EP0808673A1 - Rolling stand with back-up rolls and work rolls - Google Patents

Abstract

The invention relates to a roll stand with support and work rolls for rolling sheets and strips, in which at least the upper and lower work rolls, which are mounted in chocks within the stand windows formed between the stator columns of the roll stands, by horizontal displacement in opposite directions by means of displacement drives which are effectively assigned to the chocks common vertical plane can be shifted into positions in which the vertical planes passing through the roll axis of the upper work roll and the lower work roll intersect. This is achieved in that on the opposite inner and outer sides of each stand column (5,6), which run parallel to the rolling direction, a displacement and swivel bearing is arranged for one of two mutually parallel, essentially horizontal beams (9), in each case support the relevant work roll chock of the upper (3a) and lower work roll (3b) on both sides in the vertical and horizontal direction, and the other projecting ends of these pairs of beams with the displacements (21) - And correspond with the bending cylinder (19). <IMAGE>

Description

The invention relates to a roll stand with support and work rolls for rolling sheets and strips, in which at least the upper and lower work rolls, which are mounted in chocks within the stand windows formed between the stator columns of the roll stands, by horizontal displacement in opposite directions by means of displacement drives which are effectively assigned to the chocks common vertical plane can be shifted into positions in which the vertical planes passing through the roll axis of the upper work roll and the lower work roll intersect.

Systems are known in which the upper and lower rolls of a four-high mill stand are pivoted in opposite directions. The profile of the rolling stock can be adjusted by interlacing the rollers and crossing the roller axes, possibly in conjunction with work roll bending forces. A resultant advantage is a larger adjustment range when setting the rolling stock profile.

A wide variety of solutions have been proposed for adjusting the pairs of rollers. The european. Patent application 0 525 552 A1 proposes common sliding blocks for the chocks of the work and back-up rolls, which are arranged between the chocks and the roll stand and have wedge surfaces on their sides facing away from the chocks, which correspond with vertically adjustable displacement drives with such wedge surfaces. When adjusting these sliding drives, the wedge surfaces sliding on one another cause a horizontal displacement of the sliding blocks, as a result of which they adjust the chocks lying on the side.

Other adjustment drives have also become known from the same document, such as hydraulic cylinders or spindles acting mechanically on the chocks, with which the chocks are changed horizontally within the stand window in order to change the roller positions.

The known systems are very complex, in particular when, in addition to the displacement of the rolls, devices for bending them are provided which usually require special work roll bearings. The roller sets must be provided with axial locks in order to be able to absorb the axial forces caused by the system-related inclination of the rollers. Retrofitting existing roll stands with systems for crossing and bending the work rolls is not possible or only possible at an unacceptably high cost.

Starting from a prior art, as is known, for example, from EP 0 525 552 A1, the object of the present invention is to provide a device for crossing and bending the work rolls on a roll stand with support and work rolls for rolling sheets and strips to be provided, which can be easily retrofitted to existing rolling mills while avoiding complex mechanics.

To solve the problem it is proposed according to the invention in connection with the features in the preamble of claim 1 that on the opposite, parallel to the rolling direction inner and outer sides of each stator column each have a sliding and pivot bearing for one of two mutually parallel, coupled, im essential horizontal bars is arranged, which on both sides protrude beyond the stand columns into the stand window on the one hand and protrude from the roller stand on the side facing away from the stand window, the ends of two pairs of bars protruding into the stand window of one stand side, the respective work roll chock of the upper and lower work roll Support synchronously adjustable on both sides in the vertical and horizontal directions and the other projecting ends of these pairs of beams correspond to the displacement and bending cylinders, which, between the roll stand and de n arranged beams, the latter move in opposite directions in the shifting position and / or swivel about the swivel axes of the swivel bearings.

The invention proposes a very simple system with sliding and pivoting beams guided on the outside of the stand, which acts on the chocks in the sense of a horizontal and vertical movement. The bending forces are generated on the outside of the scaffolding and are guided into the stand via the pivot bearings of the beams. In the area of the pivot bearings, the sliding bearings for the beams are provided at the same time, so that overall a mechanically very simple system results, the particular advantage of which is that the entire device can also be retrofitted to existing roll stands.

Each displacement and swivel bearing preferably consists of axially parallel and axially parallel to the upright columns with respect to a upright column, about their horizontal central axes guide bushes, each of which is transversely centrally penetrated in the transverse direction by a recess leading the beam on both sides in the longitudinal direction and with its cylindrical outer lateral surfaces on both sides the longitudinal axes of the beams are slidably guided in bearing shells, which in turn are provided in bearing blocks arranged on the support columns.

