KR20110097523A - Apparatus for rolling steel plate using magnetic force - Google Patents

Apparatus for rolling steel plate using magnetic force Download PDF

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Publication number
KR20110097523A
KR20110097523A KR1020100017405A KR20100017405A KR20110097523A KR 20110097523 A KR20110097523 A KR 20110097523A KR 1020100017405 A KR1020100017405 A KR 1020100017405A KR 20100017405 A KR20100017405 A KR 20100017405A KR 20110097523 A KR20110097523 A KR 20110097523A
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KR
South Korea
Prior art keywords
rolling
hydraulic
magnetic force
rolling roll
electromagnet
Prior art date
Application number
KR1020100017405A
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Korean (ko)
Inventor
고강희
이현규
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현대제철 주식회사
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Priority to KR1020100017405A priority Critical patent/KR20110097523A/en
Publication of KR20110097523A publication Critical patent/KR20110097523A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force

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

Abstract

Steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention is a rolling roll stand for supporting the rolling rolls respectively disposed on the top and bottom; An electromagnet installed on the rolling roll stand to generate a magnetic force; A power supply device which supplies electric power to the electromagnet so that the slab or hot rolled coil is rolled by the rolling roll by the magnetic force; And a switch for switching a power supply of the power supply device.

Description

Steel plate rolling device using magnetic force {APPARATUS FOR ROLLING STEEL PLATE USING MAGNETIC FORCE}

Embodiments of the present invention relate to an apparatus for rolling a steel sheet using a magnetic force.

In general, the rolling process includes a heating step of heating the rolled material to a predetermined temperature, a rough rolling step of rolling the material discharged from the heating step in a width direction, a finishing rolling step of rolling the rough rolled material to a target thickness, and the It proceeds to the cooling process which cools the final rolled material by a finishing rolling process, and the winding process which winds a cooled rolled strip with a coil.

That is, in the rolling process, the rolled material is sandwiched between two rotating rolling rolls of a roll stand to form a thin and long shape. The rolling stand forms the final rolled product through plastic deformation of the material while passing the material between rolling rolls rotating at room temperature or high temperature.

In the rolling process, in order to mold a product of a desired shape in a short process line, a product is formed by rolling a material several times in one rolling stand. Here, a side guide is provided in the front-back position of the said rolling stand, and the position of the raw material inserted into the said rolling stand is adjusted.

One embodiment of the present invention provides a steel sheet rolling apparatus using a magnetic force to generate a strong attraction between the upper and lower portions of the rolling roll through the magnetic force during rolling of the steel sheet by installing an electromagnet on the rolling stand.

One embodiment of the present invention provides a steel sheet rolling apparatus using a magnetic force to be able to roll the steel sheet with a stronger reduction force by using a magnetic force in addition to the hydraulic pressure when rolling the steel sheet.

The problem to be solved by the present invention is not limited to the problem (s) mentioned above, and other object (s) not mentioned will be clearly understood by those skilled in the art from the following description.

Steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention is a rolling roll stand for supporting the rolling rolls respectively disposed on the top and bottom; An electromagnet installed on the rolling roll stand to generate a magnetic force; A power supply device which supplies electric power to the electromagnet so that the slab or hot rolled coil is rolled by the rolling roll by the magnetic force; And a switch for switching a power supply of the power supply device.

Steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention is a rolling roll stand for supporting the rolling rolls respectively disposed on the upper and lower sides; An electromagnet installed on the rolling roll stand to generate a magnetic force; A power supply device which supplies electric power to the electromagnet so that the slab or hot rolled coil is rolled by the rolling roll by the magnetic force; A hydraulic device for transmitting power to the rolling roll by using a hydraulic pressure so that the slab or the hot rolled coil is rolled by the rolling roll; And a switch for turning on or off the operation of the power supply and the hydraulic device.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and / or features of the present invention and methods for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

According to an embodiment of the present invention, by installing an electromagnet on the rolling stand can be a strong attraction between the top and bottom of the rolling roll through a magnetic force during rolling of the steel sheet.

According to an embodiment of the present invention, the steel sheet can be rolled with a stronger pressing force by using magnetic force in addition to hydraulic pressure when rolling the steel sheet.

According to an embodiment of the present invention, by adding a magnetic force in the situation that it is difficult to apply pressure only by the hydraulic pressure during the rolling process, it is possible to roll more strongly, even if the steel sheet of high strength can be more wider range, even thinner Steel sheet can be produced.

1 is a schematic view schematically showing a general steel sheet rolling apparatus.
2 is a conceptual diagram of a steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention.
3 is a view illustrating a steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention.
4 is a conceptual diagram of a steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention.
5 is a view illustrating a steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention.

