KR101462399B1 - Hot Plate Shape Controller - Google Patents

Abstract

The present invention relates to a thick plate shape correcting apparatus with an improved shape correcting ability so that calibration can be completed in a thick plate production line without requiring further calibration, and the present invention relates to a thick plate shape correcting apparatus for correcting a thick plate rolled in a rolling mill, Roller leveler; And a first constraining roll which is driven by pressing the upper and lower surfaces of the thick plate to pass the thick plate at a higher speed than the first roller leveler at a rear end of the roller calibrator.

Description

{Hot Plate Shape Controller}

The present invention relates to a thick plate shape correcting apparatus for correcting the shape of a thick plate, and more specifically, to improve a thick plate shape correcting ability, a restraining roll is provided at the rear end of the roller rectifier so that calibration and cooling are performed in a tensioned state And more particularly to a thick plate shape correcting apparatus capable of obtaining high correction efficiency.

Figure 1 shows a rolling-cooling-calibrating line of a general thick plate. As shown in FIG. 1, the thick plate comes out of the heating furnace 10 at a high temperature and passes through the mill 20 including the roughing mill 20a and the longitudinal mill 20b, And then is acceleratedly cooled in the cooling device 40. [ The accelerated chilled plate passes through a hot calibrator 50, is shape corrected, and is cooled in a cooling zone after passing through a hot calibrator.

If an attempt is made to ensure the flatness of the rolled plate in the above-mentioned plate rolling-cooling-correcting line, and then further correction is required, the shape of the plate is calibrated through cooling and calibrating. However, there is a problem that the cold plate of the plate requires additional processing, which requires a lot of time and cost.

In recent years, a technology applied to a cooling device has been proposed in which a roll is provided in a cooling device to serve as a dam that keeps the water at the time of cooling and maintain uniform cooling in the width direction.

However, such a roll serving as a dam plays a role of keeping the cooling water in the cooling apparatus while maintaining a gap of 5 to 10 mm or more in relation to the plate thickness, and does not apply a pressing force to the plate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thick plate shape correcting apparatus having an increased shape correcting capability so that calibration can be completed in a thick plate production line without requiring additional correction.

It is another object of the present invention to provide a thick plate shape correcting device capable of easily adjusting a shape defect by adding a tensile force to a shape during calibration.

It is another object of the present invention to provide a shape correcting apparatus capable of producing a thick plate with improved flatness.

In order to achieve the above object, the present invention provides the following plate shape correcting apparatus.

The present invention relates to a rolling mill, comprising: a first roller leveler comprising a plurality of rolls for calibrating a rolled steel plate rolled in a rolling mill; And a first constraining roll which is driven by pressing the upper and lower surfaces of the thick plate to pass the thick plate at a higher speed than the first roller leveler at a rear end of the roller calibrator.

In the present invention, the number of lower calibrating rollers is larger than the number of upper calibrating rollers, and the first restraining rollers are disposed staggered from each other. The first restraining rolls press the upper restraining roll and the lower restraining roll at the same position in the longitudinal direction of the plate, Can be driven.

In the present invention, the first constraining roll may include a plurality of roller pairs disposed along the direction of advancement of the thick plate.

A cooling device for spraying or spraying cooling water to cool the thick plate may be provided between the pair of rollers and the roller pair of the first constraining roll.

In the present invention, the thick plate shape correcting apparatus includes a second roller leveler for calibrating a thick plate at the rear end of the first confining roll and the cooling device, and a second constraining roll driven by pressing the upper and lower surfaces of the thick plate at the rear end of the second roller leveler And the second constraining roll can move the thick plate at a higher speed than the second roller leveler.

The present invention may further include a flatness meter for measuring the flatness of the thick plate passing between the cooling device and the second roller leveler, and a control unit connected to the flatness meter, the first and second constraining rollers and the first and second roller levelers And the controller may adjust the speed difference between the first constraining roll and the first roller leveler and the speed ratio between the second constraining roll and the second roller leveler based on the flatness measurement value of the flatness meter.

According to the present invention, it is possible to provide a thick plate shape correcting apparatus with an increased shape correcting capability so that the calibration on the heavy plate production line can be completed without the need for further calibration.

Further, in the present invention, it is possible to provide a thick plate shape correcting device capable of easily adjusting a shape defect by adding a tensile force at the time of calibration, thereby making it possible to arrange the shape.

