KR20220105929A - Apparatus and Method for Manufacturing Electrical Steel Sheet having Grain-oriented Texture by Extreme Asymmetric Rolling - Google Patents

Abstract

The present invention relates to a grain-oriented electrical steel sheet manufacturing apparatus and, more specifically, to an apparatus for manufacturing an electrical steel sheet having a grain-oriented texture by extremely asymmetrical rolling. The apparatus includes: a bottom contact support mounted and fixed to a support frame; a sheet material fixing stage fastened to a plurality of pin holes formed in the bottom contact support by a plurality of coupling pins; a rolled sheet material fixed to the sheet material fixing stage; a rotating roll rotatably mounted on the rolled sheet material; and a plurality of rolling pins mounted to protrude from the circumferential surface of the rotating roll and forming shear deformation on the upper surface of the rolled sheet material.

Description

Apparatus and Method for Manufacturing Electrical Steel Sheet having Grain-oriented Texture by Extreme Asymmetric Rolling

The present invention relates to an apparatus and method for manufacturing a grain-oriented electrical steel sheet, and more particularly, to an apparatus and method for manufacturing an electrical steel sheet having a grain-oriented texture by extremely asymmetric rolling.

Grain-oriented electrical steel sheet is usually reheated at a temperature of 1100°C or higher and hot-rolled, followed by annealing at a temperature of 900 to 1100°C. Hot-rolled sheet annealed sheet is manufactured through primary cold rolling, primary recrystallization, secondary cold rolling, and secondary recrystallization processes.

The core orientation that determines the magnetic properties of grain-oriented electrical steel sheet is {110}<001> Goss texture, which is a soft magnetic material with excellent magnetic properties mainly used for transformers. Goss is formed in the 35° shear strain structure, and asymmetric rolling increases the shear strain structure by increasing the amount of pure shear strain on the sheet surface.

Although the conventional asymmetric rolling method is known to form more surface shear deformation structure than the conventional rolling method, when mechanically asymmetric rolling is performed by changing the rotation speed or direction of the two rolling rolls, there is a limit to the mechanical rolling method, and rolling A problem occurs in the product due to the roll camber phenomenon in which the ash is bent in the longitudinal direction.

Registered Patent Publication No. 10-1274503 Registered Patent Publication No. 10-1594393 Registered Patent Publication No. 10-1657467 Laid-open Patent Publication No. 10-2017-0074635

The present invention is a step before the process proceeds from the hot rolling line to the cold rolling line during the manufacturing process of grain-oriented electrical steel sheet. After secondary recrystallization, {110 }<001> An object of the present invention is to provide a grain-oriented electrical steel sheet manufacturing apparatus and manufacturing method for forming a texture having a Goss orientation.

A grain-oriented electrical steel sheet manufacturing apparatus of the present invention for achieving the above object is an apparatus for manufacturing an electrical steel sheet having a grain-oriented texture by extremely asymmetric rolling, comprising: a floor contact support mounted to and fixed to a support frame; a plate holder mounted by a plurality of coupling pins in a plurality of pinholes formed in the floor contact support; a hot-rolled sheet material fixed to the sheet material holder; a rotating roll rotatably mounted on the hot-rolled sheet material; and a plurality of rolling pins mounted to protrude from the circumferential surface of the rotating roll to form shear deformation on the upper surface of the hot-rolled sheet material.

It may further include a support roll fixed under the rotating roll to support the lower surface of the floor contact support.

The plate holder may be mounted by changing the position by a plurality of coupling pins to pinholes at predetermined positions among the plurality of pinholes of the floor contact support.

The plurality of rolling pins may include at least one of a hemispherical pin, a rectangular parallelepiped pin, and a wedge-shaped pin.

The hot-rolled sheet material may be a steel sheet containing 2.0 to 3.0% by weight of Si, and the remainder being Fe and other unavoidable impurities.

A method for manufacturing a grain-oriented electrical steel sheet according to the present invention comprises the steps of: preparing a hot-rolled sheet material by hot rolling a steel sheet; coupling the hot-rolled plate to a plate holder and mounting the plate holder to a predetermined position of the floor contact support by a plurality of coupling pins in a plurality of pinholes formed in the floor contact support; forming a shear deformation on an upper surface of the hot-rolled sheet material by rotating a rotating roll mounted so that a plurality of rolling pins protrude from a circumferential surface; and sequentially repeating the asymmetric rolling by rotating the rotating roll by moving the plate holder to which the hot-rolled plate is coupled from the bottom contact support.

