US2177031A - Continuous heat treatment furance - Google Patents
Continuous heat treatment furance Download PDFInfo
- Publication number
- US2177031A US2177031A US265504A US26550439A US2177031A US 2177031 A US2177031 A US 2177031A US 265504 A US265504 A US 265504A US 26550439 A US26550439 A US 26550439A US 2177031 A US2177031 A US 2177031A
- Authority
- US
- United States
- Prior art keywords
- temperature
- heat treatment
- grease
- oil
- chamber
- 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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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S82/00—Turning
- Y10S82/90—Lathe thermal regulation
Definitions
- This invention is concerned with improvements in or relating to continuous heat treatment furnaces, and is particularly concerned with furnaces for the bright annealing of tubes and other ar- 5 ticles, which, prior to annealing, are produced by rolling, drawing, pressing, or other methods involving the use of oil or grease. If the articles coated with such oil or grease are subjected to an annealing treatment in .a furnace, the oil or grease volatilises at the volatilisation temperature of the hydrocarbon, and the vapours produced decompose at the cracking temperature which is below the annealing temperature, with the result that carbon is deposited on the articles.
- the principal object of the present invention is to provide an improved and simple construction of furnace which will avoid the deposition of carbon on the work, without resorting to chemical degreasing processes.
- the furnace is provided with an inlet chamber maintained at a substantially constant temperature between the volatilisation temperature and the cracking temperature, so that the vapours produced by the volatilisation of the oil or grease can be removed before the work attains the temperature at which cracking takes place.
- the vapours are removed before the introduction of the work into the treatment chamber, in which the higher annealing temperature would otherwise cause cracking of the vapours, and the deposition of carbon on the articles.
- the vapours may be removed 40 from the inlet or preheating chamber by a stream of reducing or non-oxidising gas flowing from the heat treatment chamber.
- a cooling chamber may be interposed between the inlet chamber and the treatment chamber to ensure that the stream of gases flowing from the latter enters the inlet chamber at a temperature below the cracking temperature of the vapours.
- the work, coated with oil or grease is introduced into an inlet chamber a. and is annealed during its passage through a heat treatment chamber b, being finally discharged from the cooling or outlet chamber 0.
- the inlet chamber is preferably of greater length than is usual in continuous annealing furnaces 5 and comprises a temperature controlled zone (12 disposed between a cooling jacket e and an entry portion i for the work.
- the zone d is heated by appropriate auxiliary means, the temperature being controlled, for example, by pyrometers, and is 10 of such length that the work is maintained between the volatilisation temperature, and the cracking temperature of the oil or grease.
- the whole of the grease will thus be heated to above its volatilising temperature, while the vapours 15 thus produced will not be decomposed since the temperature remains below the cracking temperature.
- the grease or oil is removed from the work before its introduction into the treatment chamber.
- the flow of protective non-oxidising gas from the treatment chamber is utilized for entraining the vapours and discharging them through an outlet g on the entry portion 1.
- the discharge may take place into the atmosphere, or outlets g at the ends of the furnace may be connected in a circulating system including a pump h for returning the non-oxidising gas to the treatment chamber after the vapours have been removed in a condenser or oil filter i, a burner apparatus :i 0 being provided for removing oxygen from air admitted through the furnace ends.
- the provision of the cooling jacket e ensures that the non-oxidising gas entering the chamber d from the annealing chamber b is below the temperature of decomposition of the volatilised oil or grease.
- the heat treatment in the heat treatment chamber of a continuous furnace of articles con- 0 taminated with oil or grease comprising preheating the articles in an inlet chamber, maintaining the temperature in said inlet chamber at a substantially constant temperature between the volatilisation and cracking temperatures of the oil or grease, entraining the vapours produced by the volatilisation of the oil or grease in a. stream of a protective gas outfiowing from the treatment chamber, and cooling the protective gas between the treatment chamber and the inlet chamber to reduce its temperature below the cracking temperature of the said vapours.
