JP2965809B2 - Slab cutting / transporting method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and equipment for cutting and conveying slabs, and more particularly to a method and equipment for cutting and conveying slabs from a steelmaking process to a rolling process with a constant width. According to.

[0002]

2. Description of the Related Art In a steelmaking process, for example, the thickness of a slab discharged from a continuous casting facility is about 150 mm to 360 mm and has a constant thickness, and the width of the slab is about 700 mm to 2300 mm. . On the other hand, the longer the slab length, the heavier the weight. Therefore, when the slab is conveyed by a crane, for example, the maximum conveying capacity of the crane determines the upper limit of the slab length. Generally, the minimum length of the slab is determined by transport equipment such as a roll pitch of a transport roll and a pitch of a skid of a heating furnace.

FIG. 2 shows an embodiment according to the prior art. Large unit weight slab (Fig. 2 (a); width 2200mm, length 2)
(200 mm) is cast in a wide width, cut to a length that can be inserted into a heating furnace or longer, and placed on a skid (for example, a skid width of 2000 mm) and heated. Small single weight slab (Fig. 2 (b); width 153)
(0 mm, length 2200 mm) is cast with a narrow width to secure a length that can be charged into the heating furnace. The slab is cut, and the slab is heated on a skid without turning.

FIG. 3B is a diagram showing a cast knitting in continuous casting according to the prior art. Conventionally, orders that have been charged and knitted with different slab widths for the same steel type have been tapped and cast using casts with different slab widths (for example, even for steel type A, narrow and wide widths are tapped with different casts). This has led to a reduction in tapping lots, an increase in seams of different steel grades, and an increase in off-order slabs.

FIG. 5 is a diagram showing a slab cutting flow according to the prior art. In the slab receiving process, a slab (2000 to 12800 mm long, for example, 1
2000mm length) is supplied to the receiving / cutting line by a tong crane. In the fixed-size slab cutting step, a fixed-size (2000) is used by using the cutting device 1 for cutting the slab into a plurality.
(Up to 4600 mm length, for example, 3000 mm length). In the slag removing process, the fixed-length slab is transported on a transfer table, and slag generated when cutting the gas is removed by the slag removing device 4. In the marking process 3, slab recognition is performed on the hot and cold pieces using the markings 5. For marking the identification number. In the payout process, the fixed-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 / transporting method" according to the prior art has the following problems. Small single weight slabs cannot be sampled from wide slabs, and continuous casting width cannot be reduced to one width (width aggregation). Due to the decrease in continuous casting capacity and the reduction of the tapping lot, the number of slabs out of order increases and the yield decreases. Large single slabs cannot be sampled from wide slabs, and the number of rolls and skids is large in order to shorten the equipment behind the continuous casting equipment, such as the roll pitch of the transfer table and the skid interval of the heating furnace. And equipment costs increase.

The present invention advantageously solves the above-mentioned problems of the prior art. The slab discharged from the steel making process can always be conveyed to the rolling process at a constant width.
An object of the present invention is to provide a transport method and equipment for the transport method.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a slab is continuously dispensed at a constant width in a steel making process, and when the slab is cut into a plurality of pieces, the length of the cut slab is set to a length of the transport roll after cutting. When the maximum length of the pitch or the maximum length of the skid of the heating furnace is smaller, the cut and transport method of the slab is characterized in that the cut slab is rotated by 90 ° and the width and length of the slab are exchanged and transported. It is an abstract.
Further, the present invention is characterized in that, in the above method, when the slab is continuously dispensed at a constant width in the steel making step, the width of the slab is the maximum width that can be produced in the steel making step. Furthermore, the cutting / transporting equipment of the present invention is characterized by comprising a cutting device for cutting the slab discharged from the steelmaking process into a plurality of pieces, and a width changing device for turning the plurality of cut slabs by 90 °. .

[0009]

FIG. 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 with a wide width, cut into pieces that are longer than can be inserted into a heating furnace, and placed on a skid (for example, a skid width of 2000 mm) and heated. Small single weight slab (Fig. 1 (b); width 2200m
m, 1530 mm in length), and after cutting, the slab is turned 90 ° and the width is changed. Then, the slab is charged into a heating furnace and placed on a skid for heating.

FIG. 3A is a view showing a 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 casts and No. 2 casts, and are generally tapped and cast using casts having different slab widths. In the present invention, for example, A, B,
When casting steel types having four different components of C and D, the number of different steel type joints (about 1 to 4 m; yield loss) is reduced twice (marked with ▼) as compared with the conventional method.

