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WO2005053878A2 - Buse de coulee avec bec externe - Google Patents

Buse de coulee avec bec externe Download PDF

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Publication number
WO2005053878A2
WO2005053878A2 PCT/US2004/039674 US2004039674W WO2005053878A2 WO 2005053878 A2 WO2005053878 A2 WO 2005053878A2 US 2004039674 W US2004039674 W US 2004039674W WO 2005053878 A2 WO2005053878 A2 WO 2005053878A2
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
bottom face
sidewalls
baffle
baffles
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.)
Ceased
Application number
PCT/US2004/039674
Other languages
English (en)
Other versions
WO2005053878A3 (fr
Inventor
Lei Zhou
Quentin Robinson
Dong Xu
Lawrence J. Heaslip
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.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
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 Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Publication of WO2005053878A2 publication Critical patent/WO2005053878A2/fr
Publication of WO2005053878A3 publication Critical patent/WO2005053878A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention generally relates to nozzles used for the continuous casting of liquid metal. More specifically, the present invention relates to an improved nozzle having a plurality of outlets.
  • TSC Thin-slab continuous casting
  • liquid metal and in particular liquid steel
  • a casting nozzle used for TSC is fashioned from refractory ceramic materials and is shaped to fit within the upper portion of the mold cavity.
  • the shape of the casting nozzle takes the form of a tube with a generally cylindrical upper portion and a generally flat lower portion. The flat lower portion is generally wider and thinner than the upper cylindrical portion.
  • the casting nozzle has a central bore that serves as a flow channel through which the liquid metal flows as it moves through the nozzle.
  • Liquid metal enters the flow channel at the upper end of the casting nozzle, flows through the flow channel, and exits from the outlet end of the flow channel in the lower portion of the casting nozzle.
  • Baffles are often located at the outlet end of the flow channel.
  • the lower portion of the flow channel contains at least one baffle that divides the flow channel into at least two outlets through which the liquid metal is discharged from the nozzle into the mold.
  • the refractory body of the casting nozzle experiences intense transient stresses during use. These stresses concentrate along the narrow sides of the lower portion of the nozzle and in the region of the baffles during use. These stresses become particularly severe during certain steps of the casting process. For example, during nozzle pre-heating, the start of liquid metal flow through the nozzle, and the initial immersion of the nozzle into the liquid metal pool accumulated in the mold.
  • the casting nozzle is subjected to rapid temperature changes and high stress concentrations that can cause cracking of the refractory body of the nozzle.
  • the cracking can lead to the leaking of air into the nozzle, or the leaking of liquid metal out of the nozzle, and even to nozzle breakage during use. Leaking and nozzle breakage can lead to casting process disruptions and degradation of cast metal quality.
  • at least one baffle connects the front refractory wall of the nozzle to the back refractory wall of the nozzle, dividing the flow channel so as to define a plurality of outlets. The baffles do not extend beyond the outer edge of the flow channel.
  • FIG. 1 shows the lower portion of a traditional casting nozzle 10 with one baffle 12 dividing the flow channel 14 into two outlets 16, 18.
  • FIG. 1(c) illustrates some of the typical locations of cracking 22, 24, 26 found in the nozzle 10.
  • FIG. 2 shows the lower portion of another casting nozzle 30 having three baffles 31, 32, 33 dividing the flow channel 34 into four outlets 36, 37, 38, 39.
  • FIG. 2(c) also illustrates the typical locations of cracking 42, 44, 46 in the casting nozzle 30.
  • Nozzles such as those illustrated in FIGS. 1 and 2 are subject to cracking of the refractory body as the result of the concentration of stress in certain regions.
  • the first stage of cracking includes the formation of cracks in the baffles. This first stage may also be accompanied by cracking of the sidewalls at their lower edges.
  • the second stage of cracking involves the propagation and growth of the baffle cracks. If a crack in a baffle grows to completely break the connection of the baffle between the front and back refractory walls of the nozzle, the stress concentrations in the sidewalls are intensified, causing the third stage of cracking. In the third stage of cracking, sidewall cracks either, initiate at the lower sidewall edges and subsequently grow larger, or sidewall cracks already present are caused to grow. In ether case, sidewall cracks may continue to grow until complete failure of the nozzle occurs. Summary of the invention.
  • FIG. 1a is a cross-sectional view of a traditional casting nozzle.
  • FIG. 1b is a perspective view of the casting nozzle of FIG. 1a.
  • FIG. 1c is a perspective view of the casting nozzle of FIG. 1a, illustrating typical cracking locations.
  • FIG. 2a is a cross-sectional view of a traditional casting nozzle.
  • FIG. 2b is a perspective view of the casting nozzle of FIG. 2a.
  • FIG. 2c is a perspective view of the casting nozzle of FIG. 2a, illustrating typical cracking locations.
  • FIG. 3 is a cross-sectional view of a casting nozzle in accordance with a first embodiment of the present invention.
  • FIG. 4 is a perspective view of the casting nozzle of FIG. 3.
  • FIG. 5 is a cross-sectional view of a casting nozzle in accordance with an alternate embodiment of the present invention.
  • FIG. 6 is a perspective view of the casting nozzle of FIG. 5
  • FIGS. 3 and 4 illustrates the lower portion of a casting nozzle 50 in accordance with an embodiment of the present invention.
  • the nozzle 50 comprises two sidewalls 51 and a bottom face 58 connecting the two sidewalls 51 , thereby defining a central bore 52 through the nozzle
