EP0466570A1 - Umkehrbares Walzverfahren - Google Patents

Umkehrbares Walzverfahren Download PDF

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Publication number
EP0466570A1
EP0466570A1 EP91401892A EP91401892A EP0466570A1 EP 0466570 A1 EP0466570 A1 EP 0466570A1 EP 91401892 A EP91401892 A EP 91401892A EP 91401892 A EP91401892 A EP 91401892A EP 0466570 A1 EP0466570 A1 EP 0466570A1
Authority
EP
European Patent Office
Prior art keywords
pass
thickness
engagement
product
spacing
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
Application number
EP91401892A
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English (en)
French (fr)
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EP0466570B1 (de
Inventor
Michel Morel
Andrzej Farnik
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.)
Clecim SAS
Original Assignee
Clecim SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Clecim SAS filed Critical Clecim SAS
Publication of EP0466570A1 publication Critical patent/EP0466570A1/de
Application granted granted Critical
Publication of EP0466570B1 publication Critical patent/EP0466570B1/de
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—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
    • 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
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product
    • B21B2273/14—Front end or leading end
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current

Definitions

  • the invention relates to a method of rolling a flat product in a reversible rolling mill.
  • the invention applies in particular to the hot rolling of aluminum but can also be used for other non-ferrous metals and, even, under certain conditions, for ferrous metals such as steel.
  • hot rolling can advantageously be carried out in a reversible manner in a rolling mill comprising a single cage associated with means for controlling the passage of the laminated product, alternately in one direction then in the other.
  • the rolling mill comprises, in a quarto arrangement, two working rolls associated with two support rolls. Intermediate cyclinders can also be interposed between the support cylinders and the working cylinders in a so-called sexto assembly.
  • the set of cylinders is placed between the two uprights of a rigid cage.
  • Each cylinder is carried by two chocks slidably mounted in windows provided on the two uprights of the cage and a clamping force is applied between the two support cylinders which determines the rolling of the product, for example by means of two jacks mounted on the cage and bearing, respectively, on the two chocks of a support cylinder, the other being blocked.
  • the means for controlling the passage of the product between the working rolls, alternately in one direction and then in the other, may consist, for example, of two roller tables placed on either side of the cage. Before rolling, the product is reheated in an oven placed next to the cage.
  • Such reversible rolling mills can be used, for example, as trimmers in a band train or in sheet metal from aluminum or steel.
  • the rolling is carried out from a blank such as a bloom or a slab having a significant thickness.
  • a blank such as a bloom or a slab having a significant thickness.
  • This can, for example, be 600 mm in the case of aluminum and 250 mm in the case of steel.
  • rolling is carried out by successive passes in one direction and then in the other, performing, with each pass, a reduction in thickness, the relative importance of which depends on the characteristics of the product such as the material of the metal. , its temperature and its thickness.
  • the product has, at the entry of the cage, a thickness greater than the spacing of the working rolls which therefore tend to crush it by producing a certain reduction in thickness .
  • the metal is thus applied to a circular sector of each cylinder lying between two horizontal planes corresponding to the external face of the product respectively at the inlet and at the outlet of the rolling mill.
  • the pinching of the product between the two cylinders determines its progress, at least one of the cylinders being driven in rotation. A certain pinching of the product is necessary to allow its entrainment.
  • an angle of attack A corresponding to the dihedral limited by the external face of the product and the plane tangent to the cylinder of the level where the latter comes into contact with the product.
  • the value of the angle of attack is therefore a function of the diameter of the cylinder and of the reduction in thickness produced, that is to say of the difference between the thickness of the product before it enters the rolling mill and the width of the air gap existing between the two working rolls.
  • the drive is carried out without difficulty insofar as the reduction in thickness is compatible with the torque and the force that can be exerted on the cylinders.
  • the friction is exerted only on the two lateral edges which come into contact respectively with the two cylinders and it is understood that the engagement cannot occur if the angle A is too important.
  • the object of the invention is to remedy all of these drawbacks as much as possible by means of a new process which makes it possible, with each pass, to achieve the optimal reduction in thickness, while avoiding shocks and refusals of engagement. .
  • the working cylinder is given, for the first start pass P1, a spacing e1 less than e2 determining an angle of attack A1 sufficiently reduced to avoid refusal of engagement and, after engagement, the spacing of the rolls is reduced to a value e2 such that the total reduction in thickness e0 - e2 remains compatible with the power and the maximum force of the rolling mill, then, for the second pass P2, the working cylinders are given a spacing e3 such that the difference e2 - e3 determines an angle of attack A2 sufficiently reduced to avoid a refusal of engagement and, after the engagement of the product, the spacing of the cylinders up to a value e4 determined so that the total reduction in thickness e1 - e4 is as large as possible while remaining compatible with the maximum power and force of the rolling mill and so on, the spacing of the working rolls being first adjusted, at the start of each pass P n , to a value e 2n-1 determining an angle of attack A
