Title of lnvcntion
WATER REMOVING APPARATUS AND WATER REMOVING MErHOD FOR
5 STEEL SHEET COOLING WATER TN I-IOT ROLLING PROCESS
Technical Field
[OOOl]
The present invention relates to a water removing apparatus and a water
10 removing method that remove cooling water that has been jetted to the hot rolling
steel sheet when cooling a hot rolling steel sheet bcfore and after rough rolling or
before and after finish rolling of a hot rolling process, and relates particularly to a
water removing apparatus and a water removing method that remove a large amount
of cooling water.
15
Background Art
[OOO2]
A hot rolling steel sheet after finish rolling of a hot rolling process is cooled
to a prescribed temperature by a cooling apparatus provided above and below the
20 run-out table while being conveyed by a run-out table from the finish rolling mill to a
winding apparatus, and is then wound around the winding apparatus. In the hot
rolling of the hot rolling steel sheet, the condition of the cooling after finish rolling is
an important factor in determining the mechanical properties, formability,
weldability, etc. of the hot rolling steel sheet, and it is important to uniformly cool
25 the hot rolling steel sheet to a prescribed temperature.
[0003]
In the cooling process afier finish rolling, the hot rolling steel sheet is
usually cooled using, for example, water (hereinafter, referred to as cooling water) as
a cooling medium. Specifically, the hot rolling steel shcct is cooled using cooling
30 water in a prescribed cooling area of the hot rolling steel sheet. In order to
uniformly cool the hot rolling steel sheet to a prcscribed temperature as described
above, it is necessary to prcvcnt a situation in which surplus cooling watcr llows out
to an area other than the cooling area and consequently the hot rolling steel shcet is
cooled in the area other than the cooling area.
[0004]
5 Hence, the removal of cooling water on the hot rolling steel sheet is
performcd. Thus hr, various methods have been proposed as the water removing
method for the cooling water.
[0005]
Patent Literature 1 discloses a method in which water removing nozzles are
10 placed on both sides in the width direction of a steel sheet, water-removing water is
jetted by cach water removing nozzle to the upper surface of the steel sheet over the
entire width, anc! thereby the removal of the cooling water is performed.
[0006]
Patent Literature 2 discloses a method in which a plurality of water
15 removing nozzles are aligned in the conveyance direction of a steel sheet on one side
in the width direction of the steel sheet, water-removing water is jetted by each water
removing nozzle to the upper surface of the steel sheet over the entire width, and
thereby the removal of the cooling water is performed.
[0007]
20 Patent Literature 3 discloses a method in which a plurality of water
removing nozzles a1.e aligned in the width direction of a steel sheet above the steel
sheet, water-removing water is jetted by the plurality of water removing nozzles so as
to oppose the flow on the steel sheet, and thereby the removal of the cooling water is
performed.
25
Citation List
Patent Literature
[OOOS]
Patent Literature 1 :
Patent 1,iterature 2:
Patent Literature 3:
Summary of Invcntion
Technical Problem
[0009]
5 However, in the case where the method described in Patent Literature 1 is
used, the water removing nozzle jets water-removing water to the upper surface of
the steel sheet over thc entire width; hence, the collision strength of water-removing
water varies in the width direction of the steel sheet, and water removal efficiency is
poor. That is, on the side far from the side where the water removing nozzle is
10 installed (the opposite side to the side where the water removing nozzle is installed),
the collision strength of water-removing water is weak, and water leakage occurs.
Consequently, a large amount of water-removing water is needed. In particular,
from the recent demand to improve the material quality of steel sheets, the steel sheet
is required to be cooled with cooling water with a large water flow density of, for
15 example, 1.0 n~~im~lmor imno re; but when removing such a large amount of cooling
water, a still larger amount of water-removing water is needed.
[001 01
Further, in the case where the method described in Patent Literature 2 is
used, the water removing nozzle jets water-removing water from one side of the steel
20 sheet to the upper surface of the steel sheet over the entire width; hence, the collision
strength of water-removing water varies in the width direction of the stccl sheet, and
water removal efficiency is poor. That is, on the side far from the side where the
water removing nozzle is installed (the opposite side to the side where the water
removing nozzle is installed), the collision strength of water-removing water is weak,
25 and water leakage occurs. Consequently, a large amount of water-removing water
is needed.
[OOll]
Further, in the case where the method described in Patent Literature 3 is
used, a space for installing the water removing nozzle is needed above the steel sheet.
30 Hence, in the space for installing the water removing nozzle, for example, a cooling
water nozzle that jets cooling watcr cannot be installed, and the cooling of the steel
shcct cannot bc pcrformcd; consequcntly, the cooling performance on the steel sliect
is reduced. In addition, it is diflicult to newly install a water removing no~zle.
LOO1 21
The present invention has been made in view of such circlunstanccs, and an
5 object of the present invention is to remove the cooling water appropriately with
good efficiency when cooling a hot rolling steel sheet before and after rough rolling
or before and after finish rolling of a hot rolling process with cooling water.
Solution to Problem
10 [O013]
To achieve the above described object, the present invention is characterized
by a water removing apparatus for steel sheet cooling water in a hot rolling process
that removes cooling water jetted to the hot rolling steel sheet when cooling a hot
rolling steel sheet before and after rough rolling or before and after finish rolling of a
15 hot rolling process, the water removing apparatus comprising: a plurality of water
removing nozzles that are aligned in a conveyance direction of the hot rolling steel
sheet on one side or both sides in a width direction of a steel sheet conveyance plane
and jet water-removing water to the steel sheet conveyance plane. A water removal
single area that is an area of collision of water-removing water jetted from one of the
20 water removing nozzles in the steel sheet conveyance plane has a prescribed width
less than a width oS the steel sheet conveyance plane, and the pluralily of water
removing nozzles are arranged so as to cover the entire area in the width direction of
the steel sheet conveyance plane with ihe plurality of water removal single areas.
One or more water removing nozzles that are placed on a lateral side of one end in
25 the width direction of the steel sheet conveyance plane among the plurality of water
removing nozzles comprise one or more of a single far water removing nozzle and a
far water removing nozzle group. The single far water removing nozzle forms a far
end water removal single area that does not include the one end but includes another
end in the width direction of the steel sheet conveyance plane. The far water
30 removing nozzle group comprises one or more inner water removing nozzles and the
far water removing nozzle, and one or more inner water removal single areas, which
the one or more inner water removing nozzles form and which do not include either
end in the width direction of the steel sheet conveyance plane, and the far end water
removal single area which the far water removing nozzle forms, are formed. The
one or Inore inner water removal single areas and the far water removing,nozzle are
5 aligned in order from the one end side to the other end side while overlapping with
each other in the width direction of the steel sheet conveyance plane and aligned in
order from an upstream side to a downstream side without overlapping in the
conveyance direction. The steel sheet conveyance plane in the present invention is
the pass line of the hot rolling steel sheet.
10 [0014]
According to the present invention, by the far end water removal single area
from the far water removing nozzle on the one end side in the width direction of the
steel sheet conveyance plane, the cooling water is pushed out to the other end side.
As a result, the cooling water on the hot rolling steel sheet is discharged from the
15 lateral side appropriately.
[00 151
Further, in the far water removing nozzle group, the jet flow of waterremoving
water from the inner water removing nozzle on the upstream side mainly
has the function of intercepting cooling water, and the jet flow of water-removing
20 water from the far water removing nozzle on the downstream side of the inner water
removing nozzle mainly has the function of pushing out cooling water. That is, the
cooling water is intercepted by the jet flow from the inner water removing nozzle, in
other words, by a wall of water-removing water. At this time, the speed of the
cooling water in the inner water removal single area becomes slower, and
25 accordingly the height of the cooling water becomes higher. Further, the cooling
water is pushed out to the other end side by the jet flow from the far water removing
nozzle. At this time, the speed of the cooling water in the far end water removal
single area becomes faster than the speed of the cooling water in the inner water
removal single area mentioned above, and the height of the cooling water becomes
30 lower. Therefore, even when the height of the jet flow of water-removing water
from the far water removing nozzle is low, the cooling water is discharged from the
other end side appropriately.
[0016]
Here, in the case where, as in the past, the cooling water is removed by one
water removing nozzle over the entire width of the hot rolling steel sheet, the water
5 removing nozzle needs to have both of the function of intercepting cooling water and
the function of pushing out cooling water described above. To achieve the function
of intercepting cooling water, it is necessary to form a wall of water-removing water
so as to intercept cooling water with a high height, and a large water flow density is
needed. On the other hand, to achieve the function of pushing out cooling water, it
10 is sufficient that a speed in the width direction of the steel sheet conveyance plane be
given to cooling water with a low height, and only a small water flow density is
needed. If one water removing nozzle achieves both functions, a large amount of
water-removing water is needed.
[00 171
15 In contrast, in the present invention, the functions of the plurality of water
removing nozzles are separated as described above, and thereby the amount of waterremoving
water jetted from each water removing nozzle can be reduced. Therefore,
the water removal eficiency of cooling water can be improved, and energy
efficiency can be improved.
20 1001 81
Furthermore, the plurality of water removal single areas from Lhe plurality
of water removing nozzles cover the entire area in the width direction of the steel
sheet conveyance plane. Therefore, the cooling water can be removed appropriately
by the water removing apparatus.
25 [0019]
Moreover, the plurality of water removing nozzles are placed on the lateral
side in the width direction of the steel sheet conveyance plane, and the installation
space is small. Therefore, the installation flexibility of the water removing
apparatus is high, and the placement of the cooling apparatus is not influenced by the
30 water removing apparatus. Therefore, the cooling performanec on the hot rolling
stecl sheet can be ensured appropriately.
(00201
Thus, according to the present invention thc cooling water can be removed
appropriately with good efficiency when cooling a hot rolling steel sheet before and
alter rough rolling or before and after finish rolling of a hot rolling process with
5 cooling water.
[002 1 J
In the water removing apparatus, one or more of the single far water
removing nozzle(s) or one or more of the far water removing nozzle group(s) may he
placed on both sides in the width direction of the steel sheet conveyance plane.