In the step of preparing the hot-rolled sheet material, the steel sheet is heated at a temperature of 1100° C. or higher to be hot-rolled, and the hot-rolled sheet material may be annealed in a temperature range of 900 to 1100° C.

After repeating the asymmetric rolling step, the first cold rolling the asymmetrically rolled sheet material; First annealing the first cold-rolled sheet; Secondary cold rolling of the first annealed plate material; and secondary annealing of the secondary cold-rolled sheet material.

After the asymmetric rolling repeat step, the asymmetrically rolled hot-rolled sheet material is moved to a second grain-oriented electrical steel sheet manufacturing apparatus having a rotating roll disposed below the hot-rolled sheet material to form a shear deformation on the lower surface of the hot-rolled sheet material. may include more.

According to the above-described apparatus and method for manufacturing grain-oriented electrical steel sheet of the present invention, an extremely asymmetric rolling process is performed as a step before the process proceeds from the hot rolling line to the cold rolling line during the manufacturing process of grain-oriented electrical steel sheet, so that the surface of the grain-oriented electrical steel sheet is 35° By forming a large amount of shear-strained structure, a texture with {110}<001> Goss orientation can be formed after secondary recrystallization.

1 is a top view showing an apparatus for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention.
2 is a side view of the grain-oriented electrical steel sheet manufacturing apparatus of FIG. 1 .
3 is a front view of the grain-oriented electrical steel sheet manufacturing apparatus of FIG.
FIG. 4 is a partial cross-sectional view showing a cross-section A of FIG. 2 .
5 is a view showing the floor contact support.
6 is a view showing a hot-rolled sheet material (a) and a sheet material holder (b).
7 is a view showing a rotating roll.
8 is a view showing the B, C, D cross section of the rotating roll in FIG.
9 is a view showing a hemispherical pin (a), a rectangular parallelepiped pin (b), a wedge-shaped pin (c).

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present invention, terms such as 'comprise' or 'have' are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings.

1 is a top view showing a grain-oriented electrical steel sheet manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a side view of the grain-oriented electrical steel sheet manufacturing apparatus of FIG. 1, and FIG. 3 is a front view of the grain-oriented electrical steel sheet manufacturing apparatus of FIG. , and FIG. 4 is a partial cross-sectional view showing the cross-section A of FIG. 2 . In FIG. 3, the hot-rolled sheet material is omitted, and in FIG. 4, the hot-rolled sheet material is included, but the coupling pin is omitted.

The grain-oriented electrical steel sheet manufacturing apparatus 100 of the present invention is an apparatus for manufacturing an electrical steel sheet having a grain-oriented texture by extremely asymmetric rolling, and the floor contact support 120 is mounted and fixed to the support frame 110, the floor contact Plate holder 130 mounted to the plurality of pinholes 125 formed in the pedestal 120 by a plurality of coupling pins, the hot-rolled plate 140 fixed to the plate holder 130, the hot-rolled plate 140 is rotatable on top and a plurality of rolling pins 160 mounted to protrude from the circumferential surface of the rotating roll 150 and the rotating roll 150 to form shear deformation on the upper surface of the hot-rolled sheet material 140 .

1 and 2, the support frame 110 may be fixed to the ground as a base frame for supporting the entire device. The support frame 110 includes a plurality of vertical frame portions 112 installed vertically on the ground, a horizontal frame portion 113 horizontally coupled to the plurality of vertical frame portions 112, and a pair of vertical frame portions ( 112) and the horizontal frame portion 113 may include a bracket portion 115 for coupling to each other. In the plurality of vertical frame units 112 , vertical frame units 112 in the form of four pillars may be arranged at predetermined intervals. The pair of horizontal frame parts 113 may be formed of a rectangular flat plate. The vertical frame part 112 may be integrally formed by being welded to the bracket part 115 . The bracket part 115 may be fastened to the side of the vertical frame part 112 by a plurality of bolts. Reinforcing ribs may be vertically welded to each other between the horizontal frame part 113 and the bracket part 115 .

