EP3840896B1 - Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation - Google Patents

Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation Download PDF

Info

Publication number
EP3840896B1
EP3840896B1 EP19755610.3A EP19755610A EP3840896B1 EP 3840896 B1 EP3840896 B1 EP 3840896B1 EP 19755610 A EP19755610 A EP 19755610A EP 3840896 B1 EP3840896 B1 EP 3840896B1
Authority
EP
European Patent Office
Prior art keywords
tube
wall thickness
stretch
measuring device
rolled
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
EP19755610.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3840896A1 (de
Inventor
Alexander Gohr
Peter Thieven
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 Group GmbH
Original Assignee
SMS Group GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=67660568&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3840896(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Priority to SI201930423T priority Critical patent/SI3840896T1/sl
Publication of EP3840896A1 publication Critical patent/EP3840896A1/de
Application granted granted Critical
Publication of EP3840896B1 publication Critical patent/EP3840896B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • 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
    • 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
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • 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
    • B21B37/46—Roll speed or drive motor control

Definitions

  • the present invention relates to a method for controlling a stretch-reducing mill according to the species of independent claim 1.
  • the present invention also relates to a control unit for a stretch-reducing mill according to the species of independent claim 7.
  • the present invention also relates to a stretch-reducing mill according to the species of independent claim 8.
  • a stretch-reducing mill which has a plurality of rolling stands arranged one behind the other in a conveying direction of a tube to be rolled.
  • the rolling speed of the roll stands increases in the conveying direction.
  • the rolled stock exiting the stretch-reducing mill can also have wall thickness fluctuations.
  • the causes of such fluctuations are, for example, inhomogeneous rolling conditions, such as changes in the rolling temperature, uneven tool wear of units upstream of the stretch-reducing mill, etc..
  • stretch-reducing mills can be equipped with control systems for controlling the wall thickness or reducing the fluctuations in the wall thickness during rolling of the tube be.
  • a known technical solution for compensating for wall thickness fluctuations consists in influencing the stretching of the tube to be rolled by a targeted change in the respective speeds of the roll stands. If, for example, a section of the tube entering the stretch-reducing mill is rolled with a wall thickness that is too great relative to a target value, a steeper speed curve, i.e. increasing speed differences between adjacent roll stands, can increase the instantaneous stretching and thus reduce the wall thickness more. On the other hand, if a section is rolled with a wall thickness that is too small relative to a target value, the instantaneous stretching in the stretch-reducing mill can be reduced by a flatter speed curve. In this way, wall thickness fluctuations of the tube entering the stretch-reducing mill are compensated for, so that the wall thickness of the tube leaving the stretch-reducing mill is made more uniform and the rolling quality is improved.
  • Controlling the speeds of the roll stands as a function of the wall thickness of the tube presupposes that a control unit for the stretch-reducing mill is supplied with information about the wall thickness of the tube to be rolled and/or the tube that has been rolled.
  • the DE 29 47 233 A1 proposes a rule based on measuring the wall thickness of the tube to be rolled before it enters the stretch-reducing mill, i.e. before it is formed by the roll stands of the stretch-reducing mill, using an isotope radiation measuring device, measuring the speed of the tube to be rolled before it enters the stretch-reducing mill the stretch reducer and a measurement of the speed of the rolled tube after exiting the stretch reducer.
  • Such a control suffers from the disadvantage that short-wave wall thickness fluctuations with extensions below the length of the rolling mill cannot be corrected.
  • the US 3,496,745A which forms the basis for the preambles of claims 1, 7 and 8, proposes dispensing with a control loop and measuring the mean wall thickness and the wall thickness profile of the to-be-rolled Tube, so only before the forming through the roll stands of the stretch-reducing mill to perform.
  • the current wall thickness of the tube to be rolled is measured by a wall thickness measuring device at different longitudinal positions or longitudinal coordinates of the tube, and the measured wall thicknesses are stored in association with the longitudinal positions as a wall thickness profile.
  • a control unit adjusts the respective speeds of the roll stands of the stretch-reducing mill according to a wall-thickness control algorithm on the basis of the wall-thickness curve previously determined by the wall-thickness measuring device in order to compensate for wall-thickness fluctuations of the tube to be rolled during the rolling of the tube in the stretch-reducing mill to compensate.