The guide bushes that represent the swivel bearing are of very strong dimensions and at the same time also accommodate the bearings for the reciprocating movement of the beams in the horizontal direction. The bearing blocks provided to support the guide bushes on the upright columns can be retrofitted there.

For bending the work rolls, bending cylinders are provided according to a further feature of the invention, which are slidably arranged on a bracket on the stator column on the one hand and on the other hand on the beams, the bending forces being guided into the stator columns via the guide bushes and the bearing shells. These bending cylinders act in the vertical direction on the end of each beam protruding outward from the area of the stator columns, regardless of its displacement position. The bar forms a two-armed lever. In order to ensure the displacement of the beams, the ends of the bending cylinders facing the beams are slidably supported on the beams.

A pair of beams is preferably coupled to a stand column via crossbeams which extend transversely to the beams on both sides of the stand columns. This creates a stable, closed system that is also able to transmit large forces.

A favorable embodiment of the invention is characterized in that the guide bushes on each side of each swivel and displacement bearing are arranged on a common axis, which passes through the column of columns and an elongated hole penetrating the beam in the direction of displacement of the beam and which is designed as a pressure-actuated pull rod, the beams of the pair of beams clamped against each other and jammed. The axis connecting the two guide bushes is inserted through a hole in each stand column of the roll stand, which also serves to clamp the beams in the guide bushes. For this purpose, on the one hand, a pressure medium cylinder is attached to the end of the axis designed as a pull rod, with which the clamping force can be applied in the axial direction against an abutment provided at the other end of the pull rod. The clamping can be supported by spring packs.

In an alternative embodiment of the invention, in order to achieve the object in connection with the features in the preamble of claim 6, it is proposed that the stand columns of the roll stand are broken in the rolling direction for the displacement of the work rolls in the horizontal direction and guides for horizontally projecting slidable beams in the stand window form, of which two coaxially opposite beams are assigned to a chock which can be moved horizontally in the stand window by synchronized displacement of these beams, and that for bending the work rolls in the vertical direction, each beam receives at least one vertically acting bending cylinder at its end projecting into the stand window , which grips behind a projection on the chock.

In this proposal, the bars for moving the chocks are inserted through bores running in the rolling direction in the upright columns and guided therein. To lift the chocks for the purpose of bending the work rolls, the bending cylinders are arranged in the ends of the beams projecting into the stator window and engage behind projections of the chock to make it vertical Direction to adjust. The proposed solution is characterized by the simplicity of its construction. It can be retrofitted into old roll stands. A prerequisite for this is an appropriate stand strength, which is usually given, however, especially with older rolling stands. According to a further feature of the invention, the beams guided in the upright columns are displaced by horizontally acting displacement cylinders which are connected to the ends of the beams facing away from the upright window and are indirectly supported on the outside of the upright columns.

The "beam solution" creates a very inexpensive and simple mechanical solution that can be easily used to retrofit old rolling stands. The device works reliably and precisely and enables the work rolls to be bent and moved in the necessary setting range. The equipment is part of the roll stand and is only required once for all work rolls. This reduces the invested capital in particular compared to solutions in which the devices for bending and crossing the work rolls are directly assigned to the work rolls or their chocks.

Figur 1

ein Walzgerüst mit Stütz- und Arbeitswalzen zum Walzen von Blechen mit der erfindungsgemäßen Einrichtung;

Figur 2

einen vergrößerten Schnitt durch die Verschiebe- und Schwenklager nach der Erfindung;

Figur 3

einen um 90° gedrehten Schnitt durch die erfindungsgemäße Einrichtung und deren Biegezylinder;

Figur 4

die Klemmung der Balken über die Zugstangen und

Figur 5

eine alternative Einrichtung zum Biegen und Kreuzen der Arbeitswalzen.

Exemplary embodiments of the two proposals according to the invention are shown in the drawing and are described below. It shows:

Figure 1

a roll stand with support and work rolls for rolling sheets with the device according to the invention;

Figure 2

an enlarged section through the sliding and pivot bearing according to the invention;

Figure 3

a section rotated by 90 ° through the device according to the invention and its bending cylinder;

Figure 4

the clamping of the beams over the tie rods and

Figure 5

an alternative device for bending and crossing the work rolls.

