METHOD FOR PRODUCING TEXTURED PLATED STEEL SHEET AND APPARATUS FOR PRODUCING TEXTURED PLATED STEEL SHEET

Abstract

Provided are a production method for a textured plated steel sheet and a production device for a textured plated steel sheet that make it possible to suppress product defects resulting from the film thickness deficiency and poor appearance of a plating layer. This production method for a textured plated steel sheet comprises a plating layer formation step for forming a plating layer on the surface of a steel sheet by electroplating or hot dip plating and thereby producing a plated steel sheet, a grinding step for grinding the surface of the plating layer of the plated steel sheet and thereby forming a texture on the surface of the plating layer, a plating film thickness determination step for determining first plating film thickness information about the film thickness of the plating layer of the plated steel sheet after the plating layer formation step but before the grinding step and second plating film thickness information about the film thickness of the plating layer of the plated steel sheet after the grinding step, and an adjustment step for adjusting the plating amount of the plating layer formed during the plating layer formation step and the amount the surface of the plating layer is ground during the grinding step on the basis of the first and second plating film thickness information.

Description

[Technical field]

[0001] The present disclosure relates to a method for producing textured plated steel sheet and an apparatus for producing textured plated steel sheet. [Background technology]

[0002] Articles such as electrical equipment, building materials, and automobiles are sometimes required to have corrosion resistance and design. Textured plated steel sheets have been considered as materials suitable for such applications. Textured plated steel sheets have a plating layer on the surface of which a texture, typically a hairline, is formed.

[0003] Methods for producing textured plated steel sheets are proposed, for example, in JP 2006-124824 A (Patent Document 1) and WO 2008 / 054419 A (Patent Document 2).

[0004] In Patent Document 1, a zinc plating layer is formed on the surface of a steel sheet, and the surface of the zinc plating layer is ground using a belt sander (abrasive belt) of about #60 to #320, thereby forming a hairline on the surface of the zinc plating layer.

[0005] Patent Document 2 proposes a method for polishing a metal alloy plated steel sheet product. The polishing method disclosed in Patent Document 2 is a method for polishing a metal alloy plated steel sheet product to form a polished plated surface having a continuous, consistent stainless steel-like appearance, and is characterized by comprising the steps of: a) providing a metal alloy plated steel sheet product having a minimized spangle plating film; b) embossing the minimized spangle plating film to form an intermediate metal alloy plated steel sheet product having a textured pattern embossed plating film that, when polished, gives the continuous, consistent stainless steel-like appearance; and c) polishing the textured pattern embossed plating film to form the continuous, consistent stainless steel-like appearance. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2006-124824 A [Patent Document 2] International Publication No. 2008 / 054419 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when a textured plated steel sheet is manufactured by grinding the surface of the plating layer, the thickness of the plating layer may be insufficient, or the texture may not be sufficiently formed, resulting in poor appearance, and thus product defects may occur. It would be preferable if the cause of the product defect could be identified quickly. If the cause of the product defect could be identified quickly and eliminated, the product defect could be suppressed.

[0008] However, product defects are not considered in the manufacturing methods of textured plated steel sheets disclosed in the above-mentioned Patent Documents 1 and 2. Therefore, when manufacturing textured plated steel sheets by the methods disclosed in the above-mentioned Patent Documents 1 and 2, product defects may not be suppressed in some cases.

[0009] An object of the present disclosure is to provide a manufacturing method for textured plated steel sheet that can suppress product defects due to insufficient plating layer thickness and poor appearance, and a manufacturing apparatus for textured plated steel sheet that can easily identify the causes of product defects due to insufficient plating layer thickness and poor appearance. [Means for solving the problem]

[0010] The method for producing a textured plated steel sheet according to the present disclosure includes: a plating layer forming step of forming a plating layer on a surface of a steel sheet by an electroplating method or a hot-dip plating method to manufacture a plated steel sheet; a grinding step of grinding a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a plating thickness determination process for determining first plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the plating layer forming process and before the grinding process, and second plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the grinding process; The method further includes an adjustment process for adjusting the plating amount of the plating layer formed in the plating layer forming process and the grinding amount of the surface of the plating layer ground in the grinding process based on the first and second plating film thickness information.

[0011] The manufacturing apparatus for textured plated steel sheet according to the present disclosure comprises: A plating apparatus for producing a plated steel sheet by performing hot-dip plating or electroplating to form a plating layer on a surface of the steel sheet; a grinding device disposed downstream of the plating device and configured to grind a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a first plating thickness determination device that determines first plating thickness information regarding a thickness of the plating layer before the grinding and outputs the first plating thickness information; and a second plating thickness determination device disposed downstream of the grinding device, which determines second plating thickness information regarding a thickness of the ground plating layer, and outputs the second plating thickness information. Effect of the Invention

[0012] The method for producing a textured plated steel sheet according to the present disclosure can suppress product defects due to insufficient thickness of the plating layer and poor appearance. The manufacturing device for a textured plated steel sheet according to the present disclosure can easily identify the cause of product defects due to insufficient thickness of the plating layer and poor appearance. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an overall view of a manufacturing apparatus for a textured plated steel sheet according to the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a schematic configuration of an example of an electrolytic zinc plating apparatus. [Diagram 3] FIG. 3 is a side view showing a schematic configuration of an example of a hot-dip galvanizing apparatus. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic configuration of an example of a grinding device. [Diagram 5] FIG. 5 is an overall view of a manufacturing apparatus for a textured plated steel sheet including a control device according to the second embodiment. [Figure 6] FIG. 6 is a functional block diagram of the control device. [Figure 7] FIG. 7 is a functional block diagram illustrating an example of a hardware configuration of the control device. [Figure 8] FIG. 8 is an operation flow diagram of a manufacturing apparatus for textured plated steel sheet equipped with a control device. [Figure 9] FIG. 9 is an operational flow diagram of the manufacturing apparatus for a textured plated steel sheet equipped with a control device when the second plating film thickness information is outside the reference range. [Figure 10] FIG. 10 is an operational flow diagram of the manufacturing apparatus for a textured plated steel sheet equipped with a control device when the second plating film thickness information is below the reference range. [Figure 11] FIG. 11 is an operational flow diagram of the manufacturing apparatus for a textured plated steel sheet equipped with a control device when the second plating film thickness information is within a reference range. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The method for producing a textured plated steel sheet includes, for example, a plating layer forming step and a grinding step after the plating layer forming step. In the plating layer forming step, a plating layer is formed on the surface of a steel sheet to produce a plated steel sheet. The grinding step is carried out after the plating layer forming step. In the grinding step, for example, the surface of the plating layer of the plated steel sheet is ground to form a texture on the surface of the plating layer.

