EP3793755B1 - Stretch-reducing mill having improved diameter tolerance and wall thickness tolerance - Google Patents
Stretch-reducing mill having improved diameter tolerance and wall thickness tolerance Download PDFInfo
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- EP3793755B1 EP3793755B1 EP19723369.5A EP19723369A EP3793755B1 EP 3793755 B1 EP3793755 B1 EP 3793755B1 EP 19723369 A EP19723369 A EP 19723369A EP 3793755 B1 EP3793755 B1 EP 3793755B1
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- 238000005096 rolling process Methods 0.000 claims description 34
- 230000007935 neutral effect Effects 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 description 13
- 230000009467 reduction Effects 0.000 description 10
- 238000009826 distribution Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/18—Roll crown; roll profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
Definitions
- the invention relates to a stretch-reducing mill for the production of seamless tubes, which has a plurality of roll stands arranged one behind the other in a conveying direction of the tubes, each with three rolls arranged at an angular distance of 120°.
- stretch-reducing and/or sizing mills which have several rolling stands arranged one behind the other in the conveying direction of the tube.
- the roll stands usually have three rolls which are arranged symmetrically around the tube at an angular spacing of 120°.
- the JP 2013 230500A which forms the basis for the preamble of claim 1, describes a stretch-reducing mill with several roll stands, each comprising three rolls at an angular spacing of 120°. Stretch-reducing mills of similar structure also go from the CN 101773937A , CN 101823076A , JP 2002 066609 A and JP 2001 129603 A out.
- One object of the invention is to improve the rolling quality of a stretch-reducing mill for the production of seamless tubes, in particular to make the rolled wall thicknesses more uniform.
- the stretch-reducing mill according to the invention serves to produce seamless tubes, preferably made of a metal material.
- the "stretch-reducing mill” is to be understood herein as a generic term for rolling mills which bring about both a reduction in the outside diameter of the tube and a reduction in the inside diameter, thereby causing the tube to elongate.
- the stretch reducing mill is preferably a mandrelless mill.
- the wall thickness of the tube can also be increased or decreased to a certain extent.
- the stretch-reducing mill has several roll stands arranged one behind the other in the conveying direction of the tubes, each with three rolls arranged at an angular distance of 120°.
- the rollers are thus arranged symmetrically around the pipe to exert a rolling force on the outer circumference of the pipe from three sides.
- the roll stands are divided into at least two groups, each with at least two roll stands, the rolls of adjacent roll stands within a group being offset relative to one another by an angle within the group. Further, the rolls of roll stands of adjacent groups are skewed relative to each other by a group angle smaller than the intra-group angle.
- interlacing or “set” include a relative twisting of adjacent roll stands (similar to groups)—more precisely, their rolls—by the specified group-internal angle (similar to group angles).
- group-internal angle similar to group angles.
- the rollers are symmetrically spaced 120° around the tube, a condition that corresponds to twisting through a certain angle can also be achieved by rotating through one or more other angles. For example, a twist of 60° can also be achieved by tilting by 180°.
- tilting or “twist” about an angle are used herein to denote a twist through that angle as well as through any equivalent angle.
- the twist can be either clockwise or counterclockwise with respect to the rolling direction.
- the roll stands are crossed in a group-related manner by a group angle that is smaller than the group-internal angle. Due to such a twist, the inner polygon formation of one group is superimposed with an inner polygon formation of the following group inclined by the group angle. In this way the approximation to a circular internal cross-section of the tube is improved.
- a further technical effect is that the angular displacement of the rollers in groups improves the temperature equalization in the tube if there is a temperature gradient along the radial direction of the tube. Both effects contribute to the equalization of the rolled wall thicknesses and thus to an improvement in the rolling quality when rolling seamless tubes.
- the intragroup angle is 60°, whereby portions of the tube are alternately rolled at the bottom or at the top of the gauge. This improves the wall thickness characteristics within the group.
- the group angle is preferably 30°.
- the rolls of the group-related roll stands preferably have a caliber shape that deviates from the circular shape. This way you can prevent material from entering the gap between the rolls, which could damage the surface of the rolled stock.
- At least one neutral roll stand is provided between two groups (seen in the conveying direction of the pipe), each with three rollers arranged at an angular distance of 120°, the caliber shape of which counteracts a torsional moment acting on the pipe.
- the neutral rolling stand thus serves to avoid twisting of the tube between two adjacent groups.
- the reason for any twisting of the barrel is that, particularly in the case of non-circular calibers, a torsional moment can act on the barrel about its own axis when a group-related set is applied.
- at least one neutral roll stand is preferably connected between adjacent groups.
- a neutral roll stand is characterized in that its caliber shape has a smaller deviation from the circular shape than that of the other stands.
- the reduction in diameter relative to the other stands can be reduced.
- the rolls of the one or more neutral roll stands have a circular or approximately circular caliber shape.
- the one or more neutral roll stands preferably do not form an independent group(s), rather they are preferably completely or at least partially a structural component of the groups defined above, for example the group located upstream in the conveying direction. Unless all of the neutral roll stands belonging to the transition between two groups are part of the upstream group, the remaining neutral roll stands preferably belong to the downstream group structurally. In this way, a special structural solution can be avoided.
- the size of the groups ie the number of roll stands in each group, can be made dependent on the dimension to be rolled. How to find preferably about 35% to 70% of the total diameter reduction occurs in the first group and the remaining diameter reduction occurs in the second group.
- the reason for this distribution is that the inner polygon formation gradually builds up and there is therefore a risk of overcompensation. In other words, in the case of an unfavorable distribution, the optimal compensation is not behind the last roll stand, but on an inside roll stand.
- the stretch-reducing mill is an extracting mill.
- a drawing mill is a rolling mill that is located downstream of a stretch rolling mill with a mandrel in order to pull the tube rolled out over the mandrel from the mandrel. Extracting rolling mills are increasingly being designed in such a way that, in addition to simply separating the tube from the mandrel, they also cause the tube to be relatively strongly deformed.
- the pipe has a comparatively strong temperature gradient from the outside (cold) to the inside (warm). If the pull-out mill is designed as a stretch-reducing mill, the inhomogeneous temperature distribution in the tube can have a particularly disadvantageous effect on the rolling result. For this reason, a group-related set is particularly suitable for a stretch-reducing rolling mill.
