US3861658A - Mobile metal melt contact system for the transmission of annealing currents - Google Patents

Mobile metal melt contact system for the transmission of annealing currents Download PDF

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Publication number
US3861658A
US3861658A US345201A US34520173A US3861658A US 3861658 A US3861658 A US 3861658A US 345201 A US345201 A US 345201A US 34520173 A US34520173 A US 34520173A US 3861658 A US3861658 A US 3861658A
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US
United States
Prior art keywords
metal
fountain
molten metal
bath
contact
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
Application number
US345201A
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English (en)
Inventor
Janos Prohaszka
Andor Mandoki
Rudolf Welesz
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.)
Licencia Talalmanyokat Ertekesito Vallalat
Original Assignee
Licencia Talalmanyokat Ertekesito Vallalat
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.)
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Publication date
Application filed by Licencia Talalmanyokat Ertekesito Vallalat filed Critical Licencia Talalmanyokat Ertekesito Vallalat
Application granted granted Critical
Publication of US3861658A publication Critical patent/US3861658A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0004—Devices wherein the heating current flows through the material to be heated
    • H05B3/0009—Devices wherein the heating current flows through the material to be heated the material to be heated being in motion

Definitions

  • the present invention provides as one of the contacts a fountain of molten metal that sprays I against the underside of the stock.
  • Molten metal is in electrical contact with a current source, and a motordriven helical pump immersed in a bath of molten metal continuously provides the fountain.
  • MOBILE METAL MELT CONTACT SYSTEM FOR THE TRANSMISSION OF ANNEALING CURRENTS For the annealing of semi-finished metal stock, finished stock of continuously moving metal or metal alloys, such as tapes, wires, bars, tubes to be used in a variety of technological processes, such as coating with molten metal, soldering, butt welding, heat treatment, etc. recourse is often had to the Joule effect of the current flowing through the material. In such and similar cases the selection of a system of contacts for the transmission of the current to the work may pose a problem difficult to solve.
  • One method for this purpose is the transmission of current through rolling contacts, rollers, cylinders and the like. Another method is the conduction of the continuously moving work into a molten metal bath.
  • the current enters the product at the point of immersion in the metal bath.
  • difficulties may have to be overcome at the transmission of current between the contact rollers owing to the coarse, uneven, occasionally oxide-coated surfaces, or owing to the inevitable high surface load.
  • the introduction of the workpiece into the metal bath and its subsequent removal from the bath give rise to design problems.
  • a system of conductors has to be designed which enables the immersion of tapes, wires, tubes, bars, etc. in the bath, and then their removal from the bath.
  • the new system of contacts permits the tapes, wires, bars, etc. to be annealed to advance on a roller or slide path, horizontally or nearly horizontally.
  • the work passes over molten metal streaming from below upward, pouring through the orifice of a conduit, and then falling back into a basin.
  • the metal streaming from below reaches and makes contact with the work, and drops then into the melt basin.
  • There a pump drives the metal melt back to the site of contact. In this manner the continuously recycled molten metal establishes a definite, safe electrical contact with the work passing over the surface of the bath, without the immersion of the work in the bath.
  • At least one pole of a current source is connected to the molten metal contact, the other pole being connected to a second molten metal contact or to a conventional contact, the use of even one contact according to the present invention improving the performance.
  • the circuit is thus completed through the work, with the following advantages:
  • FIG. 1 is a somewhat schematic side elevational view of an installation according to the present invention.
  • FIG. 2 is an enlarged fragment of the fountain bath shown in FIG. 1.
  • metal strip 1 passes over an'entry roll and is collected by winding on a final roll 2.
  • Strip 1 passes through opposed contact rolls 3 of a conventional nature which serve as one electrical contact; and a relatively short length 4 of strip 1 emerging from rolls 3 then passes through the second or other contact 5 and thence through graphite wiping members 6 by which any remaining molten metal is removed.
  • the strip then moves into a work station 7 in which an operation such as cooling or the application of printed circuitry or other further work operations may be performed on the strip, prior -to rolling the stripon the roll 2.
  • a current source 8 is connected at one pole through conventional brushes 9 to one of the rolls 3 and at the other pole to contact 5.
  • FIG. 2 Further details of the contact 5 are shown in FIG. 2.
  • the strip is shown passing above a housing 11 which defines a bath 12 of electrically conductive liquid, preferably molten metal such as molten lead.
  • Heating elements 13 may be provided to maintain the bath of liquid at the desired temperature.
  • a fountain projector 14 for molten metal or other electrically conductive liquid comprising a discharge nozzle 15 fed by a screw conveyor 16 driven in rotation by a motor 17.
  • Molten metal is drawn in through the casing of projector 14 through openings 18, and is discharged upwardly against the underside of the strip 1, whence it falls back down to the bath 12, the electrical circuit being maintained through the continuous upwardly moving stream of molten metal to the strip 1 and thence through portion 4 of the strip to the associated roll 3 and through brush 9 to current source 8.
  • the area of the strip I bathed by the molten metal is confined by asbestos rings 19 supported by housing 11 and a circular cover 20.
  • a manganese steel strip of 0.20 percent carbon content, of the Hungarian standard CS2 with a width of 10 mm. and a thickness of 1 mm.
  • it is suitable to position the contacts 3 and 5 apart by a distance of 2 meters, and to employ a bath 12 of 200 kg. of molten lead, an orifree 5 mm. wide for nozzle 15, and to direct the lead against the underside of the moving strip positioned 15 mm. above the surface of bath 12, with a velocity sufficient to bathe a length of strip of 60 mm.
  • the current source 8 may supply current at 40 volts and 180 amps,
  • the terminal for contact may be immersed in bath 12 as shown in FIG. 1 or secured to housing 11 as shown in FIG. 2, the length 4 of strip 1 attaining a temperature of 700C. in either case.
  • the strip speed of course predetermines the annealing time.
  • apparatus for annealing a continuous moving length of metal comprising means establishing electrical contact with said metal at a pair of points spaced apart a substantial distance in the direction of movement of the metal, and means for passing an electric current from a source of current through said metal between said contact means; the improvement in which at least one of said contact means comprises a quantity of electrically conductive liquid in electrical circuit with said source of current, means to project said liquid upwardly in a fountain against the underside of said metal, said fountain projecting means comprising a pump having an upwardly directed outlet, and power means to operate said pump.
  • Apparatus as claimed in claim 1 and means to collect said quantity of liquid in a bath back to which the liquid of said fountain falls by gravity after contacting said metal, and means for supplying liquid from said bath to said fountain.
  • said pump comprising a vertical cylindrical casing housing a helical worm, said power means rotating said worm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Resistance Heating (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Molten Solder (AREA)
  • Coating With Molten Metal (AREA)
US345201A 1972-03-24 1973-03-26 Mobile metal melt contact system for the transmission of annealing currents Expired - Lifetime US3861658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUPO512A HU166761B (en, 2012) 1972-03-24 1972-03-24

