EP1627696A1 - Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion - Google Patents

Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion Download PDF

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Publication number
EP1627696A1
EP1627696A1 EP05015970A EP05015970A EP1627696A1 EP 1627696 A1 EP1627696 A1 EP 1627696A1 EP 05015970 A EP05015970 A EP 05015970A EP 05015970 A EP05015970 A EP 05015970A EP 1627696 A1 EP1627696 A1 EP 1627696A1
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EP
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Prior art keywords
tools
heating
temperature
heated
fluid
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Granted
Application number
EP05015970A
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German (de)
English (en)
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EP1627696B1 (fr
Inventor
Rolf-Josef Schwartz
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Classifications

    • 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
    • B21C29/04—Cooling or heating of press heads, dies or mandrels

Definitions

  • the invention relates to a device for heating extrusion tools prior to installation in an extruder in which the tools are heated to a predetermined temperature and held on this.
  • the invention further relates to a method for heating extrusion dies prior to installation in an extruder.
  • the device and the method are particularly suitable for heating and keeping warm steel tools for extruding aluminum, non-ferrous metal and similar alloys.
  • the heating of the tools to a predetermined temperature is conventionally carried out with the aid of a radiation or convection oven.
  • This chamber or chest oven are used, in each of which one or more tools are.
  • the heating of the furnaces is usually done with electrical resistors, by gas flames or by a combination of these heaters.
  • the heating of the tools takes place only slowly, since the heat transfer coefficient is comparatively low.
  • radiant heating the problem of overheating filigree elements of the tool often arises because radiant heaters have a typical temperature of about 800 ° C. and thereby generate undesirable temperature gradients in the tool.
  • the technique of magnetic field heating is used, which also has the disadvantage of difficult temperature distribution.
  • the magnetic field heating does not allow the use of protective or reaction gas and the technology requires high acquisition costs.
  • Multiple tool ovens are common Furthermore, that cold tools are used in addition to füricarmte and then cool on filigree elements inadmissible. This can lead to tool breakage during pressing, which also causes high costs.
  • the object of the invention is to provide a device for heating and keeping warm tools for the extrusion of materials, which avoids the disadvantages of known ovens.
  • the device should realize a high heat transfer coefficient, allow a uniform heating of the tools and thereby take up little space.
  • the object of the invention is also to provide a method for heating tools for extruding materials, in which the materials are heated as quickly and uniformly, the process requires little energy and the chemical properties of the tool steel are as little as possible negatively changed ,
  • the device according to the invention for heating extruding tools prior to installation in an extruder, in which the tools are heated to a predetermined temperature and held on this comprises a gas-tight and thermally insulated oven housing, which at least one loading and unloading opening with a furnace lid demonstration.
  • a baffle nozzle field is arranged, in the region of which a tool can be introduced.
  • the apparatus is further provided with at least one heater which heats a fluid flowing through the openings of the baffle pad.
  • the device is preferably operated with protective or reaction gas. This gas atmosphere inside the system is intended to protect against oxidation or other undesirable chemical influences. For example, it prevents the degradation of the nitriding layer.
  • the device has at least one fan for circulating the fluid through the heating device and the baffle nozzle field.
  • the fans can accelerate the fluid used, for example, to nozzle exit speeds of about 20-100 m / s.
  • the supply of the fluid to the tools takes place in a particularly preferred embodiment of the invention by means of nozzles, through which the flow direction and speed of the fluid can be designed so that when hitting the tool a maximum heat transfer performance is realized.
  • the impact rays preferably impinge on the tools perpendicularly or at an angle of 80 ° to 100 ° to the surface.
  • the invention further includes a method of heating extrusion dies prior to installation in the extrusion press, wherein the dies are heated to and maintained at a predetermined temperature.
  • the tools are introduced into a device which has a baffle pad in which the tools are heated at least to the predetermined temperature. After heating, the tool is placed in a press.
  • the fluid used is preferably heated by heaters and flows through one or more fans through nozzle openings on one or more tools.
  • in each case only one tool is introduced into the device, heated therein and kept at a predetermined temperature.
  • the invention turns away from single or multi-tool ovens with convection or radiation heating and instead uses a nozzle array with impact jets, which brings very good conditions for the relevant temperature range.
  • a blast furnace brings various advantages.
  • the impact beam heating is not critical with respect to excess temperatures with the consequence of large temperature gradients.
  • the heating with impact rays is easy to carry out and has been tested in their handling. In addition, it represents a cost-effective heating technique.
  • the most important advantage of a blast furnace is the very good and even heat transfer between the nozzle field and tool, which is realized by the highly turbulent contact between the tool surface and impact fluid. Heat transfer rates of up to 150 W / m 2 h can be achieved with this type of heating compared to about 50 W / m 2 h in normal convection or radiation.
  • the device according to the invention is designed as a chest oven, in which in each case only one extrusion die is introduced, the dimensions can be kept small. Furthermore, the heating of the tools is not affected by cold tools in the vicinity of already heated tools. Even chemical changes during the sometimes very long holding phases of a tool in a heating furnace can be largely avoided by the inventive design of a device with a baffle pad.
  • FIG. 1 In the apparatus shown in Figures 1 and 2 is an oven hearth 10 with various structural features, in Fig. 1, the device is shown in a side cross-section, while Fig. 2 shows a plan view of the device.
  • the arrows represent the direction of flow of the fluid within the device.
  • the white arrows indicate the direction of flow within the pressure chamber of the device and the black arrows indicate the direction of flow of the fluid in the impact nozzle field.
  • the tools 90 to be heated in the apparatus are extrusion dies which often consist of several round steel plates with holes and engravings. Such a tool is shown by way of example in FIG. 1 as a round plate 90. Through such steel plates materials are pressed to obtain a specific profile. In addition to various plastics, aluminum, non-ferrous metals or similar alloys can also be pressed by a tool. However, other shaped tools can be heated for subsequent installation in a press.
  • the plant and the heating method are particularly suitable for heating extrusion tools, which consist of high-strength steels.
  • the furnace hearth 10 provides a gas-tight and heat-insulated furnace housing 50 into which the tools 90 can be introduced through one or more charging and removal openings 70.
  • the tools are subsequently heated in a baffle pad 20 to a predetermined temperature.
  • the baffle pad is shown by dashed lines.
  • the nozzles are preferably located on at least two sides of a pressure chamber 60 within the oven chamber 80th
  • the tool 90 introduced there is heated to the predetermined temperature, which, for example, amounts to 400 ° C. to 550 ° C. for some steels.
  • the furnace chamber 80 can be flooded with protective or reaction gas and rinsed. Once a tool 90 is needed, the operator removes it by opening the furnace lid 40 and feeds it directly into the press.
  • the nozzle array 20 consists primarily of a pressure chamber 60 and a furnace chamber 80 which is highly insulated and gas-tight to the outside.
  • the nozzle array 20 can be heated in various ways. The heating can be done, for example, electrically or with fuel.
  • the heating temperature of the nozzle array corresponds at least to the predetermined heating temperature of the tools, but it is preferably slightly higher than this. The actual required temperature must be determined empirically. Typical temperature differences are of the order of 10 to 100 ° C. At a treatment temperature of about 650 ° C, the nozzle field temperature is for example 20 ° C above the predetermined heating temperature of the tools.
  • the tools 90 located in the oven chamber 80 are continuously surrounded by fresh fluid, which is accelerated by means of one or more fans 100.
  • the fluid exits from a plurality of openings 110 and contacts the tool as a typical impact jet.
  • a very good heat transfer from the fluid to the tool is realized, so that in this way short heating times can be realized.
  • the required time is divided into three and halved the temperature band.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Furnace Details (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP05015970A 2004-08-05 2005-07-22 Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion Not-in-force EP1627696B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004038247A DE102004038247B3 (de) 2004-08-05 2004-08-05 Vorrichtung und Verfahren zur Erwärmung von Strangpresswerkzeugen vor dem Einbau in eine Strangpresse

