EP3793755A1 - Streckreduzierungswalzwerk mit verbesserter durchmesser- und wanddickentoleranz - Google Patents
Streckreduzierungswalzwerk mit verbesserter durchmesser- und wanddickentoleranzInfo
- Publication number
- EP3793755A1 EP3793755A1 EP19723369.5A EP19723369A EP3793755A1 EP 3793755 A1 EP3793755 A1 EP 3793755A1 EP 19723369 A EP19723369 A EP 19723369A EP 3793755 A1 EP3793755 A1 EP 3793755A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- group
- stretch
- reducing mill
- rollers
- rolling stands
- 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
- 238000005096 rolling process Methods 0.000 claims description 71
- 230000007935 neutral effect Effects 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 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
- 238000000265 homogenisation 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
- 238000004537 pulping Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
-
- 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
-
- 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
-
- 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 rolling stands arranged one behind the other in a conveying direction of the tubes, each having three rollers arranged at an angular distance of 120 °.
- draft-reducing and / or sizing mills which have a plurality of rolling mills arranged one behind the other in the conveying direction of the pipe.
- the rolling stands usually have three rollers, which are arranged at an angular distance of 120 ° symmetrically around the tube. It is known to arrange adjacent rolling stands relative to each other by 60 ° entangled, so that sections of the pipe to be rolled are rolled alternately in the caliber base and the jump in the caliber of the rolls.
- WO 2017/068533 A1 describes a rolling mill with a first section which has a plurality of rolling stands and is adapted for rolling via a mandrel inserted into the pipe, and a second section which has a plurality of rolling stands and is set up for rolling without a mandrel ,
- the rolling stands each have three rollers.
- the axes of rotation of the rolls of adjacent roll stands are each tilted by 180 °, as shown in FIGS. 1A and 1B of WO 2017/068533 A1. This corresponds to an entanglement around the above 60 °.
- the stretch-reducing mill according to the invention serves to produce seamless tubes, preferably of a metal material.
- the "stretch-reducing mill” is to be understood here as a generic term for rolling mills, which is both a reduction of the Outer diameter of the tube as well as a reduction of the inner diameter, whereby an elongation of the tube is effected.
- the stretch reducing mill is preferably a mandrelless rolling mill.
- the wall thickness of the tube can be increased or reduced to some extent.
- the stretch-reducing mill has a plurality of rolling mills arranged one behind the other in the conveying direction of the tubes, each having three rollers arranged at an angular distance of 120 °.
- the rollers are thus arranged symmetrically around the tube to exert a rolling force on the outer circumference of the tube from three sides.
- the rolling stands are subdivided into at least two groups, each with at least two rolling stands, wherein the rolls of adjacent rolling stands within a group are interlocked relative to one another by a group-internal angle. Further, the rolls of stands of adjacent groups are interlocked relative to each other by a group angle smaller than the intra-group angle.
- the terms “entanglement” or “offset” encompass a relative rotation of adjacent rolling stands (analogous to groups) - more precisely, their rolls - around said group-internal angle (analogous to group angle).
- the rolls are arranged symmetrically about the pipe at an angular interval of 120 °, a condition corresponding to a rotation by a certain angle can be obtained by rotating at one or more other angles. For example, a 60 ° tilt is achieved by tilting by 180 °.
- the terms “entanglement” or “skew” are used herein by an angle to denote a twist both at this angle and at all equivalent angles. The twisting can be done with respect to the rolling direction both clockwise and counterclockwise.
- the rolling stands are interlocked group-wise, to a group angle which is smaller than the intra-group angle.
- Restriction is superimposed on the internal polygon formation of a group with a group angle inclined inside polygon formation of the following group.
- Another technical effect is that by the groupwise angular displacement of the rollers, the temperature compensation in the pipe, if a temperature gradient along the radial direction of the tube is present, is improved. Both effects contribute to the homogenization of the rolled wall thicknesses and thus to the improvement of the rolling quality when rolling seamless pipes.
- the intra-group angle is 60 °, whereby portions of the tube are rolled alternately in the caliber base or by the caliber jump.
- the wall thickness characteristic is improved within the group.
- the group angle is 30 °.
- the number of rolls per caliber may differ in principle from “three”, in particular, four rolls per caliber come into question, even if this is rather the exception in practice.
- the rolls of the group-related rolling stands preferably have a caliber shape deviating from the circular shape. That way you can prevent material from entering the nip between the rolls, which could damage the surface of the stock.
