EP0061539A1 - Verfahren der Regelung für ein mehradriges Walzwerk - Google Patents

Verfahren der Regelung für ein mehradriges Walzwerk Download PDF

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Publication number
EP0061539A1
EP0061539A1 EP19810301316 EP81301316A EP0061539A1 EP 0061539 A1 EP0061539 A1 EP 0061539A1 EP 19810301316 EP19810301316 EP 19810301316 EP 81301316 A EP81301316 A EP 81301316A EP 0061539 A1 EP0061539 A1 EP 0061539A1
Authority
EP
European Patent Office
Prior art keywords
roll
strand
roll stand
strands
rolling
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
EP19810301316
Other languages
English (en)
French (fr)
Other versions
EP0061539B1 (de
Inventor
Koichi Ohba
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to EP19810301316 priority Critical patent/EP0061539B1/de
Priority to DE8181301316T priority patent/DE3168723D1/de
Publication of EP0061539A1 publication Critical patent/EP0061539A1/de
Application granted granted Critical
Publication of EP0061539B1 publication Critical patent/EP0061539B1/de
Expired legal-status Critical Current

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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
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B2013/006—Multiple strand rolling mills; Mill stands with multiple caliber rolls

Definitions

  • This invention relates to a control method for a multi-strand rolling mill, and more particularly to such a method responsive to at least one workpiece strand leaving or entering a roll stand serving to roll simultaneously a plurality of strands to remove the influence of the strand leaving or entering the stand on the remaining strands both in that roll stand and in the following roll stands.
  • FIG. 1 of the accompanying drawings there is illustrated the essential portion of a roll stand for rolling a pair of workpiece strands simultaneously.
  • the arrangement illustrated comprises a pair of upper and lower working rolls 10 and 12 arranged one above the other to form a roll gap therebetween.
  • Each of the upper and lower rolls 10 and 12 includes a plurality of axially spaud forming grooves, in this case, two grooves extending circumferentially around the entire surface thereof opposite those on the other roll.
  • Each of the opposed pair of grooves have a cross section substantially complementary to that of a workpiece strand to be rolled.
  • FIG. 1 a pair of workpiece strands 14 and 16 are shown in cross section as being sandwiched between the opposite forming grooves on the upper and lower rolls 10 and 12 respectively with a small spacing therebetween.
  • the lower roll 12 includes a pair of shafts protruding from both sides thereof and extending rotatably through the opposite lateral walls of a housing 18.
  • the upper roll 10 includes a pair of similar shafts extending not only rotatably but also movable toward and away from the lower roll 12 under the control of screw-down devices 20 and 22 disposed in the upper portions of the opposite walls of the housing 18 on the working and driving sides respectively.
  • the screw-down devices may be of the electrically operated type or the oil pressure type but they are generally of the manually operated type with rolling mills rolling a plurality of strands simultaneously.
  • the roll gap between the upper and lower rolls 10 and 12 is variable in accordance with their loading as shown in Figure 2.
  • the upper and lower rolls 10 and 12 respectively are located at thier positions shown by the horizontal lines 26 and 24 in Figure 2 to maintain therebetween a roll separation S o equal to a magnitude determined by the particular rolling schedule.
  • the lower roll 12 is fixed to its position shown by the lower horizontal line 24.
  • the upper roll 12 With a pair of workpiece strands 14 and 16 simultaneously sandwiched between the two rolls 12 and 14 as shown in Figure 1, the upper roll 12 is located at its position as shown by the horizontal line 28 in Figure 2. However with only the strand 16 on the driving side disposed between the two rolls 10 and 12, the upper roll 10 can be located at its position shown by the tilted line 30 in Figure 2.
  • the rolling speed on each roll stand arranged in a tandem arrangement in a rolling mill has been preliminarily set to a magnitude determined by a rolling pass schedule and a pair of screw-down device on each side of each roll stand have been manually operated to set a roll gap between the mating upper and lower working rolls to the magnitude determined by that schedule.
  • each workpiece path along which the strands travel may include a gap between the trailing end of one strand and the leading end of the next.
  • the roll stand as whon in Figure 1 may change from its state in which both the strans 14 and 16 are being simultaneously rolled to the state in which only either one of these strands is being rolled.
  • a plurality of roll stands are disposed in tandem i.e. one after the other to roll simultaneously, for example, a pair of strands and are followed by a pair of branched arrays of roll stands disposed in tandem one for each workpiece each to roll only the associated workpiece.
  • Each of the roll stands for rolling simultaneously the pair of strand workpieces includes a pair of upper and lower working rolls as described above and each of the roll stands in the branched arrays includes a pair of upper and lower working rolls differeing from those described above only in that in the former stand a single forming groove is disposed on each working roll.
