EP3049197B1 - Walzverfahren - Google Patents

Walzverfahren Download PDF

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Publication number
EP3049197B1
EP3049197B1 EP14758807.3A EP14758807A EP3049197B1 EP 3049197 B1 EP3049197 B1 EP 3049197B1 EP 14758807 A EP14758807 A EP 14758807A EP 3049197 B1 EP3049197 B1 EP 3049197B1
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EP
European Patent Office
Prior art keywords
roll gap
rolling
rolled
rolled product
product
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.)
Active
Application number
EP14758807.3A
Other languages
English (en)
French (fr)
Other versions
EP3049197A1 (de
Inventor
John Beaumont
Sandip SAMANTA
Birger Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Germany GmbH
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Primetals Technologies Germany GmbH
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Application filed by Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
Publication of EP3049197A1 publication Critical patent/EP3049197A1/de
Application granted granted Critical
Publication of EP3049197B1 publication Critical patent/EP3049197B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/06—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—Rolling
    • 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
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/24—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by screws
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness

Definitions

  • This invention relates to a method of rolling metal, in particular for production of high quality thick plate from ingots or thick slabs.
  • JP S58044904 A describes the use of tapered rolling to spread the material in the tapered slab, then turning the rolled material and applying further rolling, so eventually forming a rectangular plate.
  • GB 1 401 475 A discloses a method of rolling a metal plate from a thick slab, the method comprising:
  • a method of rolling a metal plate from an ingot or thick slab in a screwdown mill featuring mechanical screws that cannot be moved under load, comprises setting a work roll gap with a mechanical screw and rolling the ingot or slab through a first pass extending over the full length of the ingot or slab to produce a rolled product; removing the rolled product from the roll gap and using the mechanical screw to set a reduced roll gap; rolling the rolled product through the reduced roll gap over a partial pass, the partial pass extending over less than the full length of the rolled product, to form a further rolled product; and removing the further rolled product from the roll gap; wherein the method further comprises turning the rolled plate through 90° and carrying out a further roll pass in a width direction (also known as broadsiding) of the plate.
  • Rolling a metal plate, whether from an ingot or thick slab, using the method of the present invention to produce a rolled plate having a stepped profile allows older screwdown mills to be used to roll plate which has the required quality, without the loss of yield rendering the process uneconomical. Broadsiding of the rolled plate converts the thickness profile to a width increase in the plate geometry.
  • the method further comprises using the mechanical screw to set a further reduced roll gap; rolling the further rolled product through the further reduced roll gap over a partial pass, the partial pass extending over less than the full length of the further rolled product.
  • the method further comprises repeating the steps of removing the further rolled product from the roll gap, using the mechanical screw to set a further reduced roll gap and rolling the product over a partial pass for a set number of iterations to produce a rolled plate.
  • the number of iterations is determined according to parameters of required yield loss and rolling time.
  • the method further comprises counting the number of revolutions of the roll as the rolled product is removed from the roll gap to allow the next roll gap to be set; determining a difference in thickness between adjacent roll gap thickness settings; using the number of revolutions and determined difference in thickness to calculate the length of the product; and thereby deriving the length of the rolled product to be rolled at the next rolling stage.
  • edger controlled multiple reversing passes to produce thick plate has been the most common method to date, although the advent of hydraulically operated automatic gauge control has enabled mills to be constructed which are able to overcome the problems of rolling tapered ingots or thick slabs, whilst still providing sufficient austenite strain for a fine-grained, high quality product.
