EP1109634B1 - Method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill - Google Patents
Method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill Download PDFInfo
- Publication number
- EP1109634B1 EP1109634B1 EP99936250A EP99936250A EP1109634B1 EP 1109634 B1 EP1109634 B1 EP 1109634B1 EP 99936250 A EP99936250 A EP 99936250A EP 99936250 A EP99936250 A EP 99936250A EP 1109634 B1 EP1109634 B1 EP 1109634B1
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- EP
- European Patent Office
- Prior art keywords
- pipe
- reducing mill
- rolling
- steady
- state
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005096 rolling process Methods 0.000 title claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000002123 temporal effect Effects 0.000 claims 1
- 230000008719 thickening Effects 0.000 description 5
- 238000004904 shortening Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/78—Control of tube rolling
-
- 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 minimizing thickened ends during rolling of pipes in a stretch-reducing mill by changing the time Torque of individual driven roll stands when passing through the Pipe beginning or the end of the pipe through the stretch-reducing mill, so that the Pipe ends with larger than the stationary ratios of the roll speed be rolled.
- the difference is a measure of the size of the increase in wall thickness at the pipe ends between those acting in the stationary and those in the transient state
- Tensile stresses in every single forming step, i.e. in every scaffold. by virtue of the development of the wall thickness differs in different processes the - in the rolling direction - the front and the rear pipe section; she exist essentially in the wall thickness, the wall thickness profile and the length of the area with increased wall thickness.
- the thickened pipe ends outside the tolerance are cut off means committee that can significantly reduce productivity. So it had to Methods are developed with which the formation of the thickened pipe ends could be prevented or at least minimized so that the end losses so stayed as small as possible.
- the object of the present invention is the effect of the known Pipe end control increase and localize to thicken the occurrence To further minimize or prevent pipe ends.
- an improvement of the known is inventively Proposed method, which is characterized in that between the stationary and increased speed ratios smaller than the stationary Speed ratios can be set.
- the proposal of the invention due to the reduced speed ratios compared to the stationary rolling condition a targeted wall thickening is set, i.e. on the one hand it becomes the Tension increase localized and better at the area of wall thickening adjusted and on the other hand a possible impermissible wall thinning in the area balanced between the thickened pipe end and the good pipe.
- Speed change method according to the invention can be impermissible Wall thinning avoided and thus even higher speed ratios can be set so that a shortening of the thickened ends can be achieved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Minimierung verdickter Enden beim Walzen von Rohren in einem Streckreduzierwalzwerk durch eine zeitliche Änderung des Drehmomentes einzelner angetriebener Walzgerüste beim Durchlauf des Rohranfanges bzw. des Rohrendes durch das Streckreduzierwalzwerk, so daß die Rohrenden mit größeren als den stationären Verhältnissen der Walzendrehzahl gewalzt werden.The invention relates to a method for minimizing thickened ends during rolling of pipes in a stretch-reducing mill by changing the time Torque of individual driven roll stands when passing through the Pipe beginning or the end of the pipe through the stretch-reducing mill, so that the Pipe ends with larger than the stationary ratios of the roll speed be rolled.
Die hohen Längszugspannungen beim Streckreduzieren von Rohren verstärken das Auftreten sogenannter "verdickter Enden", mit denen man die infolge verminderter wirksamer Streckung an den Rohrenden auftretenden Bereiche bezeichnet. Die Ursache für die gegenüber dem Rohrmittelteil geringere Streckung der Rohrenden besteht darin, daß die für den stationären-Betriebszustand ausgelegten Walzendrehzahlverhältnisse im allgemeinen nicht groß genug sind, um physikalisch maximale Zugspannungen an den Rohrenden aufzubauen. Die Rohrenden weisen gegenüber dem stationär gewalzten Rohrmittelteil eine größere, zum Rohrende hin zunehmende Wanddicke auf. Wenn diese Wanddicke die zulässige Toleranzgrenze überschreitet, müssen diese Endabschnitte vom Fertigrohr geschopft werden.The high longitudinal tensile stresses when reducing the stretch of pipes reinforce this Occurrence of so-called "thickened ends", with which one reduces those as a result of effective extension at the pipe ends. The Cause of the less stretching of the pipe ends compared to the pipe middle part is that those designed for steady-state operation Roller speed ratios are generally not large enough to be physical build up maximum tensile stresses at the pipe ends. The pipe ends point compared to the stationary rolled pipe middle part, a larger one towards the pipe end increasing wall thickness. If this wall thickness is the permissible tolerance limit exceeds these end sections must be scooped from the finished pipe.