The floor contact support 120 has a rectangular plate shape as a whole, and may be fastened to the support frame 110 by a plurality of bolts and mounted thereon. As shown in FIG. 5 , the floor contact support 120 has a rectangular plate-shaped main body 121 and a guide groove formed concavely on the upper surface of the main body 121 to guide the movement of the plate holder 130 . 122, a plurality of fastening holes 124 formed at both ends in the longitudinal direction of the main body 121, and a plurality of pinholes 125 formed through the guide groove 122 and arranged at predetermined intervals. can The guide groove 122 may be concavely formed on the upper surface of the main body 121 in the width direction to have a depth of about half of the thickness of the plate holder 130 over the entire longitudinal direction. A plurality of fastening holes 124 may be formed in a total of four each at both ends in the longitudinal direction of the body portion 121, and a screw thread is formed on the inner circumferential surface of each fastening hole 124 to form a horizontal frame portion of the support frame 110 ( 113) can be fastened by bolts. The plurality of pinholes 125 are formed through the guide groove 122 of the main body 121 and are arranged at predetermined intervals, so that the plate material holder 130 can be fixed by moving its position by the plurality of pins. The plurality of pinholes 125 may be arranged in four rows, and the pinholes 125 in the first and fourth rows may be alternately disposed with the pinholes 125 in the second and third rows.

The plate material holder 130 is coupled to the plurality of pinholes 125 formed in the floor contact support 120 by a plurality of coupling pins, and can be mounted by changing positions easily. As shown in Fig. 6(b), the plate holder 130 has a body portion 131 in the form of a rectangular plate, a plurality of pinholes 132 formed through both ends of the body portion 131, and a plurality of pinholes ( A plurality of fastening holes 134 formed inside the 132 may be included. A total of eight pinholes 132 may be formed at both ends of the main body 131, four each. The four pinholes 132 are formed in a line, and by aligning the positions with the two pinholes 125 among the pinholes 125 of the 4 rows of the floor contact support 120 and inserting the coupling pins, respectively, the plate holder 130 is It can be mounted by changing the position on the floor contact support (120). For example, a plurality of pinholes 132 of the floor contact support 120 are arranged at intervals of 30 mm in the longitudinal direction in one row, but since the pinholes 132 of each row are alternately formed, the plate holder 130 is It can be mounted by moving 15mm to the floor contact support 120 .

The hot-rolled sheet material 140 may be mounted by being fastened to the sheet material holder 130 by a plurality of bolts (not shown). As shown in FIG. 6( a ), the hot-rolled sheet material 140 has a body portion 141 in the form of a rectangular plate smaller than the sheet material holder 130 , and a plurality of fastening holes 143 formed at both ends of the body portion 141 . ) may be included. The main body 141 may be formed to have a predetermined thickness and a width and a length smaller than that of the plate holder 130 . The plurality of fastening holes 143 may correspond to the plurality of fastening holes 134 of the plate holder 130 , and may be formed in two at both ends of the main body 141 . Since a thread is formed on the inner circumferential surface of each fastening hole 143 , the hot-rolled sheet material 140 may be fastened to and fixed to the sheet material holder 130 by a plurality of bolts.

In another embodiment, the hot-rolled sheet material 140 is not fastened with a plurality of bolts, but instead the hot-rolled sheet material 140 may be fixed to the sheet material holder 130 by a clamping mechanism provided in the sheet material holder 130 . In this case, since a plurality of fastening holes 143 are not formed in the grain-oriented electrical steel sheet produced, there may be no need for additional work of cutting through-holes in the grain-oriented electrical steel sheet product.

The rotating roll 150 may be rotatably mounted on the hot-rolled sheet material 140 and the sheet material holder 130 by an electric motor or a hydraulic motor. As shown in FIG. 7 , the rotating roll 150 has a rotating shaft 151 having one end connected to the motor driving unit and the other end rotatably installed in a bearing, coupled to the rotating shaft 151 and together with the rotating shaft 151 . It may include a roll 155 which is rotated and installed so that the circumferential surface is spaced apart from the surface of the hot-rolled sheet material 140 by a predetermined distance. A plurality of pinholes for inserting and mounting a plurality of rolling pins 160 may be formed on a circumferential surface of the roll 155 . 7 and 8, the plurality of pinholes are a first pinhole 157 to which a hemispherical pin 161 is mounted, a second pinhole 158 to which a rectangular parallelepiped pin 162 is mounted, and a wedge-shaped pin 163. It may include a third pinhole 159 to which this is mounted. The first pinhole 157 , the second pinhole 158 , and the third pinhole 159 are all formed in a cylindrical hole shape, and the first pinhole 157 is larger than the second pinhole 158 and the third pinhole 159 . It may be formed to have a small diameter. The second pinhole 158 and the third pinhole 159 may have the same diameter.

