JPH06238316A - Method for cutting, transporting slab and equipment therefor - Google Patents

Abstract

PURPOSE:To carry a slab to a rolling state at a fixed width in a method for cutting or transporting the slab. CONSTITUTION:When the slabs are delivered continuously at a fixed width in the steel making process to be cut in plural and the cut slab length is smaller than the maximum pitch length of a carrying roll after the slab is cut or the maximum skid length of a heating furnace, the cut slab is rotated 90 deg. and the slab width and the slab length are exchanged and carried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab cutting / conveying method and its equipment, and more particularly to a cutting / conveying method and equipment capable of conveying a slab from a steelmaking process to a rolling process with a constant width. Pertain to.

[0002]

2. Description of the Related Art In a steelmaking process, for example, a slab discharged from a continuous casting facility has a constant thickness of about 150 mm to 360 mm, and a width of the slab is about 700 mm to 2300 mm, which can be varied before and during casting. . On the other hand, the longer the length of the slab, the heavier the weight becomes. Therefore, for example, when the slab is transported by a crane, the maximum transport capacity of the crane determines the upper limit of the slab length. The minimum length of the slab is generally determined by the roll pitch of the transport roll, the pitch of the skid of the heating furnace, and other transport equipment.

FIG. 2 is a diagram showing an embodiment according to the prior art. Large single-weight slab (Fig. 2 (a); width 2200mm, length 2)
200 mm) is cast in a wide width, cut into a length that can be charged into a heating furnace, and cut on a skid (for example, a skid width of 2000 mm) for heating. Small unit weight slab (Fig. 2 (b); width 153
(0 mm, length 2200 mm) is cast in a narrow width to secure a length that can be charged into the heating furnace. Cut the slab and place it on the skid to heat without swirling.

FIG. 3 (b) is a view showing cast knitting in continuous casting according to the prior art. Conventionally, orders of charge knitting with different slab widths for the same steel type have been tapped and cast by castings with different slab widths (for example, steel type A is tapped by different casts for narrow width and wide width). This has led to a reduction in steel output lots, an increase in seams of different steel types, and an increase in out-of-order slabs.

FIG. 5 is a diagram showing a slab cutting flow according to the prior art. In the slab receiving process, the cast pieces (2000 to 12800 mm length, for example, 1
(2000 mm length) is supplied to the receiving / cutting line by the tong crane. In the standard length slab cutting process, a constant length (2000
Divide into slabs of up to 4600 mm long, eg 3000 mm long, up to 4 standard length slabs. In the slag removing process, the standard length slab is transported on the transport table, and the slag generated at the time of gas cutting is removed by the slag removing device 4. In the marking process 3, the marking 5 is used to recognize the slab on the hot piece and the cold piece. Mark the identification number for. In the payout process, the standard length slab is supplied to the depiler 6 using a tong crane. In the heating furnace charging step, the slab is supplied to the heating furnace 7 using the depiler 6 and the charging table.

[0006]

The "slab cutting / conveying method" according to the prior art has the following problems. Small single-weight slabs cannot be sampled from wide slabs, and continuous casting widths cannot be made wider (wider). Yield decreases due to increase in out-of-order slabs due to reduction in continuous casting capability and smaller steel output lot. It is not possible to sample small single-weight slabs from wide slabs, and the number of rolls and skids is large in order to shorten the equipment for processes after the continuous casting equipment, such as the roll pitch of the transfer table and the skid interval of the heating furnace. Will increase equipment costs.

The present invention advantageously solves the problems of the prior art as described above, and the slab delivered from the steelmaking process can be always conveyed in a constant width to the rolling process.
The purpose is to provide a transportation method and equipment therefor.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a slab in a steelmaking process which is continuously dispensed with a constant width, and when the slab is cut into a plurality of pieces, the length of the cut slab is a conveying roll after cutting. When the maximum pitch length or the maximum skid length of the heating furnace is less than the maximum slab length, the cut slab is rotated 90 ° and the width and length of the slab are exchanged. It is a summary.
Further, the present invention is characterized in that, in the above method, when the slab in the steel making process is continuously discharged with a constant width, the width of the slab is the maximum width that can be produced in the steel making process. Further, the cutting / conveying facility of the present invention is characterized by including a cutting device for cutting a plurality of slabs delivered from the steelmaking process, and a width changing device for rotating the plurality of cut slabs by 90 °. .

[0009]

1 is a diagram showing an embodiment according to the present invention.
Large single-weight slab (Fig. 1 (a); width 2200mm, length 220)
0 mm) is cast in a wide width, cut into a length that can be charged into a heating furnace, and cut on a skid (for example, a skid width of 2000 mm) and heated. Small unit weight slab (Fig. 1 (b); width 2200m
m, length 1530 mm) is also cast in a wide width, and after cutting, the slab is rotated 90 ° and the width is changed, and then the slab is loaded into a heating furnace and placed on a skid for heating.

