【DESCRIPTION】
【Invention Title】
CONTINUOUS CASTING AND ROLLING APPARATUS AND METHOD
【Technical Field】
The present invention relates to a continuous casting
and rolling apparatus and method, and more particularly, to
an invention capable of performing a heating operation and a
removal operation on a steel sheet for rolling.
【Background Art】
A process of performing rolling using a high
temperature solidified cast part in a continuous casting
device is currently widely used, due to equipment costs and
operating costs thereof being more inexpensive than
conventional processes.
In addition to the process of continuously performing
casting and rolling, a batch process capable of performing
rolling separately from the above-mentioned continuous
casting can also be performed, which is described in detail
in Korean Laid-open Patent Publication No. 2008-0044897.
Meanwhile, as illustrated in FIG. 1, it is possible to
provide a remover 320’ for cutting and removing a defective
steel sheet, and a heater 310’ for heating a steel sheet 2’
before transport thereof to a hot roller 200’ for rolling.
That is, conventionally, a remover (push & piler) 320”
for cutting the steel sheet 2’ produced in the continuous
3
casting device 100’ or the steel sheet 2’ passing through a
first rolling section 210’ at a fixed length and for
laminating the steel sheet 2’ to the outside of a transport
line, and a heater 310’ for heating or heat-insulating the
steel sheet 2’ have been installed in different locations in
a transport direction x of the steel sheet 2’, respectively.
Further, a layout of a transport path has been formed
in which, regardless of being in the endless rolling mode or
the batch rolling mode, at least one of a holding furnace
(HF) and the heater 310’ has been installed at a rear end of
the continuous casting device 100’, and the steel sheet 2’
has been provided to the second rolling section 220’ via
another heater 310’ installed at a rear end of the first
rolling section 210’ provided after that.
However, the shorter the distance of the layout from
the continuous casting device 100’ to the second rolling
section 220 is, the more advantageous it is, since the
temperature loss of the steel sheet 2’ during rolling is
less. Because the remover 320’ and the heater 310’ may be
located at different locations on the transport path of the
steel sheet 2’, the layout has become elongated by an amount
equal to the arrangement length of the remover 320 or the
heater 310’, and there has been a problem of an increase in
temperature.
That is, in order to be able to perform the endless
rolling and the batch rolling at the same time, there is a
4
need for a space in which the steel sheet (slab) cut to a
length capable of producing a single rolled coil in front of
the first rolling section 210’ can be disposed. Although a
heater 310’ for compensating for a drop in temperature and a
remover 320’ for cutting and piling up the steel sheet 2’
have been required in the space, each of the heater 310’ and
the remover 320’ is fixed at a different location on the
transport path of the steel sheet 2’, which has made the
layout longer.
In addition, since the heater 310’ for heating or
insulating for finish rolling and the remover 320’ for
removing a defective steel sheet 2’ which may be generated
in the first rolling section 210’ are also required to be
installed between the first rolling section 210’ and the
second rolling section 220’, the layout for the rolling is
further elongated, and the temperature loss may further
increase.
Meanwhile, since an output side steel sheet 2’ of the
first rolling section 210’ may be vertically bent (warped)
or horizontally bent (cambered) depending on the temperature
conditions, there has also been a problem of a risk of
damaging the heater 310’ or the remover 320’ installed on
the output side of the first rolling section 210’.
Accordingly, there has been a need for a research into
continuous casting and rolling apparatuses and methods for
solving the aforementioned problems.
5
【Disclosure】
【Technical Problem】
An aspect of the present invention provides a
continuous casting and rolling apparatus and method capable
of performing an efficient continuous casting and rolling
process, by reducing a movement path of the steel sheet
produced in the continuous casting device to reduce the
temperature loss in a rolling procedure.
【Technical Solution】
According to an aspect of the present invention, there
is provided a continuous casting and rolling apparatus that
includes a continuous casting device producing a steel
sheet; a hot roller provided to be linked to the continuous
casting device to receive the steel sheet; and a push-heat
unit linked to at least one of the continuous casting device
and the hot roller and is provided to selectively perform
one of a heating operation and a removal operation on some
of the steel sheet.
Further, the push-heat unit of the continuous casting
and rolling apparatus according to an aspect of the present
invention may include a heater provided on one side of the
steel sheet in a widthwise direction to move from one side
to the other side of the steel sheet in the widthwise
direction so as to heat the steel sheet, and a remover
provided on the other side of the steel sheet in the
6
widthwise direction to move from the other side to one side
of the steel sheet in the widthwise direction so as to
remove the cut steel sheet that is cut by a cutter located
at a rear end of a first rolling section linked to a rear
end of the continuous casting device.
Further, the push-heat unit of the continuous casting
and rolling apparatus according to an aspect of the present
invention may provide the heater and the remover to face
each other on both sides of the same position in a transport
direction of the steel sheet.
Further, the heater of the continuous casting and
rolling apparatus according to an aspect of the present
invention may include a coil section provided by being
connected to a power supply unit to control a heating
temperature, and a coil transport section that moves the
coil section of the steel sheet in the widthwise direction.
