JP2001340918A - Cutting method of hot rough rolled material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method of a hot rough rolled material, capable of removing rough rolled material rewound from a coil box from the coil box or a conveying table in a short time. SOLUTION: A hot rolled steel plate is rolled into rough rolled material 11 by a rough rolling mill. The rough rolled material 11 is then wound up to a coil box, and further the wound rough rolled material 11 is rewound toward a direction of a finishing mill. When the rough rolled material 11 can't be re-wound from the coil box in a process of rewinding the rough trolled material to the finishing mill, if rewinding of the rough rolled material 11 is not performed in the coil box 12, the rewound rough rolled material 11 is cut breadthwise in the vicinity of the coil box 12 regarding a method rewinding again the rough rolled material 11 in process of rewinding from the coil box 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a hot rolled material which is unwound from a coil box and cannot be re-wound, from a coil box or a transfer table.

[0002]

2. Description of the Related Art Conventionally, a hot steel sheet is rolled to a predetermined thickness by a rolling facility. This rolling equipment is a rough rolling mill, a coil box, and a finishing rolling mill that are respectively arranged from the upstream side to the downstream side, and between each, and upstream of the rough rolling mill, downstream of the finishing rolling mill. Transport tables provided respectively. The transport table is composed of a plurality of table rolls. When the equipment failure or equipment abnormality occurs after the finishing mill of this rolling equipment, the winding of the rough rolled material after the rough rolling in the coil box and the rewinding of the rough rolled material to the finish rolling are stopped. I had to. Also, by stopping the winding and rewinding of the rough-rolled material in the coil box, it becomes impossible to maintain the temperature of the rough-rolled material at a temperature for finish rolling, etc. The rough roll had to be removed. At this time, the coarse rolled material after the rough rolling is short in the elapsed time from the extraction of the heating furnace (furnace that heats the rolled material to a necessary temperature for rolling) arranged upstream of the rough rolling mill, It can be wound with a coil box. Therefore, after completely rolling the rough-rolled material after the rough rolling in the coil box, the rolled rough-rolled material can be removed from the coil box or the transfer table by being transported with the hook or the like sandwiched therebetween. It is.

On the other hand, the temperature of the rough-rolled material that is unwound from the coil box toward the finishing mill has decreased because the elapsed time from the extraction of the heating furnace has been long. This is because the rewind speed to finish rolling is 30-60.
mpm (m / min), while the rolling speed of the rough rolled material after rough rolling is about 250 to 300 mpm,
This is because the rewind speed is lower than the rewind speed. Therefore, the roughly rolled material to be unwound does not have a sufficient temperature necessary to wind the roughly rolled material again in the coil box.

[0004]

Therefore, as described above, when the rolling of the rough rolled material is stopped in the rolling equipment, a large amount of work is required until the rolling is restored, and a long time is required until the rolling is restored. Was uneconomical. The present invention has been made in view of the above circumstances, and provides a method of cutting a hot rough rolled material capable of removing a rough rolled material unwound from a coil box from a coil box or a transfer table in a short time. The purpose is to do.

[0005]

According to the present invention, there is provided a method for cutting a hot rough rolled material according to the present invention, comprising: In the course of rewinding the rolled rough rolled material in the direction of the finishing mill, if it becomes impossible to rewind the rough rolled material from the coil box, the rough rolled material being unwound from the coil box is re-rolled. In the winding method, when the coil box cannot rewind the rough rolled material, the rough rolled material unwound near the coil box is cut in the width direction. In this way, by cutting the rough-rolled material in the width direction in the vicinity of the coil box, the portion of the rough-rolled material that has been wound into a coil shape (the portion that has not been unwound yet) remains in the wound state. It can be removed from the coil box. In addition, the portion of the rough rolled material that has been unwound from the coil shape to the flat shape can be removed from the transfer table by being fed back to the upstream side. Here, in the hot rough-rolled material cutting method according to the present invention, it is preferable that the cutting position of the unrolled rough-rolled material is 1 to 5 m from the delivery cradle roll provided in the coil box. Thereby, the portion of the coarsely-rolled material wound up in the coil shape can be removed from the coil box in a wound state, and the portion of the rough-rolled material unwound from the coil shape to the flat plate shape is By sending the sheet backward to the upstream side, it is possible to define a position where the sheet can be removed from the transfer table.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an explanatory view showing a method for cutting a hot rough rolled material according to one embodiment of the present invention, and FIG. 2 is a front view of an automatic cutting machine applied to the method for cutting a hot rough rolled material. It is. As shown in FIG. 1, an automatic cutting machine 10 applied to a method for cutting a hot rough rolled material according to an embodiment of the present invention uses a rough rolling mill (not shown) provided on an upstream side to roughly roll. Finished rolling mill (not shown) provided on the downstream side of the rolled rough rolled material 11
It is provided in the vicinity of the coil box 12 which can be rewound. The details will be described below.

