EP1781429B1 - Verfahren zum richten eines metallbandes und richtmaschine - Google Patents

Verfahren zum richten eines metallbandes und richtmaschine Download PDF

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Publication number
EP1781429B1
EP1781429B1 EP05777248A EP05777248A EP1781429B1 EP 1781429 B1 EP1781429 B1 EP 1781429B1 EP 05777248 A EP05777248 A EP 05777248A EP 05777248 A EP05777248 A EP 05777248A EP 1781429 B1 EP1781429 B1 EP 1781429B1
Authority
EP
European Patent Office
Prior art keywords
straightening
metal strip
force
thickness
carried out
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.)
Revoked
Application number
EP05777248A
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German (de)
English (en)
French (fr)
Other versions
EP1781429A1 (de
Inventor
Hans Georg Hartung
Andreas Gramer
Ralf-Hartmut Sohl
Peter De Kock
Bodo Falkenhahn
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35058992&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1781429(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to PL05777248T priority Critical patent/PL1781429T3/pl
Publication of EP1781429A1 publication Critical patent/EP1781429A1/de
Application granted granted Critical
Publication of EP1781429B1 publication Critical patent/EP1781429B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling

Definitions

  • the invention relates to a method for straightening a metal strip which is conveyed in a conveying direction by a straightening machine, wherein in the straightening machine, the metal strip is applied by a number straightening rollers in the direction normal to the surface of the metal strip with a straightening force, wherein before Entry of the metal strip in the straightening machine, the thickness of the metal strip is determined and the employment of straightening rolls in the direction normal to the surface of the metal strip in dependence of the determined thickness, wherein on the outlet side of the straightening machine, a measurement takes place, with the buckling tendency and a deviation of the directed metal strip is determined from the ideal line in the direction normal to the surface of the metal strip, and wherein the employment of the leveling rolls in the direction normal to the surface of the metal strip depending on the bulge and the deviation is such that the metal strip after Richtvorg ang is as level as possible.
  • the quality of the band treatment and that of the band as such depends on how well it succeeds in planning the first rolled up band, ie. H. to bring flat state.
  • straightening machines which bring the initially uneven incoming band by applying the belt with a number of straightening rollers in a plane band condition.
  • the straightening machine designed as a roll straightening machine, usually three to seven rolls or rolls are used.
  • the upper leveling rolls are adjustable or adjustable normal to the surface of the metal strip.
  • electric actuators or mechanical Spindelhubsysteme occasionally also eccentric used.
  • a method of the type mentioned is from the DE 21 17 489 A1 known.
  • a metal strip is fed to a straightening machine, where it is directed so that it leaves as possible just the machine again.
  • the thickness of the sheet is measured.
  • a displacement measuring device is provided, with which the deflection of the metal strip in the direction normal to the belt surface can be measured. This results in a measure of the flatness of the band.
  • the EP 1 275 446 A2 discloses a method for eliminating transverse curvatures of a metal strip in a strip processing line with a strip handling device to be traversed by the metal strip.
  • the transverse curvature is detected in a band process line area and eliminated by means of a correction roller that can be set in its immersion depth.
  • the elimination of the transverse curvature occurs in a belt process line region immediately before the belt treatment device.
  • a method for determining a position control amount of a straightening roller for correcting flatness deviations of a metal strip in a straightening machine is known.
  • the method described provides that actual coefficients of a shape function suitable for displaying the strip shape are first determined from recorded values of the flatness deviations of the strip. Then, target coefficients are determined from these actual coefficients. Finally, the target coefficients are converted into position control variables for the straightening roller.
  • the DE 38 40 016 A1 discloses a method for straightening metal straps, wherein the straightening forces are measured at least on one of the straightening rollers of a roller straightening machine and the straightening roller positions are adjusted as a function of the measured values. It is envisaged here that each straightening force acting perpendicular to the axes of rotation of the straightening rollers or the roller bearings or to the frame of the straightening machine is measured individually and that the straightening rollers are adjusted automatically in the region of the occurring varying pressure forces as a function of these measured values.
  • the DE 33 08 616 C2 is based on a method for straightening metal strips, in which the metal strip between top and bottom staggered straightening rolls promoted and is bent alternately with decreasing degree of deformation alternately, wherein the straightening rollers according to the sheet metal cross section and the Blechselnfestmaschine in the sense of a given degree of deformation against each other are adjustable.