The plurality of rolling pins 160 may be mounted to protrude from the circumferential surface of the rotating roll 150 and rotated to form shear deformation on the upper surface of the hot-rolled sheet material 140 . As shown in FIG. 4 , the plurality of rolling pins 160 may include one or more of a hemispherical pin 161 , a rectangular parallelepiped pin 162 , and a wedge-shaped pin 163 . The ends of the plurality of rolling pins 160 are disposed to interfere with the surface of the hot-rolled sheet material 140 , and as the rotating roll 150 is rotated, the plurality of rolling pins 160 are shear-deformed on the surface of the hot-rolled sheet material 140 . can form.

As shown in FIG. 9 , the hemispherical pin 161 may have a hemispherical end at its end. The rectangular parallelepiped pin 162 may have an end in the form of a rectangular prism. The wedge-shaped pin 163 may be formed in a wedge shape whose end is elongated in the axial direction of the rotation shaft 151 . In one embodiment, the plurality of rolling pins 160 may have three rolling pins 160 mounted on the rotating roll 150 . The three rolling pins 160 may consist of only one of a hemispherical pin 161, a rectangular parallelepiped pin 162, and a wedge-shaped pin 163, or may consist of two or three.

On the other hand, as shown in FIGS. 2 and 3 , it may further include a support roll 170 fixed under the rotary roll 150 to support the lower surface of the floor contact support 120 . The support roll 170 may be arranged to support the lower surface of the floor contact support 120 under the rotating roll 150 . Unlike the rotating roll 150, the support roll 170 is not rotated and supports the lower surface of the bottom contact support 120, so that the hot-rolled sheet material 140 is asymmetrically rolled by a plurality of rolling pins 160. can support

And, the grain-oriented electrical steel sheet manufacturing apparatus 100 of the present invention forms shear deformations by asymmetric rolling on the upper surface of the hot-rolled sheet material 140, next to the grain-oriented electrical steel sheet manufacturing apparatus 100 of the hot-rolled sheet material 140 A second grain-oriented electrical steel sheet manufacturing apparatus for asymmetric rolling to form shear deformations on the lower surface may be further installed. In the second grain-oriented electrical steel sheet manufacturing apparatus, a rotary roll equipped with a plurality of rolling pins is disposed at a lower portion and a support roll may be disposed at an upper portion. In this case, the hot-rolled sheet material 140 is vertically inverted to be coupled to the sheet material holder 130 , and may be mounted on the floor contact support such that the lower surface of the hot-rolled sheet material 140 faces downward. In the second grain-oriented electrical steel sheet manufacturing apparatus, a guide groove is formed on the lower surface of the bottom contact support, and the plate holder 130 may be coupled to the guide groove by a plurality of bolts. In this way, by installing and using two sets of grain-oriented electrical steel sheet manufacturing apparatus, the upper and lower surfaces of the hot-rolled sheet material can be sequentially asymmetrically rolled.

The hot-rolled sheet material 140, which is asymmetrically rolled by forming shear strain by the grain-oriented electrical steel sheet manufacturing apparatus 100 of the present invention, contains 2.0 to 3.0% by weight of Si (silicon), and the remainder Fe (iron) and other unavoidable impurities. It may be made of a steel plate. Silicon (Si) serves to increase the resistivity of the electrical steel sheet and reduce the magnetic anisotropy to lower the iron loss. When the content is less than 2.0% by weight, iron loss is inferior due to the small effect of increasing specific resistance and reducing magnetic anisotropy, and when the content is more than 3.0% by weight, brittleness increases and cold rolling becomes difficult. desirable.

Hereinafter, a method for manufacturing a grain-oriented electrical steel sheet of the present invention will be described.

The grain-oriented electrical steel sheet manufacturing method of the present invention includes the steps of preparing a hot-rolled sheet material 140 by hot rolling a steel sheet, combining the hot-rolled sheet material 140 with a sheet material holder 130 and attaching the sheet material holder 130 to the floor contact support 120 . ) of a plurality of pinholes 125 formed in the step of mounting at a predetermined position of the floor contact support 120 by a plurality of coupling pins, a plurality of rolling pins 160 mounted so as to protrude from the circumferential surface of the rotating roll 150 forming shear deformation on the upper surface of the hot-rolled sheet material 140 by rotating the and sequentially repeating the asymmetric rolling.

