【Invention Title】
ROLLING METHOD, CONTINUOUS CASTING ROLLING METHOD, AND
CONTINUOUS CASTING ROLLING DEVICE
5
【Technical Field】
[0001] The present disclosure relates to a rolling method, a
continuous casting rolling method, and a continuous casting
rolling device, and more particularly, to an invention for
10 preventing damage in configurations provided in a layout during
continuous casting rolling.
【Background Art】
[0002] Processes of rolling using high temperature cast slabs
solidified in continuous casting devices are currently widely
15 used due to relatively low equipment and operating costs, as
compared with existing processes.
[0003] Further, a discontinuous process in which rolling may
be carried out separately from the above-mentioned continuous
casting, while continuously using continuous casting and
20 rolling, is disclosed in Korean Patent Laid-Open Publication
No. 1990-7001437.
[0004] For example, the processes may be respectively carried
out in a continuous rolling mode in which a continuous casting
process and a rolling process are continuously performed and
25 in a discontinuous rolling mode in which the continuous casting
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process and the rolling process are discontinuously performed.
[0005] In this case, with reference to FIG. 1 illustrating an
apparatus 1’ in which continuous casting rolling may be
performed, a cast slab 2' having a predetermined thickness is
5 produced in a continuous casting device 10’, and the cast slab
2' is primarily rolled in a first rolling unit 21’. In order
to perform finish rolling in a second rolling unit 22’, a heater
40’ may heat the cast slab 2' to a temperature for rolling, in
the second rolling unit 22'. The finish-rolled cast slab 2’
10 is cut by a cutter and wound by a winding machine R to be produced
as a product.
[0006] On the other hand, in the related art, as illustrated
in FIG. 2A, a device such as the heater 40’ or the like, heating
the cast slab 2' or maintaining temperature of the cast slab
15 2', is fixedly installed on a movement line on which the cast
slab 2’ is moved, during continuous operations, and is driven
via turning on and turning off thereof to selectively heat or
maintain heating thereof, regardless of the type of the
continuous rolling mode and the discontinuous rolling mode.
20 [0007] However, as illustrated in FIG. 2B, in an initial stage
of the continuous rolling mode or in the discontinuous rolling
mode, a vertical warp or horizontal camber may occur in a front
end portion of the cast slab 2’ while the cast slab is rolled
in the first rolling unit 21’, and thus, there is present a
25 problem in which such a warp or camber collides with the heater
Page 4
40’.
[0008] The occurrence of warping at the front end portion of
the cast slab 2’ as described above may also occur at an exit
of the continuous casting device 10', depending on temperature
5 conditions and an external environment.
[0009] Thus, research into a rolling method, a continuous
casting rolling method, and a continuous casting rolling device
has been required in order to solve the problems described
above.
10
[0010] 【Disclosure】
[0011] 【Technical Problem】
[0012] An aspect according to an exemplary embodiment in the
present disclosure is to provide a rolling method, a continuous
15 casting rolling method, and a continuous casting rolling device,
in which damage, in configurations provided in layouts during
a continuous casting rolling process may be prevented, and a
yield rate may be improved via efficient operating thereof.
【Technical Solution】
20 [0013] According to an aspect of the present disclosure, a
rolling method includes reduction-rolling a cast slab being
supplied; and heating the cast slab prior to or during the
reduction-rolling, by allowing a heater to enter a travel path
of the cast slab on which the cast slab travels, immediately
Page 5
after a point of the cast slab, at which a height of the cast
slab is uniformly converged, passes through a position of the
heater in a direction of travel of the cast slab, the heater
being provided to increase or maintain a temperature of the cast
5 slab.
[0014] In the heating, when the height of the cast slab is
changed within an interval between an upper coil plate and a
lower coil plate of the heater, heating upper and lower surfaces
of the cast slab, the height of the cast slab may be determined
10 to be constantly converged.
[0015] According to an aspect of the present disclosure, a
continuous casting rolling method includes a continuous casting
operation of producing a cast slab; a rolling operation of
reduction-rolling the cast slab; and a heating operation
15 performed prior to or during the rolling operation, to heat the
cast slab by allowing a heater to enter a travel path of the
cast slab, after a front end portion of the cast slab travels,
in a continuous rolling mode in which the cast slab is provided
as a continuous body in the continuous casting operation and
20 the rolling operation, the heater being provided to increase
or maintain a temperature of the cast slab. In the heating
operation, immediately after an initial point of the cast slab,
at which a height of the cast slab in a direction perpendicular
to a direction of travel of the cast slab begins to be constant,
25 passes through a position of the heater in the direction of
Page 6
travel of the cast slab, the heater enters the travel path of
the cast slab.
[0016] The continuous casting rolling method may further
include a cutting operation of performing selective cutting of
5 the cast slab, from cutting before the rolling operation or
cutting during the rolling operation, to switch between the
continuous rolling mode, and a discontinuous rolling mode in
which the cast slab is cut before or during the rolling operation.
In this case, the heating operation may be performed in the
10 continuous rolling mode.
[0017] When a temperature of the cast slab cut to perform the
discontinuous rolling mode in the cutting operation is lower
than a temperature of the cast slab heated in the continuous
rolling mode, the heating operation may be performed in the
15 discontinuous rolling mode.
[0018] The rolling operation may be performed by a rolling mill
including a plurality of rolling stands containing upper and
lower rolling rolls, and in the heating operation, the heater
may enter the travel path of the cast slab, immediately after
20 a front end portion of the cast slab passes through an exit of
a forward rolling stand into which the front end portion of the
cast slab initially enters, among rolling stands provided
behind the heater in the direction of travel of the cast slab.
[0019] The rolling operation may include a first rolling
25 operation of primarily reduction-rolling the cast slab after
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the continuous casting operation, and a second rolling
operation of secondarily reduction-pressing the primarily
rolled cast slab after the first rolling operation. The heating
operation may be performed between the first rolling operation
5 and the second rolling operation.
[0020] In the heating operation, the heater may be driven
before the heater enters above the travel path of the cast slab,
to preheat the heater.
[0021] In the heating operation, the heater may be driven after
10 entry of the heater into the travel path of the cast slab has
been completed, to heat the cast slab.
[0022] In the heating operation, upper and lower surfaces of
the cast slab may be heated simultaneously with each other.
[0023] In the heating operation, a plurality of induction coils
15 provided in the heater may individually enter the travel path
of the cast slab, to heat the cast slab.
