EP0372946A2 - Schmierung von Stranggiesskokillen - Google Patents

Schmierung von Stranggiesskokillen Download PDF

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Publication number
EP0372946A2
EP0372946A2 EP89312746A EP89312746A EP0372946A2 EP 0372946 A2 EP0372946 A2 EP 0372946A2 EP 89312746 A EP89312746 A EP 89312746A EP 89312746 A EP89312746 A EP 89312746A EP 0372946 A2 EP0372946 A2 EP 0372946A2
Authority
EP
European Patent Office
Prior art keywords
mould
reservoir
lubricant
oil
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Withdrawn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
EP89312746A
Other languages
English (en)
French (fr)
Other versions
EP0372946A3 (de
Inventor
Friedrich Peter Mueller
Guy Leblanc
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.)
Rio Tinto Alcan International Ltd
Original Assignee
Alcan International Ltd Canada
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 Alcan International Ltd Canada filed Critical Alcan International Ltd Canada
Publication of EP0372946A2 publication Critical patent/EP0372946A2/de
Publication of EP0372946A3 publication Critical patent/EP0372946A3/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Withdrawn legal-status Critical Current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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/07—Lubricating the moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0401—Moulds provided with a feed head

Definitions

  • This invention relates to continuous casting moulds, and more particularly to casting moulds having effective lubrication of the mould surface.
  • Casting moulds are used to shape molten metal and to extract heat from this metal to form a solid casting or ingot. These moulds have two basic characteristics. The first is to extract heat to effect solidification, and the second is to provide a parting agent or lubricant to prevent adherence between the molten metal and the mould. The distribution of the lubricant over the surface of the inner mould wall has a substantial effect on the surface quality of the ingot.
  • an insulating head formed of a heat resistant and insulating material, such as a refractory material, which resists contact with the molten metal to be cast.
  • the insulating head is located at a position contiguous with or adjacent to and extending around the periphery of the top portion of the mould wall.
  • an apparatus for continuously casting molten metal.
  • This includes a mould for effecting solidification of the molten metal into a formed metal product, means adjacent to an inlet portion of the mould for feeding the molten metal into the mould and means for delivering a lubricating agent to a surface of the mould contacting the molten metal to substantially prevent adhesion of any solidified metal on the surface.
  • a liquid reservoir is provided in the apparatus for holding the lubricating agent, this reservoir having an inlet for lubricating agent and a an outlet or outlets for discharging lubricating agent to the mould surface.
  • This reservoir is adapted to provide a body of lubricant covering all of the outlets and a gas cushion is provided above the body of lubricant whereby a uniform lubricant flow is provided in all outlets. This results in a very uniform delivery of lubricant to the mould surface.
  • the gas cushion is provided by the feeding of the lubricant into the reservoir above or at the top thereof.
  • the reservoir has converging, sloping side walls in the bottom portion thereof and a plurality of lubricant conduits extend either upwardly or downwardly between the bottom region of the reservoir and oil transfer passages to the mould surface.
  • the lubricating agent delivery system may be used with a variety of forming systems, including extrusion, sheeting and insulated or hot top moulds. It is of particular value with a casting device having a mould plate having an inner, axially extending wall defining a mould cavity, and an insulating head member formed of a heat insulating material having a first portion extending transversely over at least a part of the mould cavity and a second portion contiguous with the mould upper surface.
  • the lubricant reservoir may be formed as a cavity within a frame member used to support the insulating head.
  • the lubricating agent may be transferred from the reservoir to the mould cavity by way of lateral bores within the mould plate or by way of an oil plate mounted between the mould upper surface and the insulating head member.
  • An annular groove is preferably provided in the mould upper surface adjacent the edge of the oil plate remote from the mould cavity and this annular groove is adapted to transfer lubricant from the lubricant passage­ways to laterally extending grooves in the bottom face of the oil plate or in the top of the mould plate.
  • the oil transfer grooves may be replaced by a porous oil plate. Again with the porous plate, some form of barrier must be provided between the top of the porous plate and the insulating head to prevent migration of oil. This barrier must be impervious to oil, and may, for instance, be in the form of a tape or thin plate.
  • the invention also relates to a process for producing metal ingot by a continuous casting process.
  • Such process typically comprises the steps of:
  • the improvement according to this invention comprises a method of delivering lubricating oil to the mould surface in an exceptionally uniform manner. This is achieved by feeding the oil from a reservoir having a gas cushion above the body of oil in the reservoir; the gas cushion serving to maintain a constant pressure on the oil.
  • the improved lubricant delivery system of this invention is used with a direct chill casting process comprising the steps of:
  • the mould assembly has an open-ended rectangular body configuration.
