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
  • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
  • B22D41/01—Heating means
  • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
• • 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
  • B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
• • 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
  • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring

Definitions

• the present invention relates to a device for the production of metallurgical products, continuously, from the solidification of a steel casting leaving the ladle. It relates more particularly to improvements made to the continuous casting distributors.
• These enclosures are metallurgical vessels coated with refractory materials making it possible to decant and then direct the liquid steel towards the continuous casting molds.
• conventional distributors include a weir area limited by dams into which the liquid steel is poured from a pocket. On each side of this weir area, the container has an outlet for emptying the distributor to the continuous casting molds. The dams act as a siphon so that the liquid steel is decanted.
• the continuous casting mold is the place where the steel passes from the liquid state to the solid state in the form of slabs, blooms or billets.
• the temperature at which the liquid steel enters the continuous casting mold must be precisely regulated so that the liquid steel neither freezes too soon nor too late. This temperature depends on the treatments undergone by the upstream liquid steel
• Distributors are thus known equipped with a plasma torch, this torch was designed to heat the liquid steel in the distributor.
• the purpose of plasma heating is to increase and regulate the temperature of the liquid steel which leaves the ladle, which by mixing effect, leads to maintaining the temperature of the liquid steel in the distributor in a narrow and controlled range.
• This type of distributor therefore includes a heating chamber between the overflow zone and the distributor distribution zone.
• the heating chamber is separate from the overflow zone thanks to dams so as, inter alia, to avoid the passage of slag which would limit the yield of the operation.
• the heating chamber is covered with a dome to prevent air from entering, reduce heat loss and oxidation of the liquid steel.
• the liquid steel flow system between the bag emptying area (weir area) and the plasma heating chamber must promote sufficient speeds of the liquid steel to orient it under impact. of the plasma torch arc and must ensure efficient mixing of the liquid steel bath.
• Distributors not provided with a means for heating the molten steel do not allow obtaining in the continuous casting mold a steel at the desired solidification temperature and for distributors equipped with a heating means consisting of a plasma torch, the major drawback lies in the fact that the impact of the arc of the plasma torch is very localized on the surface of the steel bath, the area heated by the arc is therefore also. It is therefore important that the steel jet coming from the weir area is directed precisely under the arc. Until now, the j and is directed towards the arc by a more or less inclined plane dam. These distributors do not allow the j ez to be directed as precisely as desired.
• the present invention therefore aims to overcome these drawbacks, by proposing a device for guiding molten liquid steel in the direction of the zone swept by the arc of a plasma torch, allowing the maintenance and regulation within a narrow range. and controlled the temperature of the liquid steel bath in the distributor.
• the guide device located between the spillway zone and the distribution zone of a distributor provided with a heating system, in particular a plasma torch, and constituting a rib where the chaneffe cnambre, characterized in that it comprises a refractory block pierced with at least one duct having the shape of a truncated cone and curved towards the predefined zone of the heating chamber and which can be flared at the level of this zone, so as to ensure unidirectional guiding of the flow of liquid steel from the overflow zone towards the predefined zone of the heating chamber.
• - Figure 1 is a view, in front elevation and in section, of a distributor according to the prior art
• - Figure 2 is a view, in front elevation and in section, of a distributor provided with the guide device according to the invention
• - Figure 3 is a sectional and plan view of the guide device;
• - Figure 4 is a sectional view in side elevation of the guide device;
• - Figure 5 is a sectional view in front elevation of a guide device according to another embodiment
• - Figure 6 is a perspective view of the guide device according to the invention
• the guiding device comprises a barrier block 1, placed within a distributor 2 between a spillway zone 3 and a distribution zone 4, forming a third zone called the heating zone 5.