[0024] According to another aspect of the present disclosure,
a continuous casting rolling device includes a continuous
casting device producing a cast slab; a rolling mill including
20 a first rolling unit connected to the continuous casting device
and a second rolling unit disposed on an exit side of the first
rolling unit to be spaced apart therefrom, to reduction-roll
the cast slab; a cutter provided in at least one of a position
between the continuous casting device and the first rolling unit
25 and a position between the first rolling unit and the second
Page 8
rolling unit, in such a manner that the cast slab travels in
a continuous rolling mode in which the cast slab is continuously
provided between the continuous casting device and the rolling
mill and in a discontinuous rolling mode in which the cast slab
5 is cut before the first rolling unit or the second rolling unit;
and a heater entering the travel path of the cast slab after
a front end portion of the cast slab enters the rolling mill
in the continuous milling mode. The heater enters the travel
path of the cast slab, immediately after an initial point of
10 the cast slab, at which a height of the cast slab in a direction
perpendicular to a direction of travel of the cast slab begins
to be constant, passes through a position of the heater in the
direction of travel of the cast slab.
[0025] The second rolling unit may include a plurality of
15 rolling stands including upper and lower rolling rolls, a slab
detection sensor sensing the front end portion of the cast slab
may be provided on a rolling stand disposed on an exit side of
a forward rolling stand into which the front end portion of the
cast slab initially enters, among the plurality of rolling
20 stands, and the heater may enter the travel path of the cast
slab, immediately after the initial point of the cast slab, at
which the height of the cast slab in the direction perpendicular
to the direction of travel of the cast slab begins to be constant,
is sensed by the slab detection sensor.
25 [0026] The second rolling unit may include a plurality of
Page 9
rolling stands including upper and lower rolling rolls, and a
temperature detection sensor sensing a temperature of the cast
slab may be provided on a forward rolling stand, into which the
front end portion of the cast slab initially enters, among the
5 plurality of rolling stands.
[0027] The heater may include a plurality of coil plates
provided with an induction coil, connected to a power supply
source, to heat the cast slab, and provided in a ‘⊏’ or ‘=’
form in such a manner that upper and lower surfaces of the cast
10 slab face the coil plates; and a transfer unit connected to the
plurality of coil plates to move the induction coil in a width
direction of the cast slab.
【Advantageous Effects】
[0028] A rolling method, a continuous casting rolling method,
15 and a continuous casting rolling device according to exemplary
embodiments in the present disclosure may provide an effect of
preventing collision between a heater and a cast slab on a
continuous casting rolling line. For example, positive
attributes, in which collisions between a heater and a bent cast
20 slab may be prevented, may be provided.
[0029] As a result, the halting of production on a continuous
casting rolling line may be prevented, thereby providing stable
production of products.
[0030] Further, the heater may be specified with respect to
25 a point in time of entry of a heater onto a travel path of a
Page 10
cast slab, thereby providing an effect of improving an actual
yield rate of products.
[0031] 【Description of Drawings】
5 [0032] FIGS. 1 and 2 are views illustrating a continuous
casting rolling device according to the related art.
[0033] FIG. 3 is a side view of a continuous casting rolling
device according to an exemplary embodiment in the present
disclosure.
10 [0034] FIG. 4 is a plan view illustrating a heater in a
continuous casting rolling device according to an exemplary
embodiment in the present disclosure.
[0035] FIG. 5 is a state view illustrating operations of a
heater in a continuous casting rolling device according to an
15 exemplary embodiment in the present disclosure.
[0036] FIG. 6 is a flowchart illustrating a continuous casting
rolling method according to an exemplary embodiment in the
present disclosure.
20 【Best Mode】
[0037] Hereinafter, exemplary embodiments of the present
disclosure will be described in detail with reference to the
accompanying drawings. The disclosure may, however, be
exemplified in many different forms and should not be construed
Page 11
as being limited to the specific embodiments set forth herein,
and those skilled in the art and understanding the present
disclosure could easily propose other embodiments included in
the scope of the invention by the addition, modification, and
5 removal of components within the same scope, but those are to
be construed as being included in the scope of the invention.
[0038] In the following description, the same reference
numerals are used to designate the same or similar components
in the drawings according to respective exemplary embodiments.
10 [0039] A rolling method, a continuous casting rolling method,
and a continuous casting rolling device (1) according to an
exemplary embodiment in the present disclosure are provided to
prevent damage in configurations provided in a layout, during
continuous casting rolling.
15 [0040] For example, in the case of the rolling method, the
continuous casting rolling method and the continuous casting
rolling device 1 according to exemplary embodiments, a
collision between a cast slab 2 and the heater 40 on a continuous
casting rolling line may be prevented. In detail, positive
20 attributes in that a collision between the heater 40 and the
bent cast slab 2 may be prevented.
[0041] Thus, stopping of the continuous casting rolling line
may be prevented to stably produce a product. Further, as a
point in time in entry of the heater 40 onto a travel course
25 of the cast slab 2 is specified, an actual yield rate of products
Page 12
may be improved.
[0042] First, the continuous casting rolling device 1 will be
described in detail, and then a rolling method and a continuous
casting rolling method will be described.
5 [0043] FIG. 3 is a side view illustrating the continuous
casting rolling device 1 according to an exemplary embodiment,
and FIG. 4 is a plan view illustrating the heater 40 in the
continuous casting rolling device 1 according to an exemplary
embodiment.
10 [0044] With reference to FIGS. 3 and 4, a continuous casting
rolling device 1 according to another exemplary embodiment in
the present disclosure may include a continuous casting device
10 producing a cast slab 2; a rolling mill 20 including a first
rolling unit 21 connected to the continuous casting device 10
15 and a second rolling unit 22 disposed on an exit side of the
first rolling unit 21 to be spaced apart therefrom, to roll the
cast slab 2; a cutter 30 provided in at least one of a position
between the continuous casting device 10 and the first rolling
unit and a position between the first rolling unit 21 and the
20 second rolling unit 22, in such a manner that the cast slab 2
may travel in a continuous rolling mode in which the cast slab
2 is continuously provided between the continuous casting
device 10 and the rolling mill 20 and in a discontinuous rolling
mode in which the cast slab 2 is cut before the first rolling
25 unit 21 or the second rolling unit 22; and a heater 40 that enters
Page 13
the travel path of the cast slab 2 after a front end portion
2a of the cast slab enters the rolling mill 20 in the continuous
milling mode. In this case, the heater 40 may enter a travel
path of the cast slab 2, immediately after an initial point 2b
of the cast slab, at which a height 5 h of the cast slab 2 in a
direction z perpendicular to a direction of travel x of the cast
slab 2 begins to be constant, passes through a position of the
heater 40 in which the heater is to be located, in the direction
of travel x of the cast slab 2.
