JP2000351012A - Manufacture of seamless steel tube - Google Patents
Manufacture of seamless steel tubeInfo
- Publication number
- JP2000351012A JP2000351012A JP11162576A JP16257699A JP2000351012A JP 2000351012 A JP2000351012 A JP 2000351012A JP 11162576 A JP11162576 A JP 11162576A JP 16257699 A JP16257699 A JP 16257699A JP 2000351012 A JP2000351012 A JP 2000351012A
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- seamless steel
- steel pipe
- value
- measured
- 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
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、目標の肉厚に制御
された継目無鋼管を安定して製造することのできる継目
無鋼管の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a seamless steel pipe capable of stably manufacturing a seamless steel pipe having a controlled thickness.
【０００２】[0002]
【従来の技術】継目無鋼管の製造時における肉厚の測定
は、継目無鋼管の素材である鋼片の重量、製造された継
目無鋼管の長さ測定値、及びロールバイト径（継目無鋼
管の外径に相当）の３つの要素から計算により算出する
方法と、透過放射線を用いた放射線厚み計により測定す
る方法の２つの方法により行われ、その測定値は、継目
無鋼管の肉厚制御のために製造条件にフィードバックさ
れている。2. Description of the Related Art The thickness of a seamless steel pipe at the time of manufacture is measured by measuring the weight of a steel slab, the measured length of the manufactured seamless steel pipe, and the roll bite diameter (seamless steel pipe). The outer diameter of the seamless steel pipe) and a method of measuring with a radiation thickness meter using transmitted radiation. The measured values are used to control the thickness of the seamless steel pipe. Due to feedback on manufacturing conditions.
【０００３】放射線厚み計による測定方法は、図６に示
すように継目無鋼管５１の一方側から、γ線照射器５２
によりγ線ビーム５３を照射し、継目無鋼管５１を透過
したγ線ビーム５３を、継目無鋼管５１を挟んでγ線照
射器５２と対向して配置したγ線検出器５４で検出し、
下記の（２）式により肉厚を求めるものである。但し
（２）式において、Ｉはγ線の透過量、Ｉ0 はγ線の照
射量、μはγ線吸収係数、ｔは継目無鋼管の肉厚であ
る。 Ｉ＝Ｉ0 exp（−μｔ）……（２）As shown in FIG. 6, a measuring method using a radiation thickness gauge is such that a γ-ray irradiator 52
Irradiates the γ-ray beam 53, and detects the γ-ray beam 53 transmitted through the seamless steel pipe 51 with the γ-ray detector 54 arranged opposite to the γ-ray irradiator 52 with the seamless steel pipe 51 interposed therebetween.
The thickness is determined by the following equation (2). In the equation (2), I is the transmission amount of γ-ray, I 0 is the irradiation amount of γ-ray, μ is the γ-ray absorption coefficient, and t is the wall thickness of the seamless steel pipe. I = I 0 exp (−μt) (2)
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た従来の肉厚測定方法には、次のような問題点がある。
即ち、継目無鋼管の先端部及び後端部の圧延時における
非定常部では、中央部に対して肉厚が変動するが、鋼片
の重量、継目無鋼管の長さ測定値、及びロールバイト径
の３つの要素から算出する方法では、この非定常部の肉
厚変動が反映できず、正確性に欠ける。又、放射線厚み
計による測定では、継目無鋼管の非定常部における肉厚
変動は測定できるが、圧延中の振動等により測定値の絶
対値の精度が良くない。However, the above-mentioned conventional thickness measuring method has the following problems.
That is, in the unsteady part of the seamless steel pipe at the leading end and the rear end during rolling, the wall thickness fluctuates with respect to the central part, but the weight of the slab, the measured value of the seamless steel pipe length, and the roll bite The method of calculating from the three elements of the diameter cannot reflect the variation in the thickness of the unsteady portion, and lacks accuracy. Further, in the measurement by the radiation thickness gauge, the thickness variation in the unsteady part of the seamless steel pipe can be measured, but the accuracy of the absolute value of the measured value is not good due to vibration during rolling.
