EP0348110A1 - Tauchgiessen - Google Patents

Tauchgiessen Download PDF

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Publication number
EP0348110A1
EP0348110A1 EP89306123A EP89306123A EP0348110A1 EP 0348110 A1 EP0348110 A1 EP 0348110A1 EP 89306123 A EP89306123 A EP 89306123A EP 89306123 A EP89306123 A EP 89306123A EP 0348110 A1 EP0348110 A1 EP 0348110A1
Authority
EP
European Patent Office
Prior art keywords
duct
tube
pouring tube
pouring
molten metal
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.)
Withdrawn
Application number
EP89306123A
Other languages
English (en)
French (fr)
Inventor
Gilbert Clive Hinckley
William Albert Griffiths
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.)
Flogates Ltd
Original Assignee
Flogates Ltd
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 Flogates Ltd filed Critical Flogates Ltd
Publication of EP0348110A1 publication Critical patent/EP0348110A1/de
Withdrawn legal-status Critical Current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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the present invention relates to improvements in submerged pouring of molten metals.
  • a submerged pouring nozzle has its discharge end dipped beneath the surface of molten metal already present in the receiving vessel.
  • Submerged pouring techniques to which this invention applies are used, by way of example, in the iron and steel industry.
  • the metal may be poured via a submerged pouring tube from a supply vessel such as a ladle into a mould, tundish or degassing vessel, or from either of the latter into a mould.
  • the latter may be a continuous caster mould.
  • a typical continuous casting plant has the mould fed with molten metal from a tundish which continuously contains molten metal.
  • the molten metal in the tundish is supplied by submerged pouring from a ladle and when the ladle has been emptied a fresh ladle, containing molten metal is brought to the tun­ dish to maintain the supply of molten metal thereto.
  • An object of this invention is to overcome the foregoing problems, and the object is met by safely venting the submerged pouring tube.
  • a pouring tube for use in the submerged pouring of molten metal from one vessel to another, wherein the tube incorporates a venting duct having air inlet and outlet ports respectively inside and outside the tube, the outlet being so located that, when the tube in use has its discharge end submerged in molten metal, the outlet port is above the said metal, the vent duct being operable to discharge air displaced from the tube when teeming of metal therethrough is commenced.
  • Submerged pouring tubes according to the in­vention can be fitted to vessels having bottom pour openings controlled by stopper rod or sliding gate valve systems.
  • venting duct is at least partly destroyed by the molten metal in the course of teeming from the vessel.
  • the submerged pouring tube may be fit for reuse. Its service life may span sev­eral filling and teeming cycles.
  • the invention compre­hends venting ducts per se which can be installed quickly and easily in a submerged pouring tube; the said ducts are dispensible one-use items, therefore.
  • the present invention also provides a dispensible venting duct for fitting to the dis­charge end of a submerged pouring tube, the duct comprising a generally U-shaped pipe having at least one inlet port and an outlet port in the respective two limbs of the U-shaped pipe, and anchoring means are fitted to one limb for resiliently engaging the inside of a submerged pouring tube to mount the duct therein.
  • this invention concerns submerged pouring of molten metal from one vessel to another.
  • the flowing metal is conveyed down a conduit or sub­merged pouring tube, from the supply to the receiving vessel and the pouring tube has its bottom, outlet end dipped beneath the surface of metal within the receiving vessel.
  • the incoming metal is therefore delivered at a sub-surface location and is kept from contact with the surrounding air as it flows between the two vessels.
  • the supply vessel is a ladle and the receiving vessel is a tundish but, as indicated hereinbefore, the invention is not limited to sub­merged pouring between these particular kinds of vessels.
  • Fig. 1 schematically illustrates a typical ladle/tundish arrangement.
  • the charging vessel or ladle 10 has a bottom pour opening 11, and in this instance teeming of metal from the ladle 10 will be controlled by a sliding gate valve indicated gen­erally at 12.
  • the valve shown in Fig. 1 is a conven­tional two-plate valve, but it could be a three-plate valve or a shove-through valve. Such valves are known in the art and thus need not be described in detail herein.
  • teeming can be controlled by a stopper rod system such as is known in the art.
  • the valve 12 has a collector nozzle 14 depending from its downstream or sliding plate 15 and a sub­merged pouring tube 16 is secured to the lower end of the collector nozzle 14. Although as drawn the valve 12 is in its open or teeming position, initially it will be closed with the orifices in its plates out of registry, i.e. the plate 14 will be in a dis­placed position relative to that drawn.
  • the ladle 10 is positioned above a tundish 18 with the lower or discharge end 20 of the submerged pouring tube 16 submerged in the molten metal M in the tundish.
  • the air can burst through the joint 21 between the collector nozzle 14 and the submerged pouring tube 16.
  • Molten metal may be entrained in the air and if escapes therewith could represent a hazard to personnel or to the equipment including the valve 12.
  • the present invention provides a venting duct 25 for the submerged pouring tube 16.
  • the venting duct 25 is located in the lower end part of the submerged pouring tube 16.
  • the duct 25 protrudes from the lower or discharge end 20 of the pouring tube 16 and has first and second parts 26 and 27.
  • First limb or part 26 of the duct 25 is located inside the pouring tube 16.
  • the second limb or part 27 extends upwardly alongside the pouring tube.
  • the second part 27 of the duct extends far enough to ensure that its free end 30 will be well clear of the surface of metal M in the tundish 20 when the ladle is in its operative position.
  • the venting duct 25 is generally U-shaped.
  • the second part 27 of the duct has a terminal portion turned downwardly towards the surface of melt in the tundish 18.
  • the terminal portion 31 has a semi­circular form but this form is not essential to the practice of this invention. The reason that the ter­minal portion 31 is down-turned is to deliver any molten metal that may enter the duct 25 safely into the metal M in the tundish 18.
  • the venting duct 25 has a generally S-shaped outline.