Ein Maß für die Größe der Wanddickenzunahme an den Rohrenden ist die Differenz zwischen den im stationären und den im instationären Zustand wirkenden Zugspannungen in jedem einzelnen Umformschritt, d.h. in jedem Gerüst. Aufgrund unterschiedlicher Entstehungsvorgänge unterscheiden sich die Wanddickenverläufe an dem - in Walzrichtung gesehen - vorderen und dem hinteren Rohrabschnitt; sie bestehen im wesentlichen in der Wanddicke, dem Wanddickenverlauf und der Länge des Bereichs mit erhöhter Wanddicke. The difference is a measure of the size of the increase in wall thickness at the pipe ends between those acting in the stationary and those in the transient state Tensile stresses in every single forming step, i.e. in every scaffold. by virtue of the development of the wall thickness differs in different processes the - in the rolling direction - the front and the rear pipe section; she exist essentially in the wall thickness, the wall thickness profile and the length of the area with increased wall thickness.
Die verdickten, außerhalb der Toleranz liegenden Rohrenden werden abgetrennt, das bedeutet Ausschuß, der die Produktivität deutlich senken kann. Es mußten deshalb Methoden erarbeitet werden, mit denen das Entstehen der verdickten Rohrenden verhindert oder wenigstens so minimiert werden konnten, dass die Endenverluste so klein wie möglich blieben.The thickened pipe ends outside the tolerance are cut off means committee that can significantly reduce productivity. So it had to Methods are developed with which the formation of the thickened pipe ends could be prevented or at least minimized so that the end losses so stayed as small as possible.
Es hat sich gezeigt, dass Endenverluste klein gehalten werden können, wenn durch gezielte Änderungen der Antriebsmotordrehzahlen des Streckreduzierwalzwerkes an den Rohrenden Spannungs- und Formänderungszustände eingestellt werden, die nah an den stationären Umformbedingungen liegen. Wenn in der Ein- und Auslaufphase des Walzprozesses die auf die Rohrenden wirkende Zugspannung durch Erhöhung der Drehzahlverhältnisse erhöht und so der Vergrößerung der Wanddicke über das Toleranzmaß hinaus entgegengewirkt wird, so können die durch Endenverdickungen bedingten Materialverluste vermindert werden. Die Zugspannungsvorläufe werden in bekannten Rohrendensteuerungen so berechnet, daß eine maximal mögliche Zugspannung ermittelt wird, wobei darauf zu achten ist, daß ein noch nicht verdickter Rohrabschnitt nicht unter höheren als den stationären Zugspannungen beaufschlagt wird, weil sonst am Fertigrohr die unter stationären Umformbedingungen erzeugten Rohrwanddicken unterschritten werden können.It has been shown that end losses can be kept small when through targeted changes to the drive motor speeds of the stretch-reducing mill the pipe ends stress and strain states that are close are due to the stationary forming conditions. If in the run-in and run-out phase of the rolling process, the tensile stress acting on the pipe ends by increasing the speed ratios increased and so the increase in wall thickness over the Tolerance measure is counteracted, so the end thickening contingent material losses can be reduced. The tension preloads are in known pipe end controls calculated so that a maximum possible Tension is determined, taking care that a not yet thickened Pipe section not subjected to higher than the stationary tensile stresses is, because otherwise the finished tube generated under stationary forming conditions Pipe wall thicknesses can be fallen below.
