Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Reexamination Certificate
2000-11-20
2002-07-30
Larson, Lowell A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
Reexamination Certificate
active
06425278
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a roll changing apparatus of a rolling mill.
2. Description of the Related Art
The outline of a conventional roll changing device in a 4-roll type rolling mill will be described with reference to FIG.
11
.
FIG. 11
shows a concept of a conventional roll changing device called a 3-roll cluster type. As shown in this figure, a work roll assembly
3
, composed of an upper work roll
1
and a lower work roll
2
equipped with chocks, is supported by upper and lower backup rolls
4
and
5
. The upper and lower backup rolls
4
and
5
, and the work roll assembly
3
are borne on a sled liner
6
, and the sled liner
6
is supported by a pair of rails
7
in such a manner as to be admissible into and removable from a work side relative to a rolling mill
8
. A floor surface of the rolling mill
8
is level with the position of the lower work roll
2
. In an underfloor portion on the work side of the rolling mill
8
, a space for moving the sled liner
6
and the lower backup roll
5
is formed in a ditch-like shape.
To change the upper work roll
1
and the lower work roll
2
, the upper backup roll
4
is detached or lifted, while the lower backup roll
5
and the work roll assembly
3
are being borne together on the sled liner
6
in the rolling mill
8
. Also, the sled liner
6
is pulled out onto the work side by driving means (not shown) for moving the sled liner
6
into and with respect to the rolling mill
8
. At the pulled out position, the work roll assembly
3
on the lower backup roll
5
is detached and removed by a crane or the like. An alternative new or repaired work roll assembly
3
is placed on the lower backup roll
5
, and the sled liner
6
is pulled into the rolling mill
8
.
In the 3-roll cluster type roll changing device, the width of the under floor ditch on the work side (i.e., the width in the plate passing direction) is nearly equal to the width of the rolling mill
8
. Thus, the work roll assembly
3
can be changed in a narrow space without the need to enlarge the space between the ditch and the rolling mill
8
. Each time the upper work roll
1
and the lower work roll
2
are to be changed, however, the lower backup roll
5
needs to be pulled out of the rolling mill
8
by the sled liner
6
. Furthermore, a crane or the like is used to change the work roll assembly
3
, thus requiring a long time for the roll change.
Under these circumstances, a roll changing device of a so-called turn table type as shown in FIG.
12
, or a roll changing device of a so-called side shift type as shown in
FIG. 13
has been used.
FIG. 12
shows the concept of the turn table type roll changing device, while
FIG. 13
shows the concept of the side shift type roll changing device. The members identical to the rolling mill
8
shown in
FIG. 11
are assigned the same reference numerals, and duplicate explanations are omitted.
As shown in
FIG. 12
, a moving frame
14
having a turn table
11
, mounted thereto and being movable in the direction of an arrow A, is provided on the work side of a rolling mill
8
. At positions on both sides of the center of rotation on the turn table
11
, retracting rails
12
,
13
for a work roll assembly
3
are provided in two parallel lines. The work roll assembly
3
can be carried from one of the retracting rails into the rolling mill
8
, or from the rolling mill
8
into the one retracting rail.
Changing of an upper work roll
1
and a lower work roll
2
by the turn table type roll changing device is performed in the following manner: The worn-out, old work roll assembly
3
is pulled out of the rolling mill
8
, and brought onto one of the retracting rails (rail
12
) on the turn table
11
that has stopped coaxially with the work roll assembly
3
. A new or repaired work roll assembly
3
a
is brought from the work side indicated by an arrow B onto the other retracting rail
13
. In this state, the turn table
11
is horizontally turned 180 degrees to interchange the positions of the retracting rails
12
and
13
. Then, the new or repaired work roll assembly
3
a
on the retracting rail
13
is drawn into the rolling mill
8
. Whereas the old work roll assembly
3
on the retracting rail
12
is taken out to the work side indicated by the arrow B. A lower backup roll
5
is changed by moving the moving frame
14
, which has the turn table
11
mounted thereto, in the direction of an arrow A to expose a retracting table (not shown) for changing of the lower backup roll
5
in a space between the rolling mill
8
and the moving frame
14
, and replacing the old lower backup roll
5
with a new lower backup roll
5
. With the turn table type roll changing device, the work rolls can be changed swiftly by operating the turn table
11
.
As shown in
FIG. 13
, the side shift type roll changing device has a plurality of (two in the illustrated example) side shift tables
16
and
17
provided on a work side of a rolling mill
8
in such a manner as to be movable parallel to the passing direction of a plate. Changing of an upper work roll
1
and a lower work roll
2
, according to the side shift type roll changing device, is performed in the following manner: One of the side shift tables, table
16
, is stopped at a position facing a work roll assembly
3
of the rolling mill
8
, and a worn-out, old work roll assembly
3
is retracted onto the side shift table
16
. On the side shift table
17
adjacent to the side shift table
16
, a new or repaired work roll assembly
3
a
has been placed. The side shift table
16
is freed from the position in front of the rolling mill
8
, and then the side shift table
17
is moved to the position in front of the rolling mill
8
and stopped there. In this state, the new or repaired work roll assembly
3
a
on the side shaft table
17
is drawn into the rolling mill
8
, while the old work roll assembly
3
on the side shift table
16
is taken out to the work side. Changing of a lower backup roll
5
is performed as follows: A ditch-like foundation is formed below a moving path for the side shift tables
16
and
17
. A table (not shown) for changing the lower backup roll
5
is provided in the ditch-like foundation. The side shift tables
16
,
17
are freed from the position facing the rolling mill
8
, and the lower backup roll
5
is changed. With the side shift type roll changing device, like the turn table type roll changing device, the work rolls can be changed swiftly by a moving operation of the side shift tables
16
,
17
.
According to the turn table type roll changing device, the work rolls can be changed swiftly by operating the turn table
11
. However, the turn table.
11
and the moving frame
14
are elaborate in configuration, and the foundation requires a special design, increasing the equipment cost. According to the side shift type roll changing device, the work rolls can be changed swiftly by a moving operation of the side shift tables
16
,
17
. However, there is need to consider a table shift space for retreat of the side shift tables
16
,
17
during changing of the backup roll. This also requires an elaborately configured device, increasing the equipment cost.
In addition, the turn table type roll changing device and the side shift type roll changing device enable the work rolls to be changed more swiftly compared with the three-roll cluster type roll changing device. Thus, it is demanded to modify the existing three-roll cluster type roll changing device into the turn table type or the side shift type. However, this requires that the foundation be upsized markedly, or an elaborate device be mounted. Thus, the modification of the existing three-roll cluster type roll changing device requires huge manpower, labor hours, and costs, and has not been easy.
SUMMARY OF THE INVENTION
The present invention has been accomplished in light of the foregoing situations. An object of the present invention is to provide a roll changing apparatus of a rolling mill capable of swiftly changing work roll
Aratani Hiroshi
Matsushima Hisao
Mito Yoshiki
Yamamoto Mikio
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