10 [0022]
In the water removing apparatus, in addition to the single far water
removing nozzle or the far water removing nozzle group, a near water removing
nozzle may be placed on the lateral side of the one end in the width direction of the
steel sheet conveyance plane. The near water removing nozzle may form a near end
15 water removal single area, which is not included in either a far end water removal
single area that the single far water removing nozzle forms or a far water removal
area group that the far water removing nozzle group forms and which includes the
one end in the width direction of the steel sheet conveyance plane on the upstream
side in the conveyance direction of the far end water removal single area or the far
20 water removal area group. Water removal may be continuously performed by at
least the single far water removing nozzle or the far water removing nozzle group
and the near water removing nozzle from the one end to the other end in the width
direction of the steel sheet conveyance plane.
100231
25 In the water removing apparatus, a water removing nozzle, which is placed
in the downstream side at a second or a subsequent position from the upstream side
in the conveyance direction among the plurality of water removing nozzles, forms
the water removal single area in a manner that, in a planar view, a far side of a long
I axis of the water rcmoval single area is inclined from the width direction toward the
30 downstream side ill the conveyance direction.
[0024]
Anothcr aspcct ol the present illvention is characterized by a water
removing method for stecl sheet cooling water in a hot rolling process by which
cooling water jetted to the hot rolling steel shcct arc removed when cooling a hot
rolling steel sheet before and after rough rolling or before and after finish rolling of a
5 hot rolling process, the water removing method comprising: removing cooling water
by jetting water-removing water to the hot rolling steel sheet with a plurality of water
removing nozzles that are aligned in a conveyance direction of the hot rolling steel
sheet on one side or both sides in a width direction of the hot rolling steel sheet. A
water removal single area that is an area of collision of water-removing water jetted
10 from one of the water removing nozzles on the hot rolling steel sheet has a prescribed
width less than a width of the hot rolling steel sheet, and the plurality of water
removal single areas formed by the plurality of water removing nozzles cover the
entire area in the width direction of the hot rolling steel sheet. One or more water
removing nozzles that are placed on a lateral side of one end in the width direction of
15 the hot rolling steel sheet among the plurality of water removing nozzles comprise
one or more of a single far water removing nozzle and a far water removing nozzle
group. The single far water removing nozzle forms a far end water removal single
area that does not include the one end but includes another end in the width direction
of the hot rolling steel sheet. The far water removing nozzle group comprises one
20 or more inner water removing nozzles and the far water removing nozzle, and one or
more inner water removal single areas, which the one or more inner watcr removing
nozzles form and which do not include either end in the width direction of the hot
rolling steel sheet, and the far end water removal single area, which the far water
removing nozzle forms, are formed. The one or more inner water removal single
25 areas and the far water removing nozzle are aligned in order from the one end side
to the other end side while overlapping with each other in the width direction of the
hot rolling steel sheet and at aligned in order from an upstream side to a downstream
side without overlapping in the conveyance direction.
[0025]
30 In the water removing method, one or more of the single far water removing
nozzle(s) or one or more of far water removing nozzle group(s) may be placed on
both sides in the width direction of the hot rolling steel sheet.
[0026]
In the water removing method, in addition to the single far water removing
nozzle or the far water renloving nozzle group, a near water removing nozzle may be
5 placed on the lateral side of the one end in the width direction of the hot rolling steel
sheet. The near water removing nozzle may form a near end water removal single
area, which is not included in either a far end water removal single area that the
single far water removing nozzle forms or a far water removal area group that the far
water removing nozzle group forms and which includes the one end in the width
10 direction of the hot rolling steel sheet on the upstream side in the conveyance
direction of the far end water removal single area or the far water removal area group.
Water removal may be continuously performed by at least the single far water
removing nozzle or the far water removing nozzle group and the near water
removing nozzle from the one end to the other end in the width direction of the hot
15 rolling steel sheet.
[0027]
In the water removing method, a water removing nozzle, which is placed in
the downstream side at a second or a subsequent position from the upstream side in
the conveyance direction among the plurality of water removing nozzles, may form
20 the water removal single area in a manner that, in a planar view, a far side of a long
axis of the water re~novals ingle area is inclined from the width direction toward the
downstream side in the conveyance direction.
Advantageous Effects of Invention
25 [0028]
According to the present invention, the cooling water can he removed
appropriately with good efficiency when cooling a hot rolling steel sheet before and
after rough rolling or before and after finish rolling of a hot the rolling process with
cooling water.
Brief Descriptioil of Drawings
100291
[FIG. 11 FIG. 1 is an illustration diagram showing an overview of the configuration ol'
a hot rolling facility i~lcludinga watcr removing apparatus In an embodinlent oS the
present invention.
5 [FIG. 21 FIG. 2 is a side view showing an ovcrview of the configuratioils of a cooling
apparatus and the water removing apparatus.
[FIG. 31 FIG. 3 is a side view showing an overview of the configuration of the water
removing apparatus.
[FIG. 41 FIG. 4 is a plain view showing an overview of the configuration of the water
10 removing apparatus.
[FIG. 51 FIG. 5 is an illustration diagram of a case where a sixth condition (described
later) is not satisfied.
[FIG. 61 FIG. 6 is a side view showing an overview of the configuration of a water
removing apparatus in another embodiment.
15 [FIG. 71 FIG. 7 is a plain view showing an overview of the configuration of the water
removing apparatus in the other emhodiment.
[FIG. 81 FIG. 8 is an illustration diagram showing an example in which the removal
of cooling water is not performed appropriately.
[FIG. 91 FIG 9 is an illustration diagram showing an example in which the removal
20 of cooling water is not performed appropriately.
[FIG. 101 FIG. 10 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
[FIG. 111 FIG. 11 is a plain view showing an overview of the configuration of a water
removing apparatus in another embodiment.
25 [FIG. 121 FIG. 12 is a side view showing an overview of the configuration of a water
removing apparatus in another embodiment.
[FIG. 131 FIG. 13 is a plain view showing the overview of the configuration of the
water removing apparatus in the other embodiment.
[FIG. 141 FIG. 14 is a side view showing an overview of the configuration of a water
30 removing apparatus in another embodiment.
[FIG. 151 FIG. 15 is a plain view showing t!le overview of the configuration of the
water removing apparalus in the other cmbodiment.
[FIG. 161 FIG. 16 is a plain view showing an overview ofthe configuration of a water
removing apparatus in another embodiment.
[FIG. 171 FIG. 17 is a plain view showing an overview of the configuration of a water
5 removing apparatus in another embodiment.
[FIG. 181 FIG. 18 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
[FIG. 191 FIG. 19 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
10 [FIG. 201 FIG. 20 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
[FIG. 211 FIG. 21 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
[FIG. 221 FIG. 22 is an illustration diagram showing an example in which the
15 removal of cooling water is not performed appropriately.
[FIG. 231 FIG. 23 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
[FIG. 241 FIG. 24 is an illustration diagram showing an example in which the
removal of cooling water is not performed appropriately.
20
Description of Embodiments
[0030]
4 . Hot rolling facility>
Hereinbelow, embodiments of the present invention are described. FIG. 1
25 is an illustration diagram showing an overview of the configuration of a hot rolling
facility 1 comprising a cooling apparatus in an embodiment.
[003 11
In the hot rolling facility 1, a heated slab 5 is continuously rolled by being
vertically sandwiched between rolls and is thereby thinned to the minimum sheet
30 thickness of 1 mm, and a hot rolling stecl sheet 10 is wound. The hot rolling
facility 1 comprises a heating furnace 11 for heating the slab 5, a width-direction
rolling mill 12 that rolls the slab 5 that has been heated in the heating furnace 11 in
the width dircction, a rough rolling mill 13 that rolls the slab 5 that has bcen rolled in
the width dircction while vertically sandwiching the slab 5 to inakc a rough bar, a
finish rolling mill 14 that further performs finish hot rolling continuously on the
5 rough bar to a prescribed thickness, a cooling apparatus 15 that uses cooling water to
cool the hot rolling steel sheet 10 which has been subjected to finish hot rolling by
the finish rolling mill 14, a water removing apparatus 16 that removes the cooling
water jetted from the cooling apparatus 15, and a winding apparatus 17 that winds
the hot rolling steel sheet 10 that has been cooled by the cooling apparatus 15 into a
10 coil form. The above is a general configuration, and the configuration is not limited
thereto.
[0032]
In the heating furnace 11, the treatment of heating the slab 5, which is
carricd in from the outside via an inlet to a prescribed temperature, is performed.
15 When the heating treatment in the heating furnace 11 is finished, the slab 5 is
conveyed to the outside of the heating furnace 11, and is then subjected to a rolling
process by the rough rolling mill 13.
100331
The conveyed slab 5 is rolled by the rough rolling mill 13 to a sheet
20 thickness of approximately 30 to 60 mm, and is conveyed to the finish rolling mill 14.
[0034]
In the finish rolling mill 14, the conveyed hot rolling steel sheet 10 is rolled
to a sheet thickness of approximately several millimeters. The rolled hot rolling
steel sheet 10 is conveyed by conveyor rolls 18, and is transferred to the cooling
25 apparatus 15.
100351
The hot rolling steel sheet 10 is cooled by the cooling apparatus 15, and is
wound in a coil form by the winding apparatus 17. The configurations of the
cooling apparatus 15 and the water removing apparatus 16 are described below in
30 detail.
[0036]
<2. Cooling apparatus>
Ncxt, the configuration of the cooling apparatus 15 mentioned above is
described. The cooling apparatus 15 comprises, as shown in FIG. 2, an upper
cooling apparatus 15a placed above the hot rolling steel sheet 10 that is conveyed on
5 the conveyor rolls 18 of a run-out table and a lower cooling apparatus 15b placed
below the hot rolling steel sheet 10.
100371
The upper cooling apparatus 15a comprises a plurality of cooling water
nozzles 20 that jet cooling water from above ihe hot rolling steel sheet 10 toward the
10 upper surface of the hot rolling steel sheet 10 vertically downward. As the cooling
water nozzle 20, for example, a slit laminar nozzle or a pipe laminar nozzle is used.
The plurality of cooling water nozzles 20 are aligned in the conveyance direction of
the hot rolling steel sheet 10 (the Y-direction in the drawing). In the embodiment,
the cooling water nozzle 20 jets cooling water to the hot rolling steel sheet 10 with a
15 large water flow density of 1.0 to 10 m3/m2/min, and thereby cools the hot rolling
steel sheet 10 to a prescribed temperature. As ihe cooling water nozzle 20, other
nozzles may be used.
