GB2181681A - Universal stand - Google Patents

Abstract

A stand for a universal-flat rolling mill, comprises a pair of power driven horizontal rolls 4 for working the flat faces of the stock between them and a pair of idler vertical rolls 10 on each side of the stock 6 for working the edges, each pair of vertical rolls being mounted on the ends of a separate yoke 8 pivotally mounted on opposite sides of the stock in a plane containing the axes of the horizontal rolls. This design is eminently suitable as a 'conversion' of an existing mill stand, and changes in rolling schedules between universals and flats may readily be effected. <IMAGE>

Description

SPECIFICATION Improvements in rolling universal flats This invention relates to rolling mills, and more part icularlyrelatestomillsforrolling universal flats in, e.g. steel.

Hitherto, conventionally both the co-operating pairs of horizontal rolls and the pairs of vertical rolls in a universal-flat mill are power driven and the horizontal and vertical sets are spaced from one another in the direction of movement of the stock. Awidevariety of roll sizes are employed for rolling flats of different dimensions and care must be taken to restrain the tendencyforthe flat to twist between thevertical and horizontal working rolls; additionally, the greaterthe distance between these sets of rolls (to accommodate a wider dimensional range) the less defined is the squareness of the corners.

It is an object of this invention to provide a more versatile universal-flat rolling mill.

In accordance with this invention there is provided a stand for a universal-flat rolling mill, comprising a pair of power driven horizontal rolls for working the flat facets ofthe stock between them and a pairofidler vertical rolls on each side ofthe stockforworking the edges, each pair of vertical rolls being mounted on the ends of a separate yoke pivotally mounted on opposite sides of the stock in a plane containing the axes of the horizontal rolls.

Both the horizontal and the vertical sets of rolls are adjustable to embrace a wide range of dimensions to which the flats may be rolled and the vertical rolls may be 'chamfered' at their corners to enable them to be closed-up to a greater degree - without fou ling the co-operating horizontal rolls - than would otherwise be the case.

Both the main stand and the finishing stand in the mill train may be designed in accordancewiththis invention, the finishing stand being adjusted for a very light 'finishing' pass.

In orderthatthis invention may be fully understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which: Figure lisa schematic side elevation of a stand according to this invention; and Figure2 is a section on A-A.

Referring now to the drawings, two power driven horizontal rolls 3 have shafts 4 mounted in a mill stand housing 5 in the conventional manner and operated to roll flat stock 6 to the appropriate thickness.

A pair of roll chocks 7 supportwithin them a yoke or bell crank 8 via a central shaft 9 and mounted at each end oftheyoke are freely rotatable (idler) edging rolls 10. Theyokes are adjustable (by means notshown) abouttheirshafts 9 and locked in position to allow the distance between the rolls 10 across the width of theflaton either side ofthe rolls 3 to be pre-setto give the desired draughting conditions.

The yoke 8 and the edging rolls 10 are designed such that the rolls 10 work the edges of the stock 6 as close as possibleto the plane containingthe axesof the horizontal rolls 3 - indeed the rolls 10 may be chamfered as shown in orderto close up as much as possible to the 'nip' of the rolls 3.

In accordance with this invention therefore the normal adjustment, or replacement, of the horizontal rolls and the adjustment ofthe vertical rolls via the chocks 7 in the direction ofthe arrows enable a wide range oftwist-freeflat product sizes to be rolled, e.g.

a range offlatsfrom 150mmx 100mm to 650 mmx 10 mm may typically be accommodated with 3 sets of horizontal rolls and one set of vertical rolls.

The vertical rolls 10 are not powered, thus reducing installation and operating costs, and the design is such that the yoke 9 in which these rolls are mounted may simply befitted to a normal Universal Mill vertical roll chock 7 utilising the normal centre shaft of these vertical rolls. This design is thus eminently suitable as a 'conversion' of an existing mill stand, and changes in rolling schedules between universals and flats may readily be effected. Since the vertical rolls are idlers there is no speed matching required between the horizontal and vertical rolls and the lifetime of the latter is extended because there is no ten dencyforthem to 'skid' overthe surface on mismatched speeds between one set on one side andthe opposite set on the other.

This invention thus affords low cost rolling with a wide degree offlexibility whilst improving the product quality.

1. Astandfora universal-flatrolling mill,comprising a pair of power driven horizontal rollsfor working the flat faces of the stock between them and a pair of idler vertical rolls on each side of the stock for working the edges, each pair of vertical rolls being mounted on the ends of a separate yoke pivotally mounted on opposite sides of the stock in a plane containing the axes ofthe horizontal rolls.

2. Astand according to claim 1,whereinthe horizontal and vertical rolls are each adjustable to vary the spacing between them whereby to work a wide dimensional range of stock.

3. A stand according to claim 1 orclaim2, wherein the edges of the vertical rolls are chamfered.

4. A stand according to any one of claims 1 to 3, wherein each yoke is lockable to permit the distance between the oppositely disposed vertical rolls to be pre-setto give the desired draughting conditions.

