U.S. patent application number 11/921582 was filed with the patent office on 2009-05-21 for support roll for a rolling mill.
Invention is credited to Maik Berger, Achim Klein, Jorg Mockel, Heinz-Adolf Muller, Jochen Munker, Jorn Sohler.
Application Number | 20090126442 11/921582 |
Document ID | / |
Family ID | 37027839 |
Filed Date | 2009-05-21 |
United States Patent
Application |
20090126442 |
Kind Code |
A1 |
Mockel; Jorg ; et
al. |
May 21, 2009 |
Support Roll For A Rolling Mill
Abstract
Disclosed is a support roll (1) for a rolling mill, such as a
plate rolling mill, flat rolling mill, or similar, comprising a
jacket (2) and a roll shaft (3) which is embodied in several parts.
The invention also relates to a method for producing a support roll
(1).
Inventors: |
Mockel; Jorg; (Chemnitz,
DE) ; Klein; Achim; (Kreuztal, DE) ; Muller;
Heinz-Adolf; (Wilnsdorf, DE) ; Munker; Jochen;
(Kreuztal, DE) ; Sohler; Jorn; (Kreuztal, DE)
; Berger; Maik; (Chemnitz, DE) |
Correspondence
Address: |
FRIEDRICH KUEFFNER
317 MADISON AVENUE, SUITE 910
NEW YORK
NY
10017
US
|
Family ID: |
37027839 |
Appl. No.: |
11/921582 |
Filed: |
July 5, 2006 |
PCT Filed: |
July 5, 2006 |
PCT NO: |
PCT/EP2006/006557 |
371 Date: |
December 5, 2007 |
Current U.S.
Class: |
72/243.6 ;
72/241.4 |
Current CPC
Class: |
B21B 13/14 20130101;
B21B 27/03 20130101; F16C 13/00 20130101; B21B 27/032 20130101;
F16C 2322/12 20130101; Y10T 29/49547 20150115 |
Class at
Publication: |
72/243.6 ;
72/241.4 |
International
Class: |
B21B 29/00 20060101
B21B029/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 7, 2005 |
DE |
10 2005 032 126.7 |
Jan 20, 2006 |
DE |
10 2006 002 773.6 |
Claims
1. Support roll (1) for a rolling mill, such as a plate rolling
mill, sheet rolling mill or the like, which consists of a shell (2)
and a roll shaft/roll spindle (3), wherein the roll shaft/roll
spindle (3) is constructed from a left half-journal (4) and a right
half-journal (5).
2. Support roll (1) in accordance with claim 1, wherein the roll
shaft/roll spindle (3) is constructed from a left half-journal (4)
and a right half-journal (5) with at least one bushing arranged
between them.
3. Support roll (1) in accordance with claim 2, wherein one of the
journals (4, 5) is formed with at least one through bore (11)
parallel to the axis.
4. Support roll (1) in accordance with claim 2, wherein one of the
journals (4, 5) is formed with a threaded bore (10).
5. Support roll (1) in accordance with claim 1, wherein the
interior of the shell (2) is cylindrically formed.
6. Support roll (1) in accordance with claim 1, wherein the
interior of the shell (2) is formed as a conical frustum.
7. Support roll (1) in accordance with claim 1, wherein the shell
(2) is made of a high-grade, cast and/or forged steel that has been
quenched and tempered.
8. Support roll (1) in accordance with claim 1, wherein the shell
(2) is formed with a wear-resistant buildup weld on its outer
circumferential surface.
9. Support roll (1) in accordance with claim 1, wherein the shell
(2) is formed with several barrel or shrink rings (16) on its outer
circumferential surface.
10. Support roll (1) in accordance with claim 1, wherein one end of
the shell (2) is formed with a journal (12).
11. Method for producing a support roll (1), especially a support
roll (1) in accordance with claim 1, wherein the shell (1) is
internally heated, a right journal (5) and a left journal (4) are
inserted in the shell (1), and the shell (1) is then cooled.
12. Method in accordance with claim 11, wherein the right journal
(5) and the left journal (4) are pretensioned with respect to each
other by at least one tie rod, pretensioning bolt or the like.
13. Method in accordance with claim 11, wherein the tie rod,
pretensioning bolt or the like is screwed into a threaded bore
(10), which is formed in one of the two journals (4, 5).