【０００５】従って、従来の肉厚測定方法による肉厚測
定値に基づき、肉厚が目標となるべく製造条件を制御し
ても、目標とする肉厚の的中率は低く、肉厚不良により
不合格となる場合も生じていた。Therefore, even if the manufacturing conditions are controlled so that the target thickness is based on the measured thickness values obtained by the conventional thickness measurement method, the target hit ratio of the target thickness is low, and the target thickness is poor due to poor thickness. In some cases, it was passed.
【０００６】本発明は上記事情に鑑みなされたもので、
その目的とするところは、放射線厚み計を用いながら、
圧延される継目無鋼管の肉厚を目標とする肉厚に近づけ
ることのできる継目無鋼管の製造方法を提供することで
ある。The present invention has been made in view of the above circumstances,
The purpose is to use a radiation thickness gauge,
An object of the present invention is to provide a method of manufacturing a seamless steel pipe that can bring the thickness of a seamless steel pipe to be rolled closer to a target thickness.
【０００７】[0007]
【課題を解決するための手段】本発明に係る継目無鋼管
の製造方法は、圧延ロールにより圧延した継目無鋼管の
肉厚を放射線厚み計により全長に渡って測定すると共に
継目無鋼管の長さを測定し、得られた肉厚測定値ｔ及び
長さ測定値Ｌと圧延ロールのロールバイト径とを用いて
継目無鋼管の計算重量Ｗ1 を求め、前記肉厚測定値ｔ
と、求めた計算重量Ｗ1 と、この継目無鋼管の圧延前の
鋼片段階で予め測定した実貫重量Ｗ0 とを用いて（１）
式により継目無鋼管の肉厚を修正し、修正して得られた
修正肉厚値ｔS と肉厚目標値ｔ0 とを比較して、修正肉
厚値ｔS と肉厚目標値ｔ0 との差が小さくなるように、
その差に基づき圧延ロールの回転数を制御することを特
徴とするものである。 ｔS＝ｔ×［１＋（Ｗ0−Ｗ1）／Ｗ0］……（１）SUMMARY OF THE INVENTION A method of manufacturing a seamless steel pipe according to the present invention comprises measuring the wall thickness of a seamless steel pipe rolled by a rolling roll over the entire length by using a radiation thickness gauge and measuring the length of the seamless steel pipe. was measured to obtain the calculated weight W 1 of the seamless steel pipe with a resulting wall thickness measurement value t and the length measurement L and the roll bite size of the rolling rolls, the wall thickness measuring value t
Using the calculated weight W 1 and the actual weight W 0 measured in advance in the billet stage before rolling the seamless steel pipe (1).
Correct the thickness of the seamless steel pipe by the formula, by comparing the modified meat thickness value t S and the thickness target value t 0 obtained by correcting, modifying meat thickness value t S and the thickness target value t 0 So that the difference between
It is characterized in that the number of rotations of the rolling roll is controlled based on the difference. t S = t × [1+ (W 0 −W 1 ) / W 0 ] (1)
【０００８】放射線厚み計を用いて測定した継目無鋼管
の先端から後端に渡っての肉厚分布には、肉厚の絶対値
がプラス側若しくはマイナス側に偏った状態となること
が多い。本発明においては、この偏りを鋼片段階の実貫
重量Ｗ0 と、継目無鋼管の肉厚測定値ｔ及び長さ測定値
Ｌから算出される計算重量Ｗ1 とを用いて、（１）式に
示すように、その差に応じて修正しているので、修正し
て得られた肉厚値ｔSは肉厚の絶対値に近いものとな
る。In the thickness distribution from the front end to the rear end of the seamless steel pipe measured using a radiation thickness gauge, the absolute value of the thickness is often in a state of being biased to the plus side or the minus side. In the present invention, this deviation is calculated using the actual weight W 0 of the billet stage and the calculated weight W 1 calculated from the measured thickness t and the measured length L of the seamless steel pipe, as follows: As shown in the equation, since the correction is made according to the difference, the corrected thickness value t S is close to the absolute value of the thickness.