[0007] As shown in FIG. 2, the automatic cutting machine 10 is configured to rewind the rough rolled material 1 from the coil box 12 after the rough rolling.
Above 1, there is a guide member 13 provided along the width direction of the rough rolled material 11. A carriage 15 having wheels 14 is provided at the upper end of the guide member 13, and a traveling rail 16 is provided so that the carriage 15 can reciprocate in the width direction of the rough rolled material 11. The cart 15 is provided with a cutting torch 17 at a lower end thereof so as to be substantially perpendicular to the rough rolled material 11 and a height adjusting device 18 for adjusting the height of the cutting torch 17. ing. Therefore, the height of the cutting torch 17 can be adjusted according to the thickness of the rough rolled material 11 after the rough rolling.

A guide member 19 provided in parallel with the running rail 16 is provided above the running rail 16. The guide member 19 guides a hose 20 that supplies gas to the cutting torch 17. Since the hose 20 is attached to the guide member 19 via the hanging portion 21, the hose 20 is mounted on the traveling rail 16. It does not hang down. Note that one end of the hose 20 is connected to the gas cylinder 22 and the other end is connected to the cutting torch 17 so that gas can be supplied to the cutting torch 17. Here, the type of gas used is L
PG (liquefied petroleum gas: Liquidified Petro
leum Gas) and oxygen. By using the automatic cutting machine 10 described above, as in the case where the rough-rolled material 11 is cut by hand, a person can approach the rough-rolled material 11 first. After cooling,
The rough-rolled material 11 can be cut in a high temperature state without taking the method of cutting the rough-rolled material 11. Therefore, workability is improved.

[0009] As shown in FIG.
Has a bending device 31 that bends the rough rolled material 11 conveyed on a conveyance table constituted by the table rolls 30 from the rough rolling mill on the upstream side. Here, each table roll 30 is supported by support portions 43 and 44 on both sides so as to be rotatable about the axis of the table roll 30 (see FIG. 2). In addition,
The one support portion 43 is provided with a motor (not shown) for driving the table roll 30 to rotate.

The bending device 31 has, for example, two bending rolls 32 on the upper surface side and one bending roll 32 on the lower surface side of the rough rolled material 11 so as to bend the conveyed rough rolled material 11 at a required curvature. ing. The bending roll 32 on the lower surface side of the rough rolled material 11 is disposed between the two bending rolls 32 on the upper surface side of the rough rolled material 11, and the three bending rolls 32 are provided on a roll support plate 33.
Are rotatably supported. The three bending rolls 32 are driven by a motor (not shown). As a result, when the rough rolled material 11 conveyed from the rough rolling machine is conveyed on the table roll 30 and supplied to the coil box 12, the required curvature is bent by the bending roll 32 while being guided by the guide rollers 34 on the lower surface. Bend at. The bent rough rolled material 11 is placed on an entrance cradle roll 35 rotatably supported by a roll support (not shown).
It is wound into a coil.

Then, in the coil box 12, the end of the rolled rough rolled material 11 is opened (rewinding) so that the rolled rough rolled material 11 becomes flat again at the time of unwinding. The peeler 36 having the (open end) function is used for the rough rolled material 11.
It is arranged above the entry cradle roll 35 so that it can be pressed against the cradle roll 35. Therefore, after the rough rolled material 11 is wound into a predetermined size, the peeler 36 is moved downward from above the entrance cradle roll 35. Here, the lower end of the peeler 36 is pressed against the outer periphery of the rolled rough rolled material 11, and the rolled rough rolled material 11 is placed on the entry cradle roll 35 at the center of the rolled rough rolled material 11. Is rotated in a direction opposite to the winding direction, so that the rolled rough rolled material 11 is rewound and opened. On the downstream side of the coil box 12, the unrolled open-ended rough rolled material 11
And a pinch roll 37 for transporting the rough rolled material 11 to the finishing mill. Therefore, the end portion of the unrolled rough rolled material 11 is moved to the table roll 30.
It is conveyed above and is pinched by the pinch roll 37.