- the figure 1 is a schematic view of a stretch-reducing mill 1.
- the stretch-reducing mill 1 has a plurality of roll stands 10, fifteen in this case by way of example.
- the roll stands 10 can preferably be controlled individually.
- control device 2 preferably computer-based. If necessary, the control device 2 assumes the control of further components of the stretch-reducing mill 1. It should be pointed out that the term "control device” includes both centralized and decentralized structures for controlling the stretch-reducing mill 1. Accordingly, the control device 2 does not have to be located at the "site" of the stretch-reducing mill 1 or be part of the same. In addition, control tasks, data processing steps, etc. can be distributed to different computing devices, which then come under the name "control device” in their entirety. Furthermore, the communication of Controller 2 done with the components to be controlled both physically via cable and wirelessly.
- the tube R To roll a tube R, it runs in a conveying direction F through the stretch-reducing mill 1. Before it enters the stretch-reducing mill 1, the tube R has a wall thickness d1 on the inlet side. Upon exiting the last roll stand 10, the tube R has a wall thickness d2 and a reduced diameter.
- the wall thickness d2 is not necessarily reduced compared to the wall thickness d1; rather, depending on the roll speed, it can be smaller, but also greater than the initial wall thickness d1.
- the inlet-side and/or outlet-side wall thickness d1 or d2 can be measured using one or more wall thickness gauges (not shown).
- other process parameters can be measured or otherwise determined, for example the inlet and/or outlet speed of the tube R, the inlet and/or outlet weight of the tube R, etc.
- the determined process parameters can be transmitted to the control device 2 to control the rolling process.
- the figure 2 1 shows a roll stand 10, 10' with three rolls 11 which are arranged symmetrically around the tube R at an angular spacing of 120°.
- the rollers 11 each have a circular arc-shaped cross section of the roller surface, ie a round caliber shape.
- caliber base 13 the center of the rolling surface is referred to in cross section figure 2 and seen in the axial direction of the corresponding roller 11.
- gauge jump 14 The two outer ends of the rolling surface - also in cross section figure 2 and seen in the axial direction of the corresponding roll 11 - are referred to as gauge jump 14.
- the caliber base 13 and the caliber jump 14 are characteristic positions of the rolling surface.
- the caliber shape preferably deviates from a perfect arc of a circle.
- the reason for the deviation from the circular shape is that in this way it can be prevented that material enters the gap between adjacent rolls 11--more precisely, between the caliber jumps 14 of adjacent rolls 11. It is achieved by local caliber reduction and local caliber increase that deviations in the pipe diameter are compensated.
- the roll stands 10 are divided into two groups A and B, each having seven roll stands 10.
- the groups A, B are disjoint, ie they are arranged sequentially one after the other and do not overlap or interpenetrate.
- the rolls 11 of the roll stands 10 are offset against one another by an angle ⁇ I within the group of 60° or approximately 60°, so that the tube sections are rolled alternately in the base of the pass 13 or from the pass 14.
- the number of roll stands 10 per group A, B is dimensioned in such a way that the formation of the inner polygon is minimized.
- the number of roll stands 10 per group A, B is at least two, it is preferably in the range from 2 to 8.
- the number of roll stands 10 can vary from group A to group B.
- ⁇ G is equal to or about 30°. Due to such a twist, the inner polygon formation of a group A is superimposed with an inner polygon formation of the following group B inclined by ⁇ G . To a certain extent, an internal dodecahedron is produced whose deviations between a maximum wall thickness and a minimum wall thickness are significantly reduced compared to an internal hexagon. The inner geometry of the tube R is thus approximated to an ideal round.
- the group-related twisting or setting outlined above is shown schematically in figure 3 out.
- the roll stands 10 of groups A, B are shown schematically therein.
- the roll stands 10 or their rolls 11 (without reference numbers in the figure 3 ) alternately rotated and tilted by 180°, whereby the above-described twisting of 60° is achieved.
- a rotation of 90° was made between groups A and B, resulting in an entanglement of 30°.
- the two types of entanglement can also be achieved directly by rotation about the group angle ⁇ G and the group-internal angle ⁇ I .
- the one in the figure 3 However, the variant shown has design advantages, particularly when coupling the rollers 11 to the drives (not shown).
- the twist of 60° results, for example, by tilting the roll stands 10 by 180°.
- the drives can be arranged on the usual plug-in side and opposite the plug-in side in the case of internal power distribution. This simplifies the installation and maintenance of the drives, since the coupling can take place directly when the scaffolding is pushed in.
- the size of the groups A, B i.e. the number of roll stands 10 in the respective group A, B, can be made dependent on the dimension to be rolled. Thus, preferably about 35% to 70% of the total diameter reduction takes place in the first group A and the remaining diameter reduction in the second group B.
- the reason for this distribution is that the inner polygon formation gradually builds up and there is therefore a risk of overcompensation. In other words, in the case of an unfavorable distribution, the optimal compensation is not behind the last rolling stand 10, but on an inner rolling stand 10.
- the neutral Roll stand 10' serves to prevent twisting of the tube R between sets A and B.
- the reason for any twisting of the tube R is that in the case of a non-circular deformation, a torsional moment can act on the tube R about its own axis if a group-related twist of ⁇ G is applied.
- at least one neutral roll stand 10' is preferably connected between the groups A, B.
- the caliber shape of the rolls 11 of the neutral roll stand 10' is thus determined in such a way that the tendency to torsion is counteracted.
- the rolls 11 of the neutral roll stand 10' have a circular or approximately circular caliber shape, as in FIG figure 2 shown.
- a further technical effect is that the caliber base 13 offset in groups improves temperature compensation in the event of any temperature gradient in the tube R. This effect comes into play particularly when there is an inhomogeneous temperature distribution along the radial direction of the tube R, as occurs in particular in the case of extracting rolling mills.
- Pull-out mills which are normally located immediately after a mandrel-type stretch mill, serve to separate the tube R from the mandrel. At this stage of the process, the pipe R has a comparatively strong temperature gradient from the outside (cold) to the inside (warm).
