JP2009214137A - Twin drum type continuous casting equipment and continuous casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a twin drum type continuous casting machine which winds a slab around either cooling drum and then pulls out the slab, in which, even if a variation in the diameters of the cooling drums by a thermal expansion amount or the like in both cooling drums can not be directly recognized, circumferential speeds of the drums are made the same, and therefore shear stress is not applied from the cooling drum to the slab. <P>SOLUTION: In the twin drum type continuous casting machine which winds the slab 113 around the cooling drum 102 and then pulls out the slab 113, the cooling drum 101 and the cooling drum 102 are rotationally driven by a motor 121 and a motor 123, respectively independently. Then, a controller 120 controls the rotational speeds of the motors 121 and 123 using measured torque values T1 and T2 measured with torque meters 122 and 124. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a twin-drum type continuous casting equipment and a continuous casting method, and is devised so that a high quality cast piece can be cast.

  The continuous casting machine continuously casts molten steel that has been refined, and directly produces a slab (slab or strip). As a kind of such continuous casting machine, a twin drum type continuous casting machine has been developed.

  Furthermore, as one form of such a twin drum type continuous casting machine, a slab is wound around a circumferential surface of one of the cooling drums over a predetermined length, and then pulled out from the cooling drum. A continuous casting machine has also been devised (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 02-290651

In the twin-drum type continuous casting machine described in Patent Document 1, in order to prevent stress due to a difference in peripheral speed from acting on a thin cast piece and generating defects such as transverse cracks, the thickness of the thin cast piece is reduced. The peripheral speed is adjusted accordingly.
However, this alone has the problem that the peripheral speed difference cannot be adjusted in the following cases.

(1) The cooling drum around which a high-temperature slab is wound has a longer contact length with the slab of the cooling drum than the slab of the other cooling drum. Expansion also increases.
For this reason, a difference occurs in the diameter of the cooling drum, and the peripheral speed difference cannot be adjusted by the method of Patent Document 1 alone.
(2) Also, when the cooling drum has a different diameter, which is a combination of a large diameter and a small diameter, the thermal capacity of the cooling drum is different even if the slab is not wound around one side, so the amount of thermal expansion differs, The diameter difference between the two changes, and the peripheral speed difference cannot be adjusted by the method of Patent Document 1 alone.
(3) Further, even if the cooling drum has the same diameter and the slab is not wound on one side, if the material of the cooling drum is different, the amount of thermal expansion is different, resulting in a difference in the diameter of the cooling drum. It is impossible to adjust the peripheral speed difference only by the method.

  An object of this invention is to provide the twin drum type continuous casting equipment and continuous casting method which can cast the high quality cast piece without a transverse crack etc. in view of the said prior art.

The configuration of the twin drum continuous casting equipment of the present invention that solves the above problems is as follows.
A twin-drum continuous casting machine having a pair of cooling drums and drawing a slab from the cooling drum;
Based on the drum driving load of the first cooling drum that is one of the pair of cooling drums and the drum driving load of the second cooling drum that is the other of the pair of cooling drums, And a control device that controls at least one of a rotational speed of a first motor that drives the first cooling drum and a rotational speed of a second motor that drives the second cooling drum.

The configuration of the twin drum continuous casting equipment of the present invention is as follows.
A twin-drum continuous casting machine having a pair of cooling drums and drawing a slab from the cooling drum;
Based on the drum temperature of the first cooling drum that is one of the pair of cooling drums and the drum temperature of the second cooling drum that is the other of the pair of cooling drums, the first And a controller for controlling at least one of the rotational speed of the first motor that drives the cooling drum and the rotational speed of the second motor that drives the second cooling drum.

The configuration of the continuous casting method of the present invention is as follows:
In a continuous casting facility having a pair of cooling drums and having a twin-drum continuous casting machine that draws a slab from the cooling drum,
The difference between the drum driving load of the first cooling drum that is one of the pair of cooling drums and the drum driving load of the second cooling drum that is the other of the pair of cooling drums is: Control at least one of the number of rotations of the first motor that drives the first cooling drum and the number of rotations of the second motor that drives the second cooling drum so that the preset drum driving load difference is set. It is characterized by that.

