EP0081117A1 - Appareil pour le refroidissement d'un substrat en mouvement qui sert au refroidissement rapide - Google Patents

Appareil pour le refroidissement d'un substrat en mouvement qui sert au refroidissement rapide Download PDF

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Publication number
EP0081117A1
EP0081117A1 EP82110656A EP82110656A EP0081117A1 EP 0081117 A1 EP0081117 A1 EP 0081117A1 EP 82110656 A EP82110656 A EP 82110656A EP 82110656 A EP82110656 A EP 82110656A EP 0081117 A1 EP0081117 A1 EP 0081117A1
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EP
European Patent Office
Prior art keywords
coolant
converse
casting
cooling
spraying
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
EP82110656A
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German (de)
English (en)
Inventor
John Robert Bedell
Paul Garson Friedmann
Julian Howard Kushnick
Eli Rosenthal
James Russell Hubbard
Christian John Zingler
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.)
Allied Corp
Original Assignee
Allied Corp
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 Allied Corp filed Critical Allied Corp
Publication of EP0081117A1 publication Critical patent/EP0081117A1/fr
Ceased legal-status Critical Current

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    • 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
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • B22D11/0685—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting belts

Definitions

  • This invention relates to cooling of moving chill surfaces used in continuous casting processes. More particularly, the invention relates to such cooling in which a first surface of a substrate receives molten solidifying material for rapid quenching and a coolant is sprayed onto a second surface of the substrate and prevented from contacting the first mentioned surface.
  • the casting apparatus which may be used for casting metal filaments, such as strips, sheets, ribbons or even round or square wire of amorphous metal alloys, includes either a moving chill belt or an annular chill roll as the moving chill body or substrate.
  • the moving chill substrate may be cooled on the surface opposite to the surface upon which the molten material is received.
  • a melt is deposited on the outer surface of the main cooling ring 5, and pressurized water is discharged through a number of nozzles 38-1 against the inner surface of the ring for cooling the ring.
  • Hazelett recognizes the need to avoid contact between the metal and cooling water, the only precaution taken is'the provision of a chamfer in a roll in which the cooling ring travels, as well as the provision of a surfacing ring which is wider than the roll thereby to permit water runoff without contact with the molten metal.
  • Such an approach does not provide an efficient means for positive prevention of water coolant from reaching the outer surface of the ring.
  • the detrimental effects of a contact between the coolant and the metal may be experienced in the Hazelett structure due to seepage of the coolant towards the outer ring surface.
  • U.S. Patent 3,976,117 to Olsson shows, at Figure 14 thereof, a sprayer for a coolant directed at the underside of a travelling belt used in a casting apparatus.
  • the upper surface of the belt provides the chill surface for the solidifying molten metal. No provision is made, however, for assuring that none of the coolant seeps to the upper surface, where it may adversely affect the strand of metal being cast.
  • the only disclosure of removal of a liquid from the belt is related to removal of a cleaning liquid, where a rubber squeegee 134 is used to remove the cleaning liquid from from the same surface of the belt which receives the solidifying metal.
  • the prior art thus fails to provide adequate measures for assuring that moisture or other contaminants found in the coolant do not travel to and contact the chill surface of a moving substrate. Such failure may lead to contaminated, poor quality cast ribbon or filament.
  • An additional object of the invention is the use of a vacuum, applied to the underside of a moving chill substrate in a continuous casting process, to retain coolant sprayed against the underside substantially within a cooling apparatus for the substrate.
  • Application of the vacuum in the vicinity of spraying nozzles and coolant scraping blades prevents migration of either the sprayed coolant or the coolant removed by the scraping blades to the other surface of the substrate.
  • the present invention provides a cooling means for a moving chill member of a continuous casting apparatus for molten solidifying material.
  • the chill member is more specifically a substrate with a pair of opposed surfaces, such as a moving belt, for example.
  • the cooling means includes a pressurizing means for effecting a pressure gradient across the two surfaces of the substrate forming the chill member.
  • Spraying means is provided for spraying a coolant against that surface of the substrate which is exposed to the lower pressure, thus preventing flow of the coolant from that surface to the other surface of the substrate.
  • the invention more specifically provides a cooling means for a moving chill member of a continuous casting apparatus, including a plurality of nozzles for spraying the coolant against one surface of the substrate.
  • Scraping means is provided for removing residual coolant from the sprayed surface, and a substantially sealed enclosure provided for the nozzles and scraping means.
  • An evacuating means is provided for evacuating the enclosure, thereby to provide a pressure gradient acting on the coolant to prevent its migration from the sprayed surface to the other surface of the substrate.
  • the enclosure is preferably sealed against the sprayed surface of the substrate by elongated seals formed of polytetrafluoroethylene, and the scraping means is preferably formed of a plurality of sheets of stainless steel, contacting the sprayed surface of the substrate and oriented against the direction of travel thereof.