Further, the coil section of the continuous casting and
rolling apparatus according to an aspect of the present
invention includes a core provided in a “U” shape to heat a
top and a bottom of the steel sheet, and a coil which is
provided by being wound around the core.
Further, the remover of the continuous casting and
rolling apparatus according to an aspect of the present
invention may include a support section provided to support
the cut steel sheet in contact with the bottom of the cut
steel sheet, a support vertical transport section for
7
vertically moving the support section, and a horizontal
transport section for moving the support section of the
steel sheet in the widthwise direction.
Furthermore, the hot roller of the continuous casting
and rolling apparatus according to an aspect of the present
invention includes a first rolling section provided to be
connected to the rear end of the continuous casting device,
and a second rolling section provided to be connected to the
rear end of the first rolling section, and the push-heat
unit may be provided in at least one of a portion between
the rear end of the continuous casting device and a front
end of the first rolling section, and a portion between the
rear end of the first rolling section and a front end of the
second rolling section.
Further, according to another aspect of the present
invention, there is provided a continuous casting and
rolling method that includes a continuous casting step of
producing a steel sheet; a rolling step of pressing the
steel sheet down; and a selectively performed step of
selectively determining whether to perform one of a heating
operation and a removal operation on some of the steel sheet,
at the same position on a transport path of the steel sheet.
Further, the selectively performed step of the
continuous casting and rolling method according to another
aspect of the present invention may selectively activate one
of a heating step of heating a portion of the steel sheet, a
8
removal step of removing the cut steel sheet cut in the
transport direction of the steel sheet, and a standby step
of not performing the heating step and the removal step.
Further, the rolling step of the continuous casting and
rolling method according to another aspect of the present
invention may include a first rolling step, and a second
rolling step performed after the first rolling step, wherein
the selectively performed step may be performed prior to at
least one of the first rolling step and the second rolling
step.
【Advantageous Effects】
According to the continuous casting and rolling
apparatus and method of an aspect of the present invention,
the heating operation of the steel sheet and the removal
operation of some of the steel sheet may be selectively
performed, in the same position on the transport path of the
steel sheet.
Thereby, since it is possible to reduce the length of
the layout of the continuous casting and rolling process,
heat loss of the steel sheet during the continuous casting
and rolling process may be reduced.
Therefore, the process may be efficiently performed, by
reducing the consumption of energy required for the
continuous casting and rolling process.
Meanwhile, by adjusting the provision of the heater for
heating the steel sheet or the remover for performing the
9
removal operation on the transport path of the steel sheet,
the steel sheet may be prevented from deviating from the
path due to bending or the like to collide with the heater
or the remover.
【Description of Drawings】
FIG. 1 is a diagram illustrating a continuous casting
and rolling apparatus according to the prior art.
FIG. 2 is a side view of the continuous casting and
rolling apparatus of the present invention.
FIG. 3 is a plan view illustrating a push-heat unit in
the continuous casting and the rolling apparatus of the
present invention.
FIG. 4 is a side view illustrating a periphery of the
push-heat unit in the continuous casting and the rolling
apparatus of the present invention.
FIG. 5 is a front view illustrating a heater in the
continuous casting and the rolling apparatus of the present
invention.
FIG. 6 is a front view illustrating a remover in the
continuous casting and rolling apparatus of the present
invention.
FIGS. 7a to 7c are plan views illustrating an operating
state of the push-heat unit.
FIGS. 8a to 8c are graphs illustrating a temperature
change of the steel sheet depending on the position of the
10
continuous casting and rolling apparatus by comparison
between the prior art and the present invention.
FIGS. 9 and 10 are flowcharts illustrating the
continuous casting and rolling method of the present
invention.
【Best Mode】
Hereinafter, embodiments of the invention will be
described in detail with reference to the accompanying
drawings. The drawings are attached hereto to help explain
exemplary embodiments of the invention, and the present
invention is not limited to the drawings and embodiments.
In the drawings, some elements may be exaggerated, reduced
in size, or omitted for clarity or conciseness.
A continuous casting and rolling apparatus and method
of the present invention relates to an invention whereby an
entire movement path of a steel sheet 2 can be reduced,
thereby reducing heat loss in the process of rolling of a
steel sheet 2, by selectively performing the heating
operation and the removal operation on the steel sheet 2 for
rolling in the same position.
Therefore, by reducing the consumption of energy
required by the continuous casting and rolling process, it
is possible to carry out the process efficiently.
Meanwhile, by adjusting the provision of the heater 310
for heating the steel sheet 2 or the remover 320 for
performing the removal operation on the transport path of
11
the steel sheet 2, it is possible to prevent a problem in
which the steel sheet 2 deviates from the path due to
bending or the like to collide with the heater 310 or the
remover 320.
Specifically, FIG. 2 is a side view illustrating a
continuous casting and rolling apparatus 1 of the present
invention, and FIG. 4 is a side view illustrating the
periphery of the push-heat unit 300 in the continuous
casting and rolling apparatus 1 of the present invention.