14. Method in accordance with claim 11, wherein at least one
bushing is mounted inside the shell (2) between the journals (4,
5).
15. Method in accordance with claim 11, wherein the outer surface
of the shell (2) is provided with a wear-resistant buildup
weld.
16. Method in accordance with claim 11, wherein a stop edge (8, 9)
of each journal (4, 5) is positioned against the end face (6, 7) of
the shell (2).
Description
[0001] The invention concerns a support roll for a rolling mill,
such as a plate rolling mill, sheet rolling mill or the like, which
consists of a shell and a roll shaft/roll spindle, and a method for
producing a support roll of this type.
[0002] Previously known support rolls for multiple-high rolling
stands for hot rolling or cold rolling on a flat track are produced
as a single part. To produce support rolls that weigh more than 120
t, which are used especially in plate rolling stands, two possible
means of production are known:
[0003] (a) The support roll is cast and then forged in an open-die
forge and then worked.--single-component roll--
[0004] (b) The support roll is cast by composite casting techniques
and consists of hard, wear-resistant material in the barrel region
and of high-grade tough material with high bending fatigue strength
in the neck and core regions. This is followed by mechanical
working.--multiple-component roll--
[0005] There are only a few manufacturers of single-part support
rolls that weigh more than 170 t, and this means long delivery
times and high prices.
[0006] Support rolls of this type have the further disadvantage of
high shipping costs due to the large weights.
[0007] Furthermore, the entire roll body must be scrapped when the
useful barrel region (constructed to be wear-resistant) becomes
worn.
[0008] Besides the single-part support rolls, multipart support
rolls are also known.
[0009] EP 1 056 553 B1 describes a rolling mill with work rolls and
multipart support rolls that consist of a main roll body with
several roller bearings installed on it side by side in its
longitudinal direction, whose outer rings support a rotatable shell
that encompasses the roller bearings. The inner surface of the
shell rests with full contact on the outer surfaces of the outer
rings of the roller bearings. The outer surface forms the roll
barrel of the support roll, and three roller bearings are provided
on the length of the main roll body, of which the middle roller
bearing is designed as a conical roller bearing. The two outer
roller bearings are designed as cylindrical roller bearings, and an
eccentric bushing that can be rotated by a motor about the
longitudinal axis of the main roll body is installed between each
of the two cylindrical roller bearings and the main roll body, such
that a self-adjustable tilting segment that allows skewing of the
cylindrical roller bearing is provided in the load region of the
main roll body between the main roll body and each eccentric
bushing.
[0010] German Early Disclosure 1 602 121 describes a multipart
support roll for four-high rolling stands for rolling out flat
metal products, in which the rolling forces to be absorbed by the
support roll are transmitted from the cylindrical surface of the
support roll to the spindle or shaft in only two places within the
width range of the roll barrel.
[0011] EP 0 896 841 A2 discloses a rolling mill with work rolls and
multipart support rolls that consist of a main roll body with
several roller bearings installed on it side by side in its
longitudinal direction, whose outer rings support a rotatable shell
that encompasses the roller bearings. The outer surface forms the
roll barrel of the support roll, where the main roll body can
rotate about its longitudinal axis and is divided into cylindrical
sections that have approximately the same width as the roller
bearings. The parallel axes of these adjacent cylindrical sections
are offset relative to each other. The inner surface of the shell
rests with full contact on the outer surfaces of the outer rings of
the roller bearings and in this way is provided with an
eccentricity that results from the eccentricity of the sections of
the main roll body, reduced by the opposing bending effect of the
shell.
[0012] An arrangement of this type is also described in EP 1 058
616 B1.
[0013] DE 197 02 325 A1 discloses a method for producing
vibration-damped rolls. In this method, to change the values of the
natural frequencies of at least one roll, at least one cavity that
is parallel to the axis is formed in at least one support roll
and/or an associated work roll. In a set of rolls of the invention,
which consists of at least a work roll and support roll, at least
one roll is provided with at least one cavity that is parallel to
the axis.
[0014] EP 0 937 515 B1 discloses a roll that consists of a rotating
roll jacket and means, which are installed inside the roll jacket,
for controlling the flexural rigidity of the roll jacket. The
control means consist of a sliding bearing in the form of a
rotatable body, which can be rotatably adjusted and is shaped in
such a way that its load-bearing surface corresponding to the
loaded zone of the roll jacket is part of the cylindrical outer
surface of a rotationally symmetric body, and the boundary of this
cylindrical outer surface is formed in such a way that the width
and/or position of the load-bearing surface varies along the
circumference of the rotatable body. In the region of its
load-bearing surface, the rotatable body has at least one recess.
