EP0272204B1 - Procédé de réglage d'épaisseur de paroi de tube - Google Patents

Procédé de réglage d'épaisseur de paroi de tube Download PDF

Info

Publication number
EP0272204B1
EP0272204B1 EP87730165A EP87730165A EP0272204B1 EP 0272204 B1 EP0272204 B1 EP 0272204B1 EP 87730165 A EP87730165 A EP 87730165A EP 87730165 A EP87730165 A EP 87730165A EP 0272204 B1 EP0272204 B1 EP 0272204B1
Authority
EP
European Patent Office
Prior art keywords
wall thickness
pipe
measured
values
rolling 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.)
Expired - Lifetime
Application number
EP87730165A
Other languages
German (de)
English (en)
Other versions
EP0272204A2 (fr
EP0272204A3 (en
Inventor
Hans Joachim Dr.-Ing. Pehle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0272204A2 publication Critical patent/EP0272204A2/fr
Publication of EP0272204A3 publication Critical patent/EP0272204A3/de
Application granted granted Critical
Publication of EP0272204B1 publication Critical patent/EP0272204B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills

Definitions

  • the invention relates to a method for controlling the tube wall thickness in a multi-stand continuous stretch-reducing rolling mill with devices for measuring the tube wall thickness before the forming and the inlet speed of the pipe, a computer unit for measured value processing and a device for speed control of the drive motors of the rolling mill.
  • the stretching of the rolling stock and thus its wall thickness is specifically influenced by the setting of the ratios of the roll speeds from stand to stand.
  • the wall thickness of the pipes entering the rolling mill there are also wall thickness differences in the formed pipes if the speed ratios are unchanged during the forming.
  • suitable devices for speed control by varying the wall thickness of the incoming tube and correspondingly adjusting and changing the roller speed ratios, it is possible to compensate to a certain extent for different wall thicknesses both from tube to tube and within a tube.
  • Such a device and a method according to the preamble of claim 1 is known, for example, from Sloma, J., Automatic control of the tube wall thickness on a multi-stand stretch-reducing mill, from "Problems of Project Planning", 1973, No. 8, pages 352-356. It is used to measure the wall thickness of the pipe entering the rolling mill, depending on the length, from this the target stretches and target speed ratios are determined and a corresponding speed change is carried out at the point in time at which the cross-sections of the rolling stock assigned to the measurement data are in the area of the rolling mill intended to influence the wall thickness.
  • This control device makes it possible to compensate for small wall thickness differences over pipe length sections, which roughly correspond in volume to the sections of the rolling stock located simultaneously in the area of influence of the rolling mill. If, however, larger wall thickness differences occur at shorter intervals, the control device mentioned inevitably reforms individual pipe sections with an excessive elongation and, as a result, impermissibly high wall thickness reductions occur with regard to the finished pipe tolerances. This is due to the fact that the speeds cannot be pressed continuously.
  • the invention has for its object to compensate for changing tube wall thicknesses in short lengths of rolling stock, in such a way that each rolling stock cross-section is reshaped with maximum, but not greater than the stretching or wall thickness reduction necessary to achieve a desired finished tube wall thickness.
  • the control law is influenced in accordance with the deviation between the setpoint value of the finished pipe wall thickness and the minimum value of the wall thickness values, which are measured after the forming, and are each to be assigned to a pipe length section which has the same volume as the section of the rolling stock located in the wall thickness influence area of the rolling mill is.
  • control law for determining the drive speeds from the measured values of the wall thicknesses of the pipe before the forming is corrected independently of the pilot control or by means of a control circuit.
  • Such an adaptation can be carried out within a tube as well as from tube to tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (3)

