EP0539784B1 - Assembly for the controlled prerolling of thin slabs leaving a continuous casting plant - Google Patents

Assembly for the controlled prerolling of thin slabs leaving a continuous casting plant Download PDF

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Publication number
EP0539784B1
EP0539784B1 EP92117271A EP92117271A EP0539784B1 EP 0539784 B1 EP0539784 B1 EP 0539784B1 EP 92117271 A EP92117271 A EP 92117271A EP 92117271 A EP92117271 A EP 92117271A EP 0539784 B1 EP0539784 B1 EP 0539784B1
Authority
EP
European Patent Office
Prior art keywords
rolls
rolling
assembly
continuous casting
sector parts
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
Application number
EP92117271A
Other languages
German (de)
French (fr)
Other versions
EP0539784B2 (en
EP0539784A1 (en
Inventor
Bruno Di Giusto
Fulvio Fasano
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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Filing date
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Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP0539784A1 publication Critical patent/EP0539784A1/en
Application granted granted Critical
Publication of EP0539784B1 publication Critical patent/EP0539784B1/en
Publication of EP0539784B2 publication Critical patent/EP0539784B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/14—Soft reduction

Definitions

  • This invention concerns an assembly for the controlled pre-rolling of thin slabs leaving a continuous casting plant, as set forth in the main claim.
  • the invention concerns an assembly located immediately downstream of the foot rolls of an ingot mould for the continuous casting of thin slabs.
  • This assembly performs a controlled pre-rolling operation on thin slabs leaving the mould.
  • thin slabs are meant here slabs with a width ranging from 1200 to 2500 mm. or more and a thickness between 25 and 70 mm.
  • pre-rolling assemblies comprise mechanical regulation systems with pre-regulation at the beginning of a casting cycle.
  • These assemblies are associated with continuous pre-rolling rolls, or rolls consisting of segments, or assemblies of rolls, or else assemblies of endless pressure belts positioned on rolls.
  • JP-A-62130759 teaches the provision of a straightening assembly placed in a position distant from the continuous casting mould so as to process a slab or billet which no longer contains a liquid core.
  • the straightening action on a slab which does not have a liquid core is different from the pre-rolling action and requires great forces and strong complex structures to carry out an effective, useful action.
  • the prior document JP-A-1-271.047 includes reducing the thickness of the slab independently of whether there is a liquid core or not, and independently of the closing position of the liquid core.
  • the pre-rolling rolls are positioned downstream of the mould and immediately downstream of the foot rolls.
  • pre-rolling rolls work and act on thin slabs which still contain a liquid core, and exploit the plastic condition arising from the temperature of the peripheral skin and the inclusion of the liquid core.
  • the pre-rolling rolls positioned on the outer curved side, or extrados side are associated with load cells which control the pressure that the thin slab exerts on the rolls.
  • the pre-rolling rolls positioned on the inner curved side, or intrados side, are associated with hydraulic capsules, for instance of the type disclosed in EP-0444420.
  • a transducer indicating pressure and position is included with the hydraulic capsule.
  • the inner curved side and outer curved side may each include a stationary part and movable part which cooperate respectively with a movable part and stationary part of the other side.
  • the whole assembly is governed by a control and data processing unit, which receives signals from the load cells and transducers and compares them with the rolling parameters, whether the latter be identified parameter by parameter or all the parameters, and thereby obtains information for the control and possible necessary regulation.
  • rolls are meant continuous rolls, or rolls consisting of individual segments, or endless belts supported on rolls, etc., thus covering any known system.
  • the regulation achieved is individual for each assembly of rolls or is general for the whole pre-rolling assembly.
  • the regulations may be added up algebraically.
  • a pre-rolling assembly 10 of which only a segment is shown in Fig.1, is positioned immediately downstream of foot rolls 12 associated with a mould 11 which produces a thin slab 20 continuously.
  • the rolls shown may be continuous rolls or may consist of segments of rolls 14-16 or be grouped in twos or more 114-116 or may support an endless belt 214-216 or be of yet another known type.
  • the rolls 14-114-214 and the other known rolls of the variants of the outer curved sector 13 are associated individually or in groups with at least one load cell 15, which transmits signals to a control and data processing unit 21.
  • the rolls 16-116-216 and the other known rolls of the variants of the inner curved sector 22 are associated individually or in groups with at least one hydraulic capsule 17.
  • the hydraulic capsule 17 is governed by a servovalve 19 and is associated with a transducer 18 which indicates the position and pressure.
  • the servovalves 19 are governed by the control and data processing unit 21.
  • Each pressure and position transducer 18 transmits its signal to the control and data processing unit 21 and may receive control and verification signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Paper (AREA)
  • Continuous Casting (AREA)
  • Crushing And Grinding (AREA)

