Plated steel sheet, and apparatus and method for manufacturing same

Abstract

An embodiment of the present invention provides a plated steel sheet comprising: a first plated steel sheet region extending in a first direction and including a first steel sheet region and a first plated region; and a second plated steel sheet region extending in the first direction and including a second steel sheet region and a second plated region, wherein the second plated steel sheet region includes: a first end portion that is continuous with the first plated steel sheet region; a second end portion formed in a direction opposite to the first end portion; a pressed portion pressed inwardly from the upper surface or the lower surface of the second plated region by a press depth in the second direction; and a cut portion disposed in the second end portion of the second plated steel sheet region and extending in the second direction, wherein the width of the second plated steel sheet region is greater than the press depth.

Description

Galvanized steel sheet, its manufacturing apparatus and manufacturing method

[0001] The present invention relates to a plated steel sheet, and a manufacturing apparatus and manufacturing method thereof.

[0002] When cutting galvanized steel sheets, straight blades are used, and technologies to prevent corrosion of the cut surface when cutting with such straight blades are being used, such as improved blades that allow the plating layer to be pushed down and deposited in small amounts on the cut surface when cutting the galvanized steel sheet, thereby slowing down corrosion of the cut surface, or technologies that position the upper and lower blades vertically on the steel sheet when cutting the galvanized steel sheet so that the plating layer can be pushed down to the cut surface. However, although these technologies can be utilized to improve the corrosion resistance of the cut surface of plate-shaped galvanized steel sheets, they have the limitation of not being easily applied to the cut surface of coil-shaped galvanized steel sheets. In addition, if the shape of the blade is changed from straight to circular and used to cut coil-shaped galvanized steel sheets, the lifespan is shortened compared to existing blades, and the cut surface is not clean and rough, which promotes corrosion.

[0003] Meanwhile, the sacrificial nature of the plating layer plays a key role in preventing corrosion at the cut surface of a plated steel sheet. Furthermore, the plating layer reacts with corrosive substances to produce corrosion products. These corrosion products flow down the cut surface of the plated steel sheet through water droplets or rainfall, accumulating in the corroded area and acting as a barrier to prevent corrosion.

[0004] The sacrificial and blocking properties of the cut surface by the plating layer improve with thinner and thicker plating layers, respectively. Improved corrosion resistance at the cut surface of the plating layer also extends the lifespan of the component. However, because the thickness of the plating sheet must be maintained to ensure rigidity depending on its intended use, it cannot be reduced below a certain level. Furthermore, the plating weight is limited by the plating sheet manufacturing process, making it difficult to achieve a plating weight exceeding a certain level.

[0005] The present invention was created to solve the above problems, and its purpose is to provide a plated steel sheet capable of suppressing rust generation at a cut surface by reducing the thickness of the plated steel sheet to minimize the area of ​​the steel sheet exposed through the cut surface, and a manufacturing apparatus and manufacturing method thereof.

[0006] In order to achieve the above object, a plated steel sheet according to one embodiment of the present invention includes a first plated steel sheet region extending in a first direction and including a first steel sheet region and a first plating region, and a second plated steel sheet region extending in the first direction and including a second steel sheet region and a second plating region, wherein the second plated steel sheet region includes a first end portion continuous with the first plated steel sheet region, a second end portion formed in an opposite direction to the first end portion, a pressing portion pressed inwardly along the second direction by a pressing depth on an upper or lower surface of the second plating region, and a cut portion disposed at the second end of the second plated steel sheet region and extending along the second direction, wherein a width of the second plated steel sheet region may be greater than the pressing depth.

[0007] In an embodiment of the present invention, the compression depth of the compression unit can be changed along the first direction.

[0008] In an embodiment of the present invention, the compression depth of the compression portion may increase from the first end of the second plated steel plate region toward the second end along the first direction.

[0009] In an embodiment of the present invention, the pressing portion may have a shape that is curved toward the inside of the second plated steel plate region.

[0010] In an embodiment of the present invention, the compression member may have a slope of a tangent line that can change along the first direction between the first end and the second end of the second plated steel plate region.

[0011] In an embodiment of the present invention, the average slope of the tangent between the center of the first end and the second end of the second plated steel plate region and the second end may be 45° or less.

[0012] In an embodiment of the present invention, the pressing portion may have a minimum radius of curvature at the second end of the second plated steel plate area, and a maximum radius of curvature at the first end of the second plated steel plate area.

[0013] In an embodiment of the present invention, the minimum radius of curvature may be 0.25 mm.

[0014] In an embodiment of the present invention, the thickness of the second plated steel plate region may be 10% to 90% of the thickness of the first plated steel plate region.

[0015] In an embodiment of the present invention, the second plating region may have a first thickness at the first end of the second plating steel plate region, but may have a second thickness that is less than or equal to the first thickness at the second end of the second plating steel plate region.

[0016] In an embodiment of the present invention, a third plating region may be further included that extends along the second direction and at least partially covers the cut portion.

[0017] In an embodiment of the present invention, the third plating region may have a thickness smaller than the second plating region.

[0018] In an embodiment of the present invention, the third plating area may have a smaller plating amount than the second plating area.

[0019] In an embodiment of the present invention, the second plating area may have a greater density than the first plating area.

[0020] In an embodiment of the present invention, the second steel plate region may have a greater density than the first steel plate region.

[0021] In an embodiment of the present invention, the width of the compression portion may be 0.25 mm to 4 mm.

[0022] In an embodiment of the present invention, the second plated steel sheet region may include a first pressing portion that is concave downward from the upper surface of the second plated region, and a second pressing portion that is arranged to face the first pressing portion and is concave upward from the lower surface of the second plated region.

[0023] A method for manufacturing a plated steel sheet according to one embodiment of the present invention may include the steps of supplying a plated steel sheet including a first plated steel sheet region including a first plated steel sheet region and a first steel sheet region, the step of pressing the plated steel sheet to form a second plated steel sheet region extending in a first direction and including a second plated steel sheet region, and the step of forming a cut portion extending along the second direction in the second plated steel sheet region.

[0024] In an embodiment of the present invention, in the step of forming the second plated steel plate region,

[0025] A pressing portion can be formed that is concave inwardly of the second plating region along the second direction, but has a width greater than the pressing depth.

[0026] In an embodiment of the present invention, the pressing pressure applied to the second plating area may be 5 kg / cm2 to 300 kg / cm2.

[0027] In an embodiment of the present invention, in the step of forming the cut portion, the cut portion may be formed to pass through the center of the compression portion.

[0028] In an embodiment of the present invention, in the step of forming the cut portion, a third plating region extending along the second direction and at least partially covering the cut portion may be further formed.

[0029] According to embodiments of the present invention, the plated steel sheet can minimize the area of ​​the steel sheet exposed to the outside by cutting by pressing the cutting portion to reduce the thickness and then cutting the pressed portion. This delays the time it takes for rust to form in the cut portion, thereby allowing the plated steel sheet to maintain improved corrosion resistance even after cutting.

[0030] In addition, since the pressing portion of the plated steel sheet is formed in a shape that is curved inward during the pressing process, compared to the case of pressing using a conventional sharp-shaped structure, the plating layer can be prevented from being damaged or peeled off during the pressing process. In addition, by applying pressure using a pressing portion that has a curved shape corresponding to the pressing portion during the pressing process, a portion where the thickness and plating amount are rapidly reduced in the pressing portion does not occur, so the corrosion resistance of the plated steel sheet can be further improved.

[0031] FIG. 1 is a perspective view illustrating a portion of a plated steel sheet according to one embodiment of the present invention.

[0032] Fig. 2 is a cross-sectional view showing the plated steel plate of Fig. 1 as viewed from the side.

[0033] Fig. 3 is a cross-sectional view showing the plated steel plate of Fig. 1 as viewed from the side.

[0034] FIG. 4 is a cross-sectional view showing a side view of a portion of a plated steel sheet according to another embodiment of the present invention.

[0035] FIG. 5a is a cross-sectional view showing a portion of a plated steel sheet before cutting processing according to another embodiment of the present invention.

[0036] Figure 5b is a cross-sectional view showing the plated steel plate of Figure 5a cut and processed.

[0037] Figure 6 schematically illustrates the appearance of the plated steel sheet manufacturing device according to the present invention before pressing and processing the plated steel sheet.

[0038] Figure 7 schematically illustrates a process in which a plated steel sheet manufacturing apparatus according to one embodiment of the present invention presses and processes a plated steel sheet.

[0039] Figure 8 schematically illustrates a plated steel sheet manufacturing apparatus according to another embodiment of the present invention performing compression processing on a plated steel sheet.

[0040] FIG. 9 illustrates a pressurizing unit of a compression unit according to one embodiment of the present invention, and the lower enlarged view of FIG. 9 illustrates a pressurizing unit according to another embodiment of the present invention.

[0041] Figure 10a illustrates a pressurizing section of another pressing unit of the present invention.

[0042] Figure 10b illustrates a pressurizing section of another pressing unit of the present invention.

[0043] Figure 11 is a cross-sectional view of a galvanized steel sheet before cutting after the pressing process is completed.

