EP3231533B1 - Appareil pour la mise en marche automatique d'une ligne de coulée continue - Google Patents

Appareil pour la mise en marche automatique d'une ligne de coulée continue Download PDF

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Publication number
EP3231533B1
EP3231533B1 EP17000615.9A EP17000615A EP3231533B1 EP 3231533 B1 EP3231533 B1 EP 3231533B1 EP 17000615 A EP17000615 A EP 17000615A EP 3231533 B1 EP3231533 B1 EP 3231533B1
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EP
European Patent Office
Prior art keywords
metal
vessel
level
tip
casting
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.)
Active
Application number
EP17000615.9A
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German (de)
English (en)
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EP3231533A1 (fr
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
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Bruno Presezzi SpA
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Publication of EP3231533A1 publication Critical patent/EP3231533A1/fr
Application granted granted Critical
Publication of EP3231533B1 publication Critical patent/EP3231533B1/fr
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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.
  • CN101612651 discloses a front box device, for roll-casting of a magnesium alloy, having an automatic liquid level control and capable of monitor the flow rate of the magnesium liquid by a laser liquid level detector, so that the magnesium liquid meeting process requirements is sent to the casting nozzle in the end, and the process requirements on the roll-casting of magnesium are met. CN101612651 does not provide for an automatic startup of the line.
  • GB2524962 discloses a method and apparatus for carrying out strip casting, wherein the continuous casting apparatus is a twin roll casting apparatus having a form adjustment system comprising a dam to determine the cross sectional form of the molten metal feed to an opposing cooling means.
  • the dam is an AC electromagnetic field dam provided by an electromagnet.
  • 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.
  • 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)

Claims (2)

  1. Appareil pour la mise en marche automatique d'une ligne de coulée continue pour la production de bandes d'aluminium ou de zinc, comprenant une cuve (9) qui est reliée à une pointe (2) au moyen d'une porte, ladite pointe (2) alimentant un carter de coulée (3, 4); un dispositif laser (12) qui mesure le niveau de métal à l'intérieur de ladite cuve (9), un dispositif de commande de niveau (7) qui ajuste l'introduction du métal liquide à l'intérieur de ladite cuve (9); ledit appareil étant caractérisé en ce qu'il comprend un déclencheur de porte (13) commandant ladite porte pour fournir une barrière entre la cuve (9) et la pointe (2); ladite porte comprenant une barrière réfractaire; un thermocouple (14) étant un transducteur (14) pour la température du métal à l'intérieur de ladite cuve (9), et une unité de gestion électronique; ladite unité de gestion électronique recevant des données venant dudit transducteur de température (14) et dudit dispositif laser (12) afin de commander ledit dispositif de commande de niveau (7) et ledit actionneur de porte (13), ajustant le niveau dudit métal dans ladite cuve (9) afin d'assurer un écoulement correct et continu de métal vers ledit carter de coulée (3, 4).
  2. Appareil selon la revendication 1, caractérisé en ce que ladite unité de gestion électronique comprend un automate programmable.
EP17000615.9A 2016-04-13 2017-04-11 Appareil pour la mise en marche automatique d'une ligne de coulée continue Active EP3231533B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A002539A ITUA20162539A1 (it) 2016-04-13 2016-04-13 Apparecchiatura per l’avviamento automatico di una linea di colata continua

Publications (2)

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

Family

ID=56507708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17000615.9A Active EP3231533B1 (fr) 2016-04-13 2017-04-11 Appareil pour la mise en marche automatique d'une ligne de coulée continue

Country Status (5)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315058A (zh) * 2019-05-15 2019-10-11 何秦 一种全自动浇铸一体成型系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9803810D0 (en) * 1998-02-25 1998-04-22 Kvaerner Metals Cont Casting Improvements in and relating to casting
FR2806947B1 (fr) * 2000-04-04 2002-08-09 Pechiney Rhenalu Procede et dispositif de controle du niveau de metal d'une machine de coulee continue
CN101612651A (zh) * 2009-07-10 2009-12-30 苏州有色金属研究院有限公司 镁合金铸轧用前箱装置
GB2524962B (en) * 2014-04-07 2016-12-07 Cambridge Entpr Ltd Strip casting

Also Published As

Publication number Publication date
ITUA20162539A1 (it) 2017-10-13
PL3231533T3 (pl) 2023-05-08
EP3231533A1 (fr) 2017-10-18
ES2938264T3 (es) 2023-04-05
US20170297093A1 (en) 2017-10-19

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