EP3231533A1 - Apparatus for the automatic startup of a continuous casting line - Google Patents

Apparatus for the automatic startup of a continuous casting line Download PDF

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Publication number
EP3231533A1
EP3231533A1 EP17000615.9A EP17000615A EP3231533A1 EP 3231533 A1 EP3231533 A1 EP 3231533A1 EP 17000615 A EP17000615 A EP 17000615A EP 3231533 A1 EP3231533 A1 EP 3231533A1
Authority
EP
European Patent Office
Prior art keywords
vessel
metal
level
tip
gate
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
EP17000615.9A
Other languages
German (de)
French (fr)
Other versions
EP3231533B1 (en
Inventor
Alberto Presezzi
Giovanni Sardara
Raffaele VERONESE
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.)
Bruno Presezzi SpA
Original Assignee
Bruno Presezzi SpA
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 Bruno Presezzi SpA filed Critical Bruno Presezzi SpA
Publication of EP3231533A1 publication Critical patent/EP3231533A1/en
Application granted granted Critical
Publication of EP3231533B1 publication Critical patent/EP3231533B1/en
Active legal-status Critical Current
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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/185—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using optical means

Definitions

  • the present invention relates to an apparatus for the automatic startup of a continuous casting line, particularly for the production of aluminum or zinc strips.
  • the invention relates to a system installed in a caster for controlling the flow of metal with which the tip of the caster is fed.
  • the startup of a continuous casting machine is a completely manual operation effected by the operator, the person in charge of the caster line, until the standard production conditions are reached, which include:
  • the startup is in fact a very delicate operation that determines the final quality of the product.
  • the duration of a startup is around 15-20 minutes and the operations to be performed are numerous and must be performed in a timely and sequential manner, considering the duration of the event, which is limited.
  • the startup of a continuous casting for aluminum or zinc consists in making liquid metal flow by means of casting channels, passing through a vessel known as a head box, which has a barrier at the end in order to prevent the access of the liquid metal to the inside of the tip while waiting for the required metal temperature to be reached (for aluminum approximately 735°C and 470°C for zinc), the metal is conveyed into the collection vessels (ladles).
  • the operator throttles the flow of metal by means of the level control (actuator), using the manual closing/opening controls that are present on the control post.
  • the operator prepares for removal of the manual barrier (monolith plate) arranged in the end of the head box, making the liquid metal converge toward the inlet of the tip; in this operation, which lasts approximately 20-30 seconds, the operator must pay maximum attention to correctly dosing the quantity of metal, then he must adjust the flow constantly and precisely, assisted by the commands of the operators who wait for the solid strip at the output of the caster (on the front part of the cylinders), until the tip is completely filled.
  • the manual barrier monolith plate
  • the operator controls the level detected by the laser that is present above the head box.
  • the operator engages the automatic metal level adjustment control by pressing the "automatic level” button.
  • This function provides for the flow regulator (actuator) to enter a symbiosis with the laser, giving rise to an automatic adjustment, using the latter as feedback for the closure of the PID adjustment loop.
  • the spraying system is fundamental in order to avoid the adhesion of the aluminum strip on the casting cylinders; graphite performs the role of release agent and also is fundamental in the first minutes of casting; an excessive or insufficient quantity would compromise the continuation of casting.
  • the power-on of the water pump avoids an overheating of the jacket of the steel roller, usually the water must be activated after reaching the surface temperature of the jacket, not before 200°C in order to avoid thermal shocks to the steel, thus the operator must perform manual control, after ascertaining the temperature of the jacket he can proceed with flushing of the cooling water.
  • the aim of the present invention is to improve the prior art.
  • an object of the invention is to provide an apparatus which, in a continuous casting line, or caster, allows to perform the appropriate automatic adjustments in relation to the working conditions required to start the line automatically.
  • Another object of the present invention is to provide a reliable and safe apparatus.