5. Astandfora universal-flat rolling mill, sub stantially as herein described with reference to the accompanying drawing.

6. A mill train in which with the main stand and the finishing stand are in accord with any one of claims 1 to 5.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in rolling universal flats This invention relates to rolling mills, and more part icularlyrelatestomillsforrolling universal flats in, e.g. steel. Hitherto, conventionally both the co-operating pairs of horizontal rolls and the pairs of vertical rolls in a universal-flat mill are power driven and the horizontal and vertical sets are spaced from one another in the direction of movement of the stock. Awidevariety of roll sizes are employed for rolling flats of different dimensions and care must be taken to restrain the tendencyforthe flat to twist between thevertical and horizontal working rolls; additionally, the greaterthe distance between these sets of rolls (to accommodate a wider dimensional range) the less defined is the squareness of the corners. It is an object of this invention to provide a more versatile universal-flat rolling mill. In accordance with this invention there is provided a stand for a universal-flat rolling mill, comprising a pair of power driven horizontal rolls for working the flat facets ofthe stock between them and a pairofidler vertical rolls on each side ofthe stockforworking the edges, each pair of vertical rolls being mounted on the ends of a separate yoke pivotally mounted on opposite sides of the stock in a plane containing the axes of the horizontal rolls. Both the horizontal and the vertical sets of rolls are adjustable to embrace a wide range of dimensions to which the flats may be rolled and the vertical rolls may be 'chamfered' at their corners to enable them to be closed-up to a greater degree - without fou ling the co-operating horizontal rolls - than would otherwise be the case. Both the main stand and the finishing stand in the mill train may be designed in accordancewiththis invention, the finishing stand being adjusted for a very light 'finishing' pass. In orderthatthis invention may be fully understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which: Figure lisa schematic side elevation of a stand according to this invention; and Figure2 is a section on A-A. Referring now to the drawings, two power driven horizontal rolls 3 have shafts 4 mounted in a mill stand housing 5 in the conventional manner and operated to roll flat stock 6 to the appropriate thickness. A pair of roll chocks 7 supportwithin them a yoke or bell crank 8 via a central shaft 9 and mounted at each end oftheyoke are freely rotatable (idler) edging rolls 10. Theyokes are adjustable (by means notshown) abouttheirshafts 9 and locked in position to allow the distance between the rolls 10 across the width of theflaton either side ofthe rolls 3 to be pre-setto give the desired draughting conditions. The yoke 8 and the edging rolls 10 are designed such that the rolls 10 work the edges of the stock 6 as close as possibleto the plane containingthe axesof the horizontal rolls 3 - indeed the rolls 10 may be chamfered as shown in orderto close up as much as possible to the 'nip' of the rolls 3. In accordance with this invention therefore the normal adjustment, or replacement, of the horizontal rolls and the adjustment ofthe vertical rolls via the chocks 7 in the direction ofthe arrows enable a wide range oftwist-freeflat product sizes to be rolled, e.g. a range offlatsfrom 150mmx 100mm to 650 mmx 10 mm may typically be accommodated with 3 sets of horizontal rolls and one set of vertical rolls. The vertical rolls 10 are not powered, thus reducing installation and operating costs, and the design is such that the yoke 9 in which these rolls are mounted may simply befitted to a normal Universal Mill vertical roll chock 7 utilising the normal centre shaft of these vertical rolls. This design is thus eminently suitable as a 'conversion' of an existing mill stand, and changes in rolling schedules between universals and flats may readily be effected. Since the vertical rolls are idlers there is no speed matching required between the horizontal and vertical rolls and the lifetime of the latter is extended because there is no ten dencyforthem to 'skid' overthe surface on mismatched speeds between one set on one side andthe opposite set on the other. This invention thus affords low cost rolling with a wide degree offlexibility whilst improving the product quality. CLAIMS

1. Astandfora universal-flatrolling mill,comprising a pair of power driven horizontal rollsfor working the flat faces of the stock between them and a pair of idler vertical rolls on each side of the stock for working the edges, each pair of vertical rolls being mounted on the ends of a separate yoke pivotally mounted on opposite sides of the stock in a plane containing the axes ofthe horizontal rolls.

2. Astand according to claim 1,whereinthe horizontal and vertical rolls are each adjustable to vary the spacing between them whereby to work a wide dimensional range of stock.

3. A stand according to claim 1 orclaim2, wherein the edges of the vertical rolls are chamfered.

4. A stand according to any one of claims 1 to 3, wherein each yoke is lockable to permit the distance between the oppositely disposed vertical rolls to be pre-setto give the desired draughting conditions.

5. Astandfora universal-flat rolling mill, sub stantially as herein described with reference to the accompanying drawing.

6. A mill train in which with the main stand and the finishing stand are in accord with any one of claims 1 to 5.