Abstract

Assembly for the controlled pre-rolling of thin slabs (20) leaving a continuous casting mould (11) including foot rolls (12), the assembly comprising a stationary sector (13) and a movable sector (22), each of these sectors (13-22) being able to be all the same or mixed and including respective rolls (14-114-214,16-116-216), the assembly being positioned downstream of the foot rolls, the rolls (14-114-214) of the stationary sector (13) being associated at least one by one with a load cell (15), while the rolls (16-116-216) of the movable sector (22) are associated at least one by one with a hydraulic capsule (17) governed by a servovalve (19). <IMAGE>

Description

This invention concerns an assembly for the controlled pre-rolling of thin slabs leaving a continuous casting plant, as set forth in the main claim.
To be more exact, the invention concerns an assembly located immediately downstream of the foot rolls of an ingot mould for the continuous casting of thin slabs. This assembly performs a controlled pre-rolling operation on thin slabs leaving the mould.
By thin slabs are meant here slabs with a width ranging from 1200 to 2500 mm. or more and a thickness between 25 and 70 mm.
This invention can also be applied to the continuous casting of billets, whether they be round, square, rectangular, etc.; it can also be applied to continuous casting plants which are straight or curved.
Nowadays pre-rolling assemblies comprise mechanical regulation systems with pre-regulation at the beginning of a casting cycle.
These assemblies are associated with continuous pre-rolling rolls, or rolls consisting of segments, or assemblies of rolls, or else assemblies of endless pressure belts positioned on rolls.
These known systems do not make possible an optimum regulation, nor a pre-rolling of a desired value, nor a continuously controlled path which is continuously related to the actual pre-rolling requirements.
JP-A-62130759 teaches the provision of a straightening assembly placed in a position distant from the continuous casting mould so as to process a slab or billet which no longer contains a liquid core.
The straightening action on a slab which does not have a liquid core is different from the pre-rolling action and requires great forces and strong complex structures to carry out an effective, useful action.
The prior document JP-A-1-271.047 includes reducing the thickness of the slab independently of whether there is a liquid core or not, and independently of the closing position of the liquid core.
Moreover, this document does not teach to include a fine control of the pre-rolling process, nor does it teach to begin the pre-rolling immediately after the foot rolls.
The present applicants have designed, tested and embodied this invention to obviate the shortcomings of the state of the art and to achieve further advantages.
The invention is set forth and characterized in the main claim, while the dependent claims describe variants of the idea of the embodiment.
According to the invention, where the continuous casting plants are curved, the pre-rolling rolls are positioned downstream of the mould and immediately downstream of the foot rolls.
These pre-rolling rolls work and act on thin slabs which still contain a liquid core, and exploit the plastic condition arising from the temperature of the peripheral skin and the inclusion of the liquid core.
According to the invention, the pre-rolling rolls positioned on the outer curved side, or extrados side, are associated with load cells which control the pressure that the thin slab exerts on the rolls.
The pre-rolling rolls positioned on the inner curved side, or intrados side, are associated with hydraulic capsules, for instance of the type disclosed in EP-0444420.
The reason for this is that the displacement should be of a modest value and be perfectly controlled and capable of being controlled.
A transducer indicating pressure and position is included with the hydraulic capsule.
This description takes the outer curved side, or extrados side, as being the stationary part and the inner curved side, or intrados side, as being the movable part for the sake of an example, but in actual practice the two parts can be exchanged for each other.
According to a variant the inner curved side and outer curved side may each include a stationary part and movable part which cooperate respectively with a movable part and stationary part of the other side.
The whole assembly is governed by a control and data processing unit, which receives signals from the load cells and transducers and compares them with the rolling parameters, whether the latter be identified parameter by parameter or all the parameters, and thereby obtains information for the control and possible necessary regulation.
In this description by "rolls" are meant continuous rolls, or rolls consisting of individual segments, or endless belts supported on rolls, etc., thus covering any known system.
The regulation achieved is individual for each assembly of rolls or is general for the whole pre-rolling assembly.
The regulations may be added up algebraically.
Let us now see a preferred embodiment of the invention with the help of the attached figures, which are given as a non-restrictive example as follows:-
Fig.1
is a diagrammatic side view of a pre-rolling assembly for thin slabs produced by a curved continuous casting plant;
Figs.2 and 3
show two other possible types of pre-rolling rolls.
In the figures a pre-rolling assembly 10, of which only a segment is shown in Fig.1, is positioned immediately downstream of foot rolls 12 associated with a mould 11 which produces a thin slab 20 continuously.
In the zone where the pre-rolling assembly 10 operates, the thin slab 20 still contains a liquid core.
The rolls shown may be continuous rolls or may consist of segments of rolls 14-16 or be grouped in twos or more 114-116 or may support an endless belt 214-216 or be of yet another known type.
In the example shown the outer curved side, or extrados side, 13 is the stationary sector, while the inner curved side, or intrados side,22 is the movable sector.
The rolls 14-114-214 and the other known rolls of the variants of the outer curved sector 13 are associated individually or in groups with at least one load cell 15, which transmits signals to a control and data processing unit 21.
The rolls 16-116-216 and the other known rolls of the variants of the inner curved sector 22 are associated individually or in groups with at least one hydraulic capsule 17.
The hydraulic capsule 17 is governed by a servovalve 19 and is associated with a transducer 18 which indicates the position and pressure.
The hydraulic capsule 17 enables even the smallest movement to be carried out in a controlled and controllable manner while providing a considerable force at the same time.
The servovalves 19 are governed by the control and data processing unit 21.
Each pressure and position transducer 18 transmits its signal to the control and data processing unit 21 and may receive control and verification signals.
At the beginning of a rolling cycle the parameters linked to the pre-rolling to be carried out are set or inserted on the control and data processing unit 21 and may be associated with the type of material cast and with the dimensions of the thin slab 20 and the characteristics of the liquid core.
The control and data processing unit 21 pre-arranges the rolls 14-114-214 and 16-116-216 and, when casting begins and the starter bar has gone past, controls and regulates the rolls 14-114-214 and 16-116-216 so that the desired pre-rolling takes place.

