US1704036A - Annealing furnace - Google Patents
Annealing furnace Download PDFInfo
- Publication number
- US1704036A US1704036A US751025A US75102524A US1704036A US 1704036 A US1704036 A US 1704036A US 751025 A US751025 A US 751025A US 75102524 A US75102524 A US 75102524A US 1704036 A US1704036 A US 1704036A
- Authority
- US
- United States
- Prior art keywords
- wire
- tube
- furnace
- lead
- annealing
- 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
Links
Images
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
- 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
- C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
Definitions
- This invention relates to the annealing and heat treating of wire and the like, and pertains more particularly to an improved non-oxidizing method of annealing or heat treating wire in an electric furnace.
- the objects of the invention are to prevent oxidation of the wire under treatment and to prevent arcs by contact of the wire with the furnace, thus eliminating pits inV the wire.
- an electrical contacting device which may be a molten bath of lead or the like, thence through an elongated tube and afterwards through a second contacting device, the two molten baths of lead and the tube through which the wire is passed, being all located in an electric circuit, which not only assists in producing the necessary heat to keep the lead ,in molten state and to heat the tube to properly anneal the wire, but also prevents oxidation and pitting of the wire b contact with the tube since there is no di erence in potential between the wire and the tube.
- Oxidation may be'further eliminated by extending each end of the tube into the adjacent molten bath of lead, thus sealing the tube and preventing the wire from .contacting with the outer atmosphere during the time it is passing through the tube.
- Fi 2 a cross section of a modified form of tu e.
- the furnace to which the invention pertains may comprise an elongated shell 1 closed at its ends as by the heads 2 of insulation material, a metal tube 3 extending centrally through the furnace and protruding from each end thereof, the space between vthe tube and shell being lled with suitable heat insulating material, such as kiesel- 'gphr or thelike, as indicated at 4.
- An electrode 5 may be provided upon each end ⁇ portion of the tube 3 in the form of a.
- a tank'8 containing a bath of lead or the like, as shown at 9, may be connected to the electrode 5 at the inlet end of the furnace, and a similar tank 8a containing a bath of lead or the like, as indicated at 9a, may be connected to the electrode at the discharge end of the furnace, and in order to hermetically vseal the tube 3 to prevent oxidation, the ends of the tube may be bent downward, as shown at l() and extended into the lead baths, effectually sealing the tube, although when it is not desirable or necessary to prevent oxidation, the tube may terminate at points spaced from the contacting devices.
- any suitable form of auxiliary heater such as shown at 11, may be provided, and the auxiliary heater at the entrance end of the furnace will be maintained throughout the operation, due to the chilling effect of the cold wire entering the bath.
- a roller 12 is provided in the lower portion of each of the tanks, and in annealing the wire, indicated at 13, the same is progressively drawn from a reel 14 located near the tank 8, being passed downward through the molten bath of lead beneath the roller 12 and then through the tube 3 and into the bath of lead in the tank 8, under the roller 12 and wound upon a rcel 15.
- a contacting device comprising a pairof ltension rollers or other tension device may be substituted for the fluid conductors which,
- t0 substantially surround the wire, brick or the like, as shown at 3b, being provided for closing the open side thereof.
- a furnace for annealing or heat treating wire or the like including a hermetically sealed tube, means for passing a Wire. through the tube, and means includingjluid,
- a furnace for annealing or heat treating wire or the like including a tube, a fluid conductor at each end of the tube, means for passing a wire through the fluid conductors and tube, and means for passing an electric current through the ⁇ fluid conductors and tube.
- a furnace for annealing or heat treating wire or the like including a tube, a'
Description
- March 5, 1929. F T COPE 1,704,036
ANNEALING FURNACE Filed NOV. 20, 1924 Patented Mar. 5, 1929.
UNITED STATES PATENT oEFlcE.
FRANK T. COPE, 0F SALEM, OHIO, ASSIGNOR T0 THE ELECTRIC FUBNACE COMPANY, OF SALEM, OHIO, A; CORPORATION OF OHIO.
ANNEALING FURNACE.
Application led November 20, 1924. Serial No. 751,025.
This invention relates to the annealing and heat treating of wire and the like, and pertains more particularly to an improved non-oxidizing method of annealing or heat treating wire in an electric furnace.
The objects of the invention are to prevent oxidation of the wire under treatment and to prevent arcs by contact of the wire with the furnace, thus eliminating pits inV the wire.