1 is a schematic view schematically showing a general steel sheet rolling apparatus.

As shown in Figure 1, the general steel sheet rolling apparatus 100 is applied to the slab (Slab) or hot rolled coil (Hot Coil) to apply the pressure to match the thickness of the final product is rolled through 5 to 6 rolling roll stand.

However, such a steel sheet rolling apparatus 100 presses the hydraulic pressure only when a high strength steel grade or a very thin final product is to be made, which requires too much load on the hydraulic motor or requires more rolling roll stands. .

That is, the steel sheet rolling device 100 is to roll the slab or hot rolled coil by using hydraulic pressure, in which case there is a limit to thinning the thickness of the final rolled product when the thickness of the slab is thick or the thickness of the hot rolled coil is thick.

In particular, the steel sheet rolling apparatus 100, for example, when the tensile strength is high strength, such as 980MPa (Mega Pascal), even when rolling to the same thickness than other steel grades, more rolling force is required, There is a limit to rolling only by hydraulic pressure.

In addition, in the case of automotive steel sheet requires a thinner steel sheet, in the case of a thin steel sheet requires more force, there is a limit to rolling only by hydraulic pressure.

Therefore, in the embodiments of the present invention by adding a magnetic force in the situation that it is difficult to apply pressure only by the hydraulic pressure during the rolling process, it is possible to roll more strongly, even if the steel grade of high strength can be widened the range that can be rolled, thinner Steel sheet can be produced.

That is, in the embodiments of the present invention, by increasing the reduction force during rolling by using hydraulic pressure and magnetic force, it is possible not only to expand the range of the rollable steel sheet but also to provide an environment for manufacturing thinner steel sheets.

On the other hand, in the embodiments of the present invention it is possible to use only the magnetic force without using the hydraulic pressure during the rolling process. That is, in the embodiments of the present invention, unlike the hydraulic type using the conventional hydraulic device, the rolling process may be performed by operating the rolling roll electronically using an electromagnet.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

2 is a conceptual diagram of a steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention.

As shown in Figure 2, the steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention to supply a power to the electromagnet during the rolling process of the steel sheet (slab or hot rolled coil) so that a strong attraction force between the electromagnets.

Accordingly, pressure is applied to the rolling roll for rolling the steel sheet, and the rolling rolls are pressed in a direction facing each other to roll the steel sheet.

As such, the steel sheet rolling apparatus using the magnetic force according to an embodiment of the present invention may perform the rolling process for the steel sheet by driving the rolling roll electronically using the magnetic force of the electromagnet.

3 is a view illustrating a steel sheet rolling apparatus using a magnetic force according to an embodiment of the present invention.

Referring to FIG. 3, the steel sheet rolling apparatus 300 using a magnetic force according to an embodiment of the present invention may include a rolling roll stand 310, an electromagnet 320, and a control box 330. have.

The rolling roll stand 310 serves to support the rolling rolls 340 disposed on the upper and lower sides, respectively. That is, the rolling roll stand 310 is installed one by one on both sides of the rolling roll 340 disposed on the upper side, one on both sides of the rolling roll 340 disposed on the lower side.

When the rolling roll stand 310 is defined as a set that is installed on both sides of the upper and lower rolling rolls 340 as described above, the set of rolling roll stand 310 is the thickness of the final rolled product, One or more may be configured in consideration of the rigidity and the like.

The rolling roll 340 may include a pair of work rolls and a pair of back-up rolls, and an intermediate roll between the work rolls and the reinforcement rolls. It may further include.

In addition, the rolling roll 340 serves to roll the steel sheet of the slab (Slab) or hot rolled coil (Hot Coil) state to the final product. That is, the rolling roll 340 is passed through the slab or hot rolled coil between the upper rolling roll 340 and the lower rolling roll 340, to apply a pressure to match the thickness of the final product to make a rolled final product do.

To this end, in one embodiment of the present invention by using an electromagnet 320 for generating a magnetic force to transfer power to the rolling roll 340, it is possible to perform a step of rolling the steel sheet of the slab or hot rolled coil.

The electromagnet 320 is formed of a coil wound around a cylindrical iron core. The electromagnet 320 is a magnetic field is formed by passing a current through a coil wound in a cylindrical shape, a stronger magnetic field can be obtained by putting an iron core therein. An example of the electromagnet 320 is a solenoid or the like.

The electromagnet 320 may be installed on the rolling roll stand 310 supporting the rolling roll 340. That is, the electromagnet 320 may be installed one by one on the rolling roll stand 310 disposed on the upper left and right sides, respectively, one on the rolling roll stand 310 disposed on the lower left and right sides.