  • the US 3,496,745A also proposes that the control unit start the compensation of the wall thickness variations as a function of a signal from an optical sensor which is arranged inside the stretch-reducing mill or in front of the first roll stand of the stretch-reducing mill and is intended to detect the front end of the tube in the conveying direction.
  • the determination of the wall thickness progression takes place in the sense of US 3,496,745A not immediately before the tube to be rolled enters the roll stands of the stretch-reducing mill, but in terms of process technology far before the stretch-reducing mill, for example before the tube to be rolled is heated in a reheating furnace upstream of the stretch-reducing mill.
  • the pipe wall thickness does not change during transport.
  • the optical sensor intended for detecting the front end of the pipe is exposed to steam, dust and water spray, which can lead to inaccurate or erroneous detection results. If the front end of the tube is detected even slightly too late due to contamination of the optical sensor, the control unit starts the control for wall thickness compensation late. In this case, the speed changes of the roll stands caused by the control unit lag behind the actual position of the tube in the stretch-reducing mill, so that the wall thickness of the rolled tube can show any unpredictable fluctuations.
  • a further disadvantage of the prior art is the fact that the transport or conveying speed of the pipe into the stretch-reducing mill is not necessarily constant, but can change during rolling. It is therefore not possible to determine precisely which section of the tube is currently in the stretch-reducing mill from the mere sensor signal for the front end of the tube and a theoretical conveying speed.
  • the present invention is therefore based on the object of providing a method and a control unit for controlling a stretch-reducing mill and a stretch-reducing mill itself for rolling tubes, which ensure reliable compensation for wall thickness fluctuations of the tube to be rolled and wall thicknesses of the rolled tube within a narrow tolerance range.
  • the object of the present invention is achieved by a method presented below with the features of claim 1.
  • Advantageous embodiments of the method result from the features of dependent claims 2 to 6.
  • the object of the present invention is also achieved by a control unit having the features of claim 7.
  • the object of the present invention is achieved by a stretch-reducing mill having the features of claim 8.
  • Advantageous embodiments of the stretch-reducing mill result from the features of dependent claims 9 to 13.
  • the inventors propose that during the transport of the tube to be rolled to the Roll stands of the stretch-reducing mill, the instantaneous position of the tube to be rolled relative to the first roll stand of the stretch-reducing mill is continuously measured by a tube position measuring device arranged in front of the roll stands in the conveying direction of the tube.
  • the measured values of the tube position measuring device are continuously transmitted to the control unit for the stretch-reducing mill.
  • the control unit controls the respective speeds of the roll stands not only on the basis of the wall thickness profile of the tube to be rolled determined by a wall thickness measuring device, but also on the basis of the continuously transmitted measured values of the tube position measuring device in order to compensate for wall thickness fluctuations of the tube to be rolled in the stretch-reducing mill.
  • the tube position measuring device continuously measures a current longitudinal coordinate of the tube at a section of the tube that is currently not yet being rolled by the stretch-reducing mill.
  • the tube is moved relative to the tube position measuring device in the conveying direction to the stretch-reducing mill.
  • the conveying direction corresponds to the longitudinal direction of the tube or the direction of the longitudinal coordinates of the tube.
  • the pipe position measuring device is designed, during this relative movement of the pipe, to detect a position of the front end of the pipe in the conveying direction, also called pipe tip, and a position of the rear end of the pipe, also called pipe end, and to assign measured longitudinal coordinates corresponding to these positions.
  • the longitudinal coordinate of the pipe measured at a point in time represents the length of a section of the pipe to be rolled which has already passed through the longitudinal coordinate measurement carried out by the pipe position measuring device.
  • the pipe position measuring device thus carries out a length measurement which currently and with a high temporal resolution measures which longitudinal section or which pipe length has already passed the pipe position measuring device.
  • the pipe position measuring device continuously transmits the measured values determined by it to the control unit or makes the measured values available to an interface device designed for transmission to the control unit.