Referring to FIGS. 2 and 4, the continuous casting and
rolling apparatus 1 according to an embodiment of the
present invention may include a continuous casting device
100 producing a steel sheet 2; a hot roller 200 provided to
be linked to the continuous casting device 100 to receive
the steel sheet 2; and a push-heat unit 300 linked to at
least one of the continuous casting device 100 and the hot
roller 200 and is provided to selectively perform one of a
heating operation and a removal operation on some of the
steel sheet 2.
Further, the hot roller 200 of the continuous casting
and rolling apparatus 1 according to an aspect of the
present invention includes a first rolling section 210
provided to be connected to a rear end of the continuous
casting device 100, and a second rolling section 220
provided to be connected to a rear end of the first rolling
section 210, and the push-heat unit 300 may be provided in
12
at least one of a portion between the rear end of the
continuous casting device 100 and a front end of the first
rolling section 210, and a portion between the rear end of
the first rolling section 210 and a front end of the second
rolling section 220.
The continuous casting device 100 can serve to produce
a steel sheet 2 from molten steel through the casting
process. That is, the continuous casting device 100
supplies the molten steel from a tundish to a mold, and the
supplied molten steel forms the steel sheet 2, while being
deprived of a quantity of heat, and the steel sheet 2 is
guided and moved by a guide roll and can be supplied to the
hot roller 200 to be described later.
However, because the continuous casting device 100
produces the steel sheet 2 depending on the solidification
rate of the molten steel, it is difficult to adjust the
production rate. Therefore, when continuously receiving the
steel sheet 2 produced by the continuous casting device 100
and pressing by the hot roller 200 to be described later to
produce the rolled steel sheet 2, there is a limitation in
terms of speed. However, when continuously performing
rolling by being connected to the continuous casting device
100, there is an advantage capable of maximally utilizing
the latent heat of the steel sheet 2 discharged from the
continuous casting device 100.
13
Meanwhile, when the steel sheet 2 produced by the
continuous casting device 100 is discontinuously provided to
the hot roller 200 to produce the rolled steel sheet 2, the
hot roller 200 can rapidly perform the rolling operation
independently of the production speed of the continuous
casting device 100 to produce a rolled steel sheet 2.
However, since the rolling is performed discontinuously by
the continuous casting device 100, there is a limitation
which is incapable of maximally utilizing the latent heat of
the steel sheet 2 discharged from the continuous casting
device 100.
In this way, the process of turning the steel sheet 2
produced by the continuous casting device 100 into the
rolled steel sheet 2 by the hot roller 200 can be
distinguished by an endless rolling mode and a batch rolling
mode, and the rolling operation can be performed, while
varying the rolling production modes.
However, when varying the operation modes, there is a
problem of a degradation of the quality of the rolled steel
sheet 2. The defective steel sheet 2 needs to be removed to
solve this problem, and the defective steel sheet 2 can be
removed by the push-heat unit 300 to be described later.
Also, further, the steel sheet 2 produced in the
continuous casting device 100 needs to be heated by the hot
roller 200 to be described later to a temperature allowing
14
steel sheet 2 to be rolled, and the push-heat unit 300 can
also perform such a heating function.
The hot roller 200 can serve to receive the steel sheet
2 produced by the continuous casting device 100 and to press
the case slab 2 down, thereby producing the rolled steel
sheet 2. To this end, the hot roller 200 can press the
steel sheet 2 down, while causing the steel sheet 2 to pass
between a pair of rolling rolls, and a plurality of pairs of
rolling rolls can be provided.
Furthermore, the hot roller 200 can be independently
provided in a first rolling section 210 and a second rolling
section 220, depending on the positions being provided.
Here, the first rolling section 210 is the hot roller
200 provided to be connected to the rear end as an output
side of the continuous casting device 100, and produces the
rolled steel sheet 2 in conjunction with the second rolling
section 220 in the endless rolling mode. That is, because
the rolling process is performed in the endless rolling mode,
by utilizing the steel sheet 2 connected to the continuous
casting device 100, when suddenly performing rolling on the
steel sheet 2, the continuous casting device 100 is
influenced. Thus, a first rolled steel sheet 2 of a
constant thickness is produced in the first rolling section
210, and the finished second rolled steel sheet 2 is
produced in the second rolling section 220.
15
However, the first rolling section 210 can also produce
the rolled steel sheet 2 in the batch rolling mode in
conjunction with the second rolling section 220, without
being limited to be used only in the endless rolling mode.
In particular, the first rolling section 210 performs a
sequential rolling operation, at the time of variation from
the batch rolling mode to the endless rolling mode.
That is to say, the rolling operation is initially
performed using the cut steel sheet (slab: 2) provided by
cutting the steel sheet 2 in the batch rolling mode. After
transition to the endless rolling mode, when the first
rolling section 210 continuously receives the provision of
the steel sheet 2 produced in the continuous casting device
100, the first rolling section 210 suddenly presses the
steel sheet 2 down. Accordingly, since the continuous
casting device 100 is influenced, a strap is generated,
while the steel sheet 2 is pushed, thereby causing defects
in the steel sheet 2.