[0044] Figure 12 schematically illustrates the appearance of a plated steel sheet manufacturing apparatus according to another embodiment of the present invention before pressing a plated steel sheet.

[0045] Figure 13 schematically illustrates the steel plate processing device of Figure 11 performing compression processing on a plated steel plate.

[0046] Figure 14a shows a plated steel sheet before cutting processing.

[0047] Figure 14b illustrates a plated steel sheet in which a cut portion is formed by cutting processing.

[0048] Figure 15 schematically illustrates a state before the pressing process begins after the cutting process of the plated steel sheet according to the present invention is completed.

[0049] Figure 16 is an enlarged cross-sectional view of a plated steel sheet and a portion thereof manufactured after cutting and pressing processes are completed.

[0050] Hereinafter, with reference to the attached drawings, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention. However, in describing preferred embodiments of the present invention in detail, if it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for parts that have similar functions and actions. In addition, in this specification, terms such as “upper,” “upper part,” “top surface,” “lower,” “lower side,” “lower surface,” and “side” are based on the drawings, and in reality, they may vary depending on the direction in which the components are arranged.

[0051] Additionally, throughout the specification, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly connected" with other components intervening. Furthermore, unless specifically stated otherwise, "including" a component does not exclude other components, but rather implies the inclusion of other components.

[0052] FIG. 1 is a perspective view illustrating a portion of a plated steel sheet according to one embodiment of the present invention.

[0053] Referring to Fig. 1, a plated steel sheet (10) according to one embodiment of the present invention (hereinafter, Example 1) may include a steel sheet (11) and a plated layer (12). The steel sheet (11) may have a long plate shape.

[0054] For example, the plated steel sheet (10) can be manufactured by forming a plated layer (12) on a steel sheet (11), pressing a portion of the plated layer (12), and then cutting it into a predetermined length. As another example, the plated steel sheet (10) can also be manufactured by forming a plated layer (12) on a steel sheet (11), cutting the plated steel sheet (10) into a predetermined length, and then pressing the cut portion (hereinafter, “cut portion”) (14). At this time, the plated steel sheet (10) can be cut into various lengths based on the intended use of the plated steel sheet (10), etc.

[0055] A plating layer (12) can be formed on a steel plate (11). At this time, the plating layer (12) partially covers the outer surface of the steel plate (11), thereby improving the corrosion resistance and durability of the steel plate (11).

[0056] As a plating material forming the plating layer (12), for example, zinc can be used. In addition, the plating layer (12) can be formed by adding a small amount of aluminum and magnesium to zinc. In this case, the plating layer (12) can be configured to contain 10% to 15% aluminum, 4% to 6% magnesium, and 79% to 86% zinc, but is not limited thereto. Meanwhile, the plating layer (12) can be formed by a method such as electroplating or hot dip plating.

[0057] The plating layer (12) may include a first plating portion (12a) covering the upper surface of the steel plate (11) and a second plating portion (12b) covering the lower surface of the steel plate (11). Accordingly, the plating layer (12) may be formed on the upper and lower surfaces of the steel plate (11). According to an embodiment, the plating layer (12) may not be formed on the side surface (11a) of the steel plate (11). According to another embodiment, the plating layer (12) may be partially formed by extending a portion of the side surface (11a) of the steel plate (112).

[0058] Figure 2 illustrates a side view of the plated steel plate of Figure 1.

[0059] Referring to FIG. 2, the plated steel plate (10) may include a first plated steel plate area (A10) and a second plated steel plate area (A20).

[0060] The first plated steel plate area (A10) may include a first steel plate area (A11) and a first plated area (A12).

[0061] The first steel plate area (A11) may be in the form of a plate extending along the first direction (B1) to have the same or similar thickness. In this case, the first steel plate area (A11) may include a portion of a steel plate (A21) whose thickness has been reduced by compression processing. In this case, the portion of the steel plate (A21) whose thickness has been reduced may be arranged at a portion connected to the second steel plate area (A21) described later.

[0062] The first plating area (A12) is an area where compression processing is not directly performed on the plating layer (12), and may be formed on the first steel plate area (A11). More specifically, the first plating area (A12) may cover the upper and lower surfaces of the first steel plate area (A11). At this time, the first plating area (A12) may not be formed on both side surfaces (11a) of the first steel plate area (A11), or may be formed only partially.

[0063] The second plated steel plate area (A20) is an area of ​​the plated steel plate (10) where compression processing is performed, and may be arranged to be continuous with the first plated steel plate area (A10). More specifically, the first end (E1) of the second plated steel plate area (A20) may be continuous with the first plated steel plate area (A10). In addition, the second end (E2) of the second plated steel plate area (A20) may be formed in an area extending in the opposite direction of the first plated steel plate area (A10) along the first direction (B1). Here, the first direction (B1) may be a width direction of the plated steel plate (10) and may be a direction parallel to the Y-axis direction in the drawing. A cut portion (14) is formed at the second end (E2) of the second plated steel plate area (A20), which will be described later.

[0064] The second plated steel plate area (A20) may include a second steel plate area (A21) and a second plating area (A22). The second plated area (A22) may be formed on the upper and lower surfaces of the second steel plate area (A21). At this time, the second plated area (A22) may not be formed on the two side surfaces (11a) of the second steel plate area (A21), or may be formed only partially.

[0065] The second plated steel sheet area (A20) may include a pressing portion (13) and a cutting portion (14). The pressing portion (13) may be formed by the pressing process described above. The pressing portion (13) may have an inwardly concave shape on one surface of the second plated area (A22). The above-described one surface of the second plated area (A22) may be either the upper surface or the lower surface of the second plated area (A22). Accordingly, the pressing portion (13) may be formed to be concave inward from the upper surface or the lower surface of the second plated area (A22) along the second direction (B2) by a pressing depth (P1). Here, the second direction (B2) is a thickness direction of the plated steel sheet (10) and may be a direction parallel to the Z-axis direction in the drawing.

[0066] The pressing depth (P1) may vary along the width direction (i.e., the first direction) (B1) of the pressing portion (13). More specifically, the pressing depth (P1) may increase from the first end (E1) of the second galvanized steel plate region (A20) toward the second end (E2) along the first direction (B1). In this case, the pressing depth (P1) of the pressing portion (13) may be minimum at the first end (E1) and maximum at the second end (E2).

[0067] For example, the pressing portion (13) may have a shape that is curved toward the inside of the second plated steel plate area (A20). In this case, when viewed from the side (e.g., in the YZ plane direction), the pressing portion (13) may extend in a curved shape along the first direction (B1). At this time, the pressing portion (13) may be formed so that its width (L1) is greater than the pressing depth (P1). Accordingly, the pressing portion (13) having a curved shape may have a minimum radius of curvature at the second end (E2) of the second plated steel plate area (A20) and a maximum radius of curvature at the first end (E1) of the second plated steel plate area (A20). At this time, the minimum radius of curvature may be, for example, 0.25 mm, and in this case, the radius of curvature of the pressing portion (13) may be 0.25 mm or more.

[0068] Because it is formed in a curved shape, the slope (θ) of the tangent line (TL) of the pressing portion (13) can change along the first direction (B1). More specifically, the slope (θ) of the tangent line (TL) can be minimized at the second end (E2) of the second plated steel plate area (A20) where the pressing depth (P1) is maximum. At this time, the slope (θ) of the tangent line (TL) can gradually increase as it goes toward the first end (E1) of the second plated steel plate area (A20) along the first direction (B1). Accordingly, the slope (θ) of the tangent line (TL) can be maximized at the first end (E1) of the second plated steel plate area (A20) where the pressing depth (P1) is minimum. At this time, the slope of the tangent line (TL) at the center (C') of the pressing portion (13) with respect to the first direction (B1) may have a size between the maximum slope and the minimum slope described above. In this case, the pressing portion (13) may be formed so that the average slope of the tangent line (TL) from the second end (E2) of the second plated steel plate area (A20) to the center (C') of the pressing portion (13) is 45° or less.

[0069] The second plating steel sheet area (A20) may include two pressing portions (13). In this case, one of the two pressing portions (13) (hereinafter, the first pressing portion) (13a) may be formed to be concave downward from the upper surface of the second plating area (A22). In addition, the other of the two pressing portions (13) (hereinafter, the second pressing portion) (13b) may be formed to be concave upward from the lower surface of the second plating area (A22). At this time, the first pressing portion (13a) and the second pressing portion (13b) may be arranged to face each other along the second direction (B2).

[0070] Meanwhile, for convenience of explanation, the description will focus on the case where the first compression member (13a) and the second compression member (13b) are sunken in opposite directions but have the same shape and size, but the present invention is not limited thereto.

[0071] The cut portion (14) can be formed by cutting the cut target portion of the plated steel plate (10) (see CP of Fig. 6) along the cutting direction. At this time, the cutting direction can be a direction parallel to the second direction (B2).

