US3425482A - Continuous casting of non-ferrous metals - Google Patents

Continuous casting of non-ferrous metals Download PDF

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Publication number
US3425482A
US3425482A US559290A US3425482DA US3425482A US 3425482 A US3425482 A US 3425482A US 559290 A US559290 A US 559290A US 3425482D A US3425482D A US 3425482DA US 3425482 A US3425482 A US 3425482A
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United States
Prior art keywords
mold
float
strand
casting
continuous casting
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.)
Expired - Lifetime
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US559290A
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English (en)
Inventor
Alfons Capaul
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Alcan Holdings Switzerland AG
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Alusuisse Holdings AG
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Publication date
Priority claimed from CH881965A external-priority patent/CH423108A/de
Application filed by Alusuisse Holdings AG filed Critical Alusuisse Holdings AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/08Accessories for starting the casting procedure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/103Distributing the molten metal, e.g. using runners, floats, distributors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/18Controlling or regulating processes or operations for pouring
    • B22D11/181Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level

Definitions

  • This invention relates to the continuous casting of nonferrous metals, and is particularly applicable to the casting of aluminum and aluminum alloys, utilizing a float or floats to regulate the flow of metal to the mold.
  • a surface layer of the required nature can be produced for example by using a high speed of descent of the strand, or by casting the strand with a low meniscus in the mold, that is to say with a low height of metal in the mold.
  • Continuous casting with a high strand speed can, however, easily result in a rupture of the solidified wall of the strand, particularly in the case of a slab suitable for subsequent rolling.
  • This technique can therefore be applied only in certain circumstances that is to say only in the casting of strands of comparatively small cross-section, or in casting rods or plates.
  • the other technique in which the strand is cast with a low meniscus height does not involve any risk of rupture, even when the product from the mold is an aluminum slab for the subsequent rolling, with a cross-section of 800 x 150 mm. or more.
  • the distance involved here is thus a relative one and can be changed either by changing the level of the nozzle or nozzles or by changing the level of the mold, or by changing both these levels.
  • the meniscus height can be from 60 to mm. above the bottom of the mold and subsequently be reduced to a height of between 25 and 40 mm.
  • the slabs thus produced can be rolled into sheet of anodizing quality, because the surface layer of columnar crystals is thin and uniform and can be removed reliably by milling to a comparatively small depth.
  • a further advantage of the process in accordance with the invention is that the pouring temperature range can be greater than that permissible hitherto, without giving rise to cold-set places or a thicker surface layer of columnar crystals.
  • the pouring temperature range can be increased upwards by about 10 C. and downwards by about 10 C. to 15 C., which corresponds to a doubling of the range.
  • a smoother surface is obtained because there is much less sweating out.
  • the mold and the strand are cooled in such a way that the sump of molten metal in the mold is substantially rectangular as seen from above and the thickness of the solidified crust within the mold is substantially the same along both the long and short sides of the slab.
  • FIGURE 1 is a diagrammatic plan view of the top of the strand in the mold during a continuous casting process, indicating in a solid curved closed solid line the configuration of the metal sump in accordance with the prior art, and in broken lines in accordance with the instant invention;
  • FIGURE 2 is a fragmentary vertical sectional view through part of one example of a continuous casting machine for carrying out the process in accordance with the invention
  • FIGURE 3 is a plan view of the machine shown in FIGURE 2;
  • FIGURE 4 is an elevational view of a float forming part of the machine shown in FIGURES 2 and 3;
  • FIGURE 5 is a plan view of the float shown in FIG- URE 4.
  • FIGURES 6 to 8 are details of the machine shown in FIGURES 2 and 3;
  • FIGURE 9 is a plan view of the mold forming par of the machine shown in FIGURES 2 and 3;
  • FIGURE 10 is a sectional view taken along the line B-B of FIGURE 9;
  • FIGURE 11 is a sectional view taken along the line 0-6 of FIGURE 9;
  • FIGURE 12 is a side elevational view of a device for raising and lowering the height of the meniscus of the molten metal in the mold, the device forming a modification of the machine shown in FIGURES 2 and 3;
  • FIGURE 13 is a plan view of the modified device shown in FIGURE 12;
  • FIGURE 14 is a schematic diagram of a hydraulic mechanism and conduit operating the device shown in FIGURES 12 and 13;
