JP2008212990A - Press type cast slab rolling reduction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press type cast slab rolling reduction apparatus which has a compact and inexpensive configuration and a function for carrying cast slabs. <P>SOLUTION: The cast slab rolling reduction apparatus 10 includes a lower roll 20 held so as to rotate, and an upper roll 21 which is arranged just above the lower roll 20 and carries out the rolling reduction of the cast slab 18 arranged on the lower roll 20 by means of a rolling reduction cylinder 27. In this apparatus, the rotation of the upper roll 21 is carried out by means of a hydraulic cylinder 32 which is connected to the shaft 29 of the upper roll 21 via arms 30 and is driven synchronizing with the rolling reduction of the rolling reduction cylinder 27. The lower roll 20 is rotationally driven by a rotational driving source 42, and a feed is given to a bloom 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to, for example, a press-type slab reduction device that is used by being attached to a continuous casting machine that produces a bloom with a plurality of strands and provided on the upstream side of a slab cutting device.

The rolling reduction apparatus attached to the continuous casting machine is generally arranged upstream of the cutting apparatus. This reduction rolling apparatus is composed of a pair of upper and lower rolls for applying a rolling force to the slab and a drive source for these rolls. When the temperature of the slab is reduced at the time of rolling down, the deformation resistance of the slab is large, and the rolling mill adopting the rolling method requires a large rolling force and driving force, and the roll drive source is enlarged. To do. And if a drive source enlarges, since a drive source receives arrangement | positioning restrictions, it becomes impossible to install a rolling-rolling apparatus in an optimal position, Due to problems, such as temperature management of a slab, it becomes a continuous casting machine which has three or more strands, for example. However, there arises a problem that the rolling reduction apparatus cannot be applied.

Here, when the above-described problem is solved and a reduction rolling apparatus is to be installed, it is conceivable to apply a pressing apparatus that performs reduction while conveying the slab. For example, Patent Document 1 discloses a die for reduction. A thickness press apparatus is disclosed that moves down and up and down and conveys the slab while conveying the slab. Moreover, in patent document 2, while installing the pinch roll group which manages the drawing | extracting movement of a slab on the entrance side of a pair of upper and lower anvils which apply a forging process to a slab, the slab of a slab accompanying a forging process is provided on the exit side of an anvil. There has been disclosed a continuous forging apparatus in which a pair of upper and lower rolls capable of changing the rotational driving speed in accordance with a change in moving speed is arranged.

Japanese Patent Laid-Open No. 11-239832 JP-A-4-59159

However, the invention described in Patent Document 1 has a problem that equipment costs and maintenance costs increase because the mold is driven by a complicated link mechanism. Furthermore, although the slab can be reduced, there is a problem that it is impossible to obtain a large rolling force and driving force necessary to reduce a slab such as a bloom whose temperature has decreased.
Further, in the invention described in Patent Document 2, a pinch roll group must be arranged on the entrance side of the anvil, and a pair of upper and lower rolls capable of changing the driving speed on the exit side, which complicates the apparatus configuration. There arises a problem that the equipment cost and the maintenance cost increase.

The present invention has been made in view of such circumstances, and an object thereof is to provide a press-type slab reduction device having a compact slab conveying function with a compact and inexpensive apparatus configuration.

A press-type slab reduction device according to the present invention that meets the above-described object includes a lower roll that is rotatably held, and a slab that is arranged immediately above the lower roll and that is placed on the lower roll by a reduction cylinder. In a slab reduction device having an upper roll
The upper roll is rotated by a hydraulic cylinder that is connected to the axis of the upper roll via an arm and is driven in accordance with the reduction of the reduction cylinder.

In the press-type slab reduction device according to the present invention, it is preferable that the lower roll is rotationally driven by a rotational drive source to feed the slab.

In the press-type slab reduction device according to the present invention, the slab may be a bloom in which the temperature of a continuous casting machine is lowered.

In the press-type slab reduction device according to any one of claims 1 to 3, the upper roll is reduced by the reduction cylinder, and the upper roll is rotated by driving the hydraulic cylinder in accordance with the reduction of the reduction cylinder. A device that performs a reduction exceeding 500 tons and a torque exceeding 20 tons / m can be manufactured with a compact and inexpensive configuration. As a result, the press-type slab reduction device can be applied to a continuous casting machine having three or more strands without major equipment modification.