To prevent these defects, the first rolling section 210
sequentially reduces a gap between the pair of rolling rolls
to perform the sequential hot-rolling when switching from
the batch rolling mode to endless rolling mode.
However, when performing such a sequential rolling, a
steel sheet 2 including a thickness transition zone in which
the thickness of the first rolled steel sheet 2 produced by
the first rolling section 210 becomes gradually thinner is
16
produced, which degrades the quality of the rolled steel
sheet 2.
In order to remove such a defective steel sheet 2, a
push-heat unit 300 to be described later may be provided.
Further, the push-heat unit 300 may also serve to heat the
steel sheet 2 to the temperature for rolling in the second
rolling section 220 provided at the rear end of the first
rolling section 210.
Meanwhile, a holding furnace (HF) for heat insulation
may be provided at the front end as the input side of the
first rolling section 210, and the holding furnace is
intended to provide the steel sheet 2 provided by the
heating means including the continuous casting device 100 or
a push-heat unit 300 to be described later to the first
rolling section 210, while maintaining the temperature of
the steel sheet 2.
The second rolling section 220 can serve to directly
receive the first rolled steel sheet 2 produced in the first
rolling section 210 or the steel sheet 2 produced in the
continuous casting device 100, and to produce a final second
rolled steel sheet 2. The second rolling section 220 also
presses the steel sheet 2 down while being moved between a
pair of rolling rolls to produce the rolled steel sheet 2,
and the rolled steel sheet 2 thus produced is wound around a
rewinder R and is finally discharged.
17
To this end, the second rolling section 220 can be
provided to be connected to a rear end as an output side of
the first rolling section 210.
Meanwhile, a side guide before transmitting the steel
sheet 2 to the first rolling section 210 or the second
rolling section 220, in order to remove the scale and the
like adhering to the steel sheet 2, a scale cleaner (SC) may
be provided. That is, the scale cleaner SC can provided at
the rear end of the push-heat unit 300 to be described later
and at the front end of the first rolling section 210 or the
second rolling section 220.
Further, a side guide (SG) may also be provided between
the first rolling section 210 and the second rolling section
220 at the rear end of the scale cleaner SC, and the side
guide is intended to improve the quality of rolling by
providing the steel sheet 2 provided to the second rolling
section 220 in an arranged manner.
Moreover, the rolled steel sheet 2 finally rolled
through the second rolling section 220 is cut by a cutter
(C) installed at the rear end of the second rolling section
220 and is wound around the rewinder R, and then it can be
discharged as a final coil product.
The push-heat unit 300 can serve to heat the steel
sheet 2 or to cut and remove some of the steel sheet 2. In
particular, the push-heat unit 300 can set a shorter layout,
as compared to a case in which the layout of the
18
conventional continuous casting and rolling equipment was
long, by providing a conventional heating means for heating
and a removal means for removing the steel sheet 2 in
different portions of the transport path of the steel sheet
2.
To this end, the push-heat unit 300 may include a
heater 310 and a remover 320, and the heater 310 and the
remover 320 can be provided on both sides of the same
position on the path in the transport direction x of the
steel sheet 2. Such a push-heat unit 300 will be described
in detail later with reference to FIGS. 3, 7a to 7c and 8a
to 8c.
FIG. 3 is a plan view illustrating the push-heat unit
300 in the continuous casting and rolling apparatus 1 of the
present invention, FIGS. 7a to 7c are plan views
illustrating an operating state of the push-heat unit 300,
and FIGS. 8a to 8c are graphs illustrating the temperature
change of the steel sheet 2 depending on the position of the
continuous casting and rolling apparatus 1 by comparison of
a prior art and the present invention.
Here, FIG. 7a illustrates that the heater 310 of the
push-heat unit 300 is provided on the transport path of the
steel sheet 2, FIG. 7b illustrates that the remover 320 of
the push-heat unit 300 is provided on the transport path of
the steel sheet 2, and FIG. 7c illustrates that both of the
heater 300 and the remover 320 of the push-heat unit 310 are
19
provided by deviating from the transport path of the steel
sheet 2.
Also, FIG. 8a illustrates a temperature distribution
depending on the transport position of the steel sheet 2
produced by the continuous casting and the rolling apparatus
1 of the present invention, FIG. 8b illustrates a
temperature distribution corresponding to the transport
position of the steel sheet 2 produced by the prior art, and
FIG. 8c is a graph illustrating a temperature change, when
the same heat holding effect as the continuous casting and
hot roller 1 of the present invention is generated by
putting an additional quantity of heat to the apparatus
according to the prior art.