  • the present invention seeks to provide a method of controlling a multi-strand rolling mill so that the roll gap is always correctly maintained on any roll stand disposed in the rolling mill to roll simultaneously a plurality of strand workpieces regardless of whether or not at least one of the strands is present in that roll stand.
  • the present invention also seeks to provide a method of controlling a multi-strand rolling mill comprising a plurality of roll stands disposed in tandem so-that, when at least one of a plurality of strands leaves or enters any one of the roll stands rolling simultaneously the strands, constant mass flow of the strands is maintained throughout the rolling mills.
  • the present invention provides a method of controlling a multi-strand rolling mill for rolling simultaneously a plurality of workpiece strands, comprising the steps of tracing the positions of the tailing end and the leading end of each of a plurality of strands, and controlling the roll gap of a roll stand simultaneously with the trailing or leading end of at least one workpiece strand leaving or entering the roll stand.
  • the present invention provides a method of controlling a multi-strand rolling mill comprising a plurality of stands disposed in tandem to roll simultaneously a plurality of workpiece strands, comprising the stps of tracing the trailing end and the leading end of each of a plurality or strands and each time at least one strand passes through each of the roll stands, adjusting the rolling speeds of the roll stands upstream of roll stand through which the end of said at least one strand passes, the rolling speed of the last-mentioned roll stand and the rolling speed of the roll stands downstream of the latter roll stand to a speed ratio maintaining a constant mass flow of the strands throughout the multi-strand rolling mill.
  • control method may render the speed ratio equal to: where b 1 and f 1 designate the rate of backward slip and the rate of forward slip on the roll stand through which the end of said at least one strand passes when all the strands are present in the last-mentioned roll stand and b2 and f2 designate the rate of backward slip and the rate of forward slip on the last-mentioned roll stand when the end of said at least one strand has passed through the last-mentioned roll stand.
  • the roll gap at the position of the strand 16 is determined by the roll gap between the upper and the lower roll designated by the upper and lower solid circle 38 and 40 respectively. That roll gap corresponds to the separation (S o + S D ) shown in Figure 2.
  • the strand 16 is entered at an entry speed V E2 into that roll opening and rolled into a strand 42. Then the rolled strand 42 leaves the roll gap at a delivery speed V D2 .
  • the upper and lower working rolls have a common speed of rotation remaining unchanged regardless of whether or not a workpiece 14 is present between the working rolls.
  • the rolled strand 42 has a ratio of its delivery speed to the circumferential speed of the roll (which is called hereinafter the rate of forward slip) larger than that of the rolled strand 36 because the rolls have more screwed down the strand 42 than the strand 36. Therefore at the outgoing side of the rolls the strand 36 travels at a lower speed than the strand 42. That is, V D1 ⁇ V D2 holds.
  • the entry speed V E1 is higher than that V E2 due to the change in rate of backward slip which implies a ratio of the entry speed of the strand to the circumferential speed of the working roll.
  • Figure 4 shows a multi-strand rolling mill.
  • the arrangement illustrated comprises a pair of roll stands 44 and 46 disposed in tandem to roll a pair of workingpi ece strand, A and B simultaneously and a pair of branched arrays each including two roll stands 48 and 50 or 49 and 51 disposed in tandem to roll only an associated one of the strands A or B.
  • the workpiece A is being rolled on the roll stands 44, 46, 48 and 50 while it travel along loops 52 and 54 netween the roll stands 46 and 48 and between the roll stands 48 and 50 respectively.
  • the workpiece A leaves the roll stand 50 as shown by the arrow 56 in Figure 4.
  • the strand B is shown in Figure 4 as having just left the roll stand 46 and forming similar loops 53 and 55 between the roll stands 46 and 49 and between the roll stands 49 and 51 respectively. Then the workpiece B leaves the roll stand 51 as shown at the arrow 56 in Figure 4.
  • the roll stands 44, 46, 48, 49, 50 and 51 have respectively rolling speeds or speeds of the rolls as determined so that each of the roll stands is equal in mass flow in unit time of the workpiece A or B to other roll stands.
  • the workpiece B has already left the roll stand 46 and therefore the delivery speed of the strand workpiece A increases to V D2 from V D1 while at the same time the entry speed thereof decreases to V E2 from VE1 as described above in conjunction with Figure 3.
  • the strand A has a mass flow which is not kept constant throughout the arrangement of Figure 4.
  • the present invention contemplates to maintain a constant roll separation on any roll stand disposed in a multi-strand rolling mill to roll simultaneously a plurality of strand workpieces at-the position of each of the strand workpieces being rolled regardless of whether or not at least one strand workpiece leaves or enters that roll stand.
