U.S. patent application number 14/352105 was filed with the patent office on 2014-10-02 for stripper for a work roll of a rolling stand.
This patent application is currently assigned to SMS SIEMAG AG. The applicant listed for this patent is Stephan Fischer, Andreas Loehr. Invention is credited to Stephan Fischer, Andreas Loehr.
Application Number | 20140290325 14/352105 |
Document ID | / |
Family ID | 46888392 |
Filed Date | 2014-10-02 |
United States Patent
Application |
20140290325 |
Kind Code |
A1 |
Fischer; Stephan ; et
al. |
October 2, 2014 |
STRIPPER FOR A WORK ROLL OF A ROLLING STAND
Abstract
The present invention relates to a stripper (11) for a work roll
of a rolling stand, in particular a hot rolling stand, wherein the
stripper tip (11) has a stripper tip (5) that makes a contact with
the work roll (1), and a first screening element (8) for screening
a rolled material (10) from cooling water of the rolling stand,
wherein there is provided a second screening element (6) for
screening the first screening element (8) from being thermally
loaded by the rolled material (10).
Inventors: |
Fischer; Stephan;
(Hilchenbach, DE) ; Loehr; Andreas; (Herdorf,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Fischer; Stephan
Loehr; Andreas |
Hilchenbach
Herdorf |
|
DE
DE |
|
|
Assignee: |
SMS SIEMAG AG
Duesseldorf
DE
|
Family ID: |
46888392 |
Appl. No.: |
14/352105 |
Filed: |
September 3, 2012 |
PCT Filed: |
September 3, 2012 |
PCT NO: |
PCT/EP2012/067053 |
371 Date: |
June 4, 2014 |
Current U.S.
Class: |
72/201 |
Current CPC
Class: |
B21B 13/00 20130101;
B21B 2027/103 20130101; B21B 27/10 20130101 |
Class at
Publication: |
72/201 |
International
Class: |
B21B 13/00 20060101
B21B013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 18, 2011 |
DE |
10 2011 084 735.9 |
Claims
1. A stripper (11) for a work roll of a rolling stand, in
particular a hot rolling stand, comprising a stripper tip (5) for
making contact with the work roll (1) of the rolling stands, and a
first screening element (8) for screening a rolled material (10)
from cooling water of the rolling stand, characterized by wherein a
second screening element (6) for screening the first screening
element (8) from being thermally loaded by the rolled material, and
wherein an insulation element (7) is provided between the first
screening element (8) and the second screening element (6) for
thermally insulating both thermal elements (8, 6) from each
other.
2. A stripper according to claim 1, wherein the first screening
element (8) is spaced from the second screening element (6) by a
distance from 0.5 cm to 5 cm, preferably, by a distance from 1 cm
to 4 cm, and even more preferably, by a distance from 2 cm to 3
cm.
3. (canceled)
4. A stripper according to claim 1, wherein there is provided at
least one third screening element spaced from the first screening
element (8) and/or from the second screening element (6), and/or at
least one second insulation element is arranged between the third
screening element and the first and/or second screening
element.
5. A stripper according to claim 1, wherein at least two screening
elements (6, 8) form a sandwich structure with each other.
6. A stripper according to claim 1, wherein the at least two
screening elements (6, 8) are connected with each other at a
distance from each other by screw connection means and/or a
spacer.
7. A stripper according to claim 1, wherein the stripper tip (5) is
formed as a separate constructional component and is advantageously
connected with the first screening element (8) and/or the second
screening element (6).
8. A stripper according to claim 1, wherein the screening elements
(6, 8) are pivotally supported relative to the rolling stand.
9. A stripper according to claim 1, wherein at least one screening
element (6, 8) extends, as one piece, over the support length of
the work roll (1).