Referring to FIGS. 3, 7a to 7c and 8a to 8c, the pushheat
unit 300 of the continuous casting and rolling
apparatus 1 according to an embodiment of the present
invention may include a heater 310 provided on one side in a
widthwise direction y of the steel sheet 2 to move from one
side to the other side in the widthwise direction y of the
steel sheet 2 so as to heat the steel sheet 2, and a remover
320 provided on the other side of the steel sheet 2 in the
widthwise direction y to move from the other side to one
side of the steel sheet 2 in the widthwise direction y so as
to remove the cut steel sheet 2 cut by a cutter C located at
a rear end of a first rolling section 210 linked to a rear
end of the continuous casting device 100.
20
Further, the push-heat unit 300 of the continuous
casting and rolling apparatus 1 according to an embodiment
of the present invention may provide the heater 310 and the
remover 320 to face each other on opposite sides of the same
position in the transport direction x of the steel sheet 2.
That is, by providing the push-heat unit 300 capable of
heating the steel sheet 2 or performing a role of cutting
and removing some of the steel sheets 2 in the same location,
it is possible to set a shorter layout as compared to the
layout of the conventional continuous casting and rolling
equipment. To this end, the push-heat unit 300 may include
the heater 310 and the remover 320.
The heater 310 may serve to heat the steel sheet 2,
thereby making it possible to carry out operations in the
endless rolling mode and the batch rolling mode by raising
the steel sheet 2 to the temperature for rolling.
In particular, the heater 310 may be provided to be
movable onto the movement path of the steel sheet 2, and may
be provided on both sides of the same position as the
remover 320 to be described later, accordingly. That is,
the heater 310 can be provided on one side of the steel
sheet 2 to move from one side to the other side in the
widthwise direction y of the steel sheet 2, and the remover
320 can be provided on the other side of the steel sheet 2
on an opposite side of the heater 310 so as to face the
heater 310.
21
Thus, the continuous casting and rolling apparatus 1 of
the present invention can reduce the layout over an entire
length, as compared to the prior art, which makes it
possible to reduce the heat loss. That is, there is a need
for maintenance of the temperature for the rolling process
in the process of the steel sheet 2 produced and provided in
the continuous casting device 100 being produced as a rolled
steel sheet 2 while passing through the hot roller 200.
At this time, when the entire layout of the continuous
casting and rolling apparatus 1 is reduced, the portion and
the time of generation of heat release can be reduced, which
makes it possible to reduce final heat loss.
This can also be seen in the graphs provided in FIGS.
8a to 8c. That is, FIG. 8a illustrates temperature
distribution for each layout position according to the
present invention, and FIG. 8b illustrates temperature
distribution for each position according to the layout of
the existing device.
Here, a first point P1 is a temperature before entering
the first rolling section 210, and a second point P2 is at a
temperature after discharge from the first rolling section
210. Further, a third point P3 is a temperature before
entering the heater 310, a fourth point P4 is a temperature
after discharge from the heater 310, and a fifth point P5 is
a temperature upon finally exiting the layout.
22
Here, the temperature of the rolled steel sheet 2
rolled and discharged to the fifth point P5 is particularly
important part. That is, when mainly considering an average
temperature of the steel sheet 2, the temperature of the
fifth point P5 of the continuous casting and rolling
apparatus 1 of the present invention may be discharged while
being maintained to be higher than the temperature T5 of an
existing device by approximately 5 to 10 C. This is a
portion in which it is possible to check that the
temperature for rolling is satisfactorily maintained as
compared to the prior art.
Moreover, additional heating is required in order that
the existing devices is provided so as to be maintained at
the same temperature as the continuous casting and rolling
apparatus 1 of the present invention, which can be checked
in the graph of FIG. 8c.
That is, the continuous casting and rolling apparatus 1
of the present invention supplies power of 2 MW to the pushheat
unit 300 provided at the front end as the input side of
the second rolling section 220. At this time, when the same
power of 2 MW is supplied to the heating means of the
existing device, the temperature of the fifth point P5 is
formed to be low by about 5 to 10 C. At this time, when
additional power of 0.4 MW is further supplied to the
heating means of the existing device, as illustrated in FIG.
23
8c, the temperature of the fifth point P5 can be formed at
the same temperature as the continuous casting and rolling
apparatus 1 of the present invention.
That is to say, the present invention can reduce the
layout of the entire apparatus, by providing the push-heat
unit 300 that provides the heater 310 and the remover 320 at
the same location, thereby being able to generate an effect
capable of reducing the power of 0.4 mW (about 20%) as
compared to the prior art.
When such an effect temperature is also compared at
other points, it is possible to check that the continuous
casting and rolling apparatus 1 can maintain a higher
temperature than a temperature T3 of the existing device by
about 17 to 21 C at the third point P3, and can maintain a
higher temperature than the temperature T4 of the existing
device by about 16 to 20 C in the fourth point P4.
Specifically, as a configuration for reducing the
overall layout of the continuous casting and rolling
apparatus 1, the push-heat unit 300 provides the heater 310
and the remover 320 at the same position in the transport
direction x of the steel sheet 2.
That is, the heater 310 can be provided such that it
can move from one side to the other side of the steel sheet
2 to heat the steel sheet 2, and can be provided on one side
of the steel sheet 2.