- the pull-out mill is designed as a stretch-reducing mill 1, ie, in addition to separating mandrel and tube R, it is also designed for strong deformation of tube R, the inhomogeneous temperature distribution in tube R can have an adverse effect on the rolling result.
- a group-related constraint according to the exemplary embodiments presented is for this reason it is particularly suitable for a drawing mill, in particular a drawing mill designed as a stretch-reducing mill 1 .
- all individual features that are presented in the exemplary embodiments can be combined with one another and/or exchanged without departing from the scope of the invention defined by the claims.
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Description
Die Erfindung betrifft ein Streckreduzierwalzwerk zur Herstellung nahtloser Rohre, das mehrere in einer Förderrichtung der Rohre hintereinander angeordnete Walzgerüste mit jeweils drei im Winkelabstand von 120° angeordneten Walzen aufweist.The invention relates to a stretch-reducing mill for the production of seamless tubes, which has a plurality of roll stands arranged one behind the other in a conveying direction of the tubes, each with three rolls arranged at an angular distance of 120°.
Bei der Herstellung nahtloser Rohre kommen Streckreduzier- und/oder Maßwalzwerke zum Einsatz, die mehrere in Förderrichtung des Rohrs hintereinander angeordnete Walzgerüste aufweisen. Die Walzgerüste weisen üblicherweise drei Walzen auf, die im Winkelabstand von 120° symmetrisch um das Rohr herum angeordnet sind.In the production of seamless tubes, stretch-reducing and/or sizing mills are used, which have several rolling stands arranged one behind the other in the conveying direction of the tube. The roll stands usually have three rolls which are arranged symmetrically around the tube at an angular spacing of 120°.
Es ist bekannt, benachbarte Walzgerüste relativ zueinander um 60° verschränkt anzuordnen, so dass Abschnitte des zu walzenden Rohrs abwechselnd im Kalibergrund und vom Kalibersprung der Walzen gewalzt werden. So beschreibt die
Speziell bei dickwandigen Rohren in Verbindung mit großen Durchmesserreduktionen kommt es im Streckreduzierwalzwerk aufgrund der ungleichmäßigen Geschwindigkeitsverteilung zwischen Kalibergrund und Kalibersprung der Walzen zu einer ungleichmäßigen Ausbildung des Rohrinneren. Es bildet sich ein polygonartiger Innenquerschnitt senkrecht zur Rohrachse aus. Dieses Phänomen wird auch als "Innenpolygonbildung" bezeichnet. Wenn das Walzwerk als Ausziehwalzwerk fungiert, kommen erschwerend Temperaturunterschiede aus dem vorhergehenden Streckaggregat hinzu, die ebenfalls unterschiedliche Umformbedingungen zwischen Kalibergrund und Kalibersprung begründen. Dies überlagert die Innenpolygonbildung des nachfolgenden Aggregats und kann den Effekt somit verstärken. Die Innenpolygonbildung ist besonders ausgeprägt, wenn sowohl das Streckaggregat als auch das Ausziehwalzwerk in Dreiwalzenbauweise ausgeführt sind. Eine Vierwalzenbauweise als Alternative kommt zumeist aufgrund des begrenzten Einbauraums für die Walzenlagerungen und der damit einhergehenden geringen Aufnahmefähigkeit der Umformkräfte nicht in Frage.Especially with thick-walled tubes in connection with large reductions in diameter, there is an uneven formation of the inside of the tube in the stretch-reducing mill due to the uneven speed distribution between the bottom pass and the pass step of the rolls. A polygonal internal cross-section is formed perpendicular to the pipe axis. This phenomenon is also referred to as "internal polygon formation". If the rolling mill functions as a pull-out mill, temperature differences from the preceding stretching unit, which also cause different forming conditions between the bottom of the pass and the top of the pass, make matters worse. This overlays the interior polygon formation of the subsequent aggregate and can thus enhance the effect. The internal polygon formation is particularly pronounced when both the stretching unit and the pull-out mill are designed as three-rollers. A four-roller design as an alternative is usually out of the question due to the limited installation space for the roller bearings and the associated low capacity to absorb the forming forces.
Die
Eine Aufgabe der Erfindung besteht darin, die Walzqualität eines Streckreduzierwalzwerks zur Herstellung nahtloser Rohre zu verbessern, insbesondere die gewalzten Wanddicken zu vergleichmäßigen.One object of the invention is to improve the rolling quality of a stretch-reducing mill for the production of seamless tubes, in particular to make the rolled wall thicknesses more uniform.
Gelöst wird die Aufgabe mit einem Streckreduzierwalzwerk mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen folgen aus den Unteransprüchen, der folgenden Darstellung der Erfindung sowie der Beschreibung bevorzugter Ausführungsbeispiele.The object is achieved with a stretch-reducing mill having the features of
Das erfindungsgemäße Streckreduzierwalzwerk dient der Herstellung nahtloser Rohre, vorzugsweise aus einem Metallmaterial. Das "Streckreduzierwalzwerk" ist hierin als Oberbegriff für Walzwerke zu verstehen, die sowohl eine Reduktion des Außendurchmessers des Rohrs als auch eine Reduktion des Innendurchmessers bewirken, wodurch eine Längung des Rohrs bewirkt wird. Aus diesem Grund ist das Streckreduzierwalzwerk vorzugsweise ein dornloses Walzwerk. Je nach eingestellten Walzendrehzahlen kann auch die Wanddicke des Rohres in gewissem Umfang vergrößert oder verringert werden. Das Streckreduzierwalzwerk weist mehrere in Förderrichtung der Rohre hintereinander angeordnete Walzgerüste mit jeweils drei im Winkelabstand von 120° angeordneten Walzen auf. Die Walzen sind somit symmetrisch um das Rohr herum angeordnet, um von drei Seiten eine Walzkraft auf den Außenumfang des Rohrs auszuüben. Die Walzgerüste sind in mindestens zwei Gruppen mit jeweils mindestens zwei Walzgerüsten unterteilt, wobei die Walzen benachbarter Walzgerüste innerhalb einer Gruppe um einen gruppeninternen Winkel relativ zueinander verschränkt sind. Ferner sind die Walzen von Walzgerüsten benachbarter Gruppen um einen Gruppenwinkel, der kleiner als der gruppeninterne Winkel ist, relativ zueinander verschränkt.The stretch-reducing mill according to the invention serves to produce seamless tubes, preferably made of a metal material. The "stretch-reducing mill" is to be understood herein as a generic term for rolling mills which bring about both a reduction in the outside diameter of the tube and a reduction in the inside diameter, thereby causing the tube to elongate. For this reason, the stretch reducing mill is preferably a mandrelless mill. Depending on the set roller speeds, the wall thickness of the tube can also be increased or decreased to a certain extent. The stretch-reducing mill has several roll stands arranged one behind the other in the conveying direction of the tubes, each with three rolls arranged at an angular distance of 120°. The rollers are thus arranged symmetrically around the pipe to exert a rolling force on the outer circumference of the pipe from three sides. The roll stands are divided into at least two groups, each with at least two roll stands, the rolls of adjacent roll stands within a group being offset relative to one another by an angle within the group. Further, the rolls of roll stands of adjacent groups are skewed relative to each other by a group angle smaller than the intra-group angle.