The configuration of the continuous casting method of the present invention is as follows:
In a continuous casting facility having a pair of cooling drums and having a twin-drum continuous casting machine that draws a slab from the cooling drum,
The difference between the drum temperature of the first cooling drum that is one of the pair of cooling drums and the drum temperature of the second cooling drum that is the other of the pair of cooling drums is preset. And controlling at least one of the number of rotations of the first motor driving the first cooling drum and the number of rotations of the second motor driving the second cooling drum so that the set temperature difference is achieved. To do.

According to the present invention, by adjusting the rotational driving load of the pair of cooling drums, the peripheral speed difference can be reduced even if the diameter of the cooling drum is not known.
Moreover, it can adjust so that a peripheral speed difference may be reduced by calculating | requiring the change of the diameter of a cooling drum from the cooling drum temperature of a pair of cooling drum.
As a result, since the peripheral speed difference can be made extremely small, stress caused by the peripheral speed difference does not act on the slab, and defects such as transverse cracks do not occur, and a high-quality slab can be obtained.

  The best mode for carrying out the present invention will be described below in detail based on examples.

  A twin drum type continuous casting facility according to Example 1 of the present invention will be described with reference to FIG. 1 and FIG. 2 which is a view taken along the line II-II in FIG.

  In the twin drum type continuous casting machine 100 used for the twin drum type continuous casting equipment according to the first embodiment, the flat drum (cooling drum) 101 and the concave drum (cooling drum) 102 rotating in the opposite directions are placed at the same height position. The both ends of the drums 101 and 102 in the axial direction are partitioned by side weirs 103 and 104 that are crimped to the end surfaces of the drums. Molten steel 106 is supplied to the internal space (hot water reservoir) of the moving mold formed by the drums 101 and 102 and the side weirs 103 and 104 through the nozzle 105.

  The flat drum 101 is a columnar (or cylindrical) drum having no stepped portion, and the concave drum 102 is a drum having stepped portions 102a and 102b at both ends of the drum.

  When the pair of drums 101 and 102 rotate in directions opposite to each other, the molten steel 106 is cooled by contacting the surfaces of the drums 101 and 102 (this surface includes the surfaces of the step portions 102a and 102b), and the solidified shell 111 , 112 are formed. The solidified shells 111 and 112 grow as the drum rotates. The end of the solidified shell 111 and the end of the solidified shell 112 are pressed and integrated at the smallest gap where the gap between the flat drum 101 and the concave drum 102 is the smallest. At this time, both ends of the solidified shell 111 and the solidified shell 112 are pressed and integrated, and as shown in FIG. 2, both the solidified shells 111 and 112 are joined together with the unsolidified molten steel 106 left in the center portion. It becomes a piece 113.

The slab 113 sent out from the minimum gap portion is continuously wound around the circumferential surface of the concave drum 102 over a predetermined length α, and after passing through the portion sandwiched between the concave drum 102 and the pressing rollers 114a to 114d, It is pulled away from the concave drum 102.
In addition, the unsolidified molten steel 106 in the central portion of the slab 113 is solidified while being sent out from the minimum gap portion and being conveyed.
In this manner, the thick slab 113 can be cast.

  Next, a drive system and a drive control system for driving the drums 101 and 102 of the twin drum type continuous casting machine 100 will be described.

  The cooling drum (flat drum) 101 is rotationally driven by a motor 121. The magnitude of the drum driving load of the cooling drum 101 (the magnitude of the rotational load when the cooling drum 101 is viewed as a rotating load), that is, the magnitude of the driving torque transmitted from the motor 121 to the cooling drum 101 is the torque. It is measured by a total 122. The measured torque value T1 measured by the torque meter 122 is sent to the control device 120.