  • an apparatus for the automatic starting of a continuous casting line comprising a vessel which is connected to a tip by means of a gate, the tip feeding a casting housing; the apparatus being characterized in that it includes a laser device which measures the level of the metal within the vessel, a level control device, which adjust the introduction of liquid metal into the vessel, a gate actuator to control the gate for providing a barrier between the vessel and the tip, a transducer for the temperature of the metal inside the vessel, and an electronic management unit; the electronic management unit receiving data from the temperature transducer and from the laser device in order to control the level control device and the gate actuator, adjusting the level of the metal in the vessel in order to ensure a correct and continuous flow of metal toward the casting housing.
  • the automatic starting apparatus is inserted in a continuous casting line for the production of aluminum or zinc strips, known as caster, which is shown schematically in Figure 2 .
  • the apparatus 1 according to the present invention is installed in the caster to control the flow of metal with which the nozzle, or tip, 2 is fed.
  • the tip 2 distributes the molten metal in a casting housing which is constituted by two casting rollers 3 and 4, which are water-cooled by means of a spraying system 5, where the molten metal is cooled and solidified to form a strip 6.
  • the molten metal flows in a channel 8, until it reaches a vessel 9, known as head box, which reaches the tip 2.
  • the strip 6 then passes through a series of apparatuses which include shears 10 and a winding spool 11.
  • the apparatus includes a laser device 12 for controlling the level of the metal inside the vessel 9, a level control device 7, which adjusts the introduction of the liquid metal in the vessel 9 and a gate actuator 13 for the control of the gate for providing a barrier between the vessel and the mouth of the tip.
  • the apparatus also has a temperature transducer, constituted by a thermocouple 14, for controlling the temperature of the metal in the vessel 9, and a PLC management unit with a corresponding operator panel.
  • the operation of the automatic control apparatus according to the present invention is as follows.
  • the molten metal is made to flow into the vessel 9, the end of which is blocked by the refractory barrier, i.e., the gate, which is not visible in the figures, connected to the motorized system constituted by the gate actuator 13, until the required parameters are reached.
  • the refractory barrier i.e., the gate
  • the electronic control system sends a command to the level control device 7, which reaches a set closure position, waiting to reach the preset level, through the drain channel, which is calibrated depending on the thickness of the strip, on the widths and on the alloys.
  • the level of the metal, previously established by a set point, is further confirmed by means of a reading performed by the laser device 12, which actuates the gate actuator 13 so that the motorized refractory barrier opens gradually and progressively, according to a positioning profile stored previously on a work recipe.
  • the level of the metal in the vessel 9 is adjusted by means of an automatic system, in order to ensure a correct and continuous flow of metal toward the casting rollers 3 and 4, in order to avoid poor diffusion of the metal within the tip 2, avoiding so-called freezing.
  • the level control device 7 communicating with the laser device 12, maintains the previously entered set point, i.e. the optimum casting level.
  • the automatic control system adjusts three other fundamental parameters: the speed of the rollers 3 and 4, the cooling water dispensed by the spraying system 5, and the release agent on the cylinders.
  • the invention has achieved the intended aim and objects, providing an apparatus for the automatic start of a continuous casting line that allows to obtain some important advantages with respect to traditional systems.
  • the present apparatus ensures an increase in startups performed successfully and a decrease in the waste of consumables (tip, end dam, fiber).
  • the apparatus according to the present invention furthermore offers an increase in productivity due to the higher percentage of startups completed successfully.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

An apparatus for the automatic startup of a continuous casting line, for example for the production of aluminum or zinc strips, including a vessel which is connected to a tip by means of a gate, the tip feeding a casting housing; the apparatus is characterized in that it includes a laser device which measures the level of the metal within the vessel, a level control device, which adjust the introduction of liquid metal into the vessel, a gate actuator to control the gate for providing a barrier between the vessel and the tip, a transducer for the temperature of the metal inside the vessel, and a PLC which receives data from the temperature transducer and from the laser device in order to control the level control device and the gate actuator, so as to adjust the level of the metal in the vessel in order to ensure a correct and continuous flow of metal toward the casting cylinders, in order to avoid poor diffusion of the metal inside the tip.

