EP0409805B1 - Vorrichtung zum Dekontaminieren einer Giesskokille, die insbesondere für Titan und dergleichen verwendet wurde - Google Patents

Vorrichtung zum Dekontaminieren einer Giesskokille, die insbesondere für Titan und dergleichen verwendet wurde Download PDF

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Publication number
EP0409805B1
EP0409805B1 EP90830318A EP90830318A EP0409805B1 EP 0409805 B1 EP0409805 B1 EP 0409805B1 EP 90830318 A EP90830318 A EP 90830318A EP 90830318 A EP90830318 A EP 90830318A EP 0409805 B1 EP0409805 B1 EP 0409805B1
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EP
European Patent Office
Prior art keywords
sealed chamber
casting
inert gas
titanium
chamber
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
EP90830318A
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English (en)
French (fr)
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EP0409805A1 (de
Inventor
Arturo Hruska
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.)
HRUSKA Srl
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HRUSKA Srl
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Filing date
Publication date
Application filed by HRUSKA Srl filed Critical HRUSKA Srl
Publication of EP0409805A1 publication Critical patent/EP0409805A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/005—Castings of light metals with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C

Definitions

  • the present invention relates to a device for decontaminating casting moulds, particularly for titanium castings and the like.
  • the present invention relates to a device of the said type, particularly suitable for titanium castings, which device allows the decontamination of the casting mould or cylinder to be realized before the latter is inserted into the casting machine, which greatly simplifies the realization and the operation of said castings, and allows casting articles with optimum characteristics to be obtained.
  • investment castings are realized by making a wax model of the article to be obtained, which model is then recovered with a coating of a refractory material.
  • the whole is subjected to a furnace heat treatement, during which the wax sublimes leaving a cavity corresponding to the piece to be obtained at the interior of the coating.
  • the casting cylinder so obtained is placed at the interior of the casting machine.
  • the first one has a centrifugal system and works on the basis of argon saturation without vacuum.
  • the second kind of machine is based on argon saturation and it works under vacuum but without any centrifugal system.
  • castings must have accurate fit, with very thin and strong margins.
  • the first kind of casting machines (centrifugal casting machines) work by argon saturation of the casting chamber and the castings have thin margins and accurate fit, but metal will be contaminated because of absence of vacuum.
  • the main problem for this kind of machines is that of obtaining the vacuum by sealing the centrifugal system. It is technically very difficult and, mainly, very much expensive.
  • the second kind of machines (vacuum machines), not having the centrifugal system, allows to obtain castings without contamination, but it is impossible to get multiple castings with good thin margins.
  • the Applicant of the present invention having well aware of the problems and needs mentioned above, has realized a device which allows all the drawbacks to be obviated, allowing a casting, particularly a titanium casting, to be realized, in a fully decontaminated environment and so an optimum quality article to be obtained.
  • the device according to the present invention does not require the realization of complex sealing systems in the casting chamber of the casting machine, because in said chamber neither the inlet of the inert gases, nor, least of all, a vacuum are to be realized.
  • the device according to the invention is used with a centrifugal system and provides an adequate vacuum with helium as the only residual gas.
  • the decontamination is realized outside of the casting chamber, in an environment of a reduced size as compared to that of the casting chamber, and the device so prepared is directly placed into the chamber.