  • FIGURE 15 is a vertical sectional view of a part of a modified machine showing a device for raising and lowering the mold;
  • FIGURE 16 is a plan view of the device shown in FIG- URE 15;
  • FIGURE 17 is a diagram of a hydraulic conduit of the device shown in FIGURES 15 and 16.
  • FIGURE 1 a mold is shown at 10 and a continuous line 11 represents the edge of the sump of liquid metal in the mold at a level just under the surface of the melt.
  • FIGURE 1 shows how, in the conventional continuous casting process, the molten metal solidifies much more rapidly near the four corners of the strand than it does near the center portions of the long and short sides. This effect has been called running cold at the corners. There is a good deal of cold set near the corners.
  • a broken line 12 represents the edge of the sump of liquid metal in the strand during a process in accordance with the invention, in which the cooling of the mold and strand is regulated to obtain this effect.
  • the liquid sump is substantially rectangular as seen from above and the four edges of the strand run true. There is no premature cold setting of the short sides and the height of the meniscus can be lowered to about 35 mm. above the bottom of the mold without the molten metal breaking through, for example, at a place near the middle of a face of the strand.
  • the cooling arrangements for the short sides of the strand are preferably separate from those for the long sides. Moreover, in this example, the dilferential cooling is further encouraged by using different spacing and different diameters for spray holes from which water is sprayed onto the short and long sides of the mold and strand.
  • the distance of the meniscus above the bottom of the mold is adjusted by raising and lowering a tundish with nozzles through which the metal is supplied to the mold.
  • a tundish 13 is supported on the short sides 16 of a rectangular slab mold 17, by means of a cranked beam 14 and lifting devices 15.
  • the short sides 16 of the mold are shown in section.
  • the long sides of the mold are shown at 18.
  • a dummy bar 20 is mounted on a raising and lowering piston 21.
  • Example in this example the internal dimensions of the mold are 1020 by 265 mm., to produce slabs having a crosssection of 1000 x 260 mm.
  • the internal wall 19 of the mold is in this example smooth, but it may alternatively be vertically fluted. This wall has a height of mm.
  • the apparatus for supplying the molten metal to the mold comprises the tundish 13 having a body 22, of grey cast iron which is coated inside with mold wash or facing composition.
  • the molten metal reaches the tundish 13 from a pouring spout 23, and leaves the tundish through two outlet nozzles 24, from where it flows on to raised bafile plates 26 in the bottom of a float 25.
  • the baflle plates 26 act in conjunction with the nozzles 24 to regulate the flow of molten metal, the flow being stopped when the meniscus in the mold reaches a predetermined maximum height in relation to the nozzles 24.
  • the pouring spout 23 is disposed horizontally, so that when the tundish 13 is subsequently lowered the spout does not take up too steep an angle.
  • the float 25 is supported by its ends 27 on angle brackets 28, which are themselves supported from the cranked beam 14, by means of slotted bars 29 and bolts 30 with nuts.
  • the float 25 can be raised and lowered, relative to the cranked beam 14 by means of slots 31 in the bars 29 and the angle brackets 28.
  • each of the lifting devices 15 are best described with reference to FIGURES 6, 7 and 8. Actuation of a lever 32 rotates cam discs 33 with the result that a support 37 for the cranked beam 14 is raised or lowered, by means of rollers 34, a roller support 35 and a slide plate 36. In this movement, the plate 36 and the support 37 are guided by sleeves 38 which are fixed to the plate 36, and fit over and slide on pins 39.
  • the raising and lowering of the tundish 13 must of course take place equally at both sides of the machine. This equalization of movement is ensured by a mechanical stop system 40 which functions in conjunction with a series of holes 41, arranged to form a scale.
  • a mechanical stop system 40 which functions in conjunction with a series of holes 41, arranged to form a scale.
  • the operator Before actuating the lever 32, the operator first pushes a lever 42 to draw a pin 43 out of one of the holes 41. As soon as the lever 32 has been rotated as far as is required, the lever 42 is released and the point of the pin 43 moves under the action of a spring 44 and engages in another of the holes 41, so that the lever 32 is locked.
  • the levers 32 on both sides of the machine are actuated successively and are moved through equal angles.
  • the long sides 18 consist of hollow extruded sections made of aluminum/magnesium/silicon alloy. Cooling water is admitted to the interiors 46 of the hollow sections through connections 45, and issues through bores 47, which spray the cooling water against the long sides of the strand as it emerges from the mold. The water is admitted to both ends of the hollow sections and therefore a region of higher pressure is produced near the center portion of the sections. This results in a greater cooling effect here.