In particular, in the press-type slab reduction device according to claim 2, since the lower roll is rotationally driven to feed the slab, the slab conveying function is provided in the press-type slab reduction device with a compact and simple configuration. Can be provided.
In the press-type slab reducing device according to the third aspect, it is possible to reduce the bloom whose temperature has been reduced, and it is possible to produce a bloom having no variation in internal quality.

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 press-type 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. FIG. 3 is a side view of the press-type slab reduction device, and FIGS. 4A and 4B are hydraulic cylinders that rotate and drive the upper roll of the press-type slab reduction device. FIGS. 5A to 5D are explanatory views showing the operation status of the reduction cylinder that moves up and down the upper roll, and FIGS. 5A to 5D show the operation of the upper roll and the bloom reduction process when the bloom is reduced by the press-type slab reduction device. Explanatory drawing shown, (E) is explanatory drawing of the uneven | corrugated pattern by the reduction formed in the upper surface side of a bloom.

As shown in FIG. 1, a press-type slab reduction device 10 according to an embodiment of the present invention is attached to each of a plurality of strands of a continuous casting machine 11, and is a bloom (for example, temperature is an example of a slab). The lowered bloom) 18 is squeezed down, and is disposed upstream of the slab cutting device 19. In the continuous casting machine 11, the molten steel 13 is cooled by the mold 12 to form a solidified shell 14, further cooled while passing through the support roll group 15 and the guide roll group 16, and passed through the light pressure roll group 17. Fully solidified to form bloom 18. The press-type slab reducing device 10 includes a lower roll 20 that is rotatably held, and an upper roll 21 that is disposed immediately above the lower roll 20 and that rolls down the bloom 18 disposed on the lower roll 20. And have. This will be described in detail below.

As shown in FIGS. 2 and 3, the press-type slab reduction device 10 has a housing 24 that is fixed on a base 22 that supports a light reduction roll group 17 of the continuous casting machine 11 via an installation member 23. The lower roll 20 is attached to the lower portion of the housing 24 via bearings 25 so as to be rotatable on both sides. On the other hand, both sides of the upper roll 21 are rotatably supported by bearings 26, and each bearing 26 is attached to the upper portion of the housing 24 via a reduction cylinder 27. By adopting such a configuration, the upper roll 21 can be disposed immediately above the lower roll 20, and the upper rolls can be driven by synchronously driving the reduction cylinders 27 by operating a reduction cylinder drive source (not shown). 21 can be lowered, and the bloom 18 arranged on the lower roll 20 can be rolled down. In addition, when the upper roll 21 and the lower roll 20 each select an appropriate profile, when the bloom 18 is crushed by the upper and lower rolls 21 and 20, the internal void existing in the center of the bloom 18 is efficiently removed. The number and the maximum dimension can be reduced by crimping.

Here, an arm 30 is provided at each end portion of the shaft 29 of the upper roll 21, and a tip portion of each arm 30 is provided with a hydraulic cylinder 32 provided on both upper sides of the housing 24 via attachment members 31. The piston rod 33 is connected via a pin 34. The operation stroke of the piston rod 33 of the hydraulic cylinder 32 is set longer than the operation stroke of the piston rod 44 (see FIG. 4) of the reduction cylinder 27.
Further, one side of the shaft 35 of the lower roll 20 is connected to an output shaft of a first bevel gear mechanism 36 which is an example of power transmission means, and a connecting shaft 38 is connected to an input shaft 37 of the first bevel gear mechanism 36. Is connected. The front side of the connecting shaft 38 is connected to the output shaft 40 of the second bevel gear mechanism 39, and the input shaft 41 of the second bevel gear mechanism 39 is an output shaft of a hydraulic motor 42 which is an example of a rotational drive source. 43 are connected.

