U.S. patent application number 13/056786 was filed with the patent office on 2011-06-09 for rolling device.
This patent application is currently assigned to SMS SIEMAG AKTIENGESELLSCHAFT. Invention is credited to Christian Diehl, Achim Klein, Florian Lindner, Bernd Zieser.
Application Number | 20110132055 13/056786 |
Document ID | / |
Family ID | 41461540 |
Filed Date | 2011-06-09 |
United States Patent
Application |
20110132055 |
Kind Code |
A1 |
Diehl; Christian ; et
al. |
June 9, 2011 |
ROLLING DEVICE
Abstract
The invention relates to a rolling device comprising at least
two working rollers (2, 3) which are each mounted in a rolling
stand (6) by means of at least one working roller chock (4, 5),
wherein, to adjust a desired rolling nip (7), at least one of the
working rollers (2, 3) in the rolling stand (6) can be adjusted
relative to the other working roller (2, 3), in particular in the
vertical direction, wherein axial displacement means (8) are
provided by means of which a working roller (2, 3) can be displaced
in its axial direction relative to the rolling stand (6), wherein
the axial displacement means (8) comprise an actuating element (9)
which is arranged coaxially to the axis (10) of the working roller
(2, 3) to be displaced, and wherein at least one working roller (2,
3) is operatively connected to bending means (11) by means of which
a roller can be subjected to a bending moment. In order to make it
possible in a cost-effective manner to achieve the axial
displacement of the working rollers with the simultaneous
possibility of subjecting them to a bending moment, the invention
provides that, in order to adsorb the force generated by the
bending means (11), the working roller chock (4, 5) has arms (12,
13) which protrude laterally as viewed from the axis (10) of the
working roller (2, 3), wherein a pressure transmission element (15)
which can be displaced relative to the rolling stand (6), in
particular in the vertical direction, is arranged between an
element (14) of the bending means (11) that produces a pressure
force, in particular a piston, and the protruding arm (12, 13) of
the working roller chock (4, 5).
Inventors: |
Diehl; Christian;
(Hilchenbach, DE) ; Klein; Achim; (Kreuztal,
DE) ; Zieser; Bernd; (Netphen, DE) ; Lindner;
Florian; (Netphen, DE) |
Assignee: |
SMS SIEMAG
AKTIENGESELLSCHAFT
Dusseldorf
DE
|
Family ID: |
41461540 |
Appl. No.: |
13/056786 |
Filed: |
July 30, 2009 |
PCT Filed: |
July 30, 2009 |
PCT NO: |
PCT/EP2009/005525 |
371 Date: |
January 31, 2011 |
Current U.S.
Class: |
72/245 |
Current CPC
Class: |
B21B 31/18 20130101;
B21B 29/00 20130101; B21B 13/142 20130101 |
Class at
Publication: |
72/245 |
International
Class: |
B21B 31/18 20060101
B21B031/18 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 30, 2008 |
DE |
10 2008 035 702.2 |
Claims
1-8. (canceled)
9. A rolling device, comprising: a roll stand; at least one roll
chock; at least two work rolls mounted in the roll stand by the at
least one work roll chock, wherein at least one of the work rolls
is adjustable in the roll stand for adjusting a desired roll gap
relative to the other of the work rolls; bending means in operative
connection with at least one of the work rolls so that a bending
moment can be applied to the work rolls, the bending means
including an element for producing a compressive force, wherein the
work roll chock has overhang arms that extend laterally relative to
an axis of the work roll for receiving the force produced by the
bending means; a pressure transmission element arranged between the
element of the bending means for producing a compressive force and
the overhanging arm of the work roll chock, the pressure
transmission element being displaceable relative to the roll stand;
axial displacement means constructed as hydraulic piston/cylinder
units, wherein the axial displacement means includes an actuating
element formed as a piston arranged coaxially relative to the axis
of the work roll to be displaced; and a holding arm, an axial end
of the actuating element being fastened to the holding arm, which
is secured to the roll stand in a sliding guide so as to be capable
of translatory movement.
