JP2010253480A - Twin roll type continuous casting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a twin roll type continuous casting apparatus which can suppress bulging generated in a slab. <P>SOLUTION: The twin roll type continuous casting apparatus is provided with: a fixed roll 1 rotating at a fixed position; a moving roll 2 moving to a direction approaching or separating to the fixed roll 1 and rotating to a direction reverse to the fixed roll; and side weirs 4 installed at both the edge parts in the axial direction of the fixed roll 1 and the moving roll 2, and holding molten metal, wherein a slab 6 is cast in a state where unsolidified part remains at the inside. At least one wedge-shaped support block 7, 8 pressing the slab 6 and at least one support block driving mechanism 9 or an elastic pressing means moving the support block 7 installed in the side of the moving roll 2 to the thickness direction of the slab 6 and pressing the slab 6 by the support block 7 are provided on the part directly below the minimum gap between the fixed roll 1 and the moving roll 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a twin roll type continuous casting apparatus.

  Conventionally, the outer surface of the slab is supported by a support roll or the like in order to avoid problems such as internal cracking due to bulging deformation in which the slab is deformed by the static pressure of the molten steel remaining inside, or the occurrence of breakout.

JP 2006-175488 A

However, in the bag binding twin roll continuous casting method, the space is small just below the minimum gap between the rolls, and it is difficult to install the support roll.
In addition, as in Patent Document 1, there is an example in which bulging is suppressed by installing a wedge-shaped block instead of the support roll directly below the minimum gap between the rolls, but the block is simply installed. Therefore, it is difficult to effectively suppress bulging.

  For example, in the double-roll continuous casting method for bag binding, the thickness of the slab is determined by the thickness of the solidified shell at the minimum gap between the rolls. As the thickness of the steel sheet fluctuates, there is a problem that a gap is formed between the slab and the block or the slab is clogged between the blocks.

  From the above, the present invention follows that the wedge-shaped support block follows and presses the fluctuation of the thickness of the slab that occurs during the twin-roll type continuous casting, so that the casting is cast between the slab and the support block. Prevents the slab from being able to support the slab due to a gap wider than the thickness of the slab, or conversely, prevents the slab from clogging due to a gap narrower than the slab thickness between the slab and the support block. It aims at providing the twin roll type continuous casting apparatus which can suppress effectively the bulging produced in a slab by doing.

The twin roll type continuous casting apparatus according to the first invention for solving the above-mentioned problems is
A fixed roll that rotates at a fixed position, a moving roll that moves in a direction approaching or leaving the fixed roll, and that rotates in a direction opposite to the fixed roll, and axial ends of the fixed roll and the movable roll. In the twin roll type continuous casting apparatus comprising a side weir for holding molten metal and casting a slab in a state where an unsolidified portion remains inside,
At least one wedge-shaped support block that presses the slab directly under a minimum gap between the fixed roll and the moving roll;
And at least one pressing means for moving the support block in the thickness direction of the slab and pressing the slab with the support block.

The twin roll type continuous casting apparatus according to the second invention for solving the above-mentioned problems is the twin roll type continuous casting apparatus according to the first invention,
The pressing means presses a solidified portion formed at an end portion in the width direction of the slab to position the support block.

The twin roll type continuous casting apparatus according to the third invention for solving the above-mentioned problems is the twin roll type continuous casting apparatus according to the first invention,
Control means for controlling the pressing means,
The control means sets the pressing force of the pressing means within a range in which the force generated by the molten steel static pressure in the unsolidified portion is the lower limit, and the upper limit is the force obtained by adding the load resistance of the end face of the slab to the lower limit. It is characterized by doing.

A twin-roll continuous casting apparatus according to a fourth invention for solving the above-described problems is a twin-roll continuous casting apparatus according to the second invention.
Control means for controlling the pressing means,
The control means sets a pressing force of the pressing means within a range in which a force generated by a molten steel static pressure in the unsolidified portion is a lower limit and a force obtained by adding a load resistance of the solidified portion to the lower limit is an upper limit. It is characterized by.

The twin roll type continuous casting apparatus according to the fifth invention for solving the above-mentioned problems is the twin roll type continuous casting apparatus according to the first invention or the second invention,
Control means for controlling the pressing means;
A support roll that is a roll for supporting the slab;
And at least one position detector for detecting the position of the moving roll and the support roll,
The control unit is configured to use the pressing unit by using the position detection result of either the moving roll position detector or the support roll position detector, or the position detection result of both the moving roll position detector and the support roll position detector. It is characterized by controlling.

