GB2024064A

GB2024064A - Continuous casting strand guide

Info

Publication number: GB2024064A
Application number: GB7920858A
Authority: GB
Original assignee: Voestalpine AG
Current assignee: Voestalpine AG
Priority date: 1978-06-23
Filing date: 1979-06-15
Publication date: 1980-01-09
Also published as: SE7904716L; AT359670B; IT1125359B; JPS555196A; CH641702A5; BR7903879A; ES481724A1; IT7923486A0; GB2024064B; ATA457778A; JPS6142666Y2; FR2429059A1; BE877083A; CA1131875A; DE2923617A1; JPS6011153U; SE441245B; FR2429059B1; DE2923617C2

Abstract

The strand guide includes two oppositely arranged guides formed of parallelly arranged rollers 3, and further two oppositely arranged guides also formed of parallelly arranged rollers 7 which are arranged at right angles to the rollers of the first two guideways, in which the further parallelly arranged guides include cantilever rollers (5). The further guide rollers 7 least with part of their circumference project into between the guideway rollers 3 arranged at right angles to them, and come close to the latter with little play (9) therebetween. <IMAGE>

Description

SPECIFICATION Improvements in or relating to a strand guide arrangement to be used in a continuous casting plant The invention relates to a strand guide for a continuous casting plant for supporting and guiding a cast strand of a rectangular or square cross section, wherein two guideways, formed of rollers arranged parallelly to one another lie opposite each other, and two further oppositely arranged guideways also formed of rollers arranged parallelly to one another are provided whose rollers are arranged at right angles to the rollers of the first two guideways, and two opposing guideways comprise cantilever rollers.

From German Offenlegungsschrift No.

1,458,1 32 it is known to provide foot rollers at continuous casting moulds, which support the strand at all four side faces. The rollers, at their ends, are held in cheeks which are fastened immediately at the mould. In the edge regions of the strand the latter is not supported by the rollers, since it is not possible with the rollers held in cheeks at the ends, to extend the roller as far as to the edge of the strand; the rollers are in each other's way.

It is furthermore known from U.S. patent No. 3,268,956 to support a strand slab at all sides, the rollers for supporting two slab sides bordering at each other, being mounted together in a single rigid supporting stand, which is movable in the direction of the two slab sides bordering at each other. The rollers provided for supporting the narrow sides of the slab are designed as overmounted roller bodies which, with one end, are directed to the rollers mounted at the opposite part of the stand and serving for supporting the broad sides of the slab, and with their other end directed to the rollers supporting the broad sides and mounted in the same stand, leave free a region in which the edge of the strand is not supported.In particular when using rollers of a diameter as small as possible-what results in the advantage of a short unsupported length between two neighbouring rollers-the unsupported region at the edge of the cast slab, with the known roller arrangement, becomes greater, since the rollers together fastened in one supporting stand cannot be moved closer to each other, due to the fastening and bearing arrangements.

With modern continuous casting plants, the diameters of the rollers are downwardly determined by the necessary outer diameters of the bearings, so that the roller surface projects only slightly beyond bearings, for which reason moving closer of the rollers supporting the strand at neighbouring areas in one and the same stand is not possible.

The support of the edge region of a cast strand is all the more important with rapid continuous casting plants, since the strand in those regions, in particular if its skin has still a very small thickness-as this is the case immediately after the extraction of the strand from the mould-is subjected to high strains.

The invention aims at avoiding the disadvantages and difficulties described and has as its object to provide a strand guide of the initially defined kind with which the edge regions of the strand can be supported without any problem, strand guiding rollers of small diameters as possible being utilizable.

This object is achieved according to the invention in that, for supporting the edge regions of the cast strand, the cantilever rollers of two oppositely arranged guideways comprise roller bodies overmountedly arranged at both ends, which, at least with part of their circumference, project into between the guideway rollers which are arranged at right angles to them and come next to the latter with little play between them.

Suitably, the cantilever rollers are arranged immediately below the mould, where they function as foot rollers supporting the strand still comprising a very sensible strand skin, at its edge regions against bulging. The rollers advantageously are mounted in supporting strands fastened to the mould side walls.

