EP0529198A2 - Four à atmosphère controlée, en particulier pour le préchauffage de matrices d'extrusion pour l'aluminium et ses alliages - Google Patents

Four à atmosphère controlée, en particulier pour le préchauffage de matrices d'extrusion pour l'aluminium et ses alliages Download PDF

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Publication number
EP0529198A2
EP0529198A2 EP92106486A EP92106486A EP0529198A2 EP 0529198 A2 EP0529198 A2 EP 0529198A2 EP 92106486 A EP92106486 A EP 92106486A EP 92106486 A EP92106486 A EP 92106486A EP 0529198 A2 EP0529198 A2 EP 0529198A2
Authority
EP
European Patent Office
Prior art keywords
chamber
door
furnace according
furnace
heating
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.)
Withdrawn
Application number
EP92106486A
Other languages
German (de)
English (en)
Other versions
EP0529198A3 (en
Inventor
Mario Pedersoli
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.)
CO M P ES SpA
Original Assignee
CO M P ES 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 CO M P ES SpA filed Critical CO M P ES SpA
Publication of EP0529198A2 publication Critical patent/EP0529198A2/fr
Publication of EP0529198A3 publication Critical patent/EP0529198A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
    • F27B17/0016—Chamber type furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating extruded work or parts of the extrusion press
    • B21C29/04—Cooling or heating extruded work or parts of the extrusion press of press heads, dies, or mandrels
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D5/00—Supports, screens or the like for the charge within the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F27D1/0009—Comprising ceramic fibre elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/125—Charging cars, lift trolleys
    • F27D2003/128—Charging cars, lift trolleys for carrying stacks of articles, e.g. bricks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1539—Metallic articles
    • F27M2001/1578—Articles of indefinite length
    • F27M2001/1582—Wires
    • F27M2001/1586—Wires in coil form

