EP0124680B1 - Gasbeheizte Düse für eine Zink-Druckgussmaschine - Google Patents

Gasbeheizte Düse für eine Zink-Druckgussmaschine Download PDF

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Publication number
EP0124680B1
EP0124680B1 EP19840100203 EP84100203A EP0124680B1 EP 0124680 B1 EP0124680 B1 EP 0124680B1 EP 19840100203 EP19840100203 EP 19840100203 EP 84100203 A EP84100203 A EP 84100203A EP 0124680 B1 EP0124680 B1 EP 0124680B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
metal
groove
heat
die
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
Application number
EP19840100203
Other languages
English (en)
French (fr)
Other versions
EP0124680A1 (de
Inventor
Kenneth P. Zecman
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.)
Pegasus Industries Inc
Original Assignee
Pegasus Industries Inc
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 Pegasus Industries Inc filed Critical Pegasus Industries Inc
Publication of EP0124680A1 publication Critical patent/EP0124680A1/de
Application granted granted Critical
Publication of EP0124680B1 publication Critical patent/EP0124680B1/de
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars

Definitions

  • This invention relates to a diecasting apparatus for casting molten metals and particularly to a nozzle according to the first part of claim 1 (DE-A-2716950) which is used to transfer the molten metal from a source to a mold.
  • Casting operations are often carried out using a transfer conduit, commonly called "nozzle", which is trapped in a mechanical combination between a gooseneck spout and a mold or mold bushing.
  • the nozzle is heated to prevent freezing of the molten zinc in the interior bore thereof, such heating typically being accomplished by a gas-fired torch which is trained upon a localized area of the nozzle.
  • a gas-fired torch which is trained upon a localized area of the nozzle.
  • the temperature of the locally heated area is necessarily very high.
  • the present invention provides an improved casting nozzle adapted to be torch- heated but designed to provide an even heat distribution throughout the nozzle body thereby to increase nozzle life and eliminate the problems associated with high-temperature localized heating of prior art devices.
  • this is accomplished by providing a channel of high conductivity material in the nozzle body, such channel extending through the locally heated area and extending out to other parts of the nozzle body to rapidly and efficiently transfer heat away from the locally heated area and into the bulk of the nozzle body over substantially its entire length.
  • a nozzle 10 is illustrated in Figure 1 connected between gooseneck 12 and die bushing 14.
  • the gooseneck and the die bushing are conventional components of zinc die casting apparatus.
  • the gooseneck is adapted to receive molten zinc from a source 15.
  • the bushing 14 has a cooling water jacket 17 and a semispherical socket 16 for receiving the forward end of the nozzle for passing molten zinc into die opening 18, in the manner well known to those skilled in the art.
  • Conventional gasfired torch means 20 provide a flame located adjacent the forward end of the nozzle.
  • the nozzle 10 has an elongated steel body 22 having a longitudinal opening 24 for passing molten zinc from the rearward end 26 to the forward end 28.
  • the rearward end has a semi-spherical socket 30 for mating with the gooseneck. It is to be understood that other forms of conventional nozzles have a ball-shaped rearward end for engaging a complementary structure on a gooseneck.
  • Forward end 28 has an insert 32 forming the nose of the nozzle.
  • the insert is made of a material harder than the body of the nozzle to provide long wearing engagement with socket 16 of the die bushing.
  • the insert 32 may be considered optional.
  • Nozzle body 22 has a helical groove 34 extending from ring 33, around the body, and toward the rear end of the body. The size and spacing between turns of the groove depends upon the length and diameter of the nozzle as well as the amount of zinc passing through longitudinal opening 24.
  • a core of copper 40 is welded or brazed into the groove 34. Copper is preferred because it has a greater heat conductivity than the steel body to form a heat-conducting path or channel so that the temperature of the nozzle along its length is relatively uniform.
  • a stainless steel jacket 42 is mounted over the outer, cylindrical surface of the nozzle, and an insulating sleeve 44 is disposed between jacket 42 and the surface of body 22.
  • Jacket 42 and sleeve 44 are cut out at 47 to expose the steel body to the heat of torch 20.
  • the after end of sleeve 44 terminates at 46.
  • the jacket 42 and sleeve 44 are optional elements; i.e., the device 10 may be used effectively without them.
  • a second embodiment of the invention is shown to comprise a nozzle 50 comprising a steel body 52 having a spherical end adapted to fit into a mold bushing such ap that shown at 14 in Figure 1.
  • the other end of the nozzle 50 is configured, either concave or convex, to receive a source of molten metal under pressure.
  • a longitudinal and axially centered bore 54 provides the passage for molten zinc and extends from one end of the body 52 to the other.
  • the body 52 is optionally covered or jacketed with a cylindrical sleeve 56 of insulative material such as ceramic fiber.
  • the fit is a relatively loose one around the nozzle body 52 and the jacket or sleeve 56 projects slightly forward of the taper and the body 52 to come as close to abutting the exterior surface of the bushing 14 as possible when placed into the arrangement illustrated in Figure 1.
  • An oval shaped hole 58 is cut or otherwise formed in the sleeve 56 to define the locally heated area, i.e., the area of the body 52 which is to receive the flame from the heating torch 20 when placed in the operative combination of Figure 1.
  • the nozzle body 52 is machined to provide a wide groove extending circumferentially around the nozzle body in the area immediately under the opening or hole 58 in the sleeve 56 and further to provide a helical groove 62 which winds around the balance of the nozzle body as best illustrated in Figure 5.
  • the grooves, both the circumferential and helical portions thereof, are filled with copper by a welding or brazing operation so as to provide a wide band 64 of copper around the circumference of the nozzle body adjacent the nose or ball portion thereof and a helical band 66 which winds around the body toward the rearward end thereof.
  • the location of the band 64 and the hole in the sleeve 56 may be varied along the length of the nozzle 50.
  • the nozzles to which the subject invention may be applied range from relatively small devices of about 3,8 cm diameter by 15 cm in length to larger nozzles which are 7,5-10 cm in diameter and from 15-30 inches long.
  • the copper band 64 in groove 60 is preferably on the order of about 6,35 mm in depth, depending upon the diameter of the nozzle, and may vary in pitch or longitudinal distance between turns in accordance with the particular requirements of the application.
  • This structure permits a gas-fired torch to maintain a relatively uniform temperature along the nozzle, requires less gas consumption while maintaining the temperature of the zinc at a molten state above 454 degrees C. as it passes through the nose, and reduces any hot spots tending to burn out the nozzle body.
  • the invention is not limited to gas-heated devices but may also be used with, for example, electric heater cartridges which also produce localized heating to be advantageously distributed over the nozzle body by the subject invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (13)