The electromagnet 320 receives magnetic power from the power supply device in the control box 330 to generate a magnetic force. That is, when the electromagnet 320 receives power from the power supply device in the control box 330, a magnetic field is induced by a current flowing through a coil wound in a cylindrical shape, and generates a magnetic force due to the induced magnetic field. do.

In this case, the electromagnet 320 may generate the magnetic force differently according to the amount of power supplied from the power supply device in the control box 330. The power supply amount is adjustable by a switch (variable switch) in the control box 330.

The electromagnet 320 may use a strong attraction force between the upper and lower electromagnet 320 by using the generated magnetic force. As a result, the electromagnet 320 may apply pressure to the rolling roll 340 to roll the slab or the hot rolled coil.

In this case, the electromagnet 320 may be installed to face each other at the side of the rolling roll stand 310 may be a strong attraction force to each other by the magnetic force. In addition, the electromagnet 320 preferably maintains a proper size and a suitable separation distance to maximize the efficiency of the magnetic force.

The number or capacity of the electromagnet 320 may be appropriately selected in consideration of the number of the rolling roll stands 310, the thickness of the final rolled product, and the like.

The control box 330 may include a power supply device and a switch.

The power supply device may supply power to the electromagnet 320 so that the slab or the hot rolled coil is rolled by the rolling roll 340 by the magnetic force.

The power supply device may adjust the power supply amount to the electromagnet 320. Accordingly, the electromagnet 320 may generate the magnetic force differently. The power supply amount is adjustable by the switch (variable switch).

The switch switches the power of the power supply. That is, the switch functions to turn on or off the power of the power supply device. Accordingly, the power supply device can supply power to the electromagnet constantly.

Alternatively, the switch may be implemented as a variable switch for variably adjusting the power supply amount of the power supply device. Accordingly, the power supply device adjusts the attraction force acting on the electromagnet 320 by varying the power supply amount to the electromagnet 320 in consideration of the thickness of the final rolled product, etc. and eventually the rolling roll 340. The rolling force of can be controlled.

4 is a conceptual diagram of a steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention.

As shown in Figure 4, the steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention is to provide a strong attraction force between the electromagnet by supplying power to the electromagnet during the rolling process of the steel sheet (slab or hot rolled coil) At the same time, it is possible to apply pressure to the rolling rolls using a hydraulic apparatus.

Accordingly, since a stronger pressure is applied to the rolling roll for rolling the steel sheet, the steel sheet can be rolled more strongly by the rolling roll.

In particular, in the case of a steel sheet having a high tensile strength, for example, 980 MPa, even when rolling to the same thickness compared to other steel sheets, more rolling force is required, and the magnetic force according to another embodiment of the present invention According to the used steel plate rolling apparatus, since both hydraulic pressure and magnetic force are used, even in the case of a high strength steel sheet steel sheet, the rolling can be performed properly.

Thus, the steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention by using the magnetic force of the electromagnet and the hydraulic pressure of the hydraulic device to drive the rolling roll electronically and hydraulically, the rolling process for high strength steel sheet steel properly Can be done.

5 is a view illustrating a steel sheet rolling apparatus using a magnetic force according to another embodiment of the present invention.

Referring to FIG. 5, the steel sheet rolling apparatus 500 using the magnetic force according to another embodiment of the present invention includes a rolling roll stand 510, an electromagnet 520, a hydraulic apparatus 530, and a control box 540. can do.

The rolling roll stand 510 supports rolling rolls 550 disposed at upper and lower sides, respectively. That is, the rolling roll stand 510 is installed one by one on both sides of the rolling roll 550 disposed on the upper side, one on both sides of the rolling roll 550 disposed on the lower side.

When the rolling roll stand 510 is defined as a set that is installed on both sides of the upper and lower rolling rolls 550 as described above, the rolling roll stand 510 set is the thickness of the final rolled product, One or more may be configured in consideration of the rigidity and the like.

Here, the rolling roll 550 may include a pair of work rolls and a pair of reinforcement rolls, and may further include an intermediate roll between the work rolls and the reinforcement rolls.

In addition, the rolling roll 550 serves to roll the steel sheet of the slab or hot rolled coil state into a final product. That is, the rolling roll 550 passes the slab or the hot rolled coil between the upper rolling roll 550 and the lower rolling roll 550, while considering the thickness or rigidity of the final rolled product, the slab or the Pressure is applied to the hot rolled coil to make the final rolled product.

