EP1078700B1 - Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung - Google Patents
Verfahren zur Drehzahlsteuerung zwecks Minimierung der Innenpolygonbildung Download PDFInfo
- Publication number
- EP1078700B1 EP1078700B1 EP00250266A EP00250266A EP1078700B1 EP 1078700 B1 EP1078700 B1 EP 1078700B1 EP 00250266 A EP00250266 A EP 00250266A EP 00250266 A EP00250266 A EP 00250266A EP 1078700 B1 EP1078700 B1 EP 1078700B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall thickness
- controlling
- tube
- tube wall
- formation
- 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.)
- Expired - Lifetime
Links
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect 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
- 239000002243 precursor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 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 pipe wall thickness in one long - stand continuous stretch reduction rolling mill with facilities for Measurement of the pipe wall thickness behind the stretch reducing mill, a Computer unit for measured value processing and a device for speed control the drive motors (see, for example, JP-A-62 192 210).
- the deformation of the tube takes place during stretch reduction in a variety one behind the other arranged scaffolding, whereby by speed variation in the individual Scaffolds generated an interaction between the scaffolds and thus the Wall thickness of the finished pipe is set specifically.
- the transformation in the Stretch Reduction Rolling Line (SRW) is today usually in three-roll stands. So that the rolling stock does not enter the gap when reducing the pipe diameter enters between the rollers and as a result surface markings occur, the caliber of the rolls is not circular but - in the three-roll stand three-sided - oval. This three-sided form of the caliber is basically unavoidable. Only the last framework of a scaffold series used becomes 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 diameter reduction, the Wall thickness of the pipe, etc. are optimally adjusted. Will the ovality be too small? selected, one receives markings and damages of the outer surface. Will the Ovality chosen too large, it comes to pronounced wall thickness irregularities in the cross-section of the stretch-reduced tube. These wall thickness irregularities have a hexagonal shape (in the three-roll stand) and are called mecanicpolygon designated. Like all wall thickness deviations, so does the Interior polygon formation a loss of quality. Since the inner polygon formation u.a. of the Wall thickness or, better said, the ratio of wall thickness to pipe diameter is dependent, one needs to produce a large wall thickness range in the Usually different calibrations of the rolls, i.
- Object of the present invention is, using the speed control of Rolling A method of minimizing internal polygon formation during stretch reduction to create seamless pipes.
- the invention proposes that computer-controlled change in the rotational speeds of the drive motors during the Pipe run kept the total extension constant and thereby the Inner polygon formation is reduced to a minimum.
- the inventive method solves the problem of the above-described State of the art in that during the production process, a reduction the mecanical perfection by means of a control loop and variation of a Switzerlandparameters is performed.
- the train parameter defines a change in the Speed series and thus the train distribution in the rolling mill in such a way that the Total stretch in the rolling mill is unaffected. Because between the parameter of Train distribution and internal polygon formation there is a clear correlation Manages to reduce the internal polygon formation automatically, without the wall thickness of the front pipe to influence.
- a change of the train has different inner polygon formation Effects, depending on whether they are on the upstream or downstream side of the SRW takes place.
- a dependence of réellepolygonön of Train parameters This is the prerequisite for a control process for Reduced internal polygon formation.
- a possible control loop looks like this.
- the polygon measure at the SRW leaking pipe is detected during the pipe run by measurement (e.g. by means of US wall thickness measurement), the dependence of the polygonal dimension on variation of the tension parameter is determined and the parameter adjusted so that the Interior polygon formation is minimal.
- the constancy of the elongation is e.g. thereby 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 during the production operation an adaptive calculation method for this be used.
- Figure 1 describes the formation of an inner polygon and the calculation of the polygonal dimension P.
- the wall thickness of the tube in the region of the caliber base of the roller is denoted by s a , the wall thickness in the region of the center of the caliber side with s b .
- Due to the hexagonal symmetrical design of the inner pipe contour can be found pipe cross-sectional areas s a and s b almost the same deformation in each case at six points.
- the wall thickness values measured at these points are averaged as shown in Figure 1.
- the polygonal dimension P has a positive value when the location of the smaller wall thickness is in the caliber bottom, it has a negative value when the location of the smaller wall thickness is in the middle of the caliber flank.
- Figure 2 illustrates the dependence of the polygon measure on the train.
- the Polygon measure increases linearly as the tension increases. For small draft values it is negative, positive for large draft values.
- the draw value at which the polygon measure equals Zero is called optimal train.
- Figure 3 shows a possible variation of the train distribution, in which the total extension in the stretch reduction mill remains constant.
- train course ZP 1 in the inlet side region of the stretch-reducing mill train and thus the stretching of the rolling stock is higher than in the outlet side area.
- train distribution ZP 2 train and extension over the scaffolding places are approximately equally distributed.
- tension and extension are smaller in the inlet side stands than in the outlet side.
- Figure 4 shows the dependence of the polygonal dimension on the train parameter ZP.
- the polygon increases linearly as the tensile parameter increases.
- ZP 1 , ZP 2 and ZP 3 are concrete states of train variation, which is infinitely adjustable. From the dependence of the polygonal dimension on the tensile parameter determined during the rolling operation, the value of the tensile parameter for which the polygonal dimension is equal to zero is determined.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Laser Beam Printer (AREA)
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 EP1078700A2 (de) | 2001-02-28 |
| EP1078700A3 EP1078700A3 (de) | 2003-09-24 |
| EP1078700B1 true 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 (ja) |
| JP (1) | JP4113662B2 (ja) |
| AT (1) | ATE306993T1 (ja) |
| CZ (1) | CZ298954B6 (ja) |
| DE (2) | DE19941163A1 (ja) |
| ES (1) | ES2249229T3 (ja) |
| RU (1) | RU2247615C2 (ja) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0810055B1 (pt) | 2007-02-08 | 2016-10-18 | Nippon Steel & Sumitomo Metal Corp | rolo raiado para um redutor e redutor |
| RU2564194C2 (ru) * | 2013-07-04 | 2015-09-27 | Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") | Способ производства горячекатаных труб |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| 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 |
| EP1078700A2 (de) | 2001-02-28 |
| JP2001071012A (ja) | 2001-03-21 |
| JP4113662B2 (ja) | 2008-07-09 |
| RU2247615C2 (ru) | 2005-03-10 |
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