[0015] Here, the texture is a pattern formed by the unevenness of the surface of the plating layer. Examples of the texture include hairlines and vibrations. Hairlines are a pattern formed by a large number of fine linear grooves. Vibrations are a pattern formed by a large number of fine arc-shaped grooves.

[0016] The plating layer of the textured plated steel sheet is formed on the surface of the steel sheet and then ground, i.e., the textured plated steel sheet is provided with a plating layer having a final thickness after it has been formed and ground.

[0017] The plating layer of the textured plated steel sheet enhances the corrosion resistance of the textured plated steel sheet. If the final thickness of the plating layer is less than a certain value, i.e., if the final thickness is insufficient, the corrosion resistance of the textured plated steel sheet is reduced. Therefore, if the final thickness of the plating layer is less than a certain value, the product is defective.

[0018] On the other hand, if the plating layer is sufficiently ground in the grinding process, the texture is sufficiently formed. In this case, the design of the textured plated steel sheet is improved. The present inventors considered that if the plating layer is sufficiently ground, the final film thickness of the plating layer will be equal to or less than a certain value.

[0019] The present inventors considered that the final film thickness of the plating layer can be used as an index showing the corrosion resistance and designability of a textured plated steel sheet, and that if the final film thickness of the plating layer is within a standard range, the textured plated steel sheet can be determined to have excellent corrosion resistance and designability.

[0020] Therefore, the inventors set a standard range for the final film thickness of the plating layer of a textured plated steel sheet, and thought that if the operating conditions were adjusted based on the final film thickness of the plating layer, it would be possible to suppress insufficient final film thickness of the plating layer and product defects due to poor appearance.

[0021] However, there have been cases where the insufficient final thickness of the plating layer and the defective product due to the poor appearance of the plating layer of the textured plated steel sheet cannot be suppressed by simply adjusting the operating conditions based on the final thickness of the plating layer. The present inventors have investigated the cause of this and have obtained the following findings.

[0022] For example, assume that the final thickness of the plating layer is insufficient. Even if the amount of plating of the plating layer formed in the plating layer forming process is increased in order to increase the final thickness of the plating layer, the final thickness of the plating layer may be below the standard range. This is the case when the amount of grinding of the plating layer ground in the grinding process is too large. On the other hand, if the amount of grinding of the plating layer ground in the grinding process is reduced in order to increase the final thickness of the plating layer, the texture may not be formed sufficiently, resulting in a defective appearance. This is the case when the amount of plating of the plating layer formed in the plating layer forming process is too small. In this case, it is necessary to increase the amount of grinding of the plating layer ground in the grinding process and at the same time increase the amount of plating of the plating layer formed in the plating layer forming process.

[0023] For example, assume that the texture is not sufficiently formed, resulting in poor appearance. If the amount of the plating layer ground in the grinding process is increased in order to form a sufficient texture, the final film thickness of the plating layer may fall below the standard range. This is the case when the amount of plating of the plating layer formed in the plating layer forming process is too small. In this case, it is necessary to increase the amount of plating of the plating layer ground in the grinding process and at the same time increase the amount of plating of the plating layer formed in the plating layer forming process.

[0024] From the above study, it was found that the final film thickness of the plating layer cannot be used as an index of the corrosion resistance and design of a textured plated steel sheet. From the above study, it was found that the final film thickness and appearance of the plating layer are influenced by two factors: (1) the plating amount of the plating layer formed in the plating layer formation process, and (2) the grinding amount of the plating layer ground in the grinding process. The inventors found that by simply measuring the final film thickness of the plating layer, it is not possible to determine whether (1) and / or (2) are the factors causing the insufficient final film thickness of the plating layer and / or the product defect due to the poor appearance.

[0025] The present inventors have therefore considered a method for solving this problem. Here, information on the thickness of the plating layer of the plated steel sheet after the plating layer forming step and before the grinding step is referred to as first plating film thickness information. Information on the thickness of the plating layer of the plated steel sheet after the grinding step is referred to as second plating film thickness information. The present inventors have considered that if both the second plating film thickness information on the plating film thickness after grinding and the first plating film thickness information on the plating film thickness before grinding are obtained, the cause of the insufficient final film thickness of the plating layer and / or the product defect due to the appearance defect can be quickly identified. Then, they have considered that if the operating conditions are adjusted based on both the first and second plating film thickness information, the corrosion resistance deterioration due to the insufficient final film thickness of the plating layer of the textured plated steel sheet and the product defect due to the appearance defect can be suppressed.

[0026] The present inventors further studied a manufacturing apparatus that can easily identify the cause of a product defect based on an insufficient final film thickness of the plating layer of the textured plated steel sheet and a defective appearance. The manufacturing apparatus for the textured plated steel sheet used in the above-mentioned manufacturing method for the textured plated steel sheet includes, for example, a plating apparatus and a grinding apparatus. The plating apparatus manufactures the plated steel sheet by forming a plating layer on the surface of the steel sheet. The grinding apparatus is disposed downstream of the plating apparatus and grinds the surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer. The present inventors considered that the manufacturing apparatus for the textured plated steel sheet should further include a first plating film thickness determination apparatus and a second plating film thickness determination apparatus. The first plating film thickness determination apparatus determines first plating film thickness information related to the film thickness of the plating layer before grinding, and outputs the first plating film thickness information. The second plating film thickness determination apparatus is disposed downstream of the grinding apparatus and determines second plating film thickness information related to the film thickness of the ground plating layer, and outputs the second plating film thickness information. With a manufacturing apparatus for textured plated steel sheet having the above-described configuration, it is believed that it is easy to determine whether a product defect is caused by (1) the plating amount of the plating layer formed in the plating layer formation process and / or (2) the grinding amount of the plating layer ground in the grinding process.

[0027] The method for producing a textured plated steel sheet according to the present embodiment, which has been completed based on the above findings, has the following configuration.

[0028] [1] a plating layer forming step of forming a plating layer on a surface of a steel sheet by an electroplating method or a hot-dip plating method to manufacture a plated steel sheet; a grinding step of grinding a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a plating thickness determination process for determining first plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the plating layer forming process and before the grinding process, and second plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the grinding process; and adjusting a plating amount of the plating layer formed in the plating layer forming step and a grinding amount of the surface of the plating layer ground in the grinding step based on the first and second plating film thickness information. A method for producing textured galvanized steel sheet.

[0029] [2] A method for producing a textured plated steel sheet according to the present invention, comprising the steps of: In the adjusting step, determining grinding amount information, which is information regarding the grinding amount in the grinding step, based on the first plating film thickness information and the second plating film thickness information; adjusting the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step based on the second plating film thickness information and the grinding amount information. A method for producing textured galvanized steel sheet.

