EP0087354A1 - Procédé et appareillage pour le moulage d'alliages métalliques à l'état thixotropique - Google Patents

Procédé et appareillage pour le moulage d'alliages métalliques à l'état thixotropique Download PDF

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Publication number
EP0087354A1
EP0087354A1 EP83400296A EP83400296A EP0087354A1 EP 0087354 A1 EP0087354 A1 EP 0087354A1 EP 83400296 A EP83400296 A EP 83400296A EP 83400296 A EP83400296 A EP 83400296A EP 0087354 A1 EP0087354 A1 EP 0087354A1
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EP
European Patent Office
Prior art keywords
crucible
mold
alloy
stirring
temperature
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.)
Withdrawn
Application number
EP83400296A
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German (de)
English (en)
French (fr)
Inventor
Jean Collot
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.)
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Original Assignee
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
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 Association pour la Recherche et le Developpement des Methodes et Processus Industriels filed Critical Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Publication of EP0087354A1 publication Critical patent/EP0087354A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/06—Centrifugal casting; Casting by using centrifugal force of solid or hollow bodies in moulds rotating around an axis arranged outside the mould
    • B22D13/063—Centrifugal casting; Casting by using centrifugal force of solid or hollow bodies in moulds rotating around an axis arranged outside the mould for dentistry or jewellery
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/90—Rheo-casting

