EP1078700A2 - Procédé pour commander la vitesse de rotation pour minimiser la formation de polygones intérieurs - Google Patents

Procédé pour commander la vitesse de rotation pour minimiser la formation de polygones intérieurs Download PDF

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Publication number
EP1078700A2
EP1078700A2 EP00250266A EP00250266A EP1078700A2 EP 1078700 A2 EP1078700 A2 EP 1078700A2 EP 00250266 A EP00250266 A EP 00250266A EP 00250266 A EP00250266 A EP 00250266A EP 1078700 A2 EP1078700 A2 EP 1078700A2
Authority
EP
European Patent Office
Prior art keywords
wall thickness
stretch
controlling
polygon
tube
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
EP00250266A
Other languages
German (de)
English (en)
Other versions
EP1078700A3 (fr
EP1078700B1 (fr
Inventor
Hans Joachim Dr.Ing. Pehle
Peter Dr.Ing. 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 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
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1078700A2 publication Critical patent/EP1078700A2/fr
Publication of EP1078700A3 publication Critical patent/EP1078700A3/fr
Application granted granted Critical
Publication of EP1078700B1 publication Critical patent/EP1078700B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21B37/78—Control of tube rolling
    • 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

Definitions

  • the invention relates to a method for controlling the tube wall thickness in one multi-stand continuous stretch reduction rolling mill with facilities for Measurement of the tube wall thickness behind the stretch reduction mill, one Computer unit for processing measured values and a device for speed control of the drive motors
  • the tube is formed in a variety of ways when the stretch is reduced Scaffolds arranged one behind the other, with variation in speed in the individual Scaffolding creates an interaction between the scaffolding and thus the Wall thickness of the finished pipe is set specifically.
  • the transformation in the The stretch-reducing mill (SRW) is usually carried out today in three-roll stands. So that the rolling stock does not enter the gap when the pipe diameter is reduced between the rollers and surface marks appear as a result the caliber of the rolls is not circular, but - on three sides in the three-roll stand - oval. This three-sided form of the caliber is fundamentally unavoidable. Only the last scaffold of a row of scaffolds used is generally circular executed. This is possible because the diameter change in this framework is small. It is necessary because the finished rolled pipe should be largely circular.
  • the "ovality" of the caliber must depend on the reduction in diameter, the Wall thickness of the pipe etc. can be optimally adjusted. If the ovality becomes too small selected, you get markings and damage to the outer surface. Will the If the ovality is too large, the wall thickness will be uneven in the cross section of the reduced-stretch pipe. This wall thickness unevenness have a hexagonal shape (in the three-roll stand) and are used as an inner polygon designated. Like all wall thickness deviations, that means Internal polygon formation a loss of quality. Since the inner polygon formation i.a. of the Wall thickness or rather the ratio of wall thickness to pipe diameter dependent, you need to generate a large wall thickness range in the Usually different calibrations of the rolls, i.e. different ovalities of the Roll calibration.
  • the object of the present invention is to use the speed control Rolling is a process to minimize internal polygon formation when stretching is reduced to create seamless pipes.
  • the invention proposes that Computer controlled change in the speed of the drive motors during the Pipe run kept the total stretch constant and thereby the Inner polygon formation is reduced to a minimum.
  • the inventive method solves the problem of State of the art in that a reduction during the production process the inner polygon formation by means of a control loop and variation of a Train parameters is carried out.
  • the train parameter defines a change in Speed series and thus the train distribution in the rolling mill in such a way that the Total stretching in the rolling mill remains unaffected. Since between the parameter of Train distribution and the inner polygon formation there is a clear connection, the inner polygon formation can be automatically reduced without reducing the wall thickness to influence the down tube.
  • a change in the train has different in terms of the inner polygon formation Effects, depending on whether they are in the inlet or outlet area of the SRW takes place. This results in a dependence of the inner polygon formation on Train parameters. This is the prerequisite for a control process Reduction of the inner polygon formation given.
  • a possible control loop looks like this.
  • the polygon dimension on the from the SRW leaking pipe is measured during the pipe run (e.g. by means of US wall thickness measurement), the dependence of the polygon dimension on variation the train parameter is determined and the parameter is set so that the Inner polygon formation is minimal.
  • the constancy of the stretch is e.g. by ensuring that the Speed variation already in the process planning for each dimension of the Rolling program is defined so that the average train in the SRW remains the same. Also can use an adaptive calculation method for this during production be used.
  • Figure 1 describes the formation of an inner polygon and the calculation of the polygon dimension P.
  • the wall thickness of the tube in the area of the caliber base of the roller is identified here with s a , the wall thickness in the area of the center of the caliber flank with s b . Due to the hexagonal, symmetrical design of the inner tube contour, tube cross-sectional areas s a and s b of almost the same deformation are found in six places. The wall thickness values measured at these points are averaged as shown in Figure 1.
  • the polygon dimension P has a positive value if the location of the smaller wall thickness lies in the caliber base, it has a negative value if the location of the smaller wall thickness lies in the middle of the caliber flank.
  • Figure 2 illustrates the dependence of the polygon dimension on the train.
  • the Polygon dimension increases linearly with increasing traction. With small train values it is negative, with large tensile values positive.
  • the tensile value at which the polygon dimension is equal Zero is known as an 'optimal move'.
  • Figure 3 shows a possible variation of the tension distribution in which the total stretch in the stretch-reducing mill is constant.
  • the train and thus the elongation of the rolling stock becomes higher in the area of the stretch-reducing mill on the inlet side than in the area on the exit side.
  • the ZP 2 train distribution system train and extension are roughly evenly distributed over the scaffolding sites. With ZP 3 , tension and extension are smaller in the entry-side scaffolds than in the exit-side frames.
  • Figure 4 shows the dependence of the polygon dimension on the tensile parameter ZP.
  • the polygon dimension increases linearly as the tensile parameter increases.
  • ZP 1 , ZP 2 and ZP 3 are concrete states of the train variation, which is continuously adjustable.
  • the value of the tension parameter for which the polygon dimension is zero is determined from the dependence of the polygon dimension on the tensile parameter determined during the rolling operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Laser Beam Printer (AREA)
EP00250266A 1999-08-24 2000-08-09 Procédé pour commander la vitesse de rotation pour minimiser la formation de polygones intérieurs Expired - Lifetime EP1078700B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19941163A DE19941163A1 (de) 1999-08-24 1999-08-24 Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung
DE19941163 1999-08-24