【０００９】そして、この修正した肉厚値ｔS に基づい
て圧延ロールの回転数を制御するので、正確な継目無鋼
管の肉厚制御が行われ、肉厚目標値ｔ0 に近い継目無鋼
管を安定して製造することが可能となる。Then, since the rotation speed of the rolling roll is controlled based on the corrected thickness value t S , accurate control of the thickness of the seamless steel pipe is performed, and the seamless steel pipe close to the target thickness value t 0 is obtained. Can be manufactured stably.
【００１０】[0010]
【発明の実施の形態】以下、本発明を図面を参照して説
明する。図１は本発明の実施の形態例を示す図であっ
て、継目無鋼管の製造装置の概略構成図、図２は本発明
に係る継目無鋼管の製造方法を示すフローチャートであ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of the present invention, and is a schematic configuration diagram of an apparatus for manufacturing a seamless steel pipe, and FIG. 2 is a flowchart showing a method for manufacturing a seamless steel pipe according to the present invention.
【００１１】最初に、図１を用いて継目無鋼管の製造装
置を説明する。図１において、１は継目無鋼管の素材で
ある鋼片で、２は鋼片１をプラグミル、マンドレルミル
等により圧延して製造した継目無素管で、３は継目無素
管２を圧延して製造した継目無鋼管である。４は鋼片１
を秤量するための秤量機である。５はストレッチレデュ
ーサーで、絞り圧延機とも呼ばれ、継目無鋼管３の外径
及び肉厚を最終的に決める圧延装置で、本実施の形態で
は継目無素管２を圧延して継目無鋼管３を製造する圧延
機として使用される。６は圧延ロールで、ストレッチレ
デューサー５は複数の圧延ロール６を１組として配置さ
れた圧延スタンドを圧延方向に複数基並べて構成されて
いる。７はモーターで、各圧延スタンド毎に配置されて
おり、各圧延スタンドの圧延ロール６を駆動する。８は
モーター制御装置で、各圧延スタンドに配置されたモー
ター７の回転数を各モーター７毎に個別に制御する。９
は熱間放射線厚み計で、ストレッチレデューサー５の出
側直後で継目無鋼管３の肉厚を測定する。１０は熱間測
長計で、長さ検出用カメラ１１を備えており、継目無鋼
管３の長さを測定する。１２は生産管理用計算機で、予
め決定されている製造諸元を入出力する。１３は圧延制
御用計算機で、秤量機４により測定されたデータと、熱
間放射線厚み計９及び熱間測長計１０により測定された
データと、生産管理用計算機１２から入力されたデータ
とから、モーター制御装置を介して各スタンドのモータ
ー７の回転数を制御する。First, an apparatus for manufacturing a seamless steel pipe will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a steel slab which is a material of a seamless steel pipe, reference numeral 2 denotes a seamless pipe manufactured by rolling a steel slab 1 by a plug mill, a mandrel mill, or the like, and reference numeral 3 denotes a rolled seamless pipe 2. It is a seamless steel pipe manufactured by 4 is a billet 1
Is a weighing machine for weighing. Reference numeral 5 denotes a stretch reducer, also referred to as a rolling mill, which is a rolling device that finally determines the outer diameter and wall thickness of the seamless steel pipe 3. In the present embodiment, the seamless raw pipe 2 is rolled to seamless steel pipe 3. Used as a rolling mill. Reference numeral 6 denotes a rolling roll, and the stretch reducer 5 is configured by arranging a plurality of rolling stands in which a plurality of rolling rolls 6 are arranged as a set in the rolling direction. A motor 7 is arranged for each rolling stand and drives a rolling roll 6 of each rolling stand. Reference numeral 8 denotes a motor control device that individually controls the number of rotations of the motors 7 arranged in each rolling stand for each motor 7. 9
Is a hot radiation thickness gauge, which measures the wall thickness of the seamless steel pipe 3 immediately after the stretch reducer 5 exits. Reference numeral 10 denotes a hot length measuring instrument having a length detecting camera 11 for measuring the length of the seamless steel pipe 3. Reference numeral 12 denotes a production management computer for inputting and outputting predetermined manufacturing data. Reference numeral 13 denotes a rolling control computer, which is based on data measured by the weighing machine 4, data measured by the hot radiation thickness meter 9 and the hot length meter 10, and data input from the production management computer 12. The number of rotations of the motor 7 of each stand is controlled via the motor control device.