24
Meanwhile, the remover 320 can be provided such that it
can move from the other side to one side of the steel sheet
2 in order to cut and remove some of the steel sheet 2, and
can be provided on the other side of the steel sheet 2.
In particular, in order to reduce the overall layout of
the continuous casting and rolling apparatus 1, the heater
the 310 and the remover 320 can be provided on both sides of
the same position in the transport direction x of the steel
sheet 2. That is, it is possible to reduce the overall
layout, by reducing the length as much as a region in which
the heater 310 is provided in the transport direction x of
the steel sheet 2 or a region in which the remover 320 is
provided.
Here, because the heater 310 and the remover 320 may be
provided by being selectively moved on the transport path of
the steel sheet 2, it is also possible to prevent a
collision with the steel sheet 2 in advance.
That is, the steel sheet 2 may be vertically bent or
horizontally vent by weight thereof, while a thickness
thereof is reduced via a high temperature or rolling. At
this time, since the heater 310 and the remover 320 are
provided to deviate from the transport path of the steel
sheet 2, it is possible to prevent collisions with the steel
sheet 2 in advance.
To this end, each of the heater 310 and the remover 320
selectively move onto the transport path of the steel sheet
25
2 only when heating is required in the steel sheet 2 to
perform the function.
That is, since a case in which the heater 310 and the
remover 320 are simultaneously used is eliminated, as
illustrated in FIG. 7a, when using the heater 310, the
remover 320 deviates from the transport path of the steel
sheet 2. As illustrated in FIG. 7b, when using the remover
320, the heater 310 may be provided to deviate from the
transport path of the steel sheet 2. As illustrated in FIG.
7c, when both of the heater 310 and the remover 320 are not
used, both of the heater 310 and the remover 320 may be
provided to deviate from the transport path of the steel
sheet 2.
Here, the heater 310 can provide a coil section 311 and
a coil transport section 312 for heating the steel sheet 2,
and a detailed explanation thereof will be described later
with reference to FIG. 5.
Further, the remover 320 can provide a support section
321, a vertical transport section 322 and a horizontal
transport section 323 to remove some of the steel sheet 2,
and a detailed explanation thereof will be described later
with reference to FIG. 6.
FIG. 5 is a front view illustrating the heater 310 in
the continuous casting and rolling apparatus 1 of the
present invention. Referring to FIG. 5, the heater 310 of
the continuous casting and rolling apparatus 1 according to
26
an embodiment of the present invention includes a coil
section 311 that is connected a power supply unit PS and
provided to regulate the heating temperature, and a coil
transport section 312 that moves the coil section 311 in the
widthwise direction y of the steel sheet 2.
Further, the coil section 311 of the continuous casting
and rolling apparatus 1 according to an embodiment of the
present invention may include a core 311a provided in a “U”
shape to heat a top and a bottom of the steel sheet 2, and a
coil 311b which is provided by being wound around the core.
That is, the heater 310 can provide the coil section
311 and the coil transport section 312 to move to the steel
sheet 2 and to heat the steel sheet 2.
The coil section 311 serves to heat the steel sheet 2
by induction heating, and to this end, the coil section 311
can be provided to be connected to the coil transport
section 312 to be described later. Thus, the coil section
311 heats the steel sheet 2, and at this time, since the
coil section 311 performs the induction heating, it is
possible to control the heating amount.
To this end, the coil section 311 can provide the core
311a and the coil 311b, the core 311a can be provided in a
“U” shape, and the coil 311b can be provided by being wound
around the core 311a.
That is, as illustrated in (a) of FIG. 5, the coil 311b
can also be provided by being wound around the core 311a in
27
the direction x parallel to the steel sheet 2, and as
illustrated in (b) of FIG. 5, the coil 311b can also be
provided by being wound around the core 311a in a direction
z perpendicular to the steel sheet 2.
Here, because the core 311a is provided by being
inserted into the side surface of the steel sheet 2 in a “U”
shape, the core 311a simultaneously heats the upper and
lower surfaces of the steel sheet 2 to generate an advantage
of even heating.
The coil transport section 312 can serve to move the
coil section 311 from one side to the other side of the
steel sheet 2. To this end, the coil transport section 312
is provided as a hydraulic or pneumatic cylinder and may be
provided so as to be connected to the coil section 311.
Such a coil section 311 and the coil transport section
312 are connected to the control unit 330 to adjust the
heating amount or the movement amount, and may be connected
the power supply unit PS.
FIG. 6 is a front view illustrating the remover 320 in
the continuous casting and rolling apparatus 1 of the
present invention. Referring to FIG. 6, the remover 320 of
the continuous casting and rolling apparatus 1 according to
an embodiment of the present invention may include a support
section 321 provided to support the cut steel sheet 2 in
contact with the bottom of the cut steel sheet 2, a support
vertical transport section for vertically moving the support
28
section 321, and a horizontal transport section 323 for
moving the support section 321 in the widthwise direction y
of the steel sheet 2.
That is, the remover 320 can provide the support
section 321, the vertical transport section 322 and the
horizontal transport section 323 to move to the steel sheet
2 and remove some of the steel sheet 2.