Um eine Drehzahländerung durchführen zu können, ist allerdings ein schnelles,
hinsichtlich der Walzendrehzahl individuell regelbares Antriebssystem erforderlich. Als
Antrieb kommen sowohl Gruppenüberlagerungsantriebe mit geeigneter
Gruppenaufteilung als auch Einzelantriebe in Frage.
Verfahren zur lokalen Beeinflussung der Wanddicke mittels Drehzahlveränderungen
sind aus den DE 44 46 659 C1 und DE-OS-1652543 bekannt.
Bei den bekannten Verfahren wird speziell am vorderen Rohrende, das verglichen mit
dem hinteren Rohrende kurz ist, eine nur geringe Verkürzung der verdickten Enden
erzielt; denn die Erhöhung der Drehzahlverhältnisse ist durch die auftretende
unzulässige Wandverdünnungen zwischen dem Gutrohrbereich und den verdickten
Enden begrenzt. Eine engere Lokalisierung der Zugspannungserhöhung durch eine
geringere Anzahl der an der Drehzahlerhöhung beteiligten Gerüste wäre notwendig,
zumal eine effektive Beeinflußung der Endverdickung während der Einlaufphasen nur
in einer begrenzten Anzahl einlaufseitig angeordneter Gerüste möglich ist. Mit den
bekannten Drehzahländerungsverfahren ist aber eine Reduzierung der beteiligten
Gerüste nicht möglich, weil mit kleineren Gerüstanzahlen weniger Zugspannung
aufgebracht werden kann.In order to be able to change the speed, however, a fast drive system that can be individually regulated with regard to the roller speed is required. Both group overlay drives with suitable group distribution and individual drives can be considered as drives.
Methods for locally influencing the wall thickness by means of speed changes are known from DE 44 46 659 C1 and DE-OS-1652543.
In the known methods, especially at the front tube end, which is short compared to the rear tube end, the thickened ends are only slightly shortened; because the increase in the speed ratio is limited by the impermissible wall thinning that occurs between the pipe section and the thickened ends. A closer localization of the tension increase by a smaller number of the stands involved in the speed increase would be necessary, especially since an effective influencing of the final thickening during the running-in phases is only possible in a limited number of stands arranged on the entry side. With the known speed change methods, however, it is not possible to reduce the scaffolding involved, because with smaller numbers of scaffolding less tensile stress can be applied.
Aufgabe der vorliegenden Erfindung ist es, den Effekt der bekannten Rohrendensteuerung zu erhöhen und zu lokalisieren, um das Auftreten verdickter Rohrenden weiter zu minimieren oder zu verhindern.The object of the present invention is the effect of the known Pipe end control increase and localize to thicken the occurrence To further minimize or prevent pipe ends.
Zur Lösung der Aufgabe wird erfindungsgemäß eine Verbesserung des bekannten Verfahrens vorgeschlagen, das dadurch gekennzeichnet ist, daß zwischen den stationären und erhöhten Drehzahlverhältnissen kleinere als die stationären Drehzahlverhältnisse eingestellt werden. Durch den Vorschlag der Erfindung wird durch die gegenüber dem stationären Walzzustand verringerten Drehzahlverhältnisse eine gezielte Wandverdickung eingestellt, d.h. es wird einerseits die Zugspannungserhöhung lokalisiert und besser an den Bereich der Wandverdickung angepaßt und andererseits eine mögliche unzulässige Wandverdünnung im Bereich zwischen verdicktem Rohrende und Gutrohr wieder ausgeglichen. Mit Hilfe der erfindungsgemäßen Drehzahländerungsmethode können unzulässige Wandverdünnungen vermieden und damit noch größere Drehzahlverhältnisse eingestellt werden, so daß sich eine Verkürzung der verdickten Enden erreichen läßt.To achieve the object, an improvement of the known is inventively Proposed method, which is characterized in that between the stationary and increased speed ratios smaller than the stationary Speed ratios can be set. The proposal of the invention due to the reduced speed ratios compared to the stationary rolling condition a targeted wall thickening is set, i.e. on the one hand it becomes the Tension increase localized and better at the area of wall thickening adjusted and on the other hand a possible impermissible wall thinning in the area balanced between the thickened pipe end and the good pipe. With the help of Speed change method according to the invention can be impermissible Wall thinning avoided and thus even higher speed ratios can be set so that a shortening of the thickened ends can be achieved.