1. Düse (10) einer Druckgußeinrichtung zum Gießen geschmolzenen Metalls, insbesondere von Zink oder dessen Legierungen, mit einem länglichen Körper (22) aus starrem Metall mit einer axialen Durchbohrung (24) und einem lokalen zu heizenden Bereich, gekennzeichnet durch Mittel zur Begrenzung eines Kanals (34) in dem Körper (22) der sich von dem lokalen zu heizenden Bereich des Körpers (22) über den Rest des Körpers (22) erstreckt und mit einem Metall (40) mit höherem Wärmeleitfähigkeitskoeffizienten als das Körpermetall gefüllt ist, wodurch er Wärme von dem lokalen Bereich aufnimmt und sie über den Rest des Düsenkörpers (22) verteilt.
2. Düse nach Anspruch 1, ferner umfassend eine isolierende Hülse (44), die auf mindestens einem Teil des Düsenkörpers (22) angeordnet ist und eine sie durchsetzende Öffnung (47) hat, die eine Wärmeeinwirkung auf den lokalen Bereich erlaubt.
3. Düse nach Anspruch 2, bei der die Hülse (44) aus einem keramischen Material besteht.
4. Düse nach Anspruch 1, bei der der Kanal (34) eine schraubenförmig gewundene Nut im Umfang des Düsenkörpers (22) ist, die mit Kupfer (40) gefüllt ist.
5. Düse nach Anspruch 4, bei der der Kanal zusätzlich zu der schraubenformig gewundenen Nut (62) ein Umfangsband (64) aus Kupfer aufweist, das durch den lokal geheizten Bereich läuft.
6. Düse nach Aspruch 5, bei der das Band (64) breiter als die Nut (62) ist.
7. Düse nach Anspruch 6, bei der das Band (64) nahe dem Austrittsende der Düse (10) vorgesehen ist.
8. Druckgußeinrichtung zum Gießen geschmolzenen Metalls wie Zink, umfassend
eine Quelle (15) geschmolzenen Metalls;
Formmittel (14) mit einer Öffnung (16) zur Aufnahme des geschmolzenen Metalls;
eine Düse (10) zum Übertragen des Metalls von der Quelle (15) zu den Formmitteln (14) und Mittel (20) zum Heizen der Düse (10), um das Metall bei seiner Übertragung im geschmolzenen Zustand zu halten; wobei die Düse umfaßt:
einen länglichen Metallkörper (22) mit einem vorderen Ende (28), einem hinteren Ende (26) und einer länglichen Öffnung (24), die vom hinteren Ende (26) zum vorderen Ende (28) verläuft und zur Durchleitung von Metall dient, wobei das vordere Ende (28) eine teilkugelige Nase (32) hat, die zum Ansetzen an die Öffnung (16) in den Formmitteln (14) dient, dadurch gekennzeichnet, daß
der Körper (22) eine in Längsrichtung vom hinteren Ende (26) zum vorderen Ende (28) verlaufende Nut (34) auf seiner Oberfläche hat und aus Metall mit einer ersten Wärmeleitfähigkeit besteht;
und daß ein zweites Metall (40) mit einer zweiten, größeren Wärmeleitfähigkeit in der Nut (34) angeordnet ist und einen wärmeleitenden Weg längs des Körpers (22) bildet, wodurch Wärme, die von den Mitteln (20) zum He zen an einer Stelle auf dem Körper (22) übernommen wird, längs dieses Weges auf den Rest des Körpers (22) übertragen wird.
9. Einrichtung nach Anspruch 8, in der die Nut (34) eine von dem einen Ende (26) zum anderen Ende (28) schraubenförmig um den Körper (22) gewundene Nut ist.
10. Einrichtung nach Anspruch 8, in der die Düse (10) einen Stahlkörper (22) hat und das zweite Metall (40) in die Nut (34) geschweißtes Kupfer ist.
11. Einrichtung nach Anspruch 8, bei der die Nut (34) einen als Umgangsring ausgebildeten Teil (33) aufweist, der von gleicher Ausdehnung wie die genannte Stelle ist.
12. Einrichtung nach Anspruch 8, in der der Körper (22) erwärmt wird, um das durch die längliche Öffnung (24) hindurchtretende Metall auf einer Temperatur von mehr als 454°C zu halten.
13. Einrichtung nach Anspruche 8, mit Isoliermitteln (44), die mindestens einen Teil des Körpers (22) bedecken.
EP19840100203 1983-04-11 1984-01-10 Gasbeheizte Düse für eine Zink-Druckgussmaschine Expired EP0124680B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US48386983A 1983-04-11 1983-04-11
US483869 1983-04-11
US53340983A 1983-09-19 1983-09-19
US533409 1983-09-19

