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KR-20260062694-A - ASYMMETRICAL ROLLING DEVICE AND METHOD FOR MANUFACTURING STEEL PLATES

KR20260062694AKR 20260062694 AKR20260062694 AKR 20260062694AKR-20260062694-A

Abstract

The present invention discloses an asymmetric rolling apparatus comprising: a first roll positioned to contact a first surface of a workpiece to be rolled; and a second roll positioned to contact a second surface of the workpiece to be rolled; wherein the rotational angular velocity, diameter, and rotational linear velocity of the first roll and the second roll are different. According to the present invention, curvature can be improved, and it is economical as no separate additional device is required to improve the curvature phenomenon, and strength, ductility, uniformity, electromagnetic properties, and anisotropy can be improved due to shear deformation equivalent to that of two-speed rolling.

Inventors

  • 한상욱
  • 선정안
  • 윤동근

Assignees

  • 현대제철 주식회사

Dates

Publication Date
20260507
Application Date
20241029

Claims (10)

  1. A first roll positioned to be in contact with the first surface of the rolled material; and It includes a second roll positioned to be in contact with the second surface of the above-mentioned rolled material; and An asymmetric rolling device characterized by the fact that the rotational angular velocity, diameter, and rotational linear velocity of the first roll and the second roll are different.
  2. In paragraph 1, An asymmetric rolling device in which the ratio of the rotational angular velocity of the larger diameter roll and the smaller diameter roll among the first roll and the second roll is greater than 1:1 and less than or equal to 1:4.
  3. In paragraph 1, An asymmetric rolling device in which the ratio of the rotational linear velocity of the roll with a larger diameter and the roll with a smaller diameter among the first roll and the second roll is greater than 1:1 and less than or equal to 1:2.
  4. In paragraph 1, The above-mentioned asymmetric rolling device is characterized by being used in a cold rolling process, Asymmetric rolling device.
  5. An asymmetric rolling method using an asymmetric rolling device according to any one of claims 1 to 4, wherein the method is Characterized by rolling the material to be rolled while moving it between the first roll and the second roll, Asymmetric rolling method.
  6. In paragraph 5, The first roll is located at the top, and the second roll is located at the bottom, and An asymmetric rolling method satisfying the following Equation 1 when the diameter of the first roll < the diameter of the second roll: [Equation 1] 1 < A/B ≤ 2 (In the above Equation 1, The linear velocity of the first roll is A, and the linear velocity of the second roll is B.
  7. A step of rolling while moving the material to be rolled between the first roll and the second roll; and A method for manufacturing a steel plate comprising the step of annealing the above-mentioned rolled material; The first roll and the second roll are in contact with the rolled material, The rotational angular velocity, diameter, and rotational linear velocity of the first and second rolls are different. Method for manufacturing steel plates.
  8. In Paragraph 7, A method for manufacturing a steel plate, wherein the ratio of the rotational angular velocity of the roll with a larger diameter and the roll with a smaller diameter among the first roll and the second roll is greater than 1:1 and less than or equal to 1:4.
  9. In Paragraph 7, A method for manufacturing a steel plate, wherein the ratio of the rotational linear speeds of the roll with a larger diameter and the roll with a smaller diameter among the first roll and the second roll is greater than 1:1 and less than or equal to 1:2.
  10. In Paragraph 7, A method for manufacturing a steel plate, further comprising a step of surface treating the above-mentioned rolled material after the step of annealing.

Description

Asymmetric Rolling Device and Method for Manufacturing Steel Plates The present invention relates to an asymmetric rolling apparatus and a method for manufacturing a steel plate. More specifically, the present invention relates to an asymmetric rolling apparatus and a method for manufacturing a steel plate that can improve curvature, is economical, and can improve strength, ductility, uniformity, electromagnetic properties, and anisotropy. Asymmetric rolling is a rolling process in which the diameters or rotational speeds of the upper and lower rolls are different. Unlike conventional symmetric rolling, which applies only compressive deformation, this asymmetric rolling method is important in the manufacturing process of next-generation materials because it can introduce new forms of deformation. In particular, compared to symmetric rolling, the asymmetric rolling method can introduce shear deformation, which is typically applied only to the surface of the material, into the entire material, thereby creating a new shear texture and improving formability. Representative asymmetric rolling methods include two-speed rolling and shape rolling, which can impart shear deformation to the material; however, there is a problem in that the strip bends due to differences in rotational speed or upper and lower contact surfaces. In addition, if a continuous asymmetric rolling process is performed, bending accumulates, causing significant curvature and reducing the flatness of the strip, which can lead to the collapse of the coil during the coiling process. Therefore, an asymmetric rolling method is required that can significantly improve curvature while maintaining the formation of a shear-linked structure. Related prior art is Chinese Patent Publication No. 112845616. FIG. 1 shows an asymmetric rolling apparatus according to one embodiment of the present invention. Figure 2 shows the deformation heights of Example 1 and Comparative Examples 1 and 2 of the present invention. FIG. 3 shows the deformation heights of embodiments 1 to 3 of the present invention. Figure 4 shows the shear strain of the upper surface, center, and lower surface of Example 1 and Comparative Examples 1 and 2 of the present invention. FIG. 5 shows the shear strain of the upper surface, center, and lower surface of embodiments 1 to 3 of the present invention. The present invention will be described in more detail below with reference to the attached drawings. However, the following drawings are provided merely to aid in understanding the present invention, and the present invention is not limited by the drawings. Furthermore, the shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings are exemplary, and the present invention is not limited to the depicted details. Throughout the specification, the same reference numerals refer to the same components. Additionally, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Where terms such as 'includes,' 'have,' and 'consists of' are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it is in the plural unless specifically stated otherwise. In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement. When the positional relationship between two parts is described using expressions such as 'on', 'on the upper', 'on the lower', or 'next to', one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used. Positional relationships such as 'upper,' 'upper surface,' 'lower,' and 'lower surface' are described based solely on the drawing and do not represent absolute positional relationships. In other words, depending on the observation location, the positions of 'upper' and 'lower,' or 'upper surface' and 'lower surface,' may be interchanged. Hereinafter, the asymmetric rolling apparatus and the method for manufacturing a steel plate according to the present invention will be described in detail with reference to the drawings. One aspect of the present invention relates to an asymmetric rolling device. FIG. 1 shows an asymmetric rolling apparatus according to one embodiment of the present invention. Referring to FIG. 1, the asymmetric rolling device (100) comprises a first roll (20) positioned to be in contact with a first surface (11) of a workpiece (10); and a second roll (30) positioned to be in contact with a second surface (12) of the workpiece (10), wherein the rotational angular velocity ( W1 , W2 ), diameter ( R1 , R2 ), and rotational linear velocity ( V1 , V2 ) of the first roll (20) and the second roll (30) are different. The above-mentioned rolled material (10) may be a strip used as an intermediate material before being processed