KR101685844B1 - Rolling control method of thick steel plate - Google Patents

Rolling control method of thick steel plate Download PDF

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Publication number
KR101685844B1
KR101685844B1 KR1020150134336A KR20150134336A KR101685844B1 KR 101685844 B1 KR101685844 B1 KR 101685844B1 KR 1020150134336 A KR1020150134336 A KR 1020150134336A KR 20150134336 A KR20150134336 A KR 20150134336A KR 101685844 B1 KR101685844 B1 KR 101685844B1
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KR
South Korea
Prior art keywords
rolling
cooling
rolled material
control
air
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KR1020150134336A
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Korean (ko)
Inventor
나두현
백인철
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현대제철 주식회사
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Priority to KR1020150134336A priority Critical patent/KR101685844B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/005—Control of time interval or spacing between workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The present invention discloses a back plate rolling control method. The method for controlling rolling of a heavy plate according to the present invention comprises the steps of: a control unit receiving a rolling schedule from an upper control device and performing primary rolling on a control rolled material through a roughing or finishing mill; The control unit performs primary rolling on the control rolled material, and then transfers the cooled rolled material to the exit cooling area on the exit side of the finishing mill to air-cool it; And performing a secondary rolling of the control rolled material through the finishing mill when the control unit has passed the air cooling time in the output cooling region.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rolling control method,

[0001] The present invention relates to a method for controlling rolling of a thick plate, and more particularly, to a method of controlling rolling of a rolled steel sheet by rolling a control rolled material and a general rolled material, So that the continuous rolling process can be continued.

In general, steel manufacturing involves a steelmaking process to produce molten iron, a steelmaking process to remove impurities from molten iron, a casting process to transform solid iron into solid, and a rolling process to make iron into steel or wire.

The casting process is a process in which liquid molten steel is injected into a mold and then cooled and solidified while passing through a continuous casting machine to continuously produce an intermediate material such as a slab or a bloom.

In this process, the slab is produced as a heavy plate through the rolling mill in the rolling process, or as a hot-rolled coil or hot-rolled steel sheet while passing through the hot rolling mill.

Further, in the rolling step, controlled rolling is performed to control the temperature for the purpose of miniaturizing the crystal grains to satisfy the property of high tension in order to produce high-strength steel.

Since this control rolling is very important for the miniaturization of ferrite, the steel is subjected to primary rolling at the recrystallization zone (temperature), followed by cooling, and then secondary rolling at the non-recrystallized zone where recrystallization does not occur.

A related prior art is Korean Registered Patent No. 1148950 (2012.05.22, Announcement, rolling method for high tensile steel).

The present invention provides a plate rolling control method for controlling the air-cooling standby position of a control rolled material when a control rolled material and a general rolled material are successively rolled, so that rolling can be continued with respect to the rolled material that follows the air- will be.

A thick plate rolling control method according to one aspect of the present invention is characterized in that in a thick plate rolling facility in which an inlet cooling region, a rough rolling mill, a shared cooling region, a finishing rolling mill and an outlet cooling region are sequentially arranged behind a heating furnace, Subjecting the controlled rolling material to primary rolling through a roughing or finishing mill in response to the rolling schedule; The control unit performs primary rolling on the control rolled material, and then transfers the cooled rolled material to the exit cooling area on the exit side of the finishing mill to air-cool it; And performing a secondary rolling of the control rolled material through the finishing mill when the control unit has passed the air cooling time in the output cooling region.

In the present invention, the step of air-cooling in the outgoing cooling zone comprises the step of performing primary rolling through the roughing or finishing mill for the first trailing control rolling material in the case where the first following rolling material is the controlled rolling material according to the rolling schedule ; And a step in which the control section performs primary rolling on the first trailing control rolled material and then air-cools in a shared cooling region between the roughing mill and the finishing mill.