The cutting / transporting equipment of the present invention cuts a slab discharged from steelmaking equipment such as a continuous casting machine into a fixed size and then inserts the slab into a next heating furnace. Means and a marking means.
That is, as shown in FIG. 6, a second gas cutter 2 for dividing and cutting the slab which has been cut into fixed lengths into shorter slabs is provided at the rear of the gas cutter 1 which is used to cut fixed length slabs. Further, after the gas cutter 2, a slag removing device 4 for removing slag of the slab being conveyed is disposed together with a width changing device 3 for rotating a plurality of slabs cut in a short length by 90 ° (width changing). is there. A marking device 5 for giving an identification number or the like to the slab is provided after the width and length changing device 3 and the slag removing device 4, and a depiler 6 for supplying the slab to the charging table of the heating furnace 7 is further provided. I have.

As the width and length changing device 3 for rotating the short slab by 90 °, there is provided a bogie that runs parallel to the upper part 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 from the carriage, and a tongue for gripping a slab is provided at a lower end of the arm. The bogie is synchronized with the slab while the slab is sandwiched from both sides by the tongs, and the arm is rotated at a predetermined position to rotate the slab by 90 °. It is a matter of course that other known structures and types may be adopted as the width and length changing device.

FIG. 4 is a diagram showing a slab cutting flow according to the present invention. In the slab receiving process, a slab (2000 to 12800 mm long, for example, 1
2000mm length) is supplied to the receiving / cutting line by a tong crane. In the fixed-size slab cutting step, a fixed-size (2000) is used by using the cutting device 1 for cutting the slab into a plurality.
(Up to 4600 mm length, for example, 3000 mm length). In the short-length slab cutting step, the fixed-length slab cut in the fixed-length slab cutting step is cut into short lengths (replacement of width and length, 1000 to 2) using the cutting device 2.
Cut into slabs (200 mm length, for example 1500 mm length). In the slag removal + width replacement process, the fixed-length slab is transported on a transfer table, and the slag removal device 4 removes slag generated during gas cutting. Is carried out to remove slag generated during gas cutting, and thereafter, the short slab is turned by 90 °. In the marking step, a marking device 5 is used to mark a hot piece and a cold piece with an identification number for slab recognition. In the dispensing process, the fixed-length slab and the short-length slab are depiled by a tong crane 6.
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 from the slab cutting / transporting method and equipment according to the present invention described above. Small single-weight slabs can be sampled from wide slabs, and the continuous casting width can be reduced to one width (width consolidation), thereby improving continuous casting capacity and reducing unordered slabs by increasing the number of tapping lots. Small single-weight slabs can be sampled from wide slabs, and equipment (e.g., roll pitch of a transfer table, skid interval of a heating furnace, etc.) behind the continuous casting equipment can be designed with the maximum continuous slab width. Significant equipment cost reduction is possible.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the principle of a cutting / conveying method according to 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 in the conventional continuous casting.

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

FIG. 5 is a slab cutting flow diagram of a conventional technique.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Standard-size cutting device (gas cutter) 2 Short-length cutting device (2nd gas cutter) 3 Width and length replacement device 4 Scraper removal device 5 Marking device 6 Depylar 7 Heating furnace

Continuation of the front page (56) References JP-B 56-3128 (JP, B2) JP-B 56-2285 (JP, B2) JP-B 38-2116 (JP, B1) JP-B 41-19049 (JP, B1) , B1) JP 47-4928 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 39/20 B21B 15/00

Claims (3)

(57) [Claims] 1. A slab in a steelmaking process is continuously dispensed at a constant width, and when the slab is cut into a plurality of pieces, a length of the cut slab is set to a maximum length of a conveying roll pitch after cutting or a heating furnace. If the skid's maximum length is less than
A slab cutting / conveying method characterized in that a cut slab is turned by 90 ° and conveyed while changing the width and length of the slab. 2. The slab width according to claim 1, wherein the slab width is the maximum width that can be manufactured in the steelmaking process when the slab is continuously discharged at a constant width in the steelmaking process.
Transport method. 3. A cutting device for cutting a slab discharged from a steel making process into a plurality of pieces, and a slab cut into a plurality of pieces by a 90.
° A slab cutting / transporting facility characterized by comprising a width changing device for turning.