  • a previously unthought problem is that although the material properties of the metal strip to be straightened are taken into account, however, due to thickness variations of the strip, sometimes no satisfactory straightening result is achieved. Straightening is problematic, especially in the case of non-rolled-out strip ends, since the beginning of the strip or the strip end has a large fluctuation in the strip thickness. In some cases, there are wedge-shaped or even step-shaped thickness profiles over the longitudinal axis of the metal strip, so that a reproducible leveling process can only be achieved with great difficulty.
  • the invention is therefore based on the object to provide a method of the type mentioned, in which it is possible in a simple manner to overcome the above disadvantage, d. H. ensure a high-quality directional result even in the case of large variations in the thickness of the metal strip along its longitudinal axis.
  • the solution of this problem by the invention is characterized in that the determination of the bulge tendency and the deviation is effected by a force measurement.
  • the thickness measurement can be carried out in a simple manner, it is advantageously carried out at a sufficient distance in front of the leveling rolls. Therefore, a development provides that the employment of the straightening rollers is time-controlled taking into account the distance of the measurement of the thickness before the straightening rollers and the conveying speed of the metal strip in the conveying direction. About the distance of the measurement before the rollers and the conveying speed so a dead time is determined, which is taken into account in the regulation of the employment of the rollers.
  • the force measurement is advantageously carried out by a straightening roller arranged on the outlet side.
  • An alternative solution provides that the force is measured by one or more to the straightening rollers separate touch rollers.
  • a further improvement of the method according to the invention can be achieved by measuring the size of the straightening force applied by the straightening rolls during the straightening process in the straightening machine and the adjustment of straightening rolls in the direction normal to the surface of the metal strip - also - depending on the measured straightening force , It is thus possible to achieve a comparison of the material-dependent desired-actual force.
  • the conveying direction can be reversed if necessary. This may be useful if the straightened band behind the leveler does not meet the desired flatness requirements.
  • the adjustment values between the inlet side of the straightening machine and the outlet side of the straightening machine are mirrored so that in the reverse conveying direction the adjustment values correspond to the conveying direction.
  • the beginning of the tape can be directed a second time in the reverse direction so that it comes to rest with an optimized directional result on the inlet side of the leveler.
  • a third time can be directed again in the forward direction or the beginning of the tape can be continued by the open machine.
  • Positionally controlled adjusting elements are preferably provided which are suitable for setting the leveling rolls in the direction normal to the surface of the metal strip. It is provided with particular advantage that the position-controlled adjusting elements are designed as hydraulic piston-cylinder systems.
  • means for measuring the bowing tendency and the deviation of the directional metal strip from the ideal line in the direction normal to the surface of the metal strip may be provided, which are arranged on or in the conveying direction behind the outlet of the metal strip from the leveler. These means can be formed by one or two (above, below) to the straightening rollers separate touch rollers.
  • the invention makes it possible to achieve a very good directional result, even with strongly varying thickness of the metal strip to be straightened, which improves the overall quality of the produced metal strip or makes the production of the strip easier and more reliable.
  • FIGS. 1 a and 1b are side views of a metal strip 1 to be subjected to a straightening process. Shown is the area of the beginning of a tape Vietnameseausalzten band. It is typical that the thickness d of the metal strip 1 over the longitudinal axis of the strip, which corresponds to the conveying direction R, is not constant. In Fig. 1a it is the case to see that the metal band 1 is wedge-shaped. Fig. 1 b shows the case of a stepwise thickness of the band 1.
  • the metal strip 1 is conveyed in the directional machine 2 in the conveying direction R at a constant speed v.
  • the straightening machine 2 is designed as a roller straightening machine and has a number of straightening rollers 3.
  • the four lower and three upper straightening rollers 3 are each arranged on a carrier 15 and 16. Both carriers can be moved relative to each other in the direction N normal to the surface of the metal strip 1.
  • the lower carrier 16 is arranged stationary, while the upper carrier 15 can be moved in the direction N over a position-controlled adjusting element 8 in the form of a hydraulic piston-cylinder system.
  • the adjusting movement of the straightening rollers 3 is designated by a.
  • the force designated F acts between the rollers, causing a deformation of the metal strip 1, so that after leaving the leveler 2, the metal strip 1 has a high degree of planeness.
  • the metal strip 1 behind the outlet 4 of the straightening machine 2 takes the form shown by solid lines (ideal line).
  • the metal strip 1 has a bulging tendency which is expressed in a deviation x from the ideal line - either upwards or downwards - as indicated by the dashed lines.
  • a means 6 for measuring the thickness d of the metal strip is arranged in the form of a suitable sensor known per se.