In the present invention, the step of air-cooling in the shared cooling zone comprises: performing a primary rolling through a roughing mill for a second trailing control rolled material when the control section is a controlled rolling material, the second following rolling material according to the rolling schedule; And a step in which the control unit performs primary rolling on the second trailing control rolled material and then air-cools in the inlet cooling region on the side of the roughing mill.

In the present invention, the step of air-cooling in the shared cooling zone comprises the step of performing rolling through the roughing mill for the second trailing rolled rolled material when the control section is in accordance with the rolling schedule and the second trailing rolled material is ordinary rolled material .

The step of air-cooling in the exit cooling zone in the present invention includes the step of rolling the first following normal rolled material through a roughing mill or a finishing mill in the case where the first following rolled material is a general rolled material according to the rolling schedule .

The rolling process control method of the present invention adjusts the air-cooling standby position of the control rolling material when the control rolling material and the general rolling material are continuously rolled, thereby allowing the rolling material to follow the rolling material during the air- Can be improved.

FIG. 1 is a block diagram showing a rolling facility by a heavy plate rolling control apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a back plate rolling control apparatus according to an embodiment of the present invention.
FIGS. 3 to 5 are flowcharts for explaining a method for controlling the rolling process of a thick plate according to an embodiment of the present invention.
FIG. 6 is a block diagram for explaining a rolling process by a thick plate rolling control method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of controlling a rolling mill according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram of a rolling mill according to an embodiment of the present invention. FIG. 2 is a block diagram of a rolling mill control apparatus according to an embodiment of the present invention. Referring to FIG.

As shown in FIGS. 1 and 2, the heavy plate rolling is carried out by means of a heating furnace 10, a roughing mill 20 disposed behind the furnace 10, a finishing mill 30 and a facility equipped with an accelerating cooler 40 Rolling is performed.

Particularly, in the case of controlled rolling, primary rolling is performed in a recrystallization zone (temperature), secondary rolling is performed in a non-recrystallized region where recrystallization does not occur after waiting for air cooling, and the crystal grains are elongated and deformed The increase of the ferrite nucleation site due to the increase of the band increases the fine structure.

Thereafter, in the accelerated cooling step, the cooling water is injected through the accelerating cooler 40 so as to achieve the cooling termination temperature based on information such as the cooling start temperature and the cooling speed set in advance, thereby suppressing the growth of the crystal grains and obtaining the low- .

To this end, the plate rolling control device receives the rolling schedule for the rolled material, which the controller 70 sequentially receives for rolling, from the upper control device 50 and grasps the position of the rolled material from the position sensing part 60 The roller table drive unit 80 is operated for rolling so that the rolled material can be transferred to the roughing mill 20 and the finishing mill 30 for rolling.

The control unit 70 determines whether the rolled material, which is sequentially drawn in accordance with the rolling schedule, is a control rolled material or a general rolled material. In the case of the controlled rolled material, the control unit 70 performs primary rolling, (100) so as to perform air cooling so as to perform rolling on the following rolled material.

Thereafter, the control unit 70 determines whether the first rolled rolled material is the control rolled material or the normal rolled rolled material while the control rolled material is air-cooled waiting in the outgoing cooling area 100, After the primary rolling, the air is cooled and transferred to the shared cooling zone 200 between the roughing mill 20 and the finishing mill 30. After the air cooling standby time has elapsed, Rolling can be performed.

The controller 70 determines whether the second rolled rolled material is the rolled control rolled material or the rolled rolled rolled rolled material while waiting for the first rolled first rolled control rolled material in the common cooling zone 200, After the primary rolling is performed, primary cooling is performed, and the primary cooling material is transferred to the inlet cooling region 300 at the inlet side of the roughing mill 20 to wait for air cooling. Then, when the air cooling waiting time elapses, secondary rolling is performed for the second following control rolling material can do.

In the case of general rolled materials, after the rolling is performed, waiting is performed until the rolling is completed with respect to the preceding rolled material, and when the rolling is completed, the rolled material is taken out together and the rolling is completed.

The method of controlling the plate rolling control will be described in detail as follows.