  According to the present invention, the wedge-shaped support block follows and presses following the fluctuation of the thickness of the slab that occurs during twin-roll continuous casting, so that the thickness of the slab is between the slab and the support block. Effectively eliminates bulging that occurs in the slab by preventing a wider gap, or conversely, a gap narrower than the slab thickness between the slab and the support block, resulting in clogging of the slab. A twin-roll continuous casting apparatus that can be suppressed can be provided.

It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 1st Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on 1st Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 2nd Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on the 2nd Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 3rd Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on the 3rd Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 4th Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on the 4th Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 5th Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on the 5th Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 6th Example of this invention. It is the schematic diagram which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on the 6th Example of this invention. It is the schematic diagram which showed the force which acts on the slab in the twin roll type continuous casting apparatus which concerns on the 7th Example of this invention. It is the flowchart which showed the control content of the control apparatus in the twin roll type continuous casting apparatus which concerns on the 7th Example of this invention. It is the schematic diagram which showed the force which acts on the slab in the twin roll type continuous casting apparatus which concerns on the 8th Example of this invention. It is the flowchart which showed the control content of the control apparatus in the twin roll type continuous casting apparatus which concerns on the 8th Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 9th Example of this invention. It is the figure which showed the position command value to a support block drive device in the twin roll type continuous casting apparatus which concerns on the 9th Example of this invention. It is the schematic diagram which showed the structure of the twin roll type continuous casting apparatus which concerns on the 10th Example of this invention. It is the figure which showed the position command value to a support block drive device in the twin roll type continuous casting apparatus which concerns on the 10th Example of this invention. It is the figure which showed the position command value to a support block drive device in the twin roll type continuous casting apparatus based on the 11th Example of this invention.

  Hereinafter, the form for implementing the twin roll type continuous casting apparatus which concerns on this invention is demonstrated, referring drawings.

A first embodiment of a twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 1 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to a first embodiment of the present invention. 1A is a side view showing the configuration of the twin roll type continuous casting apparatus according to the first embodiment of the present invention, and FIG. 1B is related to the first embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the twin roll type continuous casting apparatus.

  FIG. 2 is a schematic view showing the configuration of the main part of the twin-roll continuous casting apparatus according to the first embodiment of the present invention. 2 (a) is a side view showing the configuration of the main part of the twin-roll continuous casting apparatus according to the first embodiment of the present invention, and FIG. 2 (b) is the first embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 1 and 2, in the twin roll type continuous casting apparatus according to the present embodiment, one of the two rolls is fixed as a fixed roll 1 at a fixed position. The other roll can be moved as a moving roll 2 in a direction approaching or leaving the fixed roll 1 by a moving roll driving mechanism 3.

  The fixed roll 1, the moving roll 2, and the side weir 4 form a hot water reservoir 5 where molten metal is stored. Convex portions 1 a are formed at both ends of the surface of the fixed roll 1. In addition, illustration of the side dam 4 is abbreviate | omitted in Fig.1 (a). And the slab 6 is discharged | emitted below in the state in which the unsolidified part 6a remains inside the slab 6 by the fixed roll 1 and the moving roll 2 reversing mutually.

  In this embodiment, convex portions 1a are formed at both ends of the surface of the fixed roll 1 and the surface of the moving roll 2 is flat. However, the convex portions are formed at both ends of the surfaces of the fixed roll 1 and the moving roll 2. Even in the case of forming slab, the slab 6 can be basically cast in the same manner.

  Immediately below the minimum gap between the fixed roll 1 and the movable roll 2, two wedge-shaped support blocks 7 and 8 that press the slab 6 are provided so as to sandwich the slab 6. A support block drive mechanism 9 that moves the support block 7 in the thickness direction of the slab 6 and presses the slab 6 is installed on the support block 7 installed on the moving roll 2 side. The moving roll drive mechanism 3 and the support block drive mechanism 9 are controlled by the control device 15.

  The support block drive mechanism 9 is fixed to the frame 11. In this embodiment, the support block drive mechanism 9 is driven by a pneumatic cylinder, a hydraulic cylinder, a motor or the like. Further, the support block 8 installed on the fixed roll 1 side is fixed to the frame 12. The slab 6 is supported by the support roll 10 after passing between the support blocks 7 and 8.