The coil box 12 is provided with mandrels 38 on both sides of the entry cradle roll 35 (only one side is shown in FIG. 1). Mandrel 38
When the mandrel 38 is not used, the mandrel 3 is spaced apart from the outer peripheral portion of the cylindrical mandrel 38 by a certain distance.
8 is stored in a storage section 39 in which the storage unit 8 is stored. In addition, the mandrel 38 drives the motor 41 provided on the mandrel 38 to drive the wound rough rolled material 11 to unwind the finishing roll on the downstream side.
There is provided a transfer mechanism 42 that can transfer the data onto zero. As a result, the mandrel 38 projects from the storage sections 39 on both sides, so that the mandrel 38 supports the central portion of the rolled rough rolled material 11, and the transfer mechanism 42 transfers the rough rolled material 11 to the entry cradle roll. From 35, it is possible to transfer to the output side cradle roll 40. After the rough rolling material 11 is transferred by the transfer mechanism 42, the mandrel 38 continues to support the rough rolling material 11 when the rough rolling material 11 is rewound. The rough rolled material 11 thus wound is transferred from the entrance cradle roll 35 to the exit cradle roll 40, so that the entrance cradle roll 35 is transported to the coil box 12 next. It becomes possible to prepare to wind the rough rolled material.

Next, a method for cutting a hot rough rolled material according to an embodiment of the present invention will be described with reference to the automatic cutting machine 10 described above.
And the coil box 12. If the unwinding distance is short (the elapsed time from the start of unwinding is short) and the temperature of the rough rolled material 11 is high, the rough rolled material 11 can be re-wound by the coil box 12. But,
If the unwinding distance is long (the elapsed time from the start of unwinding is long) and the temperature of the rough rolled material 11 is low, the coil box 12 cannot rewind, so the rough rolled material 11 is cut. There must be. That is, in this method, a hot steel sheet is rolled by a rough rolling mill to form a rough rolled material 11, the rough rolled material 11 is wound around a coil box 12, and the rolled rough rolled material 11 is moved in the direction of a finish rolling mill. If the rough rolled material 11 cannot be unwound from the coil box 12 during the unwinding, the rough rolled material 11 is cut and the rough rolled material 11 being unwound from the coil box 12 is re-wound. . The details will be described below.

During the operation of hot rolling, the coil box 1
The rough rolled material 11 roughly rolled by the rough rolling mill provided on the upstream side of the roll 2 is wound up by the coil box 12, and the rolled rough rolled material 11 is transferred onto the output cradle roll 40 of the coil box 12. After being mounted, it is rewound to a finishing mill provided on the downstream side of the coil box 12. Here, when equipment failure or equipment abnormality occurs after the finish rolling mill, winding of the rough rolled material 11 after rough rolling in the coil box 12 and rough rolling material from the coil box 12 to finish rolling are performed. The rewinding of 11 is stopped.

By stopping the operation of the coil box 12 in this manner, the rough rolled material 11 which is being wound after the rough rolling is present on the entrance cradle roll 35, and is located on the exit cradle roll 40. Thus, there is a rough rolled material 11 in the middle of rewinding to finish rolling. At this time, the winding speed of the rough rolled material 11 after the rough rolling is 250 to 300 m.
pm, rewind speed to finish rolling is 30-60 mpm
Therefore, the rewind speed is lower than the rewind speed. The size of the roughly rolled material 11 after unwinding is about 35 to 40 mm in thickness and about 700 to 1800 mm in width, and the temperature immediately after the start of unwinding of the roughly rolled material 11 in the coil box 12 is about 1000 ° C. In order to rewind the rough rolled material 11 that has been unwound in the finishing mill on the downstream side of the coil box 12 with the coil box 12, the rough rolled material 11 has a temperature of about 700 to 1000 ° C. Is preferred.

First, since the rough rolled material 11 being wound has been roughly rolled by a rough rolling mill, it has a temperature of about 1000 ° C. or more, and can be easily wound by the coil box 12. Therefore, the rough rolled material 11 is completely wound. Thus, the rolled rough rolled material 1 wound into a coil shape
1 is transported while being held between hooks or the like, so that the rough rolled material 1
1 can be removed from the coil box 12.

On the other hand, the rough-rolled material 11 being unwound cannot be re-wound in the coil box 12 because the temperature of the rough-rolled material 11 is lowered for the above-described reason. Therefore, the unrolled rough rolled material 11 is re-wound in a place where it can be wound again by the coil box 12 by the automatic cutting machine 10 arranged in the vicinity of the coil box 12, that is, in the vicinity of the coil box 12. Cut in the width direction. Here, first, in order to cut the rough rolled material 11, the height of the cutting torch 17 is adjusted by a height adjusting device 18, and then gas is supplied from the gas cylinder 22 to the cutting torch 17.

Next, the carriage 15 provided with the cutting torch 17 is moved along the running rail 16 in the width direction of the rough rolled material 11.
Run along. Thereby, the rough rolled material 11 is cut in the width direction of the rough rolled material 11. In addition, the cutting position of the unrolled rough rolled material 11 is 1 to 5 m from the delivery cradle roll 40 provided in the coil box 12. This is because if the rough rolled material 11 is less than 1 m, it cannot be cut because the rough rolled material 11 is not flat.
Cut the coiled rough rolled material 1 from the coil box 12
This is because the unwound flat portion is long when the 1 is lifted, which hinders handling. Therefore, it is more preferable that the thickness be 1 to 4 m, and more preferably 1.5 to 3.5 m.