  • the mould plate 10 has a short vertical mould face 11, a top face 12 and a bottom face 13.
  • This plate is conveniently manufactured from aluminum and includes a coolant channel 15 in the form of a slot or series of laterally spaced bores each with plug 44 at the outer end and with a plurality of laterally spaced dispersal channels 16 communicating between coolant channel or channels 15 and the bottom of the mould plate 10.
  • the coolant channel or channels 15 are flow connected by way of a plurality of holes 17 to a coolant manifold 18 mounted on the bottom face 13 of mould plate 10.
  • the coolant manifold 18 is manufactured with heavy side walls 19 and a bottom wall 20.
  • the heavy side walls 19 of the coolant manifold serve a significant structural purpose in that they provide rigidity to the mould plate 10.
  • the coolant manifold 18 is mounted to the bottom of the mould plate 10 by means of studs or bolts 23 which also extend through frame members 27. The faces between the manifold and mould plate are sealed by O-rings.
  • This regulating plate serves to direct the flow of coolant upwardly through holes 17 in a uniform manner.
  • the coolant then flows along the channel or channels 15 extending parallel to the top face 12 of the mould plate 10.
  • a series of laterally spaced bores are used for the channels, e.g. bores having a diameter of about 4 mm and spaced from each other by a distance of about 6 mm.
  • the inlet portion of the mould assembly includes an insulating head 33 which generally conforms to the shape of the mould with which it is associated.
  • This insulating head is formed of a heat resistant and insulating material, such a refractory material, which will not deteriorate when in contact with the molten metal to be cast.
  • This head 33 is located at a position continguous with or adjacent to and extending around the periphery of the top portion of the mould wall face 11.
  • the use of such insulating head provides for relatively constant withdrawal of heat from the molten metal during the casting operation when using a short mould wall.
  • the insulating material 33 is held in place by frame members 27 and top plates 35. These may be made from aluminum and are preferably compressed against the mould plate 10 by means of stud 23.
  • Each frame member 27 includes recesses 28 which hold O-rings to provide a seal against the top face of the mould plate.
  • molten aluminum 37 is fed into the insulating head 33 and is chilled while passing moulding plate wall face 11 sufficiently to form an outer skin. This is further cooled by a water spray from coolant dispersal passages 16 to form an ingot 36.
  • the water spray is directed by means of baffle 38 operated by an actuator mechanism 39.
  • the baffle is pivotally mounted and is spring biased by spring mechanism 43 in a direction to move away from the ingot 36.
  • the oil delivery system of the invention is illustrated in Figures 3-5 and is intended to provide a uniform distri­bution of oil on the mould face under all moulding conditions.
  • an oil plate 31 is sandwiched between frame member 27 and insulating member 33 on the one side and the mould plate 10 on the other side. This oil plate 31 flow connects at the inner edge thereof by way of oil channels 29 to an oil reservoir or cavity 30 formed within the frame member 27. Oil is supplied to the reservoir 30 under pressure through the oil inlet connector 32, preferably through a valve assembly connected to the inlet connector.
  • the reservoir 30 preferably has inwardly and downwardly tapering side walls 45 and 46 in a bottom region.
  • the bottom end 47 of reservoir 30 contains a plurality of outlet openings connected to a plurality of downwardly sloping lubricant passageways 29.
  • An annular groove 50 is preferably provided in the top face of mould 11 adjacent the edge of the oil plate 31 which is remote from the mould surface 11. This permits oil to accumulate from the passageways 29 and to be transferred into and through the grooves (of known type) formed in the bottom face of the oil plate 31.
  • grooves 48 are formed on the top face 12 of mould plate 10 and the oil plate 31 is formed without grooves. With this arrangement, the plate simply serves as a barrier between the grooves and the insulation.
  • FIG. 5 An alternative arrangement for oil delivery to the mould face is shown in Figure 5. It includes an oil reservoir 30 with outlet oil channels 29.
  • the oil channels 29 are connected via an annular groove 62 to lateral oil bores 60.
  • These oil bores 60 have a diameter of about 2 mm at a lateral spacing of about 25 mm.
  • One end of each bore 60 is closed by a closure plug 61 while the other end connects to an outlet passage 63 having a diameter of about 0.9 mm. This directs oil at spaced locations into the corner between mould face 11 and the bottom of insulating head 33.
  • Figures 6 and 7 show standard casting moulds incorpo­rating the present invention. These moulds each include a top portion 65, an edge portion 66 with a mould face 11 and a bottom portion 67, with a bottom coolant outlet 16.
  • a lubricant reservoir 30 is incorporated in the mould wall with a lubricant outlet channel 29 extending in an upward direction between a bottom region of reservoir 30 and mould face 11.
  • Figure 7 shows a separate plate 68 mounted on the top portion 65 of the mould with the reservoir 30 formed within plate 68.
  • the lubricant outlet channel 29 extends downwardly from a bottom region of reservoir 30 to the interface of the top edge of mould face 11 and plate 68.
  • lubricant is fed under pressure into reservoir 30 through inlet connector 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
EP19890312746 1988-12-08 1989-12-07 Schmierung von Stranggiesskokillen Withdrawn EP0372946A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA585388 1988-12-08
CA585388 1988-12-08

