JP4879055B2 - Slab reduction device and slab reduction method - Google Patents

Description

The present invention relates to a slab reduction in which reduction means having upper and lower reduction rolls for reducing the slab respectively casted by a plurality of strands of a continuous casting machine are arranged at the same position with respect to the slab movement direction of each strand. The present invention relates to an apparatus and a slab reduction method.

Since there is an internal gap in the center of the slab cast by the continuous casting machine, a slab reduction device is provided at the upstream part of the slab cutting device to reduce the slab. It has been practiced to improve the quality of the center part of the slab by reducing the number and maximum dimensions (for example, see Patent Document 1).

JP-A-8-206804

Here, the slab reduction device includes upper and lower reduction rolls for reducing the slab, a pressure source for applying a reduction force to the upper and lower reduction rolls, and a drive source for rotating the upper and lower reduction rolls. It has a reduction means. And when the temperature of a slab has fallen at the time of squeezing with a slab reduction apparatus, the deformation resistance of a slab is large and a big reduction force is needed for a reduction means. For this reason, a large driving torque is required for the driving source, the driving source is increased in size, and the reduction means is also increased in size. Here, in a continuous casting machine having a plurality of strands, for example, three or more strands, the spacing between the strands is limited. Therefore, when arranging the rolling-down means enlarged for each strand so as not to interfere with each other, adjacent strands In any one of the strands, it is necessary to dispose the reduction means in the slab moving direction. As a result, there is a problem that the slabs cast with the respective strands cannot be squeezed at the same position, that is, the slabs at the same temperature, and the slabs vary in internal quality.

The present invention has been made in view of such circumstances, and is provided in a continuous casting machine that manufactures a slab with a plurality of strands, and can secure a large reduction force even if the driving torque is reduced, and the slab movement of each strand. It aims at providing the slab reduction apparatus and slab reduction method which have the reduction means which can be arrange | positioned in the same position with respect to a direction.

The slab reduction device according to the present invention that meets the above-described object is provided with a slab reduction means having an upper and a lower reduction roll for lowering a slab cast respectively by a plurality of strands of a continuous casting machine. A slab reduction device arranged at the same position,
A first pinch roll that feeds the slab to the rolling-down means is provided immediately upstream of each of the rolling-down means, and a second pinch roll that draws and feeds the slab that has been rolled down immediately downstream of the rolling-down means. Pinch rolls are respectively provided, and the upper and lower pressure reduction rolls, the first and second pinch rolls of the reduction means are driven to rotate , and the rotation speed of the first pinch roll is the upper and lower pressure reduction rolls. The rotation speed of the second pinch roll is set to be greater than the rotation speed of the upper and lower pressure rolls .
Here, the immediately upstream side of the reducing means refers to a range of 1.8 to 3.5 m, preferably 2 to 3 m upstream from the reducing means, and the immediately downstream side of the reducing means refers to the downstream side from the reducing means. 1.8 to 3.5 m, preferably 2 to 3 m.

In the slab reduction device according to the present invention, two rotational drive sources are provided in the upper part of the housing of the reduction means, and the upper and lower reduction rolls can be rotationally driven via an axial direction conversion type reduction gear, respectively. preferable.

In the slab reduction device according to the present invention, a rotational drive source is provided at each housing upper part of the first and second pinch rolls, and the first and second pinch rolls are provided via an axial direction conversion type reduction gear. It is preferable to rotationally drive the pinch roll.

The slab reduction method according to the present invention that meets the above-described object is characterized in that the slabs respectively cast by a plurality of strands of a continuous casting machine are arranged at the same position with respect to the slab movement direction of each strand. A slab reduction method for reducing a slab by a slab reduction device having a reduction means having a reduction roll,
A first pinch roll that feeds the slab to the rolling-down means immediately upstream of the respective rolling-down means, and a second pinch roll that draws and feeds the slab that has been rolled down immediately downstream of the rolling-down means, respectively. And the first and second pinch rolls are rotationally driven together with the upper and lower pressure-reducing rolls, and when the slab is being reduced, the rotation speed of the first pinch roll is that of the upper and lower pressure-reducing rolls. The rotational speed of the second pinch roll is larger than the rotational speed of the upper and lower pressure rolls.

