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WO1998008637A2 - Agent de separation pour machine de coulee a cylindres - Google Patents

Agent de separation pour machine de coulee a cylindres Download PDF

Info

Publication number
WO1998008637A2
WO1998008637A2 PCT/GB1997/002308 GB9702308W WO9808637A2 WO 1998008637 A2 WO1998008637 A2 WO 1998008637A2 GB 9702308 W GB9702308 W GB 9702308W WO 9808637 A2 WO9808637 A2 WO 9808637A2
Authority
WO
WIPO (PCT)
Prior art keywords
roll
parting agent
casting
rolls
wipers
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/GB1997/002308
Other languages
English (en)
Other versions
WO1998008637A3 (fr
Inventor
Jean-Marie Bouzendorffer
Bruno Di Filippo
Philip Milroy Thomas
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.)
Kvaerner Engineering and Construction UK Ltd
Eurofoil Luxembourg SA
Original Assignee
Davy International Ltd
Eurofoil SA
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 Davy International Ltd, Eurofoil SA filed Critical Davy International Ltd
Priority to AU40260/97A priority Critical patent/AU4026097A/en
Publication of WO1998008637A2 publication Critical patent/WO1998008637A2/fr
Publication of WO1998008637A3 publication Critical patent/WO1998008637A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings

Definitions

  • This invention relates to roll casting, in particular to the casting of metal strip.
  • Twin roll casting is an established technology for the production of metal strip.
  • the thickness of the cast strip In the case of aluminium alloys, it is usual for the thickness of the cast strip to be in the range 6 - 10mm.
  • molten metal is fed into the bite of a pair of internally cooled, counter-rotating rolls. The molten metal solidifies in contact with the casting rolls and then undergoes a hot reduction before exiting the caster as solid strip.
  • a major problem of the aforesaid process is the tendency of the cast strip to adhere to either or both of the casting rolls. It is known that the application of a parting agent, such as a suspension of colloidal graphite in water, to the casting rolls on the exit side of the machine is beneficial in reducing this sticking.
  • the parting agent is usually applied to the casting rolls as an atomised spray.
  • Another feature of roll casting of aluminium strip is the formation of a complex aluminium/oxide coating on the surface of the casting rolls and it is known that the presence of a coherent coating is beneficial in minimising the occurrence of sticking. It is believed that the aluminium/oxide coating provides a substrate that is receptive to the application of the parting agent and that the parting agent is substantially removed with the cast strip. It is known that once the roll coating has developed, the amount of parting agent that has to be applied to control sticking can be reduced.
  • twin roll casting the surface coating is not deformed other than when it passes through the molten metal when any damage to the coating may be repaired.
  • the surface coating and parting layer are subjected to a rolling action in the casting roll/backup roll bite and this can have the effect of damaging the combined surface coating and parting agent layer.
  • the effect of "rolling" this combined layer is to cause the layer to fragment, and this can generate debris. Due to the damage caused to the coating/parting agent layer during this rolling operation a non-uniform roll surface is created. In some areas the roll coating will be compacted whereas in other areas the coating will be removed and a fresh steel surface exposed to the molten metal.
  • This non-uniform coating will result in non-uniform sticking behaviour with sticking being encouraged in regions where the roll coating is removed.
  • this form of sticking will be described as micro or point sticking to differentiate it from the macro or gross sticking that can be encountered in conventional twin roll casting. This cycle is repeated every revolution and leads to a gradual degradation of the roll surface and strip surface quality.
  • the parting agent suspension is made up by adding a known volume of graphite concentrate to water such that there is typically 1 - 2% of graphite in suspension.
  • the particle size of the graphite is typically in the range 1 - 2 microns, there is a tendency for the graphite particles to agglomerate and come out of suspension.
  • graphite particles will be fragmented and it is likely that a proportion of this will become detached from the casting rolls. It is an object of the present invention to provide a method of at least partially overcoming the above-mentioned problems when casting with a four high caster.
  • a parting agent which does not depend on solid particles to provide the required properties.
  • a material could be water soluble oil with lubricating and load bearing properties.
  • An example of a suitable oil is a gelled water glycol mixture containing adhesion promoters.
  • the concentration of oil in the water is in the range 0 - 30% and can be varied depending on the precise casting conditions.
  • the composition of the oil can be varied depending on the precise requirements of material being cast. For example, if high loads are anticipated, the composition of the oil can be adjusted to increase the load bearing characteristics.
  • particles such as graphite may also be included as a component of the parting agent.
  • the parting layer can be applied on either the exit or entry sides of the machine. If it is applied on the exit side, a parting agent which is free from particles must be employed. If it is applied on the entry side it is preferred to employ a parting agent which is free from particles but if desired, a conventional parting agent including particles may be used or a mixture of parting agents having particles and not having particles respectively may be used. If the parting agent is applied on the entry side it is necessary to incorporate full width roll wipers to ensure that the parting agent is completely dry before entering the molten metal contact area.
  • the surface of the roll is wiped to remove surface debris prior to that part of the roll entering the bite between the roll and its back-up roll.
  • the wiping can be achieved in a number of ways.
  • the casting rolls can be wiped or brushed with abrasive materials or the debris can be removed by wiping with a totally non-abrasive medium such as cotton cloth held in a rigid support.
  • the roll caster comprises a pair of steel casting rolls 1,2 rotatably supported in a rigid housing not shown.
  • the casting rolls are arranged one above the other and each roll is backed-up by a backing roll 3,4 respectively.
  • the rolls, particularly the casting rolls, are cooled usually by the flow of water internally thereof.
  • the cooled rolls are rotated and molten metal, usually aluminium or aluminium alloy, is introduced into the bite between the casting rolls on the input side of the machine by means of a nozzle not shown.
  • molten metal usually aluminium or aluminium alloy
  • a parting layer of a material free from particles in water is sprayed onto each casting roll 1,2 by a nozzle 5 positioned on the outgoing side of the machine.
  • the parting layer is conveniently a water soluble oil with lubricating and load bearing properties.
  • the parting layer can be sprayed onto the rolls on the entry side of the machine but in that case it is necessary to incorporate full width roll wipers to ensure that the parting agent is completely dry before entering the molten metal contact area.
  • the spray nozzles 5 are positioned on the entry side of the machine and wipers 7 ensure that the parting agent sprayed from the nozzles 5 is completely dry before it comes into contact with molten metal.
  • wipers are provided on the exit side of the machine to remove debris from the casting rolls before they come into contact with their associated back-up roll.
  • the wipers 8 can take a number of different forms.
  • the casting rolls can be wiped or brushed with abrasive materials or the debris can be removed by wiping with a totally non-abrasive medium such as cotton cloth held in a rigid support.
  • the support can either be fixed or oscillated. If aggressive cleaning is required it is beneficial to incorporate an extraction system to remove any debris.
  • brushing is the preferred method, the brush can be made strongly abrasive by using a wire fill or if less aggressive brushing is required a synthetic fill impregnated with abrasive particles can be used.
  • the brush can be made up of discs of a soft material such as cotton cloth.
  • the brush can be the full width of the casting rolls but the preferred approach is to use a shorter brush that covers the roll face by traversing across the rolls.
  • the parting agent can be applied through a plurality of nozzles attached to the traversing mechanism.
  • the brushes can be loaded onto the roll using either position control or load control modes. In the event of a full width brush being used it is beneficial to oscillate the brush to prevent localised marking of the rolls.
  • An alternative approach to remove loose debris is to use a full width doctor blade.
  • the doctor blade can be used in conjunction with any of the aforementioned roll dressing devices and methods of applying the parting layer.
  • the roll dressing equipment can conveniently be an integral part of the external cooling device.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un agent de séparation destiné à être utilisé dans une machine de coulée à cylindres telle qu'une machine de coulée d'aluminium à cylindres, comprenant une solution d'huile soluble dans l'eau, telle qu'un mélange gélifié d'eau et de glycol.
PCT/GB1997/002308 1996-08-27 1997-08-27 Agent de separation pour machine de coulee a cylindres Ceased WO1998008637A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40260/97A AU4026097A (en) 1996-08-27 1997-08-27 Roll caster parting agent