Die Bezeichnungen "Verschränkung" oder "Schränkung" umfassen eine relative Verdrehung benachbarter Walzgerüste (analog Gruppen) - genauer gesagt, deren Walzen - um den genannten gruppeninternen Winkel (analog Gruppenwinkel). Da die Walzen jedoch symmetrisch im Winkelabstand von 120° um das Rohr herum angeordnet sind, kann ein Zustand, der einer Verdrehung um einen bestimmten Winkel entspricht, auch durch Drehung um einen oder mehrere andere Winkel erreicht werden. So wird beispielsweise eine Schränkung um 60° auch durch ein Kippen um 180° erzielt. Aus diesem Grund werden hierin die Bezeichnungen "Verschränkung" oder "Schränkung" um einen Winkel verwendet, um eine Verdrehung sowohl um diesen Winkel als auch um alle äquivalenten Winkel zu bezeichnen. Die Verdrehung kann in Bezug auf die Walzrichtung sowohl im Uhrzeigersinn als gegen den Uhrzeigersinn erfolgen.The terms "interlacing" or "set" include a relative twisting of adjacent roll stands (similar to groups)—more precisely, their rolls—by the specified group-internal angle (similar to group angles). However, because the rollers are symmetrically spaced 120° around the tube, a condition that corresponds to twisting through a certain angle can also be achieved by rotating through one or more other angles. For example, a twist of 60° can also be achieved by tilting by 180°. For this reason, the terms "twist" or "twist" about an angle are used herein to denote a twist through that angle as well as through any equivalent angle. The twist can be either clockwise or counterclockwise with respect to the rolling direction.
Erfindungsgemäß sind die Walzgerüste gruppenbezogen verschränkt, um einen Gruppenwinkel, der kleiner als der gruppeninterne Winkel ist. Durch eine derartige Schränkung wird die Innenpolygonbildung einer Gruppe mit einer um den Gruppenwinkel geneigten Innenpolygonbildung der nachfolgenden Gruppe überlagert. Auf diese Weise wird die Annäherung an einen kreisförmigen Innenquerschnitt des Rohrs verbessert. Eine weitere technische Wirkung besteht darin, dass durch die gruppenweise Winkelversetzung der Walzen der Temperaturausgleich im Rohr, sofern ein Temperaturgradient entlang der Radialrichtung des Rohrs vorliegt, verbessert wird. Beide Wirkungen tragen zur Vergleichmäßigung der gewalzten Wanddicken und damit zur Verbesserung der Walzqualität beim Walzen nahtloser Rohre bei.According to the invention, the roll stands are crossed in a group-related manner by a group angle that is smaller than the group-internal angle. Due to such a twist, the inner polygon formation of one group is superimposed with an inner polygon formation of the following group inclined by the group angle. In this way the approximation to a circular internal cross-section of the tube is improved. A further technical effect is that the angular displacement of the rollers in groups improves the temperature equalization in the tube if there is a temperature gradient along the radial direction of the tube. Both effects contribute to the equalization of the rolled wall thicknesses and thus to an improvement in the rolling quality when rolling seamless tubes.
Vorzugsweise beträgt der gruppeninterne Winkel 60°, wodurch Abschnitte des Rohrs alternierend im Kalibergrund oder vom Kalibersprung gewalzt werden. Dadurch wird die Wanddickenausprägung gruppenintern verbessert.Preferably, the intragroup angle is 60°, whereby portions of the tube are alternately rolled at the bottom or at the top of the gauge. This improves the wall thickness characteristics within the group.
Vorzugsweise beträgt der Gruppenwinkel 60°/n, wobei n eine Ganzzahl größer 1, d.h. n=2, 3, 4 ..., ist. Vorzugsweise beträgt der Gruppenwinkel 30°. Durch eine derartige Schränkung wird die Innenpolygonbildung einer ersten Gruppe mit einer um 30° geneigten Innenpolygonbildung einer nachfolgenden zweiten Gruppe überlagert. Es wird ein dodekaederförmiges Innenpolygon erzeugt, dessen Abweichungen zwischen einer maximalen Wanddicke und einer minimalen Wanddicke gegenüber einem sechseckförmigen Polygon deutlich reduziert sind.Preferably the group angle is 60°/n, where n is an integer greater than 1, i.e. n=2,3,4.... The group angle is preferably 30°. By such a twist, the interior polygon formation of a first group is superimposed with an interior polygon formation inclined by 30° of a subsequent second group. A dodecahedron-shaped inner polygon is generated, the deviations between a maximum wall thickness and a minimum wall thickness of which are significantly reduced compared to a hexagonal polygon.
Es sei darauf hingewiesen, dass die Walzenanzahl pro Kaliber prinzipiell von "drei" abweichen kann, insbesondere kommen vier Walzen pro Kaliber in Frage, auch wenn dies in der Praxis eher die Ausnahme ist. Im Falle von vier Walzen pro Kaliber beträgt der gruppeninterne Winkel vorzugsweise 45° und der Gruppenwinkel vorzugsweise 45°/n, wobei n eine Ganzzahl größer als 1, d.h. n=2, 3, 4 ..., ist.It should be pointed out that the number of rolls per caliber can in principle deviate from "three", in particular four rolls per caliber are possible, even if this is rather the exception in practice. In the case of four rolls per caliber, the intragroup angle is preferably 45° and the group angle is preferably 45°/n, where n is an integer greater than 1, i.e. n=2,3,4....