- the heat treatment in the heat treatment chamber of a continuous furnace of articles contaminated with oil or grease comprising preheat- 55 ing the articles in an inlet chamber, maintaining the temperature in said inlet chamber at a substantially constant temperature between the volatilisation and. cracking temperatures of the oil or grease, entraining the vapours produced by the volatilisation of the oil or grease in a stream of a protective gas outflowing from the treatment chamber, and discharging the gases and vapours from the inlet chamber, removing the oil or grease, and returning the purified protective gas to the treatment chamber.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
Oct. 24, 1939. TANNER 2,177,035
CONTINUOUS HEAT TREATMENT FURNACE Filed April 1, 1959 i z, j
;L .J L l 4 f c f d e 5 I ATTZEIiYS Patented Oct. 24, 1939 UNITED STATES PATENT OFFICE Application April 1, 1939, .Serial No. 265,504 In Great Britain April 1, 1938 2 Claims.
This invention is concerned with improvements in or relating to continuous heat treatment furnaces, and is particularly concerned with furnaces for the bright annealing of tubes and other ar- 5 ticles, which, prior to annealing, are produced by rolling, drawing, pressing, or other methods involving the use of oil or grease. If the articles coated with such oil or grease are subjected to an annealing treatment in .a furnace, the oil or grease volatilises at the volatilisation temperature of the hydrocarbon, and the vapours produced decompose at the cracking temperature which is below the annealing temperature, with the result that carbon is deposited on the articles.
With the object of overcoming this disadvantage, it has been proposed to subject the articles to a chemical degreasing treatment prior to the commencement of the heat treatment in the furnace. Such a process, however, is not only inconvenient, but also materially increases costs of production.
The principal object of the present invention is to provide an improved and simple construction of furnace which will avoid the deposition of carbon on the work, without resorting to chemical degreasing processes.
According to this invention, the furnace is provided with an inlet chamber maintained at a substantially constant temperature between the volatilisation temperature and the cracking temperature, so that the vapours produced by the volatilisation of the oil or grease can be removed before the work attains the temperature at which cracking takes place. Thus the vapours are removed before the introduction of the work into the treatment chamber, in which the higher annealing temperature would otherwise cause cracking of the vapours, and the deposition of carbon on the articles. The vapours may be removed 40 from the inlet or preheating chamber by a stream of reducing or non-oxidising gas flowing from the heat treatment chamber. A cooling chamber may be interposed between the inlet chamber and the treatment chamber to ensure that the stream of gases flowing from the latter enters the inlet chamber at a temperature below the cracking temperature of the vapours.
In order to enable the invention to be readily understood, reference will now be made to the accompanying drawing in which the figure is a side elevation illustrating diagrammatically one example of construction for carrying the invention into effect.
Referring to the drawing, the work, coated with oil or grease, is introduced into an inlet chamber a. and is annealed during its passage through a heat treatment chamber b, being finally discharged from the cooling or outlet chamber 0. The inlet chamber is preferably of greater length than is usual in continuous annealing furnaces 5 and comprises a temperature controlled zone (12 disposed between a cooling jacket e and an entry portion i for the work. The zone d is heated by appropriate auxiliary means, the temperature being controlled, for example, by pyrometers, and is 10 of such length that the work is maintained between the volatilisation temperature, and the cracking temperature of the oil or grease. The whole of the grease will thus be heated to above its volatilising temperature, while the vapours 15 thus produced will not be decomposed since the temperature remains below the cracking temperature. Thus the grease or oil is removed from the work before its introduction into the treatment chamber.
The flow of protective non-oxidising gas from the treatment chamber is utilized for entraining the vapours and discharging them through an outlet g on the entry portion 1. The discharge may take place into the atmosphere, or outlets g at the ends of the furnace may be connected in a circulating system including a pump h for returning the non-oxidising gas to the treatment chamber after the vapours have been removed in a condenser or oil filter i, a burner apparatus :i 0 being provided for removing oxygen from air admitted through the furnace ends. The provision of the cooling jacket e ensures that the non-oxidising gas entering the chamber d from the annealing chamber b is below the temperature of decomposition of the volatilised oil or grease.
