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
  • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
  • C21D1/613—Gases; Liquefied or solidified normally gaseous material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
• • 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
  • C21D9/573—Continuous furnaces for strip or wire with cooling
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

• the invention relates to a method for controlled cooling in one Continuous-flow annealing furnace or strip heated to solution annealing temperature one heated to solution annealing temperature during extrusion Aluminum alloy profile immediately after the tape emerges from the continuous annealing furnace or the profile from the die of an extrusion press, the band or profile by directly applying its Surface is cooled with a cooling medium.
• EP-A-0343103 describes a method for cooling pressed profiles and Rolling strips are known in which a water mist is generated by means of spray nozzles becomes. This known cooling method using spray nozzles is in EP-A-0429394 described for cooling cast metal strands.
• EP-A-0578607 describes an inline method for cooling from a Extruded extruded profiles disclosed, in which the from EP-A-0343103 known spray nozzles are installed in modules.
• EP-A-0695590 describes a method and a device for cooling known from hot-rolled plates and strips made of an aluminum alloy, being cut plates or strips continuously a cooling station run through and directly charged with water via flat jet nozzles become. Immediately after it exits the flat fan nozzle the water jet periodically by means of air or water jets distracted that the water jet hitting the plate or belt surface performs a wiping motion. With the use of flat jet nozzles arises when the water jet hits the plate or belt surface a narrow impact surface with high heat transfer. This locally high heat transfer together with the wiping movement leads to a even heat removal.
• the invention is therefore based on the object of a method of the beginning to create the type mentioned, with which in a simple manner an over the entire Strip or profile surface with locally independent cooling gradient sufficient cooling rate can be set at the same time can.
• a cooling medium is used Gas or gas mixture with a boiling point of max. -150 ° C in liquid form is sprayed evenly onto the belt or profile surface.
• liquid gas as a coolant compared to water Another advantage of a liquid gas as a coolant compared to water is that the liquid gas medium is easier to control.
• the negative Tendency of water after hitting the strip or profile surface to flow back into the furnace or into the die and there explosive Evaporation can occur when using LPG as the cooling medium be avoided.
• the cooling capacity can be optimized control what is producing accurate and reproducible cooling conditions enables.
• For even distribution of the liquid gas on the belt or Profile surface can basically be the well-known for cooling Water nozzle systems are used.
• Liquid nitrogen is used as the preferred cooling medium.
• the delivery rate of the cooling medium is expediently set so that the cooling medium hitting the strip or profile surface is complete evaporates.
• the complete evaporation prevents the formation of heat inhibiting liquid gas film.
• the inventive Cooling with liquefied gas offers here compared to the usual Water cooling processes have the decisive advantage that faults the band or the profile can be prevented without special measures can. In the less critical temperature range below about 250 ° C can be switched to conventional in a stage following the liquid gas cooling Be further cooled with water or air.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8236032

Family Applications (1)

Country Status (1)

Cited By (3)

Citations (7)

• 1998
  • 1998-04-09 EP EP98810309A patent/EP0949348A1/fr not_active Withdrawn

Patent Citations (7)

Non-Patent Citations (3)

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