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WO2008041117A1 - Ensemble de trempe à haute vitesse pour produits métalliques - Google Patents

Ensemble de trempe à haute vitesse pour produits métalliques Download PDF

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Publication number
WO2008041117A1
WO2008041117A1 PCT/IB2007/002972 IB2007002972W WO2008041117A1 WO 2008041117 A1 WO2008041117 A1 WO 2008041117A1 IB 2007002972 W IB2007002972 W IB 2007002972W WO 2008041117 A1 WO2008041117 A1 WO 2008041117A1
Authority
WO
WIPO (PCT)
Prior art keywords
quenching
designed
heat exchanger
cooling liquid
air
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.)
Ceased
Application number
PCT/IB2007/002972
Other languages
English (en)
Inventor
Tullio Caselli
Alberto Pedrazzini
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.)
SHAP SOLAR HEAT AND POWER SpA
Original Assignee
SHAP SOLAR HEAT AND POWER SpA
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.)
Filing date
Publication date
Application filed by SHAP SOLAR HEAT AND POWER SpA filed Critical SHAP SOLAR HEAT AND POWER SpA
Publication of WO2008041117A1 publication Critical patent/WO2008041117A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C21D1/62—Quenching devices
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C21D1/64—Quenching devices for bath quenching with circulating liquids
    • 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 present invention relates to a high speed quenching assembly for metal products.
  • the present invention regards high speed quenching of aluminium products , to which the ensuing description will make explicit reference, without this implying any loss in generality.
  • An adequate design and provision of the quenching step enables production of elements with minimal residual stresses and small deformations.
  • quenching is carried out by means of immersion of the blocks in a liquid, typically water, or through blowing of a current of air (air quenching) at room temperature.
  • the quenching step is always preceded by a step of heating in a furnace, in which the blocks are brought to a high temperature (>500°C) , and by a subsequent step of thermal ageing, which operates at medium temperatures (25O 0 C) .
  • the aim of the present invention is to provide a high speed quenching assembly for metal products that will present higher efficiency and lower expenditure of energy as compared to techniques of the known art.
  • the subject of the present invention is a high speed quenching assembly for metal products , characterized in that it comprises: an absorption chiller device, designed to be supplied by fumes coming from processing of said metal products and to cool a cooling liquid; a heat exchanger, designed to cool a current of air by means of said cooling liquid; conduction means, designed to convey said cooling liquid from said absorption chiller to said heat exchanger; a quenching chamber, designed to house the metal products to be cooled; and further conduction means, designed to convey cooled air from said heat exchanger to said quenching chamber.
  • the assembly forming the subject of the present invention comprises means for distribution of the cooled air into said quenching chamber.
  • the distribution means comprise a fan and a plurality of nozzles facing directly inside said quenching chamber.
  • the assembly forming the subject of the present invention comprises a tank for the cooling liquid, designed to receive the cooling liquid coming from the absorption chiller and to supply the cooling liquid to the heat exchanger.
  • Figure 1 is a schematic illustration of the assembly forming the subject of the present invention,- and
  • Figure 2 is a graph which represents the surface of the heat exchanger as a function of the temperature of the air at output from the quenching chamber .
  • Figure 1 designated as a . whole by 1 is the quenching assembly forming the subject of the present invention.
  • the assembly 1 comprises a quenching chamber 2, a cooled water/undercooled air heat exchanger 3 , a tank 4 of cooled water, an absorption chiller 5, which uses as heat supply the exhaust fumes coming from furnaces in which the blocks of aluminium are brought to a temperature higher than 500 0 C, and a fan 6.
  • the absorption chiller 5 supplies refrigerating energy using thermal energy instead of mechanical energy.
  • an absorber, a generator, a pump, and a restriction device are used instead of an electrical compressor.
  • a double acting absorption chiller is employed, which uses the hot fumes coming from the thermal treatments of aluminium that precede the quenching step, and uses this energy for undercooling to 7 0 C the water, which is then stored in the tank 4.
  • Sizing of the chiller 5 is ' determined as a function of the refrigerating energy to be supplied to the flow of water- processed. ⁇ •
  • the heat exchanger 3 has the function of undercooling a current of dried external air having a flowrate that depends upon the quenching chamber 2.
  • the flow of air entering the heat exchanger 3 is dehumidified by means of purposely provided dehumidification devices (known and not described in detail) , supplied by the heat of the fumes coming from processing and from the absorption chiller 5.
  • the heat exchanger 3 is activated each hour only in the minutes in which the process of high speed quenching with undercooled water at 7 0 C coming from the tank 4 is required.
  • the choice of the type and sizing of the heat exchanger 3 is made according to the flowrates and conditions of the two fluids, air and water, at input and at output in the operating conditions as represented in the graph of Figure 2.
  • the tank 4 for the undercooled water has the task of accumulating the volume of water necessary for heat exchange with the air in the minutes during which the quenching step is active. Its sizing is a function of the minimum volume of water .
  • the fan 6 has the purpose of blowing the cooling air into the quenching chamber 2 in order to optimize the power, expressed in kcal/h m 2 0 C 7 for removal of the heat from the blocks of aluminium.
  • the fan 6 is purposely designed for the specific pieces that are to be treated. Sizing of the fan is then carried out according to the required -flowrate of air, with a pressure gradient necessary to bestow upon the air the right kinetic energy downstream of nozzles that directly face the inside of the quenching chamber 2.
  • the process is a continuous process in which the absorption chiller 5 operates continuously and sends cold water to the tank 4.
  • the assembly 1 comprises a system for recirculation of cooling water from the absorption chiller 5 to the heat exchanger 3 .
  • the cold water is sent to the air/water heat exchanger 3 where the external air is undercooled so as to be sent into the quenching chamber 2.
  • the blocks of aluminium After the blocks of aluminium have been in the solution furnace, they are sent into the quenching chamber 2, where within a few minutes their temperature is decreased through an appropriate -exchange with the flow of undercooled air at 10 0 C.
  • the thermal power subtracted from the blocks and the necessary- flow of air are calculated as a function of the size of the blocks and the fluid-dynamic path designed for the chamber.
  • the assembly 1 is designed for supplying the correct amount of undercooled air such as to carry out cooling of the blocks of aluminium from 550 0 C to 100 0 C with a cooling rate of 70°C/min.
  • the assembly can be sized as a function of the mass of aluminium to be cooled and the amount of air to be blown.
  • the assembly according to the present invention envisages continuous production of cooled water with the absorption chiller 5 and subsequent storage thereof in a tank 4.
  • the heat exchanger 3 is activated, where the thermal exchange between the water stored in the tank 4 and the air coming from the environment and previously dried occurs .
  • the distribution of the air in the quenching chamber 2 is carried out by a purposely provided fan 6 and by a plurality of nozzles that face the inside of the quenching chamber 2.
  • the main advantages afforded by the assembly of the present invention derive from the use of air undercooled at a high rate produced by action of an absorption chiller, which carries out recovery of heat from the fumes deriving from the thermal treatments that precede the quenching step.