[0072] For example, the cut portion (14) can be formed by cutting the press portion (13AA, 13BB in FIG. 8) after the press processing is completed. For example, the cut portion (14) can be formed by cutting along a direction parallel to the second direction (B2) and passing through the center (C) of the press portion (13AA, 13BB in FIG. 9) before cutting. In addition, when two press portions (13) are provided, the cut portion (14) can be formed by cutting along a direction parallel to the second direction (B2) and passing through the common center (C) of the first press portion (13AA) before cutting and the second press portion (13BB) before cutting. By cutting in this way, the cut portion (14) can be arranged at the second end (E2) of the second plated steel plate area (A20) in the plated steel plate (10) after the cutting processing is completed.

[0073] In addition, when viewed from the side (e.g., in the ZX plane direction) along the first direction (B1), a steel plate (11) may be arranged in the center region (14a) of the cut portion (14). And, a plating layer (12) may be arranged in the border region (24b) surrounding the center region (14a) of the cut portion (14). Through the center region (14a) of the cut portion (14), a portion of the second steel plate region (A21) may be exposed to the outside.

[0074] As another example, the cut portion (14) may be formed before the pressing portion (13). In this case, once the cutting process for the plated steel sheet (10) is completed, the pressing process may be performed centering on the formed cut portion (14). As a result, the pressing portion (13) may be formed. At this time, the specific characteristics of the pressing portion (13) and the cutting portion (14) are the same or similar to those described above, so a duplicate description will be omitted.

[0075] Fig. 3 is a cross-sectional view showing the plated steel plate of Fig. 1 as viewed from the side.

[0076] Referring to Fig. 3, the thickness of the second plated steel plate area (A20) may be less than or equal to the thickness (T1) of the first plated steel plate area (A10). Since a pressing portion (13) having a pressing depth (P1) that changes along the first direction (B1) is formed in the second plated steel plate area (A20), the thickness of the second plated steel plate area (A20) may also vary along the first direction (B1).

[0077] More specifically, the second plated steel plate region (A20) may have a maximum thickness at the first end (E1). In addition, the thickness of the second plated steel plate region (A20) may gradually decrease as it goes toward the second end (E2) along the first direction (B1), and may have a minimum thickness (2T2a+T3a) at the second end (E2). At this time, the maximum thickness of the second plated steel plate region (A20) may be the same as the thickness (T1) of the first plated steel plate region (A10). Accordingly, the thickness of the second plated steel plate region (A20) between the first end (E1) and the second end (E2) may be smaller than the thickness (T1) of the first plated steel plate region (A10). The thickness (i.e., minimum thickness) at the second end (E2) of the second plated steel plate area (A20) may be 10% to 90% of the thickness (T1) of the first plated steel plate area (A10).

[0078] In addition, during the pressing process, the steel plate (11) may be pressed together with the plating layer (12) to reduce its thickness. At this time, the first steel plate area (A11) may have a minimum thickness (T3a) at the second end (E2) where the pressing depth (P1) becomes maximum. In this case, the second end (E2) is a portion where the cut portion (14) is formed, and the thickness (T3a) of the first steel plate area (A11) at the cut portion (14) becomes minimum. As a result, the area of ​​the steel plate (11) exposed to the outside through the cut portion (14) can be minimized.

[0079] The width of the second plated steel plate area (A20) may be greater than the above-mentioned pressing depth (P1) of the pressing portion (13). At this time, the width of the second plated steel plate area (A20) may be the same as the width (L1) of the pressing portion (13). Accordingly, the pressing portion (13) may have a shape in which the width (L1) is greater than the pressing depth (P1). At this time, the width (L1) of the pressing portion (13) may be, for example, 0.25 mm to 4 mm.

[0080] As described above, since the pressing process is performed only on the second plating steel sheet area (A20), the second plating area (A22) may have a higher density than the first plating area (A12). This may be a result of performing the pressing process so that the second plating area (A22), which is a portion of the plating layer (12) having the same or similar thickness before the pressing process, is pressed inwardly toward the plating steel sheet (10) along the vertical direction (Z).

[0081] In addition, since a portion of the steel plate (11) corresponding to the second steel plate area (A21) is pressed together during the pressing process, the second steel plate area (A21) can have a greater density than the first steel plate area (A11).

[0082] The thickness of the second plating area (A22) formed by the pressing process may be thinner than the thickness (T2) of the first plating area (A12) that is not pressed. As described above, since the pressing portion (13) having a curved shape minimizes the slope (θ) and the radius of curvature of the tangent line (TL) at the second end (E2) of the second plating steel plate area (A20), the second plating area (A22) can maintain a predetermined thickness (T2a) at the second end (E2). That is, since the pressing portion (13) is pressed in a curved shape, the plating layer (12) at the second end (E2) of the second plating steel plate area (A20) can be prevented from being damaged or peeled off during the pressing process.

[0083] The thickness of the second plating area (A22) may, for example, have the same or similar thickness throughout the longitudinal direction (first direction) (B1) of the second plating area (A22), but the present invention is not limited thereto. As another example, the thickness (second thickness) of the second plating area (A22) may be smaller at the second end (E2) than at the first end (E1) (first thickness). According to an embodiment, the second plating area (A22) may have a maximum thickness at the first end (E1) and may slightly decrease toward the second end (E2) along the first direction (B1), such that the thickness (T2a) at the second end (E2) may become a minimum. At this time, the density of the second plating area (A22) may become a maximum at the second end (E2) where the thickness is a minimum, and may become a minimum at the first end (E1) where the thickness is a maximum.

[0084] FIG. 4 is a cross-sectional view showing a side view of a portion of a plated steel sheet according to another embodiment of the present invention.

[0085] Referring to FIG. 4, a plated steel sheet (10A) according to another embodiment of the present invention (hereinafter, Example 2) may include a first plated steel sheet region (A10) and a second plated steel sheet region (A20), and since the specific characteristics thereof are the same or similar to those of the aforementioned Example 1, a redundant description thereof will be omitted. In addition, the plated steel sheet (10A) according to Example 2 may further include a third plated region (A30).

[0086] The third plating area (A30) may be arranged on the cut portion (14). The third plating area (A30) may be formed to at least partially cover the cut portion (14). At this time, the third plating area (A30) may be continuous with the second plating area (A22) and may extend along the second direction (B2).

[0087] As the pressing portions (13) are formed at the upper and lower ends of the second plated steel plate area (A20), respectively, the plated steel plate (10A) can include two third plated areas (A30). In this case, the third plated area (hereinafter, upper third plated area) (A31) disposed on the upper side with respect to the second direction (B2) can be connected to the second plated area (hereinafter, upper second plated area) (A22) disposed on the upper end of the second plated steel plate area (A20). More specifically, the upper end of the upper third plated area (A31) can be connected to the upper second plated area (A22), and the lower end of the upper third plated area (A31) can extend downward along the second direction (B2).

[0088] And, based on the second direction (B2), the third plating region (hereinafter, lower third plating region) (A32) disposed at the lower side can be connected to the second plating region (hereinafter, lower second plating region) (A22) disposed at the lower side of the second plating steel plate region (A20). More specifically, the lower side of the lower third plating region (A32) is connected to the lower second plating region (A22), and the upper side of the lower third plating region (A32) can extend upward along the second direction (B2).

[0089] The upper third plating area (A31) and the lower third plating area (A32) may, for example, be connected to each other. In this case, the lower portion of the upper third plating area (A31) and the upper portion of the lower third plating area (A32) may be connected so as to be at least partially continuous. As another example, the lower portion of the upper third plating area (A31) and the upper portion of the lower third plating area (A32) may be spaced apart from each other.

[0090] The third plating area (A30) as described above may be formed by a portion of the plating component included in the second plating area (A22) moving during the cutting process of the plated steel sheet (10). Accordingly, the second plating area (A30) may have a smaller plating amount than the second plating area (A20). In addition, the thickness of the third plating area (A30) may be smaller than the thickness of the second plating area (A22). In this case, the upper third plating area (A31) may have a thickness that decreases from the top to the bottom, but as another example, may be formed to have the same or similar thickness overall along the second direction (B2). In addition, the lower third plating area (A32) may have a thickness that decreases from the bottom to the top, but as another example, may be formed to have the same or similar thickness overall along the second direction (B2).

[0091] Fig. 5a is a cross-sectional view illustrating a portion of a plated steel sheet before cutting processing according to another embodiment of the present invention. Fig. 5b is a cross-sectional view illustrating the plated steel sheet of Fig. 5a after cutting processing.

[0092] Referring to FIGS. 5A and 5B, a plated steel sheet (10B) according to another embodiment of the present invention (hereinafter, Example 4) may include a first plated steel sheet region (A10) and a second plated steel sheet region (A20). At this time, since the specific characteristics of the first plated steel sheet region (A10) are the same or similar to those of the aforementioned Example 1, overlapping descriptions will be omitted, and descriptions will be focused on differences.

[0093] As illustrated in Fig. 5a, after the pressing process is completed, a pressing portion (13AA) may be formed only at the upper end of the plated steel sheet (10B). At this time, the pressing portion (13AA) may be a pressing portion before cutting and may have a width (2L1) greater than that of the pressing portion (13) after the cutting process is completed. In this case, the lower end of the plated steel sheet (10B) may be in a flat shape without performing the pressing process.

