KR20170054601A - Slab processing appratus - Google Patents
Slab processing appratus Download PDFInfo
- Publication number
- KR20170054601A KR20170054601A KR1020150156463A KR20150156463A KR20170054601A KR 20170054601 A KR20170054601 A KR 20170054601A KR 1020150156463 A KR1020150156463 A KR 1020150156463A KR 20150156463 A KR20150156463 A KR 20150156463A KR 20170054601 A KR20170054601 A KR 20170054601A
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- KR
- South Korea
- Prior art keywords
- unit
- torch
- slab
- torch unit
- casting
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Abstract
Description
BACKGROUND OF THE
Generally, the slabs produced in the continuous casting process have many surface defects such as pinholes, inclusions and micro cracks on the surface, and they are severe in high grade steel. Rolling of such a surface-defective cast steel in a rolling mill causes a failure such as a plate break or a defect in the produced hot-rolled coil. Therefore, the cast steel is subjected to scarfing work to remove defects by spalling the surface layer after continuous casting and then hot rolling.
The scarping operation is known as a method of removing defects by sputtering the surface layer (top surface, bottom edge, etc.) of the casting with a torch unit while transferring the casting from the run-out table.
However, when the continuous casting process, the scarifying process, and the hot rolling process are performed in-line, the feed rate of the cast steel may be changed according to the production rate of the cast steel. In a conventional cast steel processing apparatus, There is a problem in that it is difficult to realize uniform scatting as a whole because the injection of the torch unit is kept constant. Particularly, a cast steel having a relatively thin thickness (40 to 120 mm) is continuously produced in the casting process and the casting speed is changed in accordance with the operating conditions. Therefore, the casting speed of the cast steel varies, It has been difficult to control the amount of scrap depending on the conveying speed.
In addition, such a batch processing apparatus needs periodic inspection and maintenance of the torch unit. Since the torch unit is located on the transfer line of the main body, it is difficult to perform maintenance and maintenance, and there is a problem that the work must be stopped for maintenance and maintenance.
An embodiment of the present invention is to provide a billet processing apparatus capable of controlling the scatting amount in such a manner that the spraying angle of the torch unit is controlled in accordance with the feed rate of the cast steel.
The embodiment of the present invention is intended to provide a casting apparatus capable of easily performing inspection and maintenance of a torch unit.
According to an aspect of the present invention, there is provided a conveyance line for conveying a slab; A torch unit for removing defects by scarring the surface layer of the casting conveyed; A support unit for supporting the torch unit; And a spraying angle adjusting unit for controlling the scraping amount by adjusting the spraying angle of the torch unit according to the feeding speed of the casting jig.
Wherein the spray angle adjusting unit comprises a torch unit driving unit for operating at least one of the torch unit and the supporting unit to adjust a tilt of the torch unit to adjust the spray angle, And a controller.
The control unit may receive the feed information from at least one of the continuous casting machine, the feed line, and the feed detection unit to sense the feeding of the cast steel, and control the operation of the torch unit driving unit.
The spray angle adjusting unit may increase the spray angle when the feeding speed of the cast steel becomes faster and decrease the spray angle when the feeding speed of the cast steel becomes slower.
According to another aspect of the present invention, there is provided a conveying line for conveying a slab; And a scarifying device having a torch unit for scarifying the surface layer of the casting being conveyed to remove defects and a supporting unit for supporting the torch unit and capable of moving to a maintenance position on the side of the conveying line .
The support unit may include a first support unit and a second support unit that move in a direction intersecting with the feeding direction of the casting, respectively, wherein the torch unit includes a first torch unit installed in the first support unit, And a second torch unit installed in the second supporting unit.
The first torch unit and the second torch unit move in the lateral direction along the guide rails to work alternately while moving in mutual close contact with each other in order to perform continuous scarping.