To this end, in another embodiment of the present invention, by using the electromagnet 520 and the hydraulic device 530, it is possible to perform a step of rolling the steel sheet of the slab or hot rolled coil. Hereinafter, the electromagnet 520 and the hydraulic device 530 will be described.

The electromagnet 520 is formed of a coil wound around a cylindrical iron core. The electromagnet 520 is a magnetic field is formed by passing a current through a coil wound in a cylindrical shape, a stronger magnetic field can be obtained by putting an iron core therein. An example of the electromagnet 520 is a solenoid or the like.

The electromagnet 520 may be installed on the rolling roll stand 510 supporting the rolling roll 550. That is, the electromagnets 520 may be installed one by one on the rolling roll stand 510 disposed on the upper left and right sides, and one each on the rolling roll stands 510 disposed on the lower left and right sides.

The electromagnet 520 receives the electric power from the power supply device in the control box 540 to generate a magnetic force. That is, when the electromagnet 520 receives power from the power supply device in the control box 540, a magnetic field is induced by a current flowing in a coil wound in a cylindrical shape, and generates a magnetic force due to the induced magnetic field. do.

In this case, the electromagnet 520 may generate the magnetic force differently according to the amount of power supplied from the power supply device in the control box 540. The power supply amount is adjustable by a switch (variable switch) in the control box 540.

The electromagnet 520 may apply a strong attraction force between the upper and lower electromagnets 520 by using the generated magnetic force. As a result, the electromagnet 520 may roll the slab or the hot rolled coil by applying pressure to the rolling roll 550.

At this time, the electromagnet 520 is installed to face each other on the side of the rolling roll stand 510 may be a strong attraction force to each other by the magnetic force. In addition, the electromagnet 520 preferably maintains a proper size and a suitable separation distance to maximize the efficiency of the magnetic force.

The number or capacity of the electromagnets 520 may be appropriately selected in consideration of the number of rolling roll stands 510, the thickness of the final rolled product, and the like.

Although not shown in the drawings, the hydraulic apparatus 530 may include a hydraulic pump, a hydraulic motor, a hydraulic cylinder, a hydraulic valve, a hydraulic controller, and the like.

The hydraulic pump serves to supply hydraulic pressure.

The hydraulic motor drives the hydraulic pump to supply hydraulic pressure from the hydraulic pump to the hydraulic cylinder.

The hydraulic cylinder operates by receiving the hydraulic pressure from the hydraulic pump, and transmits power to the rolling roll 550 so that the slab or the hot rolled coil is rolled by the rolling roll 550.

The hydraulic valve is installed between the hydraulic pump and the hydraulic cylinder to regulate the hydraulic pressure from the hydraulic pump. Thus, the hydraulic valve can control the rolling force of the rolling roll.

The hydraulic controller controls the hydraulic valve.

The control box 540 may include a power supply device and a switch.

The power supply device may supply power to the electromagnet 520 so that the slab or the hot rolled coil is rolled by the rolling roll 550 by the magnetic force.

The power supply device may adjust the power supply amount to the electromagnet 520. Accordingly, the electromagnet 520 may generate the magnetic force differently. The power supply amount is adjustable by the switch (variable switch).

The switch switches power to the power supply and the hydraulic device 530. That is, the switch functions to turn on or off power of the power supply device and the hydraulic device 530.

Accordingly, the power supply device generates a magnetic force on the electromagnet 520 to apply pressure to the rolling roll 550, and the hydraulic device drives the hydraulic cylinder through the hydraulic pressure to the rolling roll 550 Additional pressure can be applied.

Alternatively, the switch may be implemented as a variable switch for variably adjusting the power supply amount of the power supply device. Accordingly, the power supply device adjusts the attraction force acting on the electromagnet 520 by changing the power supply amount to the electromagnet 520 in consideration of the thickness of the final rolled product, etc. and eventually the rolling roll 550. The rolling force of can be controlled.

On the other hand, in the embodiment of the present invention, the load applied to each set of the rolling roll stand 510 is shown in Table 1 below. Table 1 shows an example load test when the rolling roll stand 510 is four sets.

Set 1 Set 2 Set 3 Set 4 Load (kgf / mm 2) 2081 1707 1170 618 1130 1158 844 422

As shown in Table 1, the rolled roll stand 510 set 1 has a load of 2081kgf / mm 2 , 1130kgf / mm 2 at the top and bottom, respectively, and the rolled roll stand 510 set 2 is 1707kgf / mm respectively at the top and bottom 2 , 1158kgf / mm 2 is applied. In addition, the rolling roll stand 510 set of three upper and lower are respectively 1170kgf / mm 2, it takes a load of 844kgf / mm 2, rolling roll stand 510 set of four upper and lower are respectively 618kgf / mm 2, 422kgf of It takes a load of / mm 2 .