[0094] In the case of the plated steel sheet (10B) on which the cutting process is completed, as illustrated in FIG. 5B, the second plated steel sheet region (A20) may include one pressing portion (13). In this case, since only one pressing portion (13) is formed, the cut portion (14A) may have a different thickness (T3A) than that of Example 1 or Example 2. In addition, the area of ​​the second steel sheet region (A21) exposed to the outside through the cutting portion (14A) may also be different from that of Example 1 or Example 2. However, in the case of the plated steel sheet (10A) according to Example 3, since the pressing portion (13) having an inwardly curved shape is formed in the second plated steel sheet region (A20), the area of ​​the steel sheet (11) exposed to the outside after the cutting process is reduced, thereby delaying the time for rust generation in the cut portion (14A).

[0095] Meanwhile, in the examples described above, for the convenience of explanation, each region of the plated steel plate (10, 10A, 10B) is referred to separately, but the first plated steel plate region (A10) and the second plated steel plate region may mean each region of a single plated steel plate (10, 10A, 10B).

[0096] FIG. 6 schematically illustrates a state of a plated steel sheet manufacturing apparatus according to the present invention before pressing a plated steel sheet. FIG. 7 schematically illustrates a state of a plated steel sheet manufacturing apparatus according to one embodiment of the present invention pressing a plated steel sheet. FIG. 8 schematically illustrates a state of a plated steel sheet manufacturing apparatus according to another embodiment of the present invention pressing a plated steel sheet. FIG. 9 illustrates a pressing unit of a pressing unit according to one embodiment of the present invention, and the lower enlarged view of FIG. 9 illustrates a pressing unit according to another embodiment of the present invention. FIG. 10a illustrates a pressing unit of another pressing unit of the present invention. FIG. 10b illustrates a pressing unit of another pressing unit of the present invention. FIG. 11 is a cross-sectional view illustrating a plated steel sheet before cutting after pressing is completed.

[0097] Referring to FIGS. 6 to 11, the plated steel sheet manufacturing device (20) can press-process a portion of the plated steel sheet (10) before cutting the plated steel sheet (10). As a result, a press portion (13) can be formed. Hereinafter, for convenience of explanation, the case in which the plated steel sheet processing device (20) manufactures the plated steel sheet (10) according to Example 1 will be described, but the present invention is not limited thereto.

[0098] The plated steel sheet (10), which is a pressing processing object, can be formed by including a steel sheet (11) and a plating layer (12a, 12b) covering the outer surface of the steel sheet (11). For example, the plated steel sheet (10) is a ternary plated steel sheet, and in this case, the plating layer (12a, 12b) may include, but is not limited to, 10 to 15% of aluminum, 4 to 6% of magnesium, and 79 to 86% of zinc.

[0099] A plated steel sheet manufacturing apparatus (20) according to one embodiment of the present invention (hereinafter, Example 1) may include a pair of pressing units (100, 200). Hereinafter, one of the pair of pressing units will be referred to as a first pressing unit (100), and the other of the pair of pressing units will be referred to as a second pressing unit (200).

[0100] The first pressing unit (100) and the second pressing unit (200) may be arranged to face each other. For example, when pressing a plated steel plate (10), the first pressing unit (100) and the second pressing unit (200) may be arranged symmetrically with respect to the plated steel plate (10). At this time, the first pressing unit (100) may be arranged on the upper side of the plated steel plate (10), and the second pressing unit (200) may be arranged on the lower side of the plated steel plate (10).

[0101] At least one of the first pressing unit (100) and the second pressing unit (200) may be configured to be movable. For example, both the first pressing unit (100) and the second pressing unit (200) may be movable. In this case, the pressing units (100, 200) may move closer to each other or move away from each other in the vertical direction of the drawing, with the plated steel plate (10) interposed therebetween.

[0102] As another example, only one of the first compression unit (100) and the second compression unit (200) may be configured to be elevated. In this case, one of the compression units (100, 200) may be fixed, while the other of the compression units (100, 200) may be elevated. For convenience of explanation, the following description will focus on a case where both compression units (100, 200) are provided to be elevated.

[0103] The first compression unit (100) may include a body (hereinafter, first body) (110), a connecting portion (hereinafter, first connecting portion) (120), and a pressurizing portion (hereinafter, first pressurizing portion) (130).

[0104] The first body (110) is a portion where other components of the first compression unit (100) are installed and supported, and can be connected to a driving unit (not shown). The first body (110) can be raised and lowered along the first lifting direction (D1) using the driving force provided from the driving unit.

[0105] The first body (110) may have various shapes. More specifically, the first body (110) may be formed in a shape extending along a first direction (A1). In this case, the first direction (A1) may be a direction parallel to the floor surface of the building in which the plated steel sheet manufacturing device (20, 20A) is installed (or the left-right direction in the drawing), but is not limited thereto. For example, the first body (110) may be formed in a cylindrical shape extending along the first direction (A1).

[0106] The first connecting portion (120) may be coupled to the first body (110). At this time, the first connecting portion (120) may be formed to extend along a second direction (A2) that is different from the first direction (A1), which is the extension direction of the first body (110). In the drawing, the second direction (A2) is illustrated as being perpendicular to the first direction (A1), but this is only one embodiment, and the second direction (A2) may of course be an oblique direction inclined at a predetermined angle with respect to the first direction (A1). However, for the convenience of explanation, the description will be centered on the case where the second direction (A2) is perpendicular to the first direction (A1). In this case, the second direction (A2) may be a direction parallel to the first lifting direction (D1) described above.

[0107] The first connecting portion (120) may have a length longer than the thickness of the first body (110). Accordingly, both ends (upper and lower ends) of the first connecting portion (120) may protrude from the first body (110) based on the first lifting direction (D1). More specifically, the first connecting portion (120) may protrude outward from the outer surface of the first body (110). In addition, the first connecting portion (120) may be formed in a shape that wraps around the outer surface along the circumferential direction of the first body (110). For example, when the first body (110) has a cylindrical shape, the first connecting portion (120) may be formed in a ring shape or a similar shape that extends along the circumferential direction of the first body (110) and wraps around the outer surface of the first body (110).

[0108] The first pressurizing portion (130) may be a portion that directly presses the upper surface of the plated steel plate (10) during pressing processing. The first pressurizing portion (130) may be arranged on the first connecting portion (120). At this time, the first pressurizing portion (130) may be in a form that protrudes outward from the outer surface of the first connecting portion (120). The end of the first pressurizing portion (130) that protrudes outward in this manner will be referred to as the first outer end (130a).

[0109] The first pressurizing portion (130) can surround the outer surface of the first connecting portion (120). More specifically, the first pressurizing portion (130) can extend along the circumferential direction of the first connecting portion (120) so as to surround the outer surface of the first connecting portion (120). At this time, the first pressurizing portion (130) can extend in the circumferential direction of the first connecting portion (120) described above, and its two ends can meet each other in a ring-like shape. Accordingly, the first outer end (130a) can also protrude outward from the first connecting portion (120) and extend along the circumferential direction of the first connecting portion (120).

[0110] For example, the first pressurizing portion (130) may be provided as a separate configuration from the first connecting portion (120) and may be fixedly connected to the first connecting portion (120). As another example, the first pressurizing portion (130) may be in the form of a protrusion formed integrally with the first connecting portion (120).

[0111] The first outer end (130a) of the first pressurizing portion (130) may have an at least partially rounded shape. More specifically, the first outer end (130a) may have a hemispherical shape with a circular cross-section. Accordingly, the lower surface (131a) of the first outer end (130a) may have a shape that is curved with a constant curvature overall.

[0112] The width (L2) of the first pressurizing portion (130) may be smaller than the width of the first connecting portion (120). At this time, the outer surface of the first connecting portion (120) may be parallel to the longitudinal direction (first direction) (A1) of the plated steel plate (10). Accordingly, when the plated steel plate manufacturing device (20) is viewed from the side, as illustrated in FIG. 9, a hemispherical first outer end (130a) may be provided in a form that protrudes outward at the center of the outer surface of the first connecting portion (120) extending parallel to the first direction (A1). Meanwhile, the width (L2) of the first pressurizing portion (130) may be, for example, 0.5 mm to 8 mm, but this may of course be changed depending on the intended use of the plated steel plate (10).

[0113] As another embodiment, the first pressurizing portion (130) may further include a protrusion (132a) on the first outer end (130a), as exemplarily illustrated in the lower drawing of FIG. 9. In this case, the protrusion (132a) may further protrude outward from the outer surface (131a) of the first outer end (130a). The protrusion (132a) may extend along the circumferential direction of the first pressurizing portion (130) and may be formed to surround the outer surface (131a) of the first pressurizing portion (130). At this time, the protrusion (132a) may have a hemispherical cross-section having a diameter smaller than the width (L2) of the first pressurizing portion (130).

[0114] In this way, since the first pressurizing portion (130) has a multi-stage structure including the first outer end portion (130a) and the protrusion portion (132a), the plated steel sheet (10) can be pressed to a deeper depth. As a result, the thickness of the pressed portion of the plated steel sheet (10) (see T3 of FIG. 10) can be further reduced. In addition, the protrusion portion (132a) can be formed to have a narrower width than the first outer end portion (130a). By cutting the pressed portion to a narrow width in this way, the area of ​​the steel sheet (11) exposed to the outside by the cutting process can be minimized.

