EP1354650B1 - Düse für Druckgiessmaschine - Google Patents

Düse für Druckgiessmaschine Download PDF

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Publication number
EP1354650B1
EP1354650B1 EP02425245A EP02425245A EP1354650B1 EP 1354650 B1 EP1354650 B1 EP 1354650B1 EP 02425245 A EP02425245 A EP 02425245A EP 02425245 A EP02425245 A EP 02425245A EP 1354650 B1 EP1354650 B1 EP 1354650B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
cavities
nozzle according
electrical conductor
channel
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.)
Expired - Lifetime
Application number
EP02425245A
Other languages
English (en)
French (fr)
Other versions
EP1354650A1 (de
Inventor
Salvatore Bonvegna
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP02425245A priority Critical patent/EP1354650B1/de
Priority to AT02425245T priority patent/ATE318667T1/de
Priority to DE60209462T priority patent/DE60209462T2/de
Priority to ES02425245T priority patent/ES2258137T3/es
Publication of EP1354650A1 publication Critical patent/EP1354650A1/de
Application granted granted Critical
Publication of EP1354650B1 publication Critical patent/EP1354650B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • the invention relates to die-casting of metals in general and more particularly to that performed using the so-called "hot chamber” technique; it is further intended specifically to the die-casting of metals at high temperatures, as occurs in the case of magnesium and its alloys.
  • the heating thermal energy is provided by means of Joule effect with a resistance wound around the channel; an example of this kind of heating system is described in German patent application No. 4,439,872.
  • heating of the channel in the nozzle may be obtained by means of electromagnetic induction; in this case the conductor wound around the channel generates a variable magnetic induction field, so that the wall of the channel is heated by the currents induced inside it.
  • US-3,156,959-A discloses a casting apparatus with an elongate nozzle which is heated by a separate heater element attached to the outside of the nozzle body.
  • the present invention aims to improve the general state of the art described above.
  • the object of the invention is to provide a nozzle for die-casting apparatus which is simple either from the structural and functional point of view, thereby ensuring operational reliability and heating efficiency of the molten metal channel.
  • numeral 1 denotes in its entirety a nozzle according to the invention which comprises a main body 2 axially provided with a channel 3 wherein the molten metal flows, coming from the trap (not shown in the drawings), in a manner known per se.
  • the nozzle body 2 which will be described in greater detail below, is insulated outside with a layer of thermally insulating material 4 which is in turn enclosed in a casing 5, consisting of a metal sheet rolled up and closed by fasteners 6.
  • the nozzle 1 is equipped with a unit 7 housing the terminal block for connection thereof to the cables 8 of the electric power supply, provided by the public mains network.
  • the nozzle body 2 shown in detail in Fig. 3 without the insulation, is made from special steel of the type commonly used for these applications; it is provided, at the front, with the typical conical end 20 for engagement with a matching seat of the mould (not shown in the drawings) where the molten metal is injected and, at the rear, with a tang 21 for engagement thereof with the trap of the hot chamber (not shown).
  • cavities 22 extend parallel thereto, between a front annular chamber 23 and a rear annular chamber 24 respectively coaxial with the conical end 20 and the tang 21. These cavities contain inside them (cf. Fig. 5 which shows one of them) the electrical components for heating the nozzle body 2.
  • These components comprise, for each cavity, an electrically insulating tubular sleeve 25 made of ceramic material, preferably based on cordierite such as for example that known commercially with the name of Kerostat; the sleeve 25 is filled with a powder 26 of zirconium silicates (Zr Si 0 4 ), wherein an electrical resistance 27 is embedded.
  • an electrically insulating tubular sleeve 25 made of ceramic material, preferably based on cordierite such as for example that known commercially with the name of Kerostat; the sleeve 25 is filled with a powder 26 of zirconium silicates (Zr Si 0 4 ), wherein an electrical resistance 27 is embedded.
  • the latter may consist of a filament of any suitable material resistant to the high temperatures required for these applications; however, in accordance with a preferred embodiment of the invention, this filament is made from austenitic alloys based on nickel and chromium, such as those known commercially by the name of Nikrothal and manufactured by the company Kanthal.
  • the filament which forms the resistances 27 is wound helically inside each cavity, with a differential pitch: i.e. thicker towards the end zones E 1 , E 2 , and thinner in the central zone C.
  • the end zones E 1 , E 2 are subject to greater thermal dispersion due to edge effects in the axial direction: the greater density of turns of the filament in these zones allows to compensate for these edge effects, thereby ensuring that the heat produced by the latter is uniform with that of the central zone C.
  • the filament of the electrical resistance 27 is the same for all the cavities 22: i.e. it is a single filament which passes through all of them, entering into one of the annular chambers 23, 24 and emerging from the other chamber, for continuing into the next cavity.
  • the internal wall thereof is lined with sheets of mica agglomerate, for example of the type known commercially by the name of flogopite; moreover, they are filled with the same zirconium powder present in the cavities 22.
  • the chambers 23 and 24 are closed by respective covers 30 (in Fig. 1 only one of them is visible) fitted into seats 31, 32 especially provided therein.
  • the nozzle body 2 is provided in the region of one of the cavities 22, with connectors 33 and 34 through which the ends of the said filament are passed.
  • the electrical resistances 27 of the nozzle according to this invention may be arranged inside the body 2 and therefore in a position close to the molten metal channel 3, owing to the cavities 23 which are obtained with normal mechanical boring machining.
  • the heating efficiency is therefore significantly increased, all other conditions remaining unchanged.
  • the example considered above is specifically intended for the high temperatures used in the die-casting of magnesium alloys; however, it is obvious that the nozzle according to the invention may also be used for processing metals involving lower temperatures.
  • filaments for electrical resistance made of a material different from the Ni and Cr based alloy; similar considerations are also applicable for the zirconium used in the powder filling the cavities 22, which may be replaced by other suitable materials.
  • resistances connected electrically together in parallel with conductors arranged at the ends, such as conductors formed by rings advantageously housed in the annular chambers 23 and 24, between which said resistances housed in the cavities extend.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (11)