10. An apparatus for cooling a work roll (1) of a rolling stand,
comprising a cooling water-spraying apparatus (3) for spraying
cooling water on the work roll (1); and a stripper (11) arranged
between the rolled material (10) and the cooling water-spraying
apparatus (3), wherein the stripper has a striper tip (5) for
making contact with the work roll (1) of the rolling stands, a
first screening element (8) for screening a rolled material (10
from cooling water of the rolling stand, a second screening element
(6) for screening the first screening element (8) from being
thermally loaded by the rolled material, and an insulation element
(7) provided between the first screening element (8) and the second
screening element (6) for thermally insulating both thermal
elements (8, 6) from each other.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a stripper for a work roll
of a rolling stand in particular a work roll of a hot rolling
stand, and an apparatus for cooling a work roll of a rolling
stand.
STATE-OF-THE ART
[0002] In rolling stands, in particular in hot rolling stands,
strippers are used for upper and lower work rolls at an inlet and
an outlet of a respective rolling stand. The strippers typically
permanently make contact with the work rolls during a rolling
operation. The contacts are carried out with a stripper tip that
makes contact with a respective work roll. The strippers are formed
for screening the surface of the rolled material from the roll
cooling water and are in a position to eventually strip the rolled
material clinging to the work rolls.
[0003] During a rolling process, the work rolls are subjected to
high thermal loads. The heat, which is applied to the work rolls,
is transferred in the rolling gap primarily by contact of the work
rolls with the rolled material, wherein the input heat energy is
increased additionally by a rolling heat produced as a result of
plastic deformation of the rolled material. Further, friction heat,
which is produced by friction between the rolled material and the
work roll and in the contact region between the work roll and the
usually provided, back-up roll, is also applied to the work
rolls.
[0004] In order to prevent a premature or excessive wear of the
work rolls by thermal loads, the roll cooling is of a paramount
importance. In particular, it is attempted, by an appropriate outer
cooling of the roll, in particular at the outlet side, to remove
the work roll heat, which is applied to the roll outer surface in
the rolling gap, efficiently and to a most possible extent, as soon
as possible after the rolled material exits from the rolling gap to
prevent penetration of the heat into the depth of the roll.
[0005] Correspondingly, the cooling water is sprayed on the work
roll as soon as possible. The strippers take care that the cooling
water, which is sprayed on the work roll from outside, makes no
contact with the rolled material and/or reduction of the quality of
the rolled material is prevented.
[0006] Because the work roll outer cooling takes place as soon as
possible after the roll material exits the rolling gap, the
strippers are arranged above the rolled material as low as possible
and are arranged as close as possible to the roll gap. The
strippers forms partially a component of respective inlet and
outlet guides and are correspondingly at least rotatably supported
or often are even mounted on gimbals. The strippers are pressed
against respective work rolls either pneumatically or hydraulically
or by a contact with a pressure mass.
[0007] Because the stripper typically is arranged very low above
the rolled material, it is subjected to a high thermal load on its
side adjacent to the rolled material, on one hand. On its side
remote from the rolled material, the stripper is impacted by the
cooling water which it should prevent from reaching the rolled
material. Correspondingly, the prior art strippers are subjected to
very high temperatures on one of their sides and to cooling water
temperatures on their other sides. Thereby, unavoidably, a
different thermal expansion on respective stripper sides takes
place which results in wobbling of the stripper and, e.g., no
complete sealing can be provided, e.g., in the middle region of the
rolled material.
[0008] Stripper elements are disclosed, e.g., in DE 2008 019 548 A1
and in EP 0 899 030 A2.
DESCRIPTION OF THE INVENTION
[0009] Correspondingly, the object of the invention is to provide a
stripper and a device for cooling work rolls of a rolling stand
which would insure a better sealing of the cooling water during
operation.
[0010] This object is achieved with a stripper having features of
claim
[0011] Advantageous embodiments are set forth in sub-claims.
[0012] Correspondingly, the stripper for a work roll of a rolling
stand, in particular of a hot rolling stand, has a stripper tip for
making contact with the work roll of the rolling stand, and a first
screening element for screening a rolled material form cooling
water of the rolling stand is provided.
[0013] According to the invention, there is provided a second
screening element for screening the first screening element from
being thermally loaded by the rolled material.
[0014] By providing a first screening element for screening the
rolled material from the cooling water and a second screening
element for screening the first screening element from being
thermally loaded by the rolled material, it could be achieved that
both screening elements, namely the first screening element and the
second screening element can be so adapted to respective prevailing
thermal conditions that the stripper tip makes a constant contact
with a respective work roll.