[0030] [3] A method for producing a textured plated steel sheet according to [2], In the adjusting step, When the second plating film thickness information is greater than a reference range and the grinding amount information is greater than a reference range, adjusting the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step to be reduced; When the second plating film thickness information is greater than a reference range and the grinding amount information is less than a reference range, adjusting so as to maintain the plating amount of the plating layer formed in the plating layer forming step and increase the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is greater than a reference range and the grinding amount information is within a reference range, the plating amount of the plating layer formed in the plating layer forming step is reduced, and the grinding amount of the surface of the plating layer ground in the grinding step is adjusted to be maintained; When the second plating film thickness information is less than a reference range and the grinding amount information is greater than a reference range, adjusting so as to maintain the plating amount of the plating layer formed in the plating layer forming step and reduce the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is less than a reference range and the grinding amount information is less than a reference range, adjusting so as to increase the plating amount of the plating layer formed in the plating layer forming step and to increase the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is less than a reference range and the grinding amount information is within a reference range, the plating amount of the plating layer formed in the plating layer forming step is increased, and the grinding amount of the surface of the plating layer ground in the grinding step is adjusted to be maintained; When the second plating film thickness information is within a reference range and the grinding amount information is greater than a reference range, adjusting so as to maintain the plating amount of the plating layer formed in the plating layer forming step and reduce the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is within a reference range and the grinding amount information is less than a reference range, adjusting so as to maintain the plating amount of the plating layer formed in the plating layer forming step and increase the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is within a reference range and the grinding amount information is within a reference range, adjustment is made so as to maintain the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step. A method for producing textured galvanized steel sheet.

[0031] [4] A method for producing a textured plated steel sheet according to any one of [1] to [3], In the plating thickness determination step, measuring a thickness of the plating layer of the plated steel sheet after the plating layer forming step and before the grinding step, and setting the measured thickness as the first plating thickness information. A method for producing textured galvanized steel sheet.

[0032] [5] A method for producing a textured plated steel sheet according to any one of [1] to [4], In the plating thickness determination step, measuring a thickness of the plating layer of the plated steel sheet after the grinding process, and setting the measured thickness as the second plating thickness information. A method for producing textured galvanized steel sheet.

[0033] [6] A method for producing a textured plated steel sheet according to any one of [1] to [5], In the plating layer forming step, the plating layer is formed by the electroplating method, In the plating thickness determination step, determining the first plating film thickness information based on a metal ion concentration in a plating solution, a sheet passing speed of the steel sheet through the plating solution, a width direction length of the steel sheet, a current density, a current efficiency, and / or a temperature of the plating solution in the plating layer forming step; A method for producing textured galvanized steel sheet.

[0034] [7] A method for producing a textured plated steel sheet according to any one of [1] to [5], In the plating layer forming step, the plating layer is formed by the hot-dip plating method, In the plating thickness determination step, determining the first coating thickness information based on a passing speed of the steel sheet through a coating bath, a collision pressure of a wiping gas, and / or a rolling reduction rate in a skin pass mill in the coating layer forming step; A method for producing textured galvanized steel sheet.

[0035] [8] The method for producing a textured plated steel sheet according to any one of [1] to [7], further comprising: A coating film forming step of forming a coating film on the surface of the plated steel sheet after the grinding step is included. A method for producing textured galvanized steel sheet.

[0036] [9] The method for producing a textured plated steel sheet according to any one of [1] to [8], further comprising: An appearance evaluation step is provided in which the appearance of the plated steel sheet after the grinding step is evaluated based on the glossiness of the surface of the plated steel sheet after the grinding step. A method for producing textured galvanized steel sheet.

[0037]

[10] A method for producing a textured plated steel sheet according to [9], In the appearance evaluation step, evaluating the appearance of the plated steel sheet based on two gloss levels, namely, a gloss level of the surface of the plated steel sheet measured in the longitudinal direction of the plated steel sheet and a gloss level of the surface of the plated steel sheet measured in the width direction of the plated steel sheet; A method for producing textured galvanized steel sheet.

[0038]

[11] A method for producing a textured plated steel sheet according to [9] or

[10] , In the adjusting step, adjusting a plating amount of the plating layer formed in the plating layer forming step and a grinding amount of the surface of the plating layer ground in the grinding step based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet after the grinding step; A method for producing textured galvanized steel sheet.

[0039]

[12] A plating apparatus for producing a plated steel sheet by performing hot-dip plating or electroplating to form a plating layer on a surface of the steel sheet; a grinding device disposed downstream of the plating device and configured to grind a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a first plating thickness determination device that determines first plating thickness information regarding a thickness of the plating layer before the grinding and outputs the first plating thickness information; and a second plating thickness determination device disposed downstream of the grinding device, determining second plating thickness information regarding a thickness of the ground plating layer, and outputting the second plating thickness information. Equipment for producing textured galvanized steel sheets.

[0040]

[13] The apparatus for producing a textured plated steel sheet according to

[12] , further comprising: a control device for controlling the plating device and the grinding device, The control device includes: controlling the plating device so as to adjust a plating amount of the plating layer formed on the surface of the steel sheet by the plating device based on the first plating film thickness information and the second plating film thickness information, and controlling the grinding device so as to adjust a grinding amount of the surface of the plating layer ground by the grinding device based on the first plating film thickness information and the second plating film thickness information. Equipment for producing textured galvanized steel sheets.

[0041]

[14]

[13] An apparatus for producing a textured plated steel sheet according to the present invention, The control device includes: determining grinding amount information, which is information regarding the grinding amount by the grinding device, based on the first plating film thickness information and the second plating film thickness information; controlling the plating device so as to adjust the plating amount of the plating layer formed on the surface of the steel sheet by the plating device based on the second plating film thickness information and the grinding amount information, and controlling the grinding device so as to adjust the grinding amount of the surface of the plating layer ground by the grinding device based on the second plating film thickness information and the grinding amount information. Equipment for producing textured galvanized steel sheets.

[0042]

[15]

[14] An apparatus for producing a textured plated steel sheet according to the present invention, The control device includes: When the second plating film thickness information is outside a reference range and the grinding amount information is outside a reference range, the plating device is controlled to reduce the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is greater than a reference range and the grinding amount information is less than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is greater than a reference range and the grinding amount information is within a reference range, the plating device is controlled to reduce the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to maintain the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is greater than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is less than a reference range, the plating device is controlled to increase the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is within a reference range, the plating device is controlled to increase the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to maintain the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is within a reference range and the grinding amount information is greater than the reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is within a reference range and the grinding amount information is less than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; when the second plating film thickness information is within a reference range and the grinding amount information is within a reference range, controlling the plating device to maintain the plating amount of the plating layer formed by the plating device, and controlling the grinding device to maintain the grinding amount of the surface of the plating layer ground by the grinding device. Equipment for producing textured galvanized steel sheets.

