from a book shell,
There are cases where the wall thickness is constant and cases where the wall thickness changes with the outer diameter.
一般にサィザーで外径を圧下する場合、スタンド間張力
すなわちストレッチをかけない場合には外律圧下率のパ
ーセンテージのうち半分のパーセンテージ相当分は増肉
するので、その分だけ圧延機出口のシェルの肉厚を考慮
して圧延しておく必要がある。このことは反面、適当な
ストレッチをかけてサィザーで氏下を与え、外蓬変更前
後各々のストレッチ量を制御することによって肉厚一定
さらには滅肉も可能であることを意味する。このような
条件のもとでシェルをサィザーで圧延している途中でサ
イザーのロールギャップ設定およびロール回転数設定を
変更し、製品管の途中で外径を変えるものである。Generally, when rolling down the outer diameter with a sizer, if tension between stands, that is, stretching is not applied, the thickness will increase by half the percentage of the external reduction rate, so the thickness of the shell at the exit of the rolling mill will increase by that amount. It is necessary to take the thickness into consideration when rolling. On the other hand, this means that it is possible to keep the wall thickness constant or even reduce the thickness by applying appropriate stretching and reducing the material with a sizer, and controlling the amount of stretch before and after changing the outer layer. Under such conditions, the roll gap setting and roll rotation speed setting of the sizer are changed while the shell is being rolled by the sizer, and the outer diameter is changed in the middle of the product tube.
この場合、サィザーへ送り込むシェルは圧延機によって
長さ方向に均一な肉厚に圧延されたものばかりでなく、
途中で肉厚が段付状に変化しているものであってもよい
。第１図にはシェルの種類ａ，ｂ，ｃとそれらから得ら
れる製品鋼管の種類ｄ〜ｉが内厚ないし外隆変更部位の
模式断面図として示されている。また第２図はこの発明
の一実施例におけるサィザーのロール回転数の設定変更
とロールギャップの設定変更の経時的パターンを示す線
図である。第２図によってサィザ−のスケジュール設定
変更を説明すれば以下の通りである。まずロール回転数
設定値Ｎａおよびロールギャップ設定値Ｓａのスケジュ
ールＡからロール回転数設定値Ｎｂおよびロールギャッ
プ設定値ＳｂのスケジュールＢへ変更する場合のロール
回転数並びにロールギャップの変更データ、および１本
のシェル中での変更箇所を指定する。In this case, the shell sent to the sizer is not only rolled to a uniform thickness in the length direction by a rolling machine, but also
The wall thickness may change in a stepped manner along the way. FIG. 1 shows shell types a, b, and c and types d to i of product steel pipes obtained from them as a schematic cross-sectional view of a portion where the inner thickness or outer ridge is changed. Moreover, FIG. 2 is a diagram showing a pattern over time of setting changes in the roll rotation speed of the sizer and changes in the settings of the roll gap in one embodiment of the present invention. The change in schedule settings for the sizer can be explained as follows with reference to FIG. First, change data of roll rotation speed and roll gap when changing from schedule A with roll rotation speed setting value Na and roll gap setting value Sa to schedule B with roll rotation speed setting value Nb and roll gap setting value Sb, and one Specify the changes in the shell.
これによりシェルを変更箇所までスケジュールＡで圧延
し、変更箇所に到達した時点でサィザ−の全スタンドを
自動減速し、定常速度（Ｎａ）の例えば１′ｉｏ程度の
変更用速度Ｎｔまで減速したうえでロールギャップＳａ
をＳｂ＝Ｓａ＋△Ｓに変更する。ロールギャップがＳｂ
に変更完了した時点で全スタンドのロール回転数をＮｂ
まで自動加速し、Ｎｂに達したのちはスケジュールＢの
圧延となるわけである。例えばＮａ＝５の′ｓｅｃ、Ｎ
ｔ＝０．５肌／ｓｅｃ、ＮａからＮｔへの変更に要する
時間が０．＄ｅｃ、ロールギャップの変更に要する時間
が０．＄ｅｃの場合、スケジュール変更に要する管の長
さ１（クロップ長）は約２．９のであり、充分実用的な
歩蟹範囲に納まるものである。以上に述べたようにこの
発明によれば外径の異なる継目無鋼管を一本のシェル中
でサィザーにより走間寸法変更することで高能率に得る
ことができ、圧延能率の向上と小ロット採取に対する歩
留の向上が果せるものである。As a result, the shell is rolled according to Schedule A up to the change point, and when the change point is reached, all stands of the scissor are automatically decelerated to the change speed Nt of about 1'io of the steady speed (Na), and then and roll gap Sa
is changed to Sb=Sa+ΔS. Roll gap is Sb
When the change is completed, the roll rotation speed of all stands will be reduced to Nb.