Obwohl das erfindunggemäße Verfahren sowohl bei Gruppenüberlagerungsantrieben als auch bei Einzelantrieben anwendbar ist, besteht ein besonderer Vorteil darin, daß der Nachteil des Elektroeinzelantriebes, am vorderen Rohrende wegen Drehzahleinbruchs infolge Stoßbelastung einen erhöhten Endenverlust hervorzurufen, durch die neue Drehzahlsteuerungsmethode mit relativ einfachen Mitteln vermieden werden kann.Although the method according to the invention applies to both group superposition drives is also applicable to individual drives, there is a particular advantage that the disadvantage of the electric single drive, because of the front pipe end Drop in speed due to shock load to cause an increased loss of ends, avoided by the new speed control method with relatively simple means can be.
Die Erfindung wird anhand von drei Diagrammen grafisch dargestellt und erläutert. Es zeigt:
- Figur 1
- den Walzendrehzahlverlauf über der Rohrlänge,
- Figur 2
- den Zugspannungsverlauf über der Rohrlänge, und
- Figur 3
- den Verlauf der Rohrwanddicke im Übergangsbereich zwischen Gutrohr und verdicktem Ende.
- Figure 1
- the roll speed curve over the pipe length,
- Figure 2
- the tension curve over the pipe length, and
- Figure 3
- the course of the pipe wall thickness in the transition area between the good pipe and the thickened end.
In allen drei Zeichnungsfiguren wird der Kurvenverlauf des Standes der Technik gestrichelt dargestellt, der der Erfindung ist in durchgezogener Linie gezeichnet. Der stationäre Zustand des Streckreduzierwalzwerkes ist gepunktet dargestellt.The curve of the prior art is shown in all three drawing figures shown in dashed lines, the invention is drawn in a solid line. The The steady state of the stretch-reducing mill is shown in dotted lines.
In der Figur 1 ist zu erkennen, daß die Walzendrehzahlen des stationären Zustandes vereinfacht einer linear ansteigenden Geraden folgen und daß beim Einlaufen des Rohrendes die Drehzahlverhältnisse n1 erhöht werden. Gleichzeitig lokalisiert sich die Zugspannungserhöhung z1 in Figur 2 durch eine geringere Anzahl der an der Drehzahlerhöhung beteiligten Gerüste, woraus sich der Wanddickenverlauf ergibt, der in Figur 3 gestrichelt dargestellt ist. Erkennbar ist, daß im Bereich zwischen den verdickten Enden (rechts in Figur 3) und dem Bereich des Gutrohres (links in Figur 3) ein Rohrabschnitt entsteht, bei dem der Wanddickenverlauf unterhalb der Toleranzgrenze zu erkennen ist.In Figure 1 it can be seen that the roller speeds of the steady state simplified to follow a linearly rising straight line and that when the Speed ratios n1 can be increased. At the same time, the Tension increase z1 in Figure 2 by a smaller number of at the Speed increase involved scaffolding, which results in the wall thickness curve, the is shown in dashed lines in Figure 3. It can be seen that in the area between the thickened ends (on the right in FIG. 3) and the area of the pipe (on the left in FIG. 3) a pipe section is created in which the wall thickness curve below the Tolerance limit can be seen.