[0043]

[16] The apparatus for producing a textured plated steel sheet according to any one of

[12] to

[15] , further comprising: a coating film forming device disposed downstream of the grinding device and forming a coating film on the ground surface of the plating layer; Equipment for producing textured galvanized steel sheets.

[0044]

[17] The apparatus for producing a textured plated steel sheet according to any one of

[12] to

[16] , further comprising: one or more gloss meters arranged downstream of the grinding device and configured to measure the gloss of the surface of the plated steel sheet having the ground plating layer; Equipment for producing textured galvanized steel sheets.

[0045]

[18]

[17] An apparatus for producing a textured plated steel sheet according to the present invention, The gloss meter is a gloss meter that measures the gloss of the surface of the plated steel sheet in the longitudinal direction of the plated steel sheet, and a gloss meter that measures the gloss of the surface of the plated steel sheet in the width direction of the plated steel sheet. Equipment for producing textured galvanized steel sheets.

[0046]

[19]

[17] or

[18] , a manufacturing apparatus for a textured plated steel sheet, The control device includes: controlling the plating device to adjust the plating amount of the plating layer formed on the surface of the steel sheet by the plating device based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet, and controlling the grinding device to adjust the grinding amount of the surface of the plating layer ground by the grinding device based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet. Equipment for producing textured galvanized steel sheets.

[0047] Hereinafter, a method for producing a textured plated steel sheet and an apparatus for producing a textured plated steel sheet according to the present embodiment will be described. In the drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

[0048] [First embodiment] [About the manufacturing equipment for textured plated steel sheets] FIG. 1 is an overall view of a manufacturing apparatus for a textured plated steel sheet in the first embodiment. Referring to FIG. 1, the manufacturing apparatus 1 for a textured plated steel sheet includes a plating apparatus 2, a grinding apparatus 3, a first plating film thickness determination apparatus 4, and a second plating film thickness determination apparatus 5. The manufacturing apparatus 1 for a textured plated steel sheet in this embodiment is a continuous line type manufacturing apparatus. The plating apparatus 2 and the grinding apparatus 3 are arranged on the same continuous line. The grinding apparatus 3 is arranged downstream of the plating apparatus 2. The straight line in FIG. 1 is a straight line indicating the manufacturing line. The manufacturing apparatus 1 for a textured plated steel sheet in this embodiment includes an uncoiling apparatus and a winding apparatus (not shown). The uncoiling apparatus is arranged upstream of the plating apparatus 2 and rewinds the prepared steel sheet coil. The winding apparatus is arranged downstream of the grinding apparatus 3 and winds the manufactured textured plated steel sheet into a coil. Since the manufacturing apparatus 1 for a textured plated steel sheet is a continuous line type, the winding apparatus and the uncoiling apparatus are not arranged between the plating apparatus 2 and the grinding apparatus 3.

[0049] [About plating equipment] The plating apparatus 2 performs hot-dip plating or electroplating to form a plating layer on the surface of the steel sheet to manufacture a plated steel sheet. Hot-dip plating is, for example, selected from the group consisting of hot-dip galvanizing and hot-dip aluminum plating. Electroplating is, for example, selected from the group consisting of electrogalvanizing, electrocopper plating, and electronickel plating. The plating apparatus 2 is not particularly limited as long as it is a plating apparatus 2 that performs hot-dip plating or electroplating. Preferably, the plating apparatus 2 is a hot-dip galvanizing apparatus that performs hot-dip galvanizing, or an electrogalvanizing apparatus that performs electrogalvanizing. Hereinafter, as an example, a case where an electrogalvanizing apparatus is used and a case where a hot-dip galvanizing apparatus is used will be described.

[0050] [Electrolytic zinc plating equipment] FIG. 2 is a cross-sectional view showing a schematic configuration of an example of an electrogalvanizing apparatus 200. Referring to FIG. 2, the electrogalvanizing apparatus 200 includes a plurality of conductor rolls 201, a plurality of anodes 202, and a plurality of plating tanks 203. The conveying direction of the steel sheet 6 conveyed into the electrogalvanizing apparatus 200 is changed to a downward direction by the conductor rolls 201. The steel sheet 6 passes near the anode 202 and is continuously conveyed into the plating tank 203. A zinc plating solution is stored in the plating tank 203. The anode 202 is immersed in the zinc plating solution. The steel sheet 6 conveyed into the plating tank 203 is continuously immersed in the zinc plating solution. In the zinc plating solution, a current flows from the anode 202 to the steel sheet 6, with the steel sheet 6 serving as a cathode, so that a zinc plating layer is formed on the surface of the steel sheet 6. The conveying direction of the steel sheet 6 is changed from a downward direction to an upward direction by the conductor rolls 201 in the plating tank 203. A zinc-plated layer is further formed on the steel sheet 6 as it passes near the anode 202 in the plating tank 203. The steel sheet 6 on which the zinc-plated layer has been formed is continuously transported out of the plating tank 203. In FIG. 2, the electric zinc plating apparatus 200 includes a plurality of plating tanks 203. A zinc-plated layer is formed on the steel sheet 6 every time it passes through one of the plurality of plating tanks 203. In this way, plated steel sheets 7 are continuously manufactured.

[0051] The electrogalvanizing apparatus 200 of FIG. 2 includes a plurality of plating tanks 203. However, the number of plating tanks 203 may be one. In addition, in the electrogalvanizing apparatus 200 of FIG. 2, the plating tank 203 has an opening at the top. The steel sheet 6 is transported into the plating tank 203 through the opening at the top of the plating tank 203. The steel sheet 6 or the plated steel sheet 7 is discharged out of the plating tank 203 through the opening at the top of the plating tank 203. As described above, the plating tank 203 of FIG. 2 is a so-called vertical plating tank 203. However, the plating tank 203 may be a so-called horizontal plating tank 203 having one opening on each of two opposing sides. In the case of the horizontal plating tank 203, the steel sheet 6 is transported into the plating tank 203 through an opening on one side of the plating tank 203. The steel sheet 6 or the plated steel sheet 7 is discharged out of the plating tank 203 through an opening on the other side of the plating tank 203.