10 [0045] In addition, the second rolling unit 22 of the
continuous casting rolling device 1 according to the exemplary
embodiment may include a plurality of rolling stands 20a
including upper and lower rolling rolls. A slab detection
sensor 20b detecting the front end portion 2a of the cast slab
15 may be provided on a rolling stand 20a provided on an exit side
of a forward rolling stand 20a, among the plurality of rolling
stands 20a. The heater 40 may enter the travel path of the cast
slab 2, immediately after the initial point 2b of the cast slab,
at which the height h of the cast slab 2 in a direction z
20 perpendicular to the direction of travel x of the cast slab 2
begins to be constant, is sensed by the slab detection sensor
20b.
[0046] In addition, the second rolling unit 22 of the
continuous casting rolling device 1 according to another
25 exemplary embodiment in the present disclosure may include a
Page 14
plurality of rolling stands 20a including upper and lower
rolling rolls. In this case, a temperature detection sensor
20c sensing temperature of the cast slab 2 may be provided on
a forward rolling stand 20a, into which the front end portion
5 2a of the cast slab initially enters, among the plurality of
rolling stands 20a.
[0047] Further, the heater 40 of the continuous casting rolling
device 1 according to another exemplary embodiment in the
present disclosure may include a plurality of coil plates 41
10 provided with an induction coil 41a connected to a power supply
source 44 to heat the cast slab 2, and provided in a ‘⊏’ or
‘=’ form in such a manner that upper and lower surfaces of the
cast slab 2 face the coil plates; and a transfer unit 42 connected
to the coil plate 41 to move the induction coil 41a in a width
15 direction y of the cast slab2.
[0048] For example, in order to prevent a collision between
the front end portion 2a of the cast slab and the heater 40,
the heater 40 specified with respect to a point in time of
entering a path on which the cast slab 2 travels in a direction
20 of travel x may be provided.
[0049] In detail, a collision between the heater and the cast
slab 2 may be prevented simultaneously with improvements of an
actual yield rate of products, in that after the initial point
2b of the cast slab, at which a height h of the cast slab 2 in
25 a direction z perpendicular to the direction of travel x of the
Page 15
cast slab 2 begins to be constant, in the front end portion 2a
of the cast slab 2, passes through a position of the heater 40
in which the heater is to be located, the heater 40 may enter
a travel path of the cast slab 2 on which the cast slab 2 travels
5 in the direction of travel x.
[0050] In this case, the continuous casting device 10 may serve
to produce the cast slab 2 from molten steel using a casting
process. For example, the continuous casting device 10 may
supply molten steel from a tundish to a casting mold, and the
10 supplied molten steel may be deprived of heat to form the cast
slab 2, and the cast slab 2 may be guided and moved by a segment
roll and a pinch roll to be supplied to the rolling mill 20 to
be described later.
[0051] On the other hand, since the continuous casting device
15 10 produces the cast slab 2 depending on a solidification speed
of the molten steel, there may be a speed limit in continuously
receiving the cast slab 2 produced by the continuous casting
device 10 and reduced by the rolling mill 20 to produce the cast
slab 2.
20 [0052] On the other hand, for example, when the cast slab 2
is produced in such a manner that the cast slab 2 produced in
the continuous casting device 10 is cut by the cutter 30 to be
described later to be provided to the rolling mill 20 in a
discontinuous manner, the rolling mill 20 may rapidly produce
25 the cast slab 2 by performing a rolling operation independently
Page 16
of the production speed of the continuous casting device 10.
[0053] As described above, the process of producing the cast
slab 2 produced in the continuous casting device 10 as the cast
slab 2 using the rolling mill 20 may be classified as a continuous
5 rolling mode or a discontinuous rolling mode. The rolling
production modes as described above may be performed in
combination, or respective modes may be performed
independently.
[0054] However, in the case of the continuous rolling mode,
10 since the rolling process with respect to the cast slab 2
produced in the continuous casting device 10 at a limited speed
is performed in the rolling mill 20 to be described later, a
configuration of the heater 40 to be described below, to
supplement cooling of the cast slab 2, may also be required.
15 In addition, in the case of the discontinuous rolling mode, when
it is required to heat the cut cast-slab 2 to an extent of
temperature at which the rolling may be carried out, the cast
slab 2 may be required to be heated by the heater. 40.
[0055] In this case, when a warp or camber occurs in the front
20 end portion 2a of the cast slab, an overall process may be stopped
due to collision with the heater 40.
[0056] In order to solve this problem, the heater 40 may move
onto a travel path of the cast slab 2 at a specific point in
time, which will be described later.
25 [0057] The rolling mill 20 may serve to receive the cast slab
Page 17
2 produced in the continuous casting device 10 and
reduction-press the cast slab and thus produce the cast slab
2. To this end, the rolling mill 20 may perform pressing for
reduction with respect to the cast slab while allowing the cast
5 slab 2 to pass between the rolling rolls of the rolling stand
20a including a pair of rolling rolls. As the rolling stand
20a, a plurality of rolling stands 20a may be provided.
[0058] Further, the rolling mill 20 may be classified as the
first rolling unit 21 and the second rolling unit 22 depending
10 on a position thereof.
[0059] In this case, the first rolling unit 21 may be a rolling
mill 20 provided in connection with a rear end, an exit side,
of the continuous casting device 10, and may produce the cast
slab 2 in cooperation with the second rolling unit 22 in a
15 continuous rolling mode.
[0060] For example, in the continuous rolling mode, since the
rolling process is performed using the cast slab 2 connected
to the continuous casting device 10, if a reduction process is
suddenly performed on the cast slab, the continuous casting
20 device 10 may be affected thereby. Thus, a primarily
reduction-rolled cast slab 2 having a predetermined thickness
may be produced by the first rolling unit 21, and then, the
primarily reduction-rolled steel slab 2 may be secondarily
rolled in finish rolling, thereby producing a rolled steel
25 product.
Page 18
[0061] On the other hand, the first rolling unit 21 is not
limited to only being used in the continuous rolling mode, and
may also produce the cast slab 2 in cooperation with the second
rolling unit 22, even in the discontinuous rolling mode.