FIG. 3 (a) is a view showing cast knitting in continuous casting according to the present invention. Conventionally, even with the same steel type, small single-weight slabs and large single-weight slabs are generally divided into No. 1 cast and No. 2 cast, and cast and cast in casts with different slab widths. In the present invention, by consolidating the narrow width into the wide width with the same slab width, for example, A, B,
When casting four different types of steel, C and D, the number of seams of different steel types (about 1 to 4 m; yield loss) is reduced twice (marked with ▼) compared to the conventional method.

The cutting / conveying equipment of the present invention is capable of removing a slag from a slab cast from a steelmaking equipment such as a continuous casting machine to a fixed length after the slab is cut into a constant length. It is provided at the position of the means and the marking means.
That is, as shown in FIG. 6, a second gas cutter 2 for cutting the slab that has been cut to a predetermined length into smaller slabs is provided behind the gas cutter 1 for cutting the slab at a fixed length. Further, after the gas cutter 2, a width length changing device 3 for turning a plurality of shortly cut slabs by 90 ° (width length changing) and a slag removing device 4 for removing slag from the slab being conveyed are arranged. is there. After the width changing device 3 and the slag removing device 4, a marking device 5 for giving an identification number or the like to the slab is provided, and subsequently, a depiler 6 for supplying the slab to the charging table of the heating furnace 7 is provided. There is.

As the width-changing device 3 for turning the short slab 90 °, there is provided a carriage which runs parallel to the upper side of the slab transfer table, as schematically shown in FIG.
A mechanism may be provided in which an arm rotatable around an axis is suspended on the carriage and a tongue for gripping a slab is provided at a lower end of the arm. With the tongue sandwiching the slab from both sides, the carriage is synchronized with the slab, and the arm is rotated at a predetermined position to rotate the slab 90 °. It is needless to say that this width / width changing device may have another known structure and type.

FIG. 4 is a diagram showing a slab cutting flow according to the present invention. In the slab receiving process, the cast pieces (2000 to 12800 mm length, for example, 1
(2000 mm length) is supplied to the receiving / cutting line by the tong crane. In the standard length slab cutting process, a constant length (2000
Divide into slabs of up to 4600 mm long, eg 3000 mm long, up to 4 standard length slabs. In the short length slab cutting step, the short length (width / width replacement, 1000-2
Cut into slabs 200 mm long, eg 1500 mm long). In the slag removing + width changing process, the fixed length slab is conveyed on the conveying table, and the slag generated at the time of gas cutting is removed by the slag removing device 4, and the short slab is moved by the width changing device 3 on the slag removing device 4. Is a step of removing slag generated at the time of gas cutting, and then turning the short slab 90 °. In the marking process, the marking device 5 is used to mark the hot and cold pieces with an identification number for slab recognition. In the payout process, the regular slab and the short slab are used by the depiler 6 using a tong crane.
To provide. In the heating furnace charging step, the slab is supplied to the heating furnace 7 using the depiler 6 and the charging table.

[0014]

The following effects can be expected by the slab cutting / transporting method and equipment according to the present invention described above. Small single-weight slabs can be sampled from wide slabs, the continuous casting width can be widened (widened), and continuous slabs can be improved in capacity and the number of unordered slabs can be reduced by expanding the tapping lot. Small single-weight slabs can be sampled from wide slabs, and equipment for processes after the continuous casting equipment (such as the roll pitch of the transport table and the skid spacing of the heating furnace) can be designed with the maximum width of the continuous slab. It is possible to significantly reduce equipment costs.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the principle of a cutting / conveying method of the present invention.

FIG. 2 is an explanatory diagram showing the principle of a conventional cutting / conveying method.

FIG. 3A is a view showing cast knitting in continuous casting according to the present invention. (B) is a figure which shows the cast knitting by the conventional continuous casting.

FIG. 4 is a slab cutting flow chart in the present invention.

FIG. 5 is a conventional slab cutting flow chart.

FIG. 6 is an explanatory plan view showing a specific example of the cutting / transportation facility of the present invention.

[Explanation of symbols]

 1 Fixed length cutting device (gas cutter) 2 Short length cutting device (2nd gas cutter) 3 Width / length changing device 4 Slap removal device 5 Marking device 6 Depiler 7 Heating furnace

Claims (3)

[Claims] 1. When a slab in a steelmaking process is continuously discharged with a constant width and the slab is cut into a plurality of pieces, the length of the cut slab is the maximum length of a conveyance roll pitch after the cutting or a heating furnace. If the skid maximum length is less than
A slab cutting / conveying method characterized in that the cut slab is rotated 90 ° and the width and length of the slab are exchanged for conveyance. 2. The slab cutting and slab cutting method according to claim 1, wherein the width of the slab is the maximum width that can be manufactured in the steelmaking process when the slab in the steelmaking process is continuously discharged with a constant width.
Transport method. 3. A cutting device for cutting a plurality of slabs delivered from a steelmaking process, and a slab cut into a plurality of 90s.
° Slab cutting / transporting equipment, which is equipped with a width-changing device that can swivel.