  1. Procédé de réglage d'épaisseur de paroi de tube dans un train de laminoir étireur-réducteur continu à cages multiples, comprenant des systèmes pour mesurer l'épaisseur de paroi du tube, une unité d'ordinateur pour le traitement des valeurs mesurées, et un système de réglage de la vitesse de rotation des moteurs d'entraînement du train de laminoir, l'épaisseur de paroi du tube étant mesurée en continu avant son entrée dans le train de laminoir et, en outre, le mouvement de défilement des points de mesure affectés aux valeurs mesurées étant déterminé au moyen d'une mesure de la vitesse, caractérisé en ce qu'un lissage de données des valeurs mesurées est effectué, par exemple, par la formation de moyennes de valeurs voisines, et en ce que les rapports des vitesses de rotation des cylindres d'une cage de laminoir à l'autre sont réglés en continu, selon une loi de réglage en fonction de cette valeur lissée et par rapport à la zone de tube mesurée se trouvant respectivement dans la zone d'influence du train de laminoir, avec le plus petit étirage nécessaire à l'obtention de l'épaisseur de paroi souhaitée de tube fini.
  2. Procédé conforme à la revendication 1, caractérisé en ce que les valeurs d'épaisseur de paroi mesurées avant le formage sont approchées au moyen de fonctions mathématiques à valeur générale pour des portions de longueur déterminées.
  3. Procédé conforme à la revendication 1 ou 2, comprenant un système de mesure de l'épaisseur de paroi de tube après le formage, caractérisé en ce que la loi de réglage est influencée selon l'écart entre la valeur de consigne de l'épaisseur de paroi du tube fini et la valeur minimale des valeurs d'épaisseur de paroi qui sont mesurées après le formage et affectées respectivement à une portion de longueur de tube qui est égale, en volume, à la portion de produit laminé se trouvant dans la zone d'influence d'épaisseur de paroi du train de laminoir.
EP87730165A 1986-12-18 1987-12-15 Procédé de réglage d'épaisseur de paroi de tube Expired - Lifetime EP0272204B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643659 DE3643659A1 (de) 1986-12-18 1986-12-18 Verfahren zur steuerung der rohrwanddicke
DE3643659 1986-12-18

Publications (3)

Publication Number Publication Date
EP0272204A2 EP0272204A2 (fr) 1988-06-22
EP0272204A3 EP0272204A3 (en) 1988-11-09
EP0272204B1 true EP0272204B1 (fr) 1992-07-15

Family

ID=6316703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87730165A Expired - Lifetime EP0272204B1 (fr) 1986-12-18 1987-12-15 Procédé de réglage d'épaisseur de paroi de tube

Country Status (2)

Country Link
EP (1) EP0272204B1 (fr)
DE (2) DE3643659A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10201717C1 (de) * 2002-01-18 2003-04-10 Sms Meer Gmbh Verfahren und Vorrichtung zum Walzen eines Rohres
DE102017211481A1 (de) 2017-07-05 2019-01-10 Sms Group Gmbh Vorrichtung zur Steuerung eines Streckreduzierwalzwerks
DE102017220750A1 (de) 2017-11-21 2019-05-23 Sms Group Gmbh Vorrichtung zur Steuerung eines Streckreduzierwalzwerks
DE102018217378B3 (de) * 2018-10-11 2020-03-26 Sms Group Gmbh Wanddickenkontrolle beim Streckreduzieren von Rohren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1427922C3 (de) * 1965-04-07 1975-08-14 Fa. Friedrich Kocks, 4000 Duesseldorf Verstelleinrichtung zum Regeln des Gesamtstreckgrades beim Streckreduzieren von Rohren
GB1158754A (en) * 1967-03-21 1969-07-16 Kocks Wermelskirchen Gmbh Process for Stretch-Reducing Tubes
US3496745A (en) * 1967-05-01 1970-02-24 Kocks Gmbh Friedrich Process for stretch-reducing tubes
US3564882A (en) * 1968-04-22 1971-02-23 Allegheny Ludlum Steel Rolling mill control system
DE2947233C2 (de) * 1979-11-23 1992-03-12 Kocks Technik Gmbh & Co, 4010 Hilden Vorrichtung zur Steuerung der Wanddicke von Rohren
JPS60199514A (ja) * 1984-03-22 1985-10-09 Sumitomo Metal Ind Ltd 管の絞り圧延方法

Also Published As

Publication number Publication date
DE3643659C2 (fr) 1990-05-17
EP0272204A2 (fr) 1988-06-22
DE3780429D1 (de) 1992-08-20
DE3643659A1 (de) 1988-07-07
EP0272204A3 (en) 1988-11-09

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