JPH02211944A - Roll type continuous casting equipment - Google Patents

Abstract

PURPOSE:To prevent the development of crack in a cast strip and to enable stable coiling by controlling revolutional speed of each motor based on the specific mutual relation of each revolutional speed of cooling rolls, rolling device and coiling roll. CONSTITUTION:Molten metal 8 in a tundish 7 is supplied into gap between the cooling rolls 3, 4 through a core 6, and under condition of forming pouring basin, the revolutional speed VA of the cooling rolls 3, 4 preset to a setter 16 is inputted to an arithmetic unit 17. In this arithmetic unit 17, the revolutional speed VB of the rolling device 11 and the revolutional speed VC of the coiling roll 13 are calculated so as to satisfy the functional relation of VB=VA-betaV (betaV>0) and the relation of VC=VB+alphaV (alphaV>0). Command signal is outputted to each motor 1, 2 and 10, 12, from a revolutional speed control unit 18 based on each revolutional speed VA, VB, VC, and the revolutional speeds of the cooling rolls 3, 4, rolling device 11 and coiling roll 13 are controlled.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to roll type continuous casting equipment.

[Prior Art] Generally, as shown in FIG. 2, an A-R type continuous casting facility uses two cooling rolls 3.4, which are rotationally driven by a motor 1.2, arranged horizontally and in parallel at a required distance. Side weirs 5 are provided at both ends of the cooling rolls 3.4, and a tundish 7 with a core 6 integrally fixed to the bottom surface is provided above the cooling rolls 3.4. , the molten metal 8 in the tundish 7 is passed through the core B to the cooling port 3,
4 to form a pool of hot water, and the motor 1.
At step 2, the cooling roll 3.4 is rotated and the cooling roll 3.4 is rotated.
4, the molten metal 8 is cooled and drawn out as a slab 9;
The slab 9 is moved by a roll device 11 driven by a motor IO.
A winding roll 1 driven by a motor 12 via
The film is wound onto a winding machine 14 equipped with a winder 3.

In addition, in the figure, 15 indicates a gear box.

[Problems to be Solved by the Invention] However, in the conventional roll-type continuous casting equipment as described above, since each motor 1.2 and 10.12 is driven in a random manner, the rotational speed of the roll device 11 is If the rotation speed of the cooling roll is greater than 3°4,
A tensile force acts on the slab 9 immediately after solidification, and cracks may occur in the slab 9. Also, if the rotation speed of the roll device 11 becomes higher than the rotation speed of the take-up roll 13, Problems such as the inability to properly wind the slab 9 on the tip 4 of the winding machine have occurred.Furthermore, there is no good equipment that can measure in-line the tensile and compressive forces acting on the slab 9, and the operating condition is extremely poor. It was unstable.

In view of these circumstances, the present invention aims to provide a roll-type continuous casting equipment that can prevent cracks from occurring in slabs and stably wind them.

[Means for Solving the Problems] The present invention includes cooling rolls arranged horizontally and parallelly at a required interval, a motor for rotationally driving the cooling rolls, and a motor installed above the cooling rolls for cooling the rolls. A tundish for supplying molten metal between the rolls, a winding roll provided on the outlet side of the cooling roll for winding up the slab drawn out from between the cooling rolls, and a winding roll for rotationally driving the winding roll. In a roll type continuous casting equipment comprising a motor, a roll device disposed between the cooling roll and the winding roll and guiding the slab to the winding roll side, and a motor for rotationally driving the roll device. a setting device for setting the rotational speed UA of the cooling roll, and a rotational speed ``UB'' of the roll device based on the rotational speed ``A'' of the cooling roll set by the setting device and a rotational speed ``■'' of the winding roll.
C respectively as ■B=■A−■A−βV(βv〉0) and “U
A calculation device that determines the relationship c-UB +av (ay > 0), and a rotation speed control device that outputs a command signal to each of the motors based on each rotation speed ■A177s, "jjc" output from the calculation device. It is characterized by having the following.

[Function] Therefore, based on the rotational speed ■A of the cooling roll preset by the setting device, the rotational speed υB of the roll device and the rotational speed ■C of the take-up roll are determined by the calculation device as υB - ■A.
−βV (βV〉0) and υc='j7e+αV (α
V > 0), each rotation speed ■A1υB
Based on 1■C, a command signal is output from the rotational speed control device to each motor, and the cooling roll, roll device, and take-up roll are respectively driven at rotational speeds ■A and υB1■C. A weak compressive force is applied to the slab immediately after solidification to prevent cracking, and a desired small tensile force or zero stress is applied to the slab between the roll device and the take-up roll, so that the slab is is wound stably.

【Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, and the parts in the figure with the same reference numerals as in FIG. 2 represent the same parts.

