Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1996-04-04
1998-03-31
Hail, III, Joseph J.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164439, 249105, 249109, B22D 1100
Patent
active
057327637
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is a 371 of PCT/FR94/00570 filed May 11, 1994.
BACKGROUND OF THE INVENTION
The present invention relates to the casting of molten metals, and more particularly to the vertical continuous casting of metal castings, especially of cast-iron pipes. Although it applies to the casting of various types of metal castings, it is particularly advantageous for the casting of thin cast-iron pipes. The expression "thin pipe" applies to a pipe whose thickness/diameter ratio is low, less than ten per cent, rather than to the thickness considered in isolation by itself.
More specifically, the invention relates to a device for feeding a casting machine with molten metal, especially for an installation for the ascending vertical continuous casting of cast-iron pipes, the said feed device being arranged between a source of molten metal and the casting machine. The source of molten metal is typically a pouring ladle of cast iron and the casting machine a machine for the ascending continuous casting of metal castings, of the vertical-die type. The invention therefore relates to an intermediate link of a casting installation, arranged between the source of molten metal and the device for casting the metal castings as such.
The document FR-A-2,547,517 relating to a vertical continuous casting installation having a die and hot inlet for the casting of metal pipes has already described a liquid cast-iron feed device arranged between a pouring ladle and a vertical die. This feed device includes a syphon unit consisting of a one-piece component made in a refractory material of the alumino-silicate type or made of graphite. This syphon unit includes a vertical duct surmounted by a funnel for receiving the cast iron and a horizontal runner connected up in a sealed manner to the lower end of the die for which it acts as a sole-plate or support.
This syphon unit according to the state of the art raises a certain number of problems. In fact, given the high temperatures involved in the casting of molten metals, the syphon unit is rapidly damaged during the continuous-casting process. In particular, a syphon made of graphite, over and above its relatively high cost, is gradually worn away and/or consumed by the molten cast iron which is in contact with it. Furthermore, a one-piece syphon unit is a relatively bulky component which is difficult to employ, which also complicates the handling necessary when replacing the syphon. The consumption of the graphite may cause modification of the composition of the cast iron, outside the desired analysis.
SUMMARY OF THE INVENTION
The object of the present invention is to remedy the drawbacks exhibited by the known molten-metal feed devices, and in particular by the syphon units as known in the state of the art.
The subject of the invention is consequently a device for feeding a casting machine with molten metal, especially for an installation for the ascending vertical continuous casting of cast-iron pipes, the said feed device being arranged between a source of molten metal and the casting machine, this device being characterized in that it has a modular structure including, on the one hand, a syphon for conveying the molten metal from the source of metal to the casting machine and, on the other hand, removable plates for heating the syphon which are arranged around the latter and in contact with it.
According to other characteristics of the invention: refractory concrete; substantially vertical channel terminated near the top by an inlet orifice for the molten metal, a second substantially vertical channel emerging at the base of the casting machine via an outlet orifice for the molten metal, and a substantially horizontal channel connecting the vertical channels together; to interact, using a seal, with the matching base of the casting machine; surrounding the syphon and the heating plates so as to leave free a space between the inside of the shell and the heating plates, the said space being filled with a thermally insulating and chem
REFERENCES:
patent: 4632174 (1986-12-01), Pierrel
Gallo, deceased Yvon
Rotharnel Claude
Hail III Joseph J.
Lin I.-H.
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