In particular, since the remover 320 may be provided to
move to the transport path of the steel sheet 2 only when
necessary, it is possible to avoid interference with the
steel sheet 2, and by being provided on the other side of
the moving path of the steel sheet 2 at the same position as
the heater 310, it is possible to reduce the layout of the
continuous casting and rolling apparatus 1 of the present
invention.
Here, the remover 320 is necessary to cut and remove
the portion of the defective steel sheet 2 in the steel
sheet 2. Such a defective steel sheet 2 may include a
defective steel sheet 2 which does not reach the required
state at the initial continuous casting using the continuous
casting device 100, or a defective steel sheet 2 with the
gradually thinner thickness that occurs when switching from
the batch rolling mode to the endless rolling mode.
Thus, the remover 320 is temporarily necessary in order
to remove the defective steel sheet 2, and may include a
cutter C for cutting the defective steel sheet 2. The cut
29
defective steel sheet 2 can be removed by the support
section 321, the vertical transport section 322 and the
horizontal transport section 323.
The support section 321 is provided to be in contact
with the lower surface of the cutting steel sheet 2, and can
be provided to be moved by the vertical transport section
322 and the horizontal transport section 323.
Here, the support section 321 can provide a contact
plate 321a, a base plate 321b and a guide tab 321c in order
to vertically transport the cut steel sheet 2 by the
vertical transport section 322.
That is, the contact plate 321a is a portion that is in
contact with the cut steel sheet 2, the base plate 321b is a
portion that is connected to the horizontal transport
section 323 and to which the vertical transport section 322
is coupled. Further, on the side surface of the base plate
321b, a guide tab 321c for guiding the contact plate 321a
may be formed so that the contact plate 321a is vertically
moved by receiving the transmission of the driving force by
the vertical transport section 322.
That is to say, a side wall can be formed in the base
plate 321b in the vertical direction z, the guide tab 321c
can be formed and provided on the side wall, and the contact
plate 321a can be provided by the formation of a guide
groove having a shape corresponding to the guide tab 321c so
30
that the guide tab 321c can be inserted into the guide
groove.
The vertical transport section 322 may be provided as a
hydraulic or pneumatic cylinder, one end portion thereof can
be provided by being coupled to the inner surface of the
base plate 321b, and the other end portion thereof is
coupled to the contact plate 321a to provide a driving force
capable of vertically moving the contact plate 321a.
The horizontal transport section 323 can serve to move
the support section 321 from the other side to one side in
the transport direction x of the steel sheet 2 so as to
provide the support section 321 to the transport path of the
steel sheet 2. To this end, the horizontal transport
section 323 can be provided as a hydraulic or pneumatic
cylinder and is coupled to the base plate 321b to transmit
the driving force capable of moving the base plate 321b to
the left-right side of the steel sheet 2 in the widthwise
direction y.
Further, the vertical transport section 322 and the
horizontal transport section 323 are connected to the
control unit 330 to adjust the traveled distance, and are
connected to the power supply unit PS to receive the supply
of power.
FIGS. 9 and 10 are flow charts illustrating a
continuous casting and rolling method of the present
invention, FIG. 9 is a flowchart illustrating an overall
31
continuous casting and rolling step, and FIG. 10 is a
flowchart illustrating only the selectively performed step.
Referring to FIGS. 9 and 10, a continuous casting and
rolling method according to another embodiment of the
present invention may include a continuous casting step of
producing a steel sheet 2; a rolling step of pressing the
steel sheet down 2; and a selectively performed step of
selectively determining whether to perform one of a heating
operation and a removal operation on some of the steel sheet
2, at the same position on the transport path of the steel
sheet 2.
Further, the selectively performed step of the
continuous casting and rolling method according to another
embodiment of the present invention may selectively activate
a heating step of heating a portion of the steel sheet 2, a
removal step of removing the cut steel sheet 2 obtained by
the cutting of some of the steel sheet 2 in the transport
direction x of the steel sheet, and a standby step of not
performing the heating step and the removal step.
Further, the rolling step of the continuous casting and
rolling method according to another embodiment of the
present invention may include a first rolling step, and a
second rolling step performed after the first rolling step,
wherein the selectively performed step may be performed
prior to at least one of the first rolling step and the
second rolling step.
32
The continuous casting step is a step of producing a
steel sheet 2 by the continuous casting device 100 and
receiving the molten steel by the continuous casting to
provide the steel sheet 2. The defective steel sheet 2
failed to reach the required state is produced in the
initial continuous casting, and cut and removed by the
remover 320 of the push-heat unit 300 connected to the rear
end of the continuous casting device 100 in the selectively
performed step.
The selectively performed step is a step of selectively
performing the heating step and the removal process of the
steel sheet 2. That is, the above-mentioned selectively
performed step is a step of selectively performing one of
the heating step, the removal step and the standby step.