The above and other objects may be attained by passing the'wire to be treated through an electrical contacting device which may be a molten bath of lead or the like, thence through an elongated tube and afterwards through a second contacting device, the two molten baths of lead and the tube through which the wire is passed, being all located in an electric circuit, which not only assists in producing the necessary heat to keep the lead ,in molten state and to heat the tube to properly anneal the wire, but also prevents oxidation and pitting of the wire b contact with the tube since there is no di erence in potential between the wire and the tube.
Oxidation may be'further eliminated by extending each end of the tube into the adjacent molten bath of lead, thus sealing the tube and preventing the wire from .contacting with the outer atmosphere during the time it is passing through the tube.
' An embodiment of the invention is illustrated in the accompanying drawing, in Which- Figure 1 is a longitudinal, sectional view through a furnace illustrating the improved method of annealing; and
Fi 2, a cross section of a modified form of tu e.
Similar numerals refer to similar parts throughout the drawing.
The furnace to which the invention pertains, may comprise an elongated shell 1 closed at its ends as by the heads 2 of insulation material, a metal tube 3 extending centrally through the furnace and protruding from each end thereof, the space between vthe tube and shell being lled with suitable heat insulating material, such as kiesel- 'gphr or thelike, as indicated at 4.
- An electrode 5 may be provided upon each end` portion of the tube 3 in the form of a.
depending projection, to which thewires 6,
leading from the transformer 7 or other source of electric energy, are connected. A tank'8 containing a bath of lead or the like, as shown at 9,may be connected to the electrode 5 at the inlet end of the furnace, and a similar tank 8a containing a bath of lead or the like, as indicated at 9a, may be connected to the electrode at the discharge end of the furnace, and in order to hermetically vseal the tube 3 to prevent oxidation, the ends of the tube may be bent downward, as shown at l() and extended into the lead baths, effectually sealing the tube, although when it is not desirable or necessary to prevent oxidation, the tube may terminate at points spaced from the contacting devices.
It will be evident that the electric current thus passes not only throughA the tube 3, but also through the fluid conductor baths of lead. For the purpose of preheating the baths in t-he tanks when lead or other metals freezing at temperatures above normal are used, vin starting the furnace, any suitable form of auxiliary heater, such as shown at 11, may be provided, and the auxiliary heater at the entrance end of the furnace will be maintained throughout the operation, due to the chilling effect of the cold wire entering the bath.
A roller 12 is provided in the lower portion of each of the tanks, and in annealing the wire, indicated at 13, the same is progressively drawn from a reel 14 located near the tank 8, being passed downward through the molten bath of lead beneath the roller 12 and then through the tube 3 and into the bath of lead in the tank 8, under the roller 12 and wound upon a rcel 15.
It will be seen that the electric circuit passes entirely through the length of' sealed wire from one molten bath to the other, as
Well as entirely through the tulie, thereby maintaining equal electrical potential in and about or surrounding the wire, eliminating any arcs which might injure the Wire by contact of the Wire with the tube at any point, while oxidation of the wire is prevented by sealing the opposite ends of the tubes in the molten baths.
When the wire being treated is bright, a contacting device comprising a pairof ltension rollers or other tension device may be substituted for the fluid conductors which,
however, give better results when the wire is oxidized or corroded by reason of the larger contact surface afforded.
Due to the diiiiculty of constructing heat resisting alloy tubes of considerable length, it may be desirable to sometimes form the external heater for the wire of a sheetA formed into U-shape as shown at 3 in Fig. 2, t0 substantially surround the wire, brick or the like, as shown at 3b, being provided for closing the open side thereof.
1. A furnace for annealing or heat treating wire or the like, including a hermetically sealed tube, means for passing a Wire. through the tube, and means includingjluid,
conductors for passing an electric current through the wire and tube.