  • the pipe position measuring device can carry out the longitudinal coordinates of the pipe by means of continuous measuring methods known per se, such as an optical, electromagnetic and/or imaging measuring method of the pipe length. Whether the pipe position measuring device measures the longitudinal coordinates directly or indirectly by means of a mathematical transformation, for example single or multiple integration, of a primary measured variable is irrelevant for the present invention.
  • the control unit calculates the longitudinal position of the pipe that is currently entering the stretch-reducing mill, i.e. is currently in contact with the forming rollers of the first roll stand on the inlet side. For this calculation, the control unit uses the known distance between the tube position measuring device and the first roll stand of the stretch-reducing mill on the entry side. The control unit can also calculate the total length of the tube to be rolled from the measured longitudinal coordinates of the two ends of the tube to be rolled.
  • the control unit determines the instantaneous or current wall thickness of the tube at the longitudinal position of the tube that is currently entering the stretch-reducing mill. If this instantaneous wall thickness exceeds/falls below a predetermined target wall thickness, the control unit changes the speeds of the roll stands in accordance with a known rolling model in the sense of the steeper/flatter speed curves explained above.
  • the control unit uses the current longitudinal position of the tube determined as described above to calculate the current material distribution of the tube on the inlet side, inside the stretch-reducing mill and, if necessary, also on the outlet side of the stretch-reducing mill. In particular, the portion of the tube that is inside the stretch-reducing mill is determined.
  • the term continuous measurement of the longitudinal coordinates of the pipe means that during the relative movement between the pipe position measuring device and the pipe passing through it, a measurement is taken several times by the pipe position measuring device in order to measure how long the section of the pipe is at the moment , which has already passed the pipe position measuring device. These measurements can be continuous or discrete in time at defined points in time.
  • the term continuous measurement of the longitudinal coordinates of the tube does not mean that only the tip of the tube to be rolled is detected and the detection is reported to the control unit.
  • the control unit can precisely control the respective speeds of the roll stands in order to avoid wall-thickness fluctuations of the tube entering the stretch-reducing mill to compensate, so that the rolled tube has only very small wall thickness fluctuations within a narrow tolerance range.
  • a stretch-reducing mill for rolling tubes according to the invention is also presented, with which the same advantages as with the method presented can be realized.
  • the stretch-reducing mill assigns several to one in a conveying direction rolling tube on rolling stands arranged one behind the other.
  • the stretch-reducing mill is coupled or provided with a wall thickness measuring device arranged in front of the roll stands in the conveying direction for determining a wall thickness profile of the tube to be rolled and with a control unit for controlling the respective speeds of the roll stands during the rolling of the tube on the basis of the determined wall thickness profile in order to avoid wall thickness fluctuations of the pipe to compensate.
  • the stretch-reducing mill is coupled or provided with a tube position measuring device arranged upstream of the roll stands for continuously measuring a current longitudinal coordinate of the tube and for transmitting the measured values of the current longitudinal coordinate of the tube to the control unit.
  • the control unit is designed to control the rotational speeds of the roll stands during the rolling of the tube, also on the basis of the received measured values of the current longitudinal coordinates of the tube, in order to compensate for wall thickness fluctuations of the tube.
  • control unit for the stretch-reducing mill presented above is presented according to the invention.
  • the control unit is designed to control the respective speeds of the roll stands on the basis of a wall thickness profile of the tube to be rolled, determined by a wall thickness measuring device before rolling, in order to compensate for wall thickness fluctuations of the tube.
  • the control unit is also designed to receive measured values of a current longitudinal coordinate of the tube continuously measured by a tube position measuring device arranged in front of the roll stands in the conveying direction.
  • control unit is designed to control the rotational speeds of the roll stands during the rolling of the tube, also on the basis of the received measured values of the current longitudinal coordinates of the tube, in order to compensate for wall thickness fluctuations of the tube.
  • control unit controls rolling, specifically the respective speeds of the rolling stands, of a first section of the pipe on the basis of measured values of the longitudinal coordinates of the pipe, while the pipe position measuring device measures the current longitudinal coordinates of the pipe at a second Measures section of pipe continuously.