- At least one neutral rolling mill is provided, 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 mill stand thus serves to avoid twisting of the pipe between two adjacent groups.
- the reason for a possible twisting of the tube is that, in particular in the case of non-circular caliber, a torsion moment can act on the tube about its own axis if a group-related setting is applied.
- at least one neutral roll stand is preferably connected between adjacent groups.
- a neutral rolling mill may be characterized, for example, by the fact that its caliber shape has a smaller deviation from the circular shape than that of the other stands and / or the decrease in diameter relative to the other stands.
- the rolls of the one or more neutral rolling stands have a circular or approximately circular caliber shape.
- the one or more neutral rolling mills preferably do not form a separate group (s), but rather are preferably completely or at least partially structural components of the groups defined above, such as the upstream group in each case. Unless all of the neutral rolling stands belonging to the transition between two groups are part of the upstream group, the remaining neutral rolling stands are structurally preferred to the downstream group. In this way, a special construction solution can be avoided.
- the size of the groups ie the number of rolling stands in the respective group, can be made dependent on the dimension to be rolled. So find preferably about 35% to 70% of the total diameter reduction in the first group and the remaining diameter reduction in the second group. The reason for this distribution is that the inner polygon formation gradually builds up and thus there is a risk of overcompensation. In other words, in the case of an unfavorable distribution, the optimum compensation does not lie behind the last roll stand, but on an inner roll stand.
- the stretch reducing mill is a pullout mill.
- a rolling mill is referred to, which is downstream of a drafting mill with mandrel to deduct the rolled over the mandrel tube from the mandrel.
- Ausziehwalzwerke be increasingly designed so that they at the same time cause a relatively strong deformation of the tube in addition to the mere separation of the tube from the mandrel.
- the tube has a comparatively high temperature gradient from the outside (cold) to the inside (warm) at this stage of the process.
- the Ausziehwalzer is designed as a stretch-reducing mill, the inhomogeneous temperature distribution in the pipe can have a particularly adverse effect on the rolling result.
- a group-related setting is particularly suitable for a drawing-out mill designed as a stretch-reducing mill.
- FIG. 1 is a schematic view of a stretch reducing mill with grouped rolling stands.
- FIG. 2 shows a roll stand in a three-roll design.
- FIG. 3 schematically shows a groupwise setting of rolling stands.
- FIG. 1 is a schematic view of a stretch-reducing mill 1.
- the stretch-reducing mill 1 has a plurality of rolling stands 10, here by way of example fifteen.
- the rolling stands 10 are preferably individually controllable.
- the rotational speeds of rollers 11 (cf., FIG. 2) of the rolling stands 10 are individually adjustable.
- control device 2 The control of the rolling stands 10 via a 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 noted that the term “control device” encompasses both centralized and decentralized structures for controlling the stretch-reducing mill 1. Accordingly, the control device 2 does not have to be at the "location" of the stretch-reducing mill 1 or be part of it. In addition, control tasks, data processing steps, etc. can be distributed to different computing devices, which then fall in their entirety under the name "controller”. Furthermore, the communication of the Control device 2 done with the components to be controlled both physically via cable and wirelessly.
- the pipe R For rolling a pipe R, this runs in a conveying direction F through the stretch-reducing mill 1.
- the pipe R Before entering the stretch-reducing mill 1, the pipe R has an inlet-side wall thickness d1.
- the tube R At the exit from the last stand 10, the tube R has a wall thickness d2 and a reduced diameter.
- the wall thickness d2 is not necessarily reduced with respect to the wall thickness d1, but may be smaller, but equal or greater than the initial wall thickness d1, depending on the roller speed.
- the inlet-side and / or outlet-side wall thickness d1 or d2 can be measured by means of one or more wall thickness measuring devices (not shown).
- other process parameters may be measured or otherwise determined, for example, the inlet side and / or outlet side velocity of the tube R, the inlet side and / or outlet side weight of the tube R, etc.
- the determined process parameters may be transmitted to the controller 2 for controlling the rolling process ,
- FIG. 2 shows a roll stand 10, 10 'with three rolls 11, which are arranged symmetrically around the pipe R at an angular distance of 120 °.
- the rollers 11 each have a circular arc-shaped cross section of the rolling surface, ie a round caliber shape, according to this embodiment.
- the caliber base 13 is the center of the rolling surface, seen in the cross section of FIG. 2 and in the axial direction of the corresponding roller 11.
