EP0041025A1 - Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung - Google Patents
Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung Download PDFInfo
- Publication number
- EP0041025A1 EP0041025A1 EP81400827A EP81400827A EP0041025A1 EP 0041025 A1 EP0041025 A1 EP 0041025A1 EP 81400827 A EP81400827 A EP 81400827A EP 81400827 A EP81400827 A EP 81400827A EP 0041025 A1 EP0041025 A1 EP 0041025A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cage
- order
- rolling
- metal
- circuit
- 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
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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
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/12—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
-
- 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
- B21B2275/00—Mill drive parameters
- B21B2275/10—Motor power; motor current
- B21B2275/12—Roll torque
Definitions
- the present invention relates to the unconstrained rolling of metals and, more specifically, a method and a device for such rolling applicable to a continuous rolling train including at least two non-reversible cages whose respective drive motors are controlled by means of '' a circuit connected to a cruise control.
- Methods are known for detecting and correcting a possible tension or compression of the metal between two successive cages, methods according to which the value of the forward or backward sliding of the metal in each cage is regulated as an essential characteristic of any stress on the metal. .
- French patent 2,395,086 describes such a process.
- the speed sensors which must be used are generally either imprecise, such as the tachogenerators, or expensive, such as the electronic correlators, and are practically unusable for certain measurements, because of the ambient temperature conditions.
- this process does not take into account variations in the parasites of the rolling focus and in particular the volume flow rate of the rolled product. This results in a certain imprecision in the calculation of the slip value which is, therefore, maintained at a value such that each cage exerts a traction on the metal, it being understood that a very slight traction on the metal is entirely preferable to compression of the metal, or even at the sole risk of possible compression.
- the object of the present invention is to obviate all of the aforementioned drawbacks.
- FIG. 1 represents the block diagram of operation of two successive non-reversible stands of a continuous rolling train for long products, in accordance with the invention, and FIG. 2 represents more precisely the detail of one of the control units represented in FIG. 1.
- the non-reversible continuous rolling trains generally comprise several successive stands designated here symbolically by their date, for example (n), (n + 1) in which n is an integer at least equal to 1.
- Each cage is provided with a drive motor, respectively 4 and 5, coupled to a pulse generator 6, 7, the frequency of which is proportional to the speed of rotation of a motor to which it is coupled.
- an electric photo cell 8, 9 for example makes it possible to detect the immediate introduction of the metal into the cage, while a strain gauge 10, 11, placed in the cage, makes it possible to generate a signal representative of the rolling effort of the corresponding cage.
- the drive motors 4, 5 are supplied from the line 12 by means of converters 13, 14, in particular with thyristorso
- Each control unit for example 15 associated with the order cage (n) receives at its input terminal 20 the information relating to the control unit 16 associated with the immediately higher order cage (n + 1) , and, at its input terminals 21, 22, 23, 24 and 25, the signals respectively from the photoelectric cell 9 disposed at the input of the order cage (n + 1), of the gauge constraint 10 placed in the cage 2 of order (n), of the sensor 17 of the intensity of the current flowing in the converter 13 which it controls, of the pulse generators 6, 7 coupled to the order cages (n) and (n + 1).
- a general speed reference signal 18 of all the cages is applied to the input terminal 26 of all the control units so as to uniformly vary the rolling speed of the entire train under consideration.
- each control unit 15 has at least two output terminals 27 and 28, one connected to the downstream control unit and the other to the converter 13 which it controls.
- the control unit 15 of the order cage (n) is shown in more detail in FIG. 2 with the same references.
- This control unit 15 essentially comprises, in addition to the logic 30, a speed regulator 31 the output of which is connected to a current regulator 32 itself connected to the input terminal 23 of the unit, terminal which is connected to the sensor 17.
- the regulator 32 is connected to the output terminal 28 of the unit 15 9 itself connected to the converter 13.