• This dam block 1 made of a refractory material, abrasion resistant, possibly monolithic, comprises three zones: on the one hand, a lateral zone ⁇ , similar to the overflow zone 3 of a conventional distributor 2, delimited by walls 7 in particular inclined forming a dam, and on the other hand, in its lower part 8 a flow duct 9 for the liquid steel coming from the overflow zone 3 in the direction of the distribution zone 4, passing through a heating chamber 5 communicating with said distribution zone 4.
• a plate 16 also made of refractory material, is placed facing said flow conduit 9, and substantially in a horizontal direction, forming a barrier and delimiting the heating chamber 5, so as to allow the liquid steel to flow towards the distribution zone 4.
• the lower part 8 of the dam block 1 is crossed by at least one flow conduit 9 for the molten steel extending between the overflow zone 3 and the heating cylinder 5.
• This conduit 9 firstly travels in part bottom of the dam block 1 in a direction substantially coplanar with the wall 10 constituting the bottom of the distributor 2, then forms a bend oriented perpendicularly in the vertical plane, which opens at the top into the heating chamber 5, in a flared area 11 in particular in the shape of a tulip.
• This flow conduit 9 therefore constitutes a portion of U-shaped tube, which allows a circulation of liquid between the overflow zone 3 and the heating circuit 5 thanks to the classic principle of communicating vessels.
• the sludge end zone 11 or conduit 9 determines by its geometry, a control of the speed ⁇ 1 ection of the jet of molten steel, according to a desired speed profile for obtaining a hydrodynamic mixing allowing a homogeneous mixture of the steel in the heating chamber 5.
• this heating member 12 is constituted by a plasma torch, the arc of which is directed and focused above the entire surface formed by the terminal zone flared 11 of the jet ejection duct 9, thus avoiding unsuitable residence times of the steel in the heating chamber 5.
• the steel supernatant in the heating chamber 5 flows, by stirring, laterally towards the distribution zone.
• the barrier block 1 is traversed right through, radially between the overflow zone 3 and the heating chamber 5, by a plurality of conduits 13 extending in a direction substantially parallel with respect to the flat surface defined by the upper part of the flared end zone 11 of the steel jet ejection conduit 9 in the direction of the overflow zone 3; these conduits 13 form zones for holding the thermomechanical stresses which occur within the dam block 1 when the weir area is filled.
• the refractory barrier block 1 comprises at least one lateral conduit 17 opening into each distribution zone 4 and into the lower part of the flow conduit 9, so as to ensure complete emptying of the zone weir 3 at the end of casting.
• conduits 9, 13 or 17 they are no longer obtained from the molding of the monolithic dam block 1, but are composed of inserts 9 ′, 13 ′, 17 ′, also made of a material refractory, possibly having different physico-chemical properties with respect to the material forming the barrier block and advantageously a material having characteristics of high resistance to abrasion.
• the heating chamber 5 is covered by a screen 15 in the shape of a dome, making it possible, on the one hand, to limit as much as possible the parasitic air inlets and therefore the sources of oxidation of the steel bath and on the other hand to constitute a protective screen in order to reduce the thermal losses.
• the barrier block 1 is placed between a weir area 3 and a distribution zone 4.
• the barrier block 1 delimits by its front wall, forming a main barrier, the separation between these two zones, and they communicate via the flow conduit 9.
• the side walls 7 of this barrier block 1 also conform to secondary barrier zones inside the distribution zone 4.
• the side walls 7, disposed within this distribution zone 4, are of height less than the overall height of the barrier block 1. They thus delimit in their lower part a passage zone for the metal coming from the heats 5 towards distribution zones 4 laterally adjacent to these walls 7.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=9463459

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (7)

• 1994
  • 1994-05-24 FR FR9406279A patent/FR2720307B1/fr not_active Expired - Fee Related
• 1995
  • 1995-05-24 CA CA002167830A patent/CA2167830A1/fr not_active Abandoned
  • 1995-05-24 WO PCT/FR1995/000679 patent/WO1995032069A1/fr not_active Application Discontinuation
  • 1995-05-24 US US08/583,022 patent/US5662862A/en not_active Expired - Fee Related
  • 1995-05-24 JP JP7530106A patent/JPH09505776A/ja active Pending
  • 1995-05-24 EP EP95920982A patent/EP0711216A1/de not_active Ceased

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events