  The cooling drum (concave drum) 102 is rotationally driven by a motor 123. The magnitude of the drum driving load of the cooling drum 102 (the magnitude of the rotational load when the cooling drum 102 is viewed as a rotating load), that is, the magnitude of the driving torque transmitted from the motor 123 to the cooling drum 102 is the torque. It is measured by a total 124. The measured torque value T2 measured by the torque meter 124 is sent to the control device 120.

When the peripheral speed of the peripheral surface of the cooling drum 101 is equal to the peripheral speed of the outer surface of the slab 113 wound around the cooling drum 102 (surface on the side in contact with the cooling drum 101) in the minimum gap portion, the slab No shear stress due to the difference in peripheral speed acts on 113.
At this time, the difference between the magnitude of the drum driving load of the cooling drum 102 and the magnitude of the drum driving load of the cooling drum 101 is set as a set torque difference ΔT0. This set torque difference ΔT0 is preset in the control device 120. ing.

The control device 120 has a function of controlling the driving of the motors 121 and 123.
The control device 120 calculates an actual torque difference ΔT (= T2−T1) between the measured torque value T2 and the measured torque value T1, and rotates the motor 121 so that the actual torque difference ΔT becomes equal to the set torque difference ΔT0. The speed is controlled.
Basically, if the rotational speed of the motor is ω, the moment of inertia is J, and the torque is T,
Since T∝J (dω / dt), the torque also changes when the rotational speed of the motor is changed.

  When casting is performed, the cooling drums 101 and 102 are thermally expanded and the radius thereof increases. In this case, since the slab 113 is wound around the cooling drum 102 and the heat input amount is large, the thermal expansion amount of the cooling drum 102 is larger than the thermal expansion amount of the cooling drum 101.

In this way, when the thermal expansion amount of the cooling drum 102 becomes larger than the thermal expansion amount of the cooling drum 101, the peripheral speed of the peripheral surface of the cooling drum 101 is changed to the outer surface (cooling) of the slab 113 wound around the cooling drum 102. It becomes slower than the peripheral speed of the surface on the side in contact with the drum 101.
For this reason, the cooling drum 101 works to brake the slab 113, and the drum driving load (= measurement torque value T1) of the cooling drum 101 decreases.
In this state, shear stress acts on the slab 113 due to the difference in drum peripheral speed.

  In this example, when the control device 120 determines that the drum driving load (= measured torque value T1) of the cooling drum 101 is decreased and the measured torque difference ΔT is larger than the set torque difference ΔT0, the measured torque difference ΔT. Is controlled to increase the rotational speed of the motor 121 so that becomes equal to the set torque difference ΔT0. Thereby, the speed of the cooling drum 101 is increased.

  As described above, since the rotation speed of the motor 121 is controlled by the control device 120, even if the thermal expansion amount of the cooling drum 102 becomes larger than the thermal expansion amount of the cooling drum 101, the peripheral surface of the cooling drum 101. The peripheral speed of the slab 113 wound around the cooling drum 102 and the peripheral speed of the outer surface of the slab 113 (the surface on the side in contact with the cooling drum 101) can be made equal, and the slab 113 is sheared due to the difference in peripheral speed. It is possible to prevent the stress from acting.

  Thus, since it can prevent that the shear stress resulting from a peripheral speed difference is added to the slab 113, the slab 113 becomes a product with the outstanding shape characteristic, without applying a shear stress.

In the first embodiment, the rotational speed of the motor 121 is controlled so that the actually measured torque difference ΔT (= T2−T1) is equal to the set torque difference ΔT0. However, the rotational speed of the motor 123 is controlled. You may make it do.
Further, both the rotational speed of the motor 121 and the rotational speed of the motor 123 may be controlled so that the actually measured torque difference ΔT (= T2−T1) becomes equal to the set torque difference ΔT0.