[003 81
The lower cooling apparatus 15b comprises a plurality of cooling water
20 nozzles 21 that jet cooling water from below the hot rolling steel sheet 10 toward the
lower surface of the hot rolling steel sheet 10 vertically upward. As ihe cooling
water nozzle 21, for example, a pipe laminar nozzle is used. A plurality of cooling
water nozzles 21 are aligned in the conveyance direction of the hot rolling steel sheet
10 (the Y-direction in the drawing). In addition, a plurality of cooling water nozzles
25 21 are aligned in the width direction of the hot rolling steel sheet 10 (the X-direction
in the drawing) between a pair of conveyor rolls 18 and 18 adjacent in the
conveyance direction of the hot rolling steel sheet 10.
[0039]
<3. Water removing apparatus>
30 Next, the configuration of the water removing apparatus 16 mentioned
above is described. The water removing apparatus 16 comprises, as shown in FIG.
2 lo FIG. 4, Lwo water removing nozzles 30 and 31 that jet water-removing water to
the upper surface of the hot rolling steel sheet 10. The water removing nozzles 30
and 3 1 are placed on the lateral side of one end Ha in the width direction (the end on
the positive X-direction side in the drawing) of the pass line of the hot rolling steel
5 sheet 10 (hereinafter, refelxed to as a steel sheet conveyance plane). The steel sheet
conveyance plane is on a line connecting the apices of the conveyor rolls 18 in the
side view, and is a conveyance plane in the case where, in the planar view, the
dimension in the width direction of the hot rolling steel sheet 10 is the maximum
producible dimension. Therefore, the water removing nozzles 30 and 3 1 are always
10 placed on the lateral side of the one end Ha in the width direction of the hot rolling
steel sheet 10, that is, are not placed right above the hot rolling steel sheet 10. In
the following description, it is assumed that the width of the steel sheet conveyance
plane and the width of the hot rolling steel sheet 10 coincide. Each numerical value
is defined on the steel sheet conveyance plane; the hot rolling steel sheet 10 has a
15 prescribed thickness of approximately 1.0 mm to 30 mm, which is almost the same
as the value defined on the steel sheet conveyance plane. One end 10a of the hot
rolling steel sheet 10 at which the water removing nozzles 30 and 31 are placed may
be referred to as a near end 10a, and the other end 10b (the end on the negative Xdirection
side in the drawing) facing the near end 10a may be referred to as a far end
20 lob. The water removing nozzles 30 and 3 1 are aligned in the conveyance direction
of the hot rolling steel sheet 10.
[0040]
As the near water removing nozzle 30, for example, a flat spay nozzle is
used; the near water removing nozzle 30 jets a jet flow of water-removing water to
25 the steel sheet at a spread angle Oa of, for example, 30 degrees to 70 degrees in such
a manner that the angle between a plane including the flat spaying plane and the steel
sheet plane is not less than 80 degrees and not more than 100 degrees. Hereinafier,
the jet flow of water-removing water jetted from the near water removing nozzle 30
is referred to as a near jet flow 40. The near jet flow 40 collides with the surface of
30 the hot rolling steel sheet 10, and a near end water removal single area 41
(hereinafter, referred to as simply a near area ill) that is the area of collision of waterremoving
watcr spreading from the near end 10a to the center side (a water removal
single area) is formed on the surface of the hot rolling steel sheet 10. The near area
41 includes the near end 10a, but does not include the far end 10b. The near area 41
is formed such that, in a planar view, its long axis has an angle of -1 5 degrees to 15
5 degrees with the width direction of the hot rolling steel sheet 10. Here, with regard
to the plus or minus sign, the angle to the direction of the jet flow at the downstream
side in the running direction of the steel sheet is defined as plus.
[004 1 ]
As the far water removing nozzle 3 1, for example, a flat spay nozzle is used;
10 the far water removing nozzle 3 1 jets a jet flow of water-removing water to the steel
sheet at a spread angle Qb of, for example, 10 degrees to 20 degrees, which is smaller
than the spread angle Oa of the near jet flow 40 in such a manner that the angle
between a plane including the flat spaying plane and the steel sheet plane is not less
than 80 degrees and not more than 100 degrees. Hereinafter, the jet flow of water-
15 removing water jetted from the far water removing nozzle 31 is referred to as a far jet
flow 42. If the spread angle Qb of the far jet flow 42 is large, the force of pushing
out cooling water is weak as described later; thus, the spread angle Ob is set to, for
example, 10 degrees to 20 degrees as described above. The far jet flow 42 collides
with the surface of the hot rolling steel sheet 10, and a far end water removal single
20 area 43 (hereinafter, referred to as simply a far area 43) that is the area of collision of
water-removing water spreading from the far end 10b to the center side (a water
removal single area) is formed. The far area 43 includes the far end lob, but does
not include the near end 10a. The far area 43 is formed such that its far-end-side
end 43b is located closer to the downstream side than its center-side end 43a, that is,
25 formed such that, in a planar view, its long axis is inclined from the width direction
of the hot rolling steel sheet 10 by a prescribed angle Qc of, for example 5, degrees.
The angle Oe is not limited to that of the embodiment, and is set arbitrarily in the
range of 0 degrees to 15 degrees. This is because, if the angle Oe is 0 degrees or
less, water may leak to the opposite side to the direction of the flow of the far area 43.
30 If the angle Oe is 15 degrees or more, the area where the cooling water 50 flows is
different between the near end 10a side and the far end 10b side, and the temperature
uniformity in the width direction of the stccl sheet is worsened.
[0042]
The water removing nozzles 30 and 31 are arranged such that the near area
41 and the far area 43 cover thc entire area in the width direction of the hot rolling
5 steel sheet 10. The near water removing no~zle3 0 is placed closer to the upstream
side in the conveyance direction, that is, closer to the upstream side of the flow of
cooling water than the far water removing nozzle 31. That is, the near area 41 is
formed in a manner that the near area 41is closer to the upstream side than the far
area 43. The near water removing nozzle 30 is placed in a higher position in the
10 vertical direction than the far water removing nozzle 3 1.
[0043]
Next, a method of removing cooling water using the water removing
apparatus 16 configured as described above is described. In FIG. 4, the arrows on
the hot rolling steel sheet 10 indicate the flows of cooling water 50 and discharging
15 waters 51 and 52 after the cooling water hits the near area 41 and the far area 43.
[0044]
The cooling water 50 on the hot rolling steel sheet 10 is intercepted by the
near jet flow 40 horn the near water removing nozzle 30. At this time, the speed of
the discharging water 51 in the near area 41 becomes slower, and accordingly the
20 height of the discharging water 5 1 becomes higher. The discharging water 5 1 is
blocked by the near area41, and part of the discharging water 5 1 is discharged to the
near end 10a side and the rest is pushed out to the far end 10b side of the hot rolling
steel sheet 10. Part of the pushed out discharging water 51 is discharged to the
lateral side of the far end lob. On the other hand, the rest of the discharging water
25 51 flows horn between the near area 41 and the far end lob to the far area 43 side.
[0045]
Then, the discharging water 52 that has flowed from the near area 41 is
blocked by the far area 43 formed by the far jet flow 42 from the far water removing
nozzle 3 1, is pushed out to the far end 10b side, and is discharged from the far end
30 lob to the latcral side. At this time, the specd of the discharging water 52 is faster
than the specd of the discharging water 51 in the near area 41, and thc height of the
discharging water 52 is lower. Therefore, evcn when the height of the far jet flow
42 is low, a spccd in the width direction can be given to the discharging water 52,
and thc discharging water 52 is discharged from the far end 10b appropriately.
Since as described above the h r area 43 is formed at an angle such that the far-end-
5 side end 43b is located closcr to the downstream side than the center-side end 43a,
the cooling water 50 is smoothly discharged from the far end lob. Therefore, the
cooling water 50 does not flow to the downstream side of the far area 43. Thus, the
removal of the cooling water 50 is continuously performed from the near end 10a to
the far end 10b.
10 [0046]
In the removal of the cooling water 50, the sum total of the momenta of the
water removing nozzles 30 and 31 is a momentum exceeding a momcntum that is
enough to change the direction of the flow at a prescribed flow rate of the cooling
water that flows on the hot rolling steel sheet from the upstream side in the
15 conveyance direction, to the directions toward the ends of the steel sheet. Therefore,
the removal of the cooling water 50 is perfomled more appropriately by the water
removing apparatus 16.
[0047]
Thus, according to the embodiment the removal of the cooling water 50 can
20 be performed appropriately even when the cooling water 50 has a large water flow
density of 1 .O to 10 u~~im~lmin.
[0048]
The near jet flow 40 from the near water removing nozzle 30 mainly has the
function of intercepting cooling water, and the far jet flow 42 from the far water
25 removing nozzle 31 mainly has the function of pushing out cooling water. By thus
separating the functions of the near water removing nozzle 30 and the far water
removing nozzle 31, the amount of water-removing water jetted from each of the
water removing nozzles 30 and 31 can be reduced. Therefore, the water removal
efficiency ofthe cooling water 50 can be improved.
30 100491
Furthermore, the two water removing nozzles 30 and 31 are placed on the
lateral side of the near end 10a or the hot rolling stecl shcct 10, and the installation
space is small. Therefore, the installation flexibility of the water lemoving
apparatus 16 is high, and the placement of the cooling apparatus 15 is not influenced
by the water removing apparatus 16. Therefore, the cooling performance on the hot
5 rolling steel sheet 10 can be ensured appropriately.
[0050]
Although the case of the large amount of the cooling water 50 is described
in the above embodiment, the present invention can be applied also to the case of
removing a small amount of cooling water. In such a case, a small amount of
10 cooling water can be removed appropriately by the same principle as above.
Furthermore, the amount of water-removing water can be reduced, and the water
removal efficiency of cooling water can be improved.
LO05 1 ]
Next, the present inventors conducted studies on more preferrcd conditions
15 of the water removing apparatus 16. Thus, it has been found that the removal of
cooling water can be performed more appropriately when a first condition to a fifth
condition described below are satisfied.
(1) First condition: the ratio of the distance in the width direction of the near area 41
to the width of the hot rolling steel sheet 10 (hereinafter, referred to as a near area
20 width A; see FIG. 3) be more than 0.2 and less than 0.6.