Here, the heating step is a step of heating the steel
sheet 2 to a temperature for rolling by the heater 310 of
the push-heat unit 300, the removal step is a step of
removing the defective steel sheet 2 in the steel sheet 2 by
the remover 320 of the push-heat unit 300, and the standby
step is a step of neither heating nor removing the steel
sheet 2.
Although the selectively performed step can selectively
perform the heating step, the removal step and the standby
step, since it is desirable not to perform the rolling in
the defective steel sheet 2 removed in the removal step,
there the heating step for rolling is not required, and it
33
is desirable to selectively perform the operation of heating
or removal.
By selectively performing one of the heating step, the
removal step and the standby step in a single selectively
performed step, it is possible to reduce the overall layout
of the aforementioned continuous casting apparatus, thereby
reducing the heat loss of the rolled steel sheet 2.
The rolling step is a step of receiving the steel sheet
2 produced by the continuous casting step and pressing the
steel sheet down to produce a rolled steel sheet 2. The
rolling step is desirably provided at the desired
temperature for rolling in order to produce a rolled steel
sheet 2 with excellent quality.
Here, the rolling step can press the steel sheet
separately into the first rolling step and the second
rolling step to prevent an influence on the continuous
casting device 100 in the endless rolling mode of
manufacturing the rolled steel sheet 2, while continuously
receiving the steel sheet 2 produced in the continuous
casting step.
That is, the first rolling step is a coarse rolling
step provided by pressing the steel sheet down 2 to form
only the thickness of the constant portion before forming
the final thickness of the rolled steel sheet 2, and the
second rolling step is a finishing rolling step producing a
final second rolled steel sheet 2 by pressing down the first
34
rolled steel sheet 2 after passing through the first rolling
step.
The first rolling step may be performed after the
continuous casting step, and the second rolling step may be
performed after the first rolling step. However, in order
to improve the quality of the rolled steel sheet 2, the
selectively performed step may be performed between the
continuous casting step and the first rolling step, and may
be performed between the first rolling step and the second
rolling step.
35
【WE CLAIM:】
【Claim 1】
A continuous casting and rolling apparatus comprising:
a continuous casting device producing a steel sheet;
a hot roller provided to be linked to the continuous
casting device to receive the steel sheet; and
a push-heat unit linked to at least one of the
continuous casting device and the hot roller and is provided
to selectively perform one of a heating operation and a
removal operation on some of the steel sheet.
【Claim 2】
The continuous casting and rolling apparatus of claim 1,
wherein the push-heat unit comprises:
a heater provided on one side of the steel sheet in a
widthwise direction to move from one side to the other side
of the steel sheet in the widthwise direction so as to heat
the steel sheet; and
a remover provided on the other side of the steel sheet
in the widthwise direction to move from the other side to
one side of the steel sheet in the widthwise direction so as
to remove the cut steel sheet that is cut by a cutter
located at a rear end of a first rolling section linked to a
rear end of the continuous casting device.
【Claim 3】
36
The continuous casting and rolling apparatus of claim 2,
wherein the push-heat unit provides the heater and the
remover to face each other on both sides of the same
position in a transport direction of the steel sheet.
【Claim 4】
The continuous casting and rolling apparatus of claim 2,
wherein the heater comprises:
a coil section provided by being connected to a power
supply unit to control a heating temperature; and
a coil transport section that moves the coil section of
the steel sheet in the widthwise direction.
【Claim 5】
The continuous casting and rolling apparatus of claim 4,
wherein the coil section comprises:
a core provided in a “U” shape to heat a top and a
bottom of the steel sheet; and
a coil which is provided by being wound around the core.
【Claim 6】
The continuous casting and rolling apparatus of claim 2,
wherein the remover comprises:
a support section provided to support the cut steel
sheet in contact with the bottom of the cut steel sheet;
a support vertical transport section that vertically
moves the support section; and
37
a horizontal transport section that moves the support
section of the steel sheet in the widthwise direction.
【Claim 7】
The continuous casting and rolling apparatus of claim 1,
wherein the hot roller comprises a first rolling section
provided to be connected to the rear end of the continuous
casting device, and a second rolling section provided to be
connected to the rear end of the first rolling section, and
the push-heat unit is provided in at least one of a
portion between the rear end of the continuous casting
device and a front end of the first rolling section, and a
portion between the rear end of the first rolling section
and a front end of the second rolling section.
【Claim 8】
A continuous casting and rolling method comprises:
a continuous casting step of producing a steel sheet;
a rolling step of pressing the steel sheet down; and
a selectively performed step of selectively determining
whether to perform one of a heating operation and a removal
operation on some of the steel sheet, at the same position
on a transport path of the steel sheet.
【Claim 9】
The method of claim 8, wherein the selectively
performed step selectively activates one of
a heating step of heating a portion of the steel sheet;
38
a removal step of removing the cut steel sheet cut in
the transport direction of the steel sheet; and
a standby step of not performing the heating step and
the removal step.
【Claim 10】
The method of claim 8, wherein the rolling step
comprises:
a first rolling step, and a second rolling step
performed after the first rolling step,
wherein the selectively performed step is performed
prior to at least one of the first rolling step and the
second rolling step.