After reaching Nb, schedule B rolling begins. For example, 'sec of Na=5, N
t=0.5 skin/sec, the time required to change from Na to Nt is 0. $ec, the time required to change the roll gap is 0. In the case of $ec, the tube length 1 (crop length) required to change the schedule is about 2.9, which is well within the practical range. As described above, according to the present invention, seamless steel pipes with different outer diameters can be produced with high efficiency by changing the running dimensions using sizers in one shell, improving rolling efficiency and producing small lots. It is possible to improve the yield compared to the conventional method.
図面の簡単な説明第１図はサィザーへ送り込まれるシェ
ルの種類ａ，ｂ，ｃとそれから本発明によって得られる
製品鋼管の種類ｄ〜ｉを外径変更部位の断面で示した漠
式断面図、第２図はこの発明の一実施例におけるサィザ
ーのロール回転数およびロールギャップのスケジュール
変更の経時的パターンを示す線図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vague cross-sectional view showing the types a, b, and c of the shells sent to the sizer and the types d to i of the product steel pipes obtained from the shells according to the present invention in a cross-section of the outer diameter changing part; FIG. 2 is a diagram showing a pattern over time of schedule changes in the roll rotation speed and roll gap of the sizer in one embodiment of the present invention.
第１図 第２図Figure 1 Figure 2
Claims (1)
より目標外径の継目無鋼管を製造するに際し、サイザー
による圧延の際中にサイザーのロールギヤツプ設定およ
びロール回転数設定を変更することを特徴とする異種外
径寸法の継目無鋼管の連続製造法。1. When manufacturing a seamless steel pipe of a target outer diameter using a steel pipe rolling mill and a sizer connected to the exit side thereof, the roll gap setting and roll rotation speed setting of the sizer are changed during rolling by the sizer. A continuous manufacturing method for seamless steel pipes with different outside diameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18276680A JPS6012130B2 (en) | 1980-12-25 | 1980-12-25 | Continuous manufacturing method for seamless steel pipes with different outside diameters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18276680A JPS6012130B2 (en) | 1980-12-25 | 1980-12-25 | Continuous manufacturing method for seamless steel pipes with different outside diameters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57106415A JPS57106415A (en) | 1982-07-02 |
| JPS6012130B2 true JPS6012130B2 (en) | 1985-03-30 |
Family
ID=16124044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18276680A Expired JPS6012130B2 (en) | 1980-12-25 | 1980-12-25 | Continuous manufacturing method for seamless steel pipes with different outside diameters |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6012130B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014441A (en) * | 2019-12-30 | 2020-04-17 | 常熟希那基汽车零件有限公司 | Manufacturing process of step tube |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855321B (en) * | 2016-05-19 | 2018-12-18 | 常熟市异型钢管有限公司 | A kind of preparation method of high-pressure boiler multiple-internal screw thread seamless steel pipe |
-
1980
- 1980-12-25 JP JP18276680A patent/JPS6012130B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014441A (en) * | 2019-12-30 | 2020-04-17 | 常熟希那基汽车零件有限公司 | Manufacturing process of step tube |
| CN111014441B (en) * | 2019-12-30 | 2021-04-27 | 常熟希那基汽车零件有限公司 | Manufacturing process of step tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57106415A (en) | 1982-07-02 |
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