5 [0062] The first rolling unit 21 may receive the cast slab 2
produced in the continuous casting device 10, and may produce
the primarily reduction-rolled cast slab 2. In this case, since
the cast slab 2 produced and supplied by the continuous casting
device 10 may have a nonuniform temperature distribution in a
10 thickness direction of the cast slab 2, the quality of a produced
cast slab 2 may be lowered. In order to solve this problem,
the heater 40 may be provided according to an exemplary
embodiment in the present disclosure, and a description thereof
will be provided below.
15 [0063] The second rolling unit 22 may receive the primarily
reduction-rolled cast slab 2 produced by the first rolling unit
21, or may directly receive the cast slab 2 produced by the
continuous casting device 10 to produce an ultimately,
secondarily reduction-rolled cast slab 2.
20 [0064] The second rolling unit 22 described above may also
reduction-press the cast slab 2 moved between the rolling rolls
of the rolling stand 20a including a pair of rolling rolls, to
thus produce the cast slab 2. The produced cast slab 2 may be
wound on a rewinder and may then be ultimately discharged.
25 [0065] To this end, the second rolling unit 22 may be connected
Page 19
to the rear end, an exit side, of the first rolling unit 21,
and the heater 40 to be described later, to heat the cast slab
2, may be provided between the second rolling unit 22 and the
first rolling unit 21.
5 [0066] The heater 40 may serve to increase or maintain a
temperature of the cast slab 2 produced and supplied from the
continuous casting device 10 and may provide the cast slab to
the rolling mill 20. To this end, the heater 40 may be disposed
between an exit of the continuous casting device 10 and an
10 entrance of the first rolling unit 21 or between an exit of the
first rolling unit 21 and an entrance of the second rolling unit
22.
[0067] In this case, for example, when the cast slab 2 is heated
only once, since heating time is relatively short, a surface
15 of the cast slab 2 may be cooled while heat transferred to the
surface of the cast slab 2 is transferred to a central portion
of the cast slab 2. Thus, at the time at which the cast slab
2 is transferred to the rolling mill 20, the cast slab may have
a nonuniform temperature distribution in a thickness direction
20 of the cast slab 2, and since the rolling is performed on the
cast slab 2 having a nonuniform temperature distribution, the
heater 40 may include a plurality of coil plates 41 to heat the
cast slab 2.
[0068] For example, in order to improve the temperature of the
25 cast slab 2 in the thickness direction of the cast slab 2 as
Page 20
well as the central portion thereof while a temperature of an
outer surface thereof is limited, the heater 40 may repeatedly
perform heating by distributing a plurality of the induction
coils 41 in the direction of travel x of the cast slab 2.
5 [0069] The heater 40 may further include a heat retaining unit
to extend a temperature maintenance time of the cast slab 2
having a uniform temperature region formed by the heater 40.
For example, the heat retaining unit may be provided to cover
at least one surface of the cast slab 2 to maintain the
10 temperature of the cast slab 2.
[0070] To this end, the heat retaining unit may enclose the
entirety of a circumference of the cast slab 2 to efficiently
maintain heat thereof. In order to increase a heat keeping rate,
heat maintenance gas for heat maintenance may also be provided.
15 [0071] The heat retaining unit may be formed using refractory
bricks formed of a ceramic-based material, or the like.
[0072] The heat retaining unit may also be provided as a holding
furnace. For example, the heater 40 may be provided inside the
heat retaining unit, a holding furnace.
20 [0073] In detail, the heater 40 may include a coil plate 41,
a transfer unit 42, a controller 43, and the like.
[0074] The coil plate 41 may be configured to perform induction
heating, the transfer unit 42 may be configured to set a position
of the coil plate 41, and the controller 43 may be configured
25 to adjust a degree of heating of the coil plate 41, a driving
Page 21
degree of the transfer unit 42, and the like.
[0075] In this case, the coil plate 41 may include the induction
coil 41a for heating using induction electromotive force. For
example, when the induction coil 41a is used for heating, a
5 temperature to heat the cast slab 2 may be adjusted. Thus, a
heating level may be set differently according to a position
in which the heater 40 is provided, and the heating level may
also be gradually increased.
[0076] However, when the induction coil 41a is used, a greater
10 amount of magnetic flux may be present in an outer surface
portion of the cast slab 2 adjacent to the induction coil 41a,
than in a central portion of the cast slab 2, in the thickness
direction, and thus, a relatively large amount of heat may be
generated and may be heated more.
15 [0077] In order to adjust the amount of heating of the induction
coil 41a, the induction coil 41a may be connected to the power
supply source 44, and the controller 43 for controlling thereof
may be provided.
[0078] The adjustment of the heating amount of the induction
20 coil 41a as described above may include a function of turning
the induction coil 41a on and off. For example, the turning
on and off of the induction coil 41a may be controlled by
controlling whether the power supply source 44 supplies power.
[0079] The coil plate 41 may be provided on both upper and lower
25 surfaces of the cast slab 2, and may also have a ‘⊏’ form for
Page 22
structural stability in such a manner that a side of the cast
slab 2 may be inserted thereinto.
[0080] For example, the coil plate 41 may be composed of an
upper coil plate 41b facing an upper surface of the cast slab
5 2, and a lower coil plate 41c facing a lower surface of the cast
slab 2, and a connecting plate connecting the upper coil plate
41b and the lower coil plate 41c may be provided.
[0081] However, an exemplary embodiment in the present
disclosure is not limited thereto, and the coil plate 41 may
10 also be provided in a ‘=’ form in a structure in which the upper
and lower surfaces of the cast slab 2 are heated, or the like.
In this case, the coil plate 41 may only be composed of the upper
coil plate 41b and the lower coil plate 41c.
[0082] The transfer unit 42 may move the coil plate 41 including
15 the induction coil 41a in a width direction y of the cast slab
2, in such a manner that the induction coil 41a may be moved
onto a travel path of the cast slab 2 or released therefrom.
[0083] Thus, in order to heat the cast slab 2, the induction
coil 41a may be configured to move to the upper surface or the
20 lower surface of the cast slab 2. In this case, during
non-heating, the heater 40 may be removed from the travel path
of the cast slab 2, to prevent the occurrence of a problem such
as a collision between the heater and the cast slab 2, or the
like.
