US3868988A - Method of continuous casting molten copper in a seamless-pipe-shaped mould - Google Patents

Method of continuous casting molten copper in a seamless-pipe-shaped mould Download PDF

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Publication number
US3868988A
US3868988A US340151A US34015173A US3868988A US 3868988 A US3868988 A US 3868988A US 340151 A US340151 A US 340151A US 34015173 A US34015173 A US 34015173A US 3868988 A US3868988 A US 3868988A
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United States
Prior art keywords
mould
metal
pipe
lead
copper
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Expired - Lifetime
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US340151A
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English (en)
Inventor
Bror Olov Nikolaus Hansson
Johan Olov Bror Hertsius
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting

Definitions

  • ABSTRACT A casting method for the continuous production of elongated ingots of metal, whereby the metal to be cast is passed in a fluid state into the interior of a generally pipe-shaped mould of metal or other heat resistant, easily extruded material, which is continuously manufactured by extrusion at the same rate as the casting and thoroughly cooled on its outside. Subsequent to the cooling the mould may be removed from the ingot.
  • an auxiliary means is used as a casting mould, but this mould is inexpensive to manufacture and moreover gives so many advantages that it may be used just once, It is produced just before or simultaneously with the casting and is stripped off after the casting.
  • This mould preferably consists of a continuous thin walled pipe of a metal such as lead or a lead alloy. While this mould is manufactured e.g., by extrusion it is thoroughly cooled down and continuously filled with the molten casting metal and from the outside of the mould further cooled during and after the casting. This extrusion, casting and cooling may be followed by stripping off the metal mould from the ingot and the removed metal mould material is then returned to the melting kettle of the extrusion machine and remelted for reuse.
  • the mould should have good heat conductivity and thin walls, have close tolerances and, while it is extruded, have enough strength that a vacuum or a small overpressure may be maintained inside the mould. It is also important that the mould may be manufactured with high axial speed and with constant speed. Continuous extrusion is a manufacturing process which meets all those demands.
  • FIG. 1 shows one embodiment of the present invention, partly in cross section
  • FIG. 2 shows examples of some contours that can be produced with the arrangement of FIG. 1.
  • FIG. 1 shows how a continuous ingot (e.g., of copper) is cast inside a continuously extruded lead pipe.
  • the lead is melted in a melting kettle l and from the kettle it flows through the feeding pipe 2 to a continu- LII ous screw extruder.
  • the molten lead is cooled down to solidification by means of the (water-)cooling channels 17 so that a nut is formed around the screw 4.
  • This nut of lead is forced upwards by the threads of the rotating screw, and dies 5, 6 shape the inner and outer surfaces of the extruded mould or pipe 7.
  • the lead on itsway to the dies 5, 6 has a rather long way to travel and thus may be conveniently cooled down so that, first of all the solidification heat is dissipated away from the metal.
  • the pipe When the outer end of the extruded pipe is tightened the pipe may be evacuated by means of e.g., a vacuum pump (not shown) which is connected to a channel in an outer part 15 of the die 5.
  • a vacuum pump (not shown) which is connected to a channel in an outer part 15 of the die 5.
  • This vacuum maintained in the lead pipe, willthen suck molten lead (e.g., copper) from the kettle 12 to and into the mould or pipe 7, where this molten copper is cooled down to solidification e.g., by means of water cooling on the outside of the pipe 7.
  • molten lead e.g., copper
  • This molten copper is cooled down to solidification e.g., by means of water cooling on the outside of the pipe 7.
  • much cooling is needed, which e.g., may be achieved by means of evaporation of the water which dissipates 539 kilocalories per kg of water evaporated.
  • the filling of the mould with molten metal may be carried out in various ways depending on the dimensions of the ingot. For instance, a few examples might be as follows:
  • the filling of the mould may be controlled.
  • the filling may be monitored by measuring the electrical resistance between two points on the outer surface of the pipe-shaped mould, whereby the distance between these two points is predetermined.
  • Supersonic waves may be used for the monitoring of the filling.
  • a sensor such as a cog wheel pressed against the outside of the mould and thus rotating with its progress, will by indentations on the mould detect irregularities on the ingot.
  • Re-use of the lead may also be arranged as follows:
  • the lead pipe with its ingot is at first cooled until a tight shell of solidified copper is formed at the outer surface of the ingot. If the interior of the ingot still holds sufficient heat, this heat will creep out to the outside surface and there melt off the lead mould and this molten lead may then be directly returned to the lead melting kettle, whereafter the ingot is further cooled down to suitable handling temperature (e. g., by a water spray).
  • suitable handling temperature e. g., by a water spray
  • the melting, the extrusion and the casting may be arranged in vacuum or under a protectiveatmosphere, and the outside surface of the extruded lead mould may be held at the temperature of the cooling water.
  • the mould may e.g., be equipped with cooling fins or the mould may be given a shape which is more adapted for rapid conduction of heat from the interior of the ingot to the outside of the mould than the mould with a circular cross section.
  • Such shapes are shown in 15 FIG. 2. They will for a short time withstand sufficient vacuum or pressure inside the mould.
  • a casting method for the continuous production of elongated copperingots which comprises ping machines for lead are available. a. continuously extruding lead so as to form a solid According to FIG. 1 the leadis fed to the extrusion thin-walled mould having the general shape of a machine by gravity forces from a melting kettle atseamless pipe, mospheric pressure, and the copper is sucked into the b. continuously injecting into the interior of said solid mould by a syphon. If an ingot of high purity is desired, pipe-shaped lead mould a molten mass of copper, both kettles may have a vacuum or a protective atmoc. regulating the rate of extrusion of the lead and the sphere over the free metal surfaces.
  • the casting method may be varied depending on of said solid pipe-shaped lead mould and linear what metal is used in the mould or in the ingot.
  • Lead pipe Extrusion said injected copper after said copper has solidified. 2.
  • a casting method for the continuous production of elongated metal ingots which comprises a. continuously extruding a first metal so as to form a solid thin-walled mould having the general shape of a seamless pipe,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Extrusion Of Metal (AREA)
US340151A 1972-03-10 1973-03-12 Method of continuous casting molten copper in a seamless-pipe-shaped mould Expired - Lifetime US3868988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03025/72A SE361271B (en, 2012) 1972-03-10 1972-03-10