Vorzugsweise weisen die Walzen der gruppenbezogenen Walzgerüste eine von der Kreisform abweichende Kaliberform auf. Auf diese Weise lässt sich verhindern, dass Material in den Spalt zwischen den Walzen eintritt, wodurch die Oberfläche des Walzguts beschädigt werden könnte.The rolls of the group-related roll stands preferably have a caliber shape that deviates from the circular shape. This way you can prevent material from entering the gap between the rolls, which could damage the surface of the rolled stock.
Gemäß der Erfindung ist zwischen zwei Gruppen (in Förderrichtung des Rohrs gesehen) mindestens ein neutrales Walzgerüst mit jeweils drei im Winkelabstand von 120° angeordneten Walzen vorgesehen, deren Kaliberform einem auf das Rohr wirkenden Torsionsmoment entgegenwirken. Das neutrale Walzgerüst dient somit dazu, ein Verdrehen des Rohrs zwischen zwei benachbarten Gruppen zu vermeiden. Die Ursache für ein etwaiges Verdrehen des Rohrs liegt darin, dass insbesondere im Falle nicht-kreisförmiger Kaliber ein Torsionsmoment auf das Rohr um die eigene Achse wirken kann, wenn eine gruppenbezogene Schränkung angewendet wird. Um einer solchen Torsionsneigung entgegenzuwirken, wird vorzugsweise zumindest ein neutrales Walzgerüst zwischen benachbarte Gruppen geschaltet. Ein neutrales Walzgerüst ist dadurch gekennzeichnet, dass seine Kaliberform eine geringere Abweichung von der Kreisrundform hat, als die der anderen Gerüste. Zusätzlich kann die Durchmesserabnahme relativ zu den anderen Gerüsten verringert sein. Vorzugsweise weisen die Walzen des einen oder der mehreren neutralen Walzgerüste eine kreisrunde oder annähernd kreisrunde Kaliberform auf.According to the invention, at least one neutral roll stand is provided between two groups (seen in the conveying direction of the pipe), each with three rollers arranged at an angular distance of 120°, the caliber shape of which counteracts a torsional moment acting on the pipe. The neutral rolling stand thus serves to avoid twisting of the tube between two adjacent groups. The reason for any twisting of the barrel is that, particularly in the case of non-circular calibers, a torsional moment can act on the barrel about its own axis when a group-related set is applied. In order to counteract such a tendency to torsion, at least one neutral roll stand is preferably connected between adjacent groups. A neutral roll stand is characterized in that its caliber shape has a smaller deviation from the circular shape than that of the other stands. In addition, the reduction in diameter relative to the other stands can be reduced. Preferably, the rolls of the one or more neutral roll stands have a circular or approximately circular caliber shape.
Das eine bzw. die mehreren neutralen Walzgerüste bilden vorzugsweise keine eigenständige(n) Gruppe(n), vielmehr sind sie vorzugsweise vollständig oder zumindest teilweise baulicher Bestandteil der oben definierten Gruppen, etwa der jeweils in Förderrichtung stromaufwärts gelegenen Gruppe. Sofern nicht alle neutralen Walzgerüste, die zum Übergang zwischen zwei Gruppen gehören, Bestandteil der stromaufwärts gelegenen Gruppe sind, gehören die übrigen neutralen Walzgerüste baulich vorzugsweise der stromabwärts gelegenen Gruppe an. Auf diese Weise kann eine bauliche Sonderlösung vermieden werden.The one or more neutral roll stands preferably do not form an independent group(s), rather they are preferably completely or at least partially a structural component of the groups defined above, for example the group located upstream in the conveying direction. Unless all of the neutral roll stands belonging to the transition between two groups are part of the upstream group, the remaining neutral roll stands preferably belong to the downstream group structurally. In this way, a special structural solution can be avoided.
Die Größe der Gruppen, d.h. die Anzahl der Walzgerüste in der jeweiligen Gruppe, kann von der zu walzenden Abmessung abhängig gemacht werden. So finden vorzugsweise etwa 35% bis 70% der gesamten Durchmesserreduktion in der ersten Gruppe und die restliche Durchmesserreduktion in der zweiten Gruppe statt. Der Grund für diese Verteilung liegt darin, dass sich die Innenpolygonbildung nach und nach aufbaut und somit die Gefahr einer Überkompensation besteht. In anderen Worten, bei einer ungünstigen Verteilung liegt die optimale Kompensation nicht hinter dem letzten Walzgerüst, sondern an einem innenliegenden Walzgerüst.The size of the groups, ie the number of roll stands in each group, can be made dependent on the dimension to be rolled. How to find preferably about 35% to 70% of the total diameter reduction occurs in the first group and the remaining diameter reduction occurs in the second group. The reason for this distribution is that the inner polygon formation gradually builds up and there is therefore a risk of overcompensation. In other words, in the case of an unfavorable distribution, the optimal compensation is not behind the last roll stand, but on an inside roll stand.
Vorzugsweise ist das Streckreduzierwalzwerk ein Ausziehwalzwerk. Als Ausziehwalzwerk wird ein Walzwerk bezeichnet, das einem Streckwalzwerk mit Dorn nachgelagert ist, um das über den Dorn ausgewalzte Rohr vom Dorn abzuziehen. Ausziehwalzwerke werden vermehrt so konstruiert, dass sie neben der bloßen Trennung des Rohrs vom Dorn gleichzeitig eine vergleichsweise starke Umformung des Rohrs bewirken. Das Rohr weist in diesem Verfahrensstadium einen vergleichsweise starken Temperaturgradienten von außen (kalt) nach innen (warm) auf. Wenn somit das Ausziehwalzwerk als Streckreduzierwalzwerk ausgeführt ist, kann sich die inhomogene Temperaturverteilung im Rohr besonders nachteilig auf das Walzergebnis auswirken. Eine gruppenbezogene Schränkung ist aus diesem Grund für ein als Streckreduzierwalzwerk ausgeführtes Ausziehwalzwerk besonders geeignet.Preferably, the stretch-reducing mill is an extracting mill. A drawing mill is a rolling mill that is located downstream of a stretch rolling mill with a mandrel in order to pull the tube rolled out over the mandrel from the mandrel. Extracting rolling mills are increasingly being designed in such a way that, in addition to simply separating the tube from the mandrel, they also cause the tube to be relatively strongly deformed. At this stage of the process, the pipe has a comparatively strong temperature gradient from the outside (cold) to the inside (warm). If the pull-out mill is designed as a stretch-reducing mill, the inhomogeneous temperature distribution in the tube can have a particularly disadvantageous effect on the rolling result. For this reason, a group-related set is particularly suitable for a stretch-reducing rolling mill.