Stellt man nun erfindungsgemäß zwischen den erhöhten Drehzahlverhältnissen und den stationären Drehzahlverhältnissen kleinere als die stationären Drehzahlverhältnisse ein, wie dies in der Zeichnungsfigur 1 mit der durchgezogenen Linie dargestellt ist, so wird einerseits die Zugspannungserhöhung lokalisiert, wie bei z2 in Figur 2 zu erkennen ist, und diese damit besser an den Bereich der Wandverdickung angepaßt. Gleichzeitig wird, wie die durchgezogene Kurve in Figur 3 zeigt, eine möglicherweise unzulässige Wandverdünnung im Bereich zwischen dem verdickten Rohrende und dem Gutrohr wieder ausgeglichen, so daß unzulässige Wandverdünnungen vermieden werden. Auf diese Weise können noch größere Drehzahlverhältnisse eingestellt werden, woraus sich eine Verkürzung der verdickten Rohrenden ergibt, wie in Figur 3 mit der Länge I1 und der Länge I2 sichtbar gemacht wurde, wobei I2 < I1 ist.According to the invention, one now places between the increased speed ratios and the stationary speed ratios smaller than the stationary ones Speed ratios, as in the figure 1 with the solid Line is shown, on the one hand the increase in tension is localized, as in z2 can be seen in Figure 2, and thus better at the area of Adjusted wall thickening. At the same time, like the solid curve in FIG. 3 shows a possibly impermissible wall thinning in the area between the thickened pipe end and the good pipe balanced again, so that impermissible Wall thinning can be avoided. This way even bigger ones can be Speed ratios are set, resulting in a shortening of the thickened Pipe ends, as shown in Figure 3 with the length I1 and the length I2 visible where I2 <I1.
Claims (1)
- Method for minimising thickened ends during the rolling of pipes in a stretch reducing mill by means of a temporal change of the torque of individually actuated roller stands during passage of the start of the pipe or of the end of the pipe through the stretch reducing mill, so that the pipe ends are rolled at ratios of the roller speeds which are greater than the steady-state ratios,
characterised in that,
between the steady-state and the increased speed ratios, smaller speed ratios are set than the steady-state speed ratios.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19840864A DE19840864C1 (en) | 1998-08-31 | 1998-08-31 | Method for reducing the length of thickened ends when rolling pipes in a stretch reduction rolling mill |
| DE19840864 | 1998-08-31 | ||
| PCT/DE1999/001459 WO2000012237A1 (en) | 1998-08-31 | 1999-05-11 | Method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1109634A1 EP1109634A1 (en) | 2001-06-27 |
| EP1109634B1 true EP1109634B1 (en) | 2002-11-27 |
Family
ID=7880141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99936250A Expired - Lifetime EP1109634B1 (en) | 1998-08-31 | 1999-05-11 | Method for minimizing thickened ends during the rolling of pipes in a stretch reducing mill |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US6526792B1 (en) |
| EP (1) | EP1109634B1 (en) |
| JP (1) | JP3794923B2 (en) |
| CN (1) | CN1144630C (en) |
| AT (1) | ATE228400T1 (en) |
| AU (1) | AU5147599A (en) |
| CZ (1) | CZ300083B6 (en) |
| DE (1) | DE19840864C1 (en) |
| ES (1) | ES2183589T3 (en) |
| RU (1) | RU2224607C2 (en) |
| UA (1) | UA67792C2 (en) |
| WO (1) | WO2000012237A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10332221A1 (en) * | 2003-07-16 | 2005-02-17 | Benteler Stahl/Rohr Gmbh | Minimizing thickened ends during rolling of metallic rolled products in stretch reducing mill comprises heating end sections of rolled products to higher temperature than average rolling temperature |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455369C (en) * | 2005-06-30 | 2009-01-28 | 宝山钢铁股份有限公司 | Feed forward control method for wall thickness of tension reducing machine |
