Metal deforming – By use of roller or roller-like tool-element – With non-roller metal deforming station
Patent
1991-02-19
1992-09-15
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
With non-roller metal deforming station
72231, 72251, 72373, 72426, 164424, B21B 1500, B21B 3924, B21D 3106
Patent
active
051467810
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of, and apparatus for, reducing the width of a hot metal slab.
For the manufacture of metal strip, such as strip steel, it is becoming increasingly common to continuously cast a workpiece in the form of a slab, to cut the slab into lengths and to roll each length into strip. Because strips of different widths are required it is desirable that slabs of different widths should be available. If these slabs are to be cast in a continuous casting machine it is not convenient to have a number of moulds each representing a slab of different width. It is desirable, therefore, to cast slabs in a limited number of widths and, where necessary, to reduce the width of a slab to a predetermined value and to subsequently roll the slab into strip.
Japanese Patent Publication No. 59-199101 discloses apparatus for the aforesaid purposes.
According to the present invention, there is provided apparatus for reducing the width of a hot metal slab comprising:
means for presenting the slab to a pressing machine for applying forces to the edges of the slab and adapted to incrementally displace the slab forward after each application of the forces to reduce the width along its whole length,
a rolling mill, and means for presenting the slab to the rolling mill subsequent to the width reduction, characterised in that
the pressing machine is of vertically acting type and the slab is presented to the pressing machine with its width dimension vertical whereby the forces are applied to the top and bottom edges of the slab;
the means for presenting the slab to the pressing machine includes a press roller table,
the means for presenting the slab to the rolling mill comprises a mill roller table and
the press roller table and the mill roller table are arranged in parallel and a turning means is adapted to move the slab from the press roller table and deposit the slab on the mill roller table in a condition with its width dimension horizontal.
Further according to the present invention there is provided a method of reducing the width of a hot metal slab comprising the steps of:
moving the slab in the direction of its length, and presenting the slab to a pressing machine, applying forces to edges of the slab to reduce its width, incrementally displacing the slab in the direction of its length after each application of the forces to reduce the width of the slab along its whole length, and subsequent to the width reduction, rolling the slab in a rolling mill;
characterised by, presenting the slab to the pressing machine with its width dimension vertical, applying the forces to the top and bottom edges of the slab, turning the slab to a condition with its width dimension horizontal and displacing the slab in the direction perpendicular to its length, subsequent to the width reduction, to present the slab to the rolling mill by longitudinal displacement along a line parallel to the direction of displacement for presentation to the present machine.
By presenting the slab with its width dimension vertical to the pressing machine, a conventional vertically acting press can be employed to apply forces to the top and bottom edges of the slab in order to reduce the width dimension of the slab. Furthermore, it is possible for the pressing machine to have a fixed lower platen which engages with the lower edge of the slab and for a vertically reciprocating upper platen to engage with the upper edge of the slab. Such a pressing machine is simpler in construction than any pressing machine which would be required to act on the edges of the slab arranged with its width dimension horizontal.
Preferably the forces applied by the pressing machine area applied simultaneously over a substantial axial length, preferably at least equal to the original slab width. This enables the application of a pressing force sufficient to ensure that the stress field which causes deforming strains fully penetrates the width of the slab and avoids the formation of a dog bone cross-section in which the edges are thicker than the centre.
Normally t
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Bradshaw Timothy J.
Wilson Geoffrey
Davy McKee (Sheffield) Limited
Larson Lowell A.
Schoeffler Thomas C.
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