Definitions

  • the present invention relates to a controlled-atmosphere furnace, particularly for preheating extrusion dies for aluminum and alloys thereof.
  • the required preheating temperature which is usually comprised between 420 o and 480 o , is measured and controlled by means of a simple pyrometric device, usually constituted by a thermocouple inserted in said chamber, and preheating uniformity is obtained by means of a forced circulation of air, for example by means of a fan.
  • Said fan generally has a horizontal axis and is mounted on one of the sides of the furnace, i.e. of the chamber itself.
  • the lid furthermore does not maintain true tightness of the preheating chamber with respect to the external environment, so that there is a considerable replacement of the forced-circulation air inside said chamber, which is furthermore increased by the more or less frequent openings of said lid.
  • the dies are replaced according to preset times, which can vary within a range comprised between 30 minutes and 4 hours, thereby requiring openings of the chamber, in which seats are provided for a number of dies which is generally not smaller than twenty.
  • some dies for the different types of work can remain within the chamber even for several hours consecutively, since they are not used immediately.
  • the upper opening of the chambers is particularly dangerous for the personnel assigned to the extraction of the dies from said chamber, since whoever physically removes extrusion dies from the chamber of the furnace may be struck by blasts of heat, with the possibility of suffering from extremely severe burns.
  • the aim of the present invention is to eliminate or substantially reduce the problems described above in known types of preheating furnaces for extrusion dies by providing a controlled-atmosphere furnace particularly for preheating dies for extruding aluminum and alloys thereof which substantially limits the dispersion of heat toward the external environment, eliminating the complete opening of the furnace during the extraction of a die.
  • an object of the present invention is to provide a furnace in which the onerous phenomenon of the oxidation of the working surfaces of the dies is eliminated by allowing to work in environments having a controlled atmosphere.
  • Another object of the present invention is to provide a furnace which eliminates uncovering, i.e. the upward opening of the chamber, to thereby facilitate the operations for loading and removing dies and also to reduce the dispersion of heat into the external environment.
  • a further object of the present invention is to provide a furnace which allows a correct and precise control of its temperature, thus being able to rapidly adapt to the various contingent situations.
  • Not least object of the present invention is to provide a furnace which is relatively easy to manufacture and at competitive costs.
  • a controlled-atmosphere furnace particularly for preheating dies for extruding aluminum and alloys thereof according to the invention, characterized in that it comprises a supporting frame which delimits, at a portion of a side wall, at least one chamber which can be closed tight with respect to the outside environment, a door which can open outward being provided at said at least one chamber, said door having means for supporting a part to be preheated, and means for heating said at least one chamber.
  • the frame 1 is preferably but not necessarily constituted by an iron lattice which defines the frame on which panels 3 of thermally insulating closing material are applied; said panels define walls of said furnace.
  • the furnace comprises a plurality of chambers 2 which are arranged mutually side by side and are divided by the thermally insulating panels 3. The number of chambers 2 depends exclusively on the capabilities of said furnace.
  • a door 4 which can open outward is provided for each chamber 2 at side walls of the furnace, preferably but not necessarily at a front wall.
  • Each door 4 is provided with removable means for supporting a part to be preheated, and heating means are provided within each chamber 2.
  • Each door 4 is preferably but not necessarily made of stainless steel, is thermally insulated by means of appropriate panels and is provided with engagement means for the removable supporting means.
  • the supporting means are constituted by a framework 5 which can be removably applied to the inside of each door 4, as more clearly illustrated in figure 2, and has a configuration which corresponds to the shape of a part to be supported and preheated.
  • Said framework 5, which can be made for example of metallic tubular elements, has various dimensions and shapes according to the physical dimensions and geometric shapes of the dies.
  • Each door 4 is supported by a carriage 6 which can slide drawer-like with respect to guides which are constituted by a pair of members 7 for each chamber 2 which are arranged below each chamber, as more clearly illustrated in figure 1.
  • the carriage 4 is mounted so as to be able to slide within the respective guides, like a drawer, allowing to extract the door 4 and to extract the preheated part or die from the respective chamber without resorting to dangerous maneuvers such as those described above and also acting as protection for the personnel assigned to this operation.
  • Each door 4 furthermore has, at a flanged edge 8, a sealing gasket 9 which is arranged at a heat exchanger, constituted for example by a copper coil 10, which prevents the heating of the edge 8 and door 4.
  • the heating means advantageously comprise a plurality of resistors 10 which are preferably but not necessarily arranged on lateral walls and on the bottom of each of the chamber 2 and are easily and rapidly replaceable.
  • the space between each resistor 10 and the walls of the respective chamber 2 is furthermore reduced to a minimum in order to advantageously allow a more rapid heating of said chamber.
  • mutually independent pyrometric control means are furthermore provided in each of the chambers 2 and are constituted by pyrometers 11 which penetrate into each chamber.
  • the pyrometers 11 are furthermore connected independently to temperature control means, of a perse known type, which are in turn connected to the heating means in order to independently control the temperature of the various chambers according to the different preheating temperatures of the dies, depending on the different productions in which they are used.
  • Each chamber 2 is furthermore provided with a duct 12 which leads into it and can be selectively connected to a source of vacuum, such as for example a pump, and to a unit for introducing a controlled inert atmosphere, which is constituted for example by a tank of treatment gas.
  • a source of vacuum such as for example a pump
  • a unit for introducing a controlled inert atmosphere which is constituted for example by a tank of treatment gas.
  • an electric valve connects the duct 12 to the tank of the treatment gas, which is usually of the inert type and thus contains no oxygen or water vapor and thus prevents the oxidation of the working surfaces of the openings of the die.
  • oxidizing gases such as oxygen conveniently allows the permanence of the dies in the respective chambers even for very long times without thereby leading to the forming of oxide on its working surfaces.
  • the drawer-like opening of the door 4 considerably reduces heat dispersion toward the outside environment, furthermore allowing the assigned personnel to rapidly engage the die supported in the framework 5, thus reducing the time for which said chamber is open and consequently reducing the dangers of exposure of the personnel to blasts of heat arriving from the chambers.
  • the furnace according to the invention furthermore allows a precise and controlled adjustment of the temperature of each individual preheating chamber, allowing a better choice of the preheating temperature for each die.
  • each chamber is sealed tight with respect to the outside and that it is thus possible to advantageously provide a precise and constant control of the atmosphere in which the die or part being preheated is immersed, eliminating a severe productive risk factor such as oxidation of the working surfaces of each individual extrusion die, is furthermore fundamentally important.
  • the materials employed, as well as the dimensions, may be any according to the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
EP19920106486 1991-04-30 1992-04-15 Controlled-atmosphere furnace, particularly for preheating extrusion dies for aluminum and alloys thereof Withdrawn EP0529198A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911176 1991-04-30
ITMI911176A IT1247439B (it) 1991-04-30 1991-04-30 Forno ad atmosfera controllata particolarmente per il preriscaldamento di matrici di estrusione di alluminio e sue leghe

Publications (2)

Publication Number Publication Date
EP0529198A2 true EP0529198A2 (fr) 1993-03-03
EP0529198A3 EP0529198A3 (en) 1993-06-16

Family

ID=11359803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920106486 Withdrawn EP0529198A3 (en) 1991-04-30 1992-04-15 Controlled-atmosphere furnace, particularly for preheating extrusion dies for aluminum and alloys thereof