Publications (3)

Publication Number Publication Date
EP1078700A2 true EP1078700A2 (fr) 2001-02-28
EP1078700A3 EP1078700A3 (fr) 2003-09-24
EP1078700B1 EP1078700B1 (fr) 2005-10-19

Family

ID=7920125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00250266A Expired - Lifetime EP1078700B1 (fr) 1999-08-24 2000-08-09 Procédé pour commander la vitesse de rotation pour minimiser la formation de polygones intérieurs

Country Status (7)

Country Link
EP (1) EP1078700B1 (fr)
JP (1) JP4113662B2 (fr)
AT (1) ATE306993T1 (fr)
CZ (1) CZ298954B6 (fr)
DE (2) DE19941163A1 (fr)
ES (1) ES2249229T3 (fr)
RU (1) RU2247615C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127768A4 (fr) * 2007-02-08 2013-04-17 Nippon Steel & Sumitomo Metal Corp Cylindre de guidage de réducteur et réducteur
RU2564194C2 (ru) * 2013-07-04 2015-09-27 Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") Способ производства горячекатаных труб

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2332271C1 (ru) * 2006-11-20 2008-08-27 ОАО "Синарский трубный завод" Способ производства бесшовных горячекатаных труб

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58167003A (ja) * 1982-03-27 1983-10-03 Sumitomo Metal Ind Ltd 絞り圧延機の偏肉防止装置
JPS61216811A (ja) * 1985-03-22 1986-09-26 Nippon Kokan Kk <Nkk> 金属管の多スタンド連続延伸圧延方法
JPS62192210A (ja) * 1986-02-17 1987-08-22 Kawasaki Steel Corp 絞り圧延機における管の肉厚制御方法
DE3819571A1 (de) * 1988-06-06 1989-12-07 Mannesmann Ag Verfahren zur regelung der wanddicke beim streckreduzieren von rohren
RU2041759C1 (ru) * 1989-01-03 1995-08-20 Юрий Михайлович Водопьянов Устройство для продольной прокатки деталей
RU2056959C1 (ru) * 1993-10-06 1996-03-27 Товарищество с ограниченной ответственностью фирма "ВИГО ЛТД" Устройство для определения средней толщины стенки трубы

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127768A4 (fr) * 2007-02-08 2013-04-17 Nippon Steel & Sumitomo Metal Corp Cylindre de guidage de réducteur et réducteur
RU2564194C2 (ru) * 2013-07-04 2015-09-27 Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") Способ производства горячекатаных труб

Also Published As

Publication number Publication date
EP1078700A3 (fr) 2003-09-24
ATE306993T1 (de) 2005-11-15
JP2001071012A (ja) 2001-03-21
CZ298954B6 (cs) 2008-03-19
EP1078700B1 (fr) 2005-10-19
JP4113662B2 (ja) 2008-07-09
RU2247615C2 (ru) 2005-03-10
DE50011358D1 (de) 2005-11-24
DE19941163A1 (de) 2001-03-01
CZ20003105A3 (cs) 2001-07-11
ES2249229T3 (es) 2006-04-01

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