As such, the steel sheet rolling apparatus using the magnetic force according to the embodiments of the present invention can be rolled more strongly by adding a magnetic force in a situation where it is difficult to apply pressure only by the hydraulic pressure during the rolling process, so that the steel sheet can be rolled even with high strength. The range can be widened and thinner steel sheets can be produced.

In addition, the steel sheet rolling apparatus using a magnetic force according to embodiments of the present invention may perform a rolling process for the steel sheet of the slab or hot rolled coil using only the magnetic force generated from the electromagnet.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

310, 510: rolling roll stand
320, 520: electromagnet
330, 540: control box
340, 550: rolling roll
530: hydraulic system

Claims (10)

A rolling roll stand for supporting rolling rolls disposed on upper and lower sides, respectively;
An electromagnet installed on the rolling roll stand to generate a magnetic force;
A power supply device which supplies electric power to the electromagnet so that the slab or hot rolled coil is rolled by the rolling roll by the magnetic force; And
A switch for switching the power of the power supply
Steel sheet rolling apparatus using a magnetic force comprising a.
The method of claim 1,
The electromagnet is
Steel plate rolling apparatus using a magnetic force is installed so as to face each other on the side of the rolling roll stand to enable a strong attraction force to each other by the magnetic force.
The method of claim 1,
The switch is
The blank holding device using a magnetic force, characterized in that the variable switch for controlling the rolling force of the rolling roll by varying the power supply amount of the power supply device.
The method of claim 1,
Hydraulic pump to supply hydraulic pressure;
A hydraulic motor for driving the hydraulic pump; And
The hydraulic cylinder is operated by receiving the hydraulic pressure from the hydraulic pump, and transmits power to the rolling roll so that the slab or the hot rolled coil is rolled by the rolling roll.
Blank holding apparatus using a magnetic force, characterized in that it further comprises.
The method of claim 4, wherein
A hydraulic valve installed between the hydraulic pump and the hydraulic cylinder so as to control the rolling force of the rolling roll to adjust the hydraulic pressure from the hydraulic pump; And
Hydraulic controller to control the hydraulic valve
Blank holding apparatus using a magnetic force, characterized in that it further comprises.
A rolling roll stand for supporting rolling rolls disposed on upper and lower sides, respectively;
An electromagnet installed on the rolling roll stand to generate a magnetic force;
A power supply device which supplies electric power to the electromagnet so that the slab or hot rolled coil is rolled by the rolling roll by the magnetic force;
A hydraulic device for transmitting power to the rolling roll by using a hydraulic pressure so that the slab or the hot rolled coil is rolled by the rolling roll; And
A switch for turning on or off the operation of the power supply and the hydraulic device
Steel sheet rolling apparatus using a magnetic force comprising a.
The method of claim 6,
The electromagnet is
Steel plate rolling apparatus using a magnetic force is installed so as to face each other on the side of the rolling roll stand to act a strong attraction force to each other by the magnetic force.
The method of claim 6,
The switch is
And a variable switch controlling a rolling force of the rolling roll by variably adjusting the power supply amount of the power supply device.
The method of claim 6,
The hydraulic device
A hydraulic pump for supplying the hydraulic pressure;
A hydraulic motor for driving the hydraulic pump; And
The hydraulic cylinder is operated by receiving the hydraulic pressure from the hydraulic pump, and transmits power to the rolling roll so that the slab or the hot rolled coil is rolled by the rolling roll.
Blank holding apparatus using a magnetic force comprising a.
10. The method of claim 9,
The hydraulic device
A hydraulic valve installed between the hydraulic pump and the hydraulic cylinder so as to control the rolling force of the rolling roll to adjust the hydraulic pressure from the hydraulic pump; And
Hydraulic controller to control the hydraulic valve
Blank holding apparatus using a magnetic force, characterized in that it further comprises.
KR1020100017405A 2010-02-25 2010-02-25 Apparatus for rolling steel plate using magnetic force KR20110097523A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101365517B1 (en) * 2011-11-16 2014-02-20 (주)포스코 Cold strip rolling mill with magnetic work roll and system that contains them
KR101490131B1 (en) * 2013-05-20 2015-02-05 주식회사 포스코 Apparatus for holding upper roll of leveller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101365517B1 (en) * 2011-11-16 2014-02-20 (주)포스코 Cold strip rolling mill with magnetic work roll and system that contains them
KR101490131B1 (en) * 2013-05-20 2015-02-05 주식회사 포스코 Apparatus for holding upper roll of leveller

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