Landscapes

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

Abstract

L'invention concerne un ensemble (1) de trempe à haute vitesse pour produits métalliques, qui comprend: un refroidisseur à absorption (5) conçu pour être alimenté en fumées provenant du traitement des produits métalliques proprement dits et pour refroidir un liquide de refroidissement, un échangeur de chaleur (3) conçu pour refroidir un écoulement d'air à l'aide d'un liquide de refroidissement, des moyens de conduit conçus pour transporter le liquide de refroidissement depuis le refroidisseur à absorption (5) jusqu'à l'échangeur de chaleur (3), une chambre de trempe (2) conçue pour loger les produits métalliques à tremper et d'autres moyens de conduit conçus pour transporter l'air refroidi entre l'échangeur de chaleur (3) et la chambre de trempe (1).
PCT/IB2007/002972 2006-10-06 2007-10-05 Ensemble de trempe à haute vitesse pour produits métalliques Ceased WO2008041117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2006A000535 2006-10-06
ITRM20060535 ITRM20060535A1 (it) 2006-10-06 2006-10-06 High speed undercooled air quenching con recuperi termici

Publications (1)

Publication Number Publication Date
WO2008041117A1 true WO2008041117A1 (fr) 2008-04-10

Family

ID=38969456

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/002972 Ceased WO2008041117A1 (fr) 2006-10-06 2007-10-05 Ensemble de trempe à haute vitesse pour produits métalliques

Country Status (2)

Country Link
IT (1) ITRM20060535A1 (fr)
WO (1) WO2008041117A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623559A1 (de) * 1996-06-13 1997-12-18 Werner Hermann Wera Werke Vorrichtung und Verfahren zum Härten von metallischen Werkstücken
WO2005123970A1 (fr) * 2004-06-15 2005-12-29 Narasimhan Gopinath Procédé et dispositif pour le durcissement de pièces métalliques

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623559A1 (de) * 1996-06-13 1997-12-18 Werner Hermann Wera Werke Vorrichtung und Verfahren zum Härten von metallischen Werkstücken
WO2005123970A1 (fr) * 2004-06-15 2005-12-29 Narasimhan Gopinath Procédé et dispositif pour le durcissement de pièces métalliques

Also Published As

Publication number Publication date
ITRM20060535A1 (it) 2008-04-07

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