  • the molten metal flow from the crucible onto the foil and melts it, and is kept in a decontaminated environment, under a vacuum, at the interior of which it is sucked off realizing an impurity-free casting.
  • a device for decontamination the casting mould particularly for titanium castings and the like, which device comprises a sealed chamber, at the interior of which the casting cylinder is placed, said device being also endowed on its upper side with a means for the connection to an inert gas reservoir and with a vacuum source, and on the lower side with a thin sheet of a material that doesn't contaminate the metal to be cast, and having a thickness that allows it to withstand the vacuum made at the interior of the sealed chamber, and proportional to the mass of the casting metal, said sealed chamber having at least one removable extremity for allowing the casting cylinder to be introduced and, subsequently, to be taken out, and for allowing the next casting to be prepared.
  • Said means for the connection to the inert gas reservoir and to the vacuum source may consist, according to the present invention, of a closing and opening valve or of a copper pipe, arranged between an opening made in the sealed chamber and the inert gas reservoir and the vacuum source, which pipe is cut, by crushing its extremities, after having realized the decontamination, so hermetically closing the device itself.
  • said sealed chamber has an upper portion which is removable by threading or other analogous systems.
  • the sealed chamber may have the lower portion as the only removable portion, or both portions may be removable, with systems analogous to those mentioned above.
  • said thin sheet is made up of a titanium foil.
  • Said thin sheet may also be made up of a plastic material.
  • the inert gas employed is helium or argon, particularly helium.
  • the device 1 provides a cylindrical chamber 2, at the interior of which the casting cylinder is placed, which chamber is hermetically closed and endowed on the upper side with a small connection tube 3 endowed with an opening and closing valve 4.
  • the lower wall of the chamber 2 consists of a thin sheet 5 of titanium, or of an other non-contaminating plastic or metallic material, of such a thickness as to melt, at the interior of the casting chamber of the casting machine, owing to the metal poured from the crucible, and, moreover, as to withstand the vacuum made at the interior of the chamber 2.
  • the device 1 is realized with the lower portion 6 which is unscrewable with respect to the main body 7, so that the foil 5 may be replaced and the device reemployed.
  • the upper portion 8 is also unscrewable with respect to the main body 7.
  • the device 1 may be also realized with the body 7 and the lower portion 6 which are integral to each other. In this case, the whole assembly body 7, the lower portion 6, and the thin sheet or foil 5 must be replaced to employ the device itself again.
  • the matings between the body 7 and the lower portion 6 and the upper portion 8, realized in such a way, as to insure an absolute seal, may also be realized in a different way with respect to the interthreading system shown in the figure.
  • valves 12 and 13 are provided for excluding either or both of them during the preparation cycle.
  • a pressure gauge 14 is provided on the tube 9.
  • the small tube 3 is attached to the tube 9 and the valve 4 is opened. Then an inert gas, preferably helium, is let into chamber 2, and then a vacuum is made.
  • an inert gas preferably helium
  • valve 4 is closed.
  • the chamber 2 with the casting cylinder is now in a decontaminated environment under vacuum, at the interior of which an optimum casting is obtained.
  • the device 1 is then ready for being placed into the casting machines.
  • the device 1 according to the present invention may be connected to the inert gas reservoir and to the vacuum source by means of a copper tube provided on an opening of chamber 2 (which opening is realized in place of valve 4).
  • the closing and opening valve will be provided on the inert gas delivering and vacuum-making facility.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Furnace Details (AREA)

