Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1993-08-05
1995-02-28
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164423, B22D 1106
Patent
active
053928385
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to methods and devices which make it possible to obtain threads by casting in a liquid. Such threads are, for instance, metal threads, particularly threads of amorphous alloys.
It is known to produce amorphous threads by projecting a jet of molten alloy into a liquid cooling layer, for instance a layer of water, applied by centrifugal force against the inner wall of a rotary drum. Such methods are described, for instance, in U.S. Pat. Nos. 3,845,805, 4,523,626 and French Patent 2 636 552. The Japanese Patent Application published under No. 63-137550 describes such a method in which use is made of devices at the end of the drum in order to separate a given number of layers of threads. The thread is extracted upon the stopping of the drum, so that this method cannot be used in continuous operation.
In order that a method of centrifugal casting in a drum can be used in continuous operation, it is necessary to have the thread emerge from the drum as it is formed. Various methods have been described for this purpose. It has been proposed, for instance, to use magnetic devices in order to apply the thread against a coil arranged outside the cooling liquid, these devices possibly furthermore employing a radially moving lever which is driven by the drum. Such methods are described, for instance, in U.S. Pat. No. 4,617,983, in the Japanese Patent Application published under No. 62-89526, and in the international application published under No. WO 87/155. These devices are complicated to use and may lead to instabilities of the film of water which are prejudicial to the continuity of the thread. Water and thread evacuation devices have been described, for instance, in the Japanese Patent Applications published under Nos. 60-61147, 60-76255, 60-166147, and 61-253147. These devices are also complicated to use and, furthermore, they raise sealing problems which are difficult to solve.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a method and a device which make it possible continuously to extract in simple manner a thread produced by centrifuging in a drum without sealing problems arising. The method in accordance with the invention for the continuous production of a solid thread by extrusion of a molten material into a cooling liquid applied by centrifugal force against the inner wall of a drum is characterized by the following features: drum, which is in contact with the centrifuged liquid, has a lateral surface which progressively approaches the axis of rotation in the direction towards the outside of the drum; surface in such a manner that the thread then moves away from said surface, emerging from the drum under the action of the centrifugal force.
The invention also concerns a device for the continuous obtaining of a solid thread by extrusion of a molten material into a cooling liquid applied by centrifuging against the inner wall of a drum, the device being characterized by the following features: an axis; the inner wall of the drum, intended to come into contact with the centrifuged liquid, has a lateral surface which progressively approaches the axis of rotation in the direction towards the outside of the drum; surface, said means being so arranged that the thread then moves away from said surface, emerging from the drum under the action of the centrifugal force.
The invention also concerns threads obtained by the method or device previously described.
The invention also concerns articles reinforced with these threads, such articles being, for instance, belts, hoses or tires.
The invention will be easily understood by means of the following non-limitative examples and the diagrammatic figures relating to these examples.
DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a front view of a device according to the invention with a drum rotating around an axis, the view of FIG. 1 being taken in the direction of the arrow F shown in FIG. 2;
FIG. 2 is a cross-sectional view of the device shown in FIG. 1, this section
REFERENCES:
patent: 3845805 (1974-11-01), Kavesh
patent: 4523626 (1985-06-01), Masumoto et al.
patent: 4617983 (1986-10-01), Tsubata et al.
patent: 5000251 (1991-03-01), Bijaoui et al.
Vol. 10, No. 331 (M-533) (2387) 11 Nov. 1986, JP, A, 61 135 457 Sumitomo ctric Ind. Ltd.
Vol. 11, No. 205 (M-603) (2652) 3 Jul. 1987, JP, A, 62 24 843 Sumitomo Electric Ind. Ltd.
Vol. 14, No. 97 (M-940) (4040) 22 Feb. 1990, JP, A, 1 306 054 Unitika Ltd.
WO 87/00155 (1987).
Bijaoui Denis
Roche Jean
Compagnie Generale des Establissements Michelin - Michelin & Cie
Lin Kuang Y.
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