[0115] The first pressurizing portion (130) may be provided in multiple numbers. At this time, the first connecting portion (120) on which the first pressurizing portion (130) is arranged may also be provided in multiple numbers, the same number as the first pressurizing portion (130). In this case, the first connecting portion (120) and the first pressurizing portion (130) arranged thereon may be arranged at a predetermined interval along the longitudinal direction of the first body (110). For example, the distance between adjacent first pressurizing portions (130) may be the same. However, since the distance between the first pressurizing portions (130) corresponds to the length of the plated steel sheet (10) after cutting, it may be changed depending on the intended use of the cut plated steel sheet (10).

[0116] The second pressing unit (200) can be arranged to face the first pressing unit (100). Accordingly, when the plated steel sheet (10) is introduced between the first pressing unit (100) and the second pressing unit (200), the first pressing unit (100) and the second pressing unit (200) can be pressed.

[0117] The second compression unit (200) may be equipped with a body (hereinafter, the second body) (210), a connecting portion (hereinafter, the second connecting portion) (220), and a pressurizing portion (hereinafter, the second pressurizing portion) (230). Since the specific characteristics of these are the same or similar to those of the first compression unit (100) described above, redundant descriptions will be omitted and descriptions will be focused on the differences.

[0118] The second body (210) is a portion where other components of the second compression unit (200) are installed, and is connected to a driving unit (not shown) so that it can be operated to rise and fall along the second elevation direction (D2). The second body (210) may have a shape identical to or similar to that of the first body (110). For example, the second body (210) may have a cylindrical shape extending along the first direction (A1) described above.

[0119] The second connecting portion (220) may be coupled to the second body (210) so as to extend along a third direction (A3) different from the first direction (A1). For example, the third direction (A3) may be perpendicular to the first direction (A1). In this case, the third direction (A3) may be the same as or parallel to the second direction (A2). Although the present invention is not limited thereto, the following description will focus on the case where the third direction (A3) is the same as or parallel to the second direction (A2).

[0120] The second pressurizing portion (230) may be a portion that directly presses the lower surface of the plated steel plate (10) during pressing processing. The second pressurizing portion (230) may be arranged on the second connecting portion (220). At this time, the second pressurizing portion (230) may be in a form that protrudes outward from the outer surface of the second connecting portion (220). The end of the second pressurizing portion (230) that protrudes outward in this manner will be referred to as the second outer end.

[0121] Since the second connecting portion (220) is formed to extend in the same direction as the first connecting portion (120), the second pressurizing portion (230) can be arranged symmetrically with the first pressing portion (130) along the second direction (A2) or the third direction (A3). In addition, when a plurality of second pressing portions (230) are provided, the second pressing portions (230) can be arranged to face the plurality of first pressing portions (130) arranged on the upper side one-to-one.

[0122] Referring again to FIGS. 6 and 7, the plated steel sheet manufacturing device (20) according to Example 1 can be configured such that the first pressing unit (100) and the second pressing unit (200) can rotate.

[0123] More specifically, the first compression unit (100) can rotate the first body (110) around the first rotation axis (C1). At this time, the first rotation axis (C1) can pass through the center of the first body (110) and extend parallel to the first direction (A1). As the first body (110) rotates, the first connecting portion (120) and the first pressing portion (130) can also rotate together. In addition, the second compression unit (200) can rotate the second body (210) around the second rotation axis (C2). At this time, the second rotation axis (C2) can pass through the center of the second body (210) and extend parallel to the first direction (A1). As the second body (210) rotates, the second connecting portion (220) and the second pressing portion (230) can also rotate together. At this time, the first pressurizing part (130) and the second pressurizing part (230) may be configured in the form of a pressurizing roll.

[0124] In this case, the plated steel sheet (10) can be supplied between the rotating first pressing unit (100) and the second pressing unit (200). At this time, one end of the plated steel sheet (10) wound in a coil shape can be unwound and supplied between the pressing units (100, 200). The upper and lower ends of the supplied plated steel sheet (10) are pressed by the rotating first pressing unit (130) and the second pressing unit (230), thereby performing pressing processing.

[0125] In this way, during the pressing process, one surface (i.e., the upper surface) of the plated steel plate (10) may be pressed downward by the first pressing portion (130), and the other surface (i.e., the lower surface) of the plated steel plate (10) may be pressed upward by the second pressing portion (230). As a result, a pair of pressing portions (13) may be formed in the plated steel plate (10). At this time, since the first pressing portion (130) and the second pressing portion (230) are arranged symmetrically, the pair of pressing portions (13) may also be formed at positions symmetrical to each other so that their centers (C) are arranged on the same line.

[0126] Referring to FIGS. 6 and 8, a plated steel sheet manufacturing apparatus (20A) according to another embodiment of the present invention (hereinafter, Embodiment 2) may include a first pressing unit (100) and a second pressing unit (200). At this time, most of the features of the pressing units (100, 200) are the same or similar to those of Embodiment 1 described above, and thus, the description will focus on the differences.

[0127] The first pressing unit (100) and the second pressing unit (200) are arranged to face each other, which is the same as in the aforementioned embodiment 1. In this arrangement, the pressing units (100, 200) can be raised or lowered to approach or move away from each other. Before the first pressing unit (100) and the second pressing unit (200) begin to ascend or descend toward each other, a gap exists between the pressing units (100, 200), and a plated steel sheet (10) can be supplied into this gap. At this time, the supplied plated steel sheet (10) may be in the form of a flat plate. When such a plated steel plate (10) is supplied, the first pressing unit (100) can be lowered toward the upper surface of the plated steel plate (10), and the second pressing unit (200) can be raised toward the lower surface of the plated steel plate (10).

[0128] In this way, when the first body (110) is lowered, the first connecting portion (120) and the first pressurizing portion (130) can also be lowered together. Accordingly, the outer surface (131a) of the first outer end (130a) of the first pressurizing portion (130) can come into contact with the upper plating layer (12a) of the plated steel sheet (10). In addition, as the second body (210) rises, the second connecting portion (220) and the second pressurizing portion (230) also rise together, so that the outer surface of the second outer end of the second pressurizing portion (230) can come into contact with the lower plating layer (12b) of the plated steel sheet (10).

[0129] Thereafter, as illustrated in FIG. 8, the first body (110) can be lowered further, and the second body (210) can be raised further. Accordingly, the first pressurizing portion (130) can press the plated steel sheet (10) downward while the outer surface (131a) of the first outer end (130a) is in contact with the upper plating layer (12a). In addition, the second pressurizing portion (230) can press the plated steel sheet (10) upward while the outer surface of the second outer end is in contact with the lower plating layer (12b).

[0130] In this way, as the plated steel sheet (10) is pressed in the vertical direction, the upper plating layer (12a) is pressed to form a press portion (upper press portion) (23) in the shape of a groove that is concave inward, and the lower plating layer (12b) is pressed to form a press portion (lower press portion) (13) in the shape of a groove that is concave inward.

[0131] As described above, when performing the pressing process, the upper surface of the plated steel plate (10) is pressed downward by the first pressing portion (130), and the lower surface of the plated steel plate (10) is pressed upward by the second pressing portion (230), thereby forming a pair of pressing portions (13). At this time, since the first pressing portion (130) and the second pressing portion (230) are arranged symmetrically, the pair of pressing portions (13) can also be formed at positions symmetrical to each other so that their centers (C) are arranged on the same line.

[0132] Fig. 10a illustrates a pressurizing portion of another pressing unit of the present invention. And, Fig. 10b illustrates a pressurizing portion of another pressing unit of the present invention.

[0133] Referring to Fig. 10a, the first outer end (130b) of the first pressurizing portion (130) according to another embodiment of the present invention may have an elliptical cross-section when viewed from the side. In this case, the width and protrusion distance of the first outer end (130b) may be different from those of the first outer end (130a) having a circular cross-section. For example, the first outer end (130b) having an elliptical cross-section may have a larger width than the first outer end (130a) having a circular cross-section. In addition, the first outer end (130b) may be formed to have a shorter or the same protrusion distance as the first outer end (130a).

[0134] Referring to FIG. 10b, the first outer end (130c) of the first pressurizing portion (130) according to another embodiment of the present invention may have a rectangular cross-section with rounded corners when viewed from the side. The width and protrusion distance of this first outer end (130b) may be different from those of the first outer ends (130a, 130b) described above. For example, the first outer end (130c) having a cross-section similar to a rectangular shape may be formed to have a smaller width than the first outer ends (130a, 130b) described above, but is not limited thereto.

[0135] Meanwhile, although only the first pressurizing portion (130) is illustrated in FIGS. 10a and 10b, the second pressurizing portion (230) may also have the same shape as the first pressurizing portion (130) facing it, and it goes without saying that different shapes of pressurizing portions may be included in one plated steel sheet manufacturing device (20) as described above.

