EP1078700A2 - Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung - Google Patents
Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung Download PDFInfo
- 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
- controlling
- tube
- stretch
- polygon
- 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
Links
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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)
Abstract
Description
- ein kleineres Verhältnis von Rohrwanddicke zu Rohrdurchmesser
- ein größeres Verhältnis von Rohrdurchmesser zu Walzendurchmesser
- eine höhere Temperatur
- eine größere Kaliberovalität
Claims (5)
- Verfahren zur Steuerung der Rohrwanddicke in einer vielgerüstigen kontinuierlichen Streckreduzierwalzstraße mit Einrichtungen zur Messung der Rohrwanddicke hinter der Streckreduzierwalzstraße, einer Rechnereinheit zur Meßwertverarbeitung und einer Einrichtung zur Drehzahlsteuerung der Antriebsmotoren,
dadurch gekennzeichnet,
daß durch rechnergesteuerte Veränderung der Drehzahlen der Antriebsmotoren während des Rohrdurchlaufes die Gesamtstreckung konstant gehalten und dadurch die Innenpolygonbildung auf ein Minimum reduziert wird. - Verfahren zur Steuerung der Rohrwanddicke nach Anspruch 1,
dadurch gekennzeichnet,
daß durch Veränderung der Drehzahlen der Antriebsmotoren die Drehzahlverhältnisse in einer Walzgerüstgruppe erhöht werden und zugleich in einer anderen Walzgerüstgruppe vermindert werden, so daß die Streckung des Rohres insgesamt konstant bleibt. - Verfahren zur Steuerung der Rohrwanddicke nach Anspruch 1 und 2,
dadurch gekennzeichnet,
daß das Polygonmaß an dem aus dem SRW auslaufenden Rohr (z.B. mittels US-Wanddickenmessung) während des Rohrdurchlaufes meßtechnisch erfaßt wird, die Abhängigkeit des Polygonmaßes bei Variation des Zugparameters ermittelt wird und der Parameter so eingestellt wird, daß die Innenpolygonbildung minimal ist. - Verfahren zur Steuerung der Rohrwanddicke nach Anspruch 1 bis 3,
dadurch gekennzeichnet,
daß zur Sicherstellung der Konstanz der Streckung bei der Prozeßplanung die Drehzahlvariation für jede Abmessung des Walzprogrammes so definiert wird, daß der mittlere Zug im SRW gleich bleibt. - Verfahren zur Steuerung der Rohrwanddicke nach Anspruch 1 bis 4,
dadurch gekennzeichnet,
daß während des Produktionsbetriebes ein adaptives Berechnungsverfahren für die Drehzahlvariation eingesetzt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19941163 | 1999-08-24 | ||
DE19941163A DE19941163A1 (de) | 1999-08-24 | 1999-08-24 | Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1078700A2 true EP1078700A2 (de) | 2001-02-28 |
EP1078700A3 EP1078700A3 (de) | 2003-09-24 |
EP1078700B1 EP1078700B1 (de) | 2005-10-19 |
Family
ID=7920125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00250266A Expired - Lifetime EP1078700B1 (de) | 1999-08-24 | 2000-08-09 | Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1078700B1 (de) |
JP (1) | JP4113662B2 (de) |
AT (1) | ATE306993T1 (de) |
CZ (1) | CZ298954B6 (de) |
DE (2) | DE19941163A1 (de) |
ES (1) | ES2249229T3 (de) |
RU (1) | RU2247615C2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2127768A1 (de) * | 2007-02-08 | 2009-12-02 | Sumitomo Metal Industries Limited | Profilwalze für reduzierstück und reduzierstück |
RU2564194C2 (ru) * | 2013-07-04 | 2015-09-27 | Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") | Способ производства горячекатаных труб |
Citations (3)
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 |
-
1999
- 1999-08-24 DE DE19941163A patent/DE19941163A1/de not_active Withdrawn
-
2000
- 2000-08-09 EP EP00250266A patent/EP1078700B1/de not_active Expired - Lifetime
- 2000-08-09 ES ES00250266T patent/ES2249229T3/es not_active Expired - Lifetime
- 2000-08-09 DE DE50011358T patent/DE50011358D1/de not_active Expired - Lifetime
- 2000-08-09 AT AT00250266T patent/ATE306993T1/de active
- 2000-08-23 RU RU2000122303/02A patent/RU2247615C2/ru active
- 2000-08-24 JP JP2000253587A patent/JP4113662B2/ja not_active Expired - Lifetime
- 2000-08-24 CZ CZ20003105A patent/CZ298954B6/cs not_active IP Right Cessation
Patent Citations (3)
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 |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 002 (M-266), 7. Januar 1984 (1984-01-07) -& JP 58 167003 A (SUMITOMO METAL IND LTD), 3. Oktober 1983 (1983-10-03) * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 054 (M-563), 19. Februar 1987 (1987-02-19) -& JP 61 216811 A (NIPPON KOKAN KK), 26. September 1986 (1986-09-26) * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 039 (M-665), 5. Februar 1988 (1988-02-05) -& JP 62 192210 A (KAWASAKI STEEL CORP), 22. August 1987 (1987-08-22) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2127768A1 (de) * | 2007-02-08 | 2009-12-02 | Sumitomo Metal Industries Limited | Profilwalze für reduzierstück und reduzierstück |
EP2127768A4 (de) * | 2007-02-08 | 2013-04-17 | Nippon Steel & Sumitomo Metal Corp | Profilwalze für reduzierstück und reduzierstück |
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 |
---|---|
EP1078700B1 (de) | 2005-10-19 |
CZ298954B6 (cs) | 2008-03-19 |
DE50011358D1 (de) | 2005-11-24 |
CZ20003105A3 (cs) | 2001-07-11 |
DE19941163A1 (de) | 2001-03-01 |
ATE306993T1 (de) | 2005-11-15 |
EP1078700A3 (de) | 2003-09-24 |
ES2249229T3 (es) | 2006-04-01 |
JP2001071012A (ja) | 2001-03-21 |
JP4113662B2 (ja) | 2008-07-09 |
RU2247615C2 (ru) | 2005-03-10 |
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