  • This further development of the method corresponds to a further development of the stretch-reducing mill presented, in which a conveying path of the tube to be rolled from the tube position measuring device to a first roll stand of the stretch-reducing mill in the conveying direction is shorter than the overall length of the tube to be rolled.
  • the conveying path is shorter than half the total length of the tube to be rolled.
  • the conveying path is shorter than a quarter of the total length of the tube to be rolled.
  • the control unit By simultaneously measuring the longitudinal coordinates of the pipe at a rear section of the pipe and controlling the speeds of the rolling stands on the basis of the measured values of the longitudinal coordinates already available during the rolling of a front section of the pipe, the control unit has particularly precise knowledge of the current position of the pipe and can therefore adapt the speeds of the roll stands particularly precisely to the current wall thickness, which is known to the control unit from the determined wall thickness profile, at the current position. A particularly high level of compensation for the wall thickness fluctuations of the incoming pipe is therefore achieved. The accuracy of the compensation of the wall thickness fluctuations of the tube to be rolled is higher, the shorter the conveying path or distance between the tube position measuring device and the first roll stand into which the tube to be rolled runs.
  • control unit controls rolling, specifically the respective speeds of the roll stands, of a first section of the pipe, while the wall thickness measuring device determines a wall thickness profile on a second section of the pipe.
  • This further development of the method presented corresponds to a further development of the stretch-reducing mill presented, in which a conveying path of the tube to be rolled from the wall thickness measuring device to a first roll stand of the stretch-reducing mill in the conveying direction is shorter than the overall length of the tube to be rolled.
  • the conveying path or distance from the wall thickness measuring device to the first roll stand is shorter than half the total length of the tube to be rolled. In a further development of this development, this conveying path is shorter than a quarter of the total length of the tube to be rolled.
  • the control unit Due to the simultaneous determination of the wall thickness profile of the tube on a rear section of the tube and the control of the speeds of the rolling stands on the basis of the already available measured values of the longitudinal coordinates and the partially determined wall thickness profile during the rolling of a front section of the tube, the control unit has particularly precise knowledge of the current position of the tube and can therefore adjust the speeds of the roll stands particularly precisely to the current wall thickness, which is known to the control unit from the partially determined wall thickness profile, at the current position. A particularly precise compensation of the wall thickness fluctuations of the incoming pipe is therefore achieved.
  • the accuracy of the compensation of the wall thickness fluctuations of the tube to be rolled is all the higher, the shorter the conveying path or distance between the wall thickness measuring device and the first roll stand into which the tube to be rolled runs.
  • the measured values of the longitudinal coordinates of the pipe measured by the pipe position measuring device are used to determine the course of the wall thickness and for transmission to the control unit.
  • the wall thicknesses measured by the wall thickness measuring device are thus linked to the values of the longitudinal coordinates of the pipe measured by the pipe position measuring device, which are also transmitted to the control unit.
  • the wall thickness of the tube to be rolled is preferably currently measured at the longitudinal position of the tube to be rolled, which is currently measured by the tube position measuring device as the current longitudinal coordinate.
  • the tube position measuring device and the wall thickness measuring device are designed for the simultaneous measurement of the same tube to be rolled.
  • the tube position measuring device and the wall thickness measuring device are designed as a single integrated device that measures the current longitudinal coordinates of the tube to be rolled and the wall thickness present at this position or longitudinal coordinate, combines these measured values into a wall thickness profile, and transmits the course of the wall thickness and the measured values of the longitudinal coordinates to the control unit.
  • the wall thickness measuring device and the tube position measuring device of the stretch-reducing mill presented are integrated in a single measuring device, which is arranged in such a way that a section of the tube to be rolled is measured with regard to the wall thickness and longitudinal coordinates, while a section of the tube that has already been measured is under control is rolled by the control unit on the basis of the measured wall thicknesses and longitudinal coordinates in order to compensate for wall thickness fluctuations of the tube to be rolled.
  • a particularly precise correlation between the measured wall thicknesses and the measured longitudinal coordinates is determined with these developments, which results in a particularly precise compensation of wall thickness fluctuations under the control of the control unit.