[0052] [Hot-dip galvanizing equipment] FIG. 3 is a side view showing a schematic configuration of an example of a hot-dip galvanizing apparatus 210. Referring to FIG. 3, the hot-dip galvanizing apparatus 210 includes a molten zinc pot 211, a sink roll 212, a support roll 213, a gas wiping device 214, a turndown roll 215, a top roll 216, a plurality of transport rolls 217, and a skin pass mill 218. A hot-dip galvanizing bath is stored in the molten zinc pot 211. The transport direction of the steel sheet 6 transported into the hot-dip galvanizing apparatus 210 is changed to a downward direction by the turndown roll 215. The steel sheet 6 is continuously immersed in the hot-dip galvanizing bath stored in the molten zinc pot 211. A sink roll 212 is disposed inside the molten zinc pot 211. The sink roll 212 is immersed in the hot-dip galvanizing bath. The sink roll 212 changes the transport direction of the steel sheet 6 from downward to upward. The support roll 213 is disposed in the hot-dip galvanizing bath and above the sink roll 212. The support roll 213 sandwiches the steel sheet 6 and supports the steel sheet 6 being transported upward.

[0053] The gas wiping device 214 is disposed above the liquid level of the hot-dip galvanizing bath. The gas wiping device 214 includes a pair of gas injection devices. The pair of gas injection devices have gas injection nozzles facing each other. The steel sheet 6 passes between the pair of gas injection nozzles of the gas wiping device 214. The pair of gas injection nozzles spray wiping gas onto the surface of the steel sheet 6 pulled up from the hot-dip galvanizing bath. This scrapes off a portion of the molten zinc adhering to the surface of the steel sheet 6. The steel sheet 7 from which a portion of the molten zinc on the surface has been scraped off is transported to the skin pass mill 218 by the top roll 216 and the transport roll 217.

[0054] In the hot-dip galvanizing apparatus 210 shown in FIG. 3, the skin pass mill 218 includes a pair of work rolls and a pair of backup rolls. The pair of work rolls includes an upper work roll 219 and a lower work roll 220. The pair of backup rolls includes an upper backup roll 221 and a lower backup roll 222. The steel sheet 6 is transported between the upper work roll 219 and the lower work roll 220 by the transport roll 217. The steel sheet 6 is pressed down while being sandwiched between the upper work roll 219 and the lower work roll 220. In this way, the plated steel sheet 7 is continuously manufactured. Although not shown, the hot-dip galvanizing apparatus 210 may further include an alloying furnace and a cooling furnace.

[0055] [About the grinding equipment] The grinding device 3 is disposed downstream of the plating device 2, and grinds the surface of the plating layer of the plated steel sheet 7 to form a texture on the surface of the plating layer. The texture includes, for example, a hairline and a vibration.

[0056] As an example, a case where a hairline is formed will be described. FIG. 4 is a cross-sectional view showing a schematic configuration of an example of the grinding device 3. Referring to FIG. 4, the grinding device 3 includes a plurality of conveying rolls 31, a pair of contact rolls 32, and a ring-shaped polishing belt 33. The pair of contact rolls 32 hold the ring-shaped polishing belt 33. The pair of contact rolls 32 rotate, so that the ring-shaped polishing belt 33 moves between the pair of contact rolls 32. The plated steel sheet 7 is conveyed by the conveying roll 31. The plated steel sheet 7 is conveyed between the conveying roll 31 and the ring-shaped polishing belt 33 by the conveying roll 31. The plated steel sheet 7 is pressed against the ring-shaped polishing belt 33 by one of the pair of contact rolls 32 and the conveying roll 31. The pair of contact rolls 32 rotate, so that the ring-shaped polishing belt 33 grinds the plating layer on the surface of the plated steel sheet 7. As a result, a texture is formed on the surface of the plating layer.

[0057] 4 is an abrasive belt type grinding device 3. However, the grinding device 3 is not limited to this. The grinding device 3 may include, for example, an abrasive brush.

[0058] [About the first plating thickness determination device] The first plating thickness determination device 4 determines first plating thickness information related to the thickness of the plating layer before grinding, and outputs the first plating thickness information. The first plating thickness determination device 4 may have a screen, and the first plating thickness information may be output to the screen.

[0059] The first plating film thickness information is information about the film thickness of the plating layer before grinding. The first plating film thickness information may be, for example, the film thickness (μm) of the plating layer before grinding, or the plating coverage (g / m 2), or may be the plating conditions in the plating apparatus 2. The plating conditions in the plating apparatus 2 are, for example, the metal ion concentration in the plating solution, the speed at which the steel sheet is passed through the plating solution, the width direction length of the steel sheet, the temperature of the plating solution, and / or the pH. When the plating apparatus 2 is a plating apparatus 2 that performs electroplating, the plating conditions may be the metal ion concentration in the plating solution, the speed at which the steel sheet is passed through the plating solution, the width direction length of the steel sheet, the current density, the current efficiency, and / or the temperature of the plating solution. When the plating apparatus 2 is a plating apparatus 2 that performs hot-dip plating, the plating conditions may be the speed at which the steel sheet is passed through the plating solution, the collision pressure of the wiping gas, and / or the reduction rate in the skin pass mill 218. In other words, the first plating film thickness information includes the plating film thickness before grinding and any information that can be used to estimate the plating film thickness before grinding.

[0060] The first plating thickness determination device 4 determines first plating thickness information relating to the thickness of the plating layer before grinding. The first plating thickness information may be determined by measurement. Specifically, the first plating thickness information is determined based on the thickness (μm) of the plating layer after it is formed by the plating device 2 and before it is ground by the grinding device 3, or the plating coverage (g / m 2 ) and the measured film thickness (μm) or plating coverage (g / m 2 ) may be determined as the first plating thickness information. In this case, the first plating thickness determination device 4 is, for example, a fluorescent X-ray film thickness meter. The first plating thickness information may be the plating conditions in the plating device 2. When the plating conditions are determined as the first plating thickness information, the first plating thickness determination device 4 may measure the plating conditions. In this case, the first plating thickness determination device 4 is, for example, a voltmeter, an ammeter, an ion meter, a thermometer, or a gas pressure meter.

[0061] Based on the plating conditions in the plating device 2, the film thickness (μm) of the plating layer before grinding or the plating adhesion weight (g / m 2The first plating thickness determination device 4 may measure the plating conditions, and determine the thickness (μm) of the plating layer before grinding or the plating coating weight (g / m 2 ) and outputs it. For example, the first plating film thickness determination device 4 may be provided with a memory that stores a plating film thickness determination table. In this case, the first plating film thickness determination device 4, for example, calculates and outputs in the plating film thickness determination table the film thickness (μm) of the plating layer before grinding or the plating adhesion weight (g / m2) of the plating layer before grinding that correspond to the previously inputted sheet passing speed and width direction length of the steel sheet and the measured plating conditions. 2 ) to determine the first plating film thickness information. For example, the first plating film thickness determination device 4 may determine the film thickness (μm) of the plating layer before grinding or the plating coverage (g / m2) of the plating layer before grinding using a calculation program stored in advance based on the previously inputted sheet passing speed and width direction length of the steel sheet and the measured plating conditions. 2 ) may be calculated to determine the first plating film thickness information.