Claims (3)

  1. Pre-rolling assembly for the controlled pre-rolling of thin slabs (20) leaving a continuous casting mould (11) including foot rolls (12), the assembly comprising facing rolling sectors having stationary sector parts (13) and therewith cooperating movable sector parts (22), the rolling sectors being operatingly disposed along the two wide faces of the thin slab, and including respective pre-rolling rolls (14,114,214 - 16,116,216), the assembly being characterized in that it is positioned downstream of the foot rolls (12), and that the rolls (14,114,214) of the stationary sector parts (13) are associated at least one by one with a load cell (15) while the rolls (16,116,216) of the movable sector parts (22) are associated at least one by one with a hydraulic capsule (17) governed by a servovalve (19), each hydraulic capsule (17) being associated with a transducer indicating pressure and position (18).
  2. Pre-rolling assembly as defined in claim 1, in which the load cells (15), the servovalves (19) and the pressure and position transducers (18) are associated with a control and data processing unit (21) comprising means for the insertion/introduction of the pre-rolling parameters and the characteristics of the liquid core.
  3. Pre-rolling assembly as defined in claim 1 or claim 2 for curved continuous casting, in which the stationary sector parts (13) are positioned on the outer curved side, or extrados side, of the thin slab.
EP92117271A 1991-10-31 1992-10-09 Assembly for the controlled prerolling of thin slabs leaving a continuous casting plant Expired - Lifetime EP0539784B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD910184A IT1252847B (en) 1991-10-31 1991-10-31 CONTROLLED PRE-LAMINATION GROUP FOR THIN SLABS OUT OF CONTINUOUS CASTING
ITUD910184 1991-10-31