25 [0084] In this case, by the transfer unit 42, the coil plate
Page 23
41 may enter the path on which the cast slab 2 travels, after
the front end portion 2a of the cast slab has passed. In detail,
in the front end portion 2a of the cast slab, the initial point
2b of the cast slab, at which the height h of the cast slab 2
in a direction 5 z perpendicular to the direction of travel x of
the cast slab 2 begins to be constant, passes, the coil plate
may enter a travel path of the cast slab 2 to be located in the
direction of travel x of the cast slab 2.
[0085] In addition, the controller 43 may perform controlling
10 such that the induction coil 41 may move to the travel path of
the cast slab 2 after the cast slab 2 is detected by the slab
detection sensor 20b provided on the rolling mill 20.
[0086] For example, the first rolling unit 21 or the second
rolling unit 22 may include a plurality of rolling stands 20a
15 including upper and lower rolling rolls. The slab detection
sensor 20b detecting the front end portion 2a of the cast slab
may be provided on a rolling stand 20a provided on an exit side
of a forward rolling stand 20a in which the front end portion
2a of the cast slab initially enters, among the plurality of
20 rolling stands 20a.
[0087] In detail, in the case of a group of the plurality of
rolling stands 20a constituting the first rolling unit 21 or
the second rolling unit 22, the slab detection sensor 20b may
be provided on a second rolling stand 20a. Since the detection
25 of the cast slab 2 by the slab detection sensor 20b may indicate
Page 24
that the front end portion 2b of the cast slab 2 has passed a
position of the heater 40, when the heater 40 enters the travel
path of the cast slab 2, a collision between the heater and the
cast slab 2 may be prevented.
5 [0088] In addition, the slab detection sensor 20b may be
installed in a position corresponding to a height h2 of the cast
slab 2 in normal operations, which is the height h2 of the cast
slab 2 in a direction z perpendicular to the direction of travel
x, to detect an initial point 2b of the cast slab, at which the
10 height h of the cast slab 2 in the direction of travel x of the
cast slab 2 begins to be constant.
[0089] In this case, the slab detection sensor 20b may be an
infrared sensor directly detecting whether the cast slab 2 has
passed or not, or the like, and may also be provided as a load
15 cell installed in the rolling stand 20a, a sensor detecting a
moment when a material is caught by the rolling mill using a
hydraulic pressure conversion device, or the like.
[0090] Further, the controller 43 may be connected to the
temperature detection sensor 20c provided on a forward rolling
20 stand 20a provided as a first rolling stand 20a, among the
plurality of rolling stands 20a constituting the first rolling
unit 21 or the second rolling unit 22, to perform controlling,
such that the coil plate 41 may enter the travel path of the
cast slab 2 according to a sensed temperature.
25 [0091] For example, generally in the discontinuous rolling
Page 25
mode, since rapid rolling may be performed, the use of the heater
40 may not be required. However, in the case in which a
relatively high temperature condition is required in an
abnormal state or rolling of a high strength steel, since the
5 cast slab 2 may be required to be heated, even in the case of
the discontinuous rolling mode, the controller 43 may be
connected to the temperature detection sensor 20c to determine
the entry of the coil plate 41.
[0092] Thus, in addition to the positive attributes of
10 preventing a collision between the cast slab 2 and the coil plate
41, as the coil plate 41 may be advanced into the travel path
of the cast slab 2 at a point in time suitable therefor, the
cast slab 2 may be prevented from being wasted.
[0093] To this end, the transfer unit 42 may include a movement
15 plate 42b on which the coil plate 41 is provided, and a motor
42a driving the movement plate 42b.
[0094] The movement plate 42b may be connected to the motor
42a by a chain, and the chain may be moved by receiving driving
force by a sprocket provided on the motor 42a. However, the
20 driving force moving the movement plate 42b is not limited to
that provided by the motor 42a, and the driving force may be
obtained by a hydraulic or pneumatic cylinder.
[0095] Further, in order for the movement plate 42b to be
provided on the travel path of the cast slab 2, a wheel may be
25 coupled to a lower surface thereof.
Page 26
[0096] On the other hand, a plurality of the movement plates
42b may be spaced apart from each other to support and move the
respective coil plate 41. A movement roll supporting the cast
slab 2 may be provided between the movement plates 42b spaced
5 apart from each other.
[0097] The cutter 30 may serve to cut a portion of the cast
slab 2, and may be connected to a drawer removing the cut slab
2. In this case, the cutter 30 may be disposed in at least one
of a position between an exit of the continuous casting device
10 10 and an entrance of the first rolling unit 21 and a position
between an exit of the first rolling unit 21 and the second
rolling unit 22. For example, in the case in which the heater
40 is provided between the exit of the continuous casting device
10 and the entrance of the first rolling unit 21 and between
15 the exit of the first rolling unit 21 and the second rolling
unit 22, the cutter 30 may be disposed at the entrances of the
heaters 40.
[0098] FIG. 5 is an operational state view illustrating the
heater 40 in the continuous casting rolling device 1 according
20 to an exemplary embodiment in the present disclosure, and FIG.
6 is a flowchart illustrating a continuous casting rolling
method according to an exemplary embodiment in the present
disclosure.
[0099] With reference to FIGS. 5 and 6, a rolling method
25 according to an exemplary embodiment in the present disclosure
Page 27
may include a rolling operation of reduction rolling a supplied
cast slab 2, and a heating operation performed prior to or during
the rolling operation, to heat the cast slab 2 by allowing a
heater 40 to enter a travel path of the cast slab 2 on which
the cast slab travels, 5 immediately after a point 2b of the cast
slab 2, with which a height h of the cast slab 2 uniformly
converges, passes through a position of the heater 40 in which
the cast slab 2 is to be located in a direction of travel x of
the cast slab 2, the heater 40 being provided to increase or
10 maintain temperature of the cast slab 2.
[00100] In addition, in the heating operation of the rolling
method according to the exemplary embodiment, when the height
h of the cast slab 2 is changed within a range of a gap between
an upper coil plate 41b and a lower coil plate 41c of the heater
15 40 heating upper and lower surfaces of the cast slab 2, it may
be determined that the height h of the cast slab 2 is constantly
converged.
