Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – With means to discharge molten material
Patent
1992-02-19
1993-08-17
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
With means to discharge molten material
266275, 164440, B22D 1114
Patent
active
052363465
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tundish in which molten metal is stored prior to being fed to the mould passage of a horizontal continuous casting mould. The molten metal is fed to the passage by way of a nozzle in a side wall of the tundish and a closed feed tube connecting the nozzle to the mould passage.
Downstream of the outlet of the mould passage there is a structure for supporting the casting horizontally as it is withdrawn from the mould and whilst it is cooled. This structure is often in the form of a roller table. Clearly, the casting leaving the mould has to have its lower surface aligned with the upper surface of the roller table and, consequently, the position of the longitudinal axis of the mould passage relative to the upper support surface of the roller table depends upon the cross-sectional dimensions of the casting.
If the casting apparatus is to be capable of casting workpieces of different cross-section, then different moulds have to be employed and the moulds have to be raised and lowered with respect to the roller table. It is desirable for the longitudinal axis of the mould passage to be aligned with that of the feed tube and that of the nozzle in the wall of the tundish. Consequently, if the longitudinal axis of the mould passage is raised or lowered, it is usual to attempt to raise or lower the tundish. This can lead to difficulties, bearing in mind that the tundish supports a mass of molten metal.
It is also known for two or more moulds arranged side-by-side to be fed simultaneously from a tundish having two or more nozzles connected to the moulds by separate feed tubes. If the moulds produce castings of different cross-section, then the tundish has to be tipped sideways so that the longitudinal axes of the two mould passages remain at the same height above the run-out table. Tipping of the tundish is most inconvenient and can be dangerous.
An object of the present invention is to provide a tundish which enables moulds of different cross-sections to be employed.
According to the present invention, a tundish for molten metal has a substantially vertical front wall with an opening therethrough; at least two metal plates each having the same outer dimensions which are such as to allow the plates to be fitted one at a time in the opening in the front wall to close off the opening and means for retaining the plate in the opening, each of the plates having an aperture of the same cross-section therethrough but the position of the opening in each plate being different from that in the or each other plate whereby the longitudinal axis of the aperture in each plate, when fitted in the opening in the front wall of the tundish, is at a different vertical height.
The plate is used to secure a refractory nozzle in the side wall of the tundish with the longitudinal axis of the nozzle coincident with the longitudinal axis of the opening in the plate. Consequently, by selecting the appropriate plate, the longitudinal axis of the nozzle is aligned with the longitudinal axis of the mould passage and the two can be connected together by way of a feed tube.
If the tundish has a pair of openings in the front wall, different plates can be selected for each opening so that the longitudinal axis of the opening in one plate, while aligned with the longitudinal axis of the mould which it is feeding, is at a different vertical height from the longitudinal axis of the opening in the other plate and the mould which is being fed through the nozzle and feed tube associated with that plate. Thus, tipping or raising of the tundish is not required.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a front elevation of a tundish; and
FIGS. 2, 3 and 4 are alternative sectional side elevations on the line A--A of FIG. 1.
A tundish for molten metal has a substantially vertical front wall 1 having a pair of identical openings 3 formed side-by-side therethrough. A
REFERENCES:
patent: 3344845 (1967-10-01), Blessinger et al.
Davy McKee (Sheffield) Limited
Kastler Scott
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