[0062] [About the second plating thickness determination device] The second plating thickness determination device 5 is disposed downstream of the grinding device 3, determines second plating thickness information relating to the thickness of the ground plating layer, and outputs the second plating thickness information. The second plating thickness determination device 5 may be provided with a screen, and the second plating thickness information may be output to this screen.

[0063] The second plating thickness information may be, for example, the thickness (μm) of the plating layer after grinding, or the plating adhesion weight (g / m 2 The second plating film thickness information is determined by measurement. Specifically, the second plating film thickness information may be the thickness (μm) of the plating layer after grinding by the grinding device 3, or the plating coating weight (g / m 2 ) and the measured film thickness (μm) or plating coverage (g / m 2 ) may be determined as the second plating thickness information. In this case, the second plating thickness determination device 5 is, for example, a fluorescent X-ray thickness meter.

[0064] The above-mentioned manufacturing apparatus 1 for manufacturing textured plated steel sheet includes not only the second plating film thickness determining device 5 but also the first plating film thickness determining device 4. Therefore, when a product defect occurs due to insufficient plating layer thickness and poor appearance, it is easy to identify which of the two factors, (1) the plating amount of the plating layer formed in the plating layer forming process and (2) the grinding amount of the plating layer ground in the grinding process, caused the product defect.

[0065] [Method of manufacturing textured plated steel sheet] A method for manufacturing a textured plated steel sheet will be described using the above-mentioned manufacturing apparatus 1 for manufacturing a textured plated steel sheet. The method for manufacturing a textured plated steel sheet of this embodiment includes a plating layer forming step, a grinding step, a plating film thickness determining step, and an adjustment step.

[0066] [Plating layer formation process] In the plating layer forming step, a plating layer is formed on the surface of the steel sheet 6 by electroplating or hot-dip galvanizing to produce a plated steel sheet 7. When the above-mentioned textured plated steel sheet is produced by electroplating, the plating apparatus 2 is, for example, an electrogalvanizing apparatus 200. When the above-mentioned textured plated steel sheet is produced by hot-dip galvanizing, the plating apparatus 2 is, for example, a hot-dip galvanizing apparatus 210.

[0067] [Electrolytic zinc plating method] As an example, a case will be described in which a plated steel sheet 7 is manufactured by forming a plating layer on the surface of a steel sheet 6 by an electrolytic zinc plating method. The electrolytic zinc plating method may be performed by a well-known method. In this specification, the electrolytic zinc plating method also includes an electrolytic zinc alloy plating method. A well-known plating solution may be used as the plating solution used in the electrolytic zinc plating method. The electrolytic zinc plating solution may be, for example, a sulfate bath, a chloride bath, a zincate bath, a cyanide bath, a pyrophosphate bath, a boric acid bath, a citric acid bath, other complex baths, and combinations thereof. The electrolytic zinc alloy plating solution may contain, in addition to Zn ions, one or more single ions or complex ions selected from the group consisting of Fe, Ni, Co, Cr, and C. In addition, organic additives may be added to the plating solution as appropriate to obtain a desired effect such as a leveling effect or an increase in hardness.

[0068] The plating solution used in the electrolytic zinc plating method may contain, for example, zinc sulfate heptahydrate: 200 to 400 g / L, sodium sulfate: 15 to 100 g / L, and a pH of 1.0 to 2.5.

[0069] In the electrolytic zinc plating method, the zinc ion concentration in the electrolytic zinc plating solution and the electrolytic zinc alloy plating solution, the temperature, pH, the running speed of the steel sheet 6, the current density, and the like can be appropriately set. The zinc ion concentration in the plating solution is, for example, 0.8 to 1.5 mol / L. The temperature of the plating solution is, for example, 40 to 60° C. The running speed of the steel sheet 6 is, for example, 20 to 200 m / min. The current density is, for example, 10 to 200 A / dm 2 The thickness of the plating layer formed by carrying out the electrolytic galvanizing method can be adjusted, for example, by adjusting the speed at which the steel sheet 6 is passed through the plating solution and / or the current density when carrying out the electrolytic galvanizing method. As a result, a plating layer is formed on the surface of the steel sheet 6, and the plated steel sheet 7 can be produced.

[0070] [Hot-dip galvanizing method] As an example, a case will be described in which a plated steel sheet 7 is manufactured by forming a plating layer on the surface of a steel sheet 6 by a hot-dip galvanizing method. The hot-dip galvanizing method may be performed by a known method. A known plating bath may be used as the plating bath for the hot-dip galvanizing method. For example, a hot-dip galvanizing bath containing Al with the balance being Zn and impurities may be used. The impurity may be Fe. The hot-dip galvanizing bath may contain one or more elements selected from the group consisting of Mg, Si, Ca, Y, La, Ce, Sn, Bi, In, Cr, Ti, Ni, Co, V, Nb, Cu, Mn, Sr, Sb, Pb, and B in addition to Zn, Al, and Fe.

[0071] In the hot dip galvanizing method, the Al concentration, Fe concentration, concentrations of other elements, temperature, pH, the passing speed of the steel sheet 6, the collision pressure of the wiping gas, and the rolling reduction in the skin pass mill 218 in the hot dip galvanizing bath can be appropriately set. The Al concentration is, for example, 0.1 to 60.0 mass%. The Fe concentration is, for example, 0.01 to 0.5 mass%. When the hot dip galvanizing bath contains one or more elements selected from the group consisting of Mg, Si, Ca, Y, La, Ce, Sn, Bi, In, Cr, Ti, Ni, Co, V, Nb, Cu, Mn, Sr, Sb, Pb, and B in addition to Zn, Al, and Fe, the contents of these elements are, for example, 0.0 to 15.0 mass% in total. The temperature of the hot dip galvanizing bath is, for example, 430 to 630°C. The passing speed of the steel sheet 6 is, for example, 60 to 150 m / min. The impingement pressure of the wiping gas is, for example, 0 to 200 kPa. The reduction ratio in the skin pass mill 218 is, for example, 0 to 3.0%. The thickness of the coating layer formed by carrying out the hot-dip galvanizing method can be adjusted, for example, by adjusting the sheet passing speed of the steel sheet 6 in the coating solution, the impingement pressure of the wiping gas, and / or the reduction ratio in the skin pass mill 218 when carrying out the hot-dip galvanizing method. As a result, a coating layer is formed on the surface of the steel sheet 6, and the coated steel sheet 7 can be produced.