Publications (1)

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US3868988A true US3868988A (en) 1975-03-04

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US340151A Expired - Lifetime US3868988A (en) 1972-03-10 1973-03-12 Method of continuous casting molten copper in a seamless-pipe-shaped mould

Country Status (5)

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US (1) US3868988A (en, 2012)
CA (1) CA998225A (en, 2012)
GB (1) GB1427044A (en, 2012)
NO (1) NO131492C (en, 2012)
SE (1) SE361271B (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100960A (en) * 1977-01-28 1978-07-18 Technicon Instruments Corporation Method and apparatus for casting metals
USRE30979E (en) * 1977-01-28 1982-06-22 Technicon Instruments Corporation Method and apparatus for casting metals
US4580616A (en) * 1982-12-06 1986-04-08 Techmet Corporation Method and apparatus for controlled solidification of metals
US5207776A (en) * 1991-10-04 1993-05-04 The Babcock & Wilcox Company Bi-metallic extrusion billet preforms and method and apparatus for producing same
CN101704028B (zh) * 2009-10-26 2011-09-07 无锡隆达金属材料有限公司 一种电厂用铜合金冷凝管的在线退火三联拉工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3016173C2 (de) * 1980-04-26 1983-01-20 Degussa Ag, 6000 Frankfurt Verfahren und Vorrichtung zum Stranggießen von Alkalimetall unter Druck

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128941A (en) * 1936-04-01 1938-09-06 American Rolling Mill Co Direct casting of sheetlike metal structures
US3414043A (en) * 1965-03-27 1968-12-03 Wagner Anton Robert Method for the continuous transferring of liquid metals or alloys into solid state with desired cross section without using a mould
US3421569A (en) * 1966-03-11 1969-01-14 Kennecott Copper Corp Continuous casting
US3421571A (en) * 1965-03-09 1969-01-14 New York Wire Co Process for casting clad metal bars

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128941A (en) * 1936-04-01 1938-09-06 American Rolling Mill Co Direct casting of sheetlike metal structures
US3421571A (en) * 1965-03-09 1969-01-14 New York Wire Co Process for casting clad metal bars
US3414043A (en) * 1965-03-27 1968-12-03 Wagner Anton Robert Method for the continuous transferring of liquid metals or alloys into solid state with desired cross section without using a mould
US3421569A (en) * 1966-03-11 1969-01-14 Kennecott Copper Corp Continuous casting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100960A (en) * 1977-01-28 1978-07-18 Technicon Instruments Corporation Method and apparatus for casting metals
USRE30979E (en) * 1977-01-28 1982-06-22 Technicon Instruments Corporation Method and apparatus for casting metals
US4580616A (en) * 1982-12-06 1986-04-08 Techmet Corporation Method and apparatus for controlled solidification of metals
US5207776A (en) * 1991-10-04 1993-05-04 The Babcock & Wilcox Company Bi-metallic extrusion billet preforms and method and apparatus for producing same
CN101704028B (zh) * 2009-10-26 2011-09-07 无锡隆达金属材料有限公司 一种电厂用铜合金冷凝管的在线退火三联拉工艺

Also Published As

Publication number Publication date
SE361271B (en, 2012) 1973-10-29
CA998225A (en) 1976-10-12
NO131492C (en, 2012) 1975-06-11
NO131492B (en, 2012) 1975-03-03
AU5314373A (en) 1974-09-12
GB1427044A (en) 1976-03-03

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