  • the tube position measuring device only measures the longitudinal coordinates of the tube, the measured value of which is to be transmitted to the control unit, when the wall thickness measuring device has determined the course of the wall thickness over the entire length of the tube to be rolled.
  • This development of the method corresponds to a development of the stretch-reducing mill presented, in which a length of a conveying path of the tube to be rolled between the wall thickness measuring device and the tube position measuring device or the first rolling stand is greater than the overall length of the tube to be rolled.
  • control unit also controls the speeds of the roll stands on the basis of signals from sensors arranged within the stretch-reducing mill and/or in the conveying direction of the tube behind the stretch-reducing mill in order to compensate for wall thickness fluctuations of the tube during rolling.
  • the additional sensors improve the accuracy of the method and its Reliability increased even further, especially when rolling short tubes.
  • the mother tube may have already left the tube position measuring device, while the front end of the tube has not yet left the stretch-reducing mill.
  • the actual feed of the tube is recorded by the additional sensors and can be taken into account by the control.
  • This further development of the method corresponds to a further development of the presented stretch-reducing mill, which is coupled or provided with sensors on or between the roll stands and/or in the conveying direction of the pipe behind the stretch-reducing mill.
  • the sensors are preferably designed as proximity sensors in order to detect the current position of the tube in the area of the roll stands and/or after it has left the last roll stand as precisely as possible.
  • the control unit is then designed to control the rotational speeds of the roll stands, also on the basis of the signals from the sensors, in order to compensate for wall thickness fluctuations of the tube during rolling.
  • phase A the process of tube measurement (see phase A) and tube rolling (see phase B) is shown schematically.
  • the tube 6 to be rolled is guided in its longitudinal direction through the wall thickness measuring device 2-2, which radiometrically measures a current wall thickness s of the tube during the tube movement 6 measures and transmits it to an evaluation unit 3 .
  • the current longitudinal coordinates Ix of the pipe 6 are measured in a pipe position measuring device 2-1 while the pipe 6 is passing through the wall thickness measuring device 2-2.
  • the current longitudinal coordinate Ix can be measured optically, for example, as in 1 illustrated.
  • the evaluation unit 3 assigns the measured current wall thicknesses s and the measured current longitudinal positions Ix of the tube 6 to be rolled, at which the wall thickness measurements are carried out, to one another and thus determines a wall thickness profile 4 of the tube 6 to be rolled. From the measured current longitudinal coordinates of the front and At the rear end of the tube, the evaluation unit 3 also determines the total tube length Iges of the tube 6 to be rolled.
  • the determined course of wall thickness 4 and the determined total pipe length Iges are transmitted from the evaluation unit to a control unit 1 for the stretch-reducing mill.
  • the re 1 The measurement of the current longitudinal coordinates Ix of the pipe 6 explained above serves exclusively to determine the course of the wall thickness 4, and the measured values of the current longitudinal coordinates Ix are not transmitted separately to the control unit 1.
  • the control unit 1 is designed to control the respective speeds of the roll stands 7 or their work rolls on the basis of the wall thickness profile 4 determined and transmitted by the evaluation unit 3. After the wall thickness profile 4 has been determined, the tube 6 to be rolled is placed in a reheating furnace (not shown) and then , in 1 shown as phase B for the same pipe 6, fed to the roll stands 7 of the stretch-reducing mill.
  • a proximity sensor 5 designed as a photocell is arranged at a distance a in front of the roll stands 7 of the stretch-reducing mill.
  • the proximity sensor 5 detects the arrival of the tip of the tube 6 to be rolled and reports the detection time t0 to the control unit 1, whereupon the control unit 1 continuously measures the time t from this time t0.
  • the distance a between the proximity sensor 5 and the first roll stand 7-1 is known to the control unit 1.
  • the approach speed v of the tube 6 to the first roll stand 7-1 is also known to the control unit 1.
  • the approach speed v can be a predetermined value or can be derived during operation, for example from the speeds of the roller table motors.
  • This calculation rule supplies position values for Ix within the limits of 0 ⁇ Ix ⁇ Iges.
  • the longitudinal coordinate Ix currently entering the first roll stand 7-1 is indirectly determined, namely by measuring the time t since the time t0 determined by the proximity sensor 5 and by using the Approach speed v of the pipe 6.
  • In 2 1 is illustrated an embodiment of a proposed stretch reducing mill consisting of a modification of that in FIG 1 illustrated structure.