[0072] [Grinding process] In the grinding process, the surface of the plating layer of the plated steel sheet 7 is ground to form a texture on the surface of the plating layer. The texture is, for example, a hairline. In the above-mentioned manufacturing apparatus 1 for a textured plated steel sheet, the surface of the plating layer is ground by the grinding device 3 having the abrasive belt 33 to form a hairline on the surface of the plating layer.

[0073] In the grinding step, the speed at which the plated steel sheet 7 passes through the grinding device 3, the rotation speed of the contact roll 32, and the pressing force of the contact roll 32 against the plated steel sheet 7 can be appropriately adjusted. The speed at which the plated steel sheet 7 passes through the grinding device 3 is, for example, 20 to 200 m / min. The rotation speed of the contact roll 32 is, for example, 10 to 1500 rpm. The pressing force of the contact roll 32 against the plated steel sheet 7 is, for example, 0.01 to 0.10 MPa. The amount of the plating layer to be ground in the grinding step can be adjusted by adjusting the rotation speed of the contact roll 32 and the pressing force of the contact roll 32 against the plated steel sheet 7. When the grinding device 3 includes a grinding brush, the amount of grinding can be adjusted, for example, by adjusting the rotation speed of the grinding brush and / or the pressing force of the grinding brush against the plated steel sheet 7.

[0074] [Plating thickness determination process] In the plating thickness determination step, first plating thickness information related to the thickness of the plating layer of the plated steel sheet 7 after the plating layer formation step and before the grinding step, and second plating thickness information related to the thickness of the plating layer of the plated steel sheet 8 after the grinding step are determined. The first plating thickness information may be determined by measuring the thickness of the plating layer of the plated steel sheet after the plating layer formation step and before the grinding step. The first plating thickness information may be plating conditions in the plating layer formation step. The first plating thickness information may be determined based on the plating conditions in the plating layer formation step. The second plating thickness information is determined by measuring the thickness of the plating layer of the plated steel sheet after the grinding step.

[0075] [Adjustment process] In the adjusting step, the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step are adjusted based on the first and second plating film thickness information.

[0076] For example, when the first plating thickness information is above the reference range and the second plating thickness information is above the reference range, the plating amount of the plating layer formed in the plating layer forming step may be reduced and the grinding amount of the plating layer ground in the grinding step may be increased. In this case, the reduction in the plating amount of the plating layer formed in the plating layer forming step and the increase in the grinding amount of the plating layer ground in the grinding step may be performed simultaneously. Alternatively, the first plating thickness information may be confirmed, and when the first plating thickness information is above the reference range, the plating amount of the plating layer formed in the plating layer forming step may be reduced while maintaining the grinding amount of the plating layer ground in the grinding step, and then the second plating thickness information may be confirmed, and when the second plating thickness information is above the reference range, the grinding amount of the plating layer ground in the grinding step may be increased while maintaining the plating amount of the plating layer formed in the plating layer forming step.

[0077] When the plating apparatus 2 is an electrolytic zinc plating apparatus 200, the plating amount of the plating layer formed in the plating layer forming step can be reduced by, for example, the following method. For example, the sheet passing speed (m / min) of the steel sheet 6 in the plating solution may be increased. For example, the current density (A / dm 2 ) may be decreased. Only one of these conditions may be adjusted, or a combination of two or more may be adjusted. When the coating apparatus 2 is a hot-dip galvanizing apparatus 210, the coating amount of the coating layer formed in the coating layer forming step can be reduced, for example, by the following method. For example, the sheet passing speed (m / min) of the steel sheet 6 in the coating solution may be increased. For example, the collision pressure of the wiping gas may be increased. For example, the reduction rate in the skin pass mill 218 may be increased. Only one of these conditions may be adjusted, or a combination of two or more may be adjusted.

[0078] When increasing the amount of the plating layer ground in the grinding process, for example, the sheet passing speed (m / min) of the plated steel sheet 7 through the grinding device 3 may be slowed down, the rotation speed (rpm) of the contact roll 32 may be increased, or the pressing force (MPa) of the contact roll 32 against the plated steel sheet 7 may be increased. When the grinding device 3 is equipped with a grinding brush, the rotation speed of the grinding brush may be increased, or the pressing force of the grinding brush against the plated steel sheet 7 may be increased. Of these conditions, only one of them may be adjusted, or a combination of two or more may be adjusted.

[0079] For example, when the first plating thickness information is greater than the reference range and the second plating thickness information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be reduced, and the grinding amount of the plating layer ground in the grinding step may be reduced. In this case, the reduction in the plating amount of the plating layer formed in the plating layer forming step and the reduction in the grinding amount of the plating layer ground in the grinding step may be performed simultaneously. Alternatively, the first plating thickness information may be confirmed, and when the first plating thickness information is greater than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be reduced while maintaining the grinding amount of the plating layer ground in the grinding step, and then the second plating thickness information may be confirmed, and when the second plating thickness information is less than the reference range, the grinding amount of the plating layer ground in the grinding step may be reduced while maintaining the plating amount of the plating layer formed in the plating layer forming step.

[0080] When reducing the amount of the plating layer ground in the grinding process, for example, the sheet passing speed (m / min) of the plated steel sheet 7 through the grinding device 3 may be increased, the rotation speed (rpm) of the contact roll 32 may be decreased, or the pressing force (MPa) of the contact roll 32 pressing against the plated steel sheet 7 may be decreased. When the grinding device 3 is equipped with a grinding brush, the rotation speed of the grinding brush may be decreased, or the pressing force of the grinding brush pressing against the plated steel sheet 7 may be decreased. Of these conditions, only one of them may be adjusted, or a combination of two or more may be adjusted.

[0081] For example, when the first plating film thickness information is within a standard range and the second plating film thickness information exceeds the standard range, the plating amount of the plating layer formed in the plating layer formation process may be maintained, and the grinding amount of the plating layer ground in the grinding process may be increased.

[0082] For example, when the first plating film thickness information is within a standard range and the second plating film thickness information is within a standard range, the plating amount of the plating layer formed in the plating layer formation process is maintained, and the grinding amount of the plating layer ground in the grinding process is maintained.

[0083] For example, when the first plating film thickness information is within a reference range and the second plating film thickness information is less than the reference range, the plating amount of the plating layer formed in the plating layer formation process may be maintained, and the grinding amount of the plating layer ground in the grinding process may be reduced.