  • the duct 25 is made of seamless metal tubing, e.g. of stainless steel.
  • a protective refractory coating or sheath 33 portions of the venting duct 25 which will come into contact with the metal in the tundish 18 are provided with a protective refractory coating or sheath 33.
  • the coating 33 com­pletely encases the second part 27 of the duct but extends only part way along the first part 26.
  • the coating 33 could, however, encase the whole of the duct.
  • the duct 25 could be made entirely of refractory tubing.
  • the duct 25 is so designed that when teeming is initiated, the initial flow of metal does not immediately enter the first part 26 of the duct.
  • the top end of the first part 26 is closed by a refractory plug 35. Air can, however, enter the first part of the duct 25 thanks to ports 36 provided in its wall.
  • These ports can comprise slots, or more conveniently circular apertures, in the side wall of the uncoated portion 26′ of the first part 26 of the duct. There may be e.g. three ports on each of e.g. two or three levels or locations along the uncoated portion 26′.
  • the duct 25 is secured to the end of the sub­merged pouring tube 16 by means of anchors 40 which engage the inside of the tube 16 and a strap 42 which encompasses the tube 16 and the second part 27 of the duct 25.
  • the strap is, however, optional.
  • a plurality of anchors 40 are fastened to the uncoated portion 26′ of the first part 26 of the duct.
  • Each anchor is resilient and has a plurality of legs 43 which are sprung outwardly but are dis­placeable inwardly when they are forced into the pouring tube 16 upon installing the duct 25.
  • the legs 43 of the anchors 40 serve to centralise the first part 26 of the venting duct 25 in the pour­ing tube 16.
  • Each anchor 40 can have any convenient number of legs 43, four being shown in the illustrated embodiment. As will be noted from Figs. 1, 2, 4 and 5, the legs 43 point downwardly and, due to their outward bias, they will jam more tightly against the inner wall of the pouring tube 16 if the duct 25 were displaced downwardly, e.g. by molten metal impacting thereon. If desired, the pouring tube could have ledges in its inner wall against which the ends of the legs 43 could abut for positively locating the duct 25.
  • each anchor 40 serves to deflect the initial onrushing melt away from the ports 36.
  • each anchor has a downwardly-flaring conical skirt portion 45 from which the legs 43 extend.
  • the anchors are so located relative to the ports 36 that the skirt portions enshroud the ports.
  • the anchors there­fore serve the dual functions of locating the duct as well as protecting it from immediately filling with molten metal via the ports 26, which are thus kept open for exhausting air from the inside of the pouring tube 18.
  • the duct 25 exits the pouring tube 18 via its submerged end 20.
  • a beneficial con­sequence of this is that during the teem, there is no way air can be aspirated into the stream of teeming melt through the duct.
  • Equipment embodying this invention can be ad­aptd so as to perform a second function, namely that of disrupting or dispersing a well-filler skull such as may sometimes form and obstruct the bottom opening 11 of the ladle 10.
  • the present equipment can, therefore, incorporate apparatus the subject of our British Patent Application No. 8811937 filed 20th May, 1988, the contents of which earlier appli­cation are incorporated herein by this reference.
  • the venting duct 25′ includes a barrel and a tubular projectile 51 constructed and func­tional as disclosed in the aforementioned application.
  • the duct 25′ also includes an inner, heat-resistant air hose H connectible to a supply of pressurised gas, for firing the projectile at a well-filler skull.
  • the barrel 50 is appropriately centred within the duct 25′ which has a sealing cap C at its end past which the projectile can force its way.
  • the projectile 51 when fired could pierce the cap C or dislodge it from the duct 25′.
  • Means 52 by which the barrel 50 is located at its top end in the duct 25′ will be constructed so as to effectively block entry of melt into the space within the duct 25′ surrounding the barrel 50.
  • Figs. 4 and 5 Another optional feature of the invention is disclosed in Figs. 4 and 5 wherein it will be seen that the duct 25 is in two separable parts connectible together by way of a twist-lock connector 54.
  • One portion A has the anchors 40′ fitted thereto and the other portion B is the refractory-clad part which projects out of the lower end of the pouring tube 16.
  • the bore size of the venting duct 25, 25′ should be sufficient to enable the air in the pouring tube 16 to be exhausted quickly enough to cope with the rate at which molten metal may enter the pouring tube at the onset of teeming.
  • this steel flow rate may be of the order of 3.7 x 10 ⁇ 2 cu.m/h (1.3 cubic feet per second).
  • the venting duct 25, 25′ could have a bore of 2.54 cm (1 inch) where the pour­ing tube has a diameter of some 100 mm and a length of 1 metre to 1.5 metres.
  • This venting duct can have three sets of ports, three in each set, with each bore being of 12.7 mm (0.5 inch) diameter.
  • the venting duct 25, 25′ may have a 19 mm (3/4 inch) bore with ports 9.5 mm (3/8 inch) in diameter.
  • the venting duct could have different forms.
  • the air admittance ports 36 in the wall could be omitted.
  • the end of part 26 of duct 25 shown as closed by plug 35 could be open for ex­hausting air from the submerged pouring tube if the end were fitted with a protective cover or cowl to prevent the initial onrush of molten metal from entering the duct.
  • a cover or cowl could be avoided if the end portion of duct part 26 were downturned such that its open end faces away from the onrushing molten metal.
  • the anchors 40, 40′ are shown central­ising the venting duct in the pouring tube 16, the duct and tube need not be coaxial and in some cases it may be preferred to have duct part 26 off-centre within the pouring tube.
  • the invention is applicable to the pouring of molten metals from one vessel to another, where the metals are to be poured into the receiving vessel via a duct submerged in molten metal in the latter vessel, to keep the flowing metal out of contact with the air.
  • the vessels can include ladles, tundishes, degassing vessels and moulds.
  • the invention is primarily, but not exclusively, intended for use in the iron and steel industry, and has particular application in continuous caster operations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP89306123A 1988-06-24 1989-06-16 Tauchgiessen Withdrawn EP0348110A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8815140 1988-06-24
GB888815140A GB8815140D0 (en) 1988-06-24 1988-06-24 Submerged pouring