  • the wall thickness profile 4 is determined in the in 2 illustrated embodiment as already with reference to 1 explained, so that a renewed explanation is omitted.
  • a tube position measuring device 8 is provided, which continuously and with a high temporal resolution measures the current longitudinal coordinates Ix of the tube 6 or the tube length l ⁇ 1 that has already passed through the tube position measuring device 8 .
  • the tube position measuring device 8 is arranged at a distance a in front of the first roll stand 7-1 of the stretch-reducing mill and continuously measures the current longitudinal coordinates Ix of the tube.
  • the measured values of the tube position measuring device 8 are continuously transmitted to the control unit 1A.
  • control unit 1A can determine the current wall thickness s of the pipe at this position very precisely from the determined wall thickness curve 4 and can therefore also control the speeds of the roll stands 7 very precisely on the basis of the determined current wall thickness.
  • the main difference between the 1 and 2 illustrated stretch-reducing mills with upstream measuring devices is that in the in 2 illustrated embodiment, the measured values of the current longitudinal position of the tube to be rolled are continuously transmitted to the control unit 1A, and the control unit 1A controls the speeds of the roll stands also on the basis of these measured values in order to compensate for wall thickness fluctuations of the tube to be rolled.
  • the embodiment according to 2 also offers a particularly high ability to compensate for wall thickness fluctuations of the tube to be rolled when the tube position measuring device 8 measures the actual longitudinal coordinates of a rear section of the tube, while the control device 1A simultaneously controls the speeds of the rolling stands 7 during the rolling of a front section of the tube .
  • the conveying path of the tube from the tube position measuring device 8 to the first roll stand 7-1 of the stretch-reducing mill is shorter than the total length Iges of the tube 6 to be rolled.
  • the exemplary embodiment illustrated is preferably used when a stretch-reducing mill with an already existing wall thickness measuring device, which measures the tube to be rolled long before it enters the roll stands, should be improved with regard to the precision of the compensation for wall thickness fluctuations.
  • FIG. 12 illustrates another embodiment of a proposed stretch reducer, in which, unlike the embodiment of FIG 2 a wall thickness measuring device 9 is arranged closely in front of the first rolling stand 7-1 of the stretch reducing mill.
  • the conveying path of the tube to be rolled from the wall thickness measuring device 9 to the first rolling stand 7-1 is shorter than the total length Iges of the tube 6 to be rolled.
  • the tube is preferably in the wall thickness measuring device 9 and the Roll stands 7 of the stretch-reducing mill.
  • the tube position measuring device 8 is preferably designed together with the wall thickness measuring device 9 as an integrated device 10 so that the tube position measuring device 8 and the wall thickness measuring device 10 measure the tube 6 simultaneously.
  • the measured values of the tube position measuring device 8 are duplicated and simultaneously fed to the evaluation unit 3 for determining the wall thickness profile 4 and to the control unit 1B for controlling the speeds of the roll stands. While the pipe position measuring device 8 continuously measures the longitudinal coordinate Ix and continuously transmits a corresponding data stream to the control unit 1B, the evaluation unit 3 continuously transmits a data stream to the control unit 1B, which represents the determined wall thickness profile 4 of the already measured pipe section.
  • the control unit 1B determines, taking into account the known distance a of the integrated device 10 of the tube position measuring device and the wall thickness measuring device to the first roll stand 7-1, from the measured length coordinates of the tube currently transmitted by the tube position measuring device, which tube position or pipe coordinate currently enters the first roll stand, and which pipe section has already entered the roll stands 7. At the same time, the control unit 1B determines the course of the wall thickness from the data stream 4 shows the current wall thickness at the tube position that is currently entering the first roll stand 7-1, and uses this data to calculate any necessary speed corrections so that the wall thickness fluctuations of the tube to be rolled are corrected during rolling.
  • the illustrated embodiment offers a particularly high level of precision with regard to the compensation of wall thickness fluctuations of the tube to be rolled, since the current wall thickness and the current longitudinal coordinates of the tube are measured at a small distance from the first roll stand, while at the same time a front section of the tube is being rolled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP19755610.3A 2018-08-20 2019-08-15 Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation Active EP3840896B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201930423T SI3840896T1 (sl) 2018-08-20 2019-08-15 Postopek in naprava za krmiljenje razteznega reducirnega valjarskega postrojenja za namen kompenzacije debeline stene