  • mechanical screw roll loading technology which either are not suitable, or economical to adapt to hydraulic cylinders and automatic gauge control.
  • the present invention aims to improve the yield during thick plate production in these screwdown mills.
  • Fig. illustrates how traditional cast ingots are tapered in thickness and width down their length. If standard rolling is applied to this type of ingot, without any special rolling strategy, then it can be seen from Fig.1 that the width taper will increase as the thickness is reduced. The result is a plate with uniform thickness, but with a width that tapers down the length. This results in a large amount of yield loss when shearing to form a rectangular product for sale.
  • Figs.4a to 4d illustrate an example of the method of the present invention for rolling tapered ingots or thick slabs using a screwdown system and multiple roll gap changes in a rolling mill 24.
  • the ingot or slab 20 is supported on a roller table 27 and moving in the direction of the arrow 30 enters a roll gap between work rolls 25 which roll gap has been pre-set.
  • the slab 20 is rolled to a first thickness, as shown in Fig.4a to produce rolled slab 21, and the rolled slab exits the work roll gap supported on roller table 26.
  • the screw is operated to change the roll gap by movement in the direction of the arrow 33 to the next required roll gap 34b and the process of rolling part of the length, stopping and reversing out of the roll gap is repeated.
  • the work rolls are set to have a slightly smaller gap than the previous roll gap and the plate is rolled again.
  • the slab formed has a section of thickness of the first roll gap and a section of thickness of each subsequent roll gap.
  • the slab is reversed out of the work roll gap, so that the gap can be adjusted using the mechanical screws and then a next rolling pass reduces the thickness of the slab over a partial length, but does not roll all of the length of the previously rolled sections again.
  • the rolling is not over the full length, but stops at a boundary of formed between the immediately proceeding section and the most recent section. Rolling, reversing out and adjustment of the roll gap continue until a desired minimum thickness of the final section has been reached.
  • each rolling pass the rolled product becomes longer, so in order to control the point to which each subsequent pass should roll, the number of revolutions of the roll are counted.
  • the difference in thickness between each step along the taper is known from the different gaps produced by each different screw setting, allowing a calculation of how much longer the slab has become and so how far to go back in for the next rolling stage.
  • a constant ramp change which is used in systems having an AGC cylinder controlled system
  • multiple step changes are induced to approximate the desired constant ramp change during the introduction of variable thickness taper. This is performed by adjusting roll gap using the mechanical screw for multiple rolling stages of decreasing roll gap and increasing roll length until the entire length is rolled. The result is a plate with a thickness profile similar to a staircase.
  • Figs.5a and 5b show the profile in plan view and cross section respectively.
  • Outline 11 indicates the shape of the ingot, seen from above, before rolling and outline 12 the shape after rolling.
  • Outline 13 shows the cross section before rolling and outline 14, the cross section after rolling.
  • step changes used in the rolling method is determined according to the process requirements. Where yield loss is less of an issue, a high yield loss is accepted by using fewer steps to get a low rolling time per ingot. If rolling time is not an issue, but reducing yield loss is important, then a greater number of steps are used, over a longer period of time.
  • the method applied to the screwdown mill does not require the use of an edger with rolls before or after the mill to impart force to the edges on the plate. This helps make the process simpler and applicable to using basic mill technology.
  • the present invention provides a process for rolling steel ingots, with both width and thickness tapers, into plate.
  • the process may be used where the resulting plate has a thickness above 120mm, giving more uniform thickness and width throughout, without the need to use an edger in any passes.
  • a further pass in width direction (broad siding) is used to convert the thickness profile to a width increase in the plate geometry.