  • each of the manual screw-down devices 20 or 22 as shown in Figure 1 is replaced by a remotely actuatable, fast response screw-down device such as an electrically operated or an oil pressure screw-down device and there is provided tracing means for tracing the position of the leading and trailing end of each of the workpiece strands. Simultaneously with the sensing of the trailing or leading end of at least one of the strand workpieces leaving or entering a roll stand, a roll opening on that roll stand is controlled through the screw-down devices disposed on the latter.
  • a remotely actuatable, fast response screw-down device such as an electrically operated or an oil pressure screw-down device and there is provided tracing means for tracing the position of the leading and trailing end of each of the workpiece strands.
  • the roll gap can be maintained constant at the rolling position of the strand workpiece on the driving side regardless of the presence or absence of the workpieces on the working side.
  • the upper roll may occupy its position as shown at line 28 in Figure 5 with a satisfactory result.
  • it is essential to maintain a roll operation at the rolling position on the side of that strand workpieces continuously rolled, at a constant magnitude ( S DW + So).
  • the roll opening has increased or decreased simultaneously with the strand leaving or entering the roll stand, but this entering or leaving consumes some time interval. Therefore the increase or decrease in roll gap is preferably equal in time interval to the entering or leaving of the strand.
  • the present invention has been described by using the expressions formulated by way of example, with the positions of the strand workpieces under rolling bilaterally symmetric about a central control section of an associated working roll perpendicular to the longitudinal axis thereof but it is to be understood that the present invention is equally applicable to those positions bilaterally asymmetric about that central section. In the latter case the fundamental point of view is similar to that described about in conjunction with the symmetric positions of the strands under rolling excepting that controlled magnitudes are different from those described above.
  • the present invention contemplates to maintain a constant mass flow throughout a multi-strand rolling mill comprising a plurality of roll stands disposed in tandem to roll simultaneously a plurality of strand workpiece even then at least one of the strand workpieces leaves or enters one of the roll stands.
  • each of the upper and lower rolls is rotated at a constant circumferential speed or a constant rolling speed V R and each of the plurality of strands has an entry speed V E1 and a delivery speed V D1 with the large roll gap or in the presence of all the strand workpieces on the rolls as well as an entry speed V E2 and a delivery speed V D2 with the small roll gap or in the absence of at least one strand workpieces on the rolls as described above.
  • the measure to change the rolling speed on each of all the upstream roll stands alone is arranged to maintain the speeds on all the downstream roll stands constant although those speeds should actually change by a factor as defined by the expression (12). From this it will readily be understood that it is required only to multiply the speeds on all the upstream roll stands including the roll stand 46 by the reciprocal of.the factor defined by the expression (12).
  • the present invention has been illustrated and described in conjunction with a control method comprising steps of tracing the trailing and leading end of each of the strands, sensing the trailing or leading end of either one thereof leaving or entering one of roll stands and changing the speed ratios of the roll stands disposed upstream or downstream of that roll stand or all the roll stands simultaneously with the sensing of the associated workpiece, it is to be understood that it is essential to change the rolling entry, delivery speeds on the roll stands upstream of that roll stand changed in number of strand workpieces being roll, and last-mentioned roll stand and those downstream thereof following a speed ratio
  • the present invention has been described in conjunction with ratios with which the rolling speeds are changed on the respective roll stands, but it is noted that at least one of the strands does not leave or enter the roll stand instantaneously but that it leaves or enters the roll stand within a constant time interval as determined by the speeds thereof, the diameter of the working rolls and screwdown rate on that roll stand. As a result, it has been found that the more satisfactory result is given by making substantially equal the time interval over which the speeds are changed to the constant time interval as described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
EP19810301316 1981-03-26 1981-03-26 Verfahren der Regelung für ein mehradriges Walzwerk Expired EP0061539B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19810301316 EP0061539B1 (de) 1981-03-26 1981-03-26 Verfahren der Regelung für ein mehradriges Walzwerk
DE8181301316T DE3168723D1 (en) 1981-03-26 1981-03-26 Control method for multi-strand rolling mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810301316 EP0061539B1 (de) 1981-03-26 1981-03-26 Verfahren der Regelung für ein mehradriges Walzwerk