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018214002.2A DE102018214002A1 (de) 2018-08-20 2018-08-20 Verfahren und Vorrichtung zum Steuern eines Streckreduzierwalzwerks zwecks Wanddickenkompensation
PCT/EP2019/071975 WO2020038832A1 (de) 2018-08-20 2019-08-15 Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation

Publications (2)

Publication Number Publication Date
EP3840896A1 EP3840896A1 (de) 2021-06-30
EP3840896B1 true EP3840896B1 (de) 2022-10-12

Family

ID=67660568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19755610.3A Active EP3840896B1 (de) 2018-08-20 2019-08-15 Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation

Country Status (11)

Country Link
US (1) US11745235B2 (es)
EP (1) EP3840896B1 (es)
CN (1) CN112839745B (es)
DE (1) DE102018214002A1 (es)
ES (1) ES2935312T3 (es)
MA (1) MA53425A (es)
MX (1) MX2021001918A (es)
PL (1) PL3840896T3 (es)
RU (1) RU2758745C1 (es)
SI (1) SI3840896T1 (es)
WO (1) WO2020038832A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114001683B (zh) * 2021-10-26 2022-09-20 大连理工大学 一种基于坐标原点平移的复杂构件加工剩余壁厚自适应补偿方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496745A (en) 1967-05-01 1970-02-24 Kocks Gmbh Friedrich Process for stretch-reducing tubes
DE2947233A1 (de) 1979-11-23 1981-05-27 Kocks Technik GmbH & Co, 4000 Düsseldorf Verstelleinrichtung zum regeln des gesamtstreckgrades eines streckreduzierwalzwerkes
EP1611969B1 (en) * 2003-03-14 2009-07-01 Sumitomo Metal Industries, Ltd. Method and apparatus for producing pipe, wall thickness variation-obtaining device, and computer program

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401547A (en) * 1966-01-26 1968-09-17 Gen Dynamics Corp Measurement and control of rolled material thickness and quality
JPS5325259A (en) 1976-08-20 1978-03-08 Sumitomo Metal Ind Metal pipe outer diameter control device
SU812366A1 (ru) * 1979-02-21 1981-03-15 Предприятие П/Я В-8173 Устройство дл контрол разностен-НОСТи ТРубы
SU856602A1 (ru) * 1979-08-02 1981-08-23 Уральский научно-исследовательский институт трубной промышленности Устройство дл контрол средней толщины стенки трубы
DE3437449A1 (de) * 1984-10-12 1986-04-17 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH, 4000 Düsseldorf Vorrichtung zur erfassung von dickenschwankungen bei kaltgewalzten blechen
DE10229771A1 (de) * 2002-07-03 2004-01-29 Sms Meer Gmbh Verfahren und Vorrichtung zur Bestimmung der Exzentrizität eines Hohlblocks
DE10244554B4 (de) * 2002-09-25 2004-08-26 Sms Meer Gmbh Verfahren und Vorrichtung zur Messung der Wanddicke eines Rohres in einem Rohrwalzwerk
CN100409956C (zh) * 2004-03-30 2008-08-13 住友金属工业株式会社 管的定径轧制控制方法及定径轧制控制装置
CN102873100B (zh) * 2011-07-13 2014-12-17 中冶东方工程技术有限公司 三辊全浮芯棒连轧管机及其轧制工艺
DE102015118065A1 (de) * 2015-10-22 2017-04-27 Hans Joachim Pehle Verfahren zur Drehzahlanpassung von kontinuierlichen Rohrwalzwerken

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496745A (en) 1967-05-01 1970-02-24 Kocks Gmbh Friedrich Process for stretch-reducing tubes
DE2947233A1 (de) 1979-11-23 1981-05-27 Kocks Technik GmbH & Co, 4000 Düsseldorf Verstelleinrichtung zum regeln des gesamtstreckgrades eines streckreduzierwalzwerkes
EP1611969B1 (en) * 2003-03-14 2009-07-01 Sumitomo Metal Industries, Ltd. Method and apparatus for producing pipe, wall thickness variation-obtaining device, and computer program

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WILLEMS S, FRIEDRICH KOCKS : "'TUMICON --Mill Management and Control Tool of Advanced Stretch Reducing Blocks'", TUBE UKRAINE INTERNATIONAL CONFERENCE 2007, 1 January 2007 (2007-01-01), pages 107 - 114, XP093106968

Also Published As

Publication number Publication date
MX2021001918A (es) 2021-04-28
DE102018214002A1 (de) 2020-02-20
US11745235B2 (en) 2023-09-05
SI3840896T1 (sl) 2023-02-28
WO2020038832A1 (de) 2020-02-27
EP3840896A1 (de) 2021-06-30
CN112839745B (zh) 2023-07-14
CN112839745A (zh) 2021-05-25
MA53425A (fr) 2022-05-11
RU2758745C1 (ru) 2021-11-01
US20210323039A1 (en) 2021-10-21
ES2935312T3 (es) 2023-03-03
PL3840896T3 (pl) 2023-01-23