Description

  • The present invention relates to an apparatus for the automatic startup of a continuous casting line, particularly for the production of aluminum or zinc strips.
  • More particularly, the invention relates to a system installed in a caster for controlling the flow of metal with which the tip of the caster is fed.
  • Conventionally, the startup of a continuous casting machine is a completely manual operation effected by the operator, the person in charge of the caster line, until the standard production conditions are reached, which include:
    1. 1) metal level;
    2. 2) strip thickness;
    3. 3) line speed;
    4. 4) roller lubrication;
    5. 5) temperature of casting roller cooling water.
  • The startup of the continuous casting (caster), as well as control of the metal level, is a critical step in the operation of the system.
  • The startup is in fact a very delicate operation that determines the final quality of the product.
  • The entire operation is entrusted to the management of the line on the part of the operator, who, depending on his experience, might perform the operation more or less appropriately.
  • The duration of a startup is around 15-20 minutes and the operations to be performed are numerous and must be performed in a timely and sequential manner, considering the duration of the event, which is limited.
  • The startup of a continuous casting for aluminum or zinc consists in making liquid metal flow by means of casting channels, passing through a vessel known as a head box, which has a barrier at the end in order to prevent the access of the liquid metal to the inside of the tip while waiting for the required metal temperature to be reached (for aluminum approximately 735°C and 470°C for zinc), the metal is conveyed into the collection vessels (ladles).
  • Once the required temperature has been reached, the operator throttles the flow of metal by means of the level control (actuator), using the manual closing/opening controls that are present on the control post.
  • At this point the operator visually checks that the metal level that is present in the head box reaches the required level.
  • Once the level height has been reached, the operator prepares for removal of the manual barrier (monolith plate) arranged in the end of the head box, making the liquid metal converge toward the inlet of the tip; in this operation, which lasts approximately 20-30 seconds, the operator must pay maximum attention to correctly dosing the quantity of metal, then he must adjust the flow constantly and precisely, assisted by the commands of the operators who wait for the solid strip at the output of the caster (on the front part of the cylinders), until the tip is completely filled.
  • Once the colleagues upstream of the line, who are waiting for the solidification of the strip, have given clearance, the operator who is performing the starting operation must adjust the level by means of a flow regulator (actuator) by means of the manual controls (open/close button).
  • During the adjustment step, the operator controls the level detected by the laser that is present above the head box.
  • Once the level has stabilized, the operator engages the automatic metal level adjustment control by pressing the "automatic level" button.
  • This function provides for the flow regulator (actuator) to enter a symbiosis with the laser, giving rise to an automatic adjustment, using the latter as feedback for the closure of the PID adjustment loop.
  • During casting it is necessary to complete the rest of the operations, which are:
    • power-on of the spraying system (graphite);
    • power-on of the cylinder cooling water pump.
  • These two operations are manually controlled by the operator.
  • The spraying system is fundamental in order to avoid the adhesion of the aluminum strip on the casting cylinders; graphite performs the role of release agent and also is fundamental in the first minutes of casting; an excessive or insufficient quantity would compromise the continuation of casting.
  • The power-on of the water pump avoids an overheating of the jacket of the steel roller, usually the water must be activated after reaching the surface temperature of the jacket, not before 200°C in order to avoid thermal shocks to the steel, thus the operator must perform manual control, after ascertaining the temperature of the jacket he can proceed with flushing of the cooling water.
  • The aim of the present invention is to improve the prior art.
  • Within the scope of this aim, an object of the invention is to provide an apparatus which, in a continuous casting line, or caster, allows to perform the appropriate automatic adjustments in relation to the working conditions required to start the line automatically.
  • Another object of the present invention is to provide a reliable and safe apparatus.