The present invention provides an excellent grain-oriented electrical steel sheet processing method having a texture having a {110} <001> Goss orientation by controlling the texture of the rolled steel. It is known that, by the extremely asymmetric rolling of the present invention, a seed growing in the {110}<001> Goss direction from shear deformations in the hot-rolled steel sheet is formed in a shear band forming 35° from the rolling direction. . The shear-modified tissue formed in the present invention includes such a shear band. Specifically, in an embodiment of the present invention, {110}<001> Goss texture may be defined as a texture having an orientation within 15° from the {110}<001> orientation.

First, by hot-rolling a steel sheet containing 2.0 to 3.0% by weight of Si, the remainder Fe and other unavoidable impurities at a temperature of 1100 ° C. or higher, and annealing the hot-rolled sheet in a temperature range of 900 to 1100 ° C., the hot-rolled sheet material 140 ) can be prepared.

Next, the hot-rolled plate material 140 may be coupled to the plate holder 130 , and the plate holder 130 may be mounted at a predetermined position of the floor contact support 120 . At this time, the hot-rolled sheet material 140 may be fastened to the sheet material holder 130 by a plurality of bolts, and the sheet material holder 130 is connected to a plurality of coupling pins in a plurality of pinholes 125 formed in the floor contact support 120 . It may be coupled to the floor contact support 120 by the.

Next, the hot-rolled sheet material 140 is asymmetrically rolled by rotating the rotary roll 150 once at a predetermined rpm. At this time, a plurality of rolling pins 160 mounted to protrude from the circumferential surface of the rotating roll 150 form shear deformations on the upper surface of the hot-rolled sheet material 140, so that the seed growing in the {110}<001> Goss direction ( seeds) can be formed.

Next, separating the coupling pins that fixed the plate holder 130 to the floor contact support 120, and moving the plate holder 130 from the floor contact support 120 a predetermined distance (eg, 15 mm) to the side After fixing the position again by the coupling pins, the rotation roll 150 is rotated once as above to perform asymmetric rolling. It is possible to sequentially repeat the process of moving the plate holder 130 again and asymmetric rolling. Then, shear deformations, that is, seeds growing in the {110}<001> Goss direction may be formed over the entire upper surface of the hot-rolled sheet material 140 .

On the other hand, after the asymmetric rolling repeating step, the hot-rolled sheet material 140 whose upper surface is asymmetrically rolled is moved to a second grain-oriented electrical steel sheet manufacturing apparatus having a rotary roll disposed below the hot-rolled sheet material to shear deformation on the lower surface of the hot-rolled sheet material. It may further include the step of forming a.

In the present invention, it is preferable not only to asymmetrically roll the upper surface of the hot-rolled sheet material, but also to perform asymmetric rolling on the lower surface of the hot-rolled sheet material. When there is only one grain-oriented electrical steel sheet manufacturing apparatus 100, the hot-rolled sheet material 140 is separated from the sheet material holder 130, and the hot-rolled sheet material 140 is vertically inverted so that the lower surface is up and fastened to the sheet material holder 130 again. . Subsequently, the plate holder 130 is mounted at a predetermined position of the floor contact support 120 by a plurality of coupling pins and asymmetrically rolled, and then the plate holder 130 is moved by 15 mm and then asymmetric rolling can be repeated.

When there are two sets of grain-oriented electrical steel sheet manufacturing apparatus, the top surface of the hot-rolled sheet material 140 is asymmetrically rolled in the first grain-oriented electrical steel sheet manufacturing apparatus 100, and the hot-rolled sheet material 140 in the second grain-oriented electrical steel sheet manufacturing apparatus immediately ) can be rolled asymmetrically. As described above, the hot-rolled sheet material 140 is mounted to the second grain-oriented electrical steel sheet manufacturing apparatus in which the rotary roll is disposed on the lower side so that the lower surface faces downward, and the asymmetric rolling can be performed while moving the mounting position.

The grain-oriented electrical steel sheet manufacturing method of the present invention, after the repeating asymmetric rolling step, the step of primary cold rolling the asymmetric rolled sheet material, the step of primary annealing the primary cold-rolled sheet material, the secondary cold the primary annealed sheet material It may further include the step of rolling, and secondary annealing of the secondary cold-rolled sheet material.