Publications (1)

Publication Number Publication Date
US3861658A true US3861658A (en) 1975-01-21

Family

ID=11000570

Family Applications (1)

Application Number Title Priority Date Filing Date
US345201A Expired - Lifetime US3861658A (en) 1972-03-24 1973-03-26 Mobile metal melt contact system for the transmission of annealing currents

Country Status (6)

Country Link
US (1) US3861658A (en, 2012)
JP (1) JPS4914307A (en, 2012)
DD (1) DD104102A5 (en, 2012)
DE (1) DE2313834B2 (en, 2012)
HU (1) HU166761B (en, 2012)
IT (1) IT982618B (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056703A (en) * 1974-10-30 1977-11-01 "Licencia" Talalmanyokat Ertekesito Vallalat Process and apparatus for resistance heating of electrically conductive workpieces

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5349010U (en, 2012) * 1976-09-29 1978-04-25

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1118418A (en) * 1910-12-05 1914-11-24 Westinghouse Lamp Co Electrical terminal device.
US2445866A (en) * 1943-08-09 1948-07-27 Olin Ind Inc Apparatus for electric resistance heating of moving metallic strip
US2556349A (en) * 1945-04-30 1951-06-12 Oscar C Trautman Apparatus for heat-treating wire and the like
US3335260A (en) * 1964-12-18 1967-08-08 Niehoff Kommandit Ges Maschf Annealing apparatus for wire and like conductors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1118418A (en) * 1910-12-05 1914-11-24 Westinghouse Lamp Co Electrical terminal device.
US2445866A (en) * 1943-08-09 1948-07-27 Olin Ind Inc Apparatus for electric resistance heating of moving metallic strip
US2556349A (en) * 1945-04-30 1951-06-12 Oscar C Trautman Apparatus for heat-treating wire and the like
US3335260A (en) * 1964-12-18 1967-08-08 Niehoff Kommandit Ges Maschf Annealing apparatus for wire and like conductors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056703A (en) * 1974-10-30 1977-11-01 "Licencia" Talalmanyokat Ertekesito Vallalat Process and apparatus for resistance heating of electrically conductive workpieces

Also Published As

Publication number Publication date
DD104102A5 (en, 2012) 1974-02-20
DE2313834B2 (de) 1974-11-21
HU166761B (en, 2012) 1975-05-28
JPS4914307A (en, 2012) 1974-02-07
DE2313834A1 (de) 1973-10-04
IT982618B (it) 1974-10-21

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