(2) Second condition: the ratio of the distance in the width dircclion of the
overlapping area of the near area 41 and the far area 43 to the width of the hot rolling
steel sheet 10 (hereinafter, referred to as an overlapping width B; see FIG. 3) be more
than 0.0 and less than 0.2.
25 (3) Third condition: the angle between the near jet flow 40 and the hot rolling steel
sheet 10 at the center-side end 41a of the near area 41 (hereinafter, referred to as a
near jet flow angle C; sce FIG. 3) be more than 15 degrees and less than 50 degrees.
(4) Fourth condition: the angle between the far jet flow 42 and the hot rolling steel
sheet 10 at the center-side end 43a of the far area 43 (hereinafter, referred to as a far
30 jet flow angle D; see FIG. 3) be more than 10 dcgrees and less than 30 degrccs.
(5) Fifth condition: the ratio of the distance in the conveyance direction between the
ncar watcr removing nonle 30 and the far water 1.ernoving nozzle 31 (hereinafter,
refcncd to as an inter-nozzle distance E; scc FIG. 4) to the distance in (he conveyance
dircction bctwccn the centers of a pair of conveyor rolls 18 and 18 adjacent in the
conveyance direction (hereinafter, referred to as a roll pitch) be larger than 0.25.
5 100521
The bases of the thresholds of the first condition to the fifth condition arc
described in detail in Examples described later, Including specific flows of cooling
water.
lo0531
10 Further, the present inventors have found that the uniformity of cooling of
the hot rolling steel sheet 10 can be improved whcn a sixth condition described
below is satisfied.
(6) Sixth condition: the inter-nozzle distance E be less than 0.95.
[0054]
15 If the inter-nozzle distance E is large as shown in FIG. 5, a certain space 60
is formed between the near area 41 and the far area 43. Consequently, the cooling
water 50 that has flowed from the near area 41 cools the hot rolling steel sheet 10 in
the space 60. That is, the hot rolling steel sheet 10 is excessively cooled in the
space 60, and the cooling of the hot rolling steel sheet 10 is made non-uniform.
20 Furthermore, if the inter-nozzle distance E is large, the near water removing nozzle
30 or the far water removing nozzle 31 may interfere with another apparatus, and
there is a problem in terms of the facility.
[0055]
In this respect, when the sixth condition mentioned above is satisfied, the
25 space 60 can be minimized, and the hot rolling steel sheet 10 can be uniformly
cooled in the width direction. Therefore, the material quality of the hot rolling steel
sheet 10 can be made uniform, and the deformation situation during processing is
lessened. With the same typical strength, the amount of alloy for strength
iinprovemcnt can be reduced because a part where the material quality is reduced is
30 not present; thus, a hot rolling steel sheet 10 wit11 a low cost and a low environmental
load during recycling can be provided. In addition, the near water removing nozzle
30 and the far water removing nozzle 3 1 can be closely arranged, and thc installation
space is small; therelore, the problem in terms ol the facility described above can be
eliminated.
[0056 1
5 <4. Other embodiments>
Next, other embodiments of the water removing apparatus 16 are described.
[0057]
<4-1. Another embodiment>
In the water removing apparatus 16 of the above embodiment, the two water
10 removing nozzles 30 and 3 1 are placed on the lateral side of the near end 10a of the
hot rolling steel sheet 10; but three or more water removing nozzles may be placed.
For example, as shown in FIG. 6 and FIG. 7, three water removing nozzles 100 to
102 are aligned in this order in the conveyance direction of the hot rolling steel sheet
10 on the lateral side of the near end 10a of the hot rolling steel sheet 10.
15 [0058]
As the near water removing nozzle 100, for example, a flat spay nozzle is
used; the near water removing nozzle 100 jets a jet flow of water-removing water at a
spread angle 8d of, for example, 20 degrees to 50 degrees. Hereinafter, the jet flow
of water-removing water jetted from the near water removing nozzle 100 is referred
20 to as a near jet flow 110. The near jet flow 110 collides with the surface of the hot
rolling steel sheet 10, and a near end water removal single area 111 (hereinafter,
referred to as a near area 11 1) that is the area of collision of water-removing water (a
water removal single area) is formed on the surface of the hot rolling steel sheet 10.
The near area 111 includes the near end 10a, but does not include the far end lob.
25 The near area 111 is formed such that, in a planar view, its long axis has an angle of -
10 degrees to 10 degrees with the width direction of the hot rolling steel sheet 10.
LO0591
As the inner water removing nozzle 101, for example, a flat spay nozzle is
used; the inner water removing nozzle 101 jets a jet flow of water-removing water at
30 a spread angle Be of, for example 10 degrees to 40 degrees, which is smaller than the
spread angle Bd of the near jet flow 110. Hereinafter, the jet flow of waterremoving
water jctted Gom the inner water removing nozzle 101 is referred to as an
inner jet flow 112. The inner jet flow 112 collides with the surface of the hot
rolling steel sheet 10, and an inner water removal single area 113 (hereinafter,
referred to as an inner area 113) that is the area of collision of water-removing water
5 (a water removal single area) is formed on the surface of the hot rolling steel sheet 10.
The inner area 113 does not include either of the near end 10a and the far end lob.
The inner area 113 is formed such that its far-end-side end is located closer to the
downstream side than its center-side end, that is, formed such that, in a planar view,
its long axis is inclined from the width direction of the hot rolling steel sheet 10 by a
10 prescribed angle Of of, for example 2, degrees. The angle Of is not limited to that of
the embodiment, and is set to 0 degrees to 10 degrees.
[0060]
As the far water removing nozzle 102, for example, a flat spay nozzle is
used; the far water removing nozzle 102 jets a jet flow of water-removing water at a
15 spread angle 8g of, for example 5 degrees to 30 degrees, which is smaller than the
spread angle Oe of the inner jet flow 112. Hereinafter, the jet flow of waterremoving
water jetted from the far water removing nozzle 102 is referred to as a far
jet flow 114. The far jet flow 114 collides with the surface of the hot rolling steel
sheet 10, and a far end water removal single area 115 (hereinafter, referred to as
20 simply a far area 115) that is the area of collision of water-removing water (a water
removal single area) is formed on the surface of the hot rolling steel shcet 10. The
far area 115 includes the far end lob, but does not include the near end 10a. The far
area 115 is formed such that its far-end-side end is located closer to the downstream
side than its center-side end, that is, formed such that, in a planar view, its long axis
25 is inclined from the width direction of the hot rolling steel sheet 10 by a prescribed
angle Oh of, for example, 5 degrees. The angle Oh is not limited to that of the
embodiment, and is set to 0 degrees to 10 degrees. If the installation position of the
far water removing nozzle 102 is too low, the cooling water 50 may go over the far
jet flow 114 and flow to the downstream side; thus, the far water removing nozzle
30 102 is preferably placed such that the angle 0s between the far jet flow 114 and the
hot rolling steel sheet 10 is larger than, for example, 10 degrees.
[006 1 ]
In the embodiment, the inncr water removing nozzle 101 and the far water
removing nozzle 102 constitute a far water removing nozzle group of the present
invention.
5 [0062]
The near area 11 1, the inner area 11 3, and the far area 11 5 individually
cover three areas of the upper surface of the hot rolling steel sheet 10 that are three
areas divided in the width direction, that is, divided in the same number as the water
removing nozzles 100 to 102. The near area 11 1 and the inner area 11 3 adjacent in
10 the width direction overlap in the width direction, and similarly the inner area 113
and the far area 115 overlap in the width direction. The near area 11 1, the inner
area 113, and the far area 115 cover the entire area in the width direction of the hot
rolling steel sheet 10. Further, the near area ill, the inner area 113, and the far area
11 5 are formed so as to be aligned in this order from the near end 10a side to the far
15 end 10b side of the hot rolling steel sheet 10. Further, the near area 111, the inner
area 113, and the far area 115 are formed so as to be aligned in this order from the
upstream side to the downstream side in the conveyance direction.
[0063]
In the embodiment, the second condition, the fifth condition, and the sixth
20 condition described above are satisfied.
(2) Second condition: each of the ratio of the distance in the width direction of the
overlapping area of the near area 11 1 and the inner area 11 3 to the width of the hot
rolling steel sheet 10 (hereinafter, referred to as an overlapping width B1; see FIG. 6)
and the ratio of the distance in the width direction of the overlapping area of the
25 inner area 113 and the far area 115 to the width of the hot rolling steel sheet 10
(hereinafter, referred to as an overlapping width B2; see FIG. 6) be more than 0.0 and
less than 0.2. The overlapping width B1 and the overlapping width B2 may be
different.
(5) Fifth -condition: each of the ratio of the distance in the conveyance direction
30 bctween the near water removing nozzle 100 and the inner water removing nozzle
101 (hereinafter, refelled to as an inter-nozzle distance El; see FIG 7) to the roll
pitch and the ratio of the distance in the conveyance direction between the inner
water removing nozzle 101 and the far water removing nozzle 102 (hcreinaftel;
referred to as an inter-nozzle distance E2; see FIG. 8) to the roll pitch be larger than
0.25.
5 (6) Sixth condition: each of the inter-nozzle distances El and E2 be less than 0.95.
The sixth condition is, as described above, a condition for minimizing the space 60
shown in FIG. 5 to uniformly cool the hot rolling steel sheet 10 in the width direction.
Thus, although in the drawings of the following embodiments it may appear that the
space 60 is formed for convenience of illustration, in practice the space 60 is
10 minimized.
[0064]
In such a case, as shown in FIG. 7, the cooling water 50 on the hot rolling
steel sheet 10 is bloclted by the near area 111, and part of the cooling water 50 is
discharged to the near end 10a side and the rest is pushed out to the far end 10b side
15 of the hot rolling steel sheet 10. Part of the pushed out discharging water 51 is
discharged to the lateral side of the far end lob; on the other hand, the rest of the
discharging water 5 1 flows to the inner area 11 3 side.
[0065]
Subsequently, the discharging water 52 that has flowed from the near area
20 11 1 is blocked by the inner area 113, and is pushed out to the far end lob side of the
hot rolling steel shect 10. Part of the pushed out discharging water 52 is discharged
to the lateral side of the far end lob; on the other hand, the rest of the discharging
water 52 flows to the far area 115 side. At this time, since the inner area 113 is
formed at an angle as described above, the discharging water 52 is smoothly
25 discharged from the far end lob.