- the two outer ends of the rolling surface - also seen in the cross section of Figure 2 and in the axial direction of the corresponding roller 11 - are referred to as a jump in velocity 14.
- the caliber base 13 and the caliber jump 14 are characteristic positions of the rolling surface.
- the caliber shape deviates from a perfect circular arc.
- 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 rollers 11 - more precisely, between the caliber cracks 14 of adjacent rollers 11 -. It is achieved by local caliber reduction and local caliber enlargement, that deviations of the pipe diameter are compensated.
- the rolling stands 10 are subdivided into two groups A and B, which each have seven rolling stands 10.
- the groups A, B are disjoint, i. they are arranged sequentially one behind the other and do not overlap or penetrate each other.
- the rollers 11 of the rolling stands 10 according to the present embodiment by a group-internal angle ai of 60 ° or about 60 ° against each other entangled, so that the pipe sections are alternately rolled in each caliber base 13 or 14 from the caliber jump.
- the number of rolling stands 10 per group A, B is in this case dimensioned so that the formation of the inner polygon is minimized.
- the number of rolling stands 10 per group A, B is at least two, preferably in the range of 2 to 8.
- the number of rolling stands 10 may vary from group A to group B.
- O G is equal to or about 30 °.
- the rolling stands 10 of the groups A, B are shown schematically.
- a group A, B are the rolling stands 10 and their rollers 11 (without reference numerals in Figure 3) alternately rotated by 180 ° or tilted, whereby the above-described entanglement of 60 ° is achieved.
- a rotation of 90 ° was made between groups A and B, resulting in a 30 ° entanglement.
- the two types of entanglement can also be achieved directly by rotation about the group angle O G and the group internal angle ai.
- the variant shown in Figure 3 has constructive advantages, especially in the coupling of the rollers 11 to the drives (not shown).
- the 60 ° offset results, for example, by tilting the rolling stands 10 by 180 °.
- the drives can be arranged with an internal power distribution on the usual insertion side and opposite the insertion side. This simplifies the installation and maintenance of the drives, since the coupling can take place directly when the scaffolding is inserted.
- the size of the groups A, B ie the number of rolling 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 in the first group A and the remaining diameter reduction in the second group B take place. The reason for this distribution is that the inner polygon formation gradually builds up and thus there is a risk of overcompensation.
- the neutral one Roll stand 10 ' serves to prevent twisting of the pipe R between the groups A and B.
- the cause of a possible 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 limitation of OG is applied.
- At least one neutral roll stand 10 ' is preferably connected between the groups A, B.
- the rollers 11 of the neutral roll stand 10 ' have a circular or approximately circular caliber shape, as shown in FIG.
- Another technical effect is that by the groupwise offset caliber base 13, a temperature compensation at a possible temperature gradient in the tube R is improved. This effect is particularly noticeable when there is an inhomogeneous temperature distribution along the radial direction of the tube R, as is the case in particular in the case of
- Ausziehwalzwerken occurs. Ausziehwalzwerke, which are normally located immediately behind a drafting mill with mandrel, serve to separate the tube R from the mandrel.
- the tube R has a comparatively high temperature gradient from the outside (cold) to the inside (warm) in this stage of the process.
- the Ausziehwalztechnik is designed as a stretch-reducing mill 1, that is designed in addition to the separation of mandrel and pipe R at the same time for a strong deformation of the tube R, the inhomogeneous temperature distribution in the tube R can adversely affect the rolling result.