  • the thickness reduction is thus continued in two stages for each pass, as long as the thickness at the end of a pass risks determining a refusal of engagement for a reduction in the spacing of the working rolls on the next pass compatible with the rolling power and the rolling is then terminated in a normal manner.
  • the adjustment at each pass of the spacing of the cylinders will be carried out automatically by means of an automatic regulation system of the clamping force associated with a mathematical model programmed so as to calculate, at each pass, the reduction in thickness at perform in two stages, depending on the available torque, taking into account the mechanical and dimensional characteristics of the rolling mill and the product and the nature of the rolled metal.
  • the mathematical model is programmed so as to calculate, as a function of the foreseeable state of the product on each pass, taking into account the thickness reached in the previous pass and the number of passes previously carried out, the maximum reduction d possible thickness and tightening of the cylinders necessary for training without risk of refusal of engagement and that, at each pass P n , the product to be laminated having, over most of its length, a thickness e 2n-2 and, on its tail, a thickness e 2n-3 corresponding to the engagement in the previous pass P n-1 , the mathematical model determines, first of all, by taking into account the foreseeable physical and dimensional characteristics of the product during said pass P n and capacities of the rolling mill, the rolling thickness e 2n during said pass P n making it possible to obtain a maximum thickness reduction e 2n-3 - e 2n remaining compatible with the available power and the possible effort, and the spacing e 2n-1 of the cylinders allowing the introduction of the head of the strip without refusal of engagement, and the regulation system controls the introduction
  • Figure 1 shows schematically, in elevation, a quarto rolling mill.
  • Figure 2 shows the rolling process during the first pass, in two successive diagrams 2a, 2b.
  • Figure 2 shows the rolling process during the second pass, in two successive diagrams 2a, 2b.
  • Figure 4 shows the process during a pass P n .
  • Figure 5 is a flow diagram of the regulatory process.
  • FIG 1 there is shown schematically a conventional quarto type rolling mill comprising a cage 1 consisting of two spaced apart uprights 11 provided with windows 13 and between which are placed four cylinders, respectively two working cylinders 2 and 2 ′ and two cylinders d 'support 3 and 3 ′.
  • Each cylinder is carried at its ends by bearings mounted in chocks, respectively 21, 21 ′, 31, 31 ′, which slide along vertical guide faces 12 formed along the windows 13.
  • the chocks 21, 21 ′, working cylinders 2, 2 ′ are guided along the lateral faces of two hydraulic blocks 14, 14 ′, fixed on the faces 12, 12 ′, of each window 13 and in which are housed jacks making it possible to exert on the chocks 21, 21 ′, efforts of bending of the working rolls 2, 2 ′.
  • the cage is also provided with means for clamping the cylinders capable of clamping under load, for example hydraulic cylinders 4, which bear on each side on the chocks 31 of the support cylinder 3, the chocks 31 ′ of the other support cylinder 3 ′ resting on fixed stops.
  • the jacks 4 thus exert, in the vertical plane P passing through the axes of the cylinders, a clamping force which determines a bringing together of the two working cylinders 2, 2 ′.
  • the rolling technique which has been used since the beginnings of the steel industry, has been continuously improved, but particularly in recent years.
  • this technique is suitable for different working conditions, in particular the nature of the metal and the dimensions of the product to be laminated, in particular the thickness that one wishes to obtain.
  • the arrangement which we have just described is found in most rolling mills which can differ in the number and dimensions of the rolls as well as in the various ancillary devices.
  • the invention applies especially to a hot rolling mill of the reversible type used for the operation called "roughing".
  • a hot rolling mill of the reversible type used for the operation called "roughing".
  • the product 5 passes between the working rolls 2, 2 ′, alternately in one direction then in the other, that is to say with reference to FIG. 1, from left to right then from right to left and so on, the thickness reduction being carried out progressively by successive passes.
  • the cage 1 can be placed between two roller tables of the conventional type and which have therefore not been shown in the drawing.
  • the operation of the whole rolling mill and of the related devices is controlled and controlled by a regulation system 6 associated with a computer 60, which performs an automatic adjustment of the thickness of the product during rolling while taking account for all the mechanical and dimensional characteristics of the rolling mill.
  • FIG. 1 only shows, by way of example, an installation of this type equipped with a regulation system 6, 60, making it possible to adjust the hydraulic flow rate of supply to the jack at its inlet 41 according to the indications given by a measuring device 61 which is associated with the chock 31 of the support cylinder 3 and makes it possible to measure the position of the axis of the cylinder cylinder 3, and the assembly thus constitutes a digital loop for regulating the tightening position as a function of a spacing of the cylinders displayed on the input 62 of the regulation system 6.
  • the automatic regulation system 6 is associated, in addition, with a mathematical model 63 programmed so as to adjust the clamping force applied to the support cylinders as a function of the dimensions of the product, as well as the nature and condition of the metal, to effect an optimal thickness reduction corresponding to the possibilities of the rolling mill.