[0066]
The discharging water 53 that has flowed from the inner area 11 3 is blocked
by the far area 11 5, is pushed out to the far end lob side, and is discharged from the
far end lob to the lateral side. At this time, since the far area 115 is formed at an
30 angle as described above, the discharging water 53 is smoothly discharged from the
far cnd lob. Thus, the reinoval of the cooling water 50 is continuously performed
from the ncar end 10a to the rar end 1 Ob.
[0067]
In the removal of the cooling water 50, the sum total of the monienla of the
water removing nozzles 100 to 102 is a momentum exceeding a momentum that is
5 enough to change the direction of the flow at a prescribed flow rate of the cooling
water that flows on the hot rolling steel sheet from the upstream side in the
conveyance direction, to the directions toward the ends of the steel sheet. Therefore,
the removal of the cooling water 50 is performed more appropriately by the water
removing apparatus 16.
10 [0068]
Also in the embodiment, similar effects to the embodiment described above
can be exhibited. That is, the near jet flow 110 and the inner jet flow 112 mainly
have the function of intercepting cooling water, and the far jet flow 114 mainly has
the function of pushing out cooling water. By thus separating the functions of the
15 water removing nozzles 100 to 102, the amount of water-removing water jetted from
each of the water removing nozzles 100 to 102 is reduced. Even when the cooling
water 50 has a large water flow density, the removal of the cooling water 50 can be
performed appropriately.
[0069]
20 In the case where a plurality of water removing nozzles 100 to 102 are
placed on the lateral side of the near end 10a of the hot rolling steel shccl 10, in order
to perform the removal of the cooling water 50 appropriately, it is necessary that the
near area 11 1, the inner area 11 3, and the far area 11 5 be formed so as to be aligned
in this order in the conveyance direction of the hot rolling steel sheet 10 and be
25 aligned in this order from the near end 10a side to the far end 10b side, as described
above.
[0070]
In the case where, for example as shown in FIG. 8, the near area 11 1, the far
area 115, and the inner area 113 are formed to be aligned in this order in the
30 coiiveyance direction, even when the second condition is satisfied, the cooling water
that bas flowed from bet\veen the near area 11 1 and the far area 115 may pass
through between the inner area 113 and the far end lob and flow to the downstream
side.
100711
In the case where, for example as shown in FIG. 9, the inner area 113, the
5 near area 111, and the far area 115 are formed to be aligned in this order in the
conveyance direction, even when the second condition is satisfied, the cooling water
that has flowed from between the inner area 113 and the near area 111 may pass
through between the far area 115 and the near end 10a and flow to the downstream
side.
10 100721
In the case where, for example as shown in FIG. 10, the inner area 113, the
far area 115, and the near area 111 are formed to be aligned in this order in the
conveyance direction, even when the second condition is satisfied, the cooling water
that has flowed from between the far area 115 and the near end 10a may pass through
15 between the near area 11 1 and the far end lob and flow to the downstream side.
(00731
In the case where, like above, the near area- 1 11, the inner area 113, and the
far area 115 are not aligned in this order in the conveyance direction of the hot
rolling steel sheet 10, even when the second condition is satisfied, there is a case
20 where the removal of the cooling water 50 cannot be performed appropriately.
100741
Although in the above embodiment one inner water removing nozzle 101 is
provided in the far water removing nozzle group, two or more inner water removing
nozzles 101 may be provided. For example, as shown in FIG. 11, two inner water
25 removing nozzles lOla and lO1h are arranged in this order in the conveyance
direction between the near water removing nozzle 100 and the far water removing
nozzle 102. The inner water removing nozzles lOla and lOlh jet inner jet flows
112a and 112b, respectively, and form inner areas 113a and 113b in such a manner
that the inner areas 113a and 113b are aligned in this order from the near end 10a
30 side to the far end lob side. Also in such a case, similar effects to the embodiment
described above can be exhibited; that is, even when the cooling water 50 has a large
water flow density, the removal of the cooling water 50 can be performed
appropriately.
100751
Although in the above embodiments one single far water removing no~zle
5 31 is provided in FIG. 4 and one far water removing nozzle group (the water
removing nozzles 101 and 102) is provided in FIG. 7 and FIG. 11, two or more single
far water removing nozzles 3 1 or two or more far water removing nozzle groups may
be provided. Further, a single far water removing nozzle 3 1 and a single far water
removing nozzle group illustrated may be placed in combination.
10 [0076]
(4-2. Another embodiment>
Although in the water removing apparatus 16 of the above embodiments the
water removing nozzles 30 and 3 1 are placed on the lateral side of the one end 10a of
the hot rolling steel sheet 10, water removing nozzles may be placed on the lateral
15 side of both sides of the hot rolling steel sheet 10. For example, as shown in FIG.
12 and FIG. 13, a first water removing nozzle 120 is placed on the lateral side of the
one end 10a of the hot rolling steel sheet 10, and a second water removing nozzle
121 is placed on the lateral side of the other end lob. The water removing nozzles
120 and 121 are aligned in this order in the conveyance direction of the hot rolling
20 steel sheet 10. Both the water removing nozzles 120 and 121 correspond to a far
water removing nozzle of the present invention.
[0077]
As the first water removing nozzle 120, for example, a flat spay nozzle is
used; the first water removing nozzle 120 jets a jet flow of water-removing water at a
25 spread angle Bi of, for example, 5 degrees to 40 degrees. Hereinafter, the jet flow of
water-removing water jetted from the first water removing nozzle 120 is referred to
as a first jet flow 130. The first jet flow 130 collides with the surlace of the hot
rolling steel sheet 10, and a first water removal single area 131 that is the area of
collision of water-removing water is formed on the surface of the hot rolling steel
30 sheet 10. The first water removal single area 131 (a far end water removal single
area) is formed such that, in a planar view, its long axis has an angle of 0 degrees to
10 degrees with the width dircction ofthe hot rolling stcel sheet 10.
[0078l
As thc second water removing nozzle 121, for example, a flat spay riozzlc is
used; the second watcr removing nozzle 121 jets a jet flow of water-removing water
5 at a spread angle Oj of, for example, 5 degrees to 30 degrees. Hereinalter, the jet
flow of water-removing water jetted from the second water removing nozzle 121 is
referred to as a second jet flow 132. The second jet flow 132 collides with the
surface of the hot rolling steel sheet 10, and a second water removal single area 133
(a far end water removal single area) that is the area of collision of water-removing
10 water is formed on the surface of the hot rolling steel sheet 10. The second water
removal single area 133 is formed such that its one-end-side end is located closer to
the downstream side than its center-side end, that is, formed such that, in a planar
view, its Long axis is inclined from the width direction of the hot rolling steel sheet 10
by a prescribed angle Ok of, for example, 5 degrees. The angle 8k is not limited to
15 that of the embodiment, and is set to 0 degrees to 10 degrees.
[0079]
The first water removal single area 131 extends from the other end lob to
the center side, and the second water removal single area 133 extends from the one
end 10a to the center side. The first water removal single area 131 and the second
20 water removal single area 133 overlap in the width direction, and cover the entire
area in the width direction of the hot rolling steel sheet 10. In the embodiment, the
second condition, the fifth condition, and the sixth condition described above are
satisfied.
[0080]
25 In such a case, as shown in FIG. 13, the cooling water 50 on the hot rolling
steel sheet 10 is blocked by the first water removal single area 131, is pushed out to
the other end lob side of the hot rolling steel sheet 10, and is discharged to the lateral
side of the other end lob. The cooling water 50 and the discharging water 51 that
have flowed from between the first water removal single area 131 and the onc end
30 10a are bloclted by the second water removal single area 133, are pushed out to the
one end 10a side of the hot rolling stecl sheet 10, and are discharged to the lateral
side ofthc one end 10a. Thus, thc renloval of the cooling watel 50 1s pcrfonncd.
[0081]
In the removal of the cooling water 50, the sum total or the momenta of the
water removing nozzles 120 and 121 is a momentum excecding a momentum that is
5 enough to change the direction of the flow at a prescribed flow rate of the cooling
water that flows on the hot rolling steel sheet from the upstream side in the
conveyance direction to the directions toward the ends of the steel sheet. Therefore,
the removal of the cooling water 50 is performed more appropriately by the water
removing apparatus 16.
10 [0082]
Also in the embodiment, similar effects to the embodiment described above
can be exhibited; that is, even when the cooling water 50 has a large watcr flow
density, the removal of the cooling water 50 can be performed appropriately.
[0083]
15 In addition, since the first jet flow 130 from the first water removing nozzle
120 on the lateral side of the one end 10a is not directly jetted to the one end 10a, an
excessive temperature decrease of the hot rolling steel sheet 10 at the one end 10a
can be suppressed. Similarly, since the second jet flow 132 from the second water
removing nozzle 121 on the lateral side of the other end lob is not directly jetted to
20 the other end lob, an excessive temperature decrease of the hot rolling steel sheet 10
at the other end lob can be suppressed. Therefore, temperature unevenness in the
width direction of the hot rolling steel sheet 10 can be prevented, and a uniform steel
sheet can be produced.
[0084]
25 Furthermore, the spread angle Oi of the first jet flow 130 and the spread
angle 8j of the second jet flow 132 may be reduced, and thereby the momentum that
transports water-removing water from each of the water removing nozzles 120 and
121 to the hot rolling steel sheet 10 can be increased; thus, the water removal
performance is increased.
30 [0085]
<4-3. Another embodiment>
Although in the water removing apparatus 16 of thc above embodiment the
two water removing nozzles 120 and 121 are placed on the lateral side of both sides
of the hot rolling steel sheet 10, three or more water removing nozzles may be placed.
For example, as shown in FIG. 14 and FIG. 15, a first water removing nozzle 140 is
5 placed on the lateral side of the other end 10b of the hot rolling steel sheet 10, and a
second water removing nozzle 141 and a third water removing nozzle 142 are placed
on the lateral side of the one end 10a. The water removing nozzles 140 to 142 are
aligned in this order in the conveyance direction of the hot rolling steel sheet 10.
The first water removing nozzle 140 corresponds to a single far water removing
10 nozzle of the present invention. Further, the second water removing nozzle 141
corresponds to an inner water removing nozzle of the present invention, and the third
water removing nozzle 142 corresponds to a far water removing nozzle of the present
invention; the second water removing nozzle 141 and the third water removing
nozzle 142 constitute a far water removing nozzle group.
