US2927489A

US2927489A - Means for keeping working rolls in contact with backing rolls and supporting rollers in rolling mills

Info

Publication number: US2927489A
Application number: US578285A
Authority: US
Inventors: Teutsch Arno
Original assignee: Schloemann AG
Current assignee: Schloemann AG
Priority date: 1955-04-18
Filing date: 1956-04-16
Publication date: 1960-03-08
Anticipated expiration: 1977-03-08
Also published as: FR1150806A; GB792523A

Description

CH LS I March 8, 1960 2,927,489 N CONTACT WITH BACKING LERS IN ROLLING MILLS 2 Sheets-Sheet l A. TEUTS MEANS FOR KEEPING WOR G ROLLS AND SUPPOR G 1956 Filed April 16,

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MEANs RoR KEEPING WORKING RoLLs IN CONTACT WITH BACKING n ROLLS AND SUPPORTING ROLLERS IN ROLLING MILLS Flled Aprll 16, 1956 2 Sheets-Sheet 2 gil i TG1/wch United States Patent vC n MEANS FOR KEEPING WORKING ROLLS IN CON- TACT WITH BACKING ROLLS AND SUPPORT- ING ROLLERS IN ROLLING MILLS Arno Teutsch, Hosel, Dusseldorf, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany Application April 16, 1956, Serial No. 578,285 Claims priority, application Germany April 1S, 1955 3 Claims. (Cl. 80-38) This invention relates to means for keeping the working rolls in contact with their supporting or backing rolls and supporting rollers in those four-roll cold-rolling roll stands in which the working rolls are supported in a horizontal position on the one hand by their displacement out of the plane containing the axes of the backing rolls and on the other hand by supporting rollers bearing upon the roll bodies. Since moreover the working rolls, with a view to the rolling of thin, hard strips, are of very small diameter, they cannot be driven directly, but are driven by frictional contact with the positively driven backing rolls.

This frictional drive is satisfactorily effected as long as the material that is being rolled is present between the working rolls, and the roll pressure provides for pressing the working rolls rmly enough against their backing rolls. When the rolled material comes to an end, however, a frictional drive is no longer ensured. Likewise the contact of the working rolls with the backing rolls and supporting rollers can no longer be ensured, since this is conditioned by the forces acting in the roll gap. Devices must therefore be provided which constantly press the working rolls against their backing rolls and supporting' rollers.

In order to keep the working rolls in contact with the backing rolls in four-roll cold-rolling roll stands it has already been proposed to provide, at each end of the working rolls, a pair of rollers, the rollers of each pair being urged towards on another by springs, while at the same time the working rolls are urged asunder and towards the backing rolls. With these appliances it is only possible to cause the vworking rolls to bear against the backing rolls, but not to keep the working rolls in constant contact with the supporting rollers. Keeping the Working rolls in contact with the backing rolls and also the supporting rollers would be possible only by means of rollers or pressure pieces pressed toward the supporting rollers on one side between the working rolls. In any case, however, these appliances do no-t permit the roll gap to be opened as widely as might be desired, since ultimately the distance between the rolls would become greater than the diameter of the pressure rollers.

Now the object of the present invention is to provide a means which will keep the working rolls unconditionally in contact with the supporting rollers and with the backing rolls, and which will follow the movements of the backing rolls during adjustment. i

For this purpose, according to the invention, on each end of the Working rolls, on the side remote from the supporting rollers, a pressure piece is caused to act, which is movably mounted on one end of a lever arm, which is so pivoted to a part of the housing as to be rockable in a radial plane of the Working roll and is arranged approximately parallel to the plane containing the axes of the backing rolls. The lever is rockable towards the working roll, and can be rocked in this direction by a stressing device acting upon it, which is likewise sup- 2,927,489 Patented Mar. 3, 1960 ported in the housing part, whereby the pressure piece can be brought into contact with the working roll.