Here, the concept of control in the first embodiment will be collectively shown.
The torque of each motor is basically the sum of the reduction Tp (F), drive Td (R), and other (device-specific) Tc. Therefore, if the rolling force does not change, a change in drum diameter appears as a change in driving torque.
The torque T1 of the flat drum and the torque T2 of the concave drum are as follows.
T1 = T1p (F) + T1d (R1) + T1c
T2 = T2p (F) + T2d (R2) + T2c

The flat drum torque T10, the concave drum torque T20, and the flat drum torque and the concave drum set torque difference ΔT0 at the reference time (when the drum diameter is clear) are as follows.
T10 = T1p0 (F) + T1d0 (R1) + T1c0
T20 = T2p0 (F) + T2d0 (R2) + T2c0
ΔT0 = T10−T20 = (T1p0 (F) + T1d0 (R1) + T1c0) − (T2p0 (F) + T2d0 (R2) + T2c0)
= {(T1p0 (F) + T1c0)-(T2p0 (F) + T2c0)} + {T1d0 (R1) -T2d0 (R2)}

Flat drum torque T11, concave drum torque T21, flat drum torque and concave drum set torque difference during casting (when the drum diameter is thermally expanded, but the rolling force F is the same as the reference time) ΔT is as follows.
T11 = T1p1 (F) + T1d1 (R1 ′) + T1c1
T21 = T2p1 (F) + T2d1 (R2 ′) + T2c1
ΔT = T11−T21 = (T1p1 (F) + T1d1 (R1 ′) + T1c1) − (T2p1 (F) + T2d1 (R2 ′) + T2c1)
= {(T1p1 (F) + T1c1)-(T2p1 (F) + T2c1)} + {T1d1 (R1 ')-T2d1 (R2')}

Assuming that the reduction force is the same, the difference between the flat drum and the concave drum of the torque due to the reduction and other (device-specific) torque can be considered as constant, so the difference of ΔT0−ΔT is the difference between the flat drum and the concave drum of the drive torque Will reflect the change in speed balance.
Therefore, if the rotational speed of the flat drum (or / and the concave drum) is controlled so that ΔT−ΔT0 is 0, the peripheral speed difference between the two drums can be reduced.

To summarize the above, at the time of casting,
(1) When the set (reference) torque difference ΔT0> measured (casting) torque difference, the speed of the flat drum is reduced,
(2) Control is performed to increase the speed of the flat drum when the set (reference) torque difference ΔT0 <actually measured (during casting).

Next, a twin drum type continuous casting facility according to Embodiment 2 of the present invention will be described with reference to FIG.
In the second embodiment, the configuration of the twin drum continuous casting machine 100 is the same as that of the first embodiment, and the drum drive system and the drive control system are different from those of the first embodiment.
For this reason, the same reference numerals are given to the same parts as those in the first embodiment, and the duplicate description is omitted, and the parts unique to the second embodiment will be described.

The cooling drum (flat drum) 101 of the twin drum type continuous casting machine 100 is driven to rotate by a motor 131.
The control device 130 supplies a current I1 to the motor 131. The current value of the current I1 is measured by an ammeter 132, and the measured current value i1 is sent to the control device 130.

  The magnitude of the drum driving load of the cooling drum 101 corresponds (proportional) to the magnitude of the current I1 supplied to the motor 131 that rotationally drives the cooling drum 101.

The cooling drum (concave drum) 102 of the twin drum type continuous casting machine 100 is rotationally driven by a motor 133.
The control device 130 supplies a current I2 to the motor 133, the current value of the current I2 is measured by an ammeter 134, and the measured current value i2 is sent to the control device 130.

  The magnitude of the drum driving load of the cooling drum 102 corresponds (proportional) to the magnitude of the current I2 supplied to the motor 133 that rotationally drives the cooling drum 102.

When the peripheral speed of the peripheral surface of the cooling drum 101 is equal to the peripheral speed of the outer surface of the slab 113 wound around the cooling drum 102 (surface on the side in contact with the cooling drum 101) in the minimum gap portion, the slab No shear stress due to the difference in peripheral speed acts on 113.
The difference in magnitude between the measured current value i1 and the measured current value i2 at this time is set current value difference Δi0, and this set current value difference Δi0 is preset in the control device 130.

