Abstract:
The invention concerns a method for producing a metal strip, whereby molten is continuously poured between two casting rolls (1, 2) of a strip casting machine with rolls. Above the molten bath (4) and respectively proximate to the molten bath (5) casting rolls (1, 2) transition surface a rotating magnetic field is produced which generates, in the molten metal, local turbulent flows, so that a surface current is formed in said molten metal, which surface current is directed by the casting rolls (1, 2) towards the central plane (E) of the molten bath (4), that is towards the plane for output of the metal strip (8), thereby enabling to largely prevent supernatant impurities at the surface of the molten bath and oxides located on the surface of the rolls from being deposited, and the molten metal particles from being prematurely solidified.
Abstract:
The nozzle includes a chimney whose upper end is connected to the output nozzle of a vessel containing liquid metal and whose lower end is connected to a terminal part of the nozzle provided with outlets for distributing liquid metal into the casting space defined by the mold. The terminal part includes, in its upper region, at least one opening for allowing the reheating of the inside of the terminal part by a burner. The nozzle is particularly adapted for use with a bottomless mold having intensively internally cooled walls, and is preferably made of a refractory material.
Abstract:
Lateral seal of a casting gap formed between two casting rollers of a strip casting machine that can be placed against the casting rollers on the front face. The lateral seal includes a first moist part and a second part that is assigned to the front faces of the casting rollers. The second part forms a type of snout shape encompassing two legs which extend along the front faces of the casting rollers, join each other at the bottom, above a kissing point, so as to form a common area, and between which the first part protrudes from above. An insulating layer which separates the two parts from each other is inserted between the first and second part.
Abstract:
An apparatus serves for the continuous surface cleaning of rotationally movable casting rolls (2, 3) of a strip-casting machine. A plurality of laser beam units (25) are arranged on the circumference of the respective casting roll (2, 3), which laser beam units (25) are arranged next to one another, are distributed over the casting-roll length and by means of which the casting-roll surface (2a, 3a) can be acted upon with one or more laser beams over the entire casting-roll length. Additional cleaning units (30, 31, 35, 45) for the mechanical cleaning of the casting-roll surface are advantageously connected ahead of and/or behind the laser beam units (25). This makes gap-free and regular surface cleaning of the casting rolls possible.
Abstract:
The invention relates to a method for extending the casting cycle for the two-roll strip casting of a steel strip, with in-line rolling thereof, said steel strip being rolled in at least two successive rolling units (1, 2) of a rolling mill comprising replaceable working rolls (5a, 5b, 6a, 6b). The aim of the invention is to be able to carry out the casting process independently from the roll replacement. To this end, the working rolls (6a, 6b) of one rolling unit (2) are replaced during the casting, below or above the steel strip (23). The invention also relates to an installation for carrying out the method, by which means the working rolls (6a, 6b) can be lifted off the steel strip (23) by means of lifting devices (17) so as not to damage the strip during the replacement of the rolls.
Abstract:
Installation for producing steel by melting scrap comprising an electric furnace (2') supplied with individual batches of scrap sequentially charged into the furnace after preheating in a preheating chamber (4) forming a batch container open at both ends and having a releasable bottom. The preheating chamber is mounted on a transporting device for movement between a first, preheating position, in which it is connected to a hot gas circulating circuit, and a second position in which it empties the batch of preheated scrap into the furnace. The lower portion of the side wall of the preheating chamber (4) forms a skirt (43) with a wide downwardly directed opening, and the chamber (4) is combined, in the preheating position, with a movable device (54) for sealably engaging the lower end (42) of the skirt (43) with a matching stationary base plate (3), whereby the skirt is sealed in the preheating position.
Abstract:
The device comprises two parallel horizontal rolls (2a, 2b) delimiting therebetween an inserted volume for the liquid metal (1) to be cast, the ends of the volume being closed by plates (4) with a predetermined clearance between the latter and the surfaces of the rolls against which they are maintained. In order to maintain the clearance constant during successive castings, the plates (4) incorporate rolling members (7) bearing against the end surfaces of the rolls (2a, 2b) and projecting from surfaces of the plates (4) a distance equal to the desired clearance (e). The plates (4) are biased toward the rolls by springs (10) which bear against a frame (2). The rolling members (7) (rollers and/or balls) avoid any wear of the plates and this clearance is automatically maintained by the action of the springs (10) during the casting operations.
Abstract:
A process and apparatus for maintaining the lining of a furnace shell (1) comprising a bottom and a side wall and supported by a floor (2). The shell (1) is composed of two parts adapted to be separated and constituting respectively a bottom (11) and a cooled side wall (12). The side wall (12) is supported directly on a work floor (2) and the bottom (11) on a support (5) movable vertically between an upper operating position of the bottom (11), in line with the side wall (12), and a lower position. After the bottom (11) has been lowered into the lower position, it is moved out of the axis (10) of the furnace to a maintenance station, from which a new bottom (11') is then brought into the lower position, in the axis (10) of the furnace, in order finally to be raised to the upper operating position. The invention applies particularly to arc melting furnaces for steel production.
Abstract:
A mold for hot-top vertical continuous casting of metals includes a feed head (8) made of a thermally insulating refractory material which surmounts a cooled copper crystallizer (9) and is internally aligned with a cooled copper element (14) of the cooled copper crystallizer (9) in order to define a calibrating passage for the cast metal. The copper element (14) is formed by an assembly of plates, some of which, termed “large walls”, are each held against a reinforcing backplate (16) to which it is rigidly fastened by a clamp (22), the shape of which is elongate in the width direction of the large wall and which goes over the top of the large wall and its associated backplate.
Abstract:
Disclosed is a lateral seal of a casting gap formed between two casting rollers of a strip casting machine. Said lateral seal can be placed against the casting rollers on the front face. The inventive lateral seal (10) comprises a first moist part (12) and a second part (13) that is assigned to the front faces of the casting rollers (1, 2). Said second part (13) forms a type of snout shape encompassing two legs which extend along the front faces of the casting rollers, join each other at the bottom, above a kissing point, so as to form a common area, and between which the first part (12) protrudes from above. An insulating layer (18) which separates the two parts (12, 13) from each other is inserted between said first and second part.