In FIG. 1, the roller stand of a four-high mill stand is designated by 1, the upper support roller is designated by 2a and the lower support roller is designated by 2b, and the upper work roller is designated by 3a and the lower work roller by 3b. The rolling stock is indicated at 4. The roll stand 1 has four stand columns, of which two stand columns which can be seen in the drawing are denoted by 5 and 6. The stand columns on one side of the roll stand 1 delimit between them the stand window 11, in which the chocks 7 of the support rolls and 8 of the work rolls are guided.

On the opposite, parallel to the rolling direction inner and outer sides of each column 5, 6 are horizontal (perpendicular to the plane of the drawing) arranged bars, which are denoted by 9 in Figure 1 and are described below with reference to Figure 2.

The drawing is a simplified representation of the construction, with insignificant parts being omitted. In FIG. 2, identical parts are initially identified identically. The bars 9 of the invention can be seen, which, as the arrow 10 indicates, are guided essentially horizontally on the support columns 5 and can be pivoted. The ends of the beams 9 protrude into the stand window 11 formed between the stand columns 5 and hold the chock 8 of the work roll 3a or 3b on both sides with their end faces. At the same time, the ends 9a of the beams engage behind 9b projections of the chocks 8, which are designated 8a. Each chock 8 of the support rollers 2a and 2b can be adjusted in the vertical direction on these projections 8a by pivoting the bars 9. For this purpose, the bars 9 are guided in guide bushes 13 which can be pivoted about the horizontal pivot axis 12, in recesses 14, the guide bushes 13 having openings in the longitudinal direction of the bars which form sliding guides. The guide bushes in turn are slidably guided on their cylindrical outer jacket surfaces 15 in corresponding bearing shells which are arranged in bearing blocks 16 attached to the stator columns 5. In order to enable both the pivoting movement of the bars 9 about the pivot axes 12 and the displaceability of the bars 9 in their longitudinal directions, elongated holes 17 are provided in the bars 9, which are adapted in their longitudinal extent to the displacement path of the bars 9.

In order to bend the work rolls 3a, 3b by pivoting the beams 9 about their pivot axes 12, brackets 18 are attached to the upright columns 5, to which pivotable bending cylinders 19, which act in the vertical direction, are articulated. The bending cylinders 19 are supported by slide guides 20 against the ends of the beams 9 which protrude on the side of the support columns 5 facing away from the stand window 11 and thus enable pivoting about the pivot axes 12. The displacement cylinders 21 are provided for displacing the beams 9 in the longitudinal direction. which are supported on the one hand at 22 on the support columns 5 and on the other hand at 23 on cross members 24, which in turn are provided at the free ends of the beams 9, each connecting two beams 9 forming a pair of beams.

The arrangement of the bending cylinders 19, two of which are provided, and the arrangement of the displacement cylinders 21 can be seen in FIG. 3, which represents a longitudinal section through the bending cylinders 19. Here, too, the same parts are labeled the same.

In Figure 4 it can be seen how the bars 9 are clamped after the displacement about their longitudinal axis and thus after the displacement of the chocks 3a, 3b. For this purpose, the stand column 5 of each roll stand 1 is pierced at 24, a tie rod 25 being guided through the hole and penetrating both the beams 9 in the region of the elongated holes 17 and the guide bushes 13. At one end, the pull rod 25 is provided with a head 26 forming an abutment, while at the other end a pressure medium cylinder 27 is attached, as well as plate spring assemblies 28. The head 26 of the pull rod 25 is stretched over the plate springs. The beams 9 are clamped and clamped in the guide bushes 13. In this way, the rollers can be fixed during the rolling process by fixing the chocks 8 between the ends 9a of the beams 9. The pressure medium cylinder 27 serves to release the clamping.

A variant of the invention is shown in FIG. 5. Here too, the stator columns of a four-high mill stand are designated 5, which are perforated in the rolling direction with bores as guides. The guides are labeled 30. Slidable beams 31 are guided through the guides 30 and fix the chocks 8 of the work rolls 3a, 3b on both sides in the desired displacement position at their ends 31a projecting into the stand window 11. To postpone the Beams 31 are provided on the end outside of the stator columns 5, displacement cylinders 32, which, coupled to the opposite beams 31, cause the work rolls 3a, 3b to be displaced via their chocks 8. For horizontal adjustment of the chocks and thus for bending the work rolls 3a, 3b, the horizontal projections 8a on the chocks 8 are engaged by vertically acting bending cylinders 33, which are arranged in the ends 31a of the beams 31 projecting into the stator window 11. By applying pressure medium to these bending cylinders 33, preferably through the bars 31, the bending of the work rolls 3a, 3b can be accomplished in any displacement position of the bars 31 in the bores 30 of the support columns 5. The displacement cylinders 32 for the beams 31 are supported on the respective column 5 by means of a cross member 34.