Publications (3)

Publication Number Publication Date
EP0539784A1 EP0539784A1 (en) 1993-05-05
EP0539784B1 true EP0539784B1 (en) 1998-01-07
EP0539784B2 EP0539784B2 (en) 2004-01-07

Family

ID=11420941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117271A Expired - Lifetime EP0539784B2 (en) 1991-10-31 1992-10-09 Assembly for the controlled prerolling of thin slabs leaving a continuous casting plant

Country Status (5)

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EP (1) EP0539784B2 (en)
AT (1) ATE161761T1 (en)
DE (1) DE69223917T3 (en)
ES (1) ES2111030T3 (en)
IT (1) IT1252847B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1262116B (en) * 1993-05-17 1996-06-19 Danieli Off Mecc CONTROLLED PRELAMINATION PROCEDURE FOR THIN SLABS OUT OF CONTINUOUS CASTING AND RELATED DEVICE
US5488987A (en) * 1991-10-31 1996-02-06 Danieli & C. Officine Meccaniche Spa Method for the controlled pre-rolling of thin slabs leaving a continuous casting plant, and relative device
DE4338805C2 (en) * 1993-11-12 1995-10-26 Schloemann Siemag Ag Method and device for operating a continuous caster
TW297788B (en) * 1994-12-15 1997-02-11 Sumitomo Metal Ind
IT1280171B1 (en) * 1995-05-18 1998-01-05 Danieli Off Mecc VERTICAL CASTING LINE FOR BRAMME
DE69601409T2 (en) * 1995-11-28 1999-09-02 Danieli Off Mecc Method and device for the controlled roughing of thin slabs emerging from a continuous casting plant
DE19817034A1 (en) * 1998-04-17 1999-10-21 Schloemann Siemag Ag Continuous casting of thin metal slabs
DE102006027066A1 (en) 2006-06-10 2007-12-13 Sms Demag Ag Apparatus and method for guiding a belt
DE102009031651A1 (en) * 2009-07-03 2011-01-05 Sms Siemag Aktiengesellschaft Method for determining the position of the sump tip of a cast metal strand and continuous casting plant
CN107138700A (en) * 2017-04-01 2017-09-08 河钢股份有限公司承德分公司 A kind of method of without gap sensors continuous casting machine fan-shaped segment control
DE102017109713A1 (en) 2017-05-05 2018-11-08 Data M Sheet Metal Solutions Gmbh Rollforming machine with sensor roll forming frame

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62130759A (en) * 1985-12-02 1987-06-13 Sumitomo Metal Ind Ltd Method for controlling leveling roll for continuously cast steel ingot
JPS62263854A (en) † 1986-05-12 1987-11-16 Kawasaki Steel Corp Prevention method for molten steel spout-out from end part of continuous casting slab
JPS63242452A (en) † 1987-03-30 1988-10-07 Nkk Corp Method for casting by light rolling reduction
JPS63278655A (en) * 1987-05-12 1988-11-16 Nkk Corp Light rolling reduction casting method
JPH01271047A (en) * 1988-04-20 1989-10-30 Sumitomo Metal Ind Ltd Light rolling reduction method in continuous casting machine
DE3907905C2 (en) * 1988-07-04 1999-01-21 Mannesmann Ag Continuous casting process
IT1244295B (en) * 1990-07-09 1994-07-08 Giovanni Arvedi PROCESS AND PLANT FOR THE OBTAINING OF WRAPPED STEEL BELTS, WITH CHARACTERISTICS OF COLD ROLLED PRODUCTS OBTAINED DIRECTLY IN HOT ROLLING LINE

Also Published As

Publication number Publication date
DE69223917T2 (en) 1998-08-27
ES2111030T3 (en) 1998-03-01
DE69223917T3 (en) 2004-07-22
ITUD910184A1 (en) 1993-05-01
EP0539784B2 (en) 2004-01-07
EP0539784A1 (en) 1993-05-05
DE69223917D1 (en) 1998-02-12
ITUD910184A0 (en) 1991-10-31
IT1252847B (en) 1995-06-28
ATE161761T1 (en) 1998-01-15

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