  The pressing force by which the support block 7 presses the slab 6 by the support block drive mechanism 9 is set in advance when a pneumatic cylinder and a hydraulic cylinder are used, and when a motor is used, a current value is set in advance. Alternatively, it may be set by measuring the pressing force with a load cell or the like and performing feedback control or by controlling the position of the support block 7.

  According to the twin roll type continuous casting apparatus according to the present embodiment, the support block 7 on the moving roll 2 side moves on the basis of the fixed roll 1 side with respect to the variation in the thickness of the slab 6, and the thickness of the slab 6. By following this variation, the slab 6 can be pressed at an optimum position. Thereby, the bulging which arises in the slab 6 can be suppressed effectively.

A second embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 3 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to the second embodiment of the present invention.
FIG. 4 is a schematic diagram showing the configuration of the main part of the twin-roll continuous casting apparatus according to the second embodiment of the present invention. FIG. 4 (a) is a side view showing the configuration of the main part of the twin roll type continuous casting apparatus according to the second embodiment of the present invention, and FIG. 4 (b) is the second embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 3 and 4, the twin roll type continuous casting apparatus according to the present embodiment is different from the first embodiment in that the support block 7 installed on the moving roll 2 side has a thickness direction of the slab 6. An elastic body 13 such as a spring that moves and presses the slab 6 is installed. The pressing force by which the support block 7 presses the slab 6 by the elastic body 13 is selected by selecting a spring constant and a spring installation position so as to be a required pressing force when a spring is used for the elastic body 13. deep.

  In addition, the twin roll type continuous casting apparatus according to this embodiment has the same configuration as that of the twin roll type continuous casting apparatus according to the first embodiment except that the elastic body 13 is used.

  According to the twin roll type continuous casting apparatus according to the present embodiment, the support block 7 on the moving roll 2 side moves on the basis of the fixed roll 1 side with respect to the variation in the thickness of the slab 6, and the thickness of the slab 6. By following this variation, the slab 6 can be pressed at an optimum position. Thereby, the bulging which arises in the slab 6 can be suppressed effectively.

A third embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 5 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to a third embodiment of the present invention.
FIG. 6 is a schematic view showing the configuration of the main part in the twin-roll continuous casting apparatus according to the third embodiment of the present invention. FIG. 6 (a) is a side view showing the configuration of the main part of a twin roll type continuous casting apparatus according to the third embodiment of the present invention, and FIG. 6 (b) is the third embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 5 and 6, the twin roll type continuous casting apparatus according to the present embodiment is different from the first embodiment in that the support block 7 is arranged along the circumferential direction of the fixed roll 1, and the fixed roll 1. The support roll 10 is disposed along the circumferential direction, and the slab 6 is wound around the fixed roll 1 to cast the slab 6.

  In addition, the twin roll type continuous casting apparatus according to the present embodiment is configured such that the support block 7 is disposed along the circumferential direction of the fixed roll 1 and the support roll 10 is disposed along the circumferential direction of the fixed roll 1. These are the apparatus structures similar to the twin roll type continuous casting apparatus which concerns on a 1st Example.

  According to the twin roll type continuous casting apparatus according to the present embodiment, in addition to the effect of the twin roll type continuous casting apparatus according to the first embodiment, it is also possible to apply when the vertical space cannot be secured. .

A fourth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 7 is a schematic view showing the configuration of a twin-roll continuous casting apparatus according to the fourth embodiment of the present invention.
FIG. 8 is a schematic view showing the configuration of the main part of the twin-roll continuous casting apparatus according to the fourth embodiment of the present invention. FIG. 8A is a side view showing the configuration of the main part of a twin-roll continuous casting apparatus according to the fourth embodiment of the present invention, and FIG. 8B is the fourth embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 7 and 8, in the twin roll type continuous casting apparatus according to this embodiment, unlike the third embodiment, the support block drive mechanism 9 is fixed to a frame 11 installed on the fixed roll 1 side. ing. The support block drive mechanism 9 presses the support block 7 against the slab 6 in such a manner that it is pulled from the fixed roll 1 side.

  The twin roll type continuous casting apparatus according to the present embodiment has the same apparatus configuration as the twin roll type continuous casting apparatus according to the third embodiment except that the support block drive mechanism 9 is installed on the fixed roll 1 side. It is.

  According to the twin roll type continuous casting apparatus according to the present embodiment, in addition to the effect of the twin roll type continuous casting apparatus according to the first embodiment, it is also possible to apply when the vertical space cannot be secured. .