The slab processing apparatus according to the embodiment of the present invention can adjust the scraping amount by adjusting the inclination angle of the torch unit according to the feeding speed of the cast steel to adjust the angle of spraying so that even when the feeding speed of the cast steel is changed, And the amount of scaping can be kept constant.
The slab processing apparatus according to the embodiment of the present invention can move the torch unit from the working position on the transfer line to the maintenance position on the side of the transfer line so that the inspection and maintenance can be easily performed.
The slab processing apparatus according to the embodiment of the present invention can work alternately between the two torch units and can realize continuous scaping while moving in mutual close contact state when the two torch units are alternated with each other. Thus, even if the tasks of the two torch units are alternated for inspection and maintenance, an uninterrupted scarping operation can be performed.
1 is a conceptual diagram of a slab processing apparatus according to an embodiment of the present invention.
Fig. 2 is a flowchart showing a casting method using the casting machine of Fig. 1. Fig.
3 is a conceptual diagram of a slab processing apparatus according to another embodiment of the present invention.
Fig. 4 is a flowchart showing a processing method of the cast steel using the cast steel processing apparatus of Fig. 3;
5 is a perspective view showing a scarfing apparatus of a slab processing apparatus according to an embodiment of the present invention.
6 is a side view showing a scarfing apparatus of a slab processing apparatus according to an embodiment of the present invention.
7 shows an example of moving the scarifying device of the slab treating apparatus according to the embodiment of the present invention to the maintenance position.
Fig. 8 shows another example of a scarfing apparatus of the slab treating apparatus according to the present invention, in which a plurality of torch units are alternately operated.
9 and 10 show an example of adjusting the spraying angle of the torch unit according to the feeding of the cast steel in the scarfing apparatus of the slab treating apparatus according to the embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs, and the present invention is not limited thereto, but may be embodied in other forms. In order to clarify the present invention, it is possible to omit the parts of the drawings that are not related to the description, and the size of the components may be slightly exaggerated to facilitate understanding.
The cast steel described in the present invention refers to a material that is produced in a continuous casting machine and before final rolling (finish rolling). The concept of in-line is that the equipment such as continuous casting machine, reheating means, rough rolling mill, rolling mill, cooling means, winder, etc. are connected to the casting feed line (runout table) .
FIG. 1 is a conceptual view showing a method of producing a hot-rolled steel sheet by producing a cast steel S having a thick thickness S, that is, a steel strip S having a thickness of 120 to 500 mm, using the cast steel processing apparatus to which the present invention is applied. Fig. 2 is a flowchart showing a casting method using a casting machine. Fig.
As shown in the drawing, a casting method according to an embodiment of the present invention includes a casting preparation step S110 for producing a casting S in a
The post-treatment step includes a rolling step (S140) of hot rolling the cast steel (S) to produce a steel sheet. Further, the slab processing method may include a detecting step (S150) of detecting surface defects in the upper and lower regions of the slab S before or after the scarping step (S120) and at a predetermined point thereafter.
The slab preparing step S110 is a step of producing a slab S used as a material for hot rolling and continuously producing a slab S having a thickness of 120 to 500 mm by using the
The
The slab S cut by the
The scarping step S120 scans the upper and lower regions of the cast slab S being conveyed by the
The reason for scapping the upper and lower regions of the slab S before the central portion temperature of the slab S is cooled to less than 600 ° C is to shorten the process of preheating the cooled slab S separately to a temperature at which scarfing is possible Or omitted to improve the process speed and to prevent cracks from growing due to cooling of the slab S and generation of new cracks.
The scarping step S120 is not limited to the
The scalloped steel strip S can be immediately charged into the
When the scaping of the upper and lower regions of the slab S is performed before the center temperature of the slab S is cooled to less than 600 ° C, the time required for preheating the slab S to the scapable temperature can be shortened, (S) without surface defects can be produced because defects in the upper and lower surface regions and the right and left edge regions can be removed even in a high-temperature steel slab (S) such as a high alloy steel at a high temperature It becomes.