Weitere Vorteile und Merkmale der vorliegenden Erfindung sind aus der folgenden Beschreibung bevorzugter Ausführungsbeispiele ersichtlich. Die dort beschriebenen Merkmale können alleinstehend oder in Kombination mit einem oder mehreren der oben dargelegten Merkmale realisiert werden, insofern sich die Merkmale nicht widersprechen. Die folgende Beschreibung der bevorzugten Ausführungsbeispiele erfolgt mit Bezug auf die begleitenden Zeichnungen.Further advantages and features of the present invention are evident from the following description of preferred exemplary embodiments. The features described there can be implemented on their own or in combination with one or more of the features set out above, insofar as the features do not contradict one another. The following description of the preferred embodiments is made with reference to the accompanying drawings.
-
Die
Figur 1 ist eine schematische Ansicht eines Streckreduzierwalzwerks mit gruppierten Walzgerüsten.Thefigure 1 Fig. 12 is a schematic view of a clustered stand stretch reduction mill. -
Die
Figur 2 zeigt ein Walzgerüst in Dreiwalzenbauweise.Thefigure 2 shows a roll stand in three-roll design. -
Die
Figur 3 zeigt schematisch eine gruppenweise Schränkung von Walzgerüsten.Thefigure 3 shows a schematic of a group setting of roll stands.
Im Folgenden werden bevorzugte Ausführungsbeispiele anhand der Figuren beschrieben. Dabei sind gleiche, ähnliche oder gleichwirkende Elemente in den Figuren mit identischen Bezugszeichen versehen, und auf eine wiederholende Beschreibung dieser Elemente wird teilweise verzichtet, um Redundanzen zu vermeiden.Preferred exemplary embodiments are described below with reference to the figures. Elements that are the same, similar or have the same effect are provided with identical reference symbols in the figures, and a repeated description of these elements is sometimes dispensed with in order to avoid redundancies.
Die
Die Ansteuerung der Walzgerüste 10 erfolgt über eine Steuereinrichtung 2, vorzugsweise computerbasiert. Die Steuereinrichtung 2 übernimmt ggf. die Ansteuerung weiterer Komponenten des Streckreduzierwalzwerks 1. Es sei darauf hingewiesen, dass die Bezeichnung "Steuereinrichtung" sowohl zentrale als auch dezentrale Strukturen zur Steuerung des Streckreduzierwalzwerks 1 umfasst. Die Steuereinrichtung 2 muss sich demnach nicht am "Ort" des Streckreduzierwalzwerks 1 befinden oder Bestandteil desselben sein. Zudem können Steueraufgaben, Datenverarbeitungsschritte usw. auf verschiedene Recheneinrichtungen verteilt werden, die dann in ihrer Gesamtheit unter die Bezeichnung "Steuereinrichtung" fallen. Ferner kann die Kommunikation der Steuereinrichtung 2 mit den zu steuernden Komponenten sowohl physisch über Kabel als auch drahtlos erfolgen.The roll stands 10 are controlled via a
Zum Walzen eines Rohrs R läuft dieses in einer Förderrichtung F durch das Streckreduzierwalzwerk 1. Vor dem Eintritt in das Streckreduzierwalzwerk 1 weist das Rohr R eine einlaufseitige Wanddicke d1 auf. Beim Austritt aus dem letzten Walzgerüst 10 weist das Rohr R eine Wanddicke d2 und einen reduzierten Durchmesser auf. Die Wanddicke d2 ist nicht notwendigerweise gegenüber der Wanddicke d1 verringert, vielmehr kann sie je nach Walzendrehzahl kleiner, gleich aber auch größer als die Ausgangswanddicke d1 sein.To roll a tube R, it runs in a conveying direction F through the stretch-reducing
Die einlaufseitige und/oder auslaufseitige Wanddicke d1 bzw. d2 kann mittels eines oder mehrerer Wanddickenmessgeräte (nicht dargestellt) gemessen werden. Zusätzlich dazu können weitere Prozessparameter gemessen oder anderweitig bestimmt werden, beispielsweise die einlaufseitige und/oder auslaufseitige Geschwindigkeit des Rohrs R, das einlaufseitige und/oder auslaufseitige Gewicht des Rohrs R usw.. Die ermittelten Prozessparameter können zur Steuerung des Walzprozesses an die Steuereinrichtung 2 übertragen werden.The inlet-side and/or outlet-side wall thickness d1 or d2 can be measured using one or more wall thickness gauges (not shown). In addition, other process parameters can be measured or otherwise determined, for example the inlet and/or outlet speed of the tube R, the inlet and/or outlet weight of the tube R, etc. The determined process parameters can be transmitted to the
Die
Vorzugsweise weicht die Kaliberform von einem perfekten Kreisbogen ab. Der Grund für die Abweichung von der Kreisform liegt darin, dass auf diese Weise verhindert werden kann, dass Material in den Spalt zwischen benachbarter Walzen 11 - genauer gesagt, zwischen den Kalibersprüngen 14 benachbarter Walzen 11 - eintritt. Es wird durch lokale Kaliberverkleinerung und lokale Kalibervergrößerung erreicht, dass Abweichungen des Rohrdurchmessers kompensiert werden.The caliber shape preferably deviates from a perfect arc of a circle. The reason for the deviation from the circular shape is that in this way it can be prevented that material enters the gap between
Zurückkommend auf die