【００１２】次に、この構成の継目無鋼管の製造装置を
用いた本発明に係る継目無鋼管の製造方法を図２を参照
して説明する。Next, a method for manufacturing a seamless steel pipe according to the present invention using the apparatus for manufacturing a seamless steel pipe having this configuration will be described with reference to FIG.
【００１３】先ず、継目無鋼管３の製造諸元を生産管理
用計算機１２に入力する（ステップＳ１）。入力する製
造諸元は、継目無鋼管３の肉厚目標値ｔ0 、外径、規格
等である。そして、この継目無鋼管３の素材である鋼片
１の実貫重量Ｗ0 を秤量機４にて測定し（Ｓ２）、測定
した実貫重量Ｗ0 のデータを秤量機４から圧延制御用計
算機１３に入力する。秤量後、この鋼片１をプラグミ
ル、マンドレルミル等を用いて圧延し、継目無素管２を
製造する。First, the manufacturing specifications of the seamless steel pipe 3 are input to the production management computer 12 (step S1). The manufacturing specifications to be input include the target wall thickness t 0 , the outer diameter, and the standard of the seamless steel pipe 3. Then, the actual penetration weight W 0 of the steel slab 1 as the material of the seamless steel pipe 3 is measured by the weighing machine 4 (S2), and the measured data of the actual penetration weight W 0 is transmitted from the weighing machine 4 to the rolling control computer. Input to 13. After the weighing, the steel slab 1 is rolled using a plug mill, a mandrel mill or the like to produce a seamless pipe 2.
【００１４】次いで、この継目無素管２をストレッチレ
デューサー５で圧延する。圧延に際して、圧延制御用計
算機１３は、生産管理用計算機１２から入力された製造
諸元、及び秤量機４から入力された実貫重量Ｗ0 に基づ
き圧延ロール６の回転数を決定し（Ｓ３）、その信号を
モーター制御装置８に入力する。そして、モーター制御
装置８により圧延ロール６の回転数を決定された所定の
回転数に制御して、継目無素管２の圧延を実施し（Ｓ
４）、継目無鋼管３を製造する。Next, the seamless pipe 2 is rolled by a stretch reducer 5. At the time of rolling, the rolling control computer 13 determines the number of rotations of the rolling roll 6 based on the manufacturing specifications input from the production management computer 12 and the actual weight W 0 input from the weighing machine 4 (S3). Are input to the motor control device 8. Then, the motor control device 8 controls the rotation speed of the rolling roll 6 to the determined predetermined rotation speed to perform rolling of the seamless pipe 2 (S
4) The seamless steel pipe 3 is manufactured.
【００１５】製造した継目無鋼管３の肉厚を熱間放射線
厚み計９により全長に渡って測定し（Ｓ５）、測定され
た各位置毎の肉厚測定値ｔを熱間放射線厚み計９から圧
延制御用計算機１３に入力する。又、肉厚測定後、熱間
測長計１０により継目無鋼管３の長さを測定し、測定さ
れた長さ測定値Ｌを熱間測長計１０から圧延制御用計算
機１３に入力する。The thickness of the manufactured seamless steel pipe 3 is measured over the entire length by the hot radiation thickness gauge 9 (S5), and the measured thickness t at each position is measured from the hot radiation thickness gauge 9. It is input to the rolling control computer 13. After the wall thickness is measured, the length of the seamless steel pipe 3 is measured by the hot length meter 10, and the measured length L is input from the hot length meter 10 to the rolling control computer 13.