10. The rolling device according to claim 9, wherein the at least
one roll is adjustable in a vertical direction.
11. The rolling device according to claim 9, wherein the element of
the bending means is a piston.
12. The rolling device according to claim 9, wherein the pressure
transmission element is vertically displaceable relative to the
roll stand.
13. The rolling device according to claim 9, wherein the element of
the bending means producing the compressive force and the
overhanging arm of the work roll chock are positioned so that a
center axis of the element producing the compressive force
intersects the overhanging arm.
14. The rolling device according to claim 9, wherein a sliding
surface is provided between the element of the bending means
producing the compressive force and the pressure transmission
element and/or between the pressure transmission element and the
overhanging arm of the work roll chock.
15. The rolling device according to claim 9, and further comprising
on a block arranged fixedly on the roll stand, the bending means
being arranged on the block, and still further comprising a guide
that mounts the pressure transmission element to the block.
16. The rolling device according to claim 15, wherein the guide is
a vertical guide.
17. The rolling device according to claim 15, wherein the pressure
transmission element is a U-shaped horizontal section that at least
partially surrounds the block on three sides.
18. The rolling device according to claim 15, wherein the pressure
transmission element is an L-shaped vertical section extending
perpendicularly to the axis of the work roll, and at least
partially surrounds an upper side of the block.
19. The rolling device according to claim 15, and further
comprising a guide for supporting the pressure transmission element
on the roll stand.
20. The rolling device according to claim 19, wherein the guide for
supporting the pressure transmission element is a vertical
guide.
21. The rolling device according to claim 15, and further
comprising holding means arranged between the block and the
pressure transmission element for holding the pressure transmission
element on the block immovably in the horizontal direction relative
to the work roll.
Description
[0001] The invention relates to a rolling device with at least two
work rolls which are each mounted by means of at least one work
roll chock in a roll stand, wherein at least one of the work rolls
in the roll stand is adjustable relative to the other work roll for
adjusting a desired roll gap, particularly in the vertical
direction, wherein axial displacement means are provided by means
of which a work roll can be displaced relative to the roll stand in
the axial direction thereof, wherein the axial displacement means
include an actuating element which is arranged coaxially relative
to the axis of the work roll to be displaced, and wherein at least
one work roll is in operative connection with bending means by
means of which a bending moment can be applied to the work
roll.
[0002] A rolling device of this type is known, for example, from EP
1 436 104 B1. The rolling device disclosed in this document is
equipped with axial displacement means, so that the work rolls can
be moved in a desired axial position along the axial extension
thereof and can be held at that location. The axial displacement
means constructed as hydraulic piston-cylinder include a piston
which is fastened with one of its ends to a support arm which can
slide up and down on the roll stand in vertical direction, together
with the chock of the work roll.
[0003] The known rolling device further includes bending means for
applying a bending moment on the work roll. The bending means are
mounted between the chock of the work roll and the chock of the
adjacent back-up rolls. In the case of slight movements of the
lower work roll in the vertical direction, the bending means rest
between the chocks of the lower work roll and second portions on
the beams of the roll stand.
[0004] Accordingly, in the type of construction of rolling devices
known from EP 1 436 104 B1, the work roll displacement is realized
by an axial displacement device arranged coaxially at the work roll
chock, wherein the axial displacement device is moved out of the
roll stand when the work roll is exchanged with the set of rolls.
The work roll bending device is of "overhanging" construction, in
which the upper work roll chocks rest through the bending and
balancing cylinders in U-shaped recesses of the upper back-up roll
chocks. In this connection, the bending cylinders can be arranged
in the work roll chocks or, alternatively, in the back-up roll
chocks.
[0005] It is advantageous in this type of construction that, due to
the "overhanging" arrangement of the upper work rolls, a high roll
gap, for example, of up to (1200 mm) is possible. This makes it
possible to roll out high ingots on such a roll stand. Moreover,
the work roll displacement and bending devices can be moved out of
the roll stand when the set of rolls are moved out of the roll
stand and maintenance is performed outside of the roll stand. This
means that idle times in the plant for performing maintenance on
these devices do not occur.