2. A furnace for annealing or heat treating wire or the like, including a tube, a fluid conductor at each end of the tube, means for passing a wire through the fluid conductors and tube, and means for passing an electric current through the` fluid conductors and tube. y
8. A furnace for annealing or heat treating wire or the like, including a tube, a'
tank in contact with each end of the tube, molten lead in said tanks, means for passing a Wire through the tanks and tube, and
means for passing an electric current FRANK T. COPE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US751025A US1704036A (en) | 1924-11-20 | 1924-11-20 | Annealing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US751025A US1704036A (en) | 1924-11-20 | 1924-11-20 | Annealing furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
US1704036A true US1704036A (en) | 1929-03-05 |
Family
ID=25020161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US751025A Expired - Lifetime US1704036A (en) | 1924-11-20 | 1924-11-20 | Annealing furnace |
Country Status (1)
Country | Link |
---|---|
US (1) | US1704036A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2417029A (en) * | 1944-05-22 | 1947-03-04 | Olin Ind Inc | Electric induction heating apparatus for continuously heating a plurality of metal strips |
US2427485A (en) * | 1943-08-21 | 1947-09-16 | Olin Ind Inc | Electric induction furnace for continuously heating metal strip |
US2513713A (en) * | 1947-11-24 | 1950-07-04 | Electric Furnace Co | Method of carburizing low carbon strip steel |
US2594876A (en) * | 1947-11-24 | 1952-04-29 | Electric Furnace Co | Apparatus for carburizing steel |
US3313597A (en) * | 1963-01-24 | 1967-04-11 | Union Carbide Corp | Method for continuous graphitization of carbonaceous thread |
US3499804A (en) * | 1966-11-07 | 1970-03-10 | Texas Instruments Inc | Heat treatment of clad wire or the like |
EP0057385A2 (en) * | 1981-02-02 | 1982-08-11 | VEB Draht- und Seilwerk Rothenburg | Method for the direct electrical resistance heating of metal workpieces |
-
1924
- 1924-11-20 US US751025A patent/US1704036A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2427485A (en) * | 1943-08-21 | 1947-09-16 | Olin Ind Inc | Electric induction furnace for continuously heating metal strip |
US2417029A (en) * | 1944-05-22 | 1947-03-04 | Olin Ind Inc | Electric induction heating apparatus for continuously heating a plurality of metal strips |
US2513713A (en) * | 1947-11-24 | 1950-07-04 | Electric Furnace Co | Method of carburizing low carbon strip steel |
US2594876A (en) * | 1947-11-24 | 1952-04-29 | Electric Furnace Co | Apparatus for carburizing steel |
US3313597A (en) * | 1963-01-24 | 1967-04-11 | Union Carbide Corp | Method for continuous graphitization of carbonaceous thread |
US3499804A (en) * | 1966-11-07 | 1970-03-10 | Texas Instruments Inc | Heat treatment of clad wire or the like |
EP0057385A2 (en) * | 1981-02-02 | 1982-08-11 | VEB Draht- und Seilwerk Rothenburg | Method for the direct electrical resistance heating of metal workpieces |
EP0057385B1 (en) * | 1981-02-02 | 1986-08-27 | VEB Draht- und Seilwerk Rothenburg | Method for the direct electrical resistance heating of metal workpieces |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US1704036A (en) | Annealing furnace | |
US1937420A (en) | Apparatus for heat treating wire | |
US2932502A (en) | Apparatus for continuous heat treating of wire | |
US1570815A (en) | Process and apparatus for insuring the straightness of metal tubes and strips of angle or other form during heat treatment | |
US1676685A (en) | Apparatus for the annealing of metals in continuous cold rolling | |
US2044763A (en) | Maintaining cable sheath | |
US2726971A (en) | Apparatus for drying and annealing wire | |
US2427485A (en) | Electric induction furnace for continuously heating metal strip | |
US1355521A (en) | Apparatus for tempering wire | |
US1386645A (en) | Electrically-heated strip and wire tempering and annealing device | |
DE970605C (en) | Method and device for the continuous annealing of metal strips and wires in the absence of air | |
US2176583A (en) | Annealing apparatus | |
US1495175A (en) | Apparatus for heat treating metal-coated materials | |
US1427753A (en) | Method of annealing metal | |
DE464830C (en) | Process for the operation of electric bright glow furnaces with uninterrupted operation in which the glow material and heating coil are surrounded by a protective gas | |
EP0006841A2 (en) | Apparatus for the continuous heat treatment of metal products | |
US1171832A (en) | Method of treating metals. | |
US2976397A (en) | Self-controlled strand annealer | |
US1881089A (en) | Metal coating apparatus | |
US2079494A (en) | Continuous annealing process | |
US1581380A (en) | Thermocouple casing | |
US1894825A (en) | Annealing process | |
DE1205572B (en) | Vacuum annealing tower with an annealing and a cooling section for continuous heat treatment of endless metal strips | |
GB1021565A (en) | Electric induction heating apparatus | |
US2047814A (en) | Method for treating metals |