Publications (2)

Publication Number Publication Date
EP0061539A1 true EP0061539A1 (de) 1982-10-06
EP0061539B1 EP0061539B1 (de) 1985-02-06

Family

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Family Applications (1)

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EP19810301316 Expired EP0061539B1 (de) 1981-03-26 1981-03-26 Verfahren der Regelung für ein mehradriges Walzwerk

Country Status (2)

Country Link
EP (1) EP0061539B1 (de)
DE (1) DE3168723D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103658193A (zh) * 2012-08-30 2014-03-26 宝山钢铁股份有限公司 交叉布置式两辊连轧机架孔型抬高方法
WO2018039719A1 (en) * 2016-08-30 2018-03-08 Schmacker Investments Pty Ltd Wire member and method of making wire member

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2933956A (en) * 1958-01-30 1960-04-26 United States Steel Corp Automatic screwdown-control system for rod mill
DE1427959A1 (de) * 1963-03-08 1968-11-28 Morgan Construction Co Vorrichtung zur Dickenregelung bei mehradrigen Tandem-Walzwerken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2933956A (en) * 1958-01-30 1960-04-26 United States Steel Corp Automatic screwdown-control system for rod mill
DE1427959A1 (de) * 1963-03-08 1968-11-28 Morgan Construction Co Vorrichtung zur Dickenregelung bei mehradrigen Tandem-Walzwerken

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103658193A (zh) * 2012-08-30 2014-03-26 宝山钢铁股份有限公司 交叉布置式两辊连轧机架孔型抬高方法
CN103658193B (zh) * 2012-08-30 2015-09-23 宝山钢铁股份有限公司 交叉布置式两辊连轧机架孔型抬高方法
WO2018039719A1 (en) * 2016-08-30 2018-03-08 Schmacker Investments Pty Ltd Wire member and method of making wire member
US11033910B2 (en) 2016-08-30 2021-06-15 Schmacker Investments Pty Ltd. Wire member and method of making wire member

Also Published As

Publication number Publication date
EP0061539B1 (de) 1985-02-06
DE3168723D1 (en) 1985-03-21

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