Die Gruppen A, B - genauer gesagt, die Walzen 11 der Walzgerüste 10 zweier, vorzugsweise benachbarter Gruppen A, B - sind um einen Winkel, der hierin als Gruppenwinkel αG bezeichnet wird, gegeneinander verschränkt. Vorzugsweise ist αG gleich oder ungefähr 30°. Durch eine derartige Schränkung wird die Innenpolygonbildung einer Gruppe A mit einer um αG geneigten Innenpolygonbildung der nachfolgenden Gruppe B überlagert. Es wird gewissermaßen ein Innendodekaeder erzeugt, dessen Abweichungen zwischen einer maximalen Wanddicke und einer minimalen Wanddicke gegenüber einem Innensechseck deutlich reduziert sind. Die Innengeometrie des Rohrs R wird somit einem idealen Rund angenähert.The groups A, B--more precisely, the
Die oben dargelegte gruppenbezogene Verdrehung bzw. Schränkung geht schematisch aus der
Die Größe der Gruppen A, B, d.h. die Anzahl der Walzgerüste 10 in der jeweiligen Gruppe A, B, kann von der zu walzenden Abmessung abhängig gemacht werden. So finden vorzugsweise etwa 35% bis 70% der gesamten Durchmesserreduktion in der ersten Gruppe A und die restliche Durchmesserreduktion in der zweiten Gruppe B statt. Der Grund für diese Verteilung liegt darin, dass sich die Innenpolygonbildung nach und nach aufbaut und somit die Gefahr einer Überkompensation besteht. In anderen Worten, bei einer ungünstigen Verteilung liegt die optimale Kompensation nicht hinter dem letzten Walzgerüst 10, sondern an einem innenliegenden Walzgerüst 10.The size of the groups A, B, i.e. the number of roll stands 10 in the respective group A, B, can be made dependent on the dimension to be rolled. Thus, preferably about 35% to 70% of the total diameter reduction takes place in the first group A and the remaining diameter reduction in the second group B. The reason for this distribution is that the inner polygon formation gradually builds up and there is therefore a risk of overcompensation. In other words, in the case of an unfavorable distribution, the optimal compensation is not behind the last rolling
Aus den
Aufgrund der gruppenbezogenen Schränkung um den Gruppenwinkel αG findet, wie oben dargelegt, eine verbesserte Annäherung der Innengeometrie des Rohrs R an einen idealen Kreisquerschnitt statt.Due to the group-related twisting around the group angle α G , as explained above, the inner geometry of the pipe R comes closer to an ideal circular cross-section.
Ein weiterer technischer Effekt besteht darin, dass durch den gruppenweise versetzten Kalibergrund 13 ein Temperaturausgleich bei einem etwaigen Temperaturgradienten im Rohr R verbessert wird. Dieser Effekt kommt besonders dann zum Tragen, wenn entlang der Radialrichtung des Rohrs R eine inhomogene Temperaturverteilung vorliegt, wie es insbesondere im Fall von Ausziehwalzwerken vorkommt. Ausziehwalzwerke, die sich normalerweise unmittelbar hinter einem Streckwalzwerk mit Dorn befinden, dienen dazu, das Rohr R vom Dorn zu trennen. Das Rohr R weist in diesem Verfahrensstadium einen vergleichsweise starken Temperaturgradienten von außen (kalt) nach innen (warm) auf. Wenn das Ausziehwalzwerk als Streckreduzierwalzwerk 1 ausgeführt ist, d.h. neben der Trennung von Dorn und Rohr R gleichzeitig für eine starke Umformung des Rohrs R ausgelegt ist, kann sich die inhomogene Temperaturverteilung im Rohr R nachteilig auf das Walzergebnis auswirken. Eine gruppenbezogene Schränkung gemäß den dargelegten Ausführungsbeispielen ist aus diesem Grund für ein Ausziehwalzwerk, insbesondere ein als Streckreduzierwalzwerk 1 ausgeführtes Ausziehwalzwerk, besonders geeignet. Soweit anwendbar können alle einzelnen Merkmale, die in den Ausführungsbeispielen dargelegt sind, miteinander kombiniert und/oder ausgetauscht werden, ohne den durch die Ansprüche definierten Bereich der Erfindung zu verlassen.A further technical effect is that the
- 11
- Streckreduzierwalzwerkstretch reducing mill
- 22
- Steuereinrichtungcontrol device
- 1010
- Walzgerüstmill stand
- 10'10'
- Neutrales WalzgerüstNeutral mill stand
- 1111
- Walzeroller
- 1313
- Kalibergrundcaliber reason
- 1414
- Kalibersprungcaliber leap
- AA
- Gruppe von WalzgerüstenGroup of rolling mills
- BB
- Gruppe von WalzgerüstenGroup of rolling mills
- RR
- RohrPipe
- Ff
- Förderrichtungconveying direction
- d1d1
- Einlaufseitige Wanddicke des RohrsUpstream wall thickness of the tube
- d2d2
- Auslaufseitige Wanddicke des RohrsDownstream wall thickness of the tube
- αIαI
- Gruppeninterner WinkelIntragroup angle
- αGαG
- Gruppenwinkelgroup angle
Claims (6)
- Stretch-reducing rolling mill (1) for producing seamless tubes (R), which comprises a plurality of roll stands (10), which are arranged in succession in a conveying direction (F) of the tubes (R), each with three rolls (11) arranged at an angular spacing of 120°, wherein the roll stands (10) are divided into at least two groups (A, B) each with at least two roll stands (10) andthe rolls (11) of adjacent roll stands (10) within one group (A, B) are staggered relative to one another by a group-internal angle αI,whereinthe rolls (11) of the roll stands (10) of adjacent groups (A, B) are staggered relative to one another by a group-internal angle αG, which is smaller than the group-internal angle αI,characterised in thatthe rolls (11) of the roll stands (10) of the groups (A, B) have a pass shape differing from the circular shape andprovided between two groups (A, B) is at least one neutral roll stand (10') with three respective rolls (11) which are arranged at an angular spacing of 120° and the pass shape of which has a smaller difference from the circularly round shape than that of the roll stands (10) of the groups (A, B).
