GB2219992A

GB2219992A - Separation of strip widths in longitudinally slit strip

Info

Publication number: GB2219992A
Application number: GB8911884A
Authority: GB
Inventors: Oskar Noe; Rolf Noe; Andreas Noe; Hermann Koppers
Original assignee: BWG Bergwerk und Walzwerk Maschinenbau GmbH
Current assignee: BWG Bergwerk und Walzwerk Maschinenbau GmbH
Priority date: 1988-06-22
Filing date: 1989-05-24
Publication date: 1989-12-28
Anticipated expiration: 2009-05-24
Also published as: FR2633266A1; FR2633266B1; GB2219992B; GB8911884D0; DE3820997C2; DE3820997A1

Description

2-2.19992 SEPARATION OF STRIP WIDTHS IN LONGITUDINALLY SLIT STRIP This

invention relates to a device for the separation of strip widths in a longitudinally slit strip#, more particularly a metal stript but it is within the scope of the invention to separate the widths in longitudinally slit strips of paper, synthetic plastics,, textiles or the like. The metal strips in question are primarily aluminium strips.

The longitudinal slitting of strips is undertaken for example in steel and aluminium strip mills, so as to optimise the mill performance by making wide strips. wide strips are regularly separated into two or three strip widths by longitudinal slitting. When strips are separated into widths by a longitudinal midline slit for example, the individual strip widths are liable to overlap as they are coiled on to a single coiling mandrel. The overlapping turns become firmly held together and the strip widths cannot be removed individually from the coiling mandrel. Moreover, thin metal strips often undergo serious damage at the slit edges. attempts have been made to avoid the overlapping of strip widths by coiling them on separate coiling mandrels disposed one behind or over another. This requires costly equipment and does not exclude edge damage.

It is also known to replace a simple separating slit by a double slit with an intermediate waste widthr which is diverted to a scrap coiler or scrap shears. The width of the waste strip - usually about 10 to 20 mm corresponds to the extent of the overlap of overlapping turns. The disadvantage of this procedure is the high scrap rate arising from the 2 intermediate waste widths. The latter actually increase the scrap rate by around 1%. At an annual throughput of say 150,000 tons this amounts to 1500 tons of annual scrap.

The object of the invention is to provide a dev ice whereby the scrapfree separation of the strip widths in a longitudinally slit strip, more particularly a metal stript can be ensured by simple and functionally apt means#, so as to produce sepa rated coils at the coiling stage.

According to the present invention#, a device for the separation of strip widths in a longitudinally slit strip comprises at least two looping rolls with their axes parallel to each other and at right angles to the direction of strip advance, and an oblique roll between the looping rolls for deflecting a strip width, the oblique roll being adjustable about a vertical axis to bring its axis into an oblique plane at a specified angle and disposed in a horizontal plane parallel to and below or above the plane common to the axes of the two looping rolls. Thus, the invention provides for the strip widths formed by cutting in a longitudinal slitting shear to be passed round a set of rolls at least one of which - namely the oblique roll - is adjusted so as to deflect one strip width in a horizontal plane. The one strip width is displaced relative to the other#, which continues to advance on a straight line as viewed in vertical projection. The extent of the displacement can be regulated over a wide range by setting the oblique roll appropriately.

Preferred or additional features of the invention will now be described. Thus, according to one proposal of 3 independent significance, the oblique roll is mounted with freedom for longitudinal adjustment in the axial direction of the looping rolls. This permits the parallel displacement of strip widths of different breadths. The distance between the two looping rolls preferbly corresponds to the diameter of the oblique rollf and the midline of the deflected strip width formsa tangentat therun-off point onthefirst looping roll and the run-on point on the oblique roll, and again at the run-on point on the second looping roll and the run-off point on the oblique roll. This ensures, by simple and functionally apt means, that the deflected strip width will not wander uncontrollably on the oblique roll or the looping r oll s. The barrel lengths of the looping rolls are preferably adapted to the maximum strip breadth made in the mill,, while the barrel length of the oblique roll corresponds approximately to half those of the looping rolls. When a strip is slit longitudinally into two strip widths, one of the strip widths can retain its initial line of advance. A single oblique roll then suffices to deflect the other strip w idth. When a strip is slit longitudinally into three strip widths,, the middle strip width retains its initial line of advance and the outer two are displaced over one oblique roll each. In this connection, the invention provides that two oblique rolls are disposed side by side, they are mounted independently of each other with freedom for adjustment along the axial direction of the looping rolls and each oblique roll can be skewed to angles between about 2 to 5 degrees relative to the looping roll axes.