15 [0086]
As the first water removing nozzle 140, for example, a flat spay nozzle is
used; the first water removing nozzle 140 jets a jet flow of water-removing water at a
spread angle Om of, for example, 5 degrees to 30 degrees. Hereinafter, the jet flow
of water-removing water jetted from the first water removing nozzle 140 is referred
20 to as a first jet flow 150. The first jet flow 150 collides with the surface of the hot
rolling steel sheet 10, and a first water removal single area 151 that is the area of
collision of water-removing water is formed on the surface of the hot rolling steel
sheet 10. The first water removal single area 151 (a far end water removal single
area) is formed such that, in a planar view, its long axis is parallel to the width
25 direction of the hot rolling steel sheet 10.
[0087]
As the second water removing nozzle 141, for example, a flat spay nozzle is
used; the second water removing nozzle. 141 jets a jet flow of water-removing water
at a spread angle On of, for example, 10 degrees to 40 degrees. Hereinafter, the jet
30 flow of water-removing water jetted from the secoild water removing nozzle 141 is
referred to as a second jet flow 152. The second jet flow 152 collides with the
surface of the hot rolling steel shect 10, and a second water removal singlc arca 153
(an inner water removal single area) that is the area of collision oC water-removing
water is formed on the surCace of the hot rolling steel sheet 10. The second watcr
removal single area 153 is formed such that its other-end-side end is located closcr to
5 the downstream side than its center-side end, that is, folmed such that, in a planar
view, its long axis is inclined from the width direction of the hot rolling steel sheet 10
by a prescribed angle 8p of, for example, 2 degrees. The angle 8p is not limited to
that of the embodiment, and is set to 0 degrees lo 10 degrees.
[OOSS]
10 As the third water removing nozzle 142, for example, a flat spay nozzle is
used; the third water removing nozzle 142 jets a jet flow of cooling water at a spread
angle Bq of, for example, 5 degrees to 30 degrees, which is smaller than the spread
angle On of the second jet flow 152. Hereinafter, the jet flow of cooling water jetted
from the third water removing nozzle 142 is referred to as a third jet flow 154. The
15 third jet flow 154 collides with the surface of the hot rolling steel sheet 10, and a
third water removal single area 155 (a far end water removal single area) that is the
area of collision of water-removing water is formed -on the surface of the hot rolling
steel sheet 10. The third water removal single area 155 is formed such that its
other-end-side end is located closer to the downstream side than its center-side end,
20 that is, formed such that, in a planar view, its long axis is inclined from the width
direction of the hot rolling steel sheet 10 by a prescribed angle Or of, for example, 5
degrees. The angle Or is not limited to that of the embodiment, and is set to 0
degrees to 10 degrees.
[0089]
25 The first water removal single area 15 1 extends from the one end 10a to the
center side, the second water removal single area 153 extends between the one end
10a and the other end lob, and the third water removal single area 155 extends from
the other end lob to the center side. The first water removal single area 15 1 and the
second watcr removal single arca 153 overlap in the width direction, and similarly
30 the second water removal single area 153 and the third water removal singlc area 155
overlap in the width direction. The water removal single areas 151, 153, and 155
cover thc entire area in the width dircction of the hot rolling steel sheet 10.
[0090]
In the embodiment, the second condition, ihe fifth condition, and the sixth
condition described above are satisfied.
5 (2) Second condition: each of the ratio of the distance in the width direction of the
overlapping area of the first water removal single area 151 and the second water
removal single area 153 to the width of the hot rolling steel sheet 10 (hereinafter,
referred to as an overlapping width B1; see FIG. 14) and the ratio of the distance in
the width direction of the overlapping area of the second water removal single area
10 153 and the third water removal single area 155 to the width of the hot. rolling steel
sheet 10 (hereinafter, rcferred to as an overlapping. width B2; see FIG. 14) be more
than 0.0 and less than 0.2. The overlapping width B1 and the overlapping width B2
may be different.
(5) Fifth condition: each of the ratio of the distance in the conveyance direction
15 between the first water removing nozzle 140 and the second water removing nozzle
141 (hereinafter, referred to as an inter-nozzle distance El; see FIG. 15) to the roll
pitch and the ratio of the distance in the conveyance direction between the second
water removing nozzle 141 and the third water removing nozzle 142 (hereinafter,
referred to as an inter-nozzle distance E2; see FIG. 15) to the roll pitch be larger than
20 0.25.
(6) Sixth condition: each of the inter-nozzle distances El and E2 be lcss than 0.95.
The sixth condition is a condition for minimizing the space 60 shown in FIG. 5 to
uniformly cool the hot rolling steel sheet 10 in the width direction, as described
above. Thus, although in the drawings of the following embodiments it may appear
25 that the space 60 is formed for convenience of illustration, in practice the space 60 is
minimized.
[0091]
In such a case, as shown in FIG. 15, the cooling water 50 on the hot rolling
steel sheet 10 is blocked by the first water removal single area 151, is pushed out to
30 the one end 10a side of the hot rolling steel sheet 10, and is discharged to the lateral
side of ihc one end 10a.
Subsequently, the discharging water 52 that has flowed from between the
first water removal single area 15 1 and the other end 1 0b is bloclted by the second
water removal single area 153, and is pushed out to thc othcr end 10b side of the hot
5 rolling steel sheet 10. Part of the pushed out cooling water 50 is discharged to the
lateral side of the other end lob; on the other hand, the rest of the discharging water
53 flows to the third water removal single area 155 side. At this time, since the
second water removal single area 153 is formed at an angle as described above, the
cooling water 50 is smoothly discharged from the other end lob.
10 (00931
The discharging water 53 that has flowed from the second water removal
single area 153 is blocked by the third water removal single area 155, is pushed out
to the other end 10b side, and is discharged from the other end 10b to the lateral side.
At this time, since the third water removal single area 155 is formed at an angle as
15 described above, the cooling water 50 is smoothly discharged from the other end lob.
Thus, the removal of the cooling water 50 is performed.
[0094]
In the removal of the cooling water 50, the sum total of the momenta of the
water removing nozzles 140 to 142 is a momentum exceeding a momentum that is
20 enough to change the direction of the flow at a prescribed flow rate of the cooling
water that flows on the hot rolling steel sheet from the upstream side in the
conveyance direction, to the directions toward the ends of the steel sheet. Therefore,
the removal of the cooling water 50 is performed more appropriately by the water
removing apparatus 16.
25 [0095]
Also in the embodiment, similar effects to the embodiment described above
can be exhibited; that is, even when the cooling water 50 has a large water flow
density, the removal of the cooling water 50 can be performed appropriately.
[0096]
30 In the above embodiment, as shown in FIG. 16, the first water rcinoving
nozzle 140 may be placed between the second water removing nozzle 141 and the
third water removing nozzle 142 in the conveyance direction of the hot rolling steel
sheet 10. Further, as shown in FlG. 17, the first water removing nozzle 140 may be
placed on the downstream side of thc third water removing nozzle 142. In any case,
the removal of the cooling water 50 can be perlormed appropriately.
6 100971
However, in order to perform thc removal of the cooling water 50
appropriately, it is necessary that the first water removal single area 151 from the
other end 10b side cover the upper surface of the one end 10a of the hot rolling steel
sheet 10, and the third water removal single area 155 from the one end 10a side cover
10 the upper surface of the other end 10b of the hot rolling steel sheet 10, as described
above. Further, it is necessary that the second water removal single area 153 and
the third water removal single area 155 from the one end 10a side be formed to be
aligned in this order in the conveyance direction of the hot rolling steel sheet 10 and
be aligned adjacent to each other in this order from the one end 10a side to the other
15 end 10b side.
COO981
FIG. 18 and FIG. 19 show cases where not all the conditions mentioned
above are satisfied and the removal of the cooling water 50 cannot be performed
appropriately, for example.
20 100991
FIG. 18 shows, for example, a case where the first water removal single area
15 1 from the other end 10b side does not cover the upper surface of the one end 1 Oa
of the hot rolling steel sheet 10, and the third water removal single area 155 from the
one end 10a side does not cover the upper surface of the other end 10b of the hot
25 rolling steel sheet 10. In such a case, the cooling water that has flowed from
between the third water removal single area 155 and the other end 10b may pass
through between the first water removal single area 151 and the one end 10a and
flow to the downstream side. Consequently, the removal of the cooling water 50
cannot be performed appropriately.
30 [0100]
FIG. 19 shows, for example, a case where the iirst water removal single area
15 1 from the other end 10b side does not covcr thc upper surfacc of the one end 1 Oa
or the hot rolling steel sheet 10, and the second water removal single area 153 and
the third water removal single area 155 are not aligned adjacent to each othcr in this
order from the one end 10a side to the other end lob side. In such a casc. the
5 cooling water that has flowed from between the first water removal single area 151
and the one end 10a may pass though between the third water removal single area
155 and the one end 10a and flow to the downstrcam side. Consequently, the
removal of the cooling water 50 cannot be performed appropriately.
[0101]
10 In the above embodiments, one water removing nozzle 120 or 121 (single
far water removing nozzle) shown in FIG. 13 is provided on each side of the hot
rolling steel sheet 10, and one first water removing nozzle 140 (a single far water
removing nozzle) or one far water removing nozzle group (the water removing
nozzles 141 and 142) shown in FIG. 15 is provided on each side of the hot rolling
15 steel sheet 10; however, two or more water removing nozzle 120 or 121, or two or
more first water removing nozzle 140 and two or more far water removing nozzle
group may be provided. Further, a single far water removing nozzle and a far water
removing nozzle group illustrated may be combined and placed on both sides of the
hot rolling steel sheet 10.
20 [0102]
<4-4. Another embodiment>
Although in the above embodiments the water removing apparatus 16
removes the cooling water at the time of cooling the hot rolling steel sheet 10 after
finish rolling, the installation position of the water removing apparatus 16 is not
25 limited thereto. The hot rolling for which the water removing apparatus 16 of the
present invention is used comprises both thick sheet reverse rolling and thin sheet
continuous hot rolling. In each hot rolling, the water removing apparatus 16 may be
placed either on the upstream side and the downstream side of the rough rolling mill
or on the upstream side and the downstream side of the finish rolling mill, and may
30 perfom1 water removal at the time of cooling the hot rolling steel sheet before and
after rough rolling or before and after finish rolling.