- the signal from the pulse generator 6 is applied, by the input terminal 24 of the unit 15, to a converter 33 at the output of which is generated a digital signal representative of the frequency of the pulses.
- This output is connected, on the one hand, to the speed regulator 31, on the other hand, to a circuit for determining the rolling torque 34 which is also connected to the output of the speed regulator speed 31, and finally, to a divider circuit 35 which performs the ratio of the speeds of the order cages (n) and (n + 1), and to the other input from which the digital signal from a converter 36 is applied identical to the converter 33 but connected to the input terminal 25 of the unit 15 itself connected to the pulse generator 7 coupled to the motor 5 of the cage 3 of order (n + 1).
- One of the outputs of the circuit 34 for determining the rolling torque is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the rolling torque of the order cage (n) .
- This loop includes, in known manner, a first memory 37, a comparator 38 and a regulation circuit 39, operating during the first step of the method according to the invention, and a second memory 40 used during the second step of the method.
- This torque determination circuit 34 also has an output connected to an input of a circuit 41 for developing a multiplier coefficient, another input of which is connected to the input terminal 22 of the unit 15, which even connected to the strain gauge 10 arranged in the order cage (n).
- This processing circuit 41 is connected: to a multiplier circuit 42, to the other input from which the signal from the divider circuit 35 is applied.
- the output of the multiplier circuit 42 is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the flow of the rolled metal operating during the third step of the process.
- This last loop includes a memory 43, a comparator 44 and a regulator 45.
- the speed regulator 31 has an input terminal connected to the input terminal 26 of the unit 15 to which the general speed reference signal 18 is applied.
- the logic input terminals 30 are respectively connected to the input terminals 24, 22, 21 and 20 of the unit 15 and to an output terminal of the circuit 34 for determining the rolling torque, while its terminals outputs are connected on the one hand to the output terminal 26 of the unit 15 connected to the control unit of the order cage (n-1), and respectively to the control terminals of the memories 37 and 40 and of the circuit 39 of the torque control loop, as well as the memory control terminals 43 and regulator 45 of the flow control loop.
- the operation of the device is as follows: the taking over of the cage 2 of order (n) is detected by the appearance of a rolling torque in the motor 4, or by means of the strain gauge 10.
- the value of the rolling torque is determined by the circuit 34 and is recorded in the memory 37.
- the precise moment can be determined for example, either by means of a photoelectric cell 9 disposed at the input of the cage 3 as shown in FIG. 1, or by means of a counter connected to the output of the pulse generator 6 it being understood that the distance separating the two successive cages is well known.
- the value of the torque of rolling in the cage 2 of order (n) is kept constant by means of the regulation loop connected to the speed regulator 31 controlled in a known manner by the logic 30.
- the correction signal from comparator 38 is recorded in the memory 40, and remains permanently applied until the end of the rolling or speed regulator 31
- the logic 30 which has already controlled the succession of the aforementioned operations, then commands the commissioning of the flow regulation loop until the end of rolling carried out by the order cage (n). This flow regulation is obtained by applying a corrective term to the speed ratio.
- This corrective term is a multiplying coefficient which has the form of the expression 1 + k in which k is a function, among other things, of the force of separation of the cylinders of the cage considered, of the yield coefficient of this same cage, of the radius of the cylinders and also the thickness of the slot between the cylinders, in particular at the neutral point.
- This corrective term is developed by circuit 41 and is applied to the ratio of speeds of the cages of order (n) and (n + 1) by means of the multiplier circuit 42 o The signal from this latter circuit 42 is then processed in a loop identical to a speed control loop for cages.
- Such a process is favorably implemented for the rolling of long products such as rails, sections, trusses, it being understood that the product is found simultaneously during rolling, engaged in several successive non-reversible cages.