As shown in FIG. 1, the cooling roll 3
．． The rotational speed 1jA of the roll device 11 is set to 1jA, and the rotational speed 1jA set by the setting device 16 can be given to the arithmetic device 17, and the arithmetic device 17 changes the rotational speed υB of the roll device 11 to the rotational speed 1jA. Functional relationship υB−■A− for A
It is determined by βV (βv〉0) (βV is the minute speed change that should reduce the material speed, that is, the rotational speed υ day of the roll device 11, from the rotational speed ■A of the cooling roll 3.4.) The rotational speed IJc of the take-up roll 13 is ■
C−υB+αV (at αv>0?7a<■C) (in addition, α
V is the winding roll 1 from the rotation speed UB of the roll device 11.
This is the minute speed change amount by which rotational speed ■C of No. 3 should be increased. ) so that the output signal from the arithmetic unit 17 can be given as a command signal to each motor 1, 2 and 10.12 via the rotational speed control device 18,
Cooling roll 3.4, roll device 11. Winding roll 13
The configuration is such that each rotational speed '/JA1υBSUc can be controlled. In the figure, 19 is a loop detector, 20 is a tension detector, and 21.22 is a feedback comparison adder.

Next, the operation of the above embodiment will be explained.

When the molten metal 8 in the tundish 7 is supplied between the cooling rolls 3.4 via the core 6 to form a pool, the rotational speed IJA of the cooling roll 3.4, which is preset in the setting device 16, is set. The calculation device 17 is manually inputted, and the calculation device I7 calculates the rotational speed υB of the roll device 11 and the rotational speed ■C of the take-up roll 13, respectively, by 'j7e −■A−βV (βv〉
0) and ■C−υB+αV
(αV>0), each rotation speed ■A1
Based on υB1■C, a command signal is output from the rotational speed control device 18 to each motor L, 2, and 1O112 (at the start of casting and the start of winding, a command signal is output from the loop detector 19 and tension detector 20). (No detection signal is output to the feedback comparison adders 21 and 22), the cooling rolls 3 and 4, and the roll device 11. The winding rolls 13 are each driven at a rotational speed ■A1υB1■C.

As a result, the molten metal 8 in the pool is transferred to the cooling roll 3.
．． 4, the slab 9 is cooled and solidified, and the slab 9 is passed through the roll device 11 to the winding roll 13.
The cast slab 9 is guided by the cooling roll 3.4 and wound up by the winding machine 14, but a weak compressive force is applied to the slab 9 immediately after solidification between the cooling roll 3.4 and the roll device 11, thereby preventing the occurrence of cracks. At the same time, the slab 9 has almost completely solidified and cooled between the roll device 11 and the take-up roll 13.
Since a desired small tensile force or zero stress acts on the slab 9, the slab 9 can be wound stably.

In addition, the rotational speed ■A1υB1■C in the embodiment of the present invention
The interrelationship between is mainly important at the start time of casting and the start time of winding, and once the start time reaches a steady state, ■
If A″, υB″, and Uc are not met, both the compressive stress and the tensile stress will become infinitely large. To mutually correct the rotational speed from the start to steady state ■A, υ day, ■C, a loop detector 19 is used between the cooling roll 3.4 and the roll device 11, and the portion proportional to the loop displacement is compared for feedback. It may be fed back via the adder 21. Roll device 1
1 and the take-up roll 13, a tension detector 20 is placed between the roll device 11 and the take-up roll 13, and its output is sent to a feedback comparison adder 22 to correct the rotation speed ■C. Just do it.

Further, the roll device 11 is not limited to the pinch roll type shown in FIG. 1, but may also be a rotating body such as a rolling mill or a trimmer.

It should be noted that the roll type continuous casting equipment of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, the roll-type continuous casting equipment of the present invention has the excellent effect of being able to stably wind up the slab without causing cracks in the slab. obtain.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of one embodiment of the present invention, and FIG. 2 is an overall side view showing a conventional example. 1.2, 10.12 are motors, 3, 4 are cooling rolls, 7
is a tandish, 8 is a molten metal, 9 is a slab, 11 is a roll device, 13 is a take-up roll, 1B is a setting device, I7 is a calculation device, 1B is a rotation speed control device, 19 is a loop detector,
20 is a tension detector, 21.22 is a feedback comparison adder, UAsυB, ■C is the rotation speed, αV is the minute speed change that should reduce the material speed below the cooling roll circumferential speed, βV is the roll of the roll device Indicates the minute speed change amount that should increase the winding speed from the circumferential speed.

Claims (1)

[Claims] 1) Cooling rolls arranged horizontally and parallelly at required intervals, a motor for rotationally driving the cooling rolls, and a motor installed above the cooling rolls for supplying molten metal between the cooling rolls. a tundish, a winding roll provided on the exit side of the cooling roll for winding up the slab drawn out from between the cooling rolls, a motor for rotationally driving the winding roll, and the cooling roll and the winding roll. In a roll-type continuous casting facility comprising a roll device disposed between rolls and guiding the slab to the take-up roll side, and a motor for rotationally driving the roll device, the rotational speed of the cooling roll is A setting device for setting _A, and a rotational speed of the cooling roll set by the setting device.■ The rotational speed of the roll device based on _A.■_B and the rotational speed of the winding roll.
＿C respectively ■＿B=■＿A−βv(βv＞0) and■＿
A calculation device that determines the relationship C=■_B+α_V (α_V>0), and a rotation that outputs a command signal to each of the motors based on each rotational speed ■_A, ■_B, and ■_C output from the calculation device. Roll-type continuous casting equipment characterized by being equipped with a speed control device.