FIGS. 3 to 5 are flowcharts for explaining a method for controlling the rolling process of a heavy plate according to an embodiment of the present invention, and FIG. 6 is a diagram for explaining a rolling process by the heavy plate rolling control method according to an embodiment of the present invention to be.

As shown in FIG. 3, in the rolling process control method according to an embodiment of the present invention, the control unit 70 receives the rolling schedule from the upper control unit 50 (S10).

In operation S20, the controller 70 determines whether the rolled material is a rolled material or a general rolled material according to the rolling schedule input in operation S10.

If the rolled material determined in step S20 is a general rolled material, the controller 70 performs rolling through the roughing mill 20 or the finishing mill 30 (S30).

At this time, the control unit 70 may simultaneously roll the rolled normal rolled material through the rough rolling mill 20 and the finishing rolling mill 30 in the case of a rolled material that follows in accordance with the rolling schedule or a general rolled material.

After the step S30, the control unit 70 takes out the rolled material that has been rolled (S80).

On the other hand, if the rolled material determined in step S20 is the controlled rolled material, the controller 70 performs the primary rolling through the roughing mill 20 or the finishing mill 30 (S40).

After performing the primary rolling on the control rolled material in step S40, the control unit 70 conveys the controlled rolling agent to the outgoing cooling area 100 on the exit side of the finishing mill 30 to wait for air cooling (S50).

Thereafter, the control unit 70 determines whether the air cooling time set in step S50 has elapsed (step S60).

If it is determined in step S60 that the air cooling time has not elapsed, the process returns to step S50 to continue the air cooling. If the air cooling time has elapsed, secondary rolling is performed on the controlled rolled material through the finishing mill 30 (S70).

If the secondary rolling is completed through step S70, the rolled material is taken out.

On the other hand, while the control rolled material is waiting for air cooling in the outgoing cooling zone 100 through step S50, the controller 70 can perform rolling on the first following rolled material.

More specifically, as shown in FIG. 4, the control unit 70 receives the rolling schedule from the host controller 50 (S510).

In step S520, the controller 70 determines whether the first rolled steel material is a rolled material or a general rolled material according to the rolling schedule input in step S510.

Then, if the rolled material determined in step S520 is the first trailing ordinary rolled material, the controller 70 performs rolling through the roughing mill 20 or the finishing mill 30 and then returns (S530).

After the return in the step S530, the waiting air circulation region 100 waits until the rolling of the control rolled material in the air cooling standby state is completed.

On the other hand, if it is determined in step S520 that the first following rolling material is the first following control rolling material, the controller 70 performs primary rolling through the roughing mill 20 or the finishing mill 30 (S540).

That is, as shown in (a) of FIG. 6, while the air in the cooling zone for air circulation in the outlet cooling region 100 is waiting for the control rolled material # 1 to pass through the roughing mill 20 or the finishing mill 30, Primary rolling can be performed on the continuous material (# 2).

After performing the primary rolling on the first trailing control rolled material in this manner in S540, the controller 70 controls the first trailing control rolling agent in the shared cooling region 200 between the roughing mill 20 and the finishing mill 30 (S550).

Thereafter, the control unit 70 determines whether the air cooling time set in step S550 has elapsed (S560).

If it is determined in step S560 that the air cooling time has not elapsed, the process returns to step S550 to continue to perform the air cooling. If the air cooling time has elapsed, the first posterior control rolled material is subjected to secondary rolling And returns (S570).

Also, while the first follower control rolled material is waiting for air cooling in the shared cooling zone 200 through step S550, the controller 70 can perform rolling on the second following rolled material.

More specifically, as shown in FIG. 5, the control unit 70 receives the rolling schedule from the host controller 50 (S511).

In step S552, the control unit 70 determines whether the second downstream rolled material is the rolled material or the rolled material according to the rolling schedule input in step S511.

Then, if the rolled material determined in step S552 is the second subsequent normal rolled material, the controller 70 performs rolling through the roughing mill 20 and returns (S553).