In the slab reduction device according to any one of claims 1 to 3, and the slab reduction method according to claim 4, the slab is fed to the reduction means by a first pinch roll, and the slab is drawn from the reduction means by a first pinch roll. Since the two pinch rolls assist each other, the torque of the upper and lower pressure rolls required for driving the slab can be reduced. As a result, the rolling-down means can be configured compactly, and even if there are three or more strands and there is a restriction on the spacing between the strands, the rolling-down means is arranged at the same position with respect to the slab moving direction on each strand It becomes possible to drive, and it is possible to prevent variations in internal quality from occurring in each slab by reducing each slab at the same temperature.

In particular, in the slab reduction device according to the second aspect, since the rotational drive source is provided on the upper portion of the housing of the reduction means, the rotational drive source can be prevented from being heated by heat radiation from the slab. In addition, since the upper and lower pressure rolls are each driven by a rotational drive source, the rotation speed of the upper and lower pressure rolls can be adjusted individually, and even if the reduction is performed asymmetrically above and below the slab, the slab is uniform. Can be moved.
In the slab reduction device according to claim 3, since the rotation drive source is provided at the upper part of each housing of the first and second pinch rolls, it is possible to prevent the rotation drive source from being heated by heat radiation from the slab. .

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view showing a situation in which a slab reduction device according to an embodiment of the present invention is attached to a strand of a continuous casting machine to perform bloom reduction, and FIG. 2 is a diagram of the slab reduction device. Side view,
FIG. 3 is a plan sectional view of the slab pressing device, FIG. 4 is a front sectional view of the rolling means of the slab pressing device, and FIG. 5 is an explanatory diagram when the bloom is reduced by the slab pressing device.

As shown in FIGS. 1 to 3, a slab reduction device 10 according to an embodiment of the present invention is attached to each of a plurality of strands 12, 12 a, and 12 b (3 in the present embodiment) of a continuous casting machine 11. The bloom 13 which is an example of the cast slab is pressed down, and is arranged in the upstream portion of the cutting device 14. In the continuous casting machine 11, the molten steel 15 is cooled by the mold 16 to form a solidified shell, further cooled while passing through the secondary cooling zone 17 and the drawing straightening device 18, and completely solidified to form the bloom 13. Is done. Reference numeral 19 denotes a cutting bloom cut to a predetermined length by the cutting device 14. The slab reducing device 10 includes a lowering means 22 having an upper pressure lowering roll 20 and a lower pressure lowering roll 21 for lowering the bloom 13 which has been cast by the strands 12, 12 a, and 12 b, respectively, and the strands 12, 12 a, 12 b is arranged at the same position with respect to the bloom moving direction, and a first pinch roll 23 for sending the bloom 13 to the reduction means 22 is provided immediately upstream of each reduction means 22, and immediately downstream of the reduction means 22. A second pinch roll 24 is provided for pulling out and feeding the squeezed bloom 13. This will be described in detail below.

As shown in FIGS. 2, 3, and 4, the reduction means 22 includes a housing 27 that is fixed on a base 25 that supports the drawing straightening device 18 of the continuous casting machine 11 via an installation member 26. The lower pressure reduction roll 21 is horizontally attached to the lower portion of the housing 27 through a bearing 28 so that both sides thereof are rotatably supported. On the other hand, both sides of the up-and-down roll 20 are horizontally supported by bearings 29, each bearing 29 is fixed to a bearing mounting member 30, and the bearing mounting member 30 is attached to the front end of the piston rod 32 of the rolling-down cylinder 31. It is connected via a pin 33. By adopting such a configuration, the upper reduction roller 20 can be disposed immediately above the lower reduction roller 21, and the upper reduction roller 31 is driven by operating the reduction cylinder drive source (not shown). The roll 20 can be lowered, and the bloom 13 arranged on the lower pressure reduction roll 21 can be reduced. It should be noted that the upper and lower rolls 20 and 21 each select an appropriate profile, so that when the bloom 13 is rolled down by the upper and lower rolls 20 and 21, the internal gap present at the center of the bloom 13 is reduced. The number and the maximum dimension can be reduced by efficiently crimping.