In addition, the present invention can produce a thick plate having improved flatness through a shape correcting device with improved shape correcting ability.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram illustrating a conventional plate rolling-cooling-calibrating line;
2 is a schematic view of the shape correcting apparatus of the present invention.
Fig. 3 is a schematic view of the shape correction of the present invention, and Fig. 4 is an enlarged view of the schematic view of Fig.
5 is a schematic view showing a first calibrator and a first restraining roll of the present invention.
6 is a schematic view showing the state of a thick plate by tension and compression.
7 is a graph showing the speed along the traveling direction of the work.
8 is an operation diagram showing the operation of the first calibrating device, the first confining roll, and the cooling device of the present invention.
Fig. 9 is a schematic view showing a state of the thick plate in the constraining roll. Fig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

2 to 5 are schematic views of a shape correcting apparatus according to the present invention.

The shape correcting apparatus of the present invention is arranged after the heating furnace 10, the roughing mill 20a and the longitudinal mill 20b and includes a first roller leveler 30 corresponding to a preliminary calibrator, (40) arranged in series with the first roller leveler (30) and provided with a first restraining roll (43) for providing a tensile force to the first roller leveler (30) A second roller leveler 50 for hot-calibrating the thick plate behind the flatness meter 60, a second constraining roll 50 for providing a tensile force behind the second roller leveler 50 70) and a cooling stand (80) for gradually cooling the hot plate.

The first roller leveler 30, the cooling device 40, the first restraining roll 43, the flatness meter 60, the second roller leveler 50 and the second restraining roll 70 are controlled by the controller C The controller C controls the first roller leveler 30, the cooling device 40, the first restraining roll 43, and the second restraining roller 43 based on the flatness value measured by the flatness meter 60 2 roller leveler 50 and the second restraining roll 70. [

In the present invention, the first roller leveler 30 comprises a plurality of rolling rolls. As shown in FIGS. 3 and 4, the number of lower calibrating rolls in the first roller leveler 30 is greater than the number of upper calibrating rollers and staggered with respect to each other, thereby flattening the heavy plate passing through the first roller leveler 30.

The first restraining rolls 43 and 44 are disposed at the rear end of the first roller leveler 30 and between the first restraining rolls 43 and 44 are provided an upper cooling water spraying part 41 of the cooling device 40 And the lower cooling water spraying section 42 is disposed. The first constraining rolls 43 and 44 may be implemented as two pairs of rolls as shown in FIGS. 3 and 4, or three pairs of rolls or more as shown in FIG.

In the present invention, the first constraining roll 43 includes an upper constraining roll 43a and a lower constraining roll 43b for pressing and driving the same longitudinal point of the thick plate P in the longitudinal direction. At least one of the upper restraining roll 43a and the lower restraining roll 43b applies a reduction amount to a thick plate passing through a cylinder (not shown) moved in the vertical direction. Further, the first constraining roll 43 moves the thick plate at a higher speed than the first roller leveler 30.

In the present invention, the first restraining roll 43 moves the thick plate P at a higher speed than the calibrating roll of the first roller leveler 30. Therefore, a tensile force is applied to the thick plate P by the difference between the moving speed at the first roller leveler 30 and the moving speed at the first confining roll 43, and as a result, the flatness of the thick plate P Can be improved. When the gap of the first restraining roll 43 is adjusted, stretching in the longitudinal direction is locally performed at the portion pressed by the first restraining roll 43, and a flat shape can be obtained.

Fig. 6 shows a state in which the stretching contributes to the flatness in order to improve the flatness of the thick plate. 6 (a) shows a state in which the plate shape is corrected. 6 (a) shows a state in which the shape of the plate is flat when tensile force is applied. In FIG. 6 (b), buckling occurs in the plate shape when compression is applied, Are shown to have a negative effect.

In particular, if the first roller leveler 30, which provides a bending mechanism with the tension, is operated, a high calibrating efficiency, i. E.

Fig. 7 shows the progress speed of the thick plate of the present invention. As shown in FIG. 7, since the preliminary calibrator corresponding to the first roller leveler 30 is maintained at a constant speed, but is driven by the first constraint roll 43 at a speed higher than that of the first roller leveler 30, The moving speed of the thick plate P is increased by the first constraining roll 43, thereby applying the tensile force.

In the present invention, not only the first constraining rolls 43 and 44 but also a second constraining roll 70 disposed at the rear end of the second roller leveler 50 (see FIG. 2). At the rear end of the second roller leveler 50, the second restraining roll 70 also moves the thick plate P at a higher speed than the second roller leveler 50. Therefore, similarly to the first restraining rolls 43 and 44, the second restraining roll 70 also generates a tensile force due to the difference in moving speed, and this tensile force brings about an improvement in flatness.