【００１６】圧延制御用計算機１３は、継目無鋼管３の
先端から後端までのＮ個の肉厚測定値ｔのデータと、長
さ測定値Ｌのデータとを用いて、（３）式により継目無
鋼管３の計算重量Ｗ1 を算出する。但し（３）式におい
て、ΔＬは熱間放射線厚み計９による肉厚測定ピッチで
（４）式により算出され、Ｄは継目無鋼管３の外径、ρ
は継目無鋼管３の比重である。尚、Ｄは生産管理用計算
機１２から入力される圧延目標外径、即ち、ストレッチ
レデューサー５の最終スタンドのロールバイト径に、鋼
種及び管肉厚毎の収縮代αを掛けたものを使用すれば良
い。 Ｗ1 ＝ΣΔＬ×π×（Ｄ−ｔ）×ｔ×ρ……（３） ΔＬ＝Ｌ／Ｎ……（４）The rolling control computer 13 uses the data of the N measured wall thicknesses t from the front end to the rear end of the seamless steel pipe 3 and the data of the measured length L according to equation (3). calculating the calculated weight W 1 of the seamless steel pipe 3. However, in the equation (3), ΔL is the thickness measurement pitch by the hot radiation thickness gauge 9 and is calculated by the equation (4), and D is the outer diameter of the seamless steel pipe 3, ρ
Is the specific gravity of the seamless steel pipe 3. Note that D is a value obtained by multiplying the rolling target outer diameter input from the production management computer 12, that is, the roll bite diameter of the final stand of the stretch reducer 5 by the shrinkage allowance α for each steel type and pipe wall thickness. good. W 1 = ΣΔL × π × (Dt) × t × ρ (3) ΔL = L / N (4)
【００１７】圧延制御用計算機１３は、計算重量Ｗ1 と
実貫重量Ｗ0 とに基づき肉厚測定値ｔを前述の（１）式
により修正し（Ｓ６）、修正肉厚値ｔS を算出する。即
ち、継目無鋼管３の肉厚分布を、図３に示す実線の分布
から破線の分布に修正する。尚、図３では修正肉厚値ｔ
S の方が肉厚測定値ｔより大きい場合を示しているが、
当然、逆の場合もあるThe rolling control computer 13 corrects the measured thickness t based on the calculated weight W 1 and the actual penetration weight W 0 according to the above equation (1) (S6), and calculates the corrected thickness t S. I do. That is, the wall thickness distribution of the seamless steel pipe 3 is corrected from the solid line distribution shown in FIG. 3 to the broken line distribution. In FIG. 3, the corrected thickness t
The case where S is larger than the measured thickness t is shown,
Of course, sometimes the opposite is true
【００１８】圧延制御用計算機１３は、求めた修正肉厚
値ｔS と生産管理用計算機１２から入力された肉厚目標
値ｔ0 とを比較して（Ｓ７）、修正肉厚値ｔS が肉厚目
標値ｔ0 と異なる時には、その差が少なくなるように圧
延ロール６の回転数を変更し（Ｓ８）、変更したロール
回転数で次回の圧延を実施する。又、修正肉厚値ｔSが
肉厚目標値ｔ0 と同じであれば、圧延ロール６の回転数
を変更せずに、設定した回転数を維持して次回の圧延を
実施する。The rolling control computer 13 compares the modified meat thickness value t S and thickness target value t which is input from the production managing computer 12 0 determined (S7), the correction meat thickness value t S When it is different from the wall thickness target value t 0 , the rotation speed of the rolling roll 6 is changed so as to reduce the difference (S8), and the next rolling is performed at the changed roll rotation speed. If the corrected thickness t S is the same as the target thickness t 0 , the next rolling is carried out while maintaining the set rotation speed without changing the rotation speed of the rolling roll 6.
【００１９】このようにして継目無鋼管３を圧延するこ
とで、正確に継目無鋼管３の肉厚制御を行うことが可能
となり、肉厚目標値ｔ0 に近い継目無鋼管３を安定して
製造することが可能となる。By rolling the seamless steel pipe 3 in this manner, it is possible to accurately control the thickness of the seamless steel pipe 3 and stably produce the seamless steel pipe 3 close to the target thickness t 0. It can be manufactured.