  • the distance - measured in the conveying direction R - between the sensor 6 and the center of the straightening rollers is denoted by b.
  • the sensor 6 measures the thickness d of the metal strip 1 and forwards the measured value to a control device 9.
  • the employment a of the upper to the lower straightening rollers 3 by the adjusting element 8 takes place as a function of the measured thickness d.
  • the dead time is taken into account, which passes until the metal strip 1 has moved from the place of measurement to the location of the straightening rollers 3. The dead time is easily determinable with knowledge of the distance b and the conveying speed v.
  • a corresponding algorithm is stored in the control 9 for this purpose, or it is closed on the basis of stored waveforms on the correct and appropriate value of the yield strength and thus the employment a, which is set via the control element 8 becomes.
  • a sensing roller 5 is arranged, which detects the deviation x of the metal strip 1 of the ideal position.
  • the measured deviation value is likewise passed to the controller 9, which corrects the position a by means of its internally stored algorithms or curve profiles. Instead of a separate feeler roller 5, this measurement can be done with the last in the conveying direction R straightening roller 3 '.
  • Fig. 3 is the rough control concept for the regulated delivery a of the straightening rollers 3 to see.
  • the control device 9 receives the measured thickness d of the metal strip 1 from the sensor 6 as an input parameter. In addition, it is also fed the straightening force F, which is determined by a force or pressure cell 10. As a further input variable receives the control device 9 at the outlet. 4 the straightening machine 2 measured deviation x of the metal strip 1 from the ideal line, measured in the direction N normal to the surface of the metal strip 1. It is further indicated that the control device 9 has available tape data D which are stored in a database 17.
  • the force or pressure cell 10 detects the force acting in the hydraulic actuators 8 pressure p, which can be converted via a converter 14 in the straightening force.
  • Band data D are stored in the database 17, ie, for example, information about optimum deformation values for defined materials that make up the metal band 1.
  • An optimal reference value for the straightening force can be compared from the database 17 with the measured value, which takes place at the subtractor 18.
  • the difference signal is processed and then fed via a limiter 12 to another subtractor 19.
  • the power controller 11 may be designed to achieve various operating conditions and switched off, z. B. by a force regulator 11 associated switches.
  • the difference signal is fed to the controller 13, which outputs a control value for the position a to the control elements 8.
  • the optimum yield point is determined in the area of the database 17 shown on the left and transmitted to the area of the database 17 shown on the right. Based on stored data or stored algorithms, the required position a and straightening force F relative to the width B of the metal strip 1 (transverse to the conveying direction R) can be determined as a function of the thickness d.
  • This value is fed to a controller 21, behind which the actual straightening force F Ist is subtracted at a subtraction point. This is determined by the force or pressure cell 10 and the converter 14. The difference value is fed to the controller 22, which passes its signal via the limiter 12 to a subtraction point 23.
  • the target value for the employment a comes from the database 17 and passes through a controller 24 equally to the subtraction point 23. There also enters the measured value for the current employment a. The difference of the signal is fed to the (main) controller 13, which ejects the control value for the position a and sends it to the control elements 8.
  • a continuous strip thickness measurement takes place, the result of which is passed via the explained control system to position-controlled hydraulic cylinders.
  • the actual strip thicknesses are detected by the thickness measuring sensor 6 and the necessary adjustment values are provided by the position-controlled hydraulic cylinders.
  • the closed loop ensures a continuous adjustment of straightening rollers, eliminating the influence of strip thickness.
  • a result-oriented control method is used insofar as also the outlet-side deviation from the ideal position is detected. From the measurement of the deviation or the pressurization of the force or pressure cell 10, a conclusion can be made, as the readjustment must be made to again set an optimal straightening result. Thus, a largely arc-free outlet of the metal strip 1 is achieved from the leveler 2. Furthermore, the contact pressure is detected in the hydraulic cylinders. This pressure allows conclusions to be drawn about the material properties, especially if the strip thickness is known. These data can also be evaluated for position control and integrated into the control loop.
  • the adjustment values and their courses are collected in the database 17 and can thus be used to preset the straightening machine 2 when straightening another metal strip 1 or when starting a new installation as start values.
  • any other sensors can be used, for. B. optical encoder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Control Of Metal Rolling (AREA)
  • Wire Processing (AREA)
  • Coating With Molten Metal (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP05777248A 2004-08-28 2005-08-16 Verfahren zum richten eines metallbandes und richtmaschine Revoked EP1781429B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05777248T PL1781429T3 (pl) 2004-08-28 2005-08-16 Sposób prostowania taśmy metalowej i prostowarka