The upstream portion of the rough rolled material 11 cut by the cutting torch 17 is completely wound by the coil box 12 and then transported by being sandwiched by hooks or the like.
It can be removed from the coil box 12. On the other hand, the downstream side portion of the rough rolled material 11 cut by the cutting torch 17 reversely rotates the table roll 30 to reversely feed the rough rolled material 11 to the upstream side. The rough rolled material 11 is removed from the transfer table by extruding the material. According to the above method, it is possible to efficiently remove the rough rolled material 11 being wound or unwound from the coil box 12 or the transfer table in a short time.

In the above embodiment, the location of the automatic cutting machine is on the downstream side of the coil box. Therefore, the method of hot rolling the rough rolled material at that time is as follows.
An automatic cutting machine is arranged for either finishing rolling of each book or placing a joining machine on the downstream side of the automatic cutting machine, and joining and finishing rolling a plurality of unrolled rough rolled materials. It is possible. Further, in the above embodiment, the automatic cutting machine is fixed to the downstream side of the coil box. However, the automatic cutting machine may be provided with a moving means capable of moving in the longitudinal direction of the rough rolled material. At this time, the position where the rough rolled material on the downstream side of the coil box can be re-wound (position of about 700 to 1000 ° C.) is investigated by using a temperature sensor or the like, and the automatic cutting machine is moved to that position. The rough rolled material is cut in the width direction of the rough rolled material. Thereby, since it becomes possible to wind more unrolled rough-rolled material, the amount of rough-rolled material to be conveyed while being sandwiched by hooks or the like increases, and workability can be improved. .

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, but is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described. For example, in the above-described embodiment, a method of cutting a rough rolled material when an equipment failure, an equipment abnormality, or the like occurs after the finish rolling mill has been described. However, during rewinding, if rewinding becomes impossible due to some trouble, or if rewinding cannot be performed from the beginning (coarse rolled material temperature, rough rolled material is stuck in the finishing mill) In such cases, the method for cutting a hot rough rolled material of the present invention can also be applied.

[0022]

According to the method for cutting a hot rough rolled material according to the first and second aspects, the rough rolled material is cut in the width direction in the vicinity of the coil box, thereby winding the coil into a coil. Can be removed from the coil box in a wound state. In addition, the portion of the rough rolled material that has been unwound from the coil shape to the flat plate shape can be removed from the transfer table by being fed back to the upstream side. Therefore, since the restoration work in the rolling equipment can be performed in a short time, the workability is good and the rolling can be economically performed. In particular, in the method for cutting a hot rough-rolled material according to claim 2, the cutting position of the unrolled rough-rolled material is set at 1 to 5 from an outlet cradle roll provided in a coil box.
m, the portion of the coarsely-rolled material wound up in the coil shape can be removed from the coil box in a wound state, and the portion of the coarsely-rolled material unwound from the coil shape to a flat plate shape Can be defined as a position that can be removed from the transfer table by being sent back to the upstream side. Therefore, the restoration work of the rolling equipment can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for cutting a hot rough rolled material according to an embodiment of the present invention.

FIG. 2 is a front view of an automatic cutting machine applied to the method of cutting a hot rough rolled material.

[Explanation of symbols]

10: automatic cutting machine, 11: rough rolled material, 12: coil box, 13: guide member, 14: wheel, 15: bogie, 1
6: running rail, 17: cutting torch, 18: height adjusting device, 19: guide member, 20: hose, 21: suspension, 22: gas cylinder, 30: table roll, 31:
Bending device, 32: bending roll, 33:
Roll support plate, 34: guide roller, 35: entrance cradle roll, 36: peeler, 37: pinch roll, 3
8: mandrel, 39: storage section, 40: outgoing cradle roll, 41: motor, 42: transfer mechanism, 43: support section, 44: support section

Claims (2)

[Claims] 1. A hot-rolled steel sheet is rolled by a rough rolling mill to form a rough rolled material, and the rough rolled material is wound into a coil box. When it is no longer possible to rewind the rough rolled material from the coil box, in the method of rewinding the rough rolled material being unwound from the coil box, rewinding of the rough rolled material in the coil box is performed. A method for cutting a hot rough rolled material, comprising cutting the rough rolled material unwound in the vicinity of the coil box in the width direction when it is not possible. 2. The method for cutting a hot rough rolled material according to claim 1, wherein a cutting position of the unrolled rough rolled material is set at a position from an outlet cradle roll provided in the coil box.
A method for cutting a hot rough rolled material, wherein the method is 5 m.