  • the coolant used is preferably water at a temperature above the dew point for the ambient conditions, and the pressure gradient provided for the two surfaces of the substrate is in the.approximate range of 1.5 to 4 cm Hg.
  • Figure'l shows an elevational or side view of a continuous belt casting apparatus incorporating a cooling apparatus in accordance with the present invention
  • the present invention may be utilized in any filament casting operation in which a puddle of molten, solidifying material is ejected from a nozzle of a container therefor onto a moving chill member.
  • the invention is particularly applicable to casting apparatus for amorphous metal alloys, however, in which the puddle must be very rapidly quenched on a rapidly moving carrier.
  • a continuous casting apparatus for such amorphous alloys is shown as containing a crucible 10 for the molten alloy.
  • a nozzle 12 discharges the above-mentioned puddle of alloy for solidification on a moving chill substrate or member.
  • a moving belt 14 forms the substrate and receives the molten alloy 16, discharged from crucible 10 by nozzle 12.
  • a cooling apparatus 18 is shown in contact with the belt 14. It should be understood that a rapidly rotating chill wheel may be provided, instead of the illustrative belt 14, and that the principles of the present invention are equally applicable thereto.
  • the cooling apparatus 18 cools the underside of belt 14 which, in turn, chills and solidifies the molten alloy 16 carried on the upper surface of the belt. This arrangement is dictated, inter alia, by considerations of the quality of the filament resulting from the casting operation. The presence of any contaminants on the upper surface of the belt, hereinafter referred to as the casting surface thereof, leads to significant reductions in filament quality, particularly where thin film filaments are produced.
  • the prior art provides for cooling the belt by spraying a coolant, such as water for example, against the surface of the chill member opposite to the casting surface, hereinafter referenced as the converse surface thereof.
  • a coolant such as water for example
  • the present invention advantageously provides positive means for eliminating any migration of contaminants, particularly of coolant material, from the converse surface to the casting surface of the chill member, thereby improving the quality of the filament produced.
  • belt 14 is seen to form an endless loop around a pair of rollers 20 and 22.
  • One of the rollers may be driven by a driving means, such as an electric motor (not shown).
  • Cooling apparatus 18 is supported on a pair of stands 24, 26.
  • this apparatus is used to cool the belt which thus acts as the chill member for quenching the molten amorphous alloy.
  • the alloy solidifies in response to the cooling effect, to form a glassy metal filament 30 ( Figures 1 and 2).
  • the filament is wound on a takeup reel 32 suitably driven to accept and wind the filament at an appropriate high rate determined by the speed of belt 14.
  • the coolant used to cool the belt 14 is water, though other fluids are similarly useful.
  • the water is supplied to cooling apparatus 18 by a tubing 34 and coupling 36 (see Figure 1).
  • the used coolant, having been heated by the belt, is collected in a sump 38 for disposal.
  • FIG. 3A and 3B the cooling apparatus of the invention is illustrated in more detail including a box-like enclosure 40 forming a cooling chamber within which is provided a plurality of nozzles 42 for spraying the coolant against the converse surface of belt 14.
  • a - manifold 66 shown in Figures 3A-3B, 4A-4B and 5, supplying the pressurized coolant to nozzles 42.
  • the belt In order to achieve nucleate boiling in the cooling chamber, the belt should be at a temperature above the boiling point of the coolant. It is also desirable to permit the coolant, which is directly sprayed thereagainst, to fall freely from the surface against which it is impinged. Inasmuch as the belt temperature is over 100°C, at the cooling station-above the boiling point of the water coolant, and all the requirements are met by the structure of Figures 3A-3B, the advantageous nucleate boiling of the coolant against the belt occurs as the belt progresses through the succession of high pressure sprays from the nozzles 42.
  • belt 14 is- laterally guided by a pair of idler rollers 46 at the entrance to the cooling chamber.
  • An inlet seal and bottom wiper 48 is provided to maintain the vacuum produced within the enclosure. This prevents the entry of boundary layer air from the belt 14 at the upstream end.
  • Adjustably disposed carrier and sealing-plates 50 and 52 are provided at either side of belt 14, and thus form the top (except for belt 14) of the enclosure 40 throughout the length of the cooling apparatus.
  • the plates 50, 52 are laterally adjustable by a plurality of adjusting bolts 54 passing through transverse adjustment notches 56 in the plates (see Figures 4A, 4B and 5).
  • the bolts 54 are mounted on a pair of premanently secured collar plates 58 and 60 of enclosure 40. Adjusting bolts 54 specifically are held by nuts 62 below collar plates 58, 60.
  • the converse surface (bottom) of the belt is supported by elongated seals 68.
  • the seals also acting as guides, are preferably mounted in grooves in adjustable guide plates 50 and 52.
  • An appropriate material of which the seals may be formed is polytetrafluoroethylene (Teflon).
  • Teflon polytetrafluoroethylene
  • the seals 68 possess a low coefficient of friction, thus permitting the belt to slide easily thereover, and effectively seal the top of enclosure 40.
  • the top surface of the guides 68 are crowned to provide substantially line contact, thus increasing the pressure along the line for more efficient sealing action.