- the pulls or the compression of the product between two successive cages causes deformations in the desired profile of the finished product and the method according to the invention makes it possible to avoid such drawbacks.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8011796 | 1980-05-28 | ||
FR8011796A FR2483268A1 (fr) | 1980-05-28 | 1980-05-28 | Procede et dispositif pour le laminage sans ccontrainte de metaux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0041025A1 true EP0041025A1 (de) | 1981-12-02 |
EP0041025B1 EP0041025B1 (de) | 1985-01-09 |
Family
ID=9242404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81400827A Expired EP0041025B1 (de) | 1980-05-28 | 1981-05-25 | Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung |
Country Status (5)
Country | Link |
---|---|
US (1) | US4408470A (de) |
EP (1) | EP0041025B1 (de) |
JP (1) | JPS5736007A (de) |
DE (1) | DE3168119D1 (de) |
FR (1) | FR2483268A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0290834A1 (de) * | 1987-05-15 | 1988-11-17 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Zugsteuerung in einer Konti-Walzstrasse |
EP0698572A1 (de) * | 1994-08-27 | 1996-02-28 | Licentia Patent-Verwaltungs-GmbH | Verfahren zur Steuerung von Bahngeschwindigkeiten in einer Einrichtung für den Transport oder die Streckung einer Materialbahn |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR950009138B1 (ko) * | 1987-10-09 | 1995-08-16 | 가부시끼가이샤 히다찌 세이사꾸쇼 | 판재 열간 압연 설비의 제어장치 |
US5101650A (en) * | 1990-05-01 | 1992-04-07 | Allegheny Ludlum Corporation | Tandem mill feed forward gage control with speed ratio error compensation |
AU7935594A (en) * | 1993-10-18 | 1995-05-08 | Jack-Eric Vandenbroucke | Quick automated tool changer roll forming apparatus |
WO1997027012A1 (en) * | 1996-01-23 | 1997-07-31 | Siemens Aktiengesellschaft | System and method for rolling slabs |
US5806357A (en) * | 1996-01-23 | 1998-09-15 | Siemens Aktiengesellschaft | System and method for rolling tapered slabs |
FR2788233B1 (fr) * | 1999-01-11 | 2001-02-23 | Alstom | Procede de regulation des tractions/compressions dans un laminoir multicage a chaud et systeme de commande correspondant |
RU2198753C1 (ru) * | 2002-03-22 | 2003-02-20 | Общество с ограниченной ответственностью "СЛОТ" | Способ задания скоростного режима непрерывной группы прокатных клетей стана горячей прокатки металла с обеспечением минимального натяжения в межклетевых промежутках |
US10363590B2 (en) | 2015-03-19 | 2019-07-30 | Machine Concepts, Inc. | Shape correction leveler drive systems |
IT201700107113A1 (it) * | 2017-09-25 | 2019-03-25 | Danieli Off Mecc | Procedimento di regolazione del tiro di una barra e relativo dispositivo |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2413492A1 (de) * | 1974-03-20 | 1975-10-02 | Siemens Ag | Verfahren und schaltungsanordnung zur gegenseitigen abstimmung der antriebsdrehzahlen einer mehrgeruestigen walzstrasse mit einzelantrieben |
US3940960A (en) * | 1974-01-21 | 1976-03-02 | Hitachi, Ltd. | Interstand tension control method and apparatus for tandem rolling mills |
US4003230A (en) * | 1974-08-16 | 1977-01-18 | Hitachi, Ltd. | Tension control system for universal mill |
FR2323463A1 (fr) * | 1975-09-15 | 1977-04-08 | Siemens Ag | Procede et dispositif de laminage en continu |
FR2354154A1 (fr) * | 1976-06-11 | 1978-01-06 | Jeumont Schneider | Procede pour le laminage sans contrainte de metaux et dispositif pour la mise en oeuvre de ce procede |