[0015] The first screening element is advantageously spaced from
the second screening element by a distance from 0.5 cm to 5 cm,
preferably, by a distance from 1 cm to 4 cm, and even more
preferably, by a distance from 2 cm to 3 cm.
[0016] In this way, screening of the first screening by the second
screening element can be achieved.
[0017] In addition, in this way, a parallelogram effect is achieved
when the first screening element and the second screening element
are subjected to a different temperature expansion due to different
temperature action.
[0018] According to an advantageous embodiment, and insulation
element is provided between the first screening element and the
second screening element for thermally insulating both screening
elements from each other.
[0019] The second screening element that serves for screening the
thermal load applied by the rolled material is subjected to
noticeably higher temperature than the first screening element that
keeps the cooling water away from the rolled material. In this way
wobbling of the stripper can be prevented because a noticeable
temperature difference of different sides within a single material,
which is known in the state-of-the art, is prevented. Thus, the
stripper according to the present invention wobbles much less or
mostly not at all, so that the screening by the stripper of the
strip middle region can be achieved and set in a controlled
manner.
[0020] According to a particularly advantageous embodiment, at
least one third screening element spaced from the first screening
element and/or from the second screening element, and/or at least
one second insulation element is arranged between the third
screening element and the first and/or second screening
element.
[0021] Thereby, a sandwich structure is provided advantageously for
at least two screening elements. This can be achieved with a
corresponding multi-part construction of the stripper in form of a
sandwich construction, in particular with the inwardly located
insulation layer. The insulation layer separates the side with a
high thermal load from the side with a low thermal load.
[0022] Advantageously, the two screening elements are connected
with each other by screw means, preferably with use of spacers.
[0023] A particular efficient construction is achieved with at
least two screening elements which are spaced from each other and
are connected with each other by screw means and/or a spacer.
[0024] In a particularly advantageous embodiment the stripper tip
is formed as a separate constructional component that can be
quickly replaced, using a simple lock. By providing a stripper as a
separate component, it is achieved that a defective and/or used
stripper tip can be replaced quickly and efficiently, without
interrupting the apparatus operation for a noticeably long period
of time. On the other hand, the stripper tip can be formed of
another material than the first and second screening elements.
[0025] Advantageously, the stripper is pivotally supported on the
rolling stand as a unit so that a contact of the stripper with the
outer surface of the work roll is insured even if the work roll
axis moves or is displaced.
[0026] In order to achieve an adequate screening, at least one
screening element extends, as one piece, over the support length of
the work roll.
[0027] The object of the invention is also achieved with an
apparatus for cooling of work roll of a rolling stand having the
features of claim 10.
[0028] An apparatus for cooling a work roll in a rolling stand
includes a cooling water-spraying apparatus for spraying cooling
water onto the work roll, and the above-described stripper, wherein
the stripper is arranged between the rolled material and the
cooling water-spraying apparatus.
BRIEF DESCRIPTION OF THE DRAWING:
[0029] Advantageous further embodiments and features of the present
invention will be explained in detail by the following description
of the drawing figure. It is shown in:
[0030] FIG. 1 an upper outlet stripper according to an exemplary
embodiment of the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0031] Below, a preferred embodiment will be described with
reference to FIG. 1.
[0032] Correspondingly, there is provided a stripper 11 the
stripper tip 5 of which makes a contact with a work roll 1 of a not
explicitly shown, rolling stand of a hot rolling train. The work
roll 1 is supported, in a known manner by a back-up roll 2.
[0033] The work roll 1 is cooled in a known manner. In addition to
a known inner cooling of the work roll 1, it is also cooled from
outside by being sprayed with cooling water.
[0034] With the outer cooling, a cooling water apparatus 3 cools
the work roll 1 after a rolled material 10 left the rolling gap.
The cooling water apparatus 3 applies a large amount of water
directly to the work roll 1. The stripper 1 is arranged between the
rolled material 10 and the cooling water apparatus 3 in order to
prevent contact of the rolled material 10 with the cooling water.