  • the nozzle 50 further comprises at least one aperture 56 in the bottom face 58 of the nozzle 50 and at least one baffle 54 located within the aperture connecting the two sidewalls 51.
  • the baffle 54 thereby divides the aperture 56 into a plurality of outlets.
  • the nozzle 50 is characterized in that at least one of the baffles 54 at least partially extends beyond the bottom face 58 of the nozzle 50.
  • the nozzle 50 preferably comprises three baffles 54 that divide the aperture 56 into four outlets.
  • baffles 54 that extend beyond the bottom face 58.
  • the extension of a baffle 54 beyond the bottom face 58 may take the form of a protruding nose or protrusion 55.
  • the protruding nose 55 of a baffle 54 has the general shape of a dome, and this dome-like shape is on the exterior of the bottom face 58 of the nozzle 50.
  • the dome like-shape can be trapezoidal or smoothly curved as shown in FIG.4, but the protrusion 55 of the baffle 54 must extend beyond the bottom face 58 of the nozzle 50.
  • the interior portion 53 of the baffle 54 that is between the sidewalls 51 still serves the traditional purpose of dividing the flow of the molten metal in the central bore 52 into several flow streams that exit the nozzle 50 through the plurality of outlets.
  • protruding nose 55 of the baffle 54 may extend out any distance from the bottom face 58 of the nozzle 50, it is preferable that the distance of extension of the protrusion
  • the thickness of the central bore 52 is defined as the distance of separation between the two sidewalls 51ot the nozzle 50.
  • FIGS. 5 and 6 illustrate the lower portion of a casting nozzle 70 in accordance with an embodiment of the present invention.
  • the nozzle 70 comprises two sidewalls 71 and a bottom face 78 connecting the two sidewalls 71, thereby defining a central bore 72 through the nozzle 70.
  • the nozzle 70 further comprises at least one aperture 76 in the bottom face 78 of the nozzle 70 and at least one baffle 74 located within the aperture connecting the two sidewalls 71.
  • the baffle 74 thereby divides the aperture 76 into a plurality of outlets.
  • the nozzle 70 is characterized in that at least one of the baffles 74 at least partially extends beyond the bottom face 78 of the nozzle 70.
  • the nozzle 70 preferably comprises three baffles 74 that divide the aperture 76 into four outlets.
  • baffles 74 that extend beyond the bottom face 78.
  • the extension of a baffle 74 beyond the bottom face 78 may take the form of a protruding nose or protrusion 75.
  • the protruding nose 75 of a baffle 74 has the general shape of a section of a cylinder, and this cylindrical-section shape is on the exterior of the nozzle body.
  • the protruding nose could have the shape of a section of a pyramid, trapezoid, or rectangular box, although a curved convex surface as shown in FIG. 6 is preferable.
  • the protrusion 75 of the baffle 74 must extend beyond the bottom face 78 of the nozzle 70.
  • the interior portion 73 of the baffle 74 that is between the sidewalls 71 still serves the traditional purpose of dividing the flow of the molten metal in the central bore 72 into several flow streams that exit the nozzle 70 through the plurality of outlets.
  • the protruding nose 75 of the baffle 74 may extend out any distance from the bottom face 78 of the nozzle 70, it is preferable that the distance of extension of the protrusion 75 beyond the bottom face 78 of the nozzle be at least equal to one-half of the thickness of the central bore 72 in the region of the baffle 74.
  • the thickness of the central bore 72 is defined as the distance of separation between the two sidewalls 71 of the nozzle 70.
  • a characteristic feature of a casting nozzle of the present invention is the incorporation into the nozzle body of an external protrusion on a baffle.
  • the presence of an external baffle protrusion significantly diminishes stress concentrations in all of the critical regions in the lower nozzle body and significantly reduces the sensitivity of the nozzle body to cracking during nozzle preheating, start of liquid metal flow through the nozzle, and initial immersion of the nozzle into the liquid metal accumulated in the mold, or any other occasion when the casting nozzle is subjected to rapid temperature changes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne une buse utilisée dans la coulée continue d'un métal fondu et comprenant deux parois latérales et une face inférieure reliant les deux parois latérales. Un alésage central traverse la buse. Cette buse comporte en outre au moins une ouverture située dans la face inférieure de la buse et au moins une chicane située dans l'ouverture et reliant les deux parois latérales. La chicane divise l'ouverture en une pluralité de sorties. Ladite buse se caractérise en ce que l'une au moins des chicanes s'étend partiellement au-delà de la face inférieure de la buse.
PCT/US2004/039674 2003-11-26 2004-11-24 Buse de coulee avec bec externe Ceased WO2005053878A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52553203P 2003-11-26 2003-11-26
US60/525,532 2003-11-26

Publications (2)

Publication Number Publication Date
WO2005053878A2 true WO2005053878A2 (fr) 2005-06-16
WO2005053878A3 WO2005053878A3 (fr) 2005-11-24

Family

ID=34652350

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/039674 Ceased WO2005053878A2 (fr) 2003-11-26 2004-11-24 Buse de coulee avec bec externe

Country Status (1)

Country Link
WO (1) WO2005053878A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9162284B2 (en) 2006-06-01 2015-10-20 Refractory Intellectual Property Gmbh & Co Kg Casting nozzle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1267242B1 (it) * 1994-05-30 1997-01-28 Danieli Off Mecc Scaricatore per bramme sottili
UA51734C2 (uk) * 1996-10-03 2002-12-16 Візувіус Крусібл Компані Занурений стакан для пропускання рідкого металу і спосіб пропускання рідкого металу через нього

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9162284B2 (en) 2006-06-01 2015-10-20 Refractory Intellectual Property Gmbh & Co Kg Casting nozzle

Also Published As

Publication number Publication date
WO2005053878A3 (fr) 2005-11-24

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