JPH0824921B2 - Steel strip manufacturing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steel strip manufacturing apparatus which is arranged in series with a continuous casting machine and a hot rolling mill to continuously manufacture a steel strip from molten steel.

[Prior Art] Generally, a slab produced by a continuous casting machine is cut into a slab or another size product, and then separated from the continuous casting machine to form a steel strip by a hot rolling machine provided at another place. Manufacturing.

However, in recent years, the hot rolling mill was directly connected to the continuous casting machine,
A hot-rolled steel strip manufacturing apparatus has been proposed in which a continuously cast slab is wound into a coil, and then the coil is unwound and supplied to a hot rolling mill to directly roll the hot-rolled steel strip. ing.

In this type of apparatus, one or more continuous casting machines are arranged on the inlet side of the hot rolling mill, and each continuous casting machine has one winding machine. . Therefore,
The slab cast by the continuous casting machine is wound into one coil. This coil is heated or heat-retained and then supplied to a hot rolling mill to produce a hot rolled steel strip.

[Problems to be Solved by the Invention] However, when a cast piece cast by a continuous casting machine of a steel strip manufacturing apparatus is wound on a coil, the thickness of the cast piece is such that a slab cast by an ordinary continuous casting machine is cast. It must be thin compared to the thickness of the piece. When the thickness of the slab is reduced, the production amount of the slab produced by the continuous casting machine per unit time is reduced, so that the production time of the slab of one charge of molten steel becomes long and the casting efficiency is lowered. There is a point.

In particular, in the case of manufacturing a slab having a narrow width, the production time of the slab in one charge of molten steel becomes longer due to the decrease in the casting efficiency, and as a result, the temperature of the molten steel during casting and the time of contact with the atmosphere are increased. Since it is long, the slab oxidization state or temperature fluctuation in one charge of molten steel becomes large, and a slab of stable quality cannot be obtained.

In order to solve such a problem, it is possible to increase the casting speed of the continuous casting machine, but if the casting speed is raised too much, the quality will deteriorate due to the need for rapid cooling, and the coil after casting will be deteriorated. The casting speed of the continuous casting machine cannot be increased more than a predetermined value because there is a restriction on work such as the movement of the mold and the like cannot be processed quickly according to the casting speed.

The present invention has been made in view of such circumstances, and an object thereof is to provide a hot-rolled steel strip manufacturing apparatus which has a short casting time of a slab by a continuous casting machine and which is of high quality.

[Means for Solving Problems] A hot-rolled steel strip manufacturing apparatus according to the present invention comprises a continuous casting machine,
A winding machine that winds a continuously cast slab into a coil, a rewinding machine that rewinds the wound coil, and a hot rolling machine that hot-rolls the rewound casting slab. In a steel strip manufacturing apparatus for continuously manufacturing a steel strip from a molten steel, a width cutting machine is provided between the continuous casting machine and the winding machine to cut a slab along the conveying direction. ,
A plurality of the winding machines are arranged in parallel, and each slab cut by the cutting machine is simultaneously wound into a coil by each winding machine.

[Operation] The slab continuously cast by the continuous casting machine is cut along the lengthwise direction before the winding machine so that the winding width becomes narrow. Each of the cut slabs is simultaneously wound on a plurality of coils by a winder. Each coil is then rewound and hot rolled.

Embodiments Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5 of the accompanying drawings.

As shown in FIG. 1, the steel strip manufacturing apparatus 10 according to the embodiment of the present invention is provided with a horizontal continuous casting machine 12, and the continuous casting machine 12 includes a carrying table 14 and a pair of parallel arranged parallel casting machines. Winding machine 16, heat retention machine 18, rewinding machine 20, cropper 2
1. The hot rolling mill 22 and the coiler 24 are arranged in series in this order.

The horizontal continuous casting machine 12 is provided with a tundish 26, a ladle 28 for supplying molten steel to the tundish 26, and a pair of cooling belts 30 for producing molten slab by cooling while drawing molten steel from the tundish 26.

The slab cast by the continuous casting machine 12 is transported to the winder 16 by the transport table 14, and the transport path 14 is provided with a cutting machine 28 for cutting the slab S into a predetermined length. Guide roll 30, pinch roll 32, second guide roll 34,
And a third guide roll 36 is provided in this order. As shown in FIG. 2, between the pinch roll 32 and the second guide roll 34, there is provided a width cutting machine 38 for cutting the slab S into two parts along the conveying direction (longitudinal direction) thereof. It is arranged. A separator 40 is disposed between the second guide roll 34 and the third guide roll 36 to surely separate the cut slab.

As shown in FIG. 3, the width cutter 38 has a disc-shaped blade.
A pair of cutting rolls 44, 46 to which 42 is attached are arranged above and below the transport table 14. One end of each cutting roll is rotatably held by shaft boxes 48 and 50. The upper and lower shaft boxes 48, 50 are pressed by a screw down screw so that the upper and lower blades 42 have a predetermined opening.
The screw-down screws 52, 54 are connected to opening adjustment mechanisms 55, 56 for operating them. Reference numeral 57 is a housing of the width cutting machine 38.

As shown in FIG. 4, the separator 40 is provided with a separator roll 60 having a disk-shaped brim 58 attached to the center thereof, below the transport table 14. The brim 58 is provided so as to project upward from below the transport table, and is set so that the brim 58 is positioned upright at the cutting portion by the width cutting machine 38 described above so as to separate the cut steel material. There is. Both ends of the separator roll 60 are supported by a holding mechanism 62 so as to be movable up and down. The holding mechanism 62 is a lifting cylinder.
It is connected to 64 and its vertical movement is controlled.