Having described my invention what I claim and desire to secure by Letters Patent is:
1. The heat treatment in the heat treatment chamber of a continuous furnace of articles con- 0 taminated with oil or grease, comprising preheating the articles in an inlet chamber, maintaining the temperature in said inlet chamber at a substantially constant temperature between the volatilisation and cracking temperatures of the oil or grease, entraining the vapours produced by the volatilisation of the oil or grease in a. stream of a protective gas outfiowing from the treatment chamber, and cooling the protective gas between the treatment chamber and the inlet chamber to reduce its temperature below the cracking temperature of the said vapours.
2. The heat treatment in the heat treatment chamber of a continuous furnace of articles contaminated with oil or grease, comprising preheat- 55 ing the articles in an inlet chamber, maintaining the temperature in said inlet chamber at a substantially constant temperature between the volatilisation and. cracking temperatures of the oil or grease, entraining the vapours produced by the volatilisation of the oil or grease in a stream of a protective gas outflowing from the treatment chamber, and discharging the gases and vapours from the inlet chamber, removing the oil or grease, and returning the purified protective gas to the treatment chamber.
THQMAS GORDON TANNER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2177031X | 1938-04-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2177031A true US2177031A (en) | 1939-10-24 |
Family
ID=10900460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US265504A Expired - Lifetime US2177031A (en) | 1938-04-01 | 1939-04-01 | Continuous heat treatment furance |
Country Status (1)
Country | Link |
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US (1) | US2177031A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2971871A (en) * | 1958-01-29 | 1961-02-14 | Midland Ross Corp | Annealing furnace seal |
US3531333A (en) * | 1968-06-24 | 1970-09-29 | Wilson Lee Eng Co Inc | Method of heat treating steel strip or the like |
US10531679B2 (en) * | 2013-07-16 | 2020-01-14 | Evonik Degussa, GmbH | Method for drying biomass |
US10619175B2 (en) | 2014-10-02 | 2020-04-14 | Evonik Operations Gmbh | Process for producing a PUFA-containing feedstuff by extruding a PUFA-containing biomass |
US10842174B2 (en) | 2014-10-02 | 2020-11-24 | Evonik Operations Gmbh | Method for producing biomass which has a high exopolysaccharide content |
US11324234B2 (en) | 2014-10-02 | 2022-05-10 | Evonik Operations Gmbh | Method for raising animals |
US11464244B2 (en) | 2014-10-02 | 2022-10-11 | Evonik Operations Gmbh | Feedstuff of high abrasion resistance and good stability in water, containing PUFAs |
-
1939
- 1939-04-01 US US265504A patent/US2177031A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2971871A (en) * | 1958-01-29 | 1961-02-14 | Midland Ross Corp | Annealing furnace seal |
US3531333A (en) * | 1968-06-24 | 1970-09-29 | Wilson Lee Eng Co Inc | Method of heat treating steel strip or the like |
US10531679B2 (en) * | 2013-07-16 | 2020-01-14 | Evonik Degussa, GmbH | Method for drying biomass |
US10619175B2 (en) | 2014-10-02 | 2020-04-14 | Evonik Operations Gmbh | Process for producing a PUFA-containing feedstuff by extruding a PUFA-containing biomass |
US10842174B2 (en) | 2014-10-02 | 2020-11-24 | Evonik Operations Gmbh | Method for producing biomass which has a high exopolysaccharide content |
US11324234B2 (en) | 2014-10-02 | 2022-05-10 | Evonik Operations Gmbh | Method for raising animals |
US11464244B2 (en) | 2014-10-02 | 2022-10-11 | Evonik Operations Gmbh | Feedstuff of high abrasion resistance and good stability in water, containing PUFAs |
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