[00101] Further, a continuous casting rolling method
according to another exemplary embodiment in the present
20 disclosure may include a continuous casting operation of
producing a cast slab 2, a rolling operation of
reduction-rolling the cast slab 2, and a heating operation
performed prior to or during the rolling operation, to heat the
cast slab 2 by allowing the heater 40 to enter a travel path
25 of the cast slab 2 on which the cast slab travels, after a front
Page 28
end portion 2b of the cast slab 2 travels, in a continuous rolling
mode in which the cast slab 2 is provided as a continuous body
in the continuous casting operation and the rolling operation,
the heater 40 being provided to increase or maintain temperature
of the 5 cast slab 2. In the heating operation, immediately after
an initial point 2b of the cast slab, at which a height h of
the cast slab 2 in a direction z perpendicular to the direction
of travel x of the cast slab 2 begins to be constant, passes
through a position of the heater 40 in a direction of travel
10 x of the cast slab 2 in which the cast slab travels, the heater
40 may enter the travel path of the cast slab 2.
[00102] For example, in order to prevent a collision between
the heater 40 to heat the cast slab 2 and the front end portion
2a of the cast slab 2, the heater 40, specified with respect
15 to a point in time at which the heater enters a travel path of
the cast slab 2 on which the cast slab travels in a direction
of travel x, may be provided.
[00103] In detail, a collision between the heater and the
cast slab 2 may be prevented simultaneously with improvements
20 of an actual yield rate of products, by including an operation
in which, after an initial point 2b of the cast slab, at which
a height h of the cast slab 2 in a direction z perpendicular
to the direction of travel x of the cast slab 2 begins to be
constant, in the front end portion 2a of the cast slab, passes
25 through a position of the heater, the heater 40 may enter a travel
Page 29
path of the cast slab 2 on which the cast slab travels in the
direction of travel x.
[00104] In this case, the initial point 2b of the cast slab,
at which the height h of the cast slab 2 in the direction z
5 perpendicular to the direction of travel x of the cast slab 2
begins to be constant, may be a portion in which a vertical warp
or a horizontal camber occurring in the front end portion 2a
of the cast slab ends.
[00105] The continuous casting operation may be an operation
10 of producing the cast slab 2, in which molten steel is solidified
in a casting mold to be formed into the cast slab 2 and discharged
therefrom. To this end, the molten steel may be supplied to
the casting mold from a tundish of the continuous casting device
10, and the supplied molten steel may be stripped of heat to
15 form the cast slab 2. The cast slab 2 may be guided by a segment
roll and a pinch roll, and then, may be transferred to a
subsequent operation.
[00106] The rolling operation may be an operation of
reduction-rolling the cast slab 2 to produce a steel plate
20 product. For example, in the rolling operation, the cast slab
2 produced in the continuous casting operation may be received
and reduction-rolled to produce a steel plate product.
Alternatively, the cast slab 2 produced separately from the
continuous casting operation may be received to produce a steel
25 plate product.
Page 30
[00107] In this case, the rolling operation may include a
plurality of operations, for example, a first rolling operation
and a second rolling operation. In the first rolling operation,
a primarily reduction-rolled cast slab 2, produced from the
5 first supplied cast slab 2, to have a thickness greater than
that of an ultimately produced product, while having the
thickness less than that of the first supplied cast slab 2, may
be formed. In the second rolling operation, the cast slab 2
primarily reduction-rolled in the first rolling operation may
10 be secondarily reduction-rolled to have a thickness of an
ultimate product.
[00108] In detail, the rolling mill 20 may be performed by
the rolling mill 20 including a plurality of rolling stands 20a
containing a pair of upper and lower rolling rolls. A heating
15 operation to be described below may be performed when the front
end portion 2a of the cast slab enters a forward rolling stand
20a, into which the front end portion 2a of the cast slab
initially enters, among the plurality of rolling stands 20a.
[00109] To this end, the rolling mill 20 performing the
20 rolling operation may be provided with a slab detection sensor
20b, a temperature detection sensor 20c, and the like disposed
thereon.
[00110] The heating operation may be an operation of heating
the cast slab 2 in the case in which a temperature of the cast
25 slab 2 does not reach a temperature at which the rolling
Page 31
operation may be carried out.
[00111] In this case, the heating operation may be carried
out before the rolling operation or during the rolling operation.
In detail, the heating operation may be performed before the
5 first rolling operation or between the first rolling operation
and the second rolling operation, in the rolling operation.
[00112] In detail, the heating operation may be performed
on a portion of the cast slab 2 provided after advancement of
the front end portion 2a of the cast slab, which is to prevent
10 a collision between the heater 40 heating the cast slab 2 and
the cast slab 2.
[00113] For example, in the case of the cast slab 2, the
vertical warp or the horizontal camber may generally occur in
the front end portion (2a) thereof after the continuous casting
15 operation or the first rolling operation. Thus, the heating
operation may be performed to heat the cast slab 2 while
preventing a collision between the heater 40 and the front end
portion 2a of the cast slab in which warp has occurred.
[00114] Since warping of the front end portion 2b of the
20 cast slab 2 generally occurs due to residual stress of the cast
slab 2 due to pressing in the first rolling operation, the
heating operation specified with respect to a point in time at
which the heater 40 enters may be carried out between the first
rolling operation and the second rolling operation.
25 [00115] For example, the rolling operation in a continuous
Page 32
casting rolling method according to another exemplary
embodiment in the present disclosure may include a first rolling
operation of primarily reduction-rolling the cast slab 2 after
the continuous casting operation, and a second rolling
5 operation of secondarily reduction-pressing the primarily
rolled cast slab 2 after the first rolling operation. Thus,
the heating operation may be performed between the first rolling
operation and the second rolling operation.
[00116] The heating operation may be performed in a
10 continuous rolling mode in which the cast slab 2 is provided
as a continuous body in the continuous casting operation and
the rolling operation and in a discontinuous rolling mode in
which the cast slab 2 is cut before or during the rolling
operation.
15 [00117] In detail, the heating operation may not be
performed in the discontinuous rolling mode, but may only be
performed in the continuous rolling mode, since the cast slab
2 rapidly passes through the rolling operation to be produced
as a product in the discontinuous rolling mode such that there
20 is little occurrence of a cooling problem of the cast slab 2.
[00118] For example, the continuous casting rolling method
according to the exemplary embodiment may further include a
cutting operation of performing selective cutting of the cast
slab 2, from cutting before the rolling operation and cutting
25 during the rolling operation, to switch between the continuous
Page 33
rolling mode, and the discontinuous rolling mode in which the
cast slab 2 is cut before or during the rolling operation. In
this case, the heating operation may be carried out in the
continuous rolling mode.
5 [00119] However, performing the heating operation is not
necessarily included in the discontinuous rolling mode. For
example, even in the discontinuous rolling mode, a level of
temperature of the cast slab 2 may be insufficient to perform
the rolling operation thereon. In this case, the heating
10 operation may be performed.
