Metal founding – Including vibrator means – In continuous casting mold
Patent
1991-12-18
1993-02-23
Batten, Jr., J. Reed
Metal founding
Including vibrator means
In continuous casting mold
164428, B22D 1106
Patent
active
051881667
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a twin roll strip casting machine in which molten metals, especially steel, can be cast in the form of thin strip. In particular, this invention relates to apparatus for edge containment at the ends of the rolls of the twin roll casting machine.
In this specification, the expression "molten metal" includes liquid metal having a solid fraction.
A twin roll strip casting machine has molten metal fed into the area defined by the barrel lengths of the two working rolls and the containment members at the two ends of the rolls. The metal at the free surface in this area will freeze along each roll barrel, forming a shell. As the rolls rotate, each shell will grow as more metal freezes to it. The two shells are forced together as they pass through the nip between the two rolls.
It is possible that a shell may also be formed on the face of each edge containment member, especially if the edge containment member is nonwetting and its thermal conductivity is great enough to remove sufficient superheat and latent heat for solidification to commence. At the free surface, any shells formed against the edge containment members will be attached to the shells formed against the roll barrels. At any instant during casting, each edge containment shell will be widest at the free surface and tapered, according to the roll barrel profile, to a minimum width (product thickness) where the roll gap is least. Thus, during casting, the rolls must do most work on the edge containment shells to reduce their thickness and this can cause rippling of the edges of the strip thereby producing strip of poor quality.
It has been proposed to overcome this problem by arranging for the edge containment members to be partially or completely of refractory material thereby reducing the tendency for shells to form against them.
It is known from JP-A-87-259644 for edge containment members to be of refractory material and for them to be mounted on back-up plates. The containment member at one end of the rolls of a twin roll casting machine is oscillatable at up to ultrasonic frequency. The direction of oscillation is parallel to the longitudinal axes of the rolls. With this arrangement, therefore, the oscillating containment member moves towards and away from the ends of the roll barrels permitting molten metal to penetrate into the space between the roll barrels and the containment member.
In accordance with the present invention a twin roll strip casting machine has a pair of edge containment assemblies abutting against the ends of the roll barrels at opposite ends of the rolls, each of the assemblies comprising a face portion of refractory material supported by a backing plate and means for oscillating the assemblies, characterised in that means are provided to urge the assemblies towards the roll barrels such that the face portions of the assemblies are in contact with the ends of the roll barrels and the oscillating means oscillate both assemblies in directions parallel to the direction of casting with the face portions remaining in contact with the ends of the roll barrels.
In use, the refractory material will minimise shell growth on the face portions of the assemblies and solidified metal which is formed is shaken off by the oscillation to form centres for crystal growth.
By oscillating the assemblies in the direction of casting, it means that the face portions remain in contact with the ends of the roll barrels thereby preventing molten metal from penetrating between the ends of the roll barrels and the face portions.
By oscillating the assemblies parallel to the direction of casting, it means that any side spread occurring from rolling the two shells together will be forced into the same portion of the end assembly. This portion of the end assembly can be suitably shaped from a material to eliminate wear/erosion problems.
It is advantageous to be able to oscillate both the assemblies from a single source of ultrasonic oscillation. The source of oscillation may be hydraulic, electro- mechanical, pneumatic, electroma
REFERENCES:
patent: 4723590 (1988-02-01), Yamauchi et al.
Abstract of Japanese Patent Publication 57-130743 published Aug. 13, 1982.
Batten, Jr. J. Reed
Davy (Distington) Limited
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