US3233884A - Furnace for the treatment of strip metals - Google Patents

Furnace for the treatment of strip metals Download PDF

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Publication number
US3233884A
US3233884A US221741A US22174162A US3233884A US 3233884 A US3233884 A US 3233884A US 221741 A US221741 A US 221741A US 22174162 A US22174162 A US 22174162A US 3233884 A US3233884 A US 3233884A
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chamber
furnace
strip
metal
rolls
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US221741A
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English (en)
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Laine Bernard
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Individual
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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/66—Tower-type furnaces

Definitions

  • the invention has for its object a furnace for the treatment (annealing and quenching) of strip metals, in particular aluminium or copper alloys.
  • the furnace according to the invention is constituted by a chamber having a vertically elongated shape, preferably with a narrow rectangular section, the lower end .of which communicates with a tank which contains a cooling liquid for the treated metal, said chamber being provided at its upper end with means for the continuous supply of the strip metal to be treated and at its lower end with means to continuously withdraw the treated strip metal, whereas along the path of the metal in said chamber suitable means are arranged for the heating of said metal.
  • FIG. 1 is a vertical cross section taken along line I-I of FIG. 2;
  • FIG. 2 is a vertical cross section taken along the broken line IIII of FIG. 1, and
  • FIG. 3 shows to an enlarged scale a detail of the upper part of FIG. 1.
  • the furnace for the annealing and quenching treatment of strips of aluminium or copper alloys is essentially constituted by a chamber 1 having a vertically elongated shape and a narrow rectangular section, supported by a framing 2 and the lower end of which communicates with a tank 3 which contains a cooling liquid for the treated metal.
  • the chamber is surrounded by a casing 6 which is in communication with the inside of chamber 1, on one hand in the vicinity of the lower end thereof through openings 7 and, on the other hand, in the vicinity of the upper end thereof through openings 8.
  • a blower 17 supplies combustion air, through a piping 16, to a set of gas burners generally denoted by 18 and opening into chamber 1 in the vicinity of the upper end of the latter. Said burners are designed to bring the metal to be treated to the desired temperature for instance of the order of 650 to 750 C.
  • the hot gases circulate in a closed circuit in the upward direction in chamber 1 and in the downward direction in the casing 6. Said gases are circulated, in the example, by means of a plurality (four in the shown embodiment) of outward-flow turbines, such as 11, each 3,233,834 Patented Feb. 8, 1966 of them being driven from an electric motor 12 through a V-belt transmission 13.
  • Electrical resistances such as 21 are distributed practically the whole height of chamber 1, underneath the gas burners 18, and are designed to keep the metal at the temperature to which it is raised by said burners 18.
  • the strip metal to be treated is introduced into the upper end of chamber 1 and it comesout therefrom, in the treated condition, at its lower end.
  • the upper part of the framing 2 supports a platform 24 on which there is mounted a feeding system including four rolls 25, 26, 27, 28 whose outer cylindrical surface is coated with a layer of rubber.
  • Rolls 25 and 27 are substantially tangent along a generating line which is in the middle vertical plane of chamber 1, whereby the roll 27 may be applied, preferably elastically, against the roll 25.
  • the roll 23 rests on the roll 25 and may be applied also elastically against the latter or through a pressure adjusting screw system.
  • Said four feed rolls are driven from a motor provided with a reducing gear 31, the output shaft of which is connected through a belt or chain transmission 32 with the shaft 33 of the roll 25.
  • the shaft 33 carries a gear 34 engaged with two other gears 35, 36, respectively integral with the two rolls 27, 28.
  • the roll 26 is driven from the roll 25 by a chain or belt transmission 37.
  • the strip of metal 16 to be treated passes first over the roll 26 then between the rolls 25 and 28 and finally between the rolls 25 and 27 of the feeding device. It passes then between two rubber lined centering rolls 38, 39 which are also supported by the platform 24 and hence it descends vertically through the Whole height of chamber 1. At the exit from the lower end of chamber 1, the strip of the treated metal 10 passes under a rubber lined tension roll 41, then between a pair of rubber lined withdrawing rolls 42, 43 and hence leaves the furnace equipment.
  • the tension roll 41 is vertically movable in two slide ways 45, 46 in which both ends of its shaft 47 may slide.
  • the Weight of roll 41 determines the tension of the metal strip which is already tensioned, in its vertical course inside chamber 1, by its own weight.
  • the withdrawing rolls 42, 43 are driven through a transmission 49 from a unit including an electric motor and a speed adjusting device generally denoted by 51, the assembly being designed and arranged in such a way that the withdrawing speed of both rolls 42, 43, at the exit of the furnace, are under the control of speed of the upper feed rolls.
  • a unit including an electric motor and a speed adjusting device generally denoted by 51 the assembly being designed and arranged in such a way that the withdrawing speed of both rolls 42, 43, at the exit of the furnace, are under the control of speed of the upper feed rolls.
  • any suitable conventional equipment is used.
  • Centering rolls 38, 39 are mounted on the ends of two horizontal push-members 54, 55, respectively, which are connected to the rods of two jacks 56, 57.
  • By actuating the jacks in either direction it is possible to retract both rolls 38, 39, in particular to make pass between them the end of a metal strip to be treated when beginning to introduce the latter into the furnace or, contrarily, to move them toward each other so that they press between themselves the metal strip which descends into the furnace.
  • chamber 1 which is comprised between the high heating area, which includes the gas burners 18, and the level of the platform 24, is surrounded by a pre-heating chamber 58.
  • the entry of the metal into said chamber 58 takes place between two rims 61, 62 (FIG. 3) which are constituted by two coolant chambers or water-jackets in which cooling water circulates.
  • Ducts 63 for the exhaust of the heating gases communicate with pre-heating chamber 58.
  • each of said guide-blocks such as the guideblock 65, is horizontally adjustable in the direction of that guide-block'whioh faces it, by means of any suitable adjusting system denoted in its entirety by 69.
  • shutter 71 which inclination may be adjusted by means of hand levers 72 which are operable from the outside to regulate the quantity of the air which is recycled in chamber 1.
  • the working of the furnace is as follows:
  • the metal strip 10 to be treated is driven by the feed rolls 25 to 28 and is introduced into the upper end of chamber 1, between the centering rolls 38, 39. It is first submitted to a pre-heating in the upper chamber 58 in which it is degreased by the evaporation of the oils; it passes then between the gas burners 18 which raise its temperature to the vicinity of 650 to 700 C. It descends on into chamber 1 between the electrical resistances 21 which maintain it at said temperature. It comes out at the lower end of chamber 1 and passes then into the liquid which is contained in the tank 3 so that, after having been submitted to an annealing in chamber 1, it is quenched in saidliquid. It passes round the roll 41 which maintains it at the desired tension and it emerges from the equipment through the withdrawing rolls 42', 43.
  • the apparatus produces strip metals of a very high quality having a very fine grain and without any scratches since the sheets or strips descend vertically without being in contact with driving or guiding members.
  • the graphite guide-blocks are practically not in contactwith the metal strips, in any event, do not exert pressure against it; they merely serve to keep it in the centered condition in the event it should have a tendency to deviate very l slightly from the middle vertical plane of the chamber.
  • the strip thus retains a very beautiful appearance.
  • the furnace has a relatively small height and the treatment is performed very quickly.
  • An annealing furnace for continuously heating and quenching non-ferrous strip metal, particularly strip of aluminium, copper, and alloys thereof, said furnace comprising in combination, a vertically elongated chamber having an upper end and a lower end; means for feeding the strip metal through said upper end for passage downwardly through said chamber along a substantially central vertical plane therethrough; a tank containing a cooling liquid positioned adjacent and in communication with the lower end of said chamber; means adjacent the lower end of said chamber operable to draw strip metal from said feeding means downwardly through said chamber and through the cooling liquid in said tank for discharge from said furnace; oxy-fuel burners positioned adjacent but below said upper end of said chamber for directing hot combustion gases perpendicularly against opposite surfaces of strip metal passing through said chamber to heat the strip metal to an annealing temperature; and electric heating means disposed along said chamber between the location of said burners and said lower end of said chamber, and in heat transfer relation with the metal strip to maintain said annealing temperature of the metal strip during passage thereof through said chamber.
US221741A 1962-08-10 1962-09-06 Furnace for the treatment of strip metals Expired - Lifetime US3233884A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR906734A FR1338926A (fr) 1962-08-10 1962-08-10 Four pour le traitement de feuillards