Country Status (2)

Country Link
EP (1) EP0529198A3 (fr)
IT (1) IT1247439B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657709A1 (fr) * 1993-12-07 1995-06-14 Klaus Dipl.-Ing. Strobel Procédé pour la cuisson de tubes et dispositif à cet effet
EP1627696A1 (fr) * 2004-08-05 2006-02-22 Schwartz, Eva Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion
US7393205B2 (en) 2005-11-04 2008-07-01 Eva Schwartz Device and method for heating up extrusion dies prior to their installation in an extruder
CN102364279A (zh) * 2011-10-26 2012-02-29 南京长江工业炉科技有限公司 一种多室模具预热炉
WO2013078552A1 (fr) * 2011-12-02 2013-06-06 Exco Technologies Limited Système de préchauffage de filière d'extrudeuse, appareil et procédé
WO2013188961A1 (fr) * 2012-06-21 2013-12-27 Exco Technologies Limited Dispositif et procédé de préchauffage de filière d'extrusion
CN108716853A (zh) * 2018-05-29 2018-10-30 叶泽龙 一种自动开合的箱式电阻炉门体结构
CN109570431A (zh) * 2018-12-17 2019-04-05 南京迪威尔高端制造股份有限公司 多向双动挤压液压机的重型模具预热炉底及模具装卸方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036885C2 (de) * 1970-07-24 1983-01-13 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Back- und Bratrohr
US4580973A (en) * 1984-07-09 1986-04-08 Ronald R. Yamada Kiln with improved heat distribution
FR2617582B1 (fr) * 1987-07-01 1990-03-09 Cavallera Claude Four de sechage et de cuisson de produits refractaires

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657709A1 (fr) * 1993-12-07 1995-06-14 Klaus Dipl.-Ing. Strobel Procédé pour la cuisson de tubes et dispositif à cet effet
EP1627696A1 (fr) * 2004-08-05 2006-02-22 Schwartz, Eva Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion
DE102004038247B3 (de) * 2004-08-05 2006-05-11 Schwartz, Eva Vorrichtung und Verfahren zur Erwärmung von Strangpresswerkzeugen vor dem Einbau in eine Strangpresse
US7393205B2 (en) 2005-11-04 2008-07-01 Eva Schwartz Device and method for heating up extrusion dies prior to their installation in an extruder
CN102364279A (zh) * 2011-10-26 2012-02-29 南京长江工业炉科技有限公司 一种多室模具预热炉
EP2785506A4 (fr) * 2011-12-02 2015-07-22 Exco Technologies Ltd Système de préchauffage de filière d'extrudeuse, appareil et procédé
WO2013078552A1 (fr) * 2011-12-02 2013-06-06 Exco Technologies Limited Système de préchauffage de filière d'extrudeuse, appareil et procédé
US9346210B2 (en) 2011-12-02 2016-05-24 Exco Technologies Limited Extrusion die pre-heating system, apparatus and method
WO2013188961A1 (fr) * 2012-06-21 2013-12-27 Exco Technologies Limited Dispositif et procédé de préchauffage de filière d'extrusion
CN104520027A (zh) * 2012-06-21 2015-04-15 埃克斯科科技有限公司 挤出模具预热装置和方法
EP2864066A4 (fr) * 2012-06-21 2016-02-24 Exco Technologies Ltd Dispositif et procédé de préchauffage de filière d'extrusion
CN104520027B (zh) * 2012-06-21 2016-10-12 埃克斯科科技有限公司 挤出模具预热装置和方法
RU2637731C2 (ru) * 2012-06-21 2017-12-06 Экско Текнолоджиз Лимитед Устройство и способ предварительного нагрева экструзионной матрицы
US9975275B2 (en) 2012-06-21 2018-05-22 Exco Technologies Limited Extrusion die pre-heating device and method
CN108716853A (zh) * 2018-05-29 2018-10-30 叶泽龙 一种自动开合的箱式电阻炉门体结构
CN109570431A (zh) * 2018-12-17 2019-04-05 南京迪威尔高端制造股份有限公司 多向双动挤压液压机的重型模具预热炉底及模具装卸方法
CN109570431B (zh) * 2018-12-17 2023-10-31 南京迪威尔高端制造股份有限公司 多向双动挤压液压机的重型模具预热炉底及模具装卸方法

Also Published As

Publication number Publication date
EP0529198A3 (en) 1993-06-16
ITMI911176A1 (it) 1992-10-30
IT1247439B (it) 1994-12-14
ITMI911176A0 (it) 1991-04-30

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