The scaping step S120 may include a detection step S150 for detecting surface defects in the upper and lower regions and the left and right edge regions of the cast S and the scaping step S120 may be performed in accordance with the detection result of the surface defects. The operation of the
The detection step S150 may be performed before the scarping step S120 to detect surface defects and then control the scarping step S120 correspondingly. Instead, as shown in Fig. 2, (S130), that is, at a predetermined point in the reheating step (S130) or the rolling step (S140). Therefore, when defects are detected in the intermediate cast steel product and the hot rolled steel product as a final product, the data can be fed back to be applied as a control factor in the production of the following cast steel and hot rolled steel. That is, the detecting step S150 may be performed before or after the scarping step S120, or may be performed in various steps. Of course, it is also possible to perform scaping on the upper and lower regions and the left and right edge regions of the cast S without performing the detection step S150 during the casting process.
The reheating step S130 is to heat the screed S to the reheating means 40 and to the recrystallization temperature or higher for hot rolling before the temperature of the central portion of the screped casting S is cooled to less than 600 占 폚. That is, the temperature of the slab S is raised to the recrystallization temperature of about 1250 ° C.
The rolling step S140 is a step of hot rolling the cast slab S to produce a hot rolled steel sheet (hot rolled coil) as a final product. The slab S is hot rolled to a desired thickness in the rolling
Fig. 3 shows a casting apparatus for producing a hot-rolled steel sheet while continuously producing a relatively thin cast steel (S, 40 to 120 mm) in a mode different from that of the casting apparatus described above, and Fig. 4 shows a casting process using the same .
As shown in Figs. 3 and 4, the casting method includes a casting preparation step S210 for producing a casting S in the
The cast slab preparation step (S210) produces the slab S in the continuous casting machine (10). Since the slab S having a thickness of about 40 to 120 mm produces the slab S at a high speed casting, it is possible to prevent the occurrence of minute cracks near the oscillation mark at the edge of the slab and the presence of inclusions, pinholes, Lt; / RTI > Such defects such as fine cracks may be oxidized by the atmosphere inside the reheating means 40 in the reheating step, and cracks may be further exacerbated. Therefore, the scarping step S220 is preferably performed before the reheating step S230 to remove cracks and other defects in advance.
The scarping step S220 scans the upper, lower surface area, and left and right edge areas of the cast slab S being conveyed to remove defects on the surface and the edge of the slab S, respectively. As in the above example, the
In the reheating step S230, the scrapped cast steel S is charged into the reheating means 40 and reheated, so that the temperature of the cast steel S, which has a thin thickness and is unevenly cooled, is uniformly maintained, Prevent defects. A tunnel-type tunnel furnace can be used as the reheating means 40, and the temperature distribution can be uniformly maintained while the slab S passes through this uniform furnace.
The rolling step S240 is a step of hot-rolling the slab S to produce a hot-rolled steel sheet (hot-rolled coil), which is a final product. Since the thin slab S has a relatively thin thickness, the rough rolling process may not be separately performed.
The slab processing method may include a detecting step (S250) of detecting a defect on the surface of the slab S before or after the scarping step S220, as shown in Fig. That is, after the casting preparation step S210, after the reheating step S230, and during the rolling step S240.
As in the example shown in FIG. 4, the scarping step S220 may be performed after the reheating step S230. The scarping step S220 performed at this time can remove all the cracks and defects generated and grown in the slab preparing step S210 and the reheating step S230 and therefore the scarping step S220 of the slab S entering the rolling step S240 Quality can be improved.
5 and 6 illustrate a
The
The
The
The upper and
The collecting
The
The
6, the spray
6, 9, and 10, the torch
The control unit of the spray
9, when the feed speed of the slab S is slow, the spray
This is because, even if the feed rate of the cast steel S varies depending on the operating conditions, even if the feeding speed of the cast steel is changed, stable scuffing is realized by controlling the scuffing amount through the control of the spray angle and the scuffing amount is kept constant In order to make it possible.