Definitions

  • the invention relates to the molding of metal alloys which have been placed during their preparation in the state of thixotropic suspension.
  • a suspension of this kind is produced by heating a metal alloy to a temperature much higher than the liquidus temperature so that it is completely in the liquid state, then it is stirred while its temperature is left lower to an intermediate value between said liquidus temperature and the solidus temperature.
  • the dendrites which tend to form during this cooling are transformed by agitation into globules of approximately spheroidal shape.
  • the thixotropic metal alloy can be continuously cast in the form of an ingot, or that it can be die-cast in a metal mold under the 'effect of a piston pushed by a cylinder, or that it can be brought to a final desired shape by compression between the two parts of a stamping die.
  • a preparation operation is combined in a new process in a crucible of an alloy in the thixotropic state using a stirring means of mechanical or other type; associated with the crucible is a mold having a cavity which represents the desired part; when the alloy is in the desired state, the mold-crucible assembly is rotated at a speed which causes the transfer of the alloy between the crucible and the mold under the effect of centrifugal force.
  • the mold is heated to the temperature of the alloy using a removable oven which is removed before the rotation of the mold-crucible assembly.
  • the invention also relates to an apparatus allowing the implementation of the process defined above.
  • This apparatus is of the centrifugation type generally called a slingshot comprising a crucible mounted to be driven in rotation about a vertical axis, a mold attached to this crucible at least during rotation; according to the invention, this apparatus comprises a means for agitating the alloy contained in the crucible arranged with a possibility of quick release from the latter; preferably a mobile heating oven is arranged, in addition, to contain the mold and heat it before casting and to be removed from this mold before the rotational drive.
  • Apparatus according to the invention comprises a centrifugal casting machine of the sling type, known per se, which will therefore not be described in detail.
  • a centrifugal casting machine of the sling type, known per se, which will therefore not be described in detail.
  • Such a machine comprises a shaft 1 with a vertical axis coupled in rotation to an electric motor 2.
  • a horizontal plane rotating equipment 3 which has on one side of the shaft 1 a stirrup 4 between the branches of which a crucible 5 is supported by a horizontal transverse shaft 6.
  • Two counterweights 7 rise from the shaft 6 opposite the crucible-5.
  • a mold 8 arranged horizontally with its opening 10 facing the crucible 5.
  • the rotating equipment 3 Opposite the stirrup 4, on the other side of the shaft 1, the rotating equipment 3 comprises a general counterweight 11.
  • the crucible 5 and the mold 8 are arranged so that, when the equipment 3 is rotated by the motor 2, the counterweights 7 tilt outwards and gradually make the crucible 5 take a horizontal position with its opening 12, which was turned upwards, directed towards the mold 8 and being opposite the opening 10 of the latter. At this time, the content of the crucible 5 is transferred to the mold 8. With the crucible 5 is associated, below the rotating equipment 3, an inductor 13 which melts the content of this crucible and which can be retracted towards the down to allow rotation and centrifugal casting described above.
  • thermocouple 14 made retractable relative to the crucible 5 thanks to a pneumatic cylinder 15.
  • the conventional machine which has just been described is commonly used for the centrifugal casting of dental prosthesis parts, at a temperature higher than the liquidus TE temperature.
  • the casting temperature is 1200 ° C. for a liquidus Tt temperature of this alloy of 985 ° C., ie with a difference of 215 ° C. above. of this temperature Tf.
  • Such an alloy has a solidus temperature Ts of 780 ° C.
  • This machine was used to cast this same alloy at a temperature of 930 ° C intermediate between T p and Ts. After melting this alloy at a temperature of 1200 ° C, it was allowed to cool to 930 ° C and, while it was in a pasty state, the centrifugal casting was caused by rotation.
  • Figures 6a, 6b show the open mold 8.
  • the latter's cavity represented the imprint of a dental prosthesis. We can see that it has not been filled. A small amount of metal 16 has come to fill the chimney 17 of the cavity 18, but most of the metal has remained in the crucible 5.
  • the machine described above is equipped with a stirring means 19 comprising at least one stirring element capable of being engaged in the crucible 5 and of being released therefrom easily and quickly.
  • This stirring means 19 comprises a motor 20 with vertical shaft directed downwards and terminated by a clamping mandrel 21 in which the upper end of a rod 22 is held securely.
  • the latter is provided with several elements stirring in silicon nitride.
  • the rod 22 is cast in 3 N 4 in a single piece with two opposite blades 25 which contain between them the lower end part of this rod 22.