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9617863.7 1996-08-27
GBGB9617863.7A GB9617863D0 (en) 1996-08-27 1996-08-27 Roll casting

Publications (2)

Publication Number Publication Date
WO1998008637A2 true WO1998008637A2 (fr) 1998-03-05
WO1998008637A3 WO1998008637A3 (fr) 1998-05-07

Family

ID=10798977

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002308 Ceased WO1998008637A2 (fr) 1996-08-27 1997-08-27 Agent de separation pour machine de coulee a cylindres

Country Status (3)

Country Link
AU (1) AU4026097A (fr)
GB (1) GB9617863D0 (fr)
WO (1) WO1998008637A2 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495962A (en) * 1967-06-14 1970-02-17 Exxon Research Engineering Co Method of utilizing graphite-containing oil-in-water lubricants for glass molding
FR2157700B1 (fr) * 1971-10-26 1975-07-18 Shell Berre Raffinage
JPS5711753A (en) * 1980-06-23 1982-01-21 Kawasaki Steel Corp Method and apparatus of manufacturing quenched thin metallic band
JPS58149997A (ja) * 1982-03-01 1983-09-06 Yushiro Do Brazil Ind Chem Ltd 水溶性金属加工油剤
JPS58185690A (ja) * 1982-04-23 1983-10-29 Central Glass Co Ltd 切削研摩用補助剤
US4781848A (en) * 1987-05-21 1988-11-01 Aluminum Company Of America Metalworking lubricant comprising an oil-in-water microemulsion
US5167137A (en) * 1988-01-29 1992-12-01 Southwire Company Method for automatically adjusting soluble oil flow rates to control physical properties of continuously rolled rod
JPH0366451A (ja) * 1989-08-03 1991-03-22 Nippon Steel Corp 薄板連続鋳造機用の振動ブラシ装置
JPH0716770B2 (ja) * 1990-02-02 1995-03-01 新日本製鐵株式会社 薄肉鋳片の連続鋳造装置
JPH06190513A (ja) * 1992-12-25 1994-07-12 Kawasaki Steel Corp 金属薄帯の製造方法
GB9404109D0 (en) * 1994-03-03 1994-04-20 Davy Mckee Poole Lubrication of casting rolls

Also Published As

Publication number Publication date
AU4026097A (en) 1998-03-19
WO1998008637A3 (fr) 1998-05-07
GB9617863D0 (en) 1996-10-09

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