Claims (7)

Roll stand with support and work rolls for the rolling of sheets and strips, in which at least the upper and lower work rolls stored in chocks within the stand windows formed between the stator columns of the roll stands by reciprocal horizontal displacement by means of displacement drives effectively assigned to the chucks out of the common vertical plane positions are displaceable in which the vertical planes running through the roll axis of the upper work roll and the lower work roll intersect,
characterized,
that on the opposite inner and outer sides of each stand column (5,6), which run parallel to the rolling direction, there is a sliding and swivel bearing for one of two mutually parallel, essentially horizontal beams (9), which are supported on both sides by the stand columns (5, 6) ) also protrude into the stand window (11) and protrude from the roller stand (1) after the side facing away from the stand window (11), the ends of two pairs of bars protruding into the stand window (11) of one stand side each containing the relevant work roll chock of the upper ( 3a) and the lower work roll (3b) are supported synchronously adjustable on both sides in the vertical and horizontal directions, and the respective other projecting ends of these pairs of beams correspond with the displacements (21) - and with bending cylinders (19) which, between the roll stand (1) and the Arranged bars (9), the latter in opposite directions in the sliding bearings seven and / or swivel about the swivel axes (12) of the swivel bearings. Roll stand with support and work rolls for rolling sheets and strips according to claim 1,
characterized,
that each sliding and swivel bearing consists of axially parallel and axially parallel to the upright columns (5,6) and with respect to a upright column (5,6) around their horizontal central axes guide bushes (13), each centrally in the transverse direction from one of the beams ( 9) are broken through on both sides in the longitudinal direction of the recess (14) and are guided with their cylindrical outer lateral surfaces (15) on both sides of the longitudinal axis of the beams in bearing shells, which are in turn provided in bearing blocks (5, 6) arranged in bearing blocks (16). Roll stand with support and work rolls for rolling sheets and strips according to claim 1 or 2,
characterized,
that for bending the work rolls (3a, 3b) each bending cylinders (19) are provided, which are arranged on a bracket (18) on the stand column (5,6) on the one hand and on the other hand on the beam (9), the bending forces over the guide bushes (13) and the bearing shells are guided into the upright columns (5,6). Roll stand with support and work rolls for rolling sheets and strips according to one of Claims 1 to 3,
characterized,
that the coupling of a pair of beams is carried out on both sides of the upright columns (5, 6), cross bars (24) extending transversely to the beams (9). Roll stand with support and work rolls for rolling sheets and strips according to claim 2,
characterized,
that the guide bushes (13) on each side (13) of each swivel and sliding bearing on a common elongated hole (17) extending in the beam (9) in the beam (9) in the beam (9) in the beam (9) penetrating axis are arranged, which is designed as a spring-actuated tie rod (25) which clamps and clamps the beams (9) of the pair of beams against each other, while the release takes place hydraulically. Roll stand with support and work rolls for the rolling of sheets and strips, in which at least the upper and lower work rolls stored in chocks within the stand windows formed between the stator columns of the roll stands by reciprocal horizontal displacement by means of displacement drives effectively assigned to the chucks out of the common vertical plane positions are displaceable in which the vertical planes running through the roll axis of the upper work roll and the lower work roll intersect,
characterized,
that for the displacement of the work rolls (3a, 3b) in the horizontal direction, the stand columns (5,6) of the roll stand are broken in the rolling direction and each form guides (30) for horizontally projecting into the stand window (11) sliding beams (31), of which In each case two coaxially opposed beams (31) are assigned to a chock (8) which can be moved horizontally in the stand window (11) by synchronized displacement of these beams (31) and which for bending the work rolls (3a, 3b) in the vertical direction each beam ( 31) receives at least one vertically acting bending cylinder (33) at its end projecting into the stator window (11), each of which engages behind a projection (8a) on the chock (8). Roll stand with support and work rolls for rolling sheets and strips according to claim 6,
characterized,
that the ends of the upright window (11) of the bars (31) guided in the upright columns (5, 6) are connected to horizontally acting displacement cylinders (32) which are supported on the outside of the upright columns (5, 6).

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