[0084] For example, when the first plating thickness information is less than the reference range and the second plating thickness information is greater than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be increased and the grinding amount of the plating layer ground in the grinding step may be increased. In this case, the increase in the plating amount of the plating layer formed in the plating layer forming step and the increase in the grinding amount of the plating layer ground in the grinding step may be performed simultaneously. Alternatively, the first plating thickness information may be confirmed, and when the first plating thickness information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be increased while maintaining the grinding amount of the plating layer ground in the grinding step, and then the second plating thickness information may be confirmed, and when the second plating thickness information is greater than the reference range, the grinding amount of the plating layer ground in the grinding step may be increased while maintaining the plating amount of the plating layer formed in the plating layer forming step.

[0085] When the plating apparatus 2 is an electrolytic zinc plating apparatus 200, the plating amount of the plating layer formed in the plating layer forming step can be increased by, for example, the following method. For example, the sheet passing speed (m / min) of the steel sheet 6 in the plating solution may be slowed down. For example, the current density (A / dm 2) may be increased. Only one of these conditions may be adjusted, or a combination of two or more may be adjusted. When the coating apparatus 2 is a hot-dip galvanizing apparatus 210, the coating amount of the coating layer formed in the coating layer forming step can be increased, for example, by the following method. For example, the sheet passing speed (m / min) of the steel sheet 6 in the coating solution may be slowed down. For example, the collision pressure of the wiping gas may be reduced. For example, the reduction rate in the skin pass mill 218 may be reduced. Only one of these conditions may be adjusted, or a combination of two or more may be adjusted.

[0086] For example, when the first plating thickness information is less than the reference range and the second plating thickness information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be increased and the grinding amount of the plating layer ground in the grinding step may be decreased. In this case, the increase in the plating amount of the plating layer formed in the plating layer forming step and the reduction in the grinding amount of the plating layer ground in the grinding step may be performed simultaneously. Alternatively, the first plating thickness information may be confirmed, and when the first plating thickness information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step may be increased while maintaining the grinding amount of the plating layer ground in the grinding step, and then the second plating thickness information may be confirmed, and when the second plating thickness information is less than the reference range, the grinding amount of the plating layer ground in the grinding step may be decreased while maintaining the plating amount of the plating layer formed in the plating layer forming step.

[0087] The method for producing a textured plated steel sheet of this embodiment is carried out using a continuous line type manufacturing apparatus for a textured plated steel sheet. Therefore, the steel sheet is not wound or unwound between the plating layer forming process and the grinding process. In addition, in the method for producing a textured plated steel sheet of this embodiment, in the adjustment process, the plating amount and the grinding amount are adjusted based on the first and second plating film thickness information for the same steel sheet coil as the steel sheet coil from which the first and second plating film thickness information was obtained.

[0088] The reference range of the first plating film thickness information can be appropriately set and is not particularly limited. For example, the first plating film thickness information may be a plating adhesion weight (g / m2 ), the reference range of the first plating thickness information is, for example, 10 to 320 g / m 2 The first plating thickness information may be a current density (kA / m 2 ), the reference range of the first plating thickness information is, for example, 1 to 20 kA / m 2 In the case where the first plating film thickness information is the sheet passing speed (m / min) among the plating conditions in the plating apparatus 2, the reference range of the first plating film thickness information may be, for example, 30 to 200 m / min. In the case where the first plating film thickness information is the collision pressure (kPa) of the wiping gas among the plating conditions in the plating apparatus 2, the reference range of the first plating film thickness information may be, for example, 0 to 200 kPa. In the case where the first plating film thickness information is the reduction rate in the skin pass mill 218 among the plating conditions in the plating apparatus 2, the reference range of the first plating film thickness information may be, for example, 0 to 3.0%.

[0089] The reference range of the second plating film thickness information can be appropriately set and is not particularly limited. For example, the second plating film thickness information may be a plating adhesion weight (g / m 2 ), the reference range of the second plating thickness information is, for example, 5 to 300 g / m 2 may be also possible.

[0090] As described above, in the method for producing a textured plated steel sheet of the present embodiment, in the plating thickness determination step, not only the second plating thickness information related to the thickness of the plating layer after grinding but also the first plating thickness information related to the thickness of the plating layer before grinding is determined, and further, in the adjustment step, the plating amount of the plating layer formed in the plating layer formation step and the grinding amount of the surface of the plating layer ground in the grinding step are adjusted based on the first and second plating thickness information. As a result, when a product defect occurs due to an insufficient thickness of the plating layer and a defective appearance, it is possible to quickly identify which of the two factors, (1) the plating amount of the plating layer formed in the plating layer formation step and (2) the grinding amount of the plating layer ground in the grinding step, caused the product defect. Furthermore, by eliminating the cause of the product defect, (1) or (2), it is possible to suppress a product defect in which the corrosion resistance is reduced due to an insufficient thickness of the plating layer and / or a product defect in which a defective appearance occurs due to an insufficient texture formation. In addition, even in a continuous line type manufacturing device, since the cause of the product defect can be quickly identified and fed back, it is possible to suppress a decrease in production speed and suppress product defects.

[0091] [Second embodiment] Fig. 5 is an overall view of the manufacturing apparatus 1 for a textured plated steel sheet in the second embodiment when a control device is provided. With reference to Fig. 5, in the second embodiment, the manufacturing apparatus 1 for a textured plated steel sheet has the same configuration as the manufacturing apparatus 1 for a textured plated steel sheet in the first embodiment, and further includes a control device 9. In the second embodiment, the first plating film thickness determination device 4 outputs first plating film thickness information to the control device 9, and the second plating film thickness determination device 5 outputs second plating film thickness information to the control device 9.

[0092] [About the control device] The control device 9 controls the plating device 2 to adjust the plating amount of the plating layer formed on the surface of the steel sheet 6 by the plating device 2 based on the first plating film thickness information and the second plating film thickness information, and controls the grinding device 3 to adjust the grinding amount of the surface of the plating layer to be ground by the grinding device 3 based on the first plating film thickness information and the second plating film thickness information. When the control device 9 is provided, the manufacturing apparatus 1 for textured plated steel sheets can more easily identify the cause of product defects based on insufficient thickness of the plating layer and poor appearance. Therefore, it is more easy to suppress product defects caused by reduced corrosion resistance due to insufficient thickness of the plating layer and / or product defects caused by poor appearance due to insufficient texture formation. When the control device 9 is provided, the manufacturing apparatus 1 for textured plated steel sheets can further easily suppress unnecessary manufacturing costs in addition to suppressing product defects.

[0093] 6 is a functional block diagram of the control device 9. With reference to FIG. 6, the control device 9 includes an adjustment unit 91, a plating device control unit 92, and a grinding device control unit 93.

[0094] The adjustment unit 91 determines how