  1. Düse für eine Druckgießvorrichtung, umfassend einen Düsenkörper (2) mit einem Auslaufkanal (3) für das geschmolzene Metall, mindestens einen elektrischen Leiter (27), der mit dem Düsenkörper verbunden ist, um diesen zu erhitzen, dadurch gekennzeichnet, dass der Körper (2) der Düse eine Mehrzahl von Aushöhlungen (22) umfasst, in denen sich der mindestens eine elektrische Leiter befindet, und dass diese Aushöhlungen um den Auslaufkanal herum in einer Zwischenstellung zwischen dem zuletzt genannten und der Außenfläche des Düsenkörpers angeordnet sind und parallel zu diesem verlaufen.
  2. Düse nach Anspruch 1, wobei der mindestens eine Leiter einen elektrischen Widerstand (27) umfasst.
  3. Düse nach Anspruch 2, wobei der elektrische Widerstand (27) aus einem Glühfaden besteht, der spiralförmig mit einer unterschiedlichen Steigung gewunden ist, die in den Zonen (E1, E2') an den Enden der Aushöhlungen (22) dichter ist als in dessen Mittelbereich (C).
  4. Düse nach einem der vorangehenden Ansprüche, wobei der Widerstand aus einem Glühfaden aus einer austenitischen Legierung, umfassend Ni und Cr, besteht.
  5. Düse nach einem der vorangehenden Ansprüche, wobei der mindestens eine elektrische Leiter (27) nacheinander entlang einer Mehrzahl von Aushöhlungen verläuft, in die er eintritt und an jeder von diesen an ihrem Ende austritt.
  6. Düse nach Anspruch 5, wobei sich die Aushöhlungen (22) längs zwischen zwei ringförmigen Kammern (23, 24) erstrecken, die koaxial zu dem Auslaufkanal (3) sind, in dem der mindestens eine Leiter verläuft, um aus einer Aushöhlung auszutreten und in eine eindere einzutreten.
  7. Düse nach einem der vorangehenden Ansprüche, wobei die Aushöhlungen (22) einen kreisförmigen Querschnitt aufweisen.
  8. Düse nach einem der vorangehenden Ansprüche, wobei der mindestens eine elektrische Leiter (27) in ein Pulver oder eine ähnliche Art von Material (26) eingebettet ist, wie es sich im Inneren der Aushöhlungen (22) befindet.
  9. Düse nach Anspruch 8, wobei das Material (26), in das der mindestens eine Leiter (27) eingebettet ist, ein Zirkoniumsilicat-Pulver ist.
  10. Düse nach Anspruch 8 oder 9, wobei der elektrische Leiter (27) und das Material (26) in das er eingebettet ist, im Inneren von elektrischen Isolierschläuchen (25) enthalten sind, die in den Aushöhlungen (22) angeordnet sind.
  11. Düse nach Anspruch 10, wobei die elektrischen lsolierschläuche (25) aus Cordierit oder einem ähnlichen Material hergestellt sind.
EP02425245A 2002-04-19 2002-04-19 Düse für Druckgiessmaschine Expired - Lifetime EP1354650B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP02425245A EP1354650B1 (de) 2002-04-19 2002-04-19 Düse für Druckgiessmaschine
AT02425245T ATE318667T1 (de) 2002-04-19 2002-04-19 Düse für druckgiessmaschine
DE60209462T DE60209462T2 (de) 2002-04-19 2002-04-19 Düse für Druckgiessmaschine
ES02425245T ES2258137T3 (es) 2002-04-19 2002-04-19 Boquilla para dispositivo de moldeado a presion.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02425245A EP1354650B1 (de) 2002-04-19 2002-04-19 Düse für Druckgiessmaschine

Publications (2)

Publication Number Publication Date
EP1354650A1 EP1354650A1 (de) 2003-10-22
EP1354650B1 true EP1354650B1 (de) 2006-03-01

Family

ID=28459631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425245A Expired - Lifetime EP1354650B1 (de) 2002-04-19 2002-04-19 Düse für Druckgiessmaschine

Country Status (4)

Country Link
EP (1) EP1354650B1 (de)
AT (1) ATE318667T1 (de)
DE (1) DE60209462T2 (de)
ES (1) ES2258137T3 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156959A (en) * 1959-09-04 1964-11-17 Eltra Corp Linecasting machines
US4635851A (en) * 1983-09-19 1987-01-13 Pegasus Industries, Inc. Casting nozzle
DE4439872C2 (de) * 1994-11-08 1998-05-20 Klaus Friedrich Mundstückkörper für eine Warmkammer-Druckgießmaschine
DE19531161C2 (de) * 1995-08-24 1999-05-20 Frech Oskar Gmbh & Co Warmkammer-Druckgießmaschine

Also Published As

Publication number Publication date
DE60209462T2 (de) 2006-10-19
EP1354650A1 (de) 2003-10-22
ES2258137T3 (es) 2006-08-16
ATE318667T1 (de) 2006-03-15
DE60209462D1 (de) 2006-04-27

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