Landscapes

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

Claims (5)

  1. Verfahren zum Walzen einer Metallplatte aus einem Block oder einer dicken Bramme in einer Schraubenmühle, die mechanische Schrauben aufweist, die unter Last nicht bewegt werden können, wobei das Verfahren umfasst:
    Einstellen eines Arbeitswalzspalts mit einer mechanischen Schraube, und Walzen des Blocks oder der dicken Bramme in einem ersten Durchgang, der sich über die vollständige Länge des Blocks oder der dicken Bramme erstreckt, um einen gewalzten Gegenstand herzustellen; Entfernen des gewalzten Gegenstands aus dem Walzspalt und Verwenden der mechanischen Schraube, um einen verkleinerten Walzspalt einzustellen;
    Walzen des gewalzten Gegenstands durch den verkleinerten Walzspalt in einem Teildurchgang, wobei sich der Teildurchgang über weniger als die vollständige Länge des gewalzten Gegenstands erstreckt, um einen weiteren gewalzten Gegenstand zu bilden; und Entfernen des weiteren gewalzten Gegenstands aus dem Walzspalt;
    wobei das Verfahren außerdem ein Drehen der gewalzten Platte um 90° und ein Ausführen eines weiteren Walzdurchgangs in einer Breitenrichtung (über eine Breitseite) der Platte umfasst.
  2. Verfahren nach Anspruch 1, wobei das Verfahren außerdem umfasst: Verwenden der mechanischen Schraube, um einen weiter verkleinerten Walzspalt einzustellen;
    Walzen des weiter gewalzten Gegenstands durch den weiter verkleinerten Walzspalt in einem Teildurchgang, wobei sich der Teildurchgang über weniger als die vollständige Länge des weiter gewalzten Gegenstands erstreckt.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, wobei das Verfahren außerdem ein Wiederholen der Schritte eines Entfernens des weiteren gewalzten Gegenstands aus dem Walzspalt, eines Verwendens der mechanischen Schraube, um einen noch weiter verkleinerten Walzspalt einzustellen, und eines Walzens des Gegenstands in einem Teildurchgang mit einer eingestellten Anzahl von Wiederholungen umfasst, um eine gewalzte Platte herzustellen.
  4. Verfahren nach Anspruch 3, wobei die Anzahl von Wiederholungen gemäß den Parametern der erforderlichen Produktionsverluste und Walzzeiten ermittelt wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Verfahren außerdem umfasst: Zählen der Anzahl von Umdrehungen der Walze, wenn der gewalzte Gegenstand aus dem Walzspalt entfernt wird, um zu erlauben, dass der nächste Walzspalt eingestellt wird; Erhalten eines Unterschieds der Dicke zwischen aufeinanderfolgenden Walzspaltdickeeinstellungen; und Verwenden der Anzahl von Umdrehungen und des Unterschieds der Dicke, um die Länge des Gegenstands zu berechnen; und daraus Ableiten der Länge des zu walzenden gewalzten Gegenstands in dem nächsten Walzschritt.
EP14758807.3A 2013-09-24 2014-08-19 Walzverfahren Active EP3049197B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1316917.2A GB2518444A (en) 2013-09-24 2013-09-24 Rolling Method
PCT/EP2014/067678 WO2015043837A1 (en) 2013-09-24 2014-08-19 Rolling method

Publications (2)

Publication Number Publication Date
EP3049197A1 EP3049197A1 (de) 2016-08-03
EP3049197B1 true EP3049197B1 (de) 2018-01-31

Family

ID=49553306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14758807.3A Active EP3049197B1 (de) 2013-09-24 2014-08-19 Walzverfahren

Country Status (5)

Country Link
US (1) US20160271661A1 (de)
EP (1) EP3049197B1 (de)
CN (1) CN106061635A (de)
GB (1) GB2518444A (de)
WO (1) WO2015043837A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3301197B1 (de) * 2016-09-29 2021-10-27 Outokumpu Oyj Verfahren zur kaltverformung eines austenitischen stahls
JP6798567B2 (ja) * 2019-01-21 2020-12-09 Ｊｆｅスチール株式会社 鋼塊圧延方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024899B2 (de) * 1971-09-18 1975-08-19
JPS5844904A (ja) * 1981-09-10 1983-03-16 Sumitomo Metal Ind Ltd 厚板圧延方法
JPS58192607A (ja) * 1982-05-06 1983-11-10 Sumitomo Metal Ind Ltd 厚鋼板の圧延方法
JPS6061106A (ja) * 1983-09-16 1985-04-08 Kawasaki Steel Corp 異厚鋼板の圧延方法
JPS61172603A (ja) * 1985-01-29 1986-08-04 Sumitomo Metal Ind Ltd 厚板圧延法
DE102006011939A1 (de) * 2006-03-15 2007-09-27 Siemens Ag Walzverfahren für ein Walzgut zum Einbringen einer Stufe in das Walzgut
CN1850376A (zh) * 2006-04-29 2006-10-25 东北大学 梯形宽度钢板的轧制方法
CN101406901B (zh) * 2008-11-14 2010-10-27 中冶陕压重工设备有限公司 片、块式钼板全自动可逆轧制控制方法
EP2500113A1 (de) * 2011-03-14 2012-09-19 Siemens Aktiengesellschaft Verfahren sowie Walzstrasse zum Walzen eines in einem Blockgussverfahren hergestellten Walzgutes, Steuer- und/oder Regeleinrichtung für eine Walzstrasse, maschinenlesbarer Programmcode für eine Steuer- und/oder Regeleinrichtung sowie Speichermedium

Also Published As

Publication number Publication date
US20160271661A1 (en) 2016-09-22
GB2518444A (en) 2015-03-25
EP3049197A1 (de) 2016-08-03
GB201316917D0 (en) 2013-11-06
CN106061635A (zh) 2016-10-26
WO2015043837A1 (en) 2015-04-02

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