  • Figure 2 schematically illustrates the rolling process during the first pass P, called start.
  • FIG. 2a to the left of Figure 2, there is shown the end 50 of product 5 which comes into contact with the working rolls 2, 2 ′.
  • the product 5 has a gross thickness e0 and the air gap, limited by the generators 20, 20 ′, of the cylinders 2, 2 ′, lying in the clamping plane, has a width e1.
  • the mathematical model 63 associated with the regulation system 6 is programmed so as to calculate, with each pass, the maximum possible reduction in thickness compatible with the available power and the possible effort, taking into account, on the one hand, the characteristics of the rolling mill which determine its working capacity and its possible deformations and, on the other hand, the physical and dimensional characteristics of the product.
  • the effort to be exerted to determine a certain reduction in thickness depends on the nature of the metal and its thickness, but also on its temperature which rises during rolling. Thanks to its self-adaptation, the mathematical model 63 will be able to predict, for each pass and according to the operations already carried out, the state of the metal and the maximum reduction in thickness possible without risk of excessive stress on the rolling mill.
  • the model 63 can therefore also provide, according to the passes, the spacing of the cylinders determining a sufficient pinch for the entrainment of the product without risk of refusal of engagement.
  • the mathematical model 63 displays on input 62 of the regulator 6, first of all, the first clamping position setpoint making it possible to guarantee good engagement of the strip, taking into account the diameter of the cylinders and, then, during the pass, the thickness setpoint making it possible to obtain the optimal reduction calculated previously.
  • the mathematical model 63 is associated with the computer 60 which has in memory all the characteristics of the rolling mill 1 which must be taken into account to determine the reduction in thickness.
  • an initialization step 1 Before starting the rolling of a determined product, in an initialization step 1, all the specific parameters of the product to be laminated, and corresponding, in particular, to the nature of the metal, are displayed on an input 64 of the mathematical model 63 the initial dimensions, the target dimensions and the temperature measured before the operation.
  • the mathematical model 63 determines, on the one hand, the maximum possible thickness reduction allowing, from the gross thickness e0, to obtain an optimal thickness e2 and, on the other hand, the spacing e1 of the cylinders which guarantees good engagement of the product 5, taking into account the gross thickness e0 and the diameters d of the cylinders 2, as well as the lubrication conditions.
  • This engagement is carried out at reduced speed with pinching of the product 5, the thickness of which is reduced to e1 between the cylinders 2, 2 ′.
  • the regulating device 6 controls the tightening of the rolls up to the spacing e2 calculated previously and then the transition to rolling speed.
  • the product On leaving the rolling mill, the product therefore has, over most of its length and up to its downstream end 54, a thickness e2, excluding the head 50 which has a greater thickness e1.
  • the first start pass P1 which, as indicated by an arrow in Figure 2, was carried out from left to right, is then completed, product 5 being on the right of cylinders 2 and 2 ′.
  • the second rolling pass P2 is then carried out according to the process indicated in FIG. 3, that is to say from right to left.
  • the mathematical model 63 first of all determines, in a step 3, the optimum thickness e4 that can be obtained, which corresponds to the maximum reduction in thickness possible compatible with the capacities of the rolling mill, taking into account since the tail of the product is thicker, the reduction to be made is equal to e1 - e4. Then, in a step 4, the mathematical model determines the spacing e3 which it is necessary to give to the cylinders to allow the introduction of the product without refusal of engagement, taking into account the thickness of the product and its temperature predictable at this time.
  • the product 5 then engages between the cylinders 2 and 2 ′, taking the thickness e3. As soon as the engagement is ensured, the regulation system 6 controls the tightening of the rolls at the spacing e4 and the transition to rolling speed.
  • the rolled product at the end of this second pass P2 therefore has a thickness e4 on most of its length 56 and a head 55 of thickness e3.
  • the process described above for the second pass P2 can therefore be repeated on each pass until the ratio between the diameter d of the working rolls which remains substantially fixed and the thickness of the product which decreases with each pass is such that, by immediately carrying out the maximum thickness reduction compatible with the rolling power, there is no risk of a refusal of engagement.
  • the target thickness is (e)
  • the thickness reached e 2n is compared with the parameter e + x and, as soon as it becomes less than this parameter, the process described above is stopped and the rolling continues normally, in a step 7, until the desired thickness (e) is obtained.
  • the invention is not limited to the details of the embodiment which has just been described by way of simple example and which could give rise to variants.
  • the system has been described in the context of a quarto rolling mill, but it is applicable in the same way to a duo or a sexto or to any other type of rolling mill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Laminated Bodies (AREA)
EP19910401892 1990-07-12 1991-07-08 Umkehrbares Walzverfahren Expired - Lifetime EP0466570B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9008910A FR2664510B1 (fr) 1990-07-12 1990-07-12 Procede de laminage reversible.
FR9008910 1990-07-12