Particularly, in a state in which tension is applied to the thick plate P at the rear end of the first roller leveler 30 and the second roller leveler 50, the first roller leveler 30, the second roller leveler 50, The roll 43 and the second restraining roll 70 apply a pressing force to the thick plate so that bending and tensile act simultaneously and the shape correcting ability can be dramatically increased.

Further, the number of rolls in the first roller leveler 30 is different from that in the first roller leveler 30, and the bending force is finally raised or lowered. However, in the present invention, since the first restraining roll 43 is disposed at the rear end of the first roller leveler 30, the rising or falling back plate is held by the first restraining roll 43 and pulled, Can contribute to the rise. Further, support points for the output rolls are generated, and the effect of correcting by bending can be increased.

In the present invention, the control portion C controls not only the degree of correction of the first and second roller correcting portions 30 and 50, the cooling water amount of the cooling device 40, and the cooling water supply position, The speed difference between the first and second restraining rollers 43 and 70 and the amount of reduction of the first and second restraining rollers 43 and 70 can be controlled, It is possible to precisely control the operation of the apparatus. Particularly, since the flatness degree is measured by the flatness meter 60 and then the second roller correcting unit 50 and the second constraining roll 70 are controlled based on the measured flatness, The calibration can be performed accurately, and an additional cooling calibration process can be dispensed with.

8 shows the operation of the first constraining rolls 43, 44 and 45 arranged inside the cooling device 40. In Fig. 8, the first restraining roll 43 is adjacent to the first roller leveler 30, and applies a tensile force to the thick plate P coming into the cooling device 40 to flatten the plate (see FIG. 8 b) References. The first confining rolls 43 and 44 are disposed with the upper cooling water spraying part 41 and the lower cooling water spraying part 42 of the cooling device 40 interposed therebetween. The cooling water injected from the lower cooling water spraying section 42 is sprayed by the first constraining rolls 43 and 44 in a state in which the thick plate is subjected to a tensile force so that the distortion of the plate due to cooling can be prevented.

Further, the upper confining rolls 43a and 44a of the first confining rolls 43 and 44 of the present invention also serve as dams for staying the water on the upper surface of the thick plate, Cooling can be achieved.

The sheet deformation caused during cooling is controlled by the amount of reduction of the first confining rolls 44 and 45 and the tensile / stretching between the first confining rolls 43, 44 and 45 and the first confining rolls 43, / RTI > can be suppressed / eliminated through roll gap control of < / RTI >

Fig. 9 is a schematic view showing the state of the thick plate P in the restraining rolls 43, 44, 45, and 70. Fig. As shown in FIG. 9, the roll gap of the restraining rolls 43, 44, 45, and 70 is adjusted, so that local longitudinal stretching occurs at the portion to be pressed down, thereby improving the plate shape. Since the present invention further includes the restraining rolls 43, 44, 45, and 70, the shape correcting ability of the thick plate can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: heating furnace 20: rolling mill
30: first roller leveler 40: cooling device
43, 44, 45: first restraining roll 50: second roller leveler
60; Flatness meter 70: second restraining roll
80: Cooling zone

Claims (6)

delete delete delete delete A first roller leveler comprising a plurality of rolls to calibrate the rolled plate in the rolling mill; And
And a first confining roll which is driven by pressing the upper and lower surfaces of the thick plate so as to pass the thick plate at a higher speed than the first roller leveler at a rear end of the first roller leveler,
Wherein the first roller leveler has a number of lower calibrating rolls greater than the number of upper calibrating rolls,
Wherein the first constraining roll includes a plurality of roller pairs arranged such that the upper constraining roll and the lower constraining roll are driven by pressing down the same point in the longitudinal direction of the thick plate,
A cooling device for spraying or spraying cooling water to cool the thick plate is provided between the roller pair and the roller pair of the first constraining roll,
A second roller leveler for calibrating a thick plate at the rear end of the first confining roll and the cooling device, and a second constraining roll driven by pressing the upper and lower surfaces of the thick plate at the rear end of the second roller leveler,
And the second constraining rolls move the thick plate at a higher speed than the second roller leveler.
6. The method of claim 5,
A flatness meter for measuring a flatness of a thick plate passing between the cooling device and the second roller leveler,
Further comprising a controller coupled to the flatness gauge, the first and second constraining rolls, and the first and second roller levelers,
Wherein the controller adjusts the speed difference between the first restraining roll and the first roller leveler and the speed difference between the second restraining roll and the second roller leveler based on the flatness measurement value of the flatness meter Calibration device.

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