  • pressurized coolant is- supplied by manifold 66 through nozzles 42 spraying against the converse surface of belt 14.
  • the coolant undergoes nucleate boiling against the converse surface, and resulting vapor and droplets of coolant are formed, thus efficiently cooling the belt 14.
  • a pressure gradient sweeps coolant material back into the enclosure at any imperfections of the seals or at any point where the belt might vibrate momentarily lifting the edges from the seals 68.
  • the concept provides not only a tightened seal for enclosure of the cooling apparatus, but a positive, sweeping action keeping the coolant isolated inside the cooling chamber.
  • the falling droplets and condensed vapor are collected in enclosure 40 and flow to the sump 38, for appropriate collection and recirculation (see Figure 3B).
  • belt 14 is shown in greater detail and in cross section and includes a body or substrate 70, preferably of a copper alloy, with casting and converse surfaces 72 and 74.
  • Vacuum port structure 44 is connected to a source of negative pressure by a tubing 76, and forms an entry port 78 and connecting passageway 80.
  • Application of a vacuum to passageway 78 causes evacuation of vapor from upper region 82 of the enclosure 40 adjacent the converse surface 74 of substrate 70.
  • atmospheric pressure induces passage of ambient air through imperfections in elongated seals 68 to enter the region, as shown by the arrows in the two Figures.
  • the vapor shown in Fig. 6 is formed partially by nucleate boiling of the coolant sprayed by nozzle 42 against converse surface 74 of the substrate.
  • a relatively low volume of coolant is used, but the coolant is sprayed at high pressures, perferably 40-80 lbs/in 2 (275-550 KPa), and thus at high velocity. This assures the maximum penetration of the fresh liquid through the liquid film against the converse side 74 of the belt.
  • the latent heat of vaporization is utilized assuring optimization of the heat transfer process.
  • the vacuum provided by the port structures 44 advantageously holds the belt 14 down in position against the impact of the coolant spray.
  • relative small sized orifice nozzles are used to provide the increased spray jet velocity while maintaining the substantially constant rate of coolant flow.
  • a possible explanation of the increased heat transfer observed with increased nozzle spray velocity is the increased scrubbing action provided by the spray at the belt surface. Specifically, any vapor or steam produced during the cooling process is scrubbed away more efficiently by the higher velocity spray. Thus, any such film of steam or vapor, which interferes with heat transfer efficiency, is scrubbed from the belt and provides increased efficiency of operation.
  • the sprayed coolant is above the dew point temperature at the time of spraying against surface 74.
  • the coolant is preferably heated to a temperature of approximately 75°C, in order to assure that no condensation occurs on casting surface 72, thus further avoiding the addition of any contaminant to the casting surface.
  • multiple scrapers 84 are provided adjacent terminal vacuum chamber 86, for removing any residual coolant from the converse surface 74 prior to exiting of belt 14 from contact with the cooling apparatus.
  • This mechanical removal of excess coolant and vapor film assisted by the vacuum in chamber 86 assures that coolant does not, through contact with rollers 20, 22 and the like, ultimately migrate to the casting surface 72 and detrimentally affect the quality of the produced filament.
  • Without the scrapers 84 a liquid film tends to be trapped.on the belt surface and the coolant layer sprayed thereon during the' next pass in the cooling apparatus must penetrate this film. Such a trapped film thus reduces the effective heat transfer rate of the cooling apparatus by reducing the efficiency of nucleate boiling.
  • scrapers 84 are fastened by means of fasteners 88 to a perforate plate 90.
  • .Scrapers 84 are preferably oriented oppositely to the direction of travel of belt 14, to provide a more -aggressive removal of the remanent coolant and film.
  • the angle formed between scrapers 84 and belt 14 may be fairly sharp, to assure removal of a maximal amount of remanent coolant. A preferred angle is approximately 20°.
  • chamber 86 includes a-supporting wall 92 for perforate plate 90 and an inclined bottom surface 94. Any coolant removed from the converse surface of belt 14 by scrapers 84 is seen to flow downwardly through perforations 96 onto bottom surface 94 for discharge, through an opening 98 in supporting wall 92, to sump 38.
  • chamber 86 is advantageously kept at a reduced pressure. Accordingly, counterflowing air, urged by the pressure differential between the casting and converse surfaces, forces the coolant back towards chamber 86 rather than towards the casting surface of belt 14.
  • Separate evacuating structures may be provided for chamber 86 to achieve the above-described result.
  • the evacuating port structures 44 providing the reduced pressure of the entire spraying chamber, similarly provided the reduced pressure for chamber 86. -The reduced pressure is communicated to chamber 86 by opening 98 in wall 92.
  • a pressure differential of approximately 2.5 cm. Hg. is desirable between the casting surface and the converse surface of the belt, although other values of the differential are also beneficial. Additionally, while scrapers oriented against the direction of motion of the belt are preferred, at an inclination of 20°, it is appreciated that other orientations are similarly acceptable within the broad concepts of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP82110656A 1981-12-04 1982-11-18 Appareil pour le refroidissement d'un substrat en mouvement qui sert au refroidissement rapide Ceased EP0081117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32767581A 1981-12-04 1981-12-04
US327675 1981-12-04