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004041732A DE102004041732A1 (de) 2004-08-28 2004-08-28 Verfahren zum Richten eines Metallbandes und Richtmaschine
PCT/EP2005/008899 WO2006024393A1 (de) 2004-08-28 2005-08-16 Verfahren zum richten eines metallbandes und richtmaschine

Publications (2)

Publication Number Publication Date
EP1781429A1 EP1781429A1 (de) 2007-05-09
EP1781429B1 true EP1781429B1 (de) 2008-07-16

Family

ID=35058992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05777248A Revoked EP1781429B1 (de) 2004-08-28 2005-08-16 Verfahren zum richten eines metallbandes und richtmaschine

Country Status (17)

Country Link
US (1) US7530250B2 (es)
EP (1) EP1781429B1 (es)
JP (1) JP4781361B2 (es)
KR (1) KR101141949B1 (es)
CN (1) CN100418656C (es)
AT (1) ATE401144T1 (es)
AU (1) AU2005279410B2 (es)
BR (1) BRPI0514803A (es)
CA (1) CA2578152C (es)
DE (2) DE102004041732A1 (es)
ES (1) ES2307203T3 (es)
MX (1) MX2007002365A (es)
MY (1) MY139599A (es)
PL (1) PL1781429T3 (es)
RU (1) RU2346773C2 (es)
TW (1) TWI332866B (es)
WO (1) WO2006024393A1 (es)

Cited By (1)

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WO2013135688A1 (de) 2012-03-15 2013-09-19 Sms Siemag Ag Vorrichtung zum richten von metallband

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ATE401144T1 (de) 2008-08-15
KR20070042932A (ko) 2007-04-24
US20080098784A1 (en) 2008-05-01
CA2578152C (en) 2012-06-05
DE102004041732A1 (de) 2006-03-02
JP2008511445A (ja) 2008-04-17
KR101141949B1 (ko) 2012-05-07
TW200609052A (en) 2006-03-16
AU2005279410B2 (en) 2010-04-15
DE502005004745D1 (de) 2008-08-28
EP1781429A1 (de) 2007-05-09
JP4781361B2 (ja) 2011-09-28
MX2007002365A (es) 2007-05-11
CA2578152A1 (en) 2006-03-09
MY139599A (en) 2009-10-30
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ES2307203T3 (es) 2008-11-16
BRPI0514803A (pt) 2008-06-24
RU2007102680A (ru) 2008-07-27
US7530250B2 (en) 2009-05-12
PL1781429T3 (pl) 2008-12-31
TWI332866B (en) 2010-11-11
RU2346773C2 (ru) 2009-02-20

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