US4087859A (en) * | 1975-08-20 | 1978-05-02 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for measuring and controlling interstand tensions of continuous rolling mills |
DE2816091A1 (de) * | 1977-04-28 | 1978-11-09 | Tokyo Shibaura Electric Co | Einrichtung zum steuern der zwischengeruestspannung eines kontinuierlichen walzwerks |
EP0008037A1 (de) * | 1978-08-03 | 1980-02-20 | Siemens Aktiengesellschaft | Vorrichtung zur Regelung der Zugkraft in einer mehrgerüstigen Walzstrasse |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3688532A (en) * | 1970-11-24 | 1972-09-05 | Antonio Vicente Silva | Control system for tandem rolling mill based on the constant volume principle |
JPS52116761A (en) * | 1976-03-26 | 1977-09-30 | Hitachi Ltd | System for controlling thickness of rolled plate |
JPS5561306A (en) * | 1978-11-01 | 1980-05-09 | Mitsubishi Electric Corp | Changing system for rolling schedule while running rolling stand |
JPS55112111A (en) * | 1979-02-23 | 1980-08-29 | Hitachi Ltd | Controller for continuous rolling mill |
-
1980
- 1980-05-28 FR FR8011796A patent/FR2483268A1/fr active Granted
-
1981
- 1981-05-12 JP JP7128381A patent/JPS5736007A/ja active Pending
- 1981-05-25 EP EP81400827A patent/EP0041025B1/de not_active Expired
- 1981-05-25 DE DE8181400827T patent/DE3168119D1/de not_active Expired
- 1981-05-26 US US06/266,916 patent/US4408470A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3940960A (en) * | 1974-01-21 | 1976-03-02 | Hitachi, Ltd. | Interstand tension control method and apparatus for tandem rolling mills |
DE2413492A1 (de) * | 1974-03-20 | 1975-10-02 | Siemens Ag | Verfahren und schaltungsanordnung zur gegenseitigen abstimmung der antriebsdrehzahlen einer mehrgeruestigen walzstrasse mit einzelantrieben |
US4003230A (en) * | 1974-08-16 | 1977-01-18 | Hitachi, Ltd. | Tension control system for universal mill |
US4087859A (en) * | 1975-08-20 | 1978-05-02 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for measuring and controlling interstand tensions of continuous rolling mills |
FR2323463A1 (fr) * | 1975-09-15 | 1977-04-08 | Siemens Ag | Procede et dispositif de laminage en continu |
FR2354154A1 (fr) * | 1976-06-11 | 1978-01-06 | Jeumont Schneider | Procede pour le laminage sans contrainte de metaux et dispositif pour la mise en oeuvre de ce procede |
DE2816091A1 (de) * | 1977-04-28 | 1978-11-09 | Tokyo Shibaura Electric Co | Einrichtung zum steuern der zwischengeruestspannung eines kontinuierlichen walzwerks |
EP0008037A1 (de) * | 1978-08-03 | 1980-02-20 | Siemens Aktiengesellschaft | Vorrichtung zur Regelung der Zugkraft in einer mehrgerüstigen Walzstrasse |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0290834A1 (de) * | 1987-05-15 | 1988-11-17 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Zugsteuerung in einer Konti-Walzstrasse |
US4942543A (en) * | 1987-05-15 | 1990-07-17 | Danieli & C. Officine Meccaniche Spa And Ceda Spa Costruzioni Elettromeccaniche E Dispositivi D'automazione | Method for regulating the pull in continuous rolling trains and rolling train which adopts said method |
EP0698572A1 (de) * | 1994-08-27 | 1996-02-28 | Licentia Patent-Verwaltungs-GmbH | Verfahren zur Steuerung von Bahngeschwindigkeiten in einer Einrichtung für den Transport oder die Streckung einer Materialbahn |
Also Published As
Publication number | Publication date |
---|---|
JPS5736007A (de) | 1982-02-26 |
US4408470A (en) | 1983-10-11 |
EP0041025B1 (de) | 1985-01-09 |
FR2483268B1 (de) | 1984-01-27 |
DE3168119D1 (en) | 1985-02-21 |
FR2483268A1 (fr) | 1981-12-04 |
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