  • the distribution of the cooling is further influenced by the absence of bores for 2 /2% of the length of the sections 18 at both ends.
  • the short sides 16 of the mold consist of angle sections in the form of aluminum/ magnesium/ silicon alloy castings. These members are cooled by a spray of water issuing from a spray tube 48, which has two rows of spray holes so arranged that the cooling water is directed, both on to the angle section member and also on to the face of the strand itself just below the bottom edge of the mold.
  • the cooling water is supplied to the stray tube 48 through a connection 49, and the supply of water is controlled by a valve 50.
  • the four sides of the mold are screwed together and are located relatively to each other by dowel pins.
  • the inner surfaces 19 are machined smooth.
  • the mold is mounted on its supports by means of brackets 51.
  • FIGURES 4 and 5 show how the float 25 is constructed so that the molten metal issues horizontally towards the narrow sides of the mold.
  • the float is made of black iron plate 1.5 mm. thick coated with mold wash composition.
  • the tundish body 22 and the pouring spout 23 are removed and the float 25 is adjusted in height relative to the cranked beam by moving the supporting brackets 28 up or down, that is to say the float is set to set the gap between the nozzles 24 and the baffle plate 26 when the tundish body 22 is replaced.
  • the whole tundish and float assembly is then raised to its highest position by actuating the lifting devices by means of the levers 32.
  • the level of the meniscus of the melt must be high in the mold, in order to prevent the float from becoming frozen in near the bottom of the mold.
  • the lowering of the dummy bar on the supporting piston 21 may be commenced.
  • the tundish 13 with the nozzles 24 and the float 25 is lowered slowly until the height of the meniscus level above the lower edge of the mold has decreased to the distance required for the remainder of the casting operation. This lowering must be effected evenly, and this can be done without difficulty with the help of the rows of holes 41.
  • the levers 32 are locked.
  • tundish and float assembly must be raised'again, to prevent it from freezing in, This is done in one movement by means of the levers 32, which lifts the float out of the pool of molten metal in the mold. This lifting movement also causes the residue of molten metal in the pouring spout 23 to run back into the furnace or ladle.
  • FIGURES 12 to 14 The disadvantage is overcome by using the control system shown in FIGURES 12 to 14.
  • This control system is mounted directly on a frame 52 of the casting machine.
  • the tundish assembly 13 is supported by a control frame 53 made of angle iron.
  • the frame 53 is raised and lowered by means of four hydraulic cylinders 55 having pis tons 54.
  • the lifting stroke in this example is mm.
  • the pistons 54 are all lifted simultaneously by means of a pump, such as for instance a manually operated pump 56 that delivers through an equalizing valve 57.
  • the lowering movement is elfected by the weight of the assembly acting on the pistons 54, and the return flow of the oil to the tank 58 is controlled by a control valve 59.
  • the control frame 53 can be operated from a single operating station, and can be held in place at any desired height.
  • FIGURES 15, 16 and 17 show a modification in which instead of the tundish assembly being movable upwards and downwards, the mold is movable.
  • this modification there is a mold 60, a float 61 and a tundish 62 with two feed nozzles 63.
  • the mold 60 rests on two beams 64 the ends of which are connected to a frame 65 which is itself connected by brackets 66 to hydraulic lifting devices 67 in such a way that actuation of the lifting devices 67 raises and lowers the frame 65 as required.
  • the tundish 62 is supported by bars 68 that are supported, in turn, by fixed beams 69.
  • the hydraulic lifting devices 67 and the beams 69 are supported by a frame 70 which rests on the upper part of a housing 71 of the continuous casting machine.
  • the pouring spout has been omitted from the drawing for the sake of greater clarity.
  • the lifting devices 67 have in this example a lifting stroke of 100 mm.
  • Pistons of the lifting devices 67 are simultaneously lifted by a pump such as a manual pump 72 which delivers through a pressure equalizing valve 73, so that the mold 60 is raised or lowered to bring it to the required height relative to the feed nozzles 63 and thus relative to the tundish,
  • the lowering of the mold is effected by the weight of the mold assembly on the pistons of the lifting devices 67, and the return flow of oil into an oil tank 74 is controlled by a control valve 75.
  • the strand is usually lowered into water, the surface of which can be brought to within about 10 cm. of the bottom edge of the mold. Coolants other than water can of course be used if desired and further jets of water can be used for directly cooling the strand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US559290A 1965-06-23 1966-06-21 Continuous casting of non-ferrous metals Expired - Lifetime US3425482A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH881965A CH423108A (de) 1965-06-23 1965-06-23 Verfahren zum vertikalen Stranggiessen von Nichteisenmetallen
CH1254365 1965-09-08