【００２０】[0020]
【実施例】図１に示す構成の継目無鋼管製造装置を用
い、本発明を用いて、製品外径が６０．５ｍｍで、肉厚
目標値ｔ0 が３．９０ｍｍの継目無鋼管を製造した。そ
の時の肉厚目標値ｔ0 と実測値との偏差（％）に対する
度数（本数）分布の調査結果を図４に示す。又、比較の
ため、その他の条件を同一として、熱間放射線厚み計に
よる肉厚測定値ｔを修正しないままフィードバックする
従来法により製造し（従来例）、その時の肉厚目標値ｔ
0 と実測値との偏差（％）に対する度数（本数）分布の
調査結果を図５に合せて示す。これらの図で明らかなよ
うに、肉厚目標値ｔ0 と実測値との偏差の平均値及び分
散（σ）は、共に本発明の実施例の方が小さく、肉厚の
寸法精度が良いことが分かる。EXAMPLES Using seamless steel pipes manufacturing apparatus shown in FIG. 1, using the present invention, the product outside diameter at 60.5 mm, wall thickness target value t 0 is to produce a seamless steel pipe 3.90mm . FIG. 4 shows a survey result of the frequency (number) distribution with respect to the deviation (%) between the wall thickness target value t 0 and the actually measured value at that time. For comparison, the other conditions are the same, and the thickness measurement value t by the hot-radiation thickness gauge is manufactured by the conventional method of feeding back without correction (conventional example).
FIG. 5 also shows the results of a survey of the frequency (number) distribution with respect to the deviation (%) between 0 and the actually measured value. As is apparent from these figures, the average value and the variance (σ) of the deviation between the target thickness value t 0 and the actual measurement value are both smaller in the embodiment of the present invention, and the dimensional accuracy of the thickness is better. I understand.
【００２１】[0021]
【発明の効果】本発明では、熱間放射線厚み計による測
定値を、鋼片段階の実貫重量と継目無鋼管の肉厚測定値
及び長さ測定値から算出される計算重量とを用いて修正
し、修正した肉厚値に基づき継目無鋼管の肉厚を制御す
るので、正確に継目無鋼管の肉厚制御を行うことが可能
となり、肉厚目標値に近い継目無鋼管を安定して製造す
ることが可能となる。その結果、肉厚不良による製品不
良率を大幅に低減することができ、工業上有益な効果が
もたらされる。According to the present invention, the measured value by the hot radiation thickness gauge is used by using the actual weight at the billet stage and the calculated weight calculated from the measured thickness and the measured length of the seamless steel pipe. Since the wall thickness of the seamless steel pipe is controlled based on the corrected wall thickness value, it is possible to accurately control the wall thickness of the seamless steel pipe, and to stabilize the seamless steel pipe close to the wall thickness target value. It can be manufactured. As a result, the product failure rate due to the wall thickness failure can be significantly reduced, and an industrially beneficial effect is brought about.
【図１】本発明の実施の形態例を示す図であって、継目
無鋼管の製造装置の概略構成図である。FIG. 1 is a view showing an embodiment of the present invention, and is a schematic configuration diagram of an apparatus for manufacturing a seamless steel pipe.
【図２】本発明に係る継目無鋼管の製造方法を示すフロ
ーチャートである。FIG. 2 is a flowchart showing a method for manufacturing a seamless steel pipe according to the present invention.
【図３】継目無鋼管の修正前後の肉厚分布を示す図であ
る。FIG. 3 is a diagram showing a wall thickness distribution of a seamless steel pipe before and after correction.
【図４】本発明の実施例における肉厚目標値と実測値と
の偏差に対する度数分布の調査結果を示す図である。FIG. 4 is a diagram showing a result of an investigation of a frequency distribution with respect to a deviation between a wall thickness target value and an actually measured value in the example of the present invention.
【図５】従来例における肉厚目標値と実測値との偏差に
対する度数分布の調査結果を示す図である。FIG. 5 is a diagram showing a result of a survey of a frequency distribution with respect to a deviation between a wall thickness target value and an actually measured value in a conventional example.
