EP0429117B1 - Machine à couler des corps en alliages non-ferreux par centrifugation - Google Patents

Machine à couler des corps en alliages non-ferreux par centrifugation Download PDF

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Publication number
EP0429117B1
EP0429117B1 EP90202947A EP90202947A EP0429117B1 EP 0429117 B1 EP0429117 B1 EP 0429117B1 EP 90202947 A EP90202947 A EP 90202947A EP 90202947 A EP90202947 A EP 90202947A EP 0429117 B1 EP0429117 B1 EP 0429117B1
Authority
EP
European Patent Office
Prior art keywords
machine
mold
crucible
sleeve
molten metal
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
EP90202947A
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German (de)
English (en)
Other versions
EP0429117A1 (fr
Inventor
Primo Righeschi
Francesco Zumbo
Sergio Pisotti
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.)
CABE SpA
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CABE SpA
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Publication date
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Publication of EP0429117A1 publication Critical patent/EP0429117A1/fr
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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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/107—Means for feeding molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/04—Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry

Definitions

  • the present invention relates to a machine for producing centrifuged castings of nonferrous alloys such as articles of costume jewelry, pewter and small metal parts, buckles, buttons and the like.
  • CH-A-311310 it is known a machine and a process for feeding a continuous flow of molten metal from a reservoir to a centrifugal metal mold, through a coaxial channel, with the molten metal being supplied upwardly by means of pressure or vacuum.
  • Patent Abstracts of Japan, Vol. 7, No. 50 (M-197)(1195) & JP-A-57 199 557 discloses a devices for centrifugal casting employing a pressurized injection of molten metal at the center of a metal mold.
  • the present invention concerns a machine, also known in the art as automatic casting complex, and that allows for the manufacture of the above mentioned articles and other, through the melting and the casting in suitable rotating dies or molds of nonferrous metals, such as tin, zinc, lead and the like.
  • the molds of such machines are built of casting rubbers, e.g. silicon rubber for zinc and tin/lead alloys, or natural or synthetic rubbers for tin/lead alloys.
  • casting rubbers e.g. silicon rubber for zinc and tin/lead alloys, or natural or synthetic rubbers for tin/lead alloys.
  • the feeding takes place by means of a cup or ladle actuated by an ascent-descent cylinder that is dipped into the crucible and then raised up to a pouring zone wherein the melted metal is tapped through a gate of the ladle and poured into the metal pouring spout.
  • Suitable fixtures and dishes are provided in the base allowing for the loading and the rotation of one, two or more molds that are then unloaded in turn at the end of a production run.
  • the devices of the above mentioned type exhibit a number of shortcomings and drawbacks.
  • the crucible is housed at a considerable height (about 1.7 meters) above the floor and therefore the (rather frequent) loading operation is quite inconvenient for the operator, besides the fact that the machine as a whole has a considerable height.
  • the liquid metal undergoes a partial oxidation when contacting the air of the pouring pipe and reaches the casting molds 2-3 seconds after being drawn from the crucible, thus cooling and reducing its flowability.
  • the articles so obtained tend to exhibit a low molecular coesion which results in surfaces being rough and porous.
  • alloys containing larger amounts of metals that favours the flowability and the casting quality and such metals appreciably raise the cost of the alloy.
  • An object of the present invention is to overcome the above mentioned drawbacks and shortcomings of the known machines, and more particularly to realize a machine that is easy to be used and able to improve the surface quality and the mechanical characteristics of the casted articles even when cheaper alloys are employed.
  • the machine comprises a support base on which two or more conventional multiple-impression molds 2 are positioned.
  • Each multiple-impression mold is made of rubber and comprises a number of cavities (impressions) radially arranged around a central feeding channel.
  • the mold is rotated by a rotary cylinder 3 housed within the base 1 and such rotation of the mold can be obtained in known manners by means of electromechanical, pneumatic or hydraulic devices (not shown).
  • the molds 2 could be of the static type either a one-piece or made up by more pieces to be assembled together, and of various materials. Preferably the molds are positioned between two metal pressure discs.
  • the liquid metal alloy 6 is stored in a crucible 7, e.g. of cast iron, provided with a conventional heating means that has not been illustrated for simplicity sake.
  • the crucible heating means can be electrical, gas burning, gas oil burning, fuel oil burning, etc.
  • the crucible 7 is substantially at the same height of the mold 2, so that gravity is not used for the transfer of the melted metal into the mold.
  • the crucible can be located at a height lower than the mold.
  • the crucible is furter provided with a feeding device that will be described hereinbelow with more details.
  • connection between the crucible 7 and the mold(s) 2 is realized by a feeding conduit or pipe 5 tht is substantially horizontal, and in case slightly inclined upwards from the crucible to the mold, as shown in Fig. 1.
  • the feeding device for the melted metal comprises a sleeve or cylinder 8 at least partially sunk in the liquid bath 6, and a reciprocating plunger 9 within such sleeve 8 driven by an actuator 10, e.g. a pneumatic or hydraulic piston.
  • an actuator 10 e.g. a pneumatic or hydraulic piston.
  • the sleeve 8 has an inner siphon structure that is better shown in Fig. 2. It provides for a main cylindrical cavity 11 within which the plunger 9 slides, this latter carrying steel sealing rings 16 and 17.
  • a side opening or gate 12 is realized in the sleeve below the surface of the melted metal, so that the melted metal can reach the main cavity 11 when the plunger is raised above the gate 12.
  • a channel 13 extends parallel to the cylindric cavity 11, the channel having a cross section area smaller than that of the cavity and being connected at one end with the feeding conduit 5, whereas at the other end it communicates with the cylindric cavity through a passage 14.
  • the machine can work according to an operating cycle that is repeatedly carried out, even under automatic control, with the automatic positioning of the molds on a suitably shaped and dimensioned table that is moved by a device applying a linear, swinging, reciprocating or rotating motion.
  • the machine of the invention achieves a very quick transfer of the melted metal, in the order of 0.3-0.7 seconds, thus reducing the heat loss and allowing for a lower temperature of the bath in the crucible with consequent reduction of the power consumption and an increase of the crucible life.
  • the quality of the casted article is improved since:
  • the crucible is substantially at the same height of the mold and easy to be refilled, while the feeding conduit is fas from the critical areas of the machine, being substantially external.