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US3233884A true US3233884A (en) 1966-02-08

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FR (1) FR1338926A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312576A (en) * 1963-07-03 1967-04-04 Reynolds Metals Co Method of treating metal
US20090139350A1 (en) * 2006-10-21 2009-06-04 Matthias Kipping Device for Measuring the Strip Tension in a Metal Strip

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1890065A (en) * 1927-06-26 1932-12-06 Swindell Dressler Corp Method and apparatus for heat treating sheet metal
US2926902A (en) * 1956-01-27 1960-03-01 Sunbeam Equip Heat-treating furnace
US2933425A (en) * 1957-02-26 1960-04-19 Selas Corp Of America Strip heating

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1890065A (en) * 1927-06-26 1932-12-06 Swindell Dressler Corp Method and apparatus for heat treating sheet metal
US2926902A (en) * 1956-01-27 1960-03-01 Sunbeam Equip Heat-treating furnace
US2933425A (en) * 1957-02-26 1960-04-19 Selas Corp Of America Strip heating

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312576A (en) * 1963-07-03 1967-04-04 Reynolds Metals Co Method of treating metal
US20090139350A1 (en) * 2006-10-21 2009-06-04 Matthias Kipping Device for Measuring the Strip Tension in a Metal Strip
US7856894B2 (en) * 2006-10-21 2010-12-28 Sms Siemag Aktiengesellschaft Device for measuring the strip tension in a metal strip

Also Published As

Publication number Publication date
FR1338926A (fr) 1963-10-04

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