Between the pair of winders 16 and the heat retainer 18, a pair of coil transfer devices 66 for lifting the coil wound by the winders.
And a coil moving device 68 movably provided along the width direction of the transport table. Each coil transfer device 66 supports a support shaft 70 that inserts a coil into the hollow of the coil wound by the winder and supports the support shaft 70 rotatably, and moves the coil from the winder 16 by a moving device. A pivoting mechanism 72 for moving to 68 is provided. The support shaft 70 is slid with respect to the housing 76 by the cylinder piston 74. The rotating mechanism 72 has a rotating shaft 78 that supports the housing 76,
It is composed of a rotary cylinder 80 that drives a rotary shaft 78.

The coil moving device 68 includes a rail 82 laid so as to traverse the transport table and a carriage that moves on the rail 82.
84 and are provided. The dolly 84 is driven on the rail 82 by a cylinder piston 86 connected to one end thereof. As shown in FIG. 2, the coil mounted on the trolley 84 is a heat insulator.
The coil on the carriage 84 is moved to the carrier table 18 and the heat retainer 18 is moved from here.

The rewinding machine 20 is provided with a cradle 88 for receiving the coil kept warm by the heat retainer 18, and a cradle roll 90 for rotatably supporting and rewinding the coil. A moving device 92 for moving to 90 is provided.

A runout table 23, which guides the rolled steel strip to the coiler while cooling the steel strip, is provided between the hot rolling mill 22 and the coiler 24.

 Next, the operation of this embodiment will be described.

The slab S cast by the continuous casting machine 12 is a pinch roll 32
Is conveyed in the direction of the arrow X and is positioned in the width direction by the first and second guide rolls 30 and 34. The slab S is then cut by the width cutter 38 at a position of about half of its width. The slab S cut along the longitudinal direction by the slicing machine 38 has the flange 58 of the separator 40 interposed at the cut end portion, and is reliably separated into two slabs of S1 and S2. . The separated slabs are guided by the guide rolls 36 and the respective slabs S1 by the winding device 16,
S2 is wound around the coils C1 and C2 in parallel and simultaneously. When the cast slab being wound is wound by a predetermined length, it is cut by the cutting machine 28.

On the other hand, the wound coils C1 and C2 are moved to a carriage 84 of a coil moving device 68 by a pair of coil transfer devices 66, respectively. In this case, as shown in FIG. 5, after the support shaft 70 is inserted into the hollow formed in the coil, the rotary shaft 78 is rotated and the coil C1 swings around the rotary shaft to wait in advance. It is moved to the expected trolley 84. The dolly 84 is positioned substantially at the center of the coil C1 and receives it, and then the dolly 84 is moved along the rail 82 by the cylinder piston 86, and on the transfer path of the heat retainer 18 located in the approximate center of the transfer table. Is set.

Then, after the coil C1 is loaded into the heat retaining device, the coil C2 is subsequently loaded in the same manner.

In the heat retention furnace 18, the rewinding machine is prevented while preventing the coil from being cooled.
Transfer to 20, but heat if necessary. The coil C4 conveyed to the rewinding machine 20 is rewound here, and the front and rear ends of the steel piece are cut by the cropper 21 and are conveyed to the hot rolling mill 22 to have a predetermined thickness. Rolled into steel strip. The rolled steel strip is sufficiently cooled via the run-out table 23 and wound up as a coil C5 by the coiler 24.

The present invention is not limited to the above-mentioned embodiment,
Various modifications can be made without departing from the scope of the present invention.

For example, the same effect can be obtained not only by using a horizontal continuous casting machine as a continuous casting machine but also by a vertical continuous casting machine.

Further, in the above-described embodiment, the steel slab is separated into two pieces along the width direction, but the invention is not limited to this, and it may be separated into three or four pieces. In this case, as many winding machines as the number of steel strips to be separated are provided.

[Effects of the Invention] According to the present invention, since the slab is cut along the width direction and wound up, a slab with a wide width can be manufactured.
Therefore, since the casting amount of the slab per unit time increases, it is possible to shorten the casting time by the continuous casting machine per charge, and the slab does not come into contact with the atmosphere for a short time, so that the quality due to oxidation or cooling is improved. It can prevent the deterioration.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hot-rolled steel strip manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the apparatus of FIG. 1 taken along line II-II, and FIG. 4 is a front view of the separator, and FIG. 5 is a side view schematically showing the coil transfer device and the coil moving device. 10… Steel strip manufacturing equipment, 12… Continuous casting machine, 16… Winding machine, 22
… Hot rolling mill, 38… width cutting machine.

Claims (2)

[Claims] 1. A continuous casting machine, a winding machine for winding a cast piece continuously cast by the continuous casting machine into a coil, a rewinding machine for rewinding the wound coil, and a rewound cast piece. And a hot strip mill for hot rolling, in a steel strip manufacturing apparatus for continuously producing a steel strip from a molten steel, in a conveying direction of a slab between the continuous casting machine and the winding machine. A steel strip characterized in that it is provided with a width cutting machine for cutting along, the plurality of winding machines are arranged in parallel, and each slab cut by the cutting machine is wound into a coil shape by each winding machine at the same time. Manufacturing equipment. 2. A coil moving device for moving the coil wound by the winder along the width direction of the cast piece is provided between the winder and the rewinder. The steel strip manufacturing apparatus according to claim 1, wherein the coils wound by the coil are sequentially taken out and conveyed toward a rewinding machine.