[O 1031
Hereinabove, prcfcrred embodiments of the present invention are described
with reference to the appended drawings; but the prcscnt invention is not limited to
these examples. It is clear that one skilled in the art may arrive at various alteration
5 examples or modification examples within the idea described in the claims; such
examples should naturally fall within the technical scope of the present invention.
[Example I]
[0104]
Hereinbelow, effects of the first condition to the fifih condition in the case
10 where two water removing nozzles are placed on the lateral side of one end of a hot
rolling steel sheet are described. In the verification of the effects, the water
removing apparatus 16 shown in FIG. 3 was used as the water removing apparatus.
Table 1 shows the results ofthe verification.
[0105]
15 The common conditions in the verification are as follows. Each of the
pressures of cooling water jetted from the water removing nozzles 30 and 31 is 20
MPa. The amount of cooling water from the near water removing nozzle 30 is 160
Llmin, and the amount of cooling water from the far water removing nozzle 31 is
260 Llmin. The width of the hot rolling steel sheet 10 is 2000 mm, that is, each of
20 the reference distances of the near area width A of the first condition and the
overlapping width I3 of the second condition is 2000 mm. The roll pitch is 430 mm,
that is, the reference distance of the inter-nozzle distance E of the fifth condition is
430 mm.
[0 1061
25 In the verification, in a planar view, the distance between the near water
removing nozzle 30 and the near end 10a oT the hot rolling steel sheet 10 is 150 nun,
and similarly the distance between the far water removing nozzle 3 1 and the near end
10a is 150 mm. The present inventors have ascertained that, when the distances
between the water removing nozzlcs 30 and 31 and the near end 10a are in the range
30 of 110 mm to 300 mm, the height positions of the water removing nozzles 30 and 31
hardly shift, and the water removal effect hardly varies, either.
[OI 071
In the verification, Comparative Examples 1 to 10 are examples in which
not all the first condition to the fifth condition are satisfied, and thcir water
removability is assessed as "poor" in Table I. However, the verification is a
5 verification of showing that the removal of cooling water can be carried out more
reliably in the case where the first eondition to the fifth condition are satisfied
(Examples 1 to 9), and Comparative Examples 1 to 10 are mere comparison target
for Examples 1 to 9. Hence, although cases in Conlparative Examples 1 to 10
where the removal of cooling water cannot he carried out are shown in the following
10 description for ease of understanding, even such Comparative Examples 1 to 10
provide water removal efficiencies that are improved at least compared with
conventional ones, and the Comparative Examples do not necessarily show that they
fail to carry out the removal of cooling water.
101 081
15 First, the first condition is verified. In Examples 1 to 3 and Comparative
Examples 1 to 2 of the verification, the second eondition to the fifth condition are
satisfied.
[O 1091
In Comparative Example 1, the near area width A is 0.2. In such a case,
20 since as shown in FIG. 20 the near area 41 is narrow, the far jet flow 42 by itself
cannot push out the cooling water 50 to the far end 10b side, and the cooling water
50 goes over the far jet flow 42 from the upper side of the far jet flow 42 and leaks to
the downstream side of the far area 43. Therefore, the removal of the cooling water
50 cannot be performed appropriately.
25 [0110]
In Comparative Example 2, the near area width A is 0.6. In such a case,
since as shown in FIG. 21 the near area 41 is wide, the force with which the near jet
flow 40 pushes out the eooling water 50 is weak, and the cooling water 50 leaks near
the center of the near area 41. Therefore, the removal of the cooling water 50
30 cannot be performed appropriately.
[0111]
In contrast to thcsc Comparative Examples 1 to 2, in Exaruples 1 to 3, tl~c
near area width A is more than 0.2 and less than 0.6, and the first condition is
satisfied. It has been verified that in such cases the removal of the cooling water 50
is performed appropriately.
5 [0112]
Next, the second condition is verified. Jn Examples 4 to 5 and
Comparative Examples 3 to 4 of the verification, the first condition and the third
condition to the fifth condition are satisfied.
[0113]
10 In Comparative Example 3, the overlapping width B is 0.0. In such a case,
since as shown in FIG. 22 the near area 41 and the far area 43 do not overlap, the
cooling water 50 leaks from between the near area 41 and the far area 43.
Therefore, the removal of the cooling water 50 cannot be performed appropriately.
[0114]
15 In Comparative Example 4, the overlapping width B is 0.2. In such a case,
since as shown in FIG. 23 the overlapping area of the near area 41 and the far area 43
is wide, the spread angle of the far jet flow 42 is large, and the force with which the
far jet flow 42 pushes out the cooling water 50 is weak; consequently, the cooling
water 50 leaks on the far end 10b side of the far area 43. If the spread angle of the
20 far jet flow 42 is reduced, the cooling water 50 goes over the far jet flow 42 and leaks
at the far end lob 01' the far area 43. Therefore, the removal of the cooling water 50
cannot be performed appropriately.
[0115]
In contrast to these Comparative Examples 3 to 4, in Examples 4 to 5, the
25 overlapping width B is more than 0.0 and less than 0.2, and the second condition is
satisfied. Tt has been verified that in such cases the removal of the cooling water 50
is performed appropriately.
[0116]
Next, the third condition is verified. In Examples 6 to 7 and Co~uparative
30 Examplcs 5 to 6 of the verification, the first condition, the second conditim, the
fourth condition, and the fifth condition are satisfied.
101171
In Comparative Example 5, the near jet flow anglc C is 15 degrees. In
such a case, since as shown in FIG. 24 the area in the vertical direction of the near jet
flow 40 is narrow, the cooling water 50 goes over the near jet flow 40 and flows to
5 the downstream side; li~rther,s incc the upper end of the near jet flow 40 is located
below the lower end of the far jet flow 42, the cooling water 50 mentioned above
passes through the lower side of the far jet flow 42, and flows and leaks to the
downstream side. Therefore, the removal of the cooling water 50 cannot be
performed appropriately.
10 [0118]
In Comparative Example 6, the near jet flow angle C is 50 degrees. In
such a case, since as shown in FIG. 21 the near water removing nozzle 30 is placed in
a high position, the force with which the near jet flow 40 pushes out the cooling
water 50 is weak, and the cooling water 50 leaks from the near area 41. Therefore,
15 the removal of the cooling water 50 cannot be performed appropriately.
[0119]
In contrast to these Comparative Examples 5 to 6, in Examples 6 to 7, the
near jet flow angle C is more than 15 degrees and less than 50 degrees, and the third
condition is satisfied. It has been verified that in such cases the removal of the
20 cooling water 50 is performed appropriately.
[0120]
Next, the fourth condition is verified. In Examples 8 to 9 and Comparative
Examples 7 to 8 of the verification, the first condition to the third condition and the
fifth condition are satisfied.
25 [0121]
In Comparative Example 7, the far jet flow angle D is 10 degrees. In such
a case, since as shown in FIG. 20 the area in the vertical direction of the far jet flow
42 is narrow, the cooling water 50 goes over the far jet flow 42, and flows and leaks
to the downstream side. Therefore, the removal of the cooling water 50 caiinot be
30 perforlned appropriately.
[O 1221
In Comparative Example 8, thc far jet flow angle D is 30 degrees. In such
a case, since as shown in FIG. 23 the far watcr rcmoving nozzle 31 is placed in a high
position, the force with which the far jet flow 42 pushes out the cooling water 50 is
weak, and the cooling water 50 leaks on the far end 10h side of the far area 43.
5 Furthennore, since the spread anglc of the far jet flow 42 is large, the cooling water
50 leaks on thc far end 10b side of the far area 43. Therefore, the removal of the
cooling water 50 cannot be performed appropriately.
[0123]
In contrast to these Comparative Examples 7 to 8, in Examples 8 to 9, the
10 far jet flow angle D is more than 10 degrees and less than 30 degrees, and the fourth
condition is satisfied. It has been verified that in such cases the removal of the
cooling water 50 is performed appropriately.
[0124]
Next, the fifth condition is verified. In Comparative Examples 9 to 10 of
15 the verification, the first condition to the fourth condition are satisfied.
[0125]
In Comparative Example 9, the inter-nozzle distance E is 0.25. In such a
case, since the near area 41 and the far area 43 are too close, the cooling water 50
that has gone over the near area 41 also goes over the far area 43 and leaks.
20 Therefore, the removal of the cooling water 50 cannot be performed appropriately.
[0 1261
In Comparative Example 10, the inter-nozzle distance E is 0.95. In such a
ease, the fifth condition is satisfied, and the removal of the cooling water 50 is
performed appropriately. However, Comparative Example 10 does not satisfy the
25 sixth condition, and as described above there is a problem that the cooling of the hot
rolling steel sheet 10 is made non-uniform in the width direction.
[0 1271
From the above, it has been found that cooling water can be removed Inore
appropriately when the first condition to the fifth condition are satisfied. That is, it
30 has been found that the thresholds of the first condition to the fifth condition are

[Example 21
[0129]
Next, effects of the present invention in the case where three water
removing nozzles are placed on the lateral side of one end of a hot rolling steel sheet
5 are described. In the verification of the effects, the water removing apparatus 16
shown in FIG. 6 was used as the water removing apparatus. Table 2 shows the
results of the verification.
[0130]
The common conditions in the verification are as follows. Each of the
10 pressures of cooling water jetted from the water removing nozzles 100 to 102 is 20
MPa. The amount of cooling water from the near water removing nozzle 100 is 140
Llmin, the amount of cooling water from the inner water removing nozzle 101 is 160
Llmin, and the amount of cooling water from the far water removing nozzle 102 is
120 Llmin. The width of the hot rolling steel sheet 10 is 2000 mm, that is, the
15 reference distance of the overlapping widths B1 and B2 of the second condition is
2000 mm. The roll pitch is 430 mm, that is, the reference distance of the intcrnozzle
distances El and E2 of the fifth condition is 430 mm.
[0131]
In the verification, in a planar view, the distance between the near water
20 removing nozzle 100 and the near end 10a of the hot rolling steel sheet 10, the
distance between thc inner water removing nozzle 101 and the near end lOa, and the
distance between the far water removing nozzle 3 1 and the near end 10a are each 150
mm. The present inventors have ascertained that, when the distances between the
water removing nozzles 100 to 102 and the near end 10a are in the range of 11 0 mm
25 to 300 mm, the height positions of the water removing nozzles 100 to 102 hardly
vary, and the water removal effect hardly varies, either.