  • This aim and these objects and others which will become better apparent hereinafter are achieved by an apparatus for the automatic starting of a continuous casting line, comprising a vessel which is connected to a tip by means of a gate, the tip feeding a casting housing; the apparatus being characterized in that it includes a laser device which measures the level of the metal within the vessel, a level control device, which adjust the introduction of liquid metal into the vessel, a gate actuator to control the gate for providing a barrier between the vessel and the tip, a transducer for the temperature of the metal inside the vessel, and an electronic management unit; the electronic management unit receiving data from the temperature transducer and from the laser device in order to control the level control device and the gate actuator, adjusting the level of the metal in the vessel in order to ensure a correct and continuous flow of metal toward the casting housing.
  • Further characteristics and advantages will become better apparent from the description of preferred but not exclusive embodiments of the invention, illustrated by way of nonlimiting example in the accompanying drawings, wherein:
    • Figure 1 is side view of the apparatus for the automatic starting of a continuous casting line, according to the present invention;
    • Figure 2 is a side view of a continuous casting line, for the production of aluminum or zinc strips, provided with the automatic starting apparatus according to the present invention.
  • With reference to the cited figures, the automatic starting apparatus according to the invention, globally designated by the reference numeral 1, is inserted in a continuous casting line for the production of aluminum or zinc strips, known as caster, which is shown schematically in Figure 2.
  • The apparatus 1 according to the present invention is installed in the caster to control the flow of metal with which the nozzle, or tip, 2 is fed.
  • The tip 2 distributes the molten metal in a casting housing which is constituted by two casting rollers 3 and 4, which are water-cooled by means of a spraying system 5, where the molten metal is cooled and solidified to form a strip 6.
  • The molten metal flows in a channel 8, until it reaches a vessel 9, known as head box, which reaches the tip 2.
  • The strip 6 then passes through a series of apparatuses which include shears 10 and a winding spool 11.
  • According to the present invention, the apparatus includes a laser device 12 for controlling the level of the metal inside the vessel 9, a level control device 7, which adjusts the introduction of the liquid metal in the vessel 9 and a gate actuator 13 for the control of the gate for providing a barrier between the vessel and the mouth of the tip.
  • The apparatus also has a temperature transducer, constituted by a thermocouple 14, for controlling the temperature of the metal in the vessel 9, and a PLC management unit with a corresponding operator panel.
  • The operation of the automatic control apparatus according to the present invention is as follows.
  • Initially, the molten metal is made to flow into the vessel 9, the end of which is blocked by the refractory barrier, i.e., the gate, which is not visible in the figures, connected to the motorized system constituted by the gate actuator 13, until the required parameters are reached.
  • Once the start temperature, measured by means of the thermocouple 14, has been reached, the electronic control system sends a command to the level control device 7, which reaches a set closure position, waiting to reach the preset level, through the drain channel, which is calibrated depending on the thickness of the strip, on the widths and on the alloys.
  • The level of the metal, previously established by a set point, is further confirmed by means of a reading performed by the laser device 12, which actuates the gate actuator 13 so that the motorized refractory barrier opens gradually and progressively, according to a positioning profile stored previously on a work recipe.
  • Once the filling of the tip 2 has been completed, the level of the metal in the vessel 9 is adjusted by means of an automatic system, in order to ensure a correct and continuous flow of metal toward the casting rollers 3 and 4, in order to avoid poor diffusion of the metal within the tip 2, avoiding so-called freezing.
  • During the entire starting step, the level control device 7, communicating with the laser device 12, maintains the previously entered set point, i.e. the optimum casting level.
  • Once the casting strip has formed, the automatic control system adjusts three other fundamental parameters: the speed of the rollers 3 and 4, the cooling water dispensed by the spraying system 5, and the release agent on the cylinders.
  • In practice it has been found that the invention has achieved the intended aim and objects, providing an apparatus for the automatic start of a continuous casting line that allows to obtain some important advantages with respect to traditional systems.
  • The present apparatus ensures an increase in startups performed successfully and a decrease in the waste of consumables (tip, end dam, fiber).
  • The apparatus according to the present invention furthermore offers an increase in productivity due to the higher percentage of startups completed successfully.