Publications (2)

Publication Number Publication Date
EP0372946A2 true EP0372946A2 (de) 1990-06-13
EP0372946A3 EP0372946A3 (de) 1991-02-06

Family

ID=4139254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890312746 Withdrawn EP0372946A3 (de) 1988-12-08 1989-12-07 Schmierung von Stranggiesskokillen

Country Status (6)

Country Link
EP (1) EP0372946A3 (de)
JP (1) JPH02247046A (de)
AU (1) AU620180B2 (de)
BR (1) BR8906350A (de)
NO (1) NO894914L (de)
NZ (1) NZ231671A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991010523A1 (en) * 1990-01-17 1991-07-25 Alcan International Limited Lubrication system for casting moulds
EP0560024A3 (en) * 1992-02-06 1993-10-13 Vaw Aluminium Ag Method for continuous casting of metals
WO1994000258A1 (en) * 1992-06-25 1994-01-06 Alcan International Limited Grease lubrication system for metal casting moulds
FR2698298A1 (fr) * 1992-11-23 1994-05-27 Pechiney Aluminium Procédé d'injection automatisée de gaz dans une installation multicoulée de métaux équipée de lingotières à rehausse.
US5320159A (en) * 1992-04-15 1994-06-14 Vaw Aluminum Ag Continuous casting apparatus having gas and mold release agent supply and distribution plate
EP0941786A1 (de) * 1998-03-13 1999-09-15 Honda Giken Kogyo Kabushiki Kaisha Verfahren und Vorrichtung zur Schmierung beim kontinuierlichen Giessen von Leichtmetallen
DE102017127048A1 (de) * 2017-11-16 2019-05-16 Hpi High Performance Industrietechnik Gmbh Kokille zum Stranggießen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424457A1 (de) * 1984-07-03 1986-01-16 Kaiser Aluminium Europe Inc., 4000 Düsseldorf Vorrichtung zum stranggiessen von metallen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991010523A1 (en) * 1990-01-17 1991-07-25 Alcan International Limited Lubrication system for casting moulds
EP0560024A3 (en) * 1992-02-06 1993-10-13 Vaw Aluminium Ag Method for continuous casting of metals
US5343933A (en) * 1992-02-06 1994-09-06 Vaw Aluminium Ag Process and apparatus for continuously casting metals
US5320159A (en) * 1992-04-15 1994-06-14 Vaw Aluminum Ag Continuous casting apparatus having gas and mold release agent supply and distribution plate
WO1994000258A1 (en) * 1992-06-25 1994-01-06 Alcan International Limited Grease lubrication system for metal casting moulds
FR2698298A1 (fr) * 1992-11-23 1994-05-27 Pechiney Aluminium Procédé d'injection automatisée de gaz dans une installation multicoulée de métaux équipée de lingotières à rehausse.
EP0599750A1 (de) * 1992-11-23 1994-06-01 Aluminium Pechiney Verfahren zum automatischen Einblasen von Gas in den Kokillen-Aufsatz einer Multistranggiessanlage
US5431213A (en) * 1992-11-23 1995-07-11 Aluminium Pechiney Method for automated injection of gas into an installation for multiple strand casting of metals using the hot top process
EP0941786A1 (de) * 1998-03-13 1999-09-15 Honda Giken Kogyo Kabushiki Kaisha Verfahren und Vorrichtung zur Schmierung beim kontinuierlichen Giessen von Leichtmetallen
US6840303B1 (en) 1998-03-13 2005-01-11 Honda Giken Kogyo Kabushiki Kaisha Process for continuously casting light alloy and apparatus for continuously casting light alloy
DE102017127048A1 (de) * 2017-11-16 2019-05-16 Hpi High Performance Industrietechnik Gmbh Kokille zum Stranggießen
DE102017127048B4 (de) * 2017-11-16 2021-06-10 Hpi High Performance Industrietechnik Gmbh Kokille zum Stranggießen

Also Published As

Publication number Publication date
AU620180B2 (en) 1992-02-13
NZ231671A (en) 1991-08-27
JPH02247046A (ja) 1990-10-02
BR8906350A (pt) 1990-08-21
AU4594789A (en) 1990-06-21
NO894914L (no) 1990-06-11
EP0372946A3 (de) 1991-02-06
NO894914D0 (no) 1989-12-07

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