US 11,612,931 B2Granted

Electromagnetic stirring device in a mould for casting aluminium or aluminium alloys, stirring method in a mould for casting aluminium or aluminium alloys, mould and casting machine for casting aluminium or aluminium alloys

OwnerSabrina Strolego, Stefano De Monte +2inventors

InventorsSabrina Strolego, Stefano De Monte, Stefano Spagnul, Cristiano Persi

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Abstract

Electromagnetic stirring device in a mould for casting aluminium or aluminium alloys, wherein the electromagnetic stirring device has a winding core of conductive coils intended for the circulation of a current generating an electromagnetic field of stirring of the molten metal inside the mould. A mould, casting machine and casting plant provided with such an electromagnetic stirring device are also provided. A stirring method in a mould for casting aluminium or aluminium alloys is disclosed, including a phase of supply of phase-shifted currents on an electromagnetic stirring device in a mould.

Claims31

Dependent claims

An electromagnetic stirring apparatus for a mold used for casting molten metal of aluminum or aluminum alloys, the electromagnetic stirring apparatus comprising:

a winding core;
at least one winding of a conductor in a conductive coil form adapted to generate an electromagnetic field, said winding core having a toroidal shape and supporting said at least one winding, said at least one winding being wound around said winding core on a winding plane extending in a radial direction with respect to a central axis of the toroidal shape of said winding core, said at least one winding comprising pairs of groups of coils in which each pair of groups of coils comprises two groups of coils in which each of the two groups of coils are reciprocally connected in series, wherein each pair of groups of coils has a first connection end and a second connection end, the second connection end being respectively connected to second ends of another pair of groups of coils at a common connection point, the common connection point being a center of a star connection, the first connection end of each of the pair of groups of coils having a connection interface with a supply system of reciprocally phase-shifted sinusoidal currents with respect to the center of the star connection, a current of each of the pairs of groups of coils being phase-shifted with respect to a current of an adjacent pair of groups of coils along the toroidal shape of the core so as to generate a rotating electromagnetic field for stirring of the molten metal of aluminum or aluminum alloys.

A mold for solidification of a metal bar from molten metal of aluminum or aluminum alloys, the mold comprising:

a lower opening having an opening through which the metal bar is extracted;
an introduction portion opposite to said lower opening, said introduction portion adapted to allow the molten metal to be introduced into the mold;
a solidification starting zone positioned between said lower opening and said introduction portion, said solidification starting zone allowing for the solidification of the molten metal;
an electromagnetic stirring device housed in a seat in the mold, said electromagnetic stirring apparatus having a winding core having a toroidal shape and at least one winding in a form of groups of conductive coils and adapted to circulate a current that generates an electromagnetic field so as to stir the molten metal inside the mold, the winding coil being a supporting element having a winding section with a center around which the at least one winding is wound;
and
a ring adapted to promote the solidification of the molten metal, said ring positioned in said solidification starting zone, said solidification starting zone having a width greater than a width of said introduction portion, said solidification starting zone and said introduction portion being joined to each other by a joint portion, the joint portion having an inclined part joining said solidification starting zone and the introduction portion, wherein the seat houses said electromagnetic stirring apparatus inside the mold such that the center of the winding section is positioned at a distance of approximately ±140 millimeters from one end of said solidification starting zone, the center of the winding section being positioned at approximately ±170 millimeters from an intermediate plane of vertical extension of said ring.

3 more elements

An electromagnetic stirring system for stirring molten metal of aluminum or aluminum alloys, the electromagnetic stirring system comprising:

a mold;
an electromagnetic stirring apparatus positioned in said mold;
a current supply connected to said electromagnetic stirring apparatus, the current supply being at least one winding of conductor wound around a winding core, the winding core having a toroidal shape, the at least one winding being wound in groups of conductive coils that circulate a current that generates an electromagnetic field for the stirring of the molten metal, wherein said current supply has reciprocally phase-shifted sinusoidal supply currents of pairs of groups of coils wound around the core on a winding plane arranged in a radial direction with respect to a central axis of symmetry of the toroidal shape of the core, wherein each pair of groups of coils comprises two groups of coils, one group of the two groups of the coils being wound on the core along a first arc of the toroidal shape of the core and another group of coils of the two groups of coils being wound on the core along a second arc of the toroidal shape of the core, the first arc and the second arc being reciprocally opposite arcs with respect to the central axis of symmetry of the toroidal shape of the core.

Dependencies are inferred from the claim text.

Facts

Application: 17/274,240Filed 28 Aug 2019
Priority: IT 10201800000846510 Sep 2018
Published: US 2021/0354194 A118 Nov 2021
Granted: 28 Mar 2023
Term ends: Not estimatedThe source records don’t support an estimate.