Further, one side of the shafts 34 and 35 of the upper and lower pressure lower rolls 20 and 21 is a motor 38 which is an example of a rotational drive source provided on the upper portion of the housing 27 via axial direction conversion type speed reducers 36 and 37, respectively. , 39. Here, the axial direction conversion type speed reducers 36 and 37 are respectively arranged in the axial direction of the large gear 40 and the large gear 40 attached to one side of the shaft 34 of the upper pressure lowering roll 20 and the shaft 35 of the lower pressure lowering roll 21, for example. A worm reduction mechanism 41 a having a worm 41 arranged orthogonally and meshing with the large gear 40, and a longitudinal coupling shaft 42 connected to the worm 41. Further, the axial direction conversion type speed reducers 36 and 37 each have a bevel gear mechanism 46 in which an output shaft 43 is connected to the front side of the longitudinal connecting shaft 42 and an input shaft 44 is connected to the output shaft 45 of the motors 38 and 39. ing. As a result, when the output shaft 45 of the motors 38 and 39 is rotated, the rotational driving force is applied to the upper and lower pressure lower rolls 20 and 21 via the bevel gear mechanism 46, the longitudinal coupling shaft 42, the worm 41, and the large gear 40. The upper and lower pressure rolls 20 and 21 can be rotationally driven.

The first and second pinch rolls 23 and 24 can have the same configuration, and have a housing 48 fixed on the base 25 via an installation member 47, and the first and second pinch rolls 23. , 24 of the upper and lower rolls 49, 50, respectively, the lower roll 50 is horizontally attached to the lower portion of the housing 48 with bearings 51 via the bearings 51 rotatably supported. On the other hand, both sides of the upper roll 49 are horizontally supported by bearings 52 so as to be rotatable. Each bearing 52 is fixed to a bearing mounting member 53, and the bearing mounting member 53 is a piston rod (not shown) of the hydraulic cylinder 54. It connects with the front part via a pin (not shown). With this configuration, the upper roll 49 can be disposed immediately above the lower roll 50, and the upper roll 49 is driven by driving the hydraulic cylinder 54 by operating a hydraulic cylinder drive source (not shown). The bloom 13 arranged on the lower roll 50 can be sandwiched.

Further, one side of each shaft of the upper and lower rolls 49 and 50 is provided with motors 57 and 58, which are examples of rotational drive sources provided on the upper portion of the housing 48 via axial direction conversion type reduction gears 55 and 56, respectively. Connected. Here, the axial direction conversion type reduction gears 55 and 56 that connect the upper and lower rolls 49 and 50 and the motors 57 and 58, respectively, are, for example, large gears attached to one side of the upper and lower rolls 49 and 50, respectively. And a worm reduction mechanism 59 having a worm arranged perpendicular to the axial direction of the large gear and meshing with the large gear, and a longitudinal coupling shaft 60 connected to the worm. Further, the axial direction conversion type speed reducers 55 and 56 each have a bevel gear mechanism 61 in which an output shaft is connected to the front side of the longitudinal connecting shaft 60 and an input shaft is connected to the output shafts of the motors 57 and 58. Accordingly, when the motors 57 and 58 are rotated, the rotational driving force is transmitted to the upper and lower rolls 49 and 50 via the bevel gear mechanism 61, the longitudinal coupling shaft 60, and the worm speed reduction mechanism 59, and the upper and lower rolls are transmitted. 49 and 50 can be rotationally driven.

Then, the slab reduction method of the bloom 13 by the slab reduction apparatus 10 which concerns on one embodiment of this invention is demonstrated.
First, the upper and lower rolls 20 and 21, the first and second pinch rolls 23 and 24, and the lower rolls 49 and 50 are driven to rotate. At this time, the rotational speeds of the upper and lower rolls 49 and 50 on the first pinch roll 23 are larger than the rotational speeds of the upper and lower pressure rolls 20 and 21, and the upper and lower rolls 49 and 50 of the second pinch roll 24 are set. Is set to be larger than the rotation speed of the upper and lower pressure rolls 20 and 21. In addition, the upper cylinder 21 and the first and second pinch rolls 23 and 24 are driven by driving the lower cylinder 31 of the lowering means 22 and the hydraulic cylinders 54 of the first and second pinch rolls 23 and 24, respectively. 49 is lowered to the height positions set by the spacers 65, 66 and 67, respectively.