The 1 oopi ng r ol 1 on th e r un-of f si de i s pr ef er ably followed by at least one further looping roll, and a length equalising roll is provided between and above or below the last two looping rolls, to take the strip width which is not deflected but remains on its original coursei the looping rolls on the one hand, together with the oblique roll and the length equalising roll on the other hand, being disposed pair by pair in common horizontal planes. It is possible in principle to crop the ends of the two strip widths at the coiler, to make them equal in length. However, this is unnecessary when the length equalising roll is interposed.

Moreoverp the looping rolls are then advantageously disposed at the same level (the pass-line), even when only two looping rolls and an interposed oblique roll are provided.

Each oblique roll is preferably mounted in a housing frame having a vertical pivot to form the vertical adjustment axist and the housing is abutted through the pivot against a slide, which is guided and driven on transoms axially parallel to the looping roll axes. In this way, the oblique rolls can easily be adjusted to the positions appropriate to the strip widths in production. In this connection, a strip edge regulator having a control circuit to actuate an adjusting system for the slide carrying the relevant oblique roll is preferably provided ahead of the relevant coiler, at least for each def lected strip width. In every casep the longitudinally separated strip widths are satisfactorily coiled into separate ring coils, without having to accept the formation of scrap intermediate widths. In the typical case of aluminium strips selling at about 1800 to 2400 DM/ton, a saving of 2.7 to 3.6 million DM per annum is made if the scrap referred to above amounts to 1500 tons per annum.

A number of embodiments of the invention will now be described, purely by way of example, with reference to the accompanying drawings, in which:Figure 1 is a plan view of a separating device in accordance with the invention, for two strip widths; Figure 2 is a side elevation of the device of Figure 1; Figure 3 is another embodiment similar to the device of Figure 1 but having a following length equalising roll; Figure 4 is a side elevation of the device of Figure 3; and Figure 5 is a plan view of a further embodiment in accordance with the invention for the production of three strip widths.

Figures 1 and 2 depict a device for the separation of strip widths la, lb in a longitudinally slit strip 1, more particularly a metal strip. This device is characterised in that two looping rolls 3ai 3b are provided, their axes 2a, 2b being parallel to each other and at right angles to the direction of strip advancer and an oblique roll 5 between the looping rolls for deflecting the strip width la, the oblique roll being adjustable about a vertical axis 4 to bring its axis into an oblique vertical plane at a specified angle 0(\ and disposed in a horizontal plane parallel to and below (but it could equally be above) the plane common to the axes 2a, 2b 6 of the two looping rolls 3a,, 3b. The oblique roll 5 is also mounted with freedom for longitudinal adjustment in the axial direction of the looping rolls 3a, 3b. Thust adjustment to the breadth of the deflected strip width la is effected by longitudinal displacement. Longitudinal slitting shears 6 are indicatedahead of the looping roll 3a on the run-in side, and a coiler 7 with its build up of turns 8 is indicated beyond the looping roll 3b on the run-out side. The distance between the two looping rolls 3a, 3b corresponds to the diameter D of the oblique roll 5. The midline M of the deflected strip width f orms a tangent T at the run-off point on the first looping roll 3a and the run- on point on the oblique roll 5, and again at the run-on point on the second looping roll 3b and the run-off point on the oblique roll 5.

The barrel length Ln of each looping roll 3a, 3b is adapted to the maximum strip breadth made in the mill. The barrel length Ls Of the oblique roll 5 accordingly corresponds to about half that of the looping rolls 3a, 3b.

In the embodiment of Figure 5r for three strip widths la#, lb,, lcr two oblique rolls 5 are disposed side by side, with freedom for individual adjustments in the axial direction of the looping rolls 3a, 3b. Each oblique roll 5 - and this applies equally to the embodiments of Figures 1 and 2 having only one oblique roll 5 for two strip widths lay lb - can be skewed to an angleC( between about 2 to 5 degrees relative to the axes 2a, 2b of the looping rolls 3a, 3b. In principle, smaller and larger angles can be selected.