Publications (2)

Publication Number Publication Date
EP0466570A1 true EP0466570A1 (de) 1992-01-15
EP0466570B1 EP0466570B1 (de) 1995-05-24

Family

ID=9398658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910401892 Expired - Lifetime EP0466570B1 (de) 1990-07-12 1991-07-08 Umkehrbares Walzverfahren

Country Status (5)

Country Link
EP (1) EP0466570B1 (de)
CA (1) CA2046803C (de)
DE (1) DE69109945T2 (de)
ES (1) ES2072568T3 (de)
FR (1) FR2664510B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996025251A1 (de) * 1995-02-14 1996-08-22 Sundwiger Eisenhütte Maschinenfabrik Gmbh & Co. Verfahren und vorrichtung zum auswalzen der enden eines aufgewickelten bandes in einem reversierwalzwerk
WO1997027954A1 (de) * 1996-01-30 1997-08-07 Mannesmann Ag Verfahren zum walzen von warmband, insbesondere warmbreitband
CN105436210A (zh) * 2015-12-11 2016-03-30 东北大学 一种中厚板轧机的变厚度轧制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2279938C2 (ru) * 2004-09-06 2006-07-20 Елена Евгеньевна Никитина Способ транспортировки длинномерных объектов через вакуумную камеру и устройство для его осуществления
DE102016106421A1 (de) 2016-04-08 2017-10-12 Andrey Senokosov Reinigungsverfahren für Steigrohre und Einrichtung hierfür