Publications (1)

Publication Number Publication Date
EP0081117A1 true EP0081117A1 (fr) 1983-06-15

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EP82110656A Ceased EP0081117A1 (fr) 1981-12-04 1982-11-18 Appareil pour le refroidissement d'un substrat en mouvement qui sert au refroidissement rapide

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EP (1) EP0081117A1 (fr)
JP (1) JPS6051935B2 (fr)
CA (1) CA1192017A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721152A (en) * 1984-06-28 1988-01-26 Mannesmann Ag Apparatus for continuous casting
WO1999026744A1 (fr) * 1997-11-20 1999-06-03 Kaiser Aluminum & Chemical Corporation Dispositif et procede de refroidissement de tapis roulants
CN110076308A (zh) * 2019-05-30 2019-08-02 燕山大学 一种非晶合金连铸机及其连续铸造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487376A (en) * 2011-01-19 2012-07-25 Edwards Ltd Two material pump stator for corrosion resistance and thermal conductivity

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976117A (en) * 1974-11-01 1976-08-24 Erik Allan Olsson Method of and apparatus for converting molten metal into a semi-finished or finished product
DE2709540A1 (de) * 1977-03-04 1978-09-07 Larex Ag Rech Verfahren zum kuehlen und fuehren eines umlaufenden kokillenbandes an einer vorrichtung zum kontinuierlichen giessen von straengen
DE2729431A1 (de) * 1977-03-04 1979-01-11 Larex Ag Rech Verfahren und vorrichtung zum kuehlen und fuehren eines umlaufenden kokillenbandes in einer anlage zum kontinuierlichen giessen von straengen
DE2729425A1 (de) * 1977-03-04 1979-01-11 Larex Ag Rech Vorrichtung zum kuehlen und fuehren eines umlaufenden kokillenbandes in einer anlage zum kontinuierlichen giessen von straengen
GB2065520A (en) * 1979-12-19 1981-07-01 Properzi G Cooling device in a continuous casting machine of the wheel-and-belt type

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976117A (en) * 1974-11-01 1976-08-24 Erik Allan Olsson Method of and apparatus for converting molten metal into a semi-finished or finished product
DE2709540A1 (de) * 1977-03-04 1978-09-07 Larex Ag Rech Verfahren zum kuehlen und fuehren eines umlaufenden kokillenbandes an einer vorrichtung zum kontinuierlichen giessen von straengen
DE2729431A1 (de) * 1977-03-04 1979-01-11 Larex Ag Rech Verfahren und vorrichtung zum kuehlen und fuehren eines umlaufenden kokillenbandes in einer anlage zum kontinuierlichen giessen von straengen
DE2729425A1 (de) * 1977-03-04 1979-01-11 Larex Ag Rech Vorrichtung zum kuehlen und fuehren eines umlaufenden kokillenbandes in einer anlage zum kontinuierlichen giessen von straengen
GB2065520A (en) * 1979-12-19 1981-07-01 Properzi G Cooling device in a continuous casting machine of the wheel-and-belt type

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721152A (en) * 1984-06-28 1988-01-26 Mannesmann Ag Apparatus for continuous casting
WO1999026744A1 (fr) * 1997-11-20 1999-06-03 Kaiser Aluminum & Chemical Corporation Dispositif et procede de refroidissement de tapis roulants
CN110076308A (zh) * 2019-05-30 2019-08-02 燕山大学 一种非晶合金连铸机及其连续铸造方法

Also Published As

Publication number Publication date
CA1192017A (fr) 1985-08-20
JPS58151945A (ja) 1983-09-09
JPS6051935B2 (ja) 1985-11-16

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Inventor name: ROSENTHAL, ELI

Inventor name: KUSHNICK, JULIAN HOWARD

Inventor name: HUBBARD, JAMES RUSSELL

Inventor name: BEDELL, JOHN ROBERT

Inventor name: FRIEDMANN, PAUL GARSON

Inventor name: ZINGLER, CHRISTIAN JOHN