[0132]
In the verification, in addition to the verification of the overlapping widths
B1 and B2 of the second condition, the installation posilions of the water removing
30 nozzles 100 to 102 on the assuniption that the installation position of the water
removing liozzle on the most upstream side in the conveyance direction of the hot
rolling steel sheet 10 is 0 (zero) are verified. By vcrifying the installation position,
of the water removing nozzles 100 to 102, the fifth condition (the inter-nozzle
distances El and E2) is verified as well.
101331
5 In Example 10, as shown in FIG. 7, the near water rcmoving nozzle 100, the
inner water removing nozzle 101, and the far water removing nozzle 102 are aligned
in this order in the conveyance d~rection of the hot rolling steel sheet 10. Here,
each of the overlapping widths Bl and B2 is 0.1, and the second condition is satisfied.
Further, each of the inter-nozzle distances El and E2 is 0.3, and the fifth condition is
10 satisfied. It has been verified that in such a case the removal of the cooling water
50 is performed appropriately.
[0134]
In contrast, the overlapping width B1 is 0 (zero) in Comparative Example
11, and the overlapping width B2 is 0 (zero) in Comparative Example 12. That is,
15 Comparative Examples 11 and 12 do not satisfy the second condition; it has been
found that in such cases the removal of the cooling water 50 is not performed
appropriately.
[0135]
In Comparative Example 13, as shown in FIG. 8, the near area 111, the far
20 area 115, and the inner area 113 are formed to he aligned in this order in the
conveyance direction. In Comparative Example 14, as shown in FIG. 9, the inner
area 11 3, the near area 11 1, and the far area 11 5 are formed to be aligned in this order
in the conveyance direction. In Comparative Example 15, as shown in FIG. 10, the
inner area 11 3, the far area 11 5, and the near area 11 1 are formed to be aligned in this
25 order in the conveyance direction. It has been found that, in the case where the near
area 111, the inner area 113, and the far area 115 are not aligned in this order in the
conveyance direction of the hot rolling steel sheet 10 like in these Comparative
Examples 13 to 15, the cooling water 50 flows to the downstream side, and the
removal of the cooling water 50 cannot be performed appropriately, as described
30 above.
101361
Froin the above, it has been found that cooling water can be reinovcd
appropriatcly in thc case where three water removing nozzles are ananged on the
lateral side of one cnd of a hot rolling steel sheet in the manner of the present
invention.
5

Industrial Applicability
[0138]
Thc present invention is uscful in, when cooling a hot rolling steel shcct
after finish rolling of a hot rolling process, and removing cooling water jetted to the
5 hot rolling steel sheet, and is particularly useful in removing a large amount of
cooling water.
Refercnce Signs List
hot rolling facility
slab
hot rolling steel sheet
one end (near end)
other end (far end)
heating furnace
width-direction rolling mill
rough rolling mill
finish rolling mill
cooling apparatus
upper cooling apparatus
lower cooling apparatus
water removing apparatus
winding apparatus
conveyor roll
cooling water nozzle
cooling water nozzle
near water removing nozzle
far water removing nozzle
near jet flow
near area
center-side end
far let flow
far area
center-sidc end
far-end-side end
cooling water
discharging water
discharging water
discharging water
space
near water removing nozzle
inner water removing nozzle
far water removing nozzle
near jet flow
near area
inner jet flow
inner area
far jet flow
far area
first water removing nozzle
second water removing nozzle
first jet flow
first water removal single area
second jet flow
second water removal single area
first water removing nozzle
second water removing noz~le
third water removing nozzle
first jet flow
first water removal single area
second jet flow
second water removal single area
154 third jct flow
155 third water removal single area
CLAIMS
Claim 1
A water removing apparatus for steel sheet cooling water in a hot rolling
process that removes cooling water jetted to a hot rolling steel sheet when cooling
6 the hot rolling steel sheet before and after rough rolling or before and after finish
rolling of the hot rolling process,
the water removing apparatus comprising:
a plurality of water removing nozzles that are aligned in a conveyance
direction of the hot rolling steel sheet on one side or both sides in a width direction d'
10 a steel sheet conveyance plane and jet water-removing water to the steel sheet
conveyance plane,
wherein a water removal single area that is an area of collision of waterremoving
water jetted from one of the water removing nozzles in the steel sheet
conveyance plane has a prescribed width less than a width of the steel sheet
15 conveyance plane, and the plurality of water removing nozzles are arranged so as to
cover the entire area in the width direction of the steel sheet conveyance plane with
the plurality of water removal single areas,
one or more water removing nozzles that are placed on a lateral side of one
end in the width direction of the steel sheet conveyance plane among the plurality of
20 water removing nozzles comprise one or more of a single far water removing nozzle
and a far water removing nozzle group,
the single far water removing nozzle forms a far end water removal single
area that does not include the one end but includes another end in the width direction
of the steel sheet conveyance plane, and
25 the far water removing nozzle group comprises one or more inner water
removing nozzles and the far water removing nozzle, and one or more inner water
removal single areas, which the one or more inner water removing nozzles form and
which do not include either end in the width direction of the steel sheet conveyance
plane, and the far end water removal single area, which the far water removing
30 nozzle forms, are formed, the one or more inner water removal single areas and :he
far water removing nozzle being aligned in order from the onc end side to the other
end side while overlapping with each othcr in thc width dircction ofthe steel shect
conveyance plane and aligned in order from an upstream side to a downstream side
without overlapping in the conveyance direction.
5 Claim 2
The watcr removing apparatus for steel sheet cooling water in a hot rolling
process according to claim 1, wherein one or more of the single far water removing
nozzle(s) or one or more of the far water removing nozzle group(s) are placed on
both sides in the width direction of the steel sheet conveyance plane.
10
Claim 3
The watcr removing apparatus for steel sheet cooling water in a hot rolling
process according to claim 1,
wherein, in addition to the single far water removing nozzle or the far water
15 removing nozzle group, a near water removing nozzle is placed on the lateral side of
the one end in the width direction of the steel sheet conveyancc plane,
the near water removing nozzle forms a near end water removal single area,
which is not included in either a far end water removal single area that the single far
water removing nozzle forms or a far water removal area group that the far water
20 removing nozzle group forms and which includes the one end in the width direction
of the steel sheet conveyance plane on the upstream side in the conveyance direction
of the far end water removal single area or the far water removal area group, and
water removal is continuously performed by at least the single far water
removing nozzle or the far water removing nozzle group and the near water
25 removing nozzle from the one end to the other end in the width direction of the steel
sheet conveyance plane.
Claim 4
The water removing apparatus for steel sheet cooling water in a hot rolling
30 process according to any one of claims 1 to 3, wherein a water removing nozzle,
which is placed in thc downstream side at a second or a subsequent position lsom the
upstream sidc in the conveyance direction among the plurality of water removing
nozzles, forms thc water removal single arca in a manner that, in a planar view, a far
side of a long axis of the water removal single area is inclined from the width
direction toward the downstream side in the conveyance direction.
5
Claim 5
A water removing method for steel sheet cooling water in a hot rolling
process that removes cooling water jetted to a hot rolling steel sheet when cooling
the hot rolling steel sheet before and after rough rolling or before and after finish
10 rolling of the hot rolling process,
the water removing method comprising:
removing cooling water by jetting water-removing water to the hot rolling
steel sheet with a plurality of water removing nozzles that are aligned in a
conveyance direction of the hot rolling steel sheet on one side or both sides in a
15 width direction of the hot rolling steel sheet,
wherein a water removal single area that is an area of collision of waterremoving
water jetted from one of the water removing nozzles on the hot rolling
steel sheet has a prescribed width less than a width of the hot rolling steel sheet, and
the plurality of water removal single areas formed by the plurality of water removing
20 nozzles cover the entire area in the width direction of the hot rolling steel sheet,
one or more water removing nozzles that are placed on a lateral side of one
end in the width direction of the hot rolling steel sheet among the plurality of water
removing nozzles comprise one or more of a single far water removing nozzle and a
far water removing nozzle group,
25 the single far water removing nozzle forms a far end water removal single
area that does not include the one end but includes another end in the width direction
of the hot rolling steel sheet, and
the far water removing nozzle group comprises one or more inner water
removing nozzles and the far water removing nozzle, and one or more inner water
30 removal single areas, which the one or more inner water removing nozzles form and
which do not include either end in the width direction of the hot rolling steel sheet,
and the h r end water removal single area, which the far water removing nozzle
forms, are formed, the one or more inncr watcr removal single areas and the far water
removing nozzle being aligned in order from the one end side to the other end side
while overlapping with each other in the width direction of the hot rolling steel sheet
5 and at aligned in order from an upstream side to a downstream side without
overlapping in the conveyance direction.
Claim 6
The water removing method for steel sheet cooling water in a hot rolling
10 process according to claim 5, wherein one or more of the single far water removing
nozzle(s) or one or more of the far water removing nozzle group(s) are placed on
both sides in the width direction of the hot rolling steel sheet.
Claim 7
15 The water removing method for steel sheet cooling water in a hot rolling
process according to claim 5,
wherein, in addition to the single far water removing nozzle or the far water
removing nozzle group, a near water removing nozzle is placed on the lateral side of
the one end in the width direction of the hot rolling steel sheet,
20 the near water removing no~zlefo rms a near end water removal single area,
which is not included in either a far end water removal single area that the single far
water removing nozzle forms or a far water removal area group that the far water
removing nozzle group forms and which includes the one end in the width direction
of the hot rolling steel sheet on the upstream side in the conveyance direction of the
25 far end water removal single area or the far water removal area group, and
water removal is continuously performed by at least the single far water
removing nozzle or the far water removing nozzle group and the near water
removing nozzle from the one end to the other end in the width direction of the hot
rolling steel sheet.
30
Claim 8
The water removing method for steel sheet cooling water in a hot rolling
process according to any one of claims 5 to 7, wherein a water removing nozzle,
which is placed in the downstream side at a second or a subsequent position from the
upstream side in the conveyance direction among the plurality of water removing
5 nozzles, forms the water removal single area in a manner that, in a planar view, a far
side of a long axis of the water removal single area is inclined from the width
direction toward the downstream side in the conveyance direction.