A rigid supporting of the working roll in the direction of the pressure pieces is obtained, according to a further feature of thisv invention, by providing, as the stressing device, a toggle-lever mechanism, an eccentric, or a hydraulic lifting cylinder provided with a shut-off valve. By arranging a lifting cylinder as the stressing device, the time required for assembling or dismantling the working rolls is considerably shortened.

IInv order that the point of attachment of. the pressure piece may always remain in its most advantageous position near to the roll gap, and that this position may not be altered even with the re-facing of the working rolls and supporting rollers, the invention further provides that the pivot by which the lever that carries the pressure.

piece is pivoted to the housing part is arranged in a slot or the like in the housing part, in which it is displaceable towards the working roll.

In the rolling mills of the kind to which this invention relates, there is, however, frequently interposed, between the working rolls and the supporting rollers that support them in a horizontal position, an intermediate roll, so as to be independent, in selecting the diameter of the working rolls, of the diameter of the supporting rollers, which is fixed as a result of the horizontal supporting forces, and also in order to be able to bring the supporting rollers into contact with the backing rolls, since the working rolls can by this means receive an additional frictional drive through the medium of the supporting rollers and the intermediate rolls, and the parallelism of the axes of the backing rolls and the working rolls is ensured.

Provision is therefore made to render the means provided according to this invention for supporting the-working rolls available when employing an intermediate roll between the working rolls and the supporting rollers. In particular, a separate means for supporting the intermediate roll is to be avoided. Y

According to this feature of the invention, when employing intermediate rolls, each intermediate roll, together with its associated working roll, is journalled in two arms, which are rockable about the axis ofthe supporting rollers, and which keep the axes of the intermediate roll, the working roll and the supporting rollers in one plane. `In this case the bearing pieces mounted upon the ends of the intermediate rolls are guided in grooves extending along the rockable arms, and are movable in such a way as to permit the axes of the working rolls, the intermediate rolls and the supporting rollers to approach one another.

The diameter of the working rolls does not as a rule permit the working rolls to be journalled in the usual manner in the arms that hold their axes in the same plane with the axes of the intermediate rolls and the supporting rollers, since the bearings should not exceed the diameter of the working rolls. It is therefore provided, according to a further feature of the invention, to arrange, at the end of each arm, a pressure piece displaceable towards the bearing of the working rolls, in the direction of the plane containing the axes of the working roll, the backing roll and the supporting rollers, this pressure piece half embracing, like a fork, the bearing of the working roll. The arms, rockable relatively -to the axis of the supporting rollers, are here to be undisplaceable relatively to the axis of the supporting rollers in particular, whereas the pressure pieces arranged on the arms are displaceable towards the bearing of the working roll by the force of a spring or of a hydraulically or pneumatically actuated piston. Similarly the bearings of the intermediate roll are to be displaceable in guides on the arms in the same direction as the pressure pieces embracing the working-roll bearings. t

One lconstructional example according to the invention is illustrated in the accompanying drawings, in which: Y

Figures l and 2 show a side View and a plan of the apparatus with a liftinglcyliuders the Stressing device.

Figure l and Figure 2 show one possibility of supporting the working rolls, which are here denoted by f 1b and 2b. In order still to keep the point of engagement 25 o f the pressure pieces 11b and 12b to the working rolls 1b and 2b as near to the roll gap as possible, the pressure pieces A11b and 12b are herearranged on lever arms 2 6, which, for the adjusting of the pressure pieces 11b and 12b, are mainly displaced towards the working rolls 1b and 2b in guides 27, extending in the housing parts 6b and '7b peipendicularly to plane V9b containing the axesk of the Working rolls. placements of the working rolls 1b and 2b are allowed for by guiding the lever arms 26 by bolts 2S in slots 29 in` guides V217. The end position of the bolts 2S can be adjusted by means of set screws 30.

By means of lifting cylinders 32 which are roc-liable in theV housing parts 6b and '7b about bolts 31, and the pistons 33 of which are pivoted by way of pins 34 to the arms 26, the pressuregp'ieces 11b and 12b can be brought into contact with the bearings 35 of the working rolls 1b and 2b. A valve, not shown, shuts off the return of the pressure medium from the lifting cylinders 32, so that the supporting of the working rolls 1b and 2b in a horizontal direction is etected in an absolutely rigid manner by the pressure pieces 11b and 12b.