- a group-related restriction according to the disclosed embodiments is for this reason, for a Ausziehwalzwerk, in particular designed as a stretch-reducing mill 1 Ausziehwalzer, particularly suitable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018207908.0A DE102018207908A1 (de) | 2018-05-18 | 2018-05-18 | Streckreduzierungswalzwerk mit verbesserter Durchmesser- und Wanddickentoleranz |
PCT/EP2019/061761 WO2019219463A1 (de) | 2018-05-18 | 2019-05-08 | Streckreduzierungswalzwerk mit verbesserter durchmesser- und wanddickentoleranz |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3793755A1 true EP3793755A1 (de) | 2021-03-24 |
EP3793755B1 EP3793755B1 (de) | 2023-07-26 |
Family
ID=66484037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19723369.5A Active EP3793755B1 (de) | 2018-05-18 | 2019-05-08 | Streckreduzierwalzwerk mit verbesserter durchmesser- und wanddickentoleranz |
Country Status (7)
Country | Link |
---|---|
US (1) | US20210078058A1 (de) |
EP (1) | EP3793755B1 (de) |
CN (1) | CN112135696A (de) |
AR (1) | AR114907A1 (de) |
DE (1) | DE102018207908A1 (de) |
RU (1) | RU2751408C1 (de) |
WO (1) | WO2019219463A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113688501B (zh) * | 2021-07-16 | 2022-04-15 | 北京科技大学 | 一种兼顾多种宽度板带轧制的变接触支持辊辊形设计方法 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE572056A (de) * | 1957-11-02 | |||
SU997865A1 (ru) * | 1981-09-10 | 1983-02-23 | Всесоюзный ордена Ленина научно-исследовательский и проектно-конструкторский институт металлургического машиностроения | Двухклетевой блок редукционного стана |
JPS62187507A (ja) * | 1986-02-12 | 1987-08-15 | Ishikawajima Harima Heavy Ind Co Ltd | ストレツチレジユ−シングミル |
JPS63144807A (ja) * | 1986-12-09 | 1988-06-17 | Kawasaki Steel Corp | 円管の絞り圧延方法 |
IT1279085B1 (it) * | 1995-11-29 | 1997-12-04 | Innocenti Eng Spa | Unita' per la laminazione per tubi su mandrino |
DE19758107A1 (de) * | 1997-12-17 | 1999-06-24 | Mannesmann Ag | Mehrgerüstiges dornloses Streckreduzierwalzwerk |
JP2001129603A (ja) * | 1999-11-01 | 2001-05-15 | Kawasaki Steel Corp | 管の絞り圧延方法 |
JP2002066621A (ja) * | 2000-08-24 | 2002-03-05 | Kawasaki Steel Corp | 絞り圧延方法 |
JP4470300B2 (ja) * | 2000-08-31 | 2010-06-02 | Jfeスチール株式会社 | 管の絞り圧延方法 |
DE10157742C1 (de) * | 2001-11-24 | 2003-06-18 | Sms Meer Gmbh | Verfahren zum Betreiben eines Streckreduzierwalzwerks und Streckreduzierwalzwerk |
JP2007038263A (ja) * | 2005-08-03 | 2007-02-15 | Jfe Steel Kk | 管圧延用レデューサ |
JP2008119706A (ja) * | 2006-11-09 | 2008-05-29 | Sumitomo Metal Ind Ltd | マンドレルミルおよびその操業方法ならびに継目無管の製造方法 |
CN101773937A (zh) * | 2009-12-23 | 2010-07-14 | 太原通泽重工有限公司 | 分组三辊定减径机 |
CN101823076A (zh) * | 2010-04-30 | 2010-09-08 | 太原通泽重工有限公司 | 分组三辊定减径机 |
JP6094275B2 (ja) * | 2012-04-02 | 2017-03-15 | 新日鐵住金株式会社 | ロールスタンド、およびこれを搭載した3ロール式絞り圧延機 |
ITUB20155314A1 (it) | 2015-10-23 | 2017-04-23 | Danieli Off Mecc | Laminatoio multigabbia per corpi astiformi comprendente gabbie a tre rulli motorizzati |
CN105363782A (zh) * | 2015-11-30 | 2016-03-02 | 太原科技大学 | 张力减径机工作机组轧辊孔型 |
-
2018
- 2018-05-18 DE DE102018207908.0A patent/DE102018207908A1/de not_active Withdrawn
-
2019
- 2019-05-08 RU RU2020137065A patent/RU2751408C1/ru active
- 2019-05-08 EP EP19723369.5A patent/EP3793755B1/de active Active
- 2019-05-08 US US17/054,641 patent/US20210078058A1/en not_active Abandoned
- 2019-05-08 WO PCT/EP2019/061761 patent/WO2019219463A1/de active Application Filing
- 2019-05-08 CN CN201980033062.3A patent/CN112135696A/zh active Pending
- 2019-05-17 AR ARP190101324A patent/AR114907A1/es active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP3793755B1 (de) | 2023-07-26 |
DE102018207908A1 (de) | 2019-11-21 |
CN112135696A (zh) | 2020-12-25 |
RU2751408C1 (ru) | 2021-07-13 |
AR114907A1 (es) | 2020-10-28 |
WO2019219463A1 (de) | 2019-11-21 |
US20210078058A1 (en) | 2021-03-18 |
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