Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1997-05-22
1998-12-22
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164461, 427431, 4274345, 427436, B22D 1900, B22D 1100
Patent
active
058508694
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to an inversion casting device with a crystallizer which has a slit-shaped passage for guiding a substrate strip, this passage being arranged in the base and provided with a seal, and which communicates with a melt feed.
2. Discussion of the Prior Art
In inversion casting, a purified metal profile, not cooled, with a low heat content is guided through molten metal in a melt vessel. Upon contact with the metal wire or metal strand, the molten metal crystallizes on the relatively cool metal profile. The crystallization thickness depends on the duration of contact and on the temperatures of the metal profile and metal melt.
In an inversion casting device known from U.S. Pat. No. 3,466,186, a wire is drawn through a vessel filled with molten metal. The vessel has a sealable passage in the bottom region. The melt is fed to the vessel in the vicinity of the surface of the bath. In a special embodiment, the wire provided for crystallization is enclosed by a sleeve having passages in the base region of the melt vessel, through which liquid metal is supplied to the wire. Further, a process for producing thin metal strands is known from European reference EP 0 311 602 B1 in which the substrate strip is likewise drawn upward through the bottom of a melt vessel in the vertical direction through the liquid melt. In both of these references, the wire or strip is guided through the immobile bath of molten metal. Contact between the substrate element and the melt results in an irregular flow profile not subject to outside influence. Depending on this unfavorable flow profile, an irregular temperature distribution can come about, particularly as regards inversion casting of strips.
SUMMARY OF THE INVENTION
The object of the invention is to provide a crystallization device for strips of accurate dimensions in which the relative velocity of the strand and of the liquid steel in the vicinity of the strand is slow so that the metal accumulates at a constant rate and in which the liquid steel located in the crystallizer has a uniform temperature distribution.
The inversion casting device according to the invention has a crystallizer in which a collecting tank is provided that passes about the vessel horizontally in the vicinity of the base. Nozzles lead from the collecting tank to the interior of the vessel. The nozzle orifices are arranged so that the out-flowing melt strikes the substrate strip at an angle of less than 30.degree. in the strip take-off direction. As a result of the liquid metal flowing out of the nozzles, a velocity profile is formed which can be adjusted so that the liquid has the same velocity as the substrate strip. Downstream, the bath movement in the vicinity of the substrate strip is no longer caused by the metal flowing out of the nozzles, but by the substrate strip itself. The liquid metal moving at the same speed as the substrate strip has the possibility of crystallizing at a relative speed of close to 0. A uniform temperature distribution of the melt is achieved by means of the managed supply of molten metal via the nozzles. Damage, especially a melting on or fusing of the substrate strip, is prevented by means of this dependable temperature management. The prevention of a relative speed and the uniform temperature distribution lead to a constant increase in thickness over the width of the substrate strip. The proposed crystallizer has geometrically simple shapes and is resistant to wear due to its shape which is adapted to the flow ratios of the liquid metal.
The nozzles are slit-shaped or tubular and are guided in such a way that the angle of inclination between them and the substrate strip is less than 30.degree.. The selection of the angle of inclination and the proposed shapes allow for a stable refractory structure having adequate room for the unimpeded entry of the metal flow.
The suggested thickness/length ratio of the cross-section of the slit-shaped nozzles is 1/10 to 1/30 and the tubular nozzles have a sug
REFERENCES:
patent: 3561399 (1971-02-01), Federman
El Gammal Tarek
Hamacher Peter Lorenz
Menne Ulrich
Parschat Lothar
Pleschiutschnigg Fritz-Peter
Lin Kuang Y.
Mannesmann Aktiengesellschaft
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