Similar Documents

Publication Publication Date Title
DE3413269C2 (es)
EP2259882B1 (de) Betriebsverfahren für eine mehrgerüstige walzstrasse mit banddickenermittlung anhand der kontinuitätsgleichung
DE69731008T2 (de) Walzverfahren für Bänder zur Reduzierung der Kantenschärfe
DE3036997A1 (de) Verfahren zur steuerung und regelung der temperatur eines werkstueckes waehrend des walzens in einem warmbandwalzwerk
EP2794136B1 (de) Verfahren und vorrichtung zum kühlen von walzen
EP3107666B1 (de) Einfache vorsteuerung einer keilanstellung eines vorgerüsts
EP3840896B1 (de) Verfahren und vorrichtung zum steuern eines streckreduzierwalzwerks zwecks wanddickenkompensation
EP0972581B1 (de) Walzverfahren für stabförmiges Walzgut, insbesondere Stabstahl oder Draht
DE102006008574A1 (de) Verfahren zur Unterdrückung des Einflusses von Walzenexzentrizitäten
EP2195126B1 (de) Walzvorrichtung und verfahren für deren betrieb
EP2662158A1 (de) Verfahren zur Bearbeitung von Walzgut und Walzwerk
EP2188074B1 (de) Betriebsverfahren für eine walzstrasse mit krümmungserkennung
DE3401894A1 (de) Verfahren zum herstellen von walzband mit hoher bandprofil- und bandplanheitsguete
EP1320425B1 (de) Verfahren und vorrichtung zum betreiben einer warmwalzstrasse mit mindestens einem stauchgerüst
DE3837101A1 (de) Verfahren zum steuern des bandlaufs beim walzen, in einer walzstrasse
EP3448592B1 (de) Verfahren zum walzen eines walzgutes
EP4100177B1 (de) Verfahren zur kalibrierung von vertikalrollen eines vertikalwalzgerüsts sowie walzstrasse mit einer kalibrieranordnung zur durchführung des verfahrens
DE4141086C2 (de) Verfahren zur Steuerung von Rohrkontiwalzwerken
DE1602168A1 (de) Verfahren und Einrichtung zum Regeln von Walzgut auf konstanten Querschnitt
DE102015121662A1 (de) Verfahren zur Durchführung einer Banddickenmessung sowie Banddickenmessgerät
DE3819571A1 (de) Verfahren zur regelung der wanddicke beim streckreduzieren von rohren
DE2951264A1 (de) Verfahren zur steuerung der hohlblockbewegungen beim pilgerwalzen zur optimierung der arbeitsrate und vorrichtung zur durchfuehrung des verfahrens
WO2008131929A1 (de) Verfahren zum betrieb einer formgebungsvorrichtung
DE102017112424A1 (de) Vorrichtung und Verfahren zur Bandlageregelung
EP1430963A1 (de) Verfahren zum Walzen eines Bandes

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210322

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20220412

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502019005915

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1523846

Country of ref document: AT

Kind code of ref document: T

Effective date: 20221115

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20221012

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2935312

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20230303

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230213

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230112

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230212

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230113

REG Reference to a national code

Ref country code: DE

Ref legal event code: R026

Ref document number: 502019005915

Country of ref document: DE

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLAX Notice of opposition and request to file observation + time limit sent

Free format text: ORIGINAL CODE: EPIDOSNOBS2

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

26 Opposition filed

Opponent name: KOCKS TECHNIK GMBH & CO

Effective date: 20230712

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230825

Year of fee payment: 5

VS25 Lapsed in a validation state [announced via postgrant information from nat. office to epo]

Ref country code: MD

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SI

Payment date: 20230803

Year of fee payment: 5

Ref country code: PL

Payment date: 20230803

Year of fee payment: 5

Ref country code: DE

Payment date: 20230821

Year of fee payment: 5

PLAF Information modified related to communication of a notice of opposition and request to file observations + time limit

Free format text: ORIGINAL CODE: EPIDOSCOBS2

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20231027

Year of fee payment: 5

PLBB Reply of patent proprietor to notice(s) of opposition received

Free format text: ORIGINAL CODE: EPIDOSNOBS3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230815

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20230815

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230815

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230831

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20230831

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A