The control device 130 has a function of controlling driving of the motors 131 and 133.
The control device 130 obtains an actually measured current value difference Δi (= i2−i1) between the measured current value i2 and the measured current value i1, and the motor so that the actually measured current value difference Δi becomes equal to the set current value difference Δi0. The rotational speed difference 131 is controlled.

  When casting is performed, the cooling drums 101 and 102 are thermally expanded and the radius thereof increases. In this case, since the slab 113 is wound around the cooling drum 102 and the heat input amount is large, the thermal expansion amount of the cooling drum 102 is larger than the thermal expansion amount of the cooling drum 101.

In this way, when the thermal expansion amount of the cooling drum 102 becomes larger than the thermal expansion amount of the cooling drum 101, the peripheral speed of the peripheral surface of the cooling drum 101 is changed to the outer surface (cooling) of the slab 113 wound around the cooling drum 102. It becomes slower than the peripheral speed of the surface on the side in contact with the drum 101.
For this reason, the cooling drum 101 works to brake the slab 113, the drum driving load of the cooling drum 101 is reduced, and the measured current value i1 is reduced.
In this state, shear stress acts on the slab 113 due to the difference in drum peripheral speed.

  In this example, when the control device 130 determines that the measured current value i1 has decreased and the measured current value difference Δi has become larger than the set current value difference Δi0, the measured current value difference Δi becomes the set current value difference Δi0. Control is performed so as to increase the rotational speed of the motor 131 so as to be equal. Thereby, the speed of the cooling drum 101 is increased.

  As described above, since the rotation speed of the motor 131 is controlled by the control device 130, even if the thermal expansion amount of the cooling drum 102 is larger than the thermal expansion amount of the cooling drum 101, the peripheral surface of the cooling drum 101. The peripheral speed of the slab 113 wound around the cooling drum 102 and the peripheral speed of the outer surface of the slab 113 (the surface on the side in contact with the cooling drum 101) can be made equal, and the slab 113 is sheared due to the difference in peripheral speed. It is possible to prevent the stress from acting.

  Thus, since it can prevent that the shear stress resulting from a peripheral speed difference is added to the slab 113, the slab 113 becomes a product with the outstanding shape characteristic, without applying a shear stress.

In the second embodiment, the rotational speed of the motor 131 is controlled so that the measured current value difference Δi (= i2−i1) is equal to the set current value difference Δi0. You may make it control.
Further, both the rotational speed of the motor 131 and the rotational speed of the motor 133 may be controlled so that the actually measured current value difference Δi (= i2−i1) becomes equal to the set current value difference Δi0.

Next, a twin drum type continuous casting facility according to Example 3 of the present invention will be described with reference to FIG.
In the third embodiment, the configuration of the twin drum type continuous casting machine 100 is the same as that of the first embodiment, and the drum drive system and the drive control system are different from the first embodiment.
For this reason, the same reference numerals are given to the same parts as those in the first embodiment, and the duplicate description will be omitted, and the parts unique to the third embodiment will be described.

The cooling drum (flat drum) 101 of the twin drum type continuous casting machine 100 is rotationally driven by a motor 141. The control device 140 controls the drum rotation speed of the cooling drum 101 by controlling the supply current I1 to the motor 141.
The cooling drum (concave drum) 102 of the twin drum type continuous casting machine 100 is rotationally driven by a motor 143. The control device 140 controls the drum rotation speed of the cooling drum 102 by controlling the supply current I2 to the motor 143.

In this case, since the cooling drum 101 is thermally expanded, the radius thereof corresponds (proportional) to the temperature of the cooling drum 101.
Further, since the cooling drum 102 is thermally expanded, the radius thereof corresponds (proportional) to the temperature of the cooling drum 102.