With this configuration, as shown in FIG. 4A, a hydraulic cylinder drive source (not shown) is operated to drive the hydraulic cylinder 32 and cause the piston rod 33 to protrude downward. Then, since the arm 30 rotates around the axis of the upper roll 21, the upper roll 21 rotates around the axis in conjunction with the movement of the arm 30. Therefore, when the hydraulic cylinder 32 is driven in accordance with the reduction of the reduction cylinder 27, the upper roll 21 can be lowered while rotating. Here, since the operation stroke of the piston rod 33 of the hydraulic cylinder 32 is set to be longer than the operation stroke of the piston rod of the reduction cylinder 27, the upper roll 21 descends a predetermined distance and stops and is disposed on the lower roll 20. The bloom 18 can be rotated even in a state where it is crushed, and the bloom 18 arranged on the lower roll 20 can be pushed out while being crushed by the upper roll 21.

When the piston rod 33 of the hydraulic cylinder 32 operates downward for a fixed stroke (fixed time), as shown in FIG. 4B, the upper roll 21 is raised by driving the drive cylinder for the rolling cylinder reversely. By disengaging from the bloom 18, the height position of the upper roll 21 can be returned to the initial position. Here, if the height position of the upper roll 21, for example, the height position of the axial center of the upper roll 21 is measured, has the upper roll 21 detached from the bloom 18 from the height position of the axial center of the upper roll 21? It can be determined whether or not. For this reason, when it is detected that the upper roll 21 is detached from the bloom 18, the hydraulic cylinder drive source is driven in reverse to operate the piston rod 33 of the hydraulic cylinder 32 upward to reversely rotate the arm 30. The angular position of the upper roll 21 in the circumferential direction can be returned to the initial position.

Further, if the hydraulic motor 42 is rotationally driven by operating a hydraulic drive source (not shown), the rotational driving force is supplied to the second bevel gear mechanism 39, the connecting shaft 38, and the first bevel gear mechanism 36. The lower roll 20 can be rotationally driven by being transmitted to the lower roll 20 via the. Thereby, when the upper roll 21 is not in contact with the bloom 18 (when the bloom 18 is not crushed), the lower roll 20 can be rotated to send out the bloom 18 disposed on the lower roll 20. . Since the torque applied to the lower roll 20 by the hydraulic motor 42 is smaller than the torque applied to the upper roll 21 by the arm 30, the lower roll 20 is rotated by the bloom 18 when the bloom 18 is being reduced.
Accordingly, the first operation of lowering and rotating the upper roll 21 and the second operation of raising the upper roll 21, reversely rotating the upper roll 21, and rotating the lower roll 20 are alternately performed. The unpressurized lower portion can be crushed, the lower portion of the bloom 18 can be discharged from directly below the upper roll 21, and the uncompressed lower portion can be supplied directly below the upper roll 21.

Next, a method for reducing the bloom 18 by the press-type slab reducing apparatus 10 according to an embodiment of the present invention will be described.
As shown in FIG. 5 (A), a bloom conveyance mechanism (not shown) provided in the continuous casting machine 11 directly below the upper roll 21 in which the tip of the bloom 18 is at an initial position (also referred to as a retracted position). As shown in FIG. 5B, the upper roll 21 is rotated by synchronously driving the driving source for the down cylinder and the driving source for the hydraulic cylinder for a preset time, for example, 1 second. While being lowered by a predetermined distance h, pressing (crushing) is performed (the first operation). Here, since the upper roll 21 rotates during the reduction, the bloom 18 is pushed out while being reduced, and when the reduction is completed, the tip of the bloom 18 protrudes from the position immediately below the upper roll 21 by d. Yes.

When the reduction of the upper roll 21 is completed, as shown in FIG. 5C, the drive source for the reduction cylinder and the drive source for the hydraulic cylinder are driven in reverse to synchronize with each other for a preset time, for example, 1 second. The roll 21 is raised by a predetermined distance h while rotating in reverse. Further, while the upper roll 21 is not in contact with the bloom 18, the lower roll 20 is rotated by the rotation of the hydraulic motor 42 so that the bloom 18 disposed on the lower roll 20 is sent out by a certain distance, for example, d. (The second operation). As a result, the upper roll 21 returns to the retracted position, and the tip of the bloom 18 protrudes from the position immediately below the upper roll 21 by 2d.