Publications (1)

Publication Number Publication Date
EP0348110A1 true EP0348110A1 (de) 1989-12-27

Family

ID=10639341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89306123A Withdrawn EP0348110A1 (de) 1988-06-24 1989-06-16 Tauchgiessen

Country Status (4)

Country Link
EP (1) EP0348110A1 (de)
AU (1) AU3841189A (de)
GB (2) GB8815140D0 (de)
WO (1) WO1989012520A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB100044A (en) * 1915-02-02 1917-01-08 Grenville Mellen Apparatus for use in Casting Metals.
FR485095A (fr) * 1917-04-14 1917-12-11 Dragomir Palyitch Procédé de remplissage des moules et des corps creux au moyen de matières fondues et appareils pour sa réalisation
GB551372A (en) * 1941-06-12 1943-02-19 John Hugh Vaughan Williams Improvements in the manufacture of iron suitable for making ingot moulds
US4546812A (en) * 1983-09-30 1985-10-15 Tiegel Manufacturing Company Method and apparatus for improving the densities of cast parts
US4708326A (en) * 1986-12-15 1987-11-24 Swiss Aluminium Ltd. Vented pouring cup for molten metal casting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB100044A (en) * 1915-02-02 1917-01-08 Grenville Mellen Apparatus for use in Casting Metals.
FR485095A (fr) * 1917-04-14 1917-12-11 Dragomir Palyitch Procédé de remplissage des moules et des corps creux au moyen de matières fondues et appareils pour sa réalisation
GB551372A (en) * 1941-06-12 1943-02-19 John Hugh Vaughan Williams Improvements in the manufacture of iron suitable for making ingot moulds
US4546812A (en) * 1983-09-30 1985-10-15 Tiegel Manufacturing Company Method and apparatus for improving the densities of cast parts
US4708326A (en) * 1986-12-15 1987-11-24 Swiss Aluminium Ltd. Vented pouring cup for molten metal casting

Also Published As

Publication number Publication date
WO1989012520A1 (en) 1989-12-28
GB9000650D0 (en) 1990-06-13
GB2228697B (en) 1992-02-12
GB2228697A (en) 1990-09-05
GB8815140D0 (en) 1988-08-03
AU3841189A (en) 1990-01-12

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