- Stretch-reducing rolling mill (1) according to claim 1, characterised in that the group-internal angle αI is 60°.
- Stretch-reducing rolling mill (1) according to claim 1 or 2, characterised in that the group angle αG is 60°/n, wherein n is a whole number greater than 1.
- Stretch-reducing rolling mill (1) according to claim 3, characterised in that the group angle αG is 30°.
- Stretch-reducing rolling mill (1) according to any one of the preceding claims, characterised in that the pass shape of the rolls (11) of the neutral roll stand (10') has the shape of a segment of a circle.
- Stretch-reducing rolling mill (1) according to any one of the preceding claims, characterised in that this is a drawing rolling mill.
Applications Claiming Priority (2)
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DE102018207908.0A DE102018207908A1 (en) | 2018-05-18 | 2018-05-18 | Stretch reduction mill with improved diameter and wall thickness tolerance |
PCT/EP2019/061761 WO2019219463A1 (en) | 2018-05-18 | 2019-05-08 | Stretch-reducing mill having improved diameter tolerance and wall thickness tolerance |
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EP3793755A1 EP3793755A1 (en) | 2021-03-24 |
EP3793755B1 true EP3793755B1 (en) | 2023-07-26 |
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EP19723369.5A Active EP3793755B1 (en) | 2018-05-18 | 2019-05-08 | Stretch-reducing mill having improved diameter tolerance and wall thickness tolerance |
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US (1) | US20210078058A1 (en) |
EP (1) | EP3793755B1 (en) |
CN (1) | CN112135696A (en) |
AR (1) | AR114907A1 (en) |
DE (1) | DE102018207908A1 (en) |
RU (1) | RU2751408C1 (en) |
WO (1) | WO2019219463A1 (en) |
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CN113688501B (en) * | 2021-07-16 | 2022-04-15 | 北京科技大学 | Variable contact supporting roller shape design method considering rolling of plate strips with various widths |
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DE19758107A1 (en) * | 1997-12-17 | 1999-06-24 | Mannesmann Ag | Multi-stand mandrelless stretch-reducing mill |
JP2001129603A (en) * | 1999-11-01 | 2001-05-15 | Kawasaki Steel Corp | Drawing and rolling method of pipe |
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JP2013230500A (en) * | 2012-04-02 | 2013-11-14 | Nippon Steel & Sumitomo Metal Corp | Roll stand, and three-roll reducing mill mounting the same |
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BE572056A (en) * | 1957-11-02 | |||
SU997865A1 (en) * | 1981-09-10 | 1983-02-23 | Всесоюзный ордена Ленина научно-исследовательский и проектно-конструкторский институт металлургического машиностроения | Reduction mill two-stand unit |
JPS62187507A (en) * | 1986-02-12 | 1987-08-15 | Ishikawajima Harima Heavy Ind Co Ltd | Stretch reducing mill |
JPS63144807A (en) * | 1986-12-09 | 1988-06-17 | Kawasaki Steel Corp | Reducing method for round pipe |
IT1279085B1 (en) * | 1995-11-29 | 1997-12-04 | Innocenti Eng Spa | UNIT FOR LAMINATION FOR SPINDLE TUBES |
JP2002066621A (en) * | 2000-08-24 | 2002-03-05 | Kawasaki Steel Corp | Stretch-reducing method |
DE10157742C1 (en) * | 2001-11-24 | 2003-06-18 | Sms Meer Gmbh | Method of operating a stretch-reducing mill and stretch-reducing mill |
JP2007038263A (en) * | 2005-08-03 | 2007-02-15 | Jfe Steel Kk | Reducer for rolling pipe |
JP2008119706A (en) * | 2006-11-09 | 2008-05-29 | Sumitomo Metal Ind Ltd | Mandrel mill and operation method thereof, and method for manufacturing seamless pipe |
ITUB20155314A1 (en) * | 2015-10-23 | 2017-04-23 | Danieli Off Mecc | MULTI-CHAMBER MILL FOR ASTIFORM BODIES INCLUDING THREE ROLLED CAGES |
CN105363782A (en) * | 2015-11-30 | 2016-03-02 | 太原科技大学 | Stretch-reducing mill working set roll pass |
-
2018
- 2018-05-18 DE DE102018207908.0A patent/DE102018207908A1/en not_active Withdrawn
-
2019
- 2019-05-08 WO PCT/EP2019/061761 patent/WO2019219463A1/en active Application Filing
- 2019-05-08 US US17/054,641 patent/US20210078058A1/en not_active Abandoned
- 2019-05-08 CN CN201980033062.3A patent/CN112135696A/en active Pending
- 2019-05-08 RU RU2020137065A patent/RU2751408C1/en active
- 2019-05-08 EP EP19723369.5A patent/EP3793755B1/en active Active
- 2019-05-17 AR ARP190101324A patent/AR114907A1/en active IP Right Grant
Patent Citations (6)
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DE19758107A1 (en) * | 1997-12-17 | 1999-06-24 | Mannesmann Ag | Multi-stand mandrelless stretch-reducing mill |
JP2001129603A (en) * | 1999-11-01 | 2001-05-15 | Kawasaki Steel Corp | Drawing and rolling method of pipe |
JP2002066609A (en) * | 2000-08-31 | 2002-03-05 | Kawasaki Steel Corp | Stretch-reducing method for pipe |
CN101773937A (en) * | 2009-12-23 | 2010-07-14 | 太原通泽重工有限公司 | Grouping three-roller size-reducing mill |
CN101823076A (en) * | 2010-04-30 | 2010-09-08 | 太原通泽重工有限公司 | Packet three-roll size reducing mill |
JP2013230500A (en) * | 2012-04-02 | 2013-11-14 | Nippon Steel & Sumitomo Metal Corp | Roll stand, and three-roll reducing mill mounting the same |
Also Published As
Publication number | Publication date |
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EP3793755A1 (en) | 2021-03-24 |
CN112135696A (en) | 2020-12-25 |
RU2751408C1 (en) | 2021-07-13 |
DE102018207908A1 (en) | 2019-11-21 |
WO2019219463A1 (en) | 2019-11-21 |
US20210078058A1 (en) | 2021-03-18 |
AR114907A1 (en) | 2020-10-28 |
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