[0006] Because of the coaxial arrangement at the set of rolls, the
axial displacement devices do not have to absorb tilting moments
which otherwise have to be taken into consideration in displacement
systems which are arranged stationary at the roll stand. This has a
positive effect on the dimensioning of the displacement devices
because a lower displacement force is required.
[0007] However, this type of construction has the disadvantage that
during the axial displacements of the work rolls, the upper set of
work rolls is pushed over the bending cylinders of the upper
back-up roll chocks to which balancing pressure is applied. The
frictional forces occurring as a result produce tilting moments
which may cause the back-up roll chocks to assume an inclined
position. In the case of a sudden application of the roll force to
the stand (initial pass impact) following the work roll
displacement it cannot be excluded that a local contact of bearing
bushings and neck bushings occurs at the back-up roll support--in
flood lubricated bearings, which may cause bearing damage due to
edge pressure or, in the case of roller bearings, individual
bearing rolls are subjected to an excess load application.
[0008] Also known in the art are bending devices which are
constructed in the manner of a "bending hood". This a work roll
bending system in which the hydraulic blocks are provided with
so-called "bending hoods", which ensure a good guidance of the work
roll chocks in the roll stand even in the case of high roll gaps
and simultaneously makes possible a displacement of the respective
work roll.
[0009] The device for axially displacing the work rolls is fastened
to one of the two roll stand posts. To each of the lateral support
parts ("displacement tube") of the respective work roll chocks, is
assigned a displacement cylinder unit. In this displacement
cylinder unit, the work roll chocks are arranged so as to be
displaceable in the vertical direction.
[0010] The advantage of this type of construction is that roll gaps
of up to about 550 mm can be realized. Due to the use of the
"bending hood", no moments are introduced into back-up roll
bearings when the work rolls are displaced. Another advantage is
the fact that no additional coupling of media hoses is required
because the bending and displacement devices are provided with
fixed tubes.
[0011] However, this concept has the disadvantage that because of
the arrangement of the displacement device outside at the stand
posts as well as the requirement that the forces occurring during
the rolling process must be absorbed by the displacement device
even if the roll ascent is high, which results in a large area and,
thus, heavy and expensive construction of the displacement
device.
[0012] Therefore, the invention is based on the object of providing
a rolling device of the above-mentioned type which avoids the
disadvantage of the type of construction mentioned first
hereinabove and utilizes the advantages of the subsequently
discussed solution. Accordingly, the high weight of the solution
discussed last should be avoided and a less expensive construction
is to be achieved. A high roll gap should also be made
possible.
[0013] In accordance with the invention, this object is met by
providing the work roll chock for receiving the force produced by
the bending means with laterally overhanging arms as seen from the
axis of the work roll, wherein between an element of the bending
means which produces compressive force, particularly a piston, and
the overhanging arm of the work roll chock is arranged a pressure
transmission element which is displaceable relative to the roll
stand, particularly in the vertical direction.
[0014] The axial displacement means are preferably constructed as
hydraulic piston/cylinder units. The actuating element of the axial
displacement means is preferably constructed in the form of a
piston, wherein the piston is fastened with one of its axial ends
to a holding arm which is secured on the roll stand in a guide,
preferably a slide guide, to be capable of translatory
movement.
[0015] The element of the bending means which produces the
compressive force and the cantilevering arm of the work roll chock
are preferably positioned in such a way that the center axis of the
element which produces the compressive force intersects the
overhanging arm.
[0016] A sliding surface is preferably arranged between the element
of the bending means which produces the compressive force and the
pressure transmission element and/or between the pressure
transmission element and the overhanging arm of the work roll
chock.
[0017] The bending means are advantageously arranged in a block
which is fixedly arranged at the roll stand and the pressure
transmission element is mounted on the block by means of a guide,
particularly by means of a vertical guide. The pressure
transmission element is constructed preferably U-shaped in the
horizontal cross section and surrounds the block from three sides
at least partially. The pressure transmission element is
constructed preferably L-shaped in a vertical section extending
perpendicularly on the axis of the work roll and surrounds the
block on its upper side at least partially.