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US3425482A true US3425482A (en) 1969-02-04

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US559290A Expired - Lifetime US3425482A (en) 1965-06-23 1966-06-21 Continuous casting of non-ferrous metals

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US (1) US3425482A (de)
AT (1) AT263244B (de)
BE (1) BE682814A (de)
CH (1) CH456858A (de)
DE (1) DE1508965B1 (de)
DK (1) DK113722B (de)
FI (1) FI46809C (de)
FR (1) FR1567011A (de)
GB (1) GB1096258A (de)
IS (1) IS770B6 (de)
NL (1) NL149723B (de)
NO (1) NO115972B (de)
SE (1) SE317781B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578062A (en) * 1968-03-05 1971-05-11 Nippon Kokan Kk Method of and apparatus for continuous casting with immersion-type long nozzles
US4016924A (en) * 1975-09-17 1977-04-12 Aluminum Company Of America Method of continuous casting with weighted float-distributor
US20070215310A1 (en) * 2006-03-20 2007-09-20 Aleris Aluminum Koblenz Gmbh Distributor for use in a method of casting hot metal
US20110127003A1 (en) * 2009-12-02 2011-06-02 Rays Engineering Co., Ltd Method for producing light alloy vehicle wheel
NO341337B1 (en) * 2015-07-03 2017-10-16 Norsk Hydro As Equipment for continuous or semi-continuous casting of metal with improved metal filling arrangement
WO2019053596A1 (en) * 2017-09-12 2019-03-21 Wagstaff, Inc. DYNAMICALLY POSITIONED DIFFUSER FOR METAL DISTRIBUTION DURING CASTING OPERATION
CN110523944A (zh) * 2018-07-20 2019-12-03 广东韶钢松山股份有限公司 一种方坯连铸机开浇方法及装置
RU2789050C2 (ru) * 2017-09-12 2023-01-27 Уэгстафф, Инк. Диффузор с динамическим позиционированием для распределения металла во время операции литья

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH624029A5 (de) * 1977-12-19 1981-07-15 Alusuisse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2243425A (en) * 1937-05-08 1941-05-27 Rossi Irving Casting of metals and/or metal alloys and more particularly to a method of maintaining a uniform rate of flow of the molten mass into the mold or chill
CH256026A (de) * 1943-10-18 1948-07-31 Wieland Werke Ag Vorrichtung zur selbsttätigen Regelung der Zuführung des Giessguts an Stranggiessmaschinen.
US2876509A (en) * 1953-06-19 1959-03-10 Kaiser Aluminium Chem Corp Apparatus for continuous casting of metal
US2891291A (en) * 1956-01-27 1959-06-23 Kaiser Aluminium Chem Corp Apparatus for continuous casting