| DE102017220750A1 (en) | 2017-11-21 | 2019-05-23 | Sms Group Gmbh | Device for controlling a draft-reducing mill |
| CN108555033B (en) * | 2018-04-09 | 2019-11-12 | 北京科技大学 | Steel pipe thickens the control method of segment length minimization when a kind of stretch-reducing mill rolls |
| CN109047335A (en) * | 2018-06-11 | 2018-12-21 | 黑龙江建龙化工有限公司 | Steel pipe sizes outer diameter control method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1652543A1 (en) * | 1968-03-02 | 1972-02-03 | Demag Ag | Stretch-reducing mill |
| US4002048A (en) * | 1975-12-19 | 1977-01-11 | Aetna-Standard Engineering Company | Method of stretch reducing of tubular stock |
| DE3028211C2 (en) * | 1980-07-25 | 1986-10-16 | Kocks Technik Gmbh & Co, 4010 Hilden | Rolling mill for reducing the stretching of tubes |
| DE3601693A1 (en) * | 1986-01-17 | 1987-07-23 | Mannesmann Ag | ROLLING MILL FOR TUBE REDUCTION |
| US4984444A (en) * | 1989-04-26 | 1991-01-15 | Franceschina Louis E | Method of reducing tubular products |
| IT1237199B (en) * | 1989-11-17 | 1993-05-26 | Ettore Cernuschi | STEEL REDUCER REDUCER FOR PIPES. |
| RU2015755C1 (en) * | 1991-05-23 | 1994-07-15 | Всероссийский научно-исследовательский, проектно-конструкторский и технологический институт кабельной промышленности | Method for cold reduction in cross-sectional area of welded pipe products |
| JP3316979B2 (en) * | 1992-11-30 | 2002-08-19 | 住友金属工業株式会社 | Pipe rolling method and apparatus used for its implementation |
| DE4446659C1 (en) * | 1994-12-16 | 1996-07-25 | Mannesmann Ag | Working method for producing pipe in drawing roller |
-
1998
- 1998-08-31 DE DE19840864A patent/DE19840864C1/en not_active Expired - Lifetime
-
1999
- 1999-05-11 ES ES99936250T patent/ES2183589T3/en not_active Expired - Lifetime
- 1999-05-11 RU RU2001108551/02A patent/RU2224607C2/en active
- 1999-05-11 CZ CZ20010754A patent/CZ300083B6/en not_active IP Right Cessation
- 1999-05-11 WO PCT/DE1999/001459 patent/WO2000012237A1/en active IP Right Grant
- 1999-05-11 AU AU51475/99A patent/AU5147599A/en not_active Abandoned
- 1999-05-11 JP JP2000567324A patent/JP3794923B2/en not_active Expired - Lifetime
- 1999-05-11 EP EP99936250A patent/EP1109634B1/en not_active Expired - Lifetime
- 1999-05-11 AT AT99936250T patent/ATE228400T1/en active
- 1999-05-11 US US09/786,035 patent/US6526792B1/en not_active Expired - Lifetime
- 1999-05-11 CN CNB998104337A patent/CN1144630C/en not_active Expired - Lifetime
- 1999-11-05 UA UA2001021380A patent/UA67792C2/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10332221A1 (en) * | 2003-07-16 | 2005-02-17 | Benteler Stahl/Rohr Gmbh | Minimizing thickened ends during rolling of metallic rolled products in stretch reducing mill comprises heating end sections of rolled products to higher temperature than average rolling temperature |
| DE10332221B4 (en) * | 2003-07-16 | 2006-05-11 | Benteler Stahl/Rohr Gmbh | Method for minimizing thickened ends during rolling of rolled products |
Also Published As
| Publication number | Publication date |
|---|---|
| CZ2001754A3 (en) | 2001-09-12 |
| RU2224607C2 (en) | 2004-02-27 |
| UA67792C2 (en) | 2004-07-15 |
| EP1109634A1 (en) | 2001-06-27 |
| DE19840864C1 (en) | 1999-07-29 |
| ATE228400T1 (en) | 2002-12-15 |
| ES2183589T3 (en) | 2003-03-16 |
| CN1144630C (en) | 2004-04-07 |
| US6526792B1 (en) | 2003-03-04 |
| CN1315887A (en) | 2001-10-03 |
| WO2000012237A1 (en) | 2000-03-09 |
| AU5147599A (en) | 2000-03-21 |
| CZ300083B6 (en) | 2009-01-28 |
| JP2002523243A (en) | 2002-07-30 |
| JP3794923B2 (en) | 2006-07-12 |
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