[0018] The pressure transmission element can be supported on the
roll stand by means of a guide, particularly by means of a vertical
guide.
[0019] Holding means can be arranged between the block and the
pressure transmission element which hold the pressure transmission
element in horizontal position immovably relative to the work roll
at the block.
[0020] In accordance with the invention, the result is that an
axial displacement device is used which is arranged coaxially
relative to the axis of the work roll. However, the bending device
which is used simultaneously is constructed according to the type
of construction of "bending hood".
[0021] Because of the significantly lower weight and the components
of the displacement device which are technically simple,
significantly lower manufacturing costs can be achieved.
[0022] Because of the use of the bending device, no moments are
introduced into the back-up roll bearings during displacement of
the work rolls.
[0023] In the drawing, an embodiment of the invention is
illustrated. In the drawing:
[0024] FIG. 1 shows a portion of a rolling device in a perspective
view;
[0025] FIG. 2 is the front view of the rolling device according to
FIG. 1 in a sectional view taken along sectional line A-A according
to FIG. 3;
[0026] FIG. 3 is the top view of the rolling device in a sectional
view along sectional line B-B according to FIG. 2;
[0027] FIG. 4 shows the bending means of the rolling device in a
sectional view along sectional line C-C according to FIG. 3
[0028] The Figures show a rolling device 1 in which the two
interacting work rolls 2 and 3, which are each mounted in a work
roll chock 4 or 5, are arranged in a roll stand 6. For adjusting a
roll gap 7 between the two work rolls 2 and 3 it is provided that
the upper work roll chock 5 is adjustably constructed in the
vertical direction; accordingly the work roll chock 5 can be moved
in the vertical direction relative to the roll stand 6.
[0029] The work rolls 2, 3 are respectively supported on back-up
rolls 24 and 25, wherein the back-up rolls are supported in a
back-up roll chock 26 or 27, respectively. Accordingly, the
illustrated rolling device 1 has altogether four rolls. It should
be mentioned that the rolling device may also have additional
rolls, namely, intermediate rolls arranged between the work rolls
2, 3 and the back-up rolls 24, 25.
[0030] For introducing a bending moment into the work rolls 2, 3,
bending means 11 are provided. As can be seen particularly in FIG.
3, the bending means 11 are arranged in both axial end areas of the
work rolls 2, 3 and otherwise are arranged on the roll stand 6
inlet side and the outlet side (see FIG. 2). Accordingly,
altogether four bending means 11 are provided.
[0031] The bending means 11 have a block 20 which is arranged
fixedly at the roll stand 6, as can be seen particularly in FIG. 2.
The block 20 has cylindrical holes in which are arranged elements
14 that produce compressive force, i.e. pistons, to which hydraulic
pressure can be admitted. The pistons 14 have a center axis 18
which extends in the vertical direction.
[0032] It can further be seen in FIG. 2 that each work roll chock
4, 5 has overhanging arms 12 and 13 which are arranged laterally of
the axis 10 of the work roll 2, 3. The overhanging arms 12, 13
extend--away from the work roll 2,3--laterally outwardly and engage
over the pistons 14 and in particular their center axis 18.
[0033] Between the bending means 11 and particularly the pistons 14
thereof and the overhanging arms 12, 13 of the work roll chocks 4,
5 is arranged a pressure transmission element 15. This element 15
is equipped with two sliding surfaces 19 and 28 which are in
gliding condition between the pistons 14 and the pressure
transmission element 15, on the one hand, or between the pressure
transmission element 15 and the overhanging arm 12, 13 on the
other. As can be further seen, piston 14 and overhanging arm 12, 13
are positioned in such a way that the center axis 18 of the piston
14 intersects the overhanging arm 12, 13. This produces an optimum
force transmission from the bending means 11 to the work roll chock
4, 5.