A further peculiarity of the construction illustrated consists in the provision of intermediate rolls 36 and 37 between the working rolls 1b and 2b and the supporting

rollers

38 and 39, whereby these can assist in transmitting the torque from the motor-driven backing rolls 3b and 4b to the working rolls 1b and 2b.

Here the intermediate rolls 36 and 37, with their bear- The vertical dising pieces4 40, are freely slida'ble in grooves 41 in arms e 43, which are rockable about the axes 42 of the supporting rollers. These arms 43 are supported by way of forked pressure pieces `#t4 on the bearings 35 ofthe working rolls 1b and 2b. The pressure pieces dt-,tor the purpose of reliably clamping the bearings 35 of the working rolls 1b and 2b between themselves and the pressure pieces 11b and 12b even when the axial distance of the working rolls 1b and 2b and of the supporting

rollers

38 and 39 changes, are connected with the arms 43 by way of pistons 46 guided in straight lines in cylinder spaces A45. By causing pressure uid to act upon the pistons 46, the pressure pieces 44 are caused to press 'against the bearings 35 of the working rolls 1b and 2b.

In order that the supporting

rollers

38 and 39, and also the working rolls 1b and 2b, may be kept in contact with the backing lrolls 3b and 4b even when the backing rolls 3b and 4b change their distance apart upon adjustment, the carriers 47 of the supporting

rollers

33 and 39 are so supported on supporting bridges 48 as to be slidable in a vertical direction. To the carriers 47 are rockably pivoted at 49 tension links 50, which are connected with levers 52., rockable about bolts 51. The bolts 51 are mounted in the'supporting bridges 48 fitted to a standard 53. By means of pressure cylinders 54, hearing at one end against the supporting bridges 48 and at the other end against the levers 52,-the frictional bearing of the supporting rollers 33 and 3 9 and of the working rolls ib and 2b against the backing4 rolls 3b and 4b is ensured by the levers '52 and the tension links 50.

i claim: s

l. A multi-roll stand, comprising: a roll housing, including two supporting bridges, two working rolls'supported in the roll housing, two motor-driven backing rolls, journaled in the roll housing, driving the worling rolls by' friction, the piane containing the axes lof the working rolls being oit-set out of the plane containing the axes of the backing rolls, two carriers supported by and vertically slidabie on the supporting bridges of the roll housing, supporting roller means, at least one for each working roll, journalled in thesaid carriers on that side of the plane containing the axes of the working rolls which is remote from the plane containing the axes of the backing rolls, separate adjustable pressure pieces engaging the necks of the working rolls, intermediate rolls,

one between each working roll and its supporting roller means, power-operated means pressing each working roll against its intermediate roll and thereby pressing the intermediate roll against its supporting roller means, further power-operated means on the supporting bridges pressing the supporting rolle-r means into frictional engagement with their backing rolls, and arms rock-able about the axes of the supporting roller means, the working and intermediate rolls being iournaled in bearings slidable on the roc'lrable arms.

2. A multi-roll stand as claimed in claim l, the said rockable arms each being forked at its free end, and the forked ends of these arms embracing the ends of the working rolls and exerting a resiliently yielding thrust against them.

3. A multi-roll stand as claimed in claim 1, compris- 'ing lever arms rockably mounted on the roll housing, each pressure piece being rockably mounted at the free end of one of these lever arms in such a position that it can be swung towards and away from its associated working roll on the side remote from the supporting roller means, and pivot bolts severally connecting the pressure pieces with` the lever arms.

Reiierences Cited in the le of this patent UNITED STATES PATENTS 1,892,933 Coryell Jan. 3, 1933 2,160,767 Wadsworth May 30, 1939 2,601,792 Dahlstrom July l, 1952 2,685,807 Hudson Aug. l0, 1954 FOREIGN PATENTS 752,351 Great Britain July 1l, 1956 1,097,650 lFrance Feb. 23, 1955