A fifth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 9 is a schematic view showing the configuration of a twin-roll continuous casting apparatus according to the fifth embodiment of the present invention.
FIG. 10 is a schematic diagram showing the configuration of the main part of a twin-roll continuous casting apparatus according to the fifth embodiment of the present invention. FIG. 10 (a) is a side view showing the configuration of the main part of a twin-roll continuous casting apparatus according to the fifth embodiment of the present invention, and FIG. 10 (b) is the fifth embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 9 and 10, the twin roll type continuous casting apparatus according to the present embodiment is different from the first embodiment in that the convex portion 8 a is formed on the support block 8 and the solidified portion of the slab 6. The end 6c in the direction is pressed by the support block 7, and the support block 7 is positioned.

  In the twin roll type continuous casting apparatus according to the present embodiment, the support block 8 is formed with the convex portion 8a, and the support block 7 presses the end portion 6c in the width direction which is a solidified portion of the slab 6. 7 is the same as that of the twin roll type continuous casting apparatus according to the first embodiment except that the positioning of 7 is performed.

  According to the twin roll type continuous casting apparatus according to the present embodiment, it is supported by pressing at the end portion 6c in the width direction of the slab 6 having a higher load resistance than the twin roll type continuous casting apparatus according to the first embodiment. By positioning the block 7, stable pressing by the support block 7 is possible. Thereby, the bulging which arises in the slab 6 can be suppressed effectively.

A sixth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 11 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to the sixth embodiment of the present invention.
FIG. 12 is a schematic diagram showing the configuration of the main part of a twin-roll continuous casting apparatus according to the sixth embodiment of the present invention. FIG. 12 (a) is a side view showing the configuration of the main part of a twin-roll continuous casting apparatus according to the sixth embodiment of the present invention, and FIG. 12 (b) is the sixth embodiment of the present invention. It is the top view seen from the upper part which showed the structure of the principal part in the twin roll type continuous casting apparatus which concerns on an example.

  As shown in FIGS. 11 and 12, the twin roll type continuous casting apparatus according to the present embodiment is different from the fifth embodiment in that the support block 7 is arranged along the circumferential direction of the fixed roll 1, and the fixed roll 1. The support roll 10 is disposed along the circumferential direction, and the slab 6 is wound around the fixed roll 1 to cast the slab 6.

  According to the twin roll type continuous casting apparatus according to the present embodiment, in addition to the effect of the twin roll type continuous casting apparatus according to the fifth embodiment, it is also possible to apply when the vertical space cannot be secured. .

A seventh embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 13 is a schematic view showing the force acting on the slab in the twin-roll continuous casting apparatus according to the seventh embodiment of the present invention. In addition, the twin roll type continuous casting apparatus according to the present embodiment has the same device configuration as the twin roll type continuous casting apparatus according to the first embodiment.

As shown in FIG. 13, the end surface 6b of the slab 6 is caused by the hydrostatic pressure generated by the unsolidified portion 6a of the slab 6 indicated by the arrow F _S in FIG. 13 from the pressing force indicated by the arrow F in FIG. The force minus the force acts. For this reason, in the twin roll type continuous casting apparatus according to the present embodiment, the pressing force for pressing the slab 6 by the support block 7 is caused by the static pressure of the molten steel by the unsolidified molten steel remaining in the unsolidified portion 6a of the slab 6. The generated force is set as a lower limit, and the upper limit is set to a force obtained by adding the load resistance of the end face 6b of the slab 6 to the lower limit.

Next, the content of control by the control device 15 in the twin roll type continuous casting apparatus according to the present embodiment will be described.
FIG. 14 is a flowchart showing the contents of control by the control device 15 in the twin-roll continuous casting apparatus according to the seventh embodiment of the present invention.

ここで、溶鋼密度は鋳片６の未凝固部６ａの密度、溶鋼ヘッドはサポートブロック７の位置から見た湯溜り部５（図１参照）の液面の高さ、サポートブロック面積とはサポートブロック７の鋳片６を押圧する面積を意味する。
すなわち、必要押圧力は溶鋼静圧にサポートブロック７の面積を乗じることにより算出する。 As shown in FIG. 14, the twin roll type continuous casting apparatus according to the present embodiment uses the following formula (in the step P10 as a minimum pressing force required to press the slab 6 with the support block 7 as a required pressing force: Estimated from 1) and (2).