According to the present invention, it is possible to form a large amount of 35° shear strain structure on the surface of the hot-rolled steel sheet by asymmetric rolling. Then, when the cold rolling and annealing processes are carried out twice, the {110}<001> Goss seeds are preserved even after cold rolling in the shear strain structure formed on the surface, and the steel sheet obtained after the recrystallization annealing process is manufactured by a conventional process It can have much more {110}<001> Goss texture than grain-oriented electrical steel sheet.

In the above, an embodiment of the present invention has been described, but those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. The present invention may be variously modified and changed by the present invention, and this will also be included within the scope of the present invention.

100: electrical steel sheet manufacturing device
110: support frame 112: vertical frame portion
113: horizontal frame portion 115: bracket portion
120: floor contact support 121: body part
122: guide groove 124: fastener
125: pinhole
130: plate holder 131: body portion
132: pinhole 134: fastener
140: hot-rolled sheet material 141: body portion
143: fastening hole 145: shear deformation
150: rotating roll 151: rotating shaft
155: roll 157: first pinhole
158: second pinhole 159: third pinhole
160: rolling pin 161: hemispherical pin
162: rectangular parallelepiped pin 163: wedge pin
170: support roll

Claims (9)

In the apparatus for manufacturing an electrical steel sheet having a grain-oriented texture by extremely asymmetric rolling,
a floor contact pedestal that is mounted and fixed to the support frame;
a plate holder mounted by a plurality of coupling pins in a plurality of pinholes formed in the floor contact support;
a hot-rolled sheet material fixed to the sheet material holder;
a rotating roll rotatably mounted on the hot-rolled sheet material; and
A grain-oriented electrical steel sheet manufacturing apparatus including a plurality of rolling pins mounted to protrude from the circumferential surface of the rotating roll to form shear deformation on the upper surface of the hot-rolled sheet material. The method of claim 1,
Grain-oriented electrical steel sheet manufacturing apparatus, characterized in that it further comprises a support roll fixed under the rotating roll to support the lower surface of the bottom contact support. According to claim 1,
The plate material holder is a grain-oriented electrical steel sheet manufacturing apparatus, characterized in that the mounting by changing the position by a plurality of coupling pins to pinholes at predetermined positions among the plurality of pinholes of the bottom contact support. According to claim 1,
The plurality of rolled pins are grain-oriented electrical steel sheet manufacturing apparatus, characterized in that it comprises at least one of a hemispherical pin, a rectangular parallelepiped pin, a wedge-shaped pin. According to claim 1,
The hot-rolled sheet material is a grain-oriented electrical steel sheet manufacturing apparatus, characterized in that the steel sheet containing 2.0 to 3.0% by weight of Si, the remainder Fe and other unavoidable impurities. preparing a hot-rolled sheet material by hot-rolling the steel sheet;
coupling the hot-rolled plate to a plate holder and mounting the plate holder to a predetermined position of the floor contact support by a plurality of coupling pins in a plurality of pinholes formed in the floor contact support;
forming a shear deformation on an upper surface of the hot-rolled sheet material by rotating a rotating roll mounted so that a plurality of rolling pins protrude from a circumferential surface; and
A method for manufacturing a grain-oriented electrical steel sheet comprising the step of sequentially repeating asymmetric rolling by moving the plate holder to which the hot-rolled plate is coupled from the bottom contact support and rotating the rotating roll. 7. The method of claim 6,
The step of preparing the hot-rolled sheet material is a grain-oriented electrical steel sheet manufacturing method, characterized in that the hot-rolled by heating the steel sheet at a temperature of 1100 ℃ or higher, and annealing the hot-rolled sheet at a temperature range of 900 ~ 1100 ℃. 8. The method of claim 7,
After the asymmetric rolling repeat step,
First cold-rolling the asymmetrically rolled sheet material;
First annealing the first cold-rolled sheet;
Secondary cold rolling of the first annealed plate material; and
Grain-oriented electrical steel sheet manufacturing method, characterized in that it further comprises the step of secondary annealing the secondary cold-rolled sheet material. 8. The method of claim 7,
After the asymmetric rolling repeat step,
Moving the asymmetrically rolled hot-rolled sheet material to a second grain-oriented electrical steel sheet manufacturing apparatus having a rotating roll disposed below the hot-rolled sheet material to form a shear deformation on the lower surface of the hot-rolled sheet material, characterized in that it further comprises Grain-oriented electrical steel sheet manufacturing method.

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