Cooling of the rolled material 10 within a respective rolling mill
train is undesirable.
[0035] It is advantageous when the stripper 11 with the stripper
tip 5 is so arranged that the cooling water comes into contact with
the work roll 1 as soon as possible after a respective surface
element exits the rolling gap. In other words, the stripper tip 5
is advantageous arranged as close as possible to the rolling gap.
With this rapid cooling, it is achieved that the heat from the
outer surface of the work roll 1 does not penetrate deep into the
work roll 1 or that the volume of the work roll does not change and
it, correspondingly, cannot be damaged.
[0036] The stripper tip 5 extends advantageously over the entire
support length of the work roll 1 in order to achieve uniform
stripping and uniform cooling of the work roll 1.
[0037] The stripper 11 is pivotally supported by a bearing journal
4. A pneumatic cylinder 12, which is arranged at an end of the
stripper 11 opposite the stripper tip 5, presses the stripper tip 5
against the work roll 1. The bearing journal 4 is correspondingly
arranged between the stripper tip 5 and the pneumatic cylinder
12.
[0038] In addition to the stripper tip 5, the stripper includes a
screening element 8 for screening the rolled material 10 from the
cooling water applied by the cooling water apparatus 3.
[0039] There is also provided a second screening element 6 for
screening the first screening element 8 from being thermally loaded
by the rolled material 10. The second screening element 6 is spaced
from the first screening element 8. In other words, there are
provided two screening elements 8 and 6 spaced from each other,
wherein the first screening element protects the rolled material 10
from a contact with the cooling water from the apparatus 10, and
the second screening element 6 protects the first screening element
from an excessive heat.
[0040] The second screening element 6 is provided on the side of
the stripper 11 adjacent to the rolled material 10.
Correspondingly, the second screening element 6 screens the large
radiation heat of the rolled material 10. In this way, the
excessively large temperature gradient in the thickness direction
of the screening element 8 is prevented, whereby a disadvantageous
heat deformation of the stripper 11 can be avoided.
[0041] Even when, in the considered embodiment, heat deformation of
the first screening element 8 and/or the second screening element 6
takes place, a parallelogram displacement of both screening
elements 8 and 6 relative to each other is produced in a typical
manner and which is compensated right away by the stripper 11 being
pivoted about the bearing journal 4 by the pneumatic cylinder
12.
[0042] The first screening element 8 and the second screening
element 6 are connected with each other by a fastening element 9
which is shown schematically. In order to insure spacing between
the first screening element 8 and the second screening element 6,
advantageously, there is provided a fastening element 9, e.g., a
screw element, in combination with spacing elements.
[0043] As shown in FIG. 1, there is provided, between first
screening element 8 and the second screening element 6, an
insulation element 7 that thermally insulates both plate-shaped
screening elements 8 and 6 from each other. The spacer in the
fastening element 9 also serves for preventing the insulation
element 7 from being crushed or destroyed upon connection of the
first screening element 8 with the second screening element 6.
[0044] By forming a sandwich structure, bulging of the stripper 11
during operation because of different thermal loading of both sides
of the stripper 11, is prevented to a most possible extent.
Correspondingly, a stable and uniform striping with the stripper
tip 5 is insured.
[0045] In addition to the structure of the stripper 11 with a first
screening element 8 and a second screening element 6 and an
insulation element 7 arranged therebetween and which is shown in
FIG. 1, a construction of stripper 11 is contemplated, according to
the present invention, which has more than two screening elements,
e.g., three or four which likewise are separated from each other by
an insulation layer and are spaced from each other.
LIST OF REFERENCE NUMERALS
[0046] 1 Work roll [0047] 2 Back-up roll [0048] 3 Cooling
water-spraying apparatus [0049] 4 Bearing journal for positioning
of the stripper [0050] 5 Stripper tip [0051] 6 Second screening
element [0052] 7 Insulation element [0053] 8 First screening
element [0054] 9 Fastening element [0055] 10 Rolled material [0056]
11 Stripper [0057] 12 Pneumatic cylinder
* * * * *