Claims (4)

  1. An apparatus for the automatic startup of a continuous casting line, comprising a vessel which is connected to a tip by means of a gate, said tip feeding a casting housing; said apparatus being characterized in that it comprises a laser device which measures the level of the metal within said vessel, a level control device, which adjust the introduction of liquid metal into said vessel, a gate actuator to control said gate for providing a barrier between the vessel and the tip, a transducer for the temperature of the metal inside said vessel, and an electronic management unit; said electronic management unit receiving data from said temperature transducer and from said laser device in order to control said level control device and said gate actuator, adjusting the level of said metal in said vessel in order to ensure a correct and continuous flow of metal toward said casting housing.
  2. The apparatus according to claim 1, characterized in that said electronic management unit comprises a PLC.
  3. The apparatus according to claim 1, characterized in that said temperature transducer comprises a thermocouple.
  4. The apparatus according to claim 1, characterized in that said gate comprises a refractory barrier.
EP17000615.9A 2016-04-13 2017-04-11 Apparatus for the automatic startup of a continuous casting line Active EP3231533B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A002539A ITUA20162539A1 (en) 2016-04-13 2016-04-13 EQUIPMENT FOR THE AUTOMATIC STARTING OF A CONTINUOUS CASTING LINE

Publications (2)

Publication Number Publication Date
EP3231533A1 true EP3231533A1 (en) 2017-10-18
EP3231533B1 EP3231533B1 (en) 2022-11-23

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EP17000615.9A Active EP3231533B1 (en) 2016-04-13 2017-04-11 Apparatus for the automatic startup of a continuous casting line

Country Status (5)

Country Link
US (1) US20170297093A1 (en)
EP (1) EP3231533B1 (en)
ES (1) ES2938264T3 (en)
IT (1) ITUA20162539A1 (en)
PL (1) PL3231533T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315058A (en) * 2019-05-15 2019-10-11 何秦 A kind of full-automatic casting integrated molding system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334793A (en) * 1998-02-25 1999-09-01 Kvaerner Metals Cont Casting Controlling a continuous casting process
WO2001074517A1 (en) * 2000-04-04 2001-10-11 Pechiney Rhenalu Method and device for controlling metal liquid level in a continuous casting machine
CN101612651A (en) * 2009-07-10 2009-12-30 苏州有色金属研究院有限公司 Front box device for roll-casting of magnesium alloy
GB2524962A (en) * 2014-04-07 2015-10-14 Cambridge Entpr Ltd Strip casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334793A (en) * 1998-02-25 1999-09-01 Kvaerner Metals Cont Casting Controlling a continuous casting process
WO2001074517A1 (en) * 2000-04-04 2001-10-11 Pechiney Rhenalu Method and device for controlling metal liquid level in a continuous casting machine
CN101612651A (en) * 2009-07-10 2009-12-30 苏州有色金属研究院有限公司 Front box device for roll-casting of magnesium alloy
GB2524962A (en) * 2014-04-07 2015-10-14 Cambridge Entpr Ltd Strip casting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MARTIN MCBRIEN ET AL: "Tailor Blank Casting-Control of sheet width using an electromagnetic edge dam in aluminium twin roll casting", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 224, 1 April 2015 (2015-04-01), pages 60 - 72, XP055200043, ISSN: 0924-0136, DOI: 10.1016/j.jmatprotec.2015.03.034 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315058A (en) * 2019-05-15 2019-10-11 何秦 A kind of full-automatic casting integrated molding system

Also Published As

Publication number Publication date
PL3231533T3 (en) 2023-05-08
ES2938264T3 (en) 2023-04-05
EP3231533B1 (en) 2022-11-23
US20170297093A1 (en) 2017-10-19
ITUA20162539A1 (en) 2017-10-13

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