Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Reexamination Certificate
1998-12-23
2001-02-27
Batten, Jr., J. Reed (Department: 1722)
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
C164S464000, C164S484000
Reexamination Certificate
active
06192971
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the casting of molten metals, and more particularly the continuous vertical casting of metal parts, in particular pipes, of cast iron. Although it applies to the casting of different types of metal parts, it is particularly advantageous for the casting of thin-walled cast iron pipes. The expression “thin-walled pipes” applies to pipes of small thickness/diameter ratio, less than 10%, rather than the thickness considered by itself in isolation.
The invention relates more particularly to a machine for the continuous vertical casting along a vertical extraction axis of cast iron pipes comprising a die block aligned with the vertical extraction axis and a device for the supply of liquid iron feeding the die, a machine in which at least one sealing gasket is located between the outlet from the supply device and the inlet to the die.
In order to ensure a satisfactory seal at the gasket or gaskets it is necessary to apply a certain tightening force to them parallel to the axis of extraction of the pipes. This force should act against the force extracting the pipes in order to compress the sealing gaskets and thus ensure a seal for the whole.
When a casting machine is brought up to steady state conditions, the various materials in contact with the liquid metal expand by different proportions according to the material. This expansion affects the tightening of the sealing gaskets, so the gaskets can be damaged and/or the seal for the liquid metal may be lost.
Difficulties of the same kind may result from creep of the gaskets over time, and also their adhesion to the pipe die during the course of manufacture.
SUMMARY OF THE INVENTION
The purpose of this invention is to overcome these various disadvantages by providing a casting machine in which a seal for the liquid metal is ensured during both the stage during which steady state conditions are attained and the stage of operation at constant high temperature.
In order to achieve this the invention relates to a sealing device for a casting table of a machine for the continuous vertical casting along a vertical extraction axis of parts, in particular pipes, of cast iron, the casting table comprising a die block which is aligned with the vertical extraction axis and also a device for supply of liquid iron feeding the die block, at least one sealing gasket being located between the outlet of the device supplying liquid iron and the die block, characterised in that it comprises means for tightening the die block against the device for the supply of liquid metal with a constant force, parallel to the vertical extraction axis, in order to tighten the sealing gaskets.
The sealing device for the casting table of the casting machine according to the invention may incorporate one or more of the following features:
the tightening means comprise a support for the die block which can be moved along an axis substantially parallel to the vertical extraction axis, a frame on which the device for the supply of cast iron is mounted, and at least two fluid-operated jacks regularly distributed around the die block, each jack being attached to both the said support and the said frame, and each jack being connected by means of a fluid conduit to a unit controlling the tightening force from each jack,
the fluid conduits for the jacks are joined together into a common fluid conduit, and this common conduit is connected to the unit governing the tightening force.
the fluid-operated jacks are hydraulic jacks,
the fluid-operated jacks are pneumatic jacks,
the bodies of the jacks are entirely located outside the space between the two horizontal planes bounding the induction coils.
The invention also relates to a casting table for a machine for the continuous vertical casting of parts, in particular pipes, of cast iron along a vertical extraction axis (X—X), the casting table comprising a die block aligned along the vertical extraction axis (X—X) and also a device for the supply of liquid iron feeding the die block, at least one sealing gasket being located between the outlet from the device for the supply of liquid iron and the die block, characterised in that it comprises a sealing device as defined above.
REFERENCES:
patent: 4506723 (1985-03-01), Bellocci et al.
patent: 4611651 (1986-09-01), Gourmel et al.
patent: 4690199 (1987-09-01), Gourmel et al.
patent: 1 357 949 (1964-07-01), None
patent: WO 94/26444 (1994-11-01), None
Arnould Fabien
Girardin Denis
Morcel Yvan
Batten, Jr. J. Reed
Pont-a-Mousson
Sughrue Mion Zinn Macpeak & Seas, PLLC
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