The course of the boundary of this recess and its inner contour can
be shaped in any desired way.
[0015] These previously known multipart embodiments or designs of
support rolls are constructed as shell rolls, i.e., an outer sleeve
or the like rotates about an inner shaft, spindle or the like.
[0016] Support rolls with a large total weight that are produced by
these previously known methods have the same disadvantages with
respect to shipping, etc., as a single-part support roll.
[0017] Therefore, the objective of the invention is to simplify
production of the known support rolls, shorten the delivery time,
increase the service life, and reduce the aforementioned
disadvantages, such as high shipping costs.
[0018] In accordance with the invention, the solution to this
problem is characterized by the fact that, in a support roll for a
rolling mill, such as a plate rolling mill, sheet rolling mill or
the like, which consists of a shell and a roll shaft/roll spindle,
the roll shaft/roll spindle is constructed from multiple parts.
[0019] Additional embodiments of the support roll are revealed in
the pertinent dependent claims.
[0020] In a further development of the invention, one or more bores
are provided in the half-journals. The half-journals run parallel
to the axis and are, for example, symmetrically arranged. If only
one bore is provided, the axis of the bore is identical with the
longitudinal axis of the half-journal. In a first embodiment, both
half-journals are formed with through bores, into which a tension
bar/tie rod is inserted to pretension the two half-journals with
respect to each other.
[0021] In another embodiment, one half-journal is provided with
through bores, and the other half-journal is provided with threaded
bores, into which threaded rods/pretensioning bolts are turned.
[0022] In a first embodiment, the half-journals are cylindrically
shaped in the region that is surrounded by the shell. In another
embodiment, this region is designed in the form of a conical
frustum. In this regard, for example, a conical seat is provided,
which has a small conical angle and a self-locking design. In
another embodiment, a bushing is provided between the two
half-journals. This bushing makes it possible to produce support
rolls of different lengths with the same half-journals. The
different lengths of the shells are bridged by one or more adapted
bushings.
[0023] For further simplification, a bushing can be designed with
the threaded bore or threaded bores. The half-journals are then
designed only with through bores.
[0024] The invention also concerns a method for producing a support
roll that consists of a shell and a multipart roll shaft/roll
spindle.
[0025] In accordance with the production method of the invention,
the shell is internally heated and thus expands. The half-journals
are then inserted into the shell and pushed up against the right
and left end walls of the shell. To achieve exact positioning, the
half-journals have, for example, at least one locating edge on
their circumference. The support roll, which consists of the shell,
right half-journal, and left half-journal, is held together by a
shrink fit after the shell has been cooled. A support roll of high
flexural rigidity is obtained.
[0026] Additional embodiments of the method are revealed in the
pertinent dependent claims.
[0027] When the shell has reached an established wear limit, the
two half-journals and, if necessary, the pretensioning bolt or
bolts are removed from the shell. Due to the construction of the
support roll in accordance with the invention, the right
half-journal, the left half-journal, and the pretensioning bolt or
bolts can be reused.
[0028] Due to the embodiments of the support roll in accordance
with the invention with a shell, right half-journal, left
half-journal, and pretensioning bolt or bolts, etc., there is the
further advantage that these individual parts can be shipped
separately to the installation site, a rolling mill or the like.
The support roll is then put together/assembled on site.
[0029] Specific embodiments of the invention will now be explained
in greater detail with reference to the highly schematic
drawings.
[0030] FIG. 1 shows a perspective sectional view of a multipart
support roll.
[0031] FIG. 2 shows a perspective sectional view of a support roll
of the invention, in which the shell is designed with a
journal.
[0032] FIG. 3 shows a perspective sectional view of a support roll
of the invention with barrel or shrink rings.
[0033] FIG. 4 shows a perspective sectional view of a support roll
with a cavity.
[0034] FIG. 5 shows a perspective sectional view of a two-part
embodiment.
[0035] FIG. 6 shows a sectional front view of a variant of a
support roll according to FIG. 4.
