|Title of Invention||
A DEVICE FOR REGULABLE INFLUENCING OF THE FRICTION FORCES BETWEEN THE GUIDE SURFACES AND CONTACT SURFACES OF BEARING CHOCKS, WHICH ARE GUIDED IN THE HOUSING WINDOWS OF ROLL STANDS
|Abstract||A device for controllably influencing the friction forces between the guide surfaces and the contact surfaces of bearing chocks of the rolls guided in the housing windows of roll stands includes planar support plates for supporting the guide surfaces, wherein the support plates are guided so as to be slidable perpendicularly relative to the guide or contact surfaces of the housing window and the bearing chock, and wherein a device is provided for applying pressure to the rear side of each support.|
The present invention relates to a device for controllably influencing the friction forces between the guide surfaces and the contact surfaces of bearing chocks of the rolls guided in the housing windows of roll stands.
Devices of this type have the purpose of counteracting vibrations which occur frequently during rolling of sheet metal strips in cluster roll stands, particularly at high rolling speeds resulting in the danger of the occurrence of vibration problems. These vibrations may lead to surface damage, such as chatter marks on the strips and may also negatively affect the service life of the rolls. If it is necessary to roll at lower rolling speeds in order to avoid these vibrations, the productivity of the rolling train decreases and the operational costs increase.
It has already been proposed in the past to counteract these vibration problems by producing a friction force between the
guide and contact surfaces of housing windows and bearing chocks by using hollow bodies which were expandable by means of hydraulic pressure. These expandable hollow bodies are mounted in the housing windows of the roll stands and act on the contact surfaces of the bearing chocks. While these hollow bodies result in an increase of the friction forces between the guide and contact surfaces of housing windows and bearing chocks, they have the disadvantage that they act only spherically on the contact surfaces of the bearing chocks and do not act uniformly over the entire surfaces thereof. A change of the contact pressures cannot be carried out or is very difficult, to carry out. A defined contact pressure and friction force cannot be achieved or is very difficult to achieve.
SUMMARY OF THE INVENTION
therefore, it is the primary object of the present invention to improve the roll stand arrangement of the devices of the type described above in such a way that a variable force application over the entire contact surfaces of the bearing chocks is made possible in order to produce defined friction forces, independently of the conditions at any given time with respect to rolling technology.
In accordance with the present invention, this object is met by planar support plates for supporting the guide surfaces, wherein the support plates are guided so as to be slidable
perpendicularly relative to the guide or contact surfaces of the housing window and the bearing chock, and wherein means are provided for applying pressure to the rear side of each support plate.
In accordance with another feature of the present invention, a piston/cylinder unit for applying pressure on the rear side of the support plate is mounted in the roll housing.
Finally, exchangeable wear plates provided with the contact surface may be placed on the support plates.
The device according to the present invention makes it possible to produce defined contact forces and friction forces at the bearing chocks in the housing window of the roll stand while bridging the operational play, i.e., to produce in a targeted manner defined contact forces and friction forces independently of the conditions with respect to rolling technology.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its, operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWING
in the drawing:
The single Figure of the drawing is a sectional view of the device according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The drawing is a schematic partial view of a housing window SF formed in the housing posts SHI, SH2 of a roll stand, otherwise not illustrated in detail, as seen in the axial direction of the rolls. The bearing chock LE of the roll W is guided on the housing window SF between the guide surfaces FFl and FF2 of the window so as to be movable up and down in the direction of the doule arrow DP. A recess AS is provided in the surface of the housing window SF of the housing post SHI on the left as seen in the drawing. A planter plate PL is placed in the recess AS so as to be slidable perpendicularly of the guide surface FFl. The plate PL has on its side facing the bearing chock and the contact surface AF thereof the corresponding guide surface FFl and the piston of a piston/cylinder unit KZA mounted in the housing post SH acts on the rear side of the plate PL. A wear plate, not shown in the drawing, can be placed on the surface of the plate PL facing the contact surface AF of the bearing chock LE, wherein one side of the wear plate then forms the guide surface FFl.
Using hydraulic control units, not shown, the piston/cylinder unit KZA can move the plate PL in the recess AS over the adjustment distance AW against the bearing chock LE,
This produces the previously calculated contact forces FP and, resulting from these contact forces FP, the friction forces FR between the guide surfaces FFl and FF2 of the housing window SF and the contact surfaces AFl and AF2 of the bearing chock LE,
The plate PL can be used on the drive side or on the operator side in back-up rolls, intermediate rolls and also the work rolls of a roll stand.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.
1. A device for controllably influencing friction forces between guide surfaces and contact surfaces of bearing chocks of rolls guided in housing windows of roll stands, the device comprising planar support plates supporting the guide surfaces arranged on the housing windows so as to be movable perpendicularly of the guide surfaces and the contact surfaces, and means for applying a pressure against rear sides of the support plates.
2. The device according to claim 1, wherein the means for applying pressure on the rear sides of the support plates are piston-cylinder units.
3. The device according to claim 1, further comprising wear plates exchangeably mounted on the support plates,
4. A device for controllably influencing friction forces between guide surfaces and contact surfaces of bearing chocks of rolls guided in housing windows of roll stands, substantially as herein described with reference to the accompanying drawings.
|Indian Patent Application Number||221/MAS/2000|
|PG Journal Number||08/2007|
|Date of Filing||16-Mar-2000|
|Name of Patentee||M/S. SMS SCHLOEMANN-SIEMAG AKTIENGESELLSCHAFT|
|Applicant Address||EDUARD-SCHLOEMANN-STRASSE 4 40237 DUSSELDORF|
|PCT International Classification Number||B21B31/07|
|PCT International Application Number||N/A|
|PCT International Filing date|