Then, as shown in FIG. 2, the bloom 13 is supplied to the slab reduction device 10 by being supported by a table roll 63 provided in each of the bloom conveying paths 62 of the strands 12, 12 a, 12 b of the continuous casting machine 11. Then, as shown in FIG. 5, the bloom 13 is sandwiched between the upper and lower rolls 49 and 50 of the first pinch roll 23. At this time, the hydraulic cylinder 54 is adjusted so that the bloom 13 is sandwiched between the upper and lower rolls 49 and 50 with a preset pressing force. As a result, the bloom 13 is sent out from the first pinch roll 23 to the reduction means 22 with a constant pushing force.

Here, since the rotational speed of the lower rolls 49 and 50 is higher than that of the upper and lower pressure rolls 20 and 21 on the first pinch roll 23, it is fed from the first pinch roll 23 and is on the lowering means 22. A constant pushing force is generated in the bloom 13 sandwiched between the lower pressure rolls 20 and 21. For this reason, when the reduction cylinder 31 is adjusted so that the bloom 13 is pressed with the preset reduction force by the upper and lower reduction rolls 20, 21, the bloom 13 is pushed between the upper and lower reduction rolls 20, 21. The pressure is reduced and discharged as the upper and lower pressure rolls 20 and 21 rotate.

The bloom 13 discharged from the rolling-down means 22 is sandwiched between the lower rolls 49 and 50 on the second pinch roll 24. Here, since the rotational speeds of the upper and lower rolls 49, 50 on the second pinch roll 24 are set higher than the rotational speeds of the upper and lower rolling rolls 20, 21, the upper, lower rolls 49, When the hydraulic cylinder 54 of the second pinch roll 24 is adjusted so that the bloom 13 is sandwiched with a preset pressing force at 50, the bloom 13 is pulled from the second pinch roll 24 with a constant pulling force. Then, the bloom 13 drawn into the second pinch roll 24 and sent out is sent to the cutting device 14 while being supported by the table roll 64 of the bloom conveyance path 62.

As described above, the rotational speeds of the upper and lower rolls 49 and 50 on the first pinch roll 23 are made larger than the rotational speeds of the upper and lower pressure rolls 20 and 21, and the upper and lower rolls 49 of the second pinch roll 24. , 50 is set to be larger than the rotational speeds of the upper and lower rolls 20, 21, so that the bloom 13 is pushed toward the lowering means 22, and the pulling force is applied to the blooming 13 under the lowering means 22. Can be loaded respectively. For this reason, it is not necessary to cover the bloom driving force applied to the bloom 13 by the rolling-down means 22 only by the rotation of the upper and lower rolling rolls 20, 21. The torque can be reduced, and the reduction means 22 can be configured compactly.

For example, when the bloom is driven by only the upper and lower pressure rolls and the reaction force is reduced by 500 tons as in the prior art, the upper and lower pressure rolls are required to have a torque of 20 tons · m. In order to rotationally drive the reduction roll, a motor with a capacity of 75 KW and a large reduction gear are required. On the other hand, in the present embodiment, when the reaction force is reduced by 500 tons by the reduction means 22, the reaction forces of the first and second pinch rolls 23 and 24 are 100 to 150 tons, and the upper and lower reduction rolls 20 21, the first and second pinch rolls 23, 24, and the lower rolls 49, 50 both have a torque of 2 tons · m, and the motors 38, 39, 57, 58 have a capacity of 10 kW, and the reduction means 22 And the 1st, 2nd pinch rolls 23 and 24 can be comprised compactly.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the first and second pinch rolls, the upper and lower rolls are independently rotated by two motors, but the bevel gear mechanism used for the axial direction conversion type reduction gear is a two-output shaft type. By doing so, the upper and lower rolls can be driven to rotate by one motor.
The slab reduction device can be similarly applied to the case where the number of strands is 2 or 4 or more.