[0034] The pressure transmission element 15 is arranged over a
vertical guide 29 on the block 20 and, thus, can move in the
vertical direction relative to the block 20 and, thus, to the roll
stand 6. In the same manner, another vertical guide is provided
which guides the pressure transmission element 12 in the upper area
at the roll stand 6, in particular a transverse girder of the
pressure transmission element 15.
[0035] The pressure transmission element 15 is constructed as a
"bending hood". This means that it is constructed U-shaped in a
horizontal section and surrounds the block 20 from three sides at
least partially, as can be seen best in FIG. 3. FIG. 2, on the
other hand, shows that the pressure transmission element 15 is
constructed L-shaped in a vertical section extending
perpendicularly on the axis 10 of the work roll 2, 3 and surrounds
the block 20 partially at its upper side. With its two legs (see
FIG. 3) the pressure transmission element 15 is arranged so as to
vertically slide against axial displacement forces but secured
against tilting at the three sides of the block 20. In addition,
the pressure transmission element is supported on the end face of
the block 20 facing the work roll 2 and, thus, can absorb high
horizontal forces which may be directed at the input side against
and on the output side with the roller direction.
[0036] As can further be seen, the pressure transmission element 15
is provided in or against the rolling direction with further
sliding surfaces which are fastened to the legs and which make
possible a support on the side surfaces of the roll stand 6 which
face the work roll 2.
[0037] To ensure that the pressure transmission element 15 remains
in position when the work roll 2, 3 is disassembled and does not
drop off from the roll stand 6 or from the block 20, holding means
23 are provided (see FIG. 3). The holding means 23 prevent the
pressure transmission element 15 from being displaceable in the
direct direction to the roll axis 10.
[0038] It can further be seen that axial displacement means 8 are
provided for axially adjusting the work roll 2, 3.
[0039] FIG. 4 shows that, in addition to the upwardly directed
compressive force producing elements 14 (pistons) of the bending
means 11, which act on the upper work roll chock 5, additional
force-producing elements 30 are provided which produce a downwardly
directed force and apply a bending force to the lower work roll
chock 4.
[0040] Accordingly, it can be stated in summary that displacement
devices are hydraulic piston/cylinder units arranged on the
operator's side of the work roll chocks. The piston of the
piston/cylinder unit is connected to the holding arms guided in the
corresponding chocks. Locks arranged at the outer side of two
girders of the roll stand post arranged on the operator's side
prevents during the rolling operation a horizontal movement of the
holding arms and, thus, an axial movement of the piston. By
applying a pressure on the piston side or the rod side of the
piston/cylinder unit, an axial displacement of the work rolls
mounted in the chocks is achieved.
[0041] The bending device is characterized by hydraulic blocks with
"bending hoods", which ensures a good guidance of the work roll
chock in the roll stand even at high roll gaps and simultaneously
facilitates a displacement of the respective work roll for a
targeted change of the profile of the rolling stock traveling
through the roll gap by means of the displacement device.
LIST OF REFERENCE NUMERALS
[0042] 1 Rolling device [0043] 2 Work roll [0044] 3 Work roll
[0045] 4 Work roll chock [0046] 5 Work roll chock [0047] 6 Roll
stand [0048] 7 Roll gap [0049] 8 Axial displacement means [0050] 9
Actuating element [0051] 10 Axis of the work roll [0052] 11 Bending
means [0053] 12 Arm [0054] 13 Arm [0055] 14 Element producing the
compressive force [0056] 15 Pressure transmission element [0057] 16
Holding arm [0058] 17 Guide [0059] 18 Axis of the pressure
transmission element [0060] 19 sliding surface [0061] 20 Block
[0062] 21 Guide [0063] 22 Guide [0064] 23 Stop [0065] 24 Back-up
roll [0066] 25 Back-up roll [0067] 26 Back-up roll chock [0068] 27
Back-up roll chock [0069] 28 Gliding surface [0070] 29 Vertical
guide [0071] 30 Force-producing elements
* * * * *