[0136] In this way, since the pressurizing portion (130, 230) is formed in a curved shape overall or at least in a corner portion, it is possible to prevent pressure from being concentrated on a portion of the plating layer (12a, 12b). Accordingly, the plating layer (12a, 12b) is prevented from being torn or peeled off during the pressing process, as is the case when the pressurizing portion has a sharp shape, thereby effectively suppressing the occurrence of rust on the plating steel sheet (10) after cutting.

[0137] Meanwhile, when the first and second pressurizing units (230) press the plated steel plate (10), a pressure within a predetermined range may be applied. The pressure applied during the pressing operation may be, for example, within a range of 5 to 300 kg / cm2, and preferably 5 to 50 kg / cm2. This pressure may be adjusted based on at least one of the physical properties of the plated steel plate (10), such as the thickness or strength, or the number of pressurizing units (130, 230). For example, when the number of pressurizing units (130, 230) provided in the device (10), or the thickness or strength of the plated steel plate (10) increases, the applied pressure may also increase.

[0138] Meanwhile, the plated steel sheet manufacturing device (20) may further include a control unit (not shown). The control unit may control the operation of the plated steel sheet manufacturing device (20). At this time, the control unit may be implemented in the form of, for example, a circuit board mounted on a control computer of the plated steel sheet manufacturing device (20), a computer chip mounted on a circuit board, software embedded in a computer chip or embedded in a control computer.

[0139] The method by which the control unit controls the plated steel sheet manufacturing device (20) may be as follows. First, the plated steel sheet (10), which is a pressing operation target, may be supplied between the pressing units (100, 200). At this time, the first pressing unit (100) and the second pressing unit (200) may be spaced apart by a predetermined distance so that the plated steel sheet (10) may be transported between them. In addition, the supply of the plated steel sheet (10) may be performed by a separate transport device (not shown), such as a conveyor.

[0140] Next, the control unit can determine (calculate) the pressing pressure based on the physical properties (e.g., thickness, strength, etc.) of the supplied plated steel sheet (10). At this time, the physical properties of the plated steel sheet (10) may be values ​​previously input into the control unit by the operator, or may be obtained by measurement by a sensor (not shown) provided in the device (10).

[0141] Next, the control unit can elevate the pressing units (100, 200) so that they approach each other. More specifically, the control unit can cause the first pressing unit (100) to descend toward the plated steel plate (10) and the second pressing unit (200) to ascend toward the plated steel plate (10). At this time, in the case of Example 1, the control unit can cause the pressing units (100, 200) to rotate.

[0142] While rotating in this way, the first pressing portion (130) can come into contact with the upper plating layer (12a), and the second pressing portion (230) can come into contact with the lower plating layer (12b). Thereafter, as the pressing portions (130, 230) continue to rotate, the plating layers (12a, 12b) can be pressed. As a result, a pair of pressing portions (13) can be formed at positions symmetrical in the up-down direction on the upper and lower surfaces of the plated steel sheet (10).

[0143] Meanwhile, in the case of Example 2, the control unit can further lower the first pressing unit (100) and further raise the second pressing unit (200) after the first pressing unit (130) comes into contact with the upper plating layer (12a) and the second pressing unit (230) comes into contact with the lower plating layer (12b). As a result, the plated steel sheet (10) can be pressed in the vertical direction with the pressure determined (calculated) as described above, thereby forming a pair of pressing units (13).

[0144] Next, the control unit can raise and lower the pressing units (100, 200) so that they are spaced apart from each other when the pressing units (13) are formed at a predetermined depth (P1). Thereafter, the pressed plated steel plate (10) can be transported to the cutting device via the transport device. The control unit can control the cutting device to cut the plated steel plate (10) along the imaginary center line (C) of the pair of pressing units (13).

[0145] However, the present invention is not limited thereto, and the plated steel sheet manufacturing device (20) may not be equipped with a control unit. In this case, the plated steel sheet manufacturing device (20) may press and process the plated steel sheet (10) by the operator's operation, and thereafter, the operator may cut the plated steel sheet (10) using a cutting device.

[0146] Referring again to FIG. 2, the plated steel sheet (10) that has been pressed by the plated steel sheet manufacturing device (20, 20A) according to Embodiment 1 or Embodiment 2 of the present invention may have a pressing portion (13) formed at the upper and lower portions of the plated steel sheet (10, 10A), respectively. At this time, as described above, the upper / lower pressing portions (13) may have the same or similar shape and size.

[0147] The width (L1) of the compression member (13) may be a size corresponding to the width (L2) of the pressurizing member (130, 230). Accordingly, the compression member (13) may be formed with a smaller width than the connecting member (120, 220). For example, when the compression member (130, 230) has a width (L2) of 0.5 mm to 8 mm, the compression member (13) formed using the same may also have a width (L1) within a range of 0.5 mm to 8 mm.

[0148] The protrusion distance (P2) of the pressing portion (130, 230) may be greater than the thickness (T2) of the plating layer (12a, 12b) and less than the total thickness (T1) of the plated steel sheet (10, 10A). As a pair of pressing portions (13) are formed by the pressing portions (130, 230), the thickness (T3) of the pressed plated steel sheet (10, 10A) may be processed to be, for example, 10 to 90% of the thickness (T1) before pressing.

[0149] Fig. 12 schematically illustrates a state of a plated steel sheet manufacturing apparatus according to another embodiment of the present invention before pressing a plated steel sheet. In addition, Fig. 13 schematically illustrates a state of the steel sheet processing apparatus of Fig. 11 pressing a plated steel sheet.

[0150] Referring to FIGS. 12 and 13, a plated steel sheet manufacturing device (20B) according to another embodiment of the present invention (hereinafter, Example 3) may include one compression unit (100) and a support member (300).

[0151] The support member (300) may be placed on the floor or inner wall of a building where the plated steel plate processing device (20B) is installed. The support member (300) may be fixedly installed at the above-mentioned location. The support member (300) may have a flat plane shape such that the upper surface thereof is parallel to the longitudinal direction of the plated steel plate (10B) or the longitudinal direction of the body (110). The plated steel plate (10B) may be supported on the upper surface of the support member (300).

[0152] The compression unit (100) may be positioned to face the support member (300) with the plated steel plate (10B) therebetween. At this time, the compression unit (100) may be able to be raised and lowered to approach or move away from the upper surface of the plated steel plate (10B). For example, during compression processing, the compression unit (100) may be lowered to pressurize the upper plating layer (12a) of the plated steel plate (10B) supported on the support member (300). As another example, the body (100) may be provided to be rotatable, so that the plated steel plate (10B) supported on the support member (300) may be compressed and processed by the pressurizing member (130) that rotates together with the body (100).

[0153] By performing compression processing in this manner, a compression portion (13) can be formed only at the upper end of the plated steel plate (10B). The specific features of the compression unit (100) and the pressurizing portion (130) provided therein are the same or similar to those described above, and therefore, a duplicate description will be omitted.

[0154] Referring again to FIG. 5B, the plated steel sheet (10B) that is pressed by the plated steel sheet manufacturing device (20B) according to Example 3 of the present invention may have a pressing portion (13) formed only at the upper end of the plated steel sheet (10B). At this time, the width (L1) of the pressing portion (13) may have a size corresponding to the width (L2) of the pressing portion (130, 230). In addition, the protrusion distance (P2) of the pressing portion (110) is larger than the thickness (T2) of the plated layer (12a, 12b) and smaller than the overall thickness (T1) of the plated steel sheet (10B), which is the same as the plated steel sheet (10) according to Example 1.

[0155] Meanwhile, the width (L1) and depth (P1) of the pressing portion (13) may vary based on the pressure applied to the plated steel sheet (10B). More specifically, as the applied pressure increases, both the width (L2) and depth (P2) of the pressing portion (13) formed on the plated steel sheet (10B) may increase in proportion thereto. On the other hand, the distance between a pair of opposing pressing portions (13), i.e., the thickness (T3) of the pressing-processed plated steel sheet (10B), may decrease in inverse proportion thereto as the applied pressure increases.

[0156] The plated steel sheet manufacturing device (20, 20A, 20B) may include a cutting device (not shown). The cutting device may cut a cutting target portion (CP) of the plated steel sheet (10, 10A, 10B) to adjust the length. For example, the cutting device may perform cutting processing by cutting the cutting target portion (CP) along a cutting direction using a cutting cutter (not shown). The cutting direction may be a direction parallel to the second direction (B2) or the vertical direction (Z) as described above. By such cutting processing, the plated steel sheet (10, 10A, 10B) may be divided into at least two or more pieces.

[0157] In the above case, when the pressing process of the plated steel sheet (10, 10A, 10B) is completed by the plated steel sheet manufacturing device (20, 20A, 20B), the pressing portion (13) can be cut in the vertical direction by a cutting device (not shown). At this time, in order to minimize the area of ​​the steel sheet (11) exposed to the outside, the position where the thickness of the pressing portion (13) is minimum [e.g., the center (C) of the pressing portion (13)] can be cut. The cut plated steel sheet (10, 10A, 10B) can be used in various manufacturing processes.

[0158] Referring again to FIGS. 6 to 11, a method for manufacturing a plated steel sheet (10, 10A, 10B) according to embodiments of the present invention using a plated steel sheet manufacturing apparatus (20, 20A, 20B) may be as follows. Hereinafter, for convenience of explanation, the plated steel sheet manufacturing apparatus (20) and the plated steel sheet (10) according to Example 1 will be described.