Publications (2)

Publication Number Publication Date
EP1627696A1 true EP1627696A1 (fr) 2006-02-22
EP1627696B1 EP1627696B1 (fr) 2007-05-02

Family

ID=34937894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05015970A Not-in-force EP1627696B1 (fr) 2004-08-05 2005-07-22 Dispositif et méthode de chauffage des filières d'extrusion avant montage dans une presse d'extrusion

Country Status (3)

Country Link
EP (1) EP1627696B1 (fr)
AT (1) ATE361158T1 (fr)
DE (2) DE102004038247B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2785506A4 (fr) * 2011-12-02 2015-07-22 Exco Technologies Ltd Système de préchauffage de filière d'extrudeuse, appareil et procédé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9106439U1 (de) * 1991-05-25 1991-07-18 Otto Junker Gmbh, 5107 Simmerath Ofen zum gleichmäßigen Erwärmen von metallischem Gut
EP0529198A2 (fr) * 1991-04-30 1993-03-03 CO.M.P.ES. S.p.A. Four à atmosphère controlée, en particulier pour le préchauffage de matrices d'extrusion pour l'aluminium et ses alliages
EP0621345A1 (fr) * 1993-04-19 1994-10-26 Hauzer Holding B.V. Procédé et dispositif pour le traitement thermique de pièces
DE19627300A1 (de) * 1996-07-06 1998-01-08 Kramer Carl Vorrichtung zum Wärmeeintrag in einen Tiegel mittels erzwungener Konvektion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580973A (en) * 1984-07-09 1986-04-08 Ronald R. Yamada Kiln with improved heat distribution

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529198A2 (fr) * 1991-04-30 1993-03-03 CO.M.P.ES. S.p.A. Four à atmosphère controlée, en particulier pour le préchauffage de matrices d'extrusion pour l'aluminium et ses alliages
DE9106439U1 (de) * 1991-05-25 1991-07-18 Otto Junker Gmbh, 5107 Simmerath Ofen zum gleichmäßigen Erwärmen von metallischem Gut
EP0621345A1 (fr) * 1993-04-19 1994-10-26 Hauzer Holding B.V. Procédé et dispositif pour le traitement thermique de pièces
DE19627300A1 (de) * 1996-07-06 1998-01-08 Kramer Carl Vorrichtung zum Wärmeeintrag in einen Tiegel mittels erzwungener Konvektion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PFAU M ET AL: "NEUE ANLAGE ZUR ERWAERMUNG VON STRANGPRESSWERKZEUGEN", UMFORMTECHNIK, MEISENBACH, BAMBERG, DE, vol. 34, no. 1, 1 March 2000 (2000-03-01), pages 20,23, XP000948888, ISSN: 0300-3167 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2785506A4 (fr) * 2011-12-02 2015-07-22 Exco Technologies Ltd Système de préchauffage de filière d'extrudeuse, appareil et procédé

Also Published As

Publication number Publication date
ATE361158T1 (de) 2007-05-15
DE102004038247B3 (de) 2006-05-11
DE502005000649D1 (de) 2007-06-14
EP1627696B1 (fr) 2007-05-02

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