After returning to the step S553, the process waits until the rolling of the preceding second succeeding control rolling material in the air cooling standby state in the shared cooling zone 200 is completed.

On the other hand, if it is determined in step S552 that the second following rolled material is the second following controlled rolled material, the controller 70 performs the primary rolling through the roughing mill 20 or the finishing mill 30 (S554).

That is, as shown in FIG. 6 (B), while the control rolled materials (# 1, # 2) are waiting for air cooling in the output cooling area 100 and the shared cooling area 200, 2 forward rolling of rolled material (# 3) can be performed.

After performing the primary rolling on the second following control rolled material in step S554, the controller 70 transfers the second following control rolling agent to the inlet cooling area 300 on the inlet side of the roughing mill 20, (S555).

Thereafter, the controller 70 determines whether the air-cooling time set in step S555 has elapsed (step S556).

If it is determined in step S556 that the air cooling time has not elapsed, the process returns to step S555 to continue the air cooling. If the air cooling time has elapsed, the second posterior control rolled material is subjected to secondary rolling And returns (S557).

When the control rolled material and the general rolled material are sequentially rolled, the control rolled material or the rolled control rolled material is rolled for the air-cooling standby time of the control rolled material, and then the rolled rolled material is rolled out.

As described above, according to the plate rolling control method according to the embodiment of the present invention, when the control rolled material and the general rolled material are successively rolled, by adjusting the air cooling standby position of the control rolled material, So that the productivity can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of the present invention should be determined by the following claims.

10: heating furnace 20: rough rolling mill
30: finishing mill 40: accelerated cooler
50: upper control device 60:
70: control unit 80: roller table drive unit
100: output cooling area 200: shared cooling area
300: Inlet cooling area

Claims (5)

In a heavy plate rolling facility in which an inlet side cooling region, a rough rolling mill, a shared cooling region, a finishing rolling mill and an outlet cooling region are sequentially arranged rearward of a heating furnace, a control unit receives a rolling schedule from an upper control device, Performing primary rolling through a finishing mill;
The control unit performs primary rolling on the control rolled material, transfers the cooled rolled sheet to an outgoing cooling area on the side of the finishing rolling mill, and air-cools it; And
And performing a secondary rolling on the control rolled material through the finishing rolling mill when the air cooling time has elapsed in the outgoing cooling zone of the control unit.
2. The method of claim 1, wherein the step of air-cooling the cooling zone in the outlet cooling zone comprises: cooling the first and second trailing control rolls in a direction opposite to the rolling direction of the rolling mill, Performing a primary rolling through the roll; And
Further comprising the step of: after the control section performs primary rolling on the first trailing control rolling material, air cooling the rolling mill in a shared cooling region between the rough rolling mill and the finishing rolling mill.
3. The method of claim 2, wherein the step of air-cooling the common cooling zone comprises: cooling the second trailing control rolled material to a first rolling ; And
Wherein the control unit performs primary rolling on the second trailing control rolled material, and then air-cools the cold rolled steel sheet at the inlet cooling area on the side of the rough rolling mill.
3. The method of claim 2, wherein the step of air-cooling in the common cooling zone comprises: rolling the second following normal rolled material through the roughing mill if the second following rolled material is a normal rolled material according to the rolling schedule And a step of controlling the rolling of the plate.
The method according to claim 1, wherein the step of air-cooling the cooling zone in the exit cooling zone comprises: cooling the first roughing rolled rolled material to the roughing rolling mill, And performing rolling through the steel plate.
KR1020150134336A 2015-09-23 2015-09-23 Rolling control method of thick steel plate KR101685844B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100711414B1 (en) * 2005-12-26 2007-04-30 주식회사 포스코 Device for manufacturing bar on roughing stand in hot rolling process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100711414B1 (en) * 2005-12-26 2007-04-30 주식회사 포스코 Device for manufacturing bar on roughing stand in hot rolling process

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