When it is confirmed that the upper roll 21 has returned to the retracted position, as shown in FIG. 5D, the drive source for the down cylinder and the drive source for the hydraulic cylinder are synchronized for a preset time, for example, 1 second. The first operation is performed to drive and lower the roll 21 by a predetermined distance h while rotating the upper roll 21. As a result, the tip of the bloom 18 protrudes from the position immediately below the upper roll 21 by 3d when the reduction is completed. Next, when the upper roll 21 has been reduced, the lower cylinder drive source and the hydraulic cylinder drive source are driven in reverse to raise the upper roll 21 by a predetermined distance h while rotating in the reverse direction, while the upper roll 21 is not being reduced. Performs a second operation of rotating the hydraulic motor 42 to send out the bloom 18 by a certain distance, for example, d.

Then, the bloom 18 is reduced by repeating the first operation and the second operation. As a result, a concavo-convex pattern having a pitch of 2d and a level difference of the convex portion 45 of δ is formed on the upper surface side of the bloom 18 as shown in FIG. For example, the reduction force of the reduction cylinder 27 is 250 tons, the pressing force of the hydraulic cylinder 32 is 10 tons, the outer diameter of the central portion of the upper roll 21 is 430 mm, the thickness of the bloom 18 is 370 mm, and the reduction distance h of the upper roll 21 When the extrusion distance d of the bloom 18 due to 30 mm, one reduction and rotation of the lower roll 20 is 10 mm, the step δ is less than 0.3 mm in calculation.

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, hydraulic cylinders that are connected to the shaft of the upper roll via an arm and rotationally drive the upper roll can be provided on both lower portions of the housing via attachment members.
Further, a rotational drive source can be directly connected to the lower roll and driven to rotate. In this case, since a space can be secured on the upper surface portion of the housing, hydraulic cylinders that rotate the upper roll can be disposed on both sides of the upper surface portion of the housing.

It is explanatory drawing which shows the condition which attaches the press-type slab reduction apparatus which concerns on one embodiment of this invention to the strand of a continuous casting machine, and is reducing the bloom. It is a front sectional view of the press type slab reducing device. It is a side view of the press type slab pressing device. (A), (B) is explanatory drawing which shows the operation | movement condition of the hydraulic cylinder which rotationally drives the upper roll of the press type slab reduction device, and the reduction cylinder which raises / lowers the upper roll. (A)-(D) is explanatory drawing which shows the operation | movement of an upper roll at the time of bloom reduction with the press type slab reduction device, and the bloom reduction process, (E) is formed in the upper surface side of bloom. It is explanatory drawing of the uneven | corrugated pattern by reduction.

Explanation of symbols

10: Press slab reduction device, 11: Continuous casting machine, 12: Mold, 13: Molten steel, 14: Solidified shell, 15: Support roll group, 16: Guide roll group, 17: Light reduction roll group, 18: Bloom , 19: cutting device, 20: lower roll, 21: upper roll, 22: base, 23: installation member, 24: housing, 25, 26: bearing, 27: reduction cylinder, 29: shaft, 30: arm, 31 : Mounting member, 32: hydraulic cylinder, 33: piston rod, 34: pin, 35: shaft, 36: first bevel gear mechanism, 37: input shaft, 38: connecting shaft, 39: second bevel gear mechanism , 40: output shaft, 41: input shaft, 42: hydraulic motor, 43: output shaft, 44: piston rod, 45: convex portion

Claims (3)

In a slab reduction device comprising: a lower roll held rotatably; and an upper roll disposed immediately above the lower roll and squeezing the slab disposed on the lower roll by a reduction cylinder;
2. A press-type slab reduction device, wherein the upper roll is rotated by a hydraulic cylinder connected to an axis of the upper roll via an arm and driven in accordance with the reduction of the reduction cylinder. 2. The press-type slab reduction device according to claim 1, wherein the lower roll is rotationally driven by a rotational drive source to feed the slab. 2. The press-type slab reduction device according to claim 1, wherein the slab is a bloom in which a temperature of a continuous casting machine is lowered.

Images