It is explanatory drawing which shows the condition which attaches the slab reduction apparatus which concerns on one embodiment of this invention to the strand of a continuous casting machine, and is performing bloom reduction. It is a side view of the slab pressing device. It is a plane sectional view of the slab pressing device. It is a front sectional view of the rolling means of the slab rolling device. It is explanatory drawing at the time of performing bloom reduction with the slab reduction apparatus.

Explanation of symbols

10: slab reduction device, 11: continuous casting machine, 12, 12a, 12b: strand, 13: bloom, 14: cutting device, 15: molten steel, 16: mold, 17: secondary cooling zone, 18: drawing straightening device , 19: cutting bloom, 20: upper pressure reduction roll, 21: lower pressure reduction roll, 22: reduction means, 23: first pinch roll, 24: second pinch roll, 25: base, 26: installation member, 27 : Housing, 28, 29: Bearing, 30: Bearing mounting member, 31: Reduction cylinder, 32: Piston rod, 33: Pin, 34, 35: Shaft, 36, 37: Axial direction change type reduction gear, 38, 39 : Motor, 40: Large gear, 41: Worm, 41a: Worm speed reduction mechanism, 42: Vertical coupling shaft, 43: Output shaft, 44: Input shaft, 45: Output shaft, 46: Bevel gear mechanism, 47: Installation member, 48 : C Zing, 49: Upper roll, 50: Lower roll, 51, 52: Bearing, 53: Bearing mounting member, 54: Hydraulic cylinder, 55, 56: Axial change type reduction gear, 57, 58: Motor, 59: Worm Deceleration mechanism, 60: Vertical coupling shaft, 61: Bevel gear mechanism, 62: Bloom transport path, 63, 64: Table roll, 65, 66, 67: Spacer

Claims (4)

A slab reduction device in which the rolling means having upper and lower rolling rolls for slab casting each of a plurality of strands of a continuous casting machine are arranged at the same position with respect to the slab moving direction of each strand. And
A first pinch roll that feeds the slab to the rolling-down means is provided immediately upstream of each of the rolling-down means, and a second pinch roll that draws and feeds the slab that has been rolled down immediately downstream of the rolling-down means. Pinch rolls are respectively provided, and the upper and lower pressure reduction rolls, the first and second pinch rolls of the reduction means are driven to rotate , and the rotation speed of the first pinch roll is the upper and lower pressure reduction rolls. The slab reduction device is characterized in that the rotation speed of the second pinch roll is set to be higher than the rotation speed of the upper and lower pressure reduction rolls . 2. The slab reduction device according to claim 1, wherein two rotational drive sources are provided on the upper portion of the housing of the reduction means, and the upper and lower reduction rolls are rotationally driven through axial direction conversion type reduction gears, respectively. A slab reduction device. 3. The slab reduction device according to claim 1, wherein a rotation drive source is provided on each housing upper part of the first and second pinch rolls, and an axial direction conversion type speed reducer is provided. A slab reduction device, wherein the first and second pinch rolls are rotationally driven through the slab. A slab rolling device comprising slabs each having a slab cast by a plurality of strands of a continuous casting machine and having a rolling unit having upper and lower rolling rolls arranged at the same position with respect to the slab moving direction of each strand. A slab reduction method to reduce the slab,
A first pinch roll that feeds the slab to the rolling-down means immediately upstream of the respective rolling-down means, and a second pinch roll that draws and feeds the slab that has been rolled down immediately downstream of the rolling-down means, respectively. And the first and second pinch rolls are rotationally driven together with the upper and lower pressure-reducing rolls, and when the slab is being reduced, the rotation speed of the first pinch roll is that of the upper and lower pressure-reducing rolls. A slab reduction method, wherein the rotational speed of the second pinch roll is greater than the rotational speed, and the rotational speed of the upper and lower rolls is greater than the rotational speed.

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