Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1998-02-11
2000-07-04
Kastler, Scott
Dispensing
Molten metal dispensing
Flow controllers or assists
222591, B22D 4108
Patent
active
060825995
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a plate--internal nozzle assembly for a distributor, the plate being designed to be applied against a support in which there is an orifice.
In continuous steel pouring, a slide shutter is frequently used to control the steel flow between the distributor and one and several continuous pour molds. A slide shutter contains at least one fixed refractory plate installed under a support plate and at least one metal plate free to move with respect to the fixed plate. Each of these plates has at least one hole to allow the steel to pass. The upper plate is used with an internal nozzle that passes through the support plate and the bottom of the distributor. P At the end of the pour sequence, the slag that floats on the steel surface has to be prevented from entering into the mold. This is why the steel shutter is closed when there is still a certain amount of liquid steel, called the skull, in the distributor. This skull cools and solidifies.
Due to the gradual opening up of the hole in the internal nozzle by erosion, the lower end of the solidified steel rod that forms inside the pouring channel up to the mobile plate is in the shape of an elephant's foot which anchors the skull into the fixed plate of the slide shutter. When the distributor is fitted with several pour lines, each line leads to the formation of a skull anchored in the distributor. When the distributor is turned over, the steel rod(s) have to be broken so that the skull can be separated from the distributor. The internal nozzle must be pushed inside the distributor with the skull. This problem is aggravated when there are several pour lines because the steel contracts while it cools, such that the solidified steel rods tend to move towards each other. Since these rods are cast into the distributor wall, they apply pressure on the part of the distributor located between them.
Furthermore, the fixed plate and the internal nozzle are frequently assembled in a metal casing that seals the nozzle when a neutral gas is injected into the pour channel, and facilitates their manipulation during assembly. The presence of this metal casing reinforces the plate and internal nozzle assembly. It is very difficult to destroy the fixed plate and the internal nozzle when the skull is pushed towards the inside of the distributor, because this means extruding the metal casing through the orifice provided in the support on which the fixed plate is applied.
The purpose of this invention is to make a plate-internal nozzle assembly which solves this problem.
In accordance with the invention, the plate and nozzle assembly includes a central area facing the support orifice and a peripheral area applied on the support, the central area and the peripheral area being joined by a connection that is mechanically weaker than either the central area or peripheral area of the assembly such that the central area can be separated from the peripheral area by applying a small force.
According to a first embodiment, a metal casing surrounds the central area and the peripheral area, and the casing includes a weakened area, particularly by punching or notching. As an alternative the casing consists of two separate parts, namely one part partially surrounding the peripheral area and one part partially surrounding the central area.
In the second embodiment, a metal casing partially surrounds the internal nozzle, and a hoop encircles the plate.
In a specific embodiment the internal nozzle contains an outside cylindrical or slightly tapered wall, this wall being surrounded by a metal casing.
In another specific embodiment, the plate contains an insert located in the central part of the plate in which the outside diameter is smaller than the diameter provided in the support plate.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of this invention will become clear when reading the following description of example embodiments given for illustration purposes with the reference to the figures in the appendix.
ON THESE FIGURES:
FIG. 1 is a sect
REFERENCES:
patent: 3731912 (1973-05-01), Kutzer
patent: 4091971 (1978-05-01), Tinnes et al.
patent: 4566925 (1986-01-01), Schnabel et al.
patent: 4708327 (1987-11-01), Waltenspuhl
patent: 5044533 (1991-09-01), King
patent: 5118743 (1992-06-01), Yonezu et al.
patent: 5431374 (1995-07-01), Janssen et al.
Cole Thomas W.
Kastler Scott
Vesuvius France SA
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