[0159] First, a plated steel sheet (10) can be supplied to a plated steel sheet manufacturing device (20). At this time, the supplied plated steel sheet (10) may have a shape in which the upper and lower surfaces are flat and the overall thickness (T1) is the same or similar. That is, the plated steel sheet (10) before the start of processing may have a shape that includes only the first plated steel sheet area (A10). This plated steel sheet (10) may be in a coiled state before being supplied to the manufacturing device (20). When the manufacturing process starts, one end of the coiled plated steel sheet (10) may be unwound and supplied between the pressing units (100, 200).

[0160] Next, a pressing process can be performed to form a pressing portion (13) on the plated steel plate (10). At this time, the pressing portions (130, 230) that are rotationally driven by the body (110, 210) can press the upper and lower surfaces of the plated steel plate (10). The supply time of the plated steel plate (10) can be after the pressing units (100, 200) start to rotate, or at the same time as the rotation starts.

[0161] More specifically, as the plated steel sheet (10) passes between the rotating pressurizing parts (130, 230), a first pressing part (13a) may be formed at the upper end of the plated steel sheet (10), and a second pressing part (13b) may be formed at the lower end of the plated steel sheet (10). At this time, the first pressing part (13a) and the second pressing part (13b) may be formed at positions facing each other along the second direction (B2). By this pressing process, the plated steel sheet (10) may have a first plated steel sheet region (A10) and a second plated steel sheet region (A20) formed to be continuous with each other along the width direction (first direction) (B1). At this time, the second plated steel sheet region (A20) may not have a cut part (14) formed therein.

[0162] Meanwhile, in the pressing process step, the pressure (pressure) applied to the plated steel sheet (10) by the pressing unit (100, 200) can be adjusted according to the shape of the plated steel sheet (10) to be manufactured. The pressing pressure can be adjusted, for example, within the range of 5 kg / cm2 to 300 kg / cm2, but is not limited thereto. Based on the pressing pressure, the width (L1) and the pressing depth (P1) of the pressing portion (13) can be changed. For example, when the pressure applied to the plated steel sheet (10) increases or decreases, the width (L1) of the pressing portion (13) [or the width of the second plated steel sheet region] and the pressing depth (P1) can increase or decrease in proportion thereto.

[0163] In addition, since the thickness (T3) of the cut portion (14) formed through the cutting processing step described later is determined by the thickness of the second plated steel plate area (A20), the thickness (T3) of the cut portion (14) can also be changed based on the pressing pressure. For example, when the applied pressing pressure increases or decreases, the thickness (T3) of the cut portion (14) can decrease or increase in inverse proportion thereto. Accordingly, the area of ​​the second steel plate area (A21) exposed to the outside through the cut portion (14) can be determined.

[0164] Next, after the pressing process is completed, a cutting process can be performed to form a cut portion (14) in the plated steel plate (10). In the cutting process step, a cutting cutter (not shown) can be used to simultaneously cut the first pressing portion (13a) and the second pressing portion (13b) that are arranged to face each other. At this time, the cutting cutter can cut the second plated steel plate area (A20) along a direction parallel to the thickness direction (second direction) (B2) of the plated steel plate (10) while passing through the common center (C) of the pressing portions (13a, 13b). As a result, a cut portion (14) can be formed at the second end (E2) of the second plated steel plate area (A20).

[0165] Meanwhile, in the cutting processing step, as the second plating area (A20) is cut by the cutting cutter, a part of the plating material included in the second plating area (A20) may move onto the cut portion (14), thereby forming a third plating area (A30). This third plating area (A30) may have a shape extending along the second direction (B2), thereby at least partially covering the cut portion (14).

[0166] Alternatively, during the first cut, there is no plating material on the cut portion (14), but some of the plating material of the second plating area (A20) may move onto the cut portion (14) due to the sacrificial method, thereby forming a third plating area (A30).

[0167] Afterwards, the plated steel plate (10) that has undergone the cutting process can be transported for subsequent processes or manufacturing operations depending on its intended use.

[0168] The plated steel sheets (10, 10A, 10B) according to the embodiments of the present invention as described above can minimize the area of ​​the steel sheet (11) exposed to the outside by cutting by reducing the thickness by pressing the cutting target location and then cutting the pressed portion. As a result, by delaying the time for rust to occur in the cut portion, the plated steel sheets (10, 10A, 10B) can have improved corrosion resistance even after cutting.

[0169] In addition, since the pressing portion (13) is formed in an inwardly curved shape in the plated steel sheet (10, 10A, 10B) during the pressing process, the plating layer (12) can be prevented from being damaged or peeled off during the pressing process, compared to the case of pressing using a conventional sharp-shaped structure. In addition, by applying pressure using a pressing portion (130, 230) having a curved shape corresponding to the pressing portion (13) during the pressing process, a portion where the thickness and plating amount rapidly decrease in the pressing portion (13) does not occur, so that the corrosion resistance of the plated steel sheet (10, 10A, 10B) can be further improved.

[0170] Fig. 14a illustrates a galvanized steel sheet before cutting. Fig. 14b illustrates a galvanized steel sheet in which a cut portion has been formed by cutting. Fig. 15 schematically illustrates a state of a galvanized steel sheet according to the present invention after cutting is completed but before pressing is initiated. In addition, Fig. 16 is an enlarged cross-sectional view of a galvanized steel sheet and a portion thereof manufactured after cutting and pressing are completed.

[0171] Referring to FIGS. 14A to 16, a method for manufacturing a plated steel sheet (10, 10A, 10B) according to another embodiment of the present invention (hereinafter, a plated steel sheet manufacturing method) may be as follows. Such a plated steel sheet manufacturing method may be performed using a plated steel sheet manufacturing apparatus (20, 20A, 20B). Hereinafter, for convenience of explanation, the plated steel sheet manufacturing apparatus (20) and the plated steel sheet (10) according to Example 1 will be described.

[0172] First, a plated steel sheet (10) can be supplied to a plated steel sheet manufacturing device (20). At this time, the specific method of supplying the plated steel sheet (10) is the same or similar to that described above, so a duplicate description is omitted.

[0173] Next, a cutting processing step for forming a cut portion (14) in the plated steel plate (10) can be performed by a cutting device. In the cutting processing step, a portion (i.e., a cutting target portion) (CP) of the plated steel plate (10) can be cut using a cutting cutter (not shown). At this time, the cutting cutter can cut the cutting target portion (CP) along a direction parallel to the thickness direction (second direction) (B2) of the plated steel plate (10).

[0174] By this, a plurality of plated steel sheets (10) with adjusted (reduced) lengths can be manufactured by forming a cut portion (14). In the cutting processing step, at least one cutting target portion (CP) of the plated steel sheet (10) is cut by a cutting device, so that at least two cut portions (14) can be formed. For example, two or three or more cut portions (14) can be formed.

[0175] Meanwhile, in the cutting processing step, as the plated steel sheet (10) is cut by the cutting cutter, a portion of the plated material included in the second plated area (A20) may move onto the cut portion (14). As a result, a third plated area (A30) may be formed on the plated steel sheet (10). This third plated area (A30) may have a shape extending along the second direction (B2), thereby at least partially covering the cut portion (14).

[0176] Alternatively, during the first cut, there is no plating material on the cut portion (14), but some of the plating material of the second plating area (A20) may move onto the cut portion (14) due to the sacrificial method, thereby forming a third plating area (A30).

[0177] Next, a pressing processing step may be performed to form a pressing portion (13) on the plated steel plate (10). After the cutting processing step, the plated steel plate (10) on which the cutting portion (14) is formed may pass between the rotating pressing portions (130, 230). In this process, the pressing portions (130, 230) that are rotationally driven by the body (110, 210) may press the upper and lower surfaces of the plated steel plate (10). The pressing portions (130, 230) may press the pressing target portion (PP) of the plated steel plate (10).

[0178] The pressing target portion (PP) may be a portion of the upper and lower surfaces of the plated steel sheet (10), and may be an area including a cut portion (140). More specifically, two pressing targets (PP) may be present as a set, one on the upper and one on the lower surface of the plated steel sheet (10). The two pressing targets (PP) may be arranged to face each other along the thickness direction (second direction) (B2) of the plated steel sheet (10). At this time, the cut portion (14) may be located at the common center (C) of the two pressing targets (PP).

[0179] By pressing two pressing portions (PP) like this by the pressing portions (130, 230), a pressing portion (13) can be formed on the plated steel plate (10). More specifically, an upper pressing portion (13A) can be formed on the upper end of the plated steel plate (10), and a lower pressing portion (13B) can be formed on the lower end of the plated steel plate (10). The upper pressing portion (13A) and the lower pressing portion (13B) can be formed to face each other along the second direction (B2) as they are formed on the pressing portion (PP). At this time, the upper pressing portion (13A) and the lower pressing portion (13B) facing each other can be cut by a cutting portion (14) passing through the center (C) thereof. That is, the upper compression member (13A) may include two first compression members (13a) that are mutually cut, and the lower compression member (13B) may include two second compression members (13b) that are mutually cut.