In general, the control method of the scrapping amount is to control the feed rate of the cast steel and the feed flow rate of the fuel gas. However, since the feed rate of the cast steel is related to the productivity of the cast steel, There is a limit to use in scaping amount control due to the problem that scaping does not occur below a certain pressure.
However, if the scapping amount is adjusted by controlling the spray angles? 1 and? 2 as in the present embodiment, it is possible to control the scrap amount by controlling the injection angle? Even when the conveyance speed of the convenience is changed, a stable scarping operation can be performed by controlling the amount of scatting.
7 shows an example of moving the
8 shows another embodiment of the scarping device. The example of FIG. 8 shows a scarfing device having two
Therefore, when the
In the example of FIG. 8, when the
10: Continuous casting machine, 30: Transfer line,
40: reheating means, 70: rolling mill,
80: cooling means, 90: winder,
100: Scarping device, 110: Torch unit,
120: support unit, 130:
131: torch unit driving unit, 140: collecting unit,
150: defect detection unit, 160: position detection unit,
170: guide rail.
Claims (10)
A torch unit for removing defects by scarring the surface layer of the casting being transferred;
A support unit for supporting the torch unit; And
And a dispensing angle adjusting unit for adjusting the dispensing angle of the torch unit according to the feeding speed of the casting jig to control the scaling amount.
The spray angle adjuster
A torch unit driving unit for operating at least one of the torch unit and the supporting unit to adjust a tilt of the torch unit to adjust the spray angle;
And a control unit for controlling the operation of the torch unit driving unit on the basis of the feed information of the cast steel.
Wherein the control unit controls the operation of the torch unit driving unit by receiving the feed information from the continuous casting machine, the feed line, and the feed detection unit for detecting the feed of the main feed.
Wherein the spray angle adjusting unit increases the spray angle when the feeding speed of the cast steel becomes faster and decreases the spray angle when the feeding speed of the cast steel becomes slower.
Wherein the support unit is movable along a guide rail in a lateral direction intersecting with a conveying direction of the casting.
Wherein the support unit includes a first support unit and a second support unit provided on both sides of the guide rail,
Wherein the torch unit includes a first torch unit installed on a first support unit, and a second torch unit installed on the second support unit.
Wherein the first torch unit and the second torch unit move in a lateral direction along the guide rails to work alternately while moving in mutual close contact upon alternation of tasks to allow continuous scarping.
And a scarifying device having a torch unit for scarifying the surface layer of the casting conveyed to remove defects and a supporting unit for supporting the torch unit and capable of moving to a maintenance position on the side of the conveying line.
Wherein the support units each include a first support unit and a second support unit that move in a direction intersecting with a feeding direction of the casting,
Wherein the torch unit comprises a first torch unit mounted on a first support unit and a second torch unit mounted on the second support unit.
Wherein the first torch unit and the second torch unit move in a lateral direction along the guide rails to work alternately while moving in mutual close contact upon alternation of tasks to allow continuous scarping.
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KR1020150156463A KR101751280B1 (en) | 2015-11-09 | 2015-11-09 | Slab processing appratus |
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KR1020150156463A KR101751280B1 (en) | 2015-11-09 | 2015-11-09 | Slab processing appratus |
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KR101751280B1 KR101751280B1 (en) | 2017-06-28 |
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Cited By (1)
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KR101944193B1 (en) * | 2017-10-16 | 2019-01-30 | 주식회사 포스코 | Slab scarfing treatment system and method using the same |
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KR200328852Y1 (en) * | 2003-06-17 | 2003-10-04 | 주식회사 포스코 | Crop cutting apparatus of scarfing utility |
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KR101944193B1 (en) * | 2017-10-16 | 2019-01-30 | 주식회사 포스코 | Slab scarfing treatment system and method using the same |
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