EP1627696B1 - 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
EP1627696B1
EP1627696B1 EP05015970A EP05015970A EP1627696B1 EP 1627696 B1 EP1627696 B1 EP 1627696B1 EP 05015970 A EP05015970 A EP 05015970A EP 05015970 A EP05015970 A EP 05015970A EP 1627696 B1 EP1627696 B1 EP 1627696B1
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EP
European Patent Office
Prior art keywords
heating
dies
temperature
heated
fluid
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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.)
Not-in-force
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EP05015970A
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German (de)
English (en)
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EP1627696A1 (fr
Inventor
Rolf-Josef Schwartz
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Individual
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Individual
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    • 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 extruding 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 required temperature of the tools is in the range of 400 ° C to 550 ° C.
  • the heating of the tools should be as uniform and fast as possible, so that the thermal distortion, the oxidation and the stain remain as low as possible and the tool can be provided quickly.
  • the tools are usually round elements with filigree openings, which consist of high-strength steel and several consecutively connected plates.
  • 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 thus produce 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. In multiple tool ovens, it often happens that cold tools are used in addition to warmed-up and then cool these inadmissibly on filigree elements. This can lead to tool breakage during pressing, which also causes high costs.
  • a furnace for the uniform heating of metallic material has a pressure channel system delimiting the furnace interior.
  • the pressure channel system opens at the bottom of the furnace below the transport plane of the material to be heated in nozzle boxes with nozzles directed into the furnace interior.
  • On the furnace ceiling fans are arranged, which lead a heated by heaters fluid via the nozzles on the surface of the material to be heated, the warming material is acted on one side from below with the heated fluid.
  • the fluid flows from below to the top of the furnace chamber and is sucked in there by the fans to flow out again after the heating of the nozzles of the nozzle boxes.
  • EP 0 529 198 A2 describes a controlled atmosphere furnace which is particularly suitable for heating extrusion molds for aluminum or alloys thereof.
  • the oven has a plurality of chambers, in each of which a mold to be heated can be introduced.
  • the heating was accomplished by electrical resistances, and preferably in an atmosphere devoid of oxygen, to prevent oxidation of the mold surfaces.
  • Each chamber can be opened in a drawer, so that the removal of a workpiece does not affect the condition in the other chambers.
  • 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 heat-insulated furnace housing, which at least one loading and unloading opening with a furnace lid having. Within the furnace housing, 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, by 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 heater can be heated in various ways. It has proven to be useful to heat the blast furnace directly or indirectly. This can be done for example with electrical resistance elements or with the help of one or more fuel-operated burner. It has proved to be useful that the baffle pad thermostatically preserved at a temperature is, which is above the predetermined heating temperature of the tools.
  • the temperature of the fluid is for example about 10 to 100 ° C above the predetermined heating temperature of the tools.
  • 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 radiation 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 located on two opposite 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)

Claims (12)

  1. Dispositif pour chauffer des outils pour extrudeuse avant le montage dans une extrudeuse dans lequelle les outils sont portés à une température prédéterminée et maintenus à cette température, le dispositif (10) comprenant une carcasse de four (50) étanche aux gaz et thermoisolée, laquelle comporte au moins une ouverture de chargement et de retrait (70) avec un couvercle de four (40), et un champ de gicleurs (20) dans la zone duquel un outil (90) peut être placé étant disposé à l'intérieur de la carcasse du four, et le dispositif (10) étant pourvu d'un dispositif de chauffage (100) qui chauffe un fluide qui s'écoule par les orifices (110) du champ de gicleurs (20), caractérisé en ce que les orifices (110) du champ de gicleurs (20) sont disposés sur deux côtés opposés de la zone dans laquelle l'outil (90) peut être placé.
  2. Dispositif selon la revendication 1, caractérisé en ce qu'au moins un ventilateur (30) est prévu pour faire circuler le fluide à travers le dispositif de chauffage (100) et le champ de gicleurs (20).
  3. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que le dispositif de chauffage (100) est chauffable électriquement.
  4. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que le dispositif de chauffage (100) est chauffable par un brûleur fonctionnant avec un combustible.
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que le champ de gicleurs (20) peut être maintenu à l'aide d'un thermostatiquement à une température qui se situe au-dessus de la température de chauffage prédéterminée pour les outils (90).
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que le dispositif peut fonctionner avec un gaz de protection ou de réaction.
  7. Procédé pour chauffer des outils pour extrudeuse (90) avant le montage dans une extrudeuse, le procédé comprenant les étapes suivantes:
    - mise en place des outils dans un dispositif qui comporte un champ de gicleurs, les orifices de gicleurs (110) du champ de gicleurs (20) étant disposés sur deux côtés opposés de la zone du dispositif dans laquelle on place les outils;
    - exposition des outils à des jets d'un fluide chauffé;
    - chauffage des outils à une température prédéterminée et
    - maintien des outils à la température prédéterminée.
  8. Procédé selon la revendication 7, caractérisé en ce qu'un seul outil (90) est placé respectivement dans un dispositif (10), y est chauffé et maintenu à la température prédéterminée.
  9. Procédé selon l'une des revendications 7 et 8, caractérisé en ce que le procédé est exécuté dans le dispositif (10) sous atmosphère de gaz de protection ou de gaz de réaction.
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce que le fluide est chauffé par des dispositifs de chauffage (100) et s'écoule par des orifices de gicleurs (110) sur un ou plusieurs outils (90) au moyen d'un ou de plusieurs ventilateurs (30).
  11. Procédé selon l'une des revendications 7 à 10, caractérisé en ce que la température du fluide se situe environ 10 à 100 °C au-dessus de la température de chauffage prédéterminée des outils (90).
  12. Procédé selon l'une des revendications 7 à 11, caractérisé en ce que les outils (90), après le chauffage, sont montés dans une extrudeuse.
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

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

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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

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

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JP6095683B2 (ja) * 2011-12-02 2017-03-15 エクスコ テクノロジーズ リミテッドＥｘｃｏ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｌｉｍｉｔｅｄ 押出金型予熱システム、装置、および方法

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US4580973A (en) * 1984-07-09 1986-04-08 Ronald R. Yamada Kiln with improved heat distribution
IT1247439B (it) * 1991-04-30 1994-12-14 Co M P Es Spa Forno ad atmosfera controllata particolarmente per il preriscaldamento di matrici di estrusione di alluminio e sue leghe
DE9106439U1 (de) * 1991-05-25 1991-07-18 Otto Junker Gmbh, 5107 Simmerath Ofen zum gleichmäßigen Erwärmen von metallischem Gut
DE4312627A1 (de) * 1993-04-19 1994-10-20 Hauzer Holding Verfahren und Vorrichtung zur Wärmebehandlung von Gegenständen
DE19627300A1 (de) * 1996-07-06 1998-01-08 Kramer Carl Vorrichtung zum Wärmeeintrag in einen Tiegel mittels erzwungener Konvektion

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DE502005000649D1 (de) 2007-06-14
DE102004038247B3 (de) 2006-05-11
EP1627696A1 (fr) 2006-02-22
ATE361158T1 (de) 2007-05-15

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