[00120] In detail, in the case of the heating operation of
the continuous casting rolling method according to the
exemplary embodiment, for example, when a temperature of the
cast slab 2 cut to perform the discontinuous rolling mode in
15 the cutting operation is lower than a temperature of the cast
slab 2 heated in the continuous rolling mode, the heating
operation may be performed in the discontinuous rolling mode.
[00121] To this end, the temperature detection sensor 20c
described above may be provided on a forward rolling stand 20a,
20 into which the front end portion 2a of the cast slab initially
enters, among the plurality of rolling stands 20a of the rolling
mill 20, to sense temperature of the cast slab 2. In this case,
in the case in which the cast slab 2 travels at a temperature
lower than a required temperature, the heater 40 may enter the
25 travel path of the cast slab 2 to heat the cast slab 2.
Page 34
[00122] In detail, in this case, the heater 40 enters an
upper portion of the cast slab 2 after the front end portion
2a of the cast slab enters the rolling stand 20a. Thus, after
the initial point 2b of the cast slab, at which the height h
of the cast slab 5 2 in a direction z perpendicular to the direction
of travel x of the cast slab 2 begins to be constant, passes
through a position of the heater, the heater 40 may be provided
on the cast slab 2, such that wastage of the cast slab 2 may
be significantly reduced while preventing a collision between
10 the heater 40 and the cast slab 2.
[00123] In other words, even when the front end portion 2a
of the cast slab 2 is warped, a height h2 of the portions of
the cast slab after the bent front end portion 2a thereof may
be constantly converged, and may not have a collision with the
15 heater 40. Thus, the heater 40 may enter the travel path of
the cast slab 2 after the height h, h of the cast slab 2 has
converged.
[00124] For example, portions of the cast slab 2 after the
point 2b thereof, in which a height (h)(h2) after a highest
20 height (h)(h1) of the bent front end portion 2a of the cast slab
2 becomes constant, have no risk of collision with the heater
40, and thus, the heater 40 may enter the travel path of the
cast slab 2 after the point 2b has passed, thereby improving
an actual yield rate.
25 [00125] In this case, the height h of the cast slab 2 may
Page 35
be determined according to any criterion as long as it is a height
according to a criterion determinable on the same basis in all
of portions of the cast slab 2. The criterion illustrated in
FIG. 5 is set based on a lower surface of the lower coil plate
5 41c.
[00126] In addition, in order to determine whether the
height h of the cast slab 2 is constantly converged or not, it
may be determined that when the height h of the cast slab 2 is
changed within an interval between the upper coil plate 41b and
10 the lower coil plate 41c of the heater 40, the height is
converged.
[00127] The convergence criterion as described above is
provided based on a range in which the cast slab 2 may be inserted
between the upper coil plate 41b and the lower coil plate 41c
15 without collision.
[00128] Further, a point in time at which the heater 40
enters the travel path of the cast slab 2 in the heating operation
may be determined, based on whether the front end portion 2a
of the cast slab enters the rolling stand 20a.
20 [00129] For example, the rolling operation of the continuous
casting rolling method according to the exemplary embodiment
may be performed by the rolling mill 20 including a plurality
of rolling stands 20a containing upper and lower rolling rolls.
Further, in the heating operation, immediately after the front
25 end portion 2a of the cast slab 2 passes through an exit of the
Page 36
forward rolling stand 20a in which the front end portion 2a of
the cast slab initially enters, among the rolling stands 20a
provided behind the heater 40 in the direction of travel x of
the cast slab 2, the heater 40 may enter a travel path of the
5 cast slab 2.
[00130] In detail, when the heating operation is performed
before the first rolling operation, immediately after the front
end portion 2a of the cast slab enters a first rolling stand
20a provided in a foremost position in a group of the rolling
10 stands 20a included in the first rolling unit 21, and is then
discharged through an exit thereof, the heater 40 may enter
above the cast slab 2.
[00131] The discharge of the front end portion 2a of the
cast slab through the exit of the first rolling stand 20a as
15 described above may be detected by the fore-described slab
detection sensor 20b.
[00132] A driving point in time of the heater 40 may also
be specified, in which exemplary embodiments may be varied
depending on rapid heating of the cast slab 2 and uniform heating
20 of the cast slab 2.
[00133] For example, in order to rapidly raise the
temperature of the cast slab 2, the heating operation of the
continuous casting rolling method according to the exemplary
embodiment may be performed to drive the heater 40 before the
25 heater 40 enters above the travel path of the cast slab 2, to
Page 37
preheat the heater 40.
[00134] In this case, since the heater 40 is preheated before
entering above the cast slab 2, the cast slab 2 may be heated
while the heater starts to enter above the cast slab 2.
5 [00135] In other words, the cast slab 2 starts to be heated
from one side of the cast slab 2 into which the heater 40 enters,
and thus, the cast slab 2 may be rapidly heated.
[00136] On the other hand, in order to raise the temperature
of the cast slab 2 uniformly, after the entry of the heater 40
10 into the travel path of the cast slab 2 has been completed, the
heating operation of the continuous casting rolling method
according to the exemplary embodiment may be performed to drive
the heater 40 and heat the cast strip 2.
[00137] Further, the heating operation of the continuous
15 casting rolling method according to another exemplary
embodiment may be performed to heat upper and lower surfaces
of the cast slab 2 simultaneously.
[00138] In detail, as the heater 40 may start to be driven
and heated after the heater 40 has completely entered the travel
20 path of the cast slab 2, heating may be started at the same point
in time in a width direction y of the cast slab 2, and thus,
the cast slab 2 having a uniform temperature distribution may
be provided.
[00139] In addition, by simultaneously heating the upper
25 and lower surfaces of the cast slab 2, uniform heating of the
Page 38
cast slab 2 in a thickness direction z may also be performed.
[00140] In addition, in the heating operation, as heating
is performed by a plurality of heaters 40 in such a manner that
a temperature of heating the cast slab 2 may be set differently
5 according to a position of the cast slab 2 on which the cast
slab travels in the direction of travel x, the cast slab 2 may
have a uniform temperature in the thickness direction of the
cast slab.
[00141] For example, in the heating operation of the
10 continuous casting rolling method according to another
exemplary embodiment, a plurality of coil plates 41 provided
in the heater 40 may individually enter the travel path of the
cast slab 2, to heat the cast slab 2.