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE668700C (de) * 1937-04-20 1938-12-08 Siegfried Junghans Vorrichtung zum Einhalten einer gleichmaessigen Giessmenge bei ununterbrochenem Giessverfahren
US2683294A (en) * 1949-05-28 1954-07-13 Aluminum Co Of America Metal transfer method and apparatus
US2672665A (en) * 1950-03-13 1954-03-23 Kaiser Aluminium Chem Corp Casting metal
US2754556A (en) * 1952-09-03 1956-07-17 Kaiser Aluminium Chem Corp Method and means of continuous casting of light metals
DE1140675B (de) * 1957-10-14 1962-12-06 Rheinstahl Eisenwerke Gelsenki Zufuehrungsgefaess zum selbsttaetigen Zufuehren des Giesswerkstoffes beim Stranggiessen
US2983972A (en) * 1960-11-17 1961-05-16 Reynolds Metals Co Metal casting system
US3212142A (en) * 1962-02-15 1965-10-19 Reynolds Metals Co Continuous casting system
FR1398526A (fr) * 1964-06-12 1965-05-07 Aluminium Lab Ltd Procédé de coulée continue des métaux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2243425A (en) * 1937-05-08 1941-05-27 Rossi Irving Casting of metals and/or metal alloys and more particularly to a method of maintaining a uniform rate of flow of the molten mass into the mold or chill
CH256026A (de) * 1943-10-18 1948-07-31 Wieland Werke Ag Vorrichtung zur selbsttätigen Regelung der Zuführung des Giessguts an Stranggiessmaschinen.
US2876509A (en) * 1953-06-19 1959-03-10 Kaiser Aluminium Chem Corp Apparatus for continuous casting of metal
US2891291A (en) * 1956-01-27 1959-06-23 Kaiser Aluminium Chem Corp Apparatus for continuous casting

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578062A (en) * 1968-03-05 1971-05-11 Nippon Kokan Kk Method of and apparatus for continuous casting with immersion-type long nozzles
US4016924A (en) * 1975-09-17 1977-04-12 Aluminum Company Of America Method of continuous casting with weighted float-distributor
US20070215310A1 (en) * 2006-03-20 2007-09-20 Aleris Aluminum Koblenz Gmbh Distributor for use in a method of casting hot metal
US7559353B2 (en) * 2006-03-20 2009-07-14 Aleris Aluminum Koblenz Gmbh Distributor for use in a method of casting hot metal
US20110127003A1 (en) * 2009-12-02 2011-06-02 Rays Engineering Co., Ltd Method for producing light alloy vehicle wheel
NO341337B1 (en) * 2015-07-03 2017-10-16 Norsk Hydro As Equipment for continuous or semi-continuous casting of metal with improved metal filling arrangement
WO2019053596A1 (en) * 2017-09-12 2019-03-21 Wagstaff, Inc. DYNAMICALLY POSITIONED DIFFUSER FOR METAL DISTRIBUTION DURING CASTING OPERATION
CN111093858A (zh) * 2017-09-12 2020-05-01 瓦格斯塔夫公司 用于在铸造操作过程中分配金属的动态定位的扩散器
US10913108B2 (en) 2017-09-12 2021-02-09 Wagstaff, Inc. Dynamically positioned diffuser for metal distribution during a casting operation
CN111093858B (zh) * 2017-09-12 2021-09-28 瓦格斯塔夫公司 用于在铸造操作过程中分配金属的动态定位的扩散器
US11292051B2 (en) 2017-09-12 2022-04-05 Wagstaff, Inc. Dynamically positioned diffuser for metal distribution during a casting operation
RU2789050C2 (ru) * 2017-09-12 2023-01-27 Уэгстафф, Инк. Диффузор с динамическим позиционированием для распределения металла во время операции литья
CN110523944A (zh) * 2018-07-20 2019-12-03 广东韶钢松山股份有限公司 一种方坯连铸机开浇方法及装置
CN110523944B (zh) * 2018-07-20 2021-06-01 广东韶钢松山股份有限公司 一种方坯连铸机开浇方法及装置

Also Published As

Publication number Publication date
AT263244B (de) 1968-07-10
NL149723B (nl) 1976-06-15
FI46809C (fi) 1973-07-10
IS1560A7 (is) 1966-06-01
FR1567011A (de) 1969-05-16
CH456858A (de) 1968-05-31
DE1508965B1 (de) 1973-09-27
NL6607206A (de) 1966-12-27
BE682814A (de) 1966-12-01
IS770B6 (is) 1971-03-09
DK113722B (da) 1969-04-21
NO115972B (de) 1969-01-06
SE317781B (de) 1969-11-24
GB1096258A (en) 1967-12-20
FI46809B (de) 1973-04-02

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