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

Claims (5)

  1. Une machine pour le moulage centrifuge d'alliages non ferreux tels que des articles décoratifs pour les vêtements, des pièces d'étain et de petites pièces métalliques, du type comprenant une embase de support (1) logeant au moins un moule en élastomère (2), comportant des moyens (3) pour faire tourner ledit moule (2) autour d'un axe sensiblement vertical, et un creuset (7) relié à ladite machine (2) par un conduit sensiblement horizontal (5) permettant de fournir par le dessus une quantité prédéterminée de métal fondu audit moule (2), caractérisé par un dispositif pour fournir ladite quantité prédéterminée de métal fondu, et comprenant:
    - un manchon (8), au moins partiellement plongé dans le bain liquide (6) dudit creuset, à l'intérieur duquel manchon un piston plongeur (9) est susceptible de se déplacer alternativement, de façon étanche,
    - au moins une ouverture latérale (12) dans ledit manchon (8), en communication avec le métal fondu dudit creuset et,
    - une ouverture de sortie (15) reliée audit conduit (5) pour fournir ladite quantité prédéterminée de métal fondu au moule (2), ledit creuset (7) étant sensiblement à la même hauteur du moule (2),
    - ledit manchon (8) comportant un trajet en siphon comprenant une cavité cylindrique (11) à l'intérieur de laquelle ledit piston plongeur (9) est susceptible de se déplacer, et un canal (13), parallèle à ladite cavité, et présentant une section transversale inférieure à celle de ladite cavité, et communiquant avec ladite cavité par un passage (14).
  2. Une machine selon la revendication 1, caractérisée en ce que ledit creuset (7) et ledit moule (2) sont disposés sensiblement à la même hauteur.
  3. Une machine selon la revendication 1 ou 2, caractérisée en ce qu'un organe d'actionnement (10) est prévu pour entraîner en déplacement alternatif ledit piston plongeur (9).
  4. Une machine selon la revendications 3, caractérisée en ce que ledit organe d'actionnement (10) est un vérin pneumatique.
  5. Une machine selon la revendication 3, caractérisée en ce que ledit organe d'actionnement (10) est un vérin hydraulique.
EP90202947A 1989-11-16 1990-11-07 Machine à couler des corps en alliages non-ferreux par centrifugation Expired - Lifetime EP0429117B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2240889 1989-11-16
IT02240889A IT1237777B (it) 1989-11-16 1989-11-16 Macchina per la produzione di getti centrifugati in leghe non ferrose e relativo procedimento.

Publications (2)

Publication Number Publication Date
EP0429117A1 EP0429117A1 (fr) 1991-05-29
EP0429117B1 true EP0429117B1 (fr) 1996-02-28

Family

ID=11195913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202947A Expired - Lifetime EP0429117B1 (fr) 1989-11-16 1990-11-07 Machine à couler des corps en alliages non-ferreux par centrifugation

Country Status (4)

Country Link
EP (1) EP0429117B1 (fr)
DE (1) DE69025549T2 (fr)
ES (1) ES2086363T3 (fr)
IT (1) IT1237777B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1070346Y (es) * 2009-05-27 2009-11-02 Com Nicem Exinte S A Coniex Dispositivo alimentador de metal fundido para maquinas centrifugadoras
KR101755844B1 (ko) * 2015-09-15 2017-07-10 현대자동차주식회사 원심 주조용 용탕 주입기 및 이를 이용한 원심 주조기

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH311310A (fr) * 1952-06-12 1955-11-30 Bunford Max Adolphe Procédé d'alimentation d'un moule rotatif pour la fabrication d'objets moulés par centrifugation et dispositif pour la mise en oeuvre dudit procédé.
FR1586466A (fr) * 1968-09-04 1970-02-20
US4034800A (en) * 1974-08-16 1977-07-12 Alexandr Mikhailovich Pavlov Centrifugal plant for producing bimetallic sleeves

Also Published As

Publication number Publication date
DE69025549D1 (de) 1996-04-04
IT8922408A0 (it) 1989-11-16
ES2086363T3 (es) 1996-07-01
EP0429117A1 (fr) 1991-05-29
IT1237777B (it) 1993-06-17
DE69025549T2 (de) 1996-10-10

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