Publications (2)

Publication Number Publication Date
EP0124680A1 EP0124680A1 (de) 1984-11-14
EP0124680B1 true EP0124680B1 (de) 1987-09-16

Family

ID=27047786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840100203 Expired EP0124680B1 (de) 1983-04-11 1984-01-10 Gasbeheizte Düse für eine Zink-Druckgussmaschine

Country Status (3)

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EP (1) EP0124680B1 (de)
CA (1) CA1213121A (de)
DE (1) DE3466185D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4429816A1 (de) * 1994-08-23 1996-02-29 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement
DE202007009072U1 (de) 2007-06-28 2008-11-06 Sfr Formenbau Gmbh Anordnung einer Einspritzdüse zur Führung von Schmelzemasse in einer Kunststoffspritzgießform o.dgl.
EP2008789A1 (de) 2007-06-28 2008-12-31 SFR Formenbau GmbH Anordnung einer Einspritzdüse zur Führung von Schmelzmasse in einer Kunststoffspritzgiessform

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996029165A1 (de) * 1995-03-20 1996-09-26 Bayrisches Druckguss-Werk Thurner Gmbh & Co. Kg Verfahren zur herstellung von druckgussteilen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1097472A (en) * 1976-07-16 1981-03-17 Walter R. Crandell Electrically heated nozzle and method of making the same
DE2949637A1 (de) * 1979-12-10 1981-06-11 Eisenwerk Hensel Bayreuth Dipl.-Ing. Burkhardt Gmbh, 8580 Bayreuth Elektrisch beheizbare einspritzduese fuer warmkammer-druckgiessmaschinen
DE8110364U1 (de) * 1981-04-06 1982-04-01 Ing. G. Dekorsky KG, 7760 Radolfzell "heisskanalspritzduese"

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4429816A1 (de) * 1994-08-23 1996-02-29 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement
DE4429816C2 (de) * 1994-08-23 2000-02-17 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement und Verfahren zur Herstellung desselben
DE202007009072U1 (de) 2007-06-28 2008-11-06 Sfr Formenbau Gmbh Anordnung einer Einspritzdüse zur Führung von Schmelzemasse in einer Kunststoffspritzgießform o.dgl.
EP2008789A1 (de) 2007-06-28 2008-12-31 SFR Formenbau GmbH Anordnung einer Einspritzdüse zur Führung von Schmelzmasse in einer Kunststoffspritzgiessform
DE102007029954A1 (de) 2007-06-28 2009-01-02 Sfr Formenbau Gmbh Anordnung einer Einspritzdüse zur Führung von Schmelzemasse in einer Kunststoffspritzgießform od. dgl.

Also Published As

Publication number Publication date
EP0124680A1 (de) 1984-11-14
DE3466185D1 (de) 1987-10-22
CA1213121A (en) 1986-10-28

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