Claims (12)

  1. Vorrichtung zum Dekontamination einer Giesskokille, insbesondere zum Giessen von Titan und olrgl., dadurch gekennzeichnet, dass die Vorrichtung eine dicht gesohlossene Kammer (2) enthaelt, in der die Giesskokille angeordnet its und die an ihrer Oberseite mit Verbindungsmitteln (3,4) zur Verbindung mit einem Inertgasbehalter und mit einer Vakuumquelle und an ihrer Unterseite mit einer duennen Folie (5), die aus einem das zu giessende Metalschmelze nicht kontaminierenden Material besteht und eine zum Aushalten des im Inneren der Kammer (2) herschenden, Vakuums genuegende und zur Giessmasse des Titans proportionale Dicke hat, wobei mindestens ein Ende der Kammer (2) abnehmbar ist, um das Einfuehren und Abfuehren der Giesskokille sowie die Vorbereitung des naechsten Giessvorganges zu gestatten.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die vorgenannten Mittel (3,4) zur Verbindung mit dem Inertgasbehaelter und mit der Vakuumquelle aus einem ein- und ausschaltbaren Ventil (4) bestehen.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die vorgenannten Mittel (3,4) zur Verbindung mit dem Inertgasbehalter und mit der Vakuumquelle aus einem Kupferrohr (3) bestehen, dessen ein Ende an eine Oeffnung der Dichtkammer (2) angeschlossen und das andere Ende mit dem Inertgasbehaelter und der Vakuumquelle verbunden ist, wobei das Kupferrohr nach der Dekontamination abgeschnitten wird, um somit die Dichtkammer dicht zu schliessen.
  4. Vorrichtung nach je einem der Ansprueche 1 bis 3, dadurch gekennzeichnet, dass der Oberteil (8) der Dicktkammer (2) abnehmbar ist.
  5. Vorrichtung nach je einem der Ansprueche 1 bis 3, dadurch gekennzeichnet, dass die Dichtkammer einen abnehmbaren unteren Teil hat.
  6. Vorrichtung nach je einem den Ansprueche 1 bis 3, dadurch gekennzeichent, dass die beiden Unter- und Oberteil (6 bzsw. 8) der Dichtkammer abnehmbar sind.
  7. Vorrichtung nach je einem der Ansprueche 2 bis 6, bei der die vorgenannten Unter- und Oberteil (6 bzsw. 8) mit der Dichtkammer (2) durch Verschraubung gekuppelt sind.
  8. Vorrichtung nach je einem der Ansprueche 2 bis 6, bei der die vorgenannten Unter- und Oberteil (6 bzsw. 8) mit der vorgenannten Dichtkammer (2) durch eine dichtende Rastkupplung verbunden sind.
  9. Vorrichtung nach je einem der Ansprueche 2 bis 6, dadurch gekennzeichnet, dass die duenne Folie (5) eine Titanfolie ist .
  10. Vorrichtung nach je einem der Ansprueche 1 bis 8, dadurch gekennzeichnet, dass die genannten Folie (5) aus einem Kunststoff besteht.
  11. Vorrichtung nach je einem der vorhergehenden Ansprueche, dadurch gekennzeichnet, dass das vorgenannte Inertgas Helium ist.
  12. Vorrichtung nach je einem der Anspruech 1 bis 10, dadurch gegenzeichnet, dass das vorgenannte Inertgas Argon ist.
EP90830318A 1989-07-18 1990-07-10 Vorrichtung zum Dekontaminieren einer Giesskokille, die insbesondere für Titan und dergleichen verwendet wurde Expired - Lifetime EP0409805B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8948199A IT1231483B (it) 1989-07-18 1989-07-18 Dispositivo per la decontaminazione di uno stampo di fusione, in particolare per fusioni di titanio e simili
IT4819989 1989-07-18

Publications (2)

Publication Number Publication Date
EP0409805A1 EP0409805A1 (de) 1991-01-23
EP0409805B1 true EP0409805B1 (de) 1993-11-10

Family

ID=11265165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830318A Expired - Lifetime EP0409805B1 (de) 1989-07-18 1990-07-10 Vorrichtung zum Dekontaminieren einer Giesskokille, die insbesondere für Titan und dergleichen verwendet wurde

Country Status (4)

Country Link
EP (1) EP0409805B1 (de)
JP (1) JP3070933B2 (de)
DE (1) DE69004512T2 (de)
IT (1) IT1231483B (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682458A (en) * 1969-12-29 1972-08-08 Trw Inc Melting of refractory and reactive metals
US4007772A (en) * 1974-11-06 1977-02-15 Laedtke Donald O Apparatus for vacuum precision casting
GB2170742B (en) * 1985-01-31 1988-04-07 Maio Spa Mario Di Apparatus for use in producing castings by the }lost-wax} method

Also Published As

Publication number Publication date
JP3070933B2 (ja) 2000-07-31
IT1231483B (it) 1991-12-07
DE69004512D1 (de) 1993-12-16
JPH03174969A (ja) 1991-07-30
DE69004512T2 (de) 1994-04-21
EP0409805A1 (de) 1991-01-23
IT8948199A0 (it) 1989-07-18

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