Here, the molten steel density is the density of the unsolidified portion 6a of the slab 6, the molten steel head is the height of the liquid surface of the puddle portion 5 (see FIG. 1) viewed from the position of the support block 7, and the support block area is the support It means the area where the slab 6 of the block 7 is pressed.
That is, the required pressing force is calculated by multiplying the molten steel static pressure by the area of the support block 7.

すなわち、端面耐荷重は、端面６ｂの面積（図１３中に矢印Ｔ_fで示す凝固シェル厚にサポートブロック７の鋳造方向の長さを乗じた値）に鋳片６の材料耐力を乗じることにより算出する。 In Step P11, the load resistance of the end face 6b of the slab 6 is estimated as the end face load resistance from the following formula (3).

That is, the end face load resistance is obtained by multiplying the area of the end face 6b (the value obtained by multiplying the solidified shell thickness indicated by the arrow _Tf in FIG. 13 by the length in the casting direction of the support block 7) with the material yield strength of the slab 6. calculate.

すなわち、鋳片６の端面６ｂに働く荷重は、必要押圧力に溶鋼静圧による力を差し引いた力であり、上記の上限以下であれば端面６ｂは潰れることなく、安定した押圧が可能になる。 In Step P12, the pressing force for moving the support block 7 by the support block driving mechanism 9 and pressing the slab 6 is set as the set pressing force from the following formula (4).

That is, the load acting on the end surface 6b of the slab 6 is a force obtained by subtracting the force due to the molten steel static pressure from the required pressing force, and if it is equal to or less than the above upper limit, the end surface 6b is not crushed and can be stably pressed. .

  According to the twin roll type continuous casting apparatus according to the present embodiment, in the twin roll type continuous casting apparatus according to the first embodiment, stable pressing of the slab 6 by the support block 7 by the setting of the above set pressing force. Is possible.

An eighth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 15 is a schematic view showing the force acting on the slab in the twin-roll continuous casting apparatus according to the eighth embodiment of the present invention. In addition, the twin roll type continuous casting apparatus according to the present embodiment has the same device configuration as the twin roll type continuous casting apparatus according to the fifth embodiment.

As shown in FIG. 15, the end surface 6b of the slab 6 is caused by the hydrostatic pressure generated by the unsolidified portion 6a of the slab 6 shown by the arrow F _S in FIG. 15 from the pressing force shown by the arrow F in FIG. The force minus the force acts. For this reason, in the twin roll type continuous casting apparatus according to the present embodiment, the pressing force for pressing the slab 6 by the support block 7 is caused by the static pressure of the molten steel by the unsolidified molten steel remaining in the unsolidified portion 6a of the slab 6. The generated force is set as a lower limit, and the upper limit is set to a force obtained by adding a load resistance of the end portion 6c which is a solidified portion of the slab 6 to the lower limit.

Next, the content of control by the control device 15 in the twin roll type continuous casting apparatus according to the present embodiment will be described.
FIG. 16 is a flowchart showing the contents of control by the control device 15 in the twin roll type continuous casting apparatus according to the eighth embodiment of the present invention.

ここで、溶鋼密度は鋳片６の未凝固部６ａの密度、溶鋼ヘッドはサポートブロック７の位置から見た湯溜り部５（図１参照）の液面の高さ、サポートブロック面積とはサポートブロック７の鋳片６を押圧する面積を意味する。
すなわち、必要押圧力は溶鋼静圧にサポートブロック７の面積を乗じることにより算出する。 As shown in FIG. 16, the twin roll continuous casting apparatus according to the present embodiment has the following formula (Step (P20)) with the minimum pressing force required to press the slab 6 by the support block 7 as the required pressing force. Estimated from 5) and (6).

Here, the molten steel density is the density of the unsolidified portion 6a of the slab 6, the molten steel head is the height of the liquid surface of the puddle portion 5 (see FIG. 1) viewed from the position of the support block 7, and the support block area is the support It means the area where the slab 6 of the block 7 is pressed.
That is, the required pressing force is calculated by multiplying the molten steel static pressure by the area of the support block 7.

すなわち、端部耐荷重は、幅方向の端部６ｃの面積（図１５中に矢印Ｔ_pで示す端部６ｃの幅にサポートブロック７の鋳造方向の長さを乗じた値）に鋳片６の材料耐力を乗じることにより算出する。 Further, in the block 21, the load resistance of the end portion 6c of the slab 6 is estimated as the end load resistance from the following formula (7).