In the embodiment of Figures 3 and 4, length equalisation is achieved by providing at least one f urther looping roll 9 beyond the looping roll 3b on the run-off side, together with a length equalising roll 10 disposed below (but it could equally be above) the last two looping rolls 3b, 9j, to take the strip width lb which is not defelcted but remains on its origial course. The looping rolls 3ar 3bt 9 on the one hand, together with the oblique rolls 5 and the length equalising roll 10 on the other hand, are disposed pair by pair in common horizontal planes.

The embodiment of Figure 5 could likewise be provided with length equalisation for the undeflected strip width lb.

Each oblique roll 5 is mounted in a housing frame 11 (Figures 1 and 2) having a vertrical pivot 12 to form the vertical adjustment axis 4. The housing 11 is abutted through the pivot 12 against a slide 13, which is guided and driven on transoms 14 axially parallel to the axes 2at 2b of the looping rolls 3at 3b. A strip edge regulator can be provided for at least the or each deflected strip width la, lct ahead of the relevant coiler 7, having a control circuit to actuate an adjustment system for the slide 13 carrying the relevant oblique roll 5r though this feature is not shown.

According to a further proposal of the invention of independent significances, the devices as described above can also be used to interleave or bring together the strip widths lat and 1b or la, lb and lc of a longitudinally slit strip It by angling the or each oblique roll 5 oppositely. Strip widths must be brought together for example when they are to be welded together to form strips of greater breadth. The respective device is then used to feed a suitable welding N machine.

01 -m 1

Claims

1 CLAIMS

1. A device for the separation of strip widths in a longitudinally slit strip comprising at least two looping rolls with their axes parallel to each other and at right angles to the direction of strip advance, and an oblique roll between the looping rolls for deflecting a strip width, the oblique roll being adjustable about a vertical axis to bring its axis into an oblique vertical plane at a specified angle and disposed in a horizontal plane parallel to and below or above the plane common to the axes of the two looping rolls.

2. A device as in Claim 1, wherein the oblique roll is also mounted with freedom for longitudinal adjustment in the axial direction of the looping rolls.

3. A device as in Claim 1 or Claim 2, wherein the distance betwen the two looping rolls corresponds to the diameter of the oblique roll, and the midline of the deflected strip width forms a tangent at the run-off point on the first looping roll and the run-on point on the oblique roll# and again at the run-on point on the second looping roll and the run-off point on the oblique roll.

4. A device as in any one of Claims 1 to 3p wherein the barrel length of the looping rolls is adapted to the maximum strip breadth, while the barrel length of the oblique roll corresponds approximately to half that of the looping rolls.

5. A device as in any one of Claims 1 to 4, wherein two oblique rolls are disposed side by side, they are mounted independently of each other with freedom for adjustment along the axial direction of the looping rolls, and each oblique roll can be skewed to angles between about 2 to 5 degrees relative to the looping roll axes.

6. A device as in any one of Claims 1 to 5j, wherein the looping roll on the run-of f side is followed by at least one further looping roll. and that a length equalising roll is provided above or below the last two looping rollst to take the strip width which remains undeflected, the looping rolls on the one hands. together with the oblique roll and the length equalising roll on the other hand, being disposed pair by pair in common horizontal planes.

7. A device as in any one of Claims 1 to 6j, wherein the or each oblique roll is- mounted in a housing frame having a vertical pivot to form the vertical adjustment axis,, and the housing is abutted through the pivot against a slide, which is guided nd driven on transoms axially parallel to the axes of the looping rolls.

8. A device as in any one of Claims 1 to 7, wherein a strip edge regulator having a control circuit to actuate an adjustment system for the slide carrying the relevant oblique roll is provided ahead of a corresponding coiler at least for the or each deflected strip width.

9. A device for the separation of strip widths in a longitudinally slit strip substantially as hereinbefore described with reference to Figures 1 and 2p Figures 3 and 40, or Figure 5 of the accompanying drawings.

Published 1989 atThePatent Mce,S House.66f71 HighHolborzLUndonWC1R4TP. PUrtherC3pies maybe obtafmm The Patent otftce.

Sales Branch, St Mary Cray, Orpington, Xent BR6 SED. Pri by Multiplex technique 3 ltd, St Kent, Con. 1187