[0036] FIG. 1 shows a perspective sectional view of a support roll
1. The support roll 1 consists of a shell 2 and a roll shaft/roll
spindle 3. In accordance with the invention, the roll shaft/roll
spindle 3 is formed by a left journal 4 and a right journal 5.
Holding fixtures for bearings are formed at the outer ends.
[0037] The inside of the shell 2 is designed in the form of a
conical frustum, starting at each of the end faces 6, 7. To achieve
better positioning of the journals 4, 5 in the shell 2, the
journals 4, 5 are provided with a stop edge 8, 9.
[0038] In the illustrated embodiment, the left journal 4 has a
threaded bore 10, while the right journal 5 is provided with a
through bore 11, through which a pretensioning bolt (not shown) is
passed.
[0039] Another embodiment is shown in FIG. 2. The left journal 4 is
designed in such a way that it is installed in the shell 2 over a
great length. The shell 2 is formed at its right end, for example,
with a journal 12, which is cast on or forged on at one end. The
left journal 4 and the shell 2 are joined by means of combined
conical shrink fit 14 and/or cylindrical shrink fit 15. This
three-part support roll is held together by a pretensioning bolt
13. The left journal 4 directly receives a journal bearing (not
shown).
[0040] The advantage of this design is that due to the long joint
of the parts with each other (left journal 4 in the shell 2), the
deflection curve bending lines of the two parts are compensated,
and thus the stresses and deformations are within permissible
limits.
[0041] To avoid having to make a complete exchange of a damaged or
worn shell 2, barrel or shrink rings 16 are shrink-fitted over the
entire length of the barrel, as shown in FIG. 3. In this regard,
several equally wide or variably wide barrel or shrink rings 16 are
shrink-fitted onto graduated cylindrical diameters of the shell 2.
An advantage of this is the possibility of shrink-fitting new
barrel or shrink rings 16 when these have reached the end of their
usable diameter after repeated regrinding. The shell 2 can be used
again.
[0042] In FIG. 4, the support roll 1 consists of the shell 2 and
the journals 4, 5, which are inserted only a short distance into
the shell 2. This results in the formation of a cavity 17 in the
shell 2. The journals 4, 5 are, for example, pressed in by means of
an easy cylindrical or conical fit in the shell 2. To secure the
connection, the journals 4, 5 are bolted with the shell at both
ends by a sufficient number of bolts 18. The advantage of this
embodiment is the possibility of reusing the left journal 4 and the
right journal 5 when the outside diameter of the shell has been
ground down to the point that it has reached the end of its
predetermined usable diameter. The equipment for changing the
support roll 1 can be designed with smaller dimensions, because the
whole support roll 1 is lighter than a solid roll.
[0043] As illustrated in FIG. 5, a multipart roll shaft/roll
spindle 3 in a support roll 1 is realized by forming the left
journal 4 as a single part with the shell 2. The right journal 5
has a stop face 19 to allow proper positioning of the two parts.
The two parts are joined after the cylindrical shell has first been
heated. After insertion of the journal 5, followed by cooling, a
strong joint is present in the form of a transverse press fit. Due
to the action of friction, sufficient fixation of the axial
position is guaranteed. The connection is additionally secured, as
described above, by means of a pretensioning bolt or several
pretensioning bolts. The use of a pretensioning bolt or bolts is
helpful during the assembly of the support roll.
[0044] FIG. 6 shows a possible variant of the embodiment of a
support roll shown in FIG. 4. The shell 2 consists of a cast hollow
body or a hollow body that is forged over a mandrel. The ends of
the shell are already formed as a single part with regions for
holding bearings. The actual journals of the roll shaft/roll
spindle 3 (not shown) are again secured by means of bolts and/or a
joint seat. The advantage of this embodiment is that the weight of
the support roll is reduced.
LIST OF REFERENCE NUMBERS
[0045] 1 support roll [0046] 2 shell [0047] 3 roll shaft/roll
spindle [0048] 4 left half-journal [0049] 5 right half-journal
[0050] 6 end face [0051] 7 end face [0052] 8 stop edge [0053] 9
stop edge [0054] 10 threaded bore [0055] 11 through bore [0056] 12
journal [0057] 13 pretensioning bolt [0058] 14 conical shrink fit
[0059] 15 cylindrical shrink fit [0060] 16 barrel or shrink rings
[0061] 17 cavity [0062] 18 bolts [0063] 19 stop face
* * * * *