Metal founding – Including vibrator means – In continuous casting mold
Patent
1996-02-28
1997-10-14
Lin, Kuang Y.
Metal founding
Including vibrator means
In continuous casting mold
164478, B22D 1104
Patent
active
056761945
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an ingot mould for a continuous casting plant.
Such an ingot mould for continuous casting comprises an ingot mould tube defining an axial flow channel for a molten metal and an ingot mould body surrounding the ingot mould tube over at least a part of its length. This ingot mould body contains a cooling circuit for the ingot mould body.
In an ingot mould for continuous casting in operation, the ingot mould tube is vigorously cooled by the cooling circuit incorporated in the ingot mould body. In this way, the molten metal solidifies in contact with the inner wall of the ingot mould tube so as to form a peripheral crust. It is to be noted that an attachment or sticking of this solidified peripheral crust to the inner wall of the ingot mould tube would cause the peripheral crust to tear. In order to avoid this risk, it is known that the ingot mould should be subjected to an oscillatory movement along the casting axis.
In order to produce such an oscillatory movement, it is known how to support the ingot mould on a supporting structure, called an oscillating table, which is fitted with a device for generating mechanical oscillations. This oscillating table then transmits to the ingot mould an oscillatory movement directed along the casting axis.
In order to understand the problems inherent in such plant, it should be pointed out that an ingot mould for casting steel billets has--with its ingot mould tube, its ingot mould body, its cooling circuit filled with cooling liquid and possibly an electromagnetic inductor to agitate the molten metal--a mass which is easily of the order of 3 tonnes. It is necessary to be able to confer on this mass oscillations with an amplitude of a few millimeters, and with a frequency of the order of 5 Hz and higher. It is hence necessary to use a device for generating mechanical oscillations which is very powerful, all the more so because this device has to overcome not only the inertia of the ingot mould itself, but also the inertia of the structure of the supporting structure as well as the frictional forces between the inner wall of the ingot mould tube and the molten metal. The high powers involved in producing the oscillations of the ingot mould have harmful effects such as noisy impacts and vibrations detrimental to the mechanical characteristics of certain elements of the ingot mould.
It has also been proposed to support the ingot mould in a support using springs, thus creating a damped harmonic oscillator whose mass corresponds to the mass of the ingot mould. In order to produce forced oscillations in such a mechanical system, it is sufficient to apply to the ingot mould a much smaller force, since it is possible to take advantage of the resonance phenomenon at the natural frequency of the system. In practice, the implementation of such a method may, however, pose problems of dimensioning and positioning of the springs. The latter must in effect support the great weight of the ingot mould while giving the system the required elastic characteristic.
The aim of the present invention is to propose an ingot mould which confronts the mechanical oscillation generating device with a considerably reduced mass.
This aim is achieved by an ingot mould for a continuous casting plant which comprises: wall defining an axial flow channel for a molten metal; over at least part of its length so as to define with the latter a sealed chamber containing a circuit for cooling the ingot mould tube; and mould body; of sealing elements allowing an axial movement of the ingot mould tube with respect to the ingot mould body, while providing for the sealing of the said sealed chamber; and to the ingot mould tube so that it is capable of transmitting to the latter an axial oscillatory movement with respect to the ingot mould body.
In an ingot mould according to the invention, the mass in oscillatory motion is substantially reduced to the mass of the ingot mould tube. It will be appreciated that the mass of the ingot mould tube represents hardly more than 5% of the total
REFERENCES:
patent: 4483385 (1984-11-01), Kurzinski
patent: 4669525 (1987-06-01), Kurzinski
Petry Rudy
Rinaldi Michel
Lin Kuang Y.
Paul Wurth S.A.
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