  • These blades 25 have a general profile which corresponds to the profile frustoconical interior of the crucible 5. They are traversed outside the rod 22 by numerous holes 26. Preferably, the holes 26 are staggered between one side and the other of the shaft 22; they come from molding with the rod.
  • the motor 20 of the stirring means 19 is itself fixed to the end of the piston rod of an upper cylinder 27 and it is provided laterally with spaced sleeves 28 which surround slides 29. In this way it is possible to make lower the stirring elements 23 or 25 inside the crucible 5 or remove them, easily and quickly when this crucible 5 occupies a determined stop position.
  • the stirring means 19 is supported by supports (not shown) which are external to the rotating equipment 3.
  • a stirring means could be mounted on the latter, between the shaft 1 and the crucible 5 , for example on the upper face of the caliper 4. This would reduce the overall height of the machine but the mass to be driven in rotation would be greater.
  • the rotating equipment 3 has a determined stop position in which an oven 30 can be advanced to almost completely contain the mold 8.
  • the latter is carried between the branches of the stirrup 4 and it extends beyond their ends which are joined by a ring 31.
  • the mold 8 is engaged in the ring 31 and extends beyond the latter.
  • the oven 30 is hollow; it is arranged horizontally with its opening 32 facing the mold 8. It is mounted on a carriage 33 which is itself movable on rails 34 by means of a jack 35 to which it is coupled.
  • the oven 30 is of the type with electrical heating resistances and it is provided with a thermocouple 36 for controlling its internal temperature. In this way, one can advance the oven 30 so that it contains and heats the mold 8 and make it move back to release the latter.
  • the inductor 13 surrounds the crucible 5 to melt the alloy there.
  • the centrifugal casting machine which has been described above with a crucible 8 tilting under the effect of centrifugal force can be produced according to a variant known per se illustrated by FIGS. 5a to 5c.
  • the crucible 5 is not tiltable; it always remains in a vertical position but it has a lateral upper opening 37 at the point of its outer wall furthest from the shaft 1.
  • the mold 8 is attached to the crucible 5 with its opening 10 touched up with the opening 37. During the rotation, the metal rises along the wall of the crucible 5 opposite the shaft 1 and it passes into the mold 8 using opening 37 and inlet 10.
  • the motor 2 rotates the axis 1.
  • the metal flows through the orifice 37 (FIG. 5c).
  • the counterweights 7 tilt it horizontally by centrifugal force and the metal is projected directly from the orifice 12 of the crucible 5 through the inlet of the mold 8 into the chimney 17 of its cavity ( Figure 4c).
  • the blades 25 of the agitator 19 were immersed in the crucible 5 and then rotated; the temperature of the crucible 5 was allowed to drop to the temperature of 930 ° C. while maintaining agitation.
  • the cavity 18 was the imprint of a prosthesis.
  • dental 38 the section of which is shown in FIG. 8. The latter shows that the desired part was complete, completely healthy, and that its structure was not dendritic but composed of numerous globules of approximately spheroidal shape.
  • the invention makes it possible, from a conventional centrifugal molding machine, to provide an improvement which makes this machine suitable for producing cast parts in the thixotropic state, with all the benefits that flow from it.
  • the casting temperature during the second test according to the invention was 270 ° C lower than the conventional casting temperature.
  • the invention shows that, contrary to what was believed until now, the forming of an alloy in the thixotropic state does not require a considerable pressure nor powerful organs as in the die casting in mold closed or stamping in a die.
  • the centrifugal force is sufficient to produce a healthy molded part in an open mold of an alloy in the thixotropic state, at the usual normal speed of rotation for this mode of molding.
  • the stirring means is a mechanical means designed to be removed from the crucible.
  • the invention provides for combining with a centrifugal molding machine an appropriate stirring means which is not necessarily mechanical. Under certain circumstances, heating and maintaining the melting of the alloy by means of the inductor 13 create in this alloy a stirring which is sufficient to put it in the thixotropic state. If necessary, a complementary electromagnetic circuit can be added to the inductor 13 to stir the metal in the semi-liquid semi-solid state and give rise to the thixotropic state.
  • the invention also covers this non-mechanical stirring means.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dental Prosthetics (AREA)
EP83400296A 1982-02-12 1983-02-11 Procédé et appareillage pour le moulage d'alliages métalliques à l'état thixotropique Withdrawn EP0087354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8202344A FR2521465A1 (fr) 1982-02-12 1982-02-12 Procede et appareillage pour le moulage d'alliages metalliques a l'etat thixotropique
FR8202344 1982-02-12