According to a preferred embodiment, the cantilever rollers are mounted in supporting stands which are movable independently of the holding devices of the rollers arranged at right angles to the cantilever rollers, whereby the strand guide can be adapted to various strand dimensions in a particularly simple manner.

The invention will now be described in more detail by way of two embodiments schematically illustrated in the accompanying drawings, wherein: Figures 1 and 2 represent a view, the viewing direction extending parallel to the longitudinal axis of the strand guide, onto the strand guide fastened at the mould, according to the section l-l of Fig. 3; and Figure 3 illustrates a section along line Ill-Ill of Fig. 1, the strand guiding rollers having been displaced according to a strand format-illustrated by dot-and-dash lines in Fig.

1.

Supporting rollers provided at a continuous casting plant for slabs for supporting the braod sides of the slab and which, over their length, are supported at four spots against a strand guiding stand not illustrated, are denoted by 1. Roller bodies 3 forming the roller 1 are rotatably threaded on an axle 2, holding devices 4 each being provided between two neighbouring roller bodies 3 as well as at the ends of the roller 1.

For supporting the narrow sides of the slabs, cantilever rollers 5 are provided, which are formed of two roller bodies 7 that are rotatably threaded on an axle 6. The axle 6 is supported at a stand part 8 between the two overmountedly arranged roller bodies 7, which stand part is displaceable independently of the stand part carrying the rollers supporting the broad side of the slabs. The length of the roller bodies 7 is dimensioned such that the cantilever roller 5 formed of the roller bodies 7 is smaller than the narrow side 10 of the slab only by a slight play 9 present at both ends of the cantilever roller 5. The play 9 is dimensioned just as big that the cantilever rollers 5 can turn without contacting the rollers 1 arranged at a right angle to them.

The cantilever rollers 5, with part of their circumference, project into between the rollers i arranged at a right angle to them. Thereby it is reached that the edge regions 11 of the slab are supported almost entirely, i.e. only with the exception of a region resulting from the size of the play 9. It can be seen from Fig.

3 that the supporting stand 8 is fastened at the narrow-side wall 1 2 of the mould 13, whereby it is possible to displace the cantilever rollers 5 simultaneously with the displacement of the narrow-side wall 12, which is effected by means of adjustment spindles 1 5 drivable by gears 14, the edge support of the slab always remaining the same.

Instead of the multiply supported rollers 1, it is also possible to provide rollers 1 6 that are supported only at the ends, as is illustrated in Fig. 2. It is also possible to arrange the roller bodies 3 and 7 of the rollers 1 and 5 rigidly on the axle, and to mount the axle itself rotatably in the supporting stand, in which case bearings are inserted in the holding devices 4 and the stand parts 8.

Claims

1. In a strand guide arrangement to be used in a continuous casting plant for supporting and guiding a cast strand of rectangular or square cross section emerging from a mould, of the type including two first oppositely arranged guideways formed of first parallelly arranged rollers, two second oppositely arranged guideways formed of second parallelly arranged rollers, said second parallelly arranged rollers being arranged at right angles to said first parallelly arranged rollers, and said two second oppositely arranged guideways including cantilever rollers, the improvement which is characterized in that the cantilever rollers comprise roller bodies overmountedly arranged at the two ends thereof for supporting said cast strand at its edge regions, said roller bodies, at least with part of their circumference, projecting in between said first parallelly arranged rollers of said two first oppositely arranged guideways and coming close to said first parallelly arranged rollers with little play provided therebetween.

2. A strand guide arrangement as set forth in claim 1, wherein said cantilever rollers are arranged immediately below the mould.

3. A strand guide arrangement as set forth in claim 2, further comprising supporting stands fastened to the mould side walls, said cantilever rollers being mounted in said supporting stands.

4. A strand guide arrangement as set forth in claim 1, 2 or 3, further comprising holding means for said first parallelly arranged rollers at right angles to said cantilever rollers, and supporting stands for said cantilever rollers, which supporting stands are movable independently of the holding means for said first parallelly arranged rollers.

5. A strand guide arrangement substantially as hereinbefore described with reference to the accompanying drawings.