That is, the end portion load capacity, slab in the area of the width direction of the end portion 6c (a value obtained by multiplying the length of the casting direction of the support block 7 on the width of the end portion 6c of the arrow T _p in FIG. 15) 6 Calculated by multiplying the material yield strength of

すなわち、鋳片６の端部６ｃに働く荷重は、必要押圧力に溶鋼静圧による力を差し引いた力であり、上記の上限以下であれば端部６ｃは潰れることなく、安定した押圧が可能になる。 Moreover, in step P22, the support block 7 is moved by the support block drive mechanism 9, and the pressing force which presses the slab 6 is set from the following formula (8) as the set pressing force.

That is, the load acting on the end 6c of the slab 6 is a force obtained by subtracting the force due to the molten steel static pressure from the required pressing force, and if it is below the above upper limit, the end 6c is not crushed and can be stably pressed. become.

  According to the twin roll type continuous casting apparatus according to the present embodiment, in the twin roll type continuous casting apparatus according to the fifth embodiment, stable pressing of the slab 6 by the support block 7 by setting the above set pressing force. Is possible.

A ninth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 17 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to the ninth embodiment of the present invention.
As shown in FIG. 17, the twin roll continuous casting apparatus according to the present embodiment approaches or leaves the first support roll 10-1 closest to the support block 7 among the plurality of support rolls 10. Support roll drive mechanisms 14-1 and 14-2 that move in the direction are provided.

  The moving roll drive mechanism 3 is provided with a moving roll position detector 3a, and the support roll drive mechanism 14-1 closer to the support block 7 is provided with a support roll position detector 14-1a. And the position of the support block 7 is determined using the position detection result by the moving roll position detector 3a and the support roll position detector 14-1a.

  The twin roll type continuous casting apparatus according to the present embodiment is the same as the third embodiment except that the support roll drive mechanism 14, the moving roll position detector 3a, and the support roll position detector 14-1a are provided. It is the apparatus structure similar to the twin roll type continuous casting apparatus.

FIG. 18 is a diagram showing position command values to the support block driving device in the twin-roll continuous casting device according to the ninth embodiment of the present invention.
As shown in FIG. 18, the displacement amount in the thickness direction of the slab 6 of the moving roll 2 and the support roll 10 is measured by the moving roll position detector 3a and the support roll position detector 14-1a, and the casting direction of the slab 6 is measured. 18 in the thickness direction of the slab 6 of the moving roll 2 indicated by A in FIG. 18 and the thickness of the slab 6 of the first support roll 10-1 indicated by B in FIG. A position command is given to the support block drive mechanism 9 as shown by an arrow C in FIG. 18 so that the direction position is a straight line.

When this is formulated, the position command value _xb to the support block drive mechanism 9 can be expressed by the following formula (9).

Here, X _b is the support block driving mechanism 9 position instruction value f, X _r is a position measurement value of the moving roll position detectors 3a, x _sr support roll position detector position measurement value 14-1a, L _bsr is The distance between the pressing position of the support block drive mechanism 9 indicated by arrow α in FIG. 17 and the pressing position of the support roll 10-1 indicated by arrow β in FIG. 17, L _rb is a moving roll indicated by arrow γ in FIG. 2 is a distance between the pressing position of 2 and the pressing position of the support block drive mechanism 9 indicated by an arrow α in FIG.

  According to the twin roll type continuous casting apparatus according to the present embodiment, it is possible to cope with an unexpected load as compared with the twin roll type continuous casting apparatus according to the first embodiment.

A tenth embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
FIG. 19 is a schematic diagram showing the configuration of a twin-roll continuous casting apparatus according to the tenth embodiment of the present invention.
As shown in FIG. 19, the twin roll type continuous casting apparatus according to the present embodiment includes a plurality of support block driving devices 9-1 and 9-2. And the position of the support block 7 is determined using the position detection result by the moving roll position detector 3a and the support roll position detector 14-1a. In addition, the twin roll type continuous casting apparatus according to the present embodiment is the same as the twin roll type continuous casting apparatus according to the ninth embodiment, except that a plurality of support block driving devices 9-1 and 9-2 are provided. It is the same device configuration.

FIG. 20 is a diagram showing a movement command value to the support block driving device in the twin-roll continuous casting device according to the tenth embodiment of the present invention.
As shown in FIG. 20, the thickness of the slab 6 of the movable roll 2 indicated by A in FIG. In FIG. 20, arrows C ₁ and C ₂ are respectively arranged so that the position in the vertical direction and the position in the thickness direction of the cast piece 6 of the first support roll 10-1 indicated by B in FIG. As shown, the position command is given to the support block driving devices 9-1 and 9-2.