Further, a thermometer 142 that measures the temperature of the cooling drum 101 and a thermometer 144 that measures the temperature of the cooling drum 102 are arranged in the minimum gap portion.
As the thermometers 142 and 143, any type of thermometer such as a contact type that contacts the outside of the drums 101 and 102 or a non-contact type may be used.
In the case of the embedded type embedded in the drums 101 and 102, the signal line may be taken out of the drums 101 and 102 via a slip ring or the like, and the measurement is performed in synchronization with the rotation angle of the drums 101 and 102. For example, the temperature at an arbitrary rotation angle of the drums 101 and 102 can be measured. Moreover, you may employ | adopt the average temperature per rotation of drum 101,102.
The measured temperature value t1 of the cooling drum 101 measured by the thermometer 142 and the measured temperature value t2 of the cooling drum 102 measured by the thermometer 144 are sent to the control device 140.

  When the peripheral speed of the peripheral surface of the cooling drum 101 is equal to the peripheral speed of the outer surface of the slab 113 wound around the cooling drum 102 (surface on the side in contact with the cooling drum 101) in the minimum gap portion, the slab No shear stress due to the difference in peripheral speed acts on 113.

The control device 140 supplies a current I1 to the motor 141 and supplies a current I2 to the motor 143.
Further, in the control device 140, the coefficient of thermal expansion of the cooling drums 101 and 102, the radius of the cooling drums 101 and 102 at a predetermined reference temperature, and the plate thickness of the cast slab 113 are preset.

  When casting is performed, the cooling drums 101 and 102 are thermally expanded and the radius thereof increases. In this case, since the slab 113 is wound around the cooling drum 102 and the heat input amount is large, the thermal expansion amount of the cooling drum 102 is larger than the thermal expansion amount of the cooling drum 101.

In this way, when the thermal expansion amount of the cooling drum 102 becomes larger than the thermal expansion amount of the cooling drum 101, the peripheral speed of the peripheral surface of the cooling drum 101 is changed to the outer surface (cooling) of the slab 113 wound around the cooling drum 102. It becomes slower than the peripheral speed of the surface on the side in contact with the drum 101.
For this reason, the cooling drum 101 works to brake the slab 113, and the drum driving load of the cooling drum 101 is reduced.
In this state, shear stress acts on the slab 113 due to the difference in drum peripheral speed.

In this example, the control device 140 receives the measured temperature value t1 from the thermometer 142, and based on the measured temperature value t1, the thermal expansion coefficient of the cooling drum 101, and the radius of the cooling drum 101 at a predetermined reference temperature, The peripheral speed of the cooling drum 101 when the temperature is the measured temperature value t1 is obtained by calculation.
The control device 140 receives the measured temperature value t2 from the thermometer 144, and the drum temperature is determined based on the measured temperature value t2, the thermal expansion coefficient of the cooling drum 102, and the radius of the cooling drum 102 at a predetermined reference temperature. The peripheral speed of the cooling drum 102 when the measured temperature value t2 is reached is obtained by calculation. Further, in consideration of the thickness of the cast slab 113 to be cast, the peripheral speed of the outer surface of the cast slab 113 (the surface on the side in contact with the cooling drum 101) is obtained.

  Then, the control device 140 performs control so as to increase the rotational speed of the motor 141 so that the peripheral speed of the cooling drum 101 obtained by the calculation matches the peripheral speed of the outer surface of the cast slab 113 obtained by the calculation. Thereby, the speed of the cooling drum 101 is increased.

  As described above, since the rotation speed of the motor 141 is controlled by the control device 140, even if the thermal expansion amount of the cooling drum 102 is larger than the thermal expansion amount of the cooling drum 101, the peripheral surface of the cooling drum 101 is The peripheral speed of the slab 113 wound around the cooling drum 102 and the peripheral speed of the outer surface of the slab 113 (the surface on the side in contact with the cooling drum 101) can be made equal, and the slab 113 is sheared due to the difference in peripheral speed. It is possible to prevent the stress from acting.

  Thus, since it can prevent that the shear stress resulting from a peripheral speed difference is added to the slab 113, the slab 113 becomes a product with the outstanding shape characteristic, without applying a shear stress.