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177346A (en) * 1959-11-06 1965-04-06 United Steel Companies Ltd Apparatus for use in controlling a rolling mill
JPS5614004A (en) * 1979-07-16 1981-02-10 Mitsubishi Heavy Ind Ltd Rolling method for metallic sheet
SU825211A1 (ru) * 1978-05-10 1981-04-30 Gni I Pi Metall Promy Способ гор чей прокатки заготовок
SU1013006A1 (ru) * 1981-07-29 1983-04-23 Куйбышевский Ордена Трудового Красного Знамени Политехнический Институт Им.В.И.Ленина Способ реверсивной прокатки полос
JPS60102208A (ja) * 1983-11-07 1985-06-06 Kawasaki Steel Corp 板の可逆圧延方法
JPS6127102A (ja) * 1984-07-16 1986-02-06 Nippon Steel Corp 金属スラブの熱間幅圧延方法
JPS61129210A (ja) * 1984-11-27 1986-06-17 Kawasaki Steel Corp 厚板圧延における鼻曲り防止方法
US4608850A (en) * 1985-09-12 1986-09-02 Aluminum Company Of America Alligator defect elimination
JPS6254505A (ja) * 1985-08-31 1987-03-10 Nippon Steel Corp 差厚鋼板の製造方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177346A (en) * 1959-11-06 1965-04-06 United Steel Companies Ltd Apparatus for use in controlling a rolling mill
SU825211A1 (ru) * 1978-05-10 1981-04-30 Gni I Pi Metall Promy Способ гор чей прокатки заготовок
JPS5614004A (en) * 1979-07-16 1981-02-10 Mitsubishi Heavy Ind Ltd Rolling method for metallic sheet
SU1013006A1 (ru) * 1981-07-29 1983-04-23 Куйбышевский Ордена Трудового Красного Знамени Политехнический Институт Им.В.И.Ленина Способ реверсивной прокатки полос
JPS60102208A (ja) * 1983-11-07 1985-06-06 Kawasaki Steel Corp 板の可逆圧延方法
JPS6127102A (ja) * 1984-07-16 1986-02-06 Nippon Steel Corp 金属スラブの熱間幅圧延方法
JPS61129210A (ja) * 1984-11-27 1986-06-17 Kawasaki Steel Corp 厚板圧延における鼻曲り防止方法
JPS6254505A (ja) * 1985-08-31 1987-03-10 Nippon Steel Corp 差厚鋼板の製造方法
US4608850A (en) * 1985-09-12 1986-09-02 Aluminum Company Of America Alligator defect elimination

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996025251A1 (de) * 1995-02-14 1996-08-22 Sundwiger Eisenhütte Maschinenfabrik Gmbh & Co. Verfahren und vorrichtung zum auswalzen der enden eines aufgewickelten bandes in einem reversierwalzwerk
US6014882A (en) * 1995-02-14 2000-01-18 Sundwiger Eisenhutte Maschinenfabrik Gmbh Process and device for rolling out the ends of a coiled strip in a reversing rolling mill
WO1997027954A1 (de) * 1996-01-30 1997-08-07 Mannesmann Ag Verfahren zum walzen von warmband, insbesondere warmbreitband
CN105436210A (zh) * 2015-12-11 2016-03-30 东北大学 一种中厚板轧机的变厚度轧制方法

Also Published As

Publication number Publication date
CA2046803A1 (fr) 1992-01-13
DE69109945T2 (de) 1995-11-02
FR2664510A1 (fr) 1992-01-17
ES2072568T3 (es) 1995-07-16
DE69109945D1 (de) 1995-06-29
EP0466570B1 (de) 1995-05-24
CA2046803C (fr) 2000-08-29
FR2664510B1 (fr) 1995-02-24

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