【図６】放射線厚み計による継目無鋼管の肉厚測定方法
の概要を示す図である。FIG. 6 is a diagram showing an outline of a method for measuring the thickness of a seamless steel pipe using a radiation thickness gauge.
１ 鋼片 ２ 継目無素管 ３ 継目無鋼管 ４ 秤量機 ５ ストレッチレデューサー ６ 圧延ロール ７ モーター ８ モーター制御装置 ９ 熱間放射線厚み計 １０ 熱間測長計 １１ 検出用カメラ １２ 生産管理用計算機 １３ 圧延制御用計算機 DESCRIPTION OF SYMBOLS 1 Billet 2 Seamless pipe 3 Seamless steel pipe 4 Weighing machine 5 Stretch reducer 6 Rolling roll 7 Motor 8 Motor control device 9 Hot radiation thickness gauge 10 Hot measuring gauge 11 Camera for production 12 Computer for production control 13 Rolling control Computer
Claims (1)
肉厚を放射線厚み計により全長に渡って測定すると共に
継目無鋼管の長さを測定し、得られた肉厚測定値ｔ及び
長さ測定値Ｌと圧延ロールのロールバイト径とを用いて
継目無鋼管の計算重量Ｗ1 を求め、前記肉厚測定値ｔ
と、求めた計算重量Ｗ1 と、この継目無鋼管の圧延前の
鋼片段階で予め測定した実貫重量Ｗ0 とを用いて（１）
式により継目無鋼管の肉厚を修正し、修正して得られた
修正肉厚値ｔS と肉厚目標値ｔ0とを比較して、修正肉
厚値ｔS と肉厚目標値ｔ0 との差が小さくなるように、
その差に基づき圧延ロールの回転数を制御することを特
徴とする継目無鋼管の製造方法。 ｔS＝ｔ×［１＋（Ｗ0−Ｗ1）／Ｗ0］……（１）1. The thickness of a seamless steel pipe rolled by a rolling roll is measured over the entire length by a radiation thickness gauge, and the length of the seamless steel pipe is measured. The calculated weight W 1 of the seamless steel pipe is obtained using the value L and the roll bite diameter of the rolling roll, and the thickness measurement value t is obtained.
Using the calculated weight W 1 and the actual weight W 0 measured in advance in the billet stage before rolling the seamless steel pipe (1).
Correct the thickness of the seamless steel pipe by the formula, by comparing the modified meat thickness value t S and the thickness target value t 0 obtained by correcting, modifying meat thickness value t S and the thickness target value t 0 So that the difference between
A method for manufacturing a seamless steel pipe, wherein the number of rotations of a rolling roll is controlled based on the difference. t S = t × [1+ (W 0 −W 1 ) / W 0 ] (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16257699A JP4288757B2 (en) | 1999-06-09 | 1999-06-09 | Seamless steel pipe manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16257699A JP4288757B2 (en) | 1999-06-09 | 1999-06-09 | Seamless steel pipe manufacturing method |
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|---|---|
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| JP4288757B2 JP4288757B2 (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16257699A Expired - Lifetime JP4288757B2 (en) | 1999-06-09 | 1999-06-09 | Seamless steel pipe manufacturing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980518A (en) * | 2012-11-23 | 2013-03-20 | 中冶辽宁德龙钢管有限公司 | Intelligent length-measuring and weighing device and data management method |
| CN112823064A (en) * | 2018-10-11 | 2021-05-18 | Sms集团有限公司 | Wall thickness control during pipe tension reducing |
-
1999
- 1999-06-09 JP JP16257699A patent/JP4288757B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980518A (en) * | 2012-11-23 | 2013-03-20 | 中冶辽宁德龙钢管有限公司 | Intelligent length-measuring and weighing device and data management method |
| CN112823064A (en) * | 2018-10-11 | 2021-05-18 | Sms集团有限公司 | Wall thickness control during pipe tension reducing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4288757B2 (en) | 2009-07-01 |
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