Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Reexamination Certificate
1999-09-02
2001-09-18
Dunn, Tom (Department: 1725)
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
C164S485000
Reexamination Certificate
active
06289970
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mold wall of a continuous casting mold. The mold wall is composed of an inner mold plate and a water box connected to the inner mold plate through screw connections, wherein the slide of the inner mold plate facing the water box has webs with grooves extending between the webs, wherein the grooves have a groove width and filler pieces are arranged in the grooves.
2. Description of the Related Art
A mold wall of the above-described type is generally known in the art. The grooves serve as cooling ducts for a cooling liquid, which is usually water. The filler pieces serve to reduce the cross-section of the ducts, so that the flow velocity of the cooling liquid in the cooling duct is increased. However, the filler pieces do not have a supporting function. Fastening of the inner mold wall to the water box is effected through a plurality of screws which at least partially extend through the water box and are screwed into threaded pieces which are arranged in the inner mold plate.
The mold wall of the prior art described above has several disadvantages. In particular, mounting of the threaded pieces in the inner mold plate is very complicated. In addition, the inner mold plate usually is of copper, while the threaded pieces are of steel. Consequently, when a worn inner mold plate is exchanged, the copper has a large quantity of impurities and the inner mold plate is difficult to recycle.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a mold wall of a continuous casting mold which avoids the disadvantages of the prior art.
In accordance with the present invention
the grooves have undercuts with an undercut thickness,
the filler pieces have connecting elements with a connecting element thickness,
the filler pieces engage releasably in the undercuts, and
the screw connections are arranged between the filler pieces and the water box.
As a result of the configuration of the mold wall according to the present invention, the inner mold plate, which is a component which wears out, only has to have the webs for forming the cooling ducts. Further processing of the inner mold plate, particularly the assembly of screw connections in the inner mold plate, is not required. When the inner mold plate is disassembled, the inner mold plate of copper is automatically separated from the steel parts when the connecting elements are released. Consequently, the inner mold plate can be more easily recycled.
If the connecting element thickness is smaller than the undercut thickness, the connecting elements can be particularly easily inserted into the undercuts.
If the connecting elements and/or the undercuts are constructed conically, the connecting elements can be inserted without play into the undercuts.
If the connecting elements are constructed so as to be moveable out of the filler pieces, the filler pieces can be connected particularly simply to the grooves.
The releasable fastening of the filler pieces in the grooves can be effected, for example, by the features according to which
the connecting elements have swivel elements which can be swivelled about swivelling axes,
the swivel elements have a maximum length and a maximum width in swivel planes extending perpendicularly of the swivel axes,
the maximum length is greater than the groove width, and
the maximum width is at most equal to the groove width.
In this embodiment, the swivel elements may have, for example, a rectangular, elliptical or oval cross-section in the swivel plane.
As an alternative to the use of swivel elements, it is also possible that the connecting elements include expanding plates which can be moved by means of screws into the undercuts.
The expansion of the expanding plates may be effected, for example, by means of conically shaped spreading discs which are arranged between the screws and the expanding plates. Alternatively, or as an addition, the screws can be constructed at least in a portion thereof so as to taper conically.
If the connecting elements include spring elements, it is ensured that a positive engagement is maintained between the filler pieces and the webs even when the mold wall is heated.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the descriptive matter in which there are described preferred embodiments of the invention.
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Dunn Tom
Kerns Kevin P.
Kueffner Friedrich
SMS Schloemann--Siemag Aktiengesellschaft
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