[0180] In addition, the pressing target portions (PP) may be provided in a plurality of sets corresponding to the number of cut portions (14). The sets of the plurality of pressing target portions (PP) may be positioned to be spaced apart at a predetermined interval along the longitudinal direction (B1) of the plated steel sheet (10). Here, the predetermined interval may correspond to the interval at which the plurality of cut portions (14) are spaced apart from each other. In this case, the sets of the plurality of pressing target portions (PP) may be simultaneously pressed by the rotating pressing portions (130, 230). Accordingly, a plurality of upper pressing portions (13A) may be formed on the upper surface of the plated steel sheet (10), and a plurality of lower pressing portions (13B) may be formed on the lower surface of the plated steel sheet (10) to face the upper pressing portions (13A) one-to-one. As described above, each of these multiple upper compression parts (13A) and multiple lower compression parts (13B) is cut by the cutting part (14).

[0181] By this pressing processing step, the first plated steel sheet region (A10) and the second plated steel sheet region (A20) can be formed in the plated steel sheet (10) so as to be continuous with each other along the width direction (first direction) (B1). Meanwhile, in the pressing processing step, the plated steel sheet (10) on which the cut portion (140) is formed can be supplied between the pressing units (100, 200) after the pressing units (100, 200) start to rotate, or can be supplied simultaneously with the pressing units (100, 200) starting to rotate.

[0182] In addition, in the pressing process step, the pressure (pressure) applied to the plated steel sheet (10) by the pressing unit (100, 200) can be adjusted according to the shape of the plated steel sheet (10) to be manufactured. The pressing pressure can be adjusted, for example, within a range of 5 kg / cm2 to 300 kg / cm2, but is not limited thereto. Based on the pressing pressure, the width (L1) and the pressing depth (P1) of the pressing portion (13) can be changed. For example, when the pressure applied to the plated steel sheet (10) increases or decreases, the width (L1) of the pressing portion (13) (or the width of the second plated steel sheet region) and the pressing depth (P1) can increase or decrease in proportion thereto.

[0183] In addition, since the thickness (T3) of the cut portion (14) is determined by the thickness of the second plated steel plate area (A20), the thickness (T3) of the cut portion (14) can also be changed based on the pressing pressure. For example, when the applied pressing pressure increases or decreases, the thickness (T3) of the cut portion (14) can decrease or increase in inverse proportion. Accordingly, the area of ​​the second steel plate area (A21) exposed to the outside through the cut portion (14) can be determined.

[0184] By sequentially performing the cutting processing step and the pressing processing step described above, a plated steel sheet (10) including a first plated steel sheet region (A10) and a second plated steel sheet region (A20) including a pressing portion (13) and a cutting portion (14) can be manufactured. The plated steel sheet (10) manufactured in this manner can be transported for subsequent processes or manufacturing operations depending on its intended use.

[0185] The plated steel sheets (10, 10A, 10B) according to the embodiments of the present invention as described above are manufactured in a manner of reducing the thickness by performing a pressing process on a pressing target portion (PP) including the cutting target portion (CP) after cutting processing on the cutting target portion (CP), which is the cutting target location, thereby minimizing the area of ​​the steel sheet (11) exposed to the outside by the cutting process. As a result, by delaying the time for rust to occur in the cut portion, the plated steel sheets (10, 10A, 10B) can have improved corrosion resistance even after cutting.

[0186] In addition, since the pressing portion (13) is formed in an inwardly curved shape in the plated steel sheet (10, 10A, 10B) during the pressing process, the plating layer (12) can be prevented from being damaged or peeled off during the pressing process, compared to the case of pressing using a conventional sharp-shaped structure. In addition, by applying pressure using a pressing portion (130, 230) having a curved shape corresponding to the pressing portion (13) during the pressing process, a portion where the thickness and plating amount rapidly decrease in the pressing portion (13) does not occur, so that the corrosion resistance of the plated steel sheet (10, 10A, 10B) can be further improved.

[0187] The plated steel sheets (10, 10A, 10B) according to the embodiments of the present invention as described above can minimize the area of ​​the steel sheet (11) exposed to the outside despite the cutting process by reducing the thickness by pressing the cutting target position before or after the cutting process. As a result, by delaying the time for rust to occur in the cut portion, the plated steel sheets (10, 10A, 10B) can have improved corrosion resistance even after being cut.

[0188] In addition, since the pressing portion (13) is formed in an inwardly curved shape in the plated steel sheet (10, 10A, 10B) during the pressing process, the plating layer (12) can be prevented from being damaged or peeled off during the pressing process, compared to the case of pressing using a conventional sharp-shaped structure. In addition, by applying pressure using a pressing portion (130, 230) having a curved shape corresponding to the pressing portion (13) during the pressing process, a portion where the thickness and plating amount rapidly decrease in the pressing portion (13) does not occur, so that the corrosion resistance of the plated steel sheet (10, 10A, 10B) can be further improved.

[0189] Although the embodiments of the present invention have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics thereof. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

[0190] The present invention can be applied to an industrially usable plated steel sheet, and a manufacturing apparatus and manufacturing method thereof.

Claims

1. A first plated steel plate region extending in a first direction and including a first steel plate region and a first plating region; and A second plated steel plate region extending in the first direction and including a second steel plate region and a second plated steel plate region; The above second plated steel plate area is, A first end continuous with the first plated steel plate area; A second end formed in the opposite direction to the first end; A pressing portion pressed inwardly along the second direction at the upper or lower surface of the second plating area by the pressing depth; and A cut portion is disposed at the second end of the second plated steel plate region and extends along the second direction; A plated steel sheet, wherein the width of the second plated steel sheet region is greater than the pressing depth.

2. In paragraph 1, The above-mentioned pressing section is a plated steel sheet, wherein the pressing depth changes along the first direction.

3. In paragraph 2, A plated steel sheet, wherein the pressing depth increases from the first end of the second plated steel sheet region to the second end along the first direction.

4. In paragraph 1, The above-mentioned pressing portion is a plated steel sheet having a shape that is curved toward the inside of the second plated steel sheet region.

5. In paragraph 4, A plated steel sheet, wherein the inclination of the tangent line changes along the first direction between the first end and the second end of the second plated steel sheet region.

6. In paragraph 5, A plated steel sheet, wherein the average slope of the tangent between the center of the first end and the second end of the second plated steel sheet region and the second end is 45° or less.

7. In paragraph 4, A plated steel sheet, wherein the compression member has a minimum radius of curvature at a second end of the second plated steel sheet region and a maximum radius of curvature at a first end of the second plated steel sheet region.

8. In paragraph 7, Galvanized steel sheet having a minimum radius of curvature of 0.25 mm.

9. In paragraph 1, A plated steel sheet, wherein the thickness of the second plated steel sheet region is 10% to 90% of the thickness of the first plated steel sheet region.

10. In paragraph 1, The above second plating area is, A plated steel sheet having a first thickness at the first end of the second plated steel sheet region, and a second thickness that is less than or equal to the first thickness at the second end of the second plated steel sheet region.

11. In paragraph 1, A plated steel sheet further comprising a third plated region extending along the second direction and at least partially covering the cut portion.

12. In paragraph 11, A plated steel sheet, wherein the third plated area has a smaller thickness than the second plated area.

13. In paragraph 11, A plated steel sheet, wherein the third plating area has a smaller plating amount than the second plating area.

14. In paragraph 1, A plated steel sheet, wherein the second plated area has a greater density than the first plated area.

15. In paragraph 1, A plated steel sheet, wherein the second steel plate region has a higher density than the first steel plate region.

16. In paragraph 1, A plated steel sheet having a width of the above-mentioned compression member of 0.25 mm to 4 mm.

17. In paragraph 1, The above second plated steel plate area is, A plated steel sheet comprising a first pressing portion that is concave downwardly on the upper surface of the second plating region, and a second pressing portion that is concave upwardly on the lower surface of the second plating region and is positioned so as to face the first pressing portion.

18. A step of supplying a plated steel sheet including a first plated steel sheet area including a first plated area and a first steel sheet area; A step of pressing the above-mentioned plated steel plate to form a second plated steel plate region extending in the first direction and including a second plated region and a second steel plate region; and A method for manufacturing a plated steel sheet, comprising: forming a cut portion extending along a second direction in the second plated steel sheet region.

19. In paragraph 18, In the step of forming the second plated steel plate area, A method for manufacturing a plated steel sheet, wherein a pressing portion is formed inwardly of the second plating region along the second direction, but has a width greater than the pressing depth.

20. In paragraph 19, A method for manufacturing a plated steel sheet, wherein the pressing pressure applied to the second plating area is 5 kg / cm2 to 300 kg / cm2.

21. In paragraph 20, In the step of forming the above cut portion, A method for manufacturing a plated steel sheet, wherein the cut portion is formed so as to pass through the center of the pressing portion.

22. In paragraph 20, In the step of forming the above cut portion, A method for manufacturing a plated steel sheet, wherein a third plated region is further formed, extending along the second direction and at least partially covering the cut portion.

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