Publications (1)

Publication Number Publication Date
EP0087354A1 true EP0087354A1 (fr) 1983-08-31

Family

ID=9270944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400296A Withdrawn EP0087354A1 (fr) 1982-02-12 1983-02-11 Procédé et appareillage pour le moulage d'alliages métalliques à l'état thixotropique

Country Status (3)

Country Link
US (1) US4510987A (enrdf_load_stackoverflow)
EP (1) EP0087354A1 (enrdf_load_stackoverflow)
FR (1) FR2521465A1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0185287A1 (de) * 1984-12-13 1986-06-25 Rudi Körner Vorrichtung zum Giessen von Zahnersatzmaterialien
EP0195313A1 (de) * 1985-03-18 1986-09-24 Siemens Aktiengesellschaft Vorrichtung zum Verfüllen von evakuierten Hohlräumen in Material bzw. in Körpern
EP0254437A3 (en) * 1986-07-23 1988-06-08 Alumax, Inc. Method of producing shaped metal parts
FR2658745A1 (fr) * 1990-02-28 1991-08-30 Armines Procede et dispositif de moulage d'un alliage metallique.

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8408975D0 (en) * 1984-04-06 1984-05-16 Wood J V Titanium alloys
US4687044A (en) * 1985-05-03 1987-08-18 Tam Ceramics, Inc. Injection method and apparatus
DE4105080C1 (en) * 1991-01-26 1992-10-08 Cerox Technische Keramik Gmbh, 8443 Bogen, De Centrifugal casting device with reduced alloy loss - has inductively heated crucible at an acute angle with horizontal centrifuging plane
GB9201364D0 (en) * 1992-01-22 1992-03-11 British Steel Plc Liquid metal processing
DE4244928C2 (de) * 1992-12-14 1998-08-27 Herbst Bremer Goldschlaegerei Schleudergußvorrichtung und Schmelztiegel für eine Schleudergußvorrichtung
US5911843A (en) * 1995-04-14 1999-06-15 Northwest Aluminum Company Casting, thermal transforming and semi-solid forming aluminum alloys
US5968292A (en) * 1995-04-14 1999-10-19 Northwest Aluminum Casting thermal transforming and semi-solid forming aluminum alloys
US5571346A (en) * 1995-04-14 1996-11-05 Northwest Aluminum Company Casting, thermal transforming and semi-solid forming aluminum alloys
JP3817786B2 (ja) 1995-09-01 2006-09-06 Ｔｋｊ株式会社 合金製品の製造方法及び装置
US5832982A (en) * 1997-01-29 1998-11-10 Williams International Co., L.L.C. Metal forming process
US6135196A (en) * 1998-03-31 2000-10-24 Takata Corporation Method and apparatus for manufacturing metallic parts by injection molding from the semi-solid state
US6540006B2 (en) 1998-03-31 2003-04-01 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US5983976A (en) 1998-03-31 1999-11-16 Takata Corporation Method and apparatus for manufacturing metallic parts by fine die casting
US6474399B2 (en) * 1998-03-31 2002-11-05 Takata Corporation Injection molding method and apparatus with reduced piston leakage
US6502624B1 (en) 2000-04-18 2003-01-07 Williams International Co., L.L.C. Multiproperty metal forming process
US6666258B1 (en) 2000-06-30 2003-12-23 Takata Corporation Method and apparatus for supplying melted material for injection molding
US6432160B1 (en) * 2000-06-01 2002-08-13 Aemp Corporation Method and apparatus for making a thixotropic metal slurry
US6399017B1 (en) 2000-06-01 2002-06-04 Aemp Corporation Method and apparatus for containing and ejecting a thixotropic metal slurry
US6796362B2 (en) * 2000-06-01 2004-09-28 Brunswick Corporation Apparatus for producing a metallic slurry material for use in semi-solid forming of shaped parts
US6742570B2 (en) 2002-05-01 2004-06-01 Takata Corporation Injection molding method and apparatus with base mounted feeder
US6880614B2 (en) * 2003-05-19 2005-04-19 Takata Corporation Vertical injection machine using three chambers
US6951238B2 (en) * 2003-05-19 2005-10-04 Takata Corporation Vertical injection machine using gravity feed
US6945310B2 (en) 2003-05-19 2005-09-20 Takata Corporation Method and apparatus for manufacturing metallic parts by die casting
WO2008049452A1 (en) * 2006-10-23 2008-05-02 Manfred Renkel Apparatus for centrifugal casting
US8245759B2 (en) * 2008-06-06 2012-08-21 GM Global Technology Operations LLC Ladle for molten metal
TWI483763B (zh) * 2013-12-31 2015-05-11 Fusheng Prec Co Ltd 高強度鋼類高爾夫球木桿頭的製造方法
TWI483764B (zh) * 2013-12-31 2015-05-11 Fusheng Prec Co Ltd 低密度鋼類高爾夫球木桿頭的製造方法
TWI483765B (zh) * 2014-01-03 2015-05-11 Fusheng Prec Co Ltd 鑄包異材的高爾夫球桿頭製造方法及其殼模
CN115430819B (zh) * 2022-09-13 2023-09-26 青岛北船管业有限责任公司 一种船用管件提高内壁光滑度的等壁厚离心铸造装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1330525A (fr) * 1962-08-03 1963-06-21 Four centrifuge pour fusion et moulage sous vide
FR2141979A1 (enrdf_load_stackoverflow) * 1971-06-16 1973-01-26 Massachusetts Inst Technology
FR2222157A1 (fr) * 1973-03-23 1974-10-18 Elphiac Sa Installation de fusion et de coulee par centrifugation
FR2277638A1 (fr) * 1974-07-10 1976-02-06 Massachusetts Inst Technology Procede de preparation en continu d'un melange homogene d'une composition metallique en phases liquide et solide

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948650A (en) * 1972-05-31 1976-04-06 Massachusetts Institute Of Technology Composition and methods for preparing liquid-solid alloys for casting and casting methods employing the liquid-solid alloys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1330525A (fr) * 1962-08-03 1963-06-21 Four centrifuge pour fusion et moulage sous vide
FR2141979A1 (enrdf_load_stackoverflow) * 1971-06-16 1973-01-26 Massachusetts Inst Technology
FR2222157A1 (fr) * 1973-03-23 1974-10-18 Elphiac Sa Installation de fusion et de coulee par centrifugation
FR2277638A1 (fr) * 1974-07-10 1976-02-06 Massachusetts Inst Technology Procede de preparation en continu d'un melange homogene d'une composition metallique en phases liquide et solide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ABSTRACT OF NEW TECHNOLOGY FROM THE AIR FORCE SYSTEMS COMMAND, PB 81-970567 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0185287A1 (de) * 1984-12-13 1986-06-25 Rudi Körner Vorrichtung zum Giessen von Zahnersatzmaterialien
EP0195313A1 (de) * 1985-03-18 1986-09-24 Siemens Aktiengesellschaft Vorrichtung zum Verfüllen von evakuierten Hohlräumen in Material bzw. in Körpern
EP0254437A3 (en) * 1986-07-23 1988-06-08 Alumax, Inc. Method of producing shaped metal parts
FR2658745A1 (fr) * 1990-02-28 1991-08-30 Armines Procede et dispositif de moulage d'un alliage metallique.

Also Published As

Publication number Publication date
FR2521465A1 (fr) 1983-08-19
FR2521465B1 (enrdf_load_stackoverflow) 1985-02-08
US4510987A (en) 1985-04-16

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