[00142] As described above, by heating the cast slab 2 with
15 the plurality of coil plates 41 having different positions on
the travel path of the cast slab 2 in the heating operation,
a uniform temperature distribution of the cast slab 2 in the
thickness direction may be formed, which is described above.

【WE CLAIM:】
【Claim 1】
5 A rolling method, comprising:
reduction-rolling a cast slab being supplied; and
heating the cast slab prior to or during the
reduction-rolling, by allowing a heater to enter a travel path
of the cast slab on which the cast slab travels, immediately
10 after a point of the cast slab, at which a height of the cast
slab is uniformly converged, passes through a position of the
heater in a direction of travel of the cast slab, the heater
being provided to increase or maintain a temperature of the cast
slab.
15
【Claim 2】
The rolling method of claim 1, wherein in the heating,
when the height of the cast slab is changed within an interval
between an upper coil plate and a lower coil plate of the heater,
20 heating upper and lower surfaces of the cast slab, the height
of the cast slab is determined to be constantly converged.
【Claim 3】
A continuous casting rolling method, comprising:
25 a continuous casting operation of producing a cast slab;
Page 40
a rolling operation of reduction-rolling the cast slab;
and
a heating operation performed prior to or during the
rolling operation, to heat the cast slab by allowing a heater
to enter a travel path 5 of the cast slab, after a front end portion
of the cast slab travels, in a continuous rolling mode in which
the cast slab is provided as a continuous body in the continuous
casting operation and the rolling operation, the heater being
provided to increase or maintain a temperature of the cast slab,
10 wherein in the heating operation, immediately after an
initial point of the cast slab, at which a height of the cast
slab in a direction perpendicular to a direction of travel of
the cast slab begins to be constant, passes through a position
of the heater in the direction of travel of the cast slab, the
15 heater enters the travel path of the cast slab.
【Claim 4】
The continuous casting rolling method of claim 3, further
comprising a cutting operation of performing selective cutting
20 of the cast slab, from cutting before the rolling operation or
cutting during the rolling operation, to switch between the
continuous rolling mode, and a discontinuous rolling mode in
which the cast slab is cut before or during the rolling
operation,
25 wherein the heating operation is performed in the
Page 41
continuous rolling mode.
【Claim 5】
The continuous casting rolling method of claim 4, wherein
5 when a temperature of the cast slab cut to perform the
discontinuous rolling mode in the cutting operation is lower
than a temperature of the cast slab heated in the continuous
rolling mode, the heating operation is performed in the
discontinuous rolling mode.
10
【Claim 6】
The continuous casting rolling method of claim 3, wherein
the rolling operation is performed by a rolling mill including
a plurality of rolling stands containing upper and lower rolling
15 rolls, and
in the heating operation, the heater enters the travel
path of the cast slab, immediately after a front end portion
of the cast slab passes through an exit of a forward rolling
stand into which the front end portion of the cast slab initially
20 enters, among rolling stands provided behind the heater in the
direction of travel of the cast slab.
【Claim 7】
The continuous casting rolling method of claim 3, wherein
25 the rolling operation comprises a first rolling operation of
Page 42
primarily reduction-rolling the cast slab after the continuous
casting operation, and a second rolling operation of
secondarily reduction-pressing the primarily rolled cast slab
after the first rolling operation,
5 wherein the heating operation is performed between the
first rolling operation and the second rolling operation.
【Claim 8】
The continuous casting rolling method of claim 3, wherein
10 in the heating operation, the heater is driven before the heater
enters above the travel path of the cast slab, to preheat the
heater.
【Claim 9】
15 The continuous casting rolling method of claim 3, wherein
in the heating operation, the heater is driven after entry of
the heater into the travel path of the cast slab has been
completed, to heat the cast slab.
20 【Claim 10】
The continuous casting rolling method of claim 9, wherein
in the heating operation, upper and lower surfaces of the cast
slab are heated simultaneously with each other.
25 【Claim 11】
Page 43
The continuous casting rolling method of claim 3, wherein
in the heating operation, a plurality of induction coils
provided in the heater individually enter the travel path of
the cast slab, to heat the cast slab.
5
【Claim 12】
A continuous casting rolling device comprising:
a continuous casting device producing a cast slab;
a rolling mill including a first rolling unit connected
10 to the continuous casting device and a second rolling unit
disposed on an exit side of the first rolling unit to be spaced
apart therefrom, to reduction-roll the cast slab;
a cutter provided in at least one of a position between
the continuous casting device and the first rolling unit and
15 a position between the first rolling unit and the second rolling
unit, in such a manner that the cast slab travels in a continuous
rolling mode in which the cast slab is continuously provided
between the continuous casting device and the rolling mill and
in a discontinuous rolling mode in which the cast slab is cut
20 before the first rolling unit or the second rolling unit; and
a heater entering the travel path of the cast slab after
a front end portion of the cast slab enters the rolling mill
in the continuous milling mode,
wherein the heater enters the travel path of the cast
25 slab, immediately after an initial point of the cast slab, at
Page 44
which a height of the cast slab in a direction perpendicular
to a direction of travel of the cast slab begins to be constant,
passes through a position of the heater in the direction of
travel of the cast slab.
5
【Claim 13】
The continuous casting rolling device of claim 12, wherein
the second rolling unit comprises a plurality of rolling stands
including upper and lower rolling rolls,
10 a slab detection sensor sensing the front end portion of
the cast slab is provided on a rolling stand disposed on an exit
side of a forward rolling stand into which the front end portion
of the cast slab initially enters, among the plurality of
rolling stands, and
15 the heater enters the travel path of the cast slab,
immediately after the initial point of the cast slab, at which
the height of the cast slab in the direction perpendicular to
the direction of travel of the cast slab begins to be constant,
is sensed by the slab detection sensor.
20
【Claim 14】
The continuous casting rolling device of claim 12, wherein
the second rolling unit comprises a plurality of rolling stands
including upper and lower rolling rolls, and
25 a temperature detection sensor sensing a temperature of
Page 45
the cast slab is provided on a forward rolling stand, into which
the front end portion of the cast slab initially enters, among
the plurality of rolling stands.
5 【Claim 15】
The continuous casting rolling device of claim 12, wherein
the heater comprises:
a plurality of coil plates provided with an induction coil,
connected to a power supply source, to heat the cast slab, and
10 provided in a ‘⊏’ or ‘=’ form in such a manner that upper and
lower surfaces of the cast slab face the coil plates; and
a transfer unit connected to the plurality of coil plates
to move the induction coil in a width direction of the cast slab.