Ingot mould for continuous casting

Details Ingot mould for continuous casting Ingot mould for continuous casting

1996-10-29

1998-02-10

Lin, Kuang Y.

Metal founding

Including vibrator means

In continuous casting mold

164418, B22D 1104

Patent

active

057158886

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to an ingot mould for a continuous casting plant.
In such an ingot mould for continuous casting, an ingot mould tube, serving as a flow channel for the molten metal, is vigorously cooled by a cooling circuit incorporated in the body of the ingot mould. 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. Now, the attachment or sticking of this peripheral crust to the inner wall of the ingot mould tube would risk tearing the crust. In order to prevent such an attachment or sticking of this peripheral crust to the inner wall with its harmful consequences, it is known that the ingot mould should be subjected to an oscillatory movement along the casting axis.
For this purpose, it is known how to support the ingot mould on an oscillating table, which is connected through one or more levers to a device for generating mechanical oscillations. The oscillation generating device and the lever or levers, which are quite bulky, are mounted below the oscillating table, laterally with respect to the casting axis. The presence of the oscillating table and the levers not only causes a problem as regards the available space, but it also increases the inertial mass to be set into oscillatory motion.
In order to understand the problems inherent in a device for setting an ingot mould for continuous casting into oscillation, it should be noted 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 weight which is easily of the order of 3 tonnes. It is necessary to be able to confer on this weight oscillations with an amplitude of a few millimeters, and with a frequency of the order of 5 Hz or higher. Now, the device generating the mechanical oscillations not only has to overcome the inertia of the ingot mould itself, but also has to deal with the inertia of the supporting mechanism (for example, the levers and oscillating table), as well as the frictional forces between the inner wall of the ingot mould tube and the molten metal. The greater the inertial masses, the greater the power needed to produce the oscillations of the ingot mould and the greater the stresses on the lever mechanism used to transmit the oscillatory motion to the ingot mould. The articulated joints of the transmission levers are particularly weak points, in view of the fact that they have to transmit large forces, while being subjected to relative movements of small angular amplitude but high frequency.
In order to overcome the aforesaid disadvantages, it has been proposed that the ingot mould should be supported in a supporting structure using peripheral leaf springs, thus creating a harmonic oscillator whose mass corresponds to that of the ingot mould. In order to produce forced oscillations in such a mechanical system, it is of course 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. Thus, it has been proposed, for example, that the forced oscillations of an elastically supported ingot mould should be produced using a low power hydraulic cylinder which is mounted laterally between the ingot mould and its supporting structure. The axial guidance of the oscillatory motion and the compensation for the off-axis nature of the excitation force produced by the hydraulic cylinder are then achieved by an elaborate dimensioning of the various leaf springs. In practice, the dimensioning and positioning of the peripheral leaf springs, which must support the great weight of the ingot mould while giving the system the required elastic characteristic, may however pose problems. Moreover, the supporting structure, which surrounds the ingot mould and supports it through the intermediary of the said peripheral leaf springs, takes up considerable space around th

REFERENCES:
patent: 4483385 (1984-11-01), Kurzinski
patent: 4669525 (1987-06-01), Kurzinski

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