  In the example of FIG. 4, the temperature of the minimum gap portion is actually measured by the thermometers 142 and 143. However, when the temperature cannot be measured at the minimum gap portion, the drum temperature at a position away from the minimum gap portion is measured. Then, the temperature change up to the measurement position and the minimum gap portion may be predicted, and the temperature of the minimum gap portion may be calculated based on the predicted value and the measured temperature values t1 and t2.

  Further, without using a thermometer, by calculation based on the temperature of the molten steel, the thickness and drawing speed of the cast slab 113, the radius and thermal expansion coefficient at the reference temperature of the drums 101 and 102, the elapsed time from the start of casting, etc. The temperature of the minimum gap part can also be obtained by calculation.

  In the third embodiment, the peripheral speed of the cooling drum 101 obtained by calculation based on the measured temperature value t1 is equal to the peripheral speed of the outer surface of the slab 113 obtained by calculation based on the measured temperature value t2. Although the rotation speed of the motor 141 is controlled so as to match, the rotation speed of the motor 143 may be controlled.

[Modification]
In Examples 1 to 3, one of the twin-drum continuous casting machines is a flat drum and the other is a concave drum, but both are concave drums, both are flat drums, The present invention can be applied even if both drums have different diameters.
When the concave drum is employed, not only the type shown in FIG. 2 but also the diameter of both ends of the drum in the axial direction is larger than the diameter of the central portion (portion other than both ends) of the drum. Various types of concave drums can be used.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the twin drum type continuous casting installation which concerns on Example 1 of this invention. Sectional drawing which shows the II-II cross section of FIG. The block diagram which shows the twin drum type continuous casting installation which concerns on Example 2 of this invention. The block diagram which shows the twin drum type continuous casting installation which concerns on Example 3 of this invention.

Explanation of symbols

100 Twin-drum continuous casting machine 101 Flat drum (cooling drum)
102 Concave drum (cooling drum)
103, 104 Side weir 105 Nozzle 106 Molten steel 111, 112 Solidified shell 113 Cast slab 114a-114d Pressing roller 120 Controller 121, 123, 131, 133, 141, 143 Motor 122, 124 Torque meter 132, 134 Ammeter 142, 144 Thermometer I1, I2 Current T1, T2 Measurement torque value i1, i2 Measurement current value t1, t2 Measurement temperature value

Claims (4)

A twin-drum continuous casting machine having a pair of cooling drums and drawing a slab from the cooling drum;
Based on the drum driving load of the first cooling drum that is one of the pair of cooling drums and the drum driving load of the second cooling drum that is the other of the pair of cooling drums, A control device for controlling at least one of the rotational speed of the first motor that drives the first cooling drum and the rotational speed of the second motor that drives the second cooling drum;
A twin-drum continuous casting facility characterized by comprising: A twin-drum continuous casting machine having a pair of cooling drums and drawing a slab from the cooling drum;
Based on the drum temperature of the first cooling drum that is one of the pair of cooling drums and the drum temperature of the second cooling drum that is the other of the pair of cooling drums, the first A control device for controlling at least one of the rotational speed of the first motor that drives the cooling drum and the rotational speed of the second motor that drives the second cooling drum;
A twin-drum continuous casting facility characterized by comprising: In a continuous casting facility having a pair of cooling drums and having a twin-drum continuous casting machine that draws a slab from the cooling drum,
The difference between the drum driving load of the first cooling drum that is one of the pair of cooling drums and the drum driving load of the second cooling drum that is the other of the pair of cooling drums is: Control at least one of the number of rotations of the first motor that drives the first cooling drum and the number of rotations of the second motor that drives the second cooling drum so that the preset drum driving load difference is set. A continuous casting method characterized by that. In a continuous casting facility having a pair of cooling drums and having a twin-drum continuous casting machine that draws a slab from the cooling drum,
The difference between the drum temperature of the first cooling drum that is one of the pair of cooling drums and the drum temperature of the second cooling drum that is the other of the pair of cooling drums is preset. And controlling at least one of the number of rotations of the first motor driving the first cooling drum and the number of rotations of the second motor driving the second cooling drum so that the set temperature difference is achieved. Continuous casting method.

Images