When formulated this position command value x _b1, x _b2 of the support block driving device 9-1 and 9-2 f the following formula (10) can be expressed by (11).

Here, x _bi is a position command value to the support block driving device 9-i, x _r is a position measurement value of the moving roll position detector 3a, x _sr is a position measurement value of the support roll position detector 14-1a, L _bsri is the distance between the pressing position of the support block driving device 9-i indicated by arrow α-i in FIG. 19 and the pressing position of the support roll 10-1 indicated by arrow β in FIG. 19, and L _rbi is in FIG. This is the distance between the pressing position of the moving roll 2 indicated by the arrow γ and the pressing position of the support block driving device 9-i indicated by the arrow α-i in FIG. Note that i is a subscript representing 1 or 2.

  According to the twin roll type continuous casting apparatus according to the present embodiment, it is possible to cope with an unexpected load as compared with the twin roll type continuous casting apparatus according to the first embodiment. In the present embodiment, the configuration including the support block driving devices 9-1 and 9-2 is shown, but it is possible to install more support block driving devices.

An eleventh embodiment of the twin roll type continuous casting apparatus according to the present invention will be described.
In addition, the twin roll type continuous casting apparatus according to the present embodiment has the same device configuration as the twin roll type continuous casting apparatus according to the ninth embodiment.

FIG. 21 is a diagram showing command values to the support block driving device in the twin-roll continuous casting device according to the eleventh embodiment of the present invention.
As shown by D in FIG. 21, the displacement amount of the moving roll 2 was measured using the moving roll position detector 3a, and calculated from the distance in the casting direction between the moving roll 2 and the slab 6 of the support block 7 and the casting speed. A position command is given to the support block drive mechanism 9 as indicated by E in FIG. 21 so that the support block 7 is positioned at that position after the time difference ΔT.

ここで、Ｘ_bはサポートブロック駆動機構９ヘの位置指令値、Ｘ_rは移動ロール位置検出器３ａの位置計測値、Ｌは鋳造長、Ｌ_rbは移動ロール２とサポートブロック駆動機構９との距離である。 Since the time difference ΔT depends on the casting speed, in the case of non-steady casting (when the casting speed changes), the time difference ΔT is not constant, and therefore it can be expressed by the following formula (12) if it is determined by the casting distance. it can.

Here, X _b is the support block driving mechanism 9 position instruction value f, X _r is a position measurement value of the moving roll position detectors 3a, L casting length, L _rb is the mobile roll 2 and the support block drive mechanism 9 Distance.

ここで、Ｖ_cは鋳造速度である。 The casting length L is given by the following formula (13).

Here, V _c is a casting speed.

Then, by storing the position measurement value of the moving roll position detector 3a, a position command is output to the support block drive mechanism 9 in a form delayed by the casting length _Lrb from the position measurement value of the moving roll 2.
According to the twin roll type continuous casting apparatus according to the present embodiment, it is possible to cope with an unexpected load as compared with the twin roll type continuous casting apparatus according to the first embodiment.

  As described above, the present invention includes the fixed roll 1 that rotates at a fixed position, the moving roll 2 that moves in the direction approaching or leaving the fixed roll 1, and that rotates in the opposite direction to the fixed roll 1, the fixed roll 1, and Fixed in a twin-roll continuous casting apparatus that includes side weirs 4 that are installed at both ends in the axial direction of the moving roll 2 and holds molten metal, and casts the slab 6 with the unsolidified portion 6a remaining therein. Immediately below the minimum gap between the roll 1 and the moving roll 2, at least one wedge-shaped support blocks 7 and 8 that press the slab 6 and the support block 7 are moved in the thickness direction of the slab 6 to support this. By providing at least one support block drive mechanism 9 for pressing the slab 6 with the block 7 or pressing means comprising the elastic body 13, the fixed roll 1 against the variation in the thickness of the slab 6. Moving roll 2 side of the support block 7 is moved as a reference, it follows the variation of the thickness of the slab 6 can be pressed at the optimum position billet 6. Thereby, the bulging which arises in the slab 6 can be suppressed effectively.

  Further, the pressing means presses the solidified portion formed at the end portion 6c in the width direction of the slab 6 to position the support block 7, thereby the end portion 6c in the width direction of the slab 6 having a high load resistance. Since the support block 7 is positioned by pressing in step S2, the support block 7 can be stably pressed. Thereby, the bulging which arises in the slab 6 can be suppressed effectively.

  Moreover, the control means which consists of the control apparatus 15 which controls a press means is provided, and a control means makes the force which arises by the molten steel static pressure in the unsolidified part 6a as a minimum, and adds the load resistance of the end surface 6b of the slab 6 to this minimum By setting the pressing force of the pressing means within a range where the upper limit is the upper limit, stable pressing of the slab 6 by the support block 7 becomes possible.

  Moreover, the control means which consists of the control apparatus 15 which controls a press means is provided, and a control means makes upper limit the force which made the force which arises by the molten steel static pressure in the unsolidified part 6a, and added the load resistance of the solidification part to this minimum. By setting the pressing force of the pressing means within the range, the slab 6 can be stably pressed by the support block 7.

  Moreover, the control means which consists of the control apparatus 15 which controls a press means, the support roll 10-1 which is a roll which supports the slab 6, and at least 1 position which detects the position of the movement roll 2 and the support roll 10-1 Detectors 3a and 14-1a, and the control means is either the moving roll position detector 3a or the support roll position detector 14-1a, or the moving roll position detector 3a and the support roll position detector 14. By controlling the pressing means using both of the position detection results of -1a, it is possible to cope with an unexpected load.

  Therefore, according to the present invention, the wedge-shaped support block 7 follows and presses following the variation in the thickness of the slab 6 that occurs during the twin roll type continuous casting, whereby the slab 6 and the support blocks 7, 8. A gap wider than the thickness of the slab 6 is generated between the slab 6 and a gap narrower than the thickness of the slab 6 is formed between the slab 6 and the support blocks 7 and 8 and the slab 6 is clogged. By preventing this, it is possible to provide a twin-roll continuous casting apparatus that can effectively suppress bulging that occurs in the slab 6.

  The present invention can be used, for example, in a twin roll type continuous casting apparatus.

DESCRIPTION OF SYMBOLS 1 Fixed roll 2 Moving roll 3 Moving roll drive mechanism 3a Moving roll position detector 4 Side dam 5 Reservoir part 6 Cast piece 6a Unsolidified part 6b of cast piece End face 6c of cast piece End part 7, 8 of cast piece Support block DESCRIPTION OF SYMBOLS 9 Support block drive mechanism 10 Support roll 10-1 1st support roll 11, 12 Frame 13 Elastic body 14-1, 14-2 Support roll drive mechanism 14-1a Support roll position detector 15 Control apparatus

Claims (5)

A fixed roll that rotates at a fixed position, a moving roll that moves in a direction approaching or leaving the fixed roll, and that rotates in a direction opposite to the fixed roll, and axial ends of the fixed roll and the movable roll. In the twin roll type continuous casting apparatus comprising a side weir for holding molten metal and casting a slab in a state where an unsolidified portion remains inside,
At least one wedge-shaped support block that presses the slab directly under a minimum gap between the fixed roll and the moving roll;
A twin roll type continuous casting apparatus comprising: at least one pressing means for moving the support block in the thickness direction of the slab and pressing the slab with the support block. 2. The twin-roll continuous casting apparatus according to claim 1, wherein the pressing unit presses a solidified portion formed at an end portion in a width direction of the slab to position the support block. Control means for controlling the pressing means,
The control means sets the pressing force of the pressing means within a range in which the force generated by the molten steel static pressure in the unsolidified portion is the lower limit, and the upper limit is the force obtained by adding the load resistance of the end face of the slab to the lower limit. The twin-roll continuous casting apparatus according to claim 1, wherein Control means for controlling the pressing means,
The control means sets a pressing force of the pressing means within a range in which a force generated by a molten steel static pressure in the unsolidified portion is a lower limit and a force obtained by adding a load resistance of the solidified portion to the lower limit is an upper limit. The twin roll type continuous casting apparatus according to claim 2. Control means for controlling the pressing means;
A support roll that is a roll for supporting the slab;
And at least one position detector for detecting the position of the moving roll and the support roll,
The control unit is configured to use the pressing unit by using the position detection result of either the moving roll position detector or the support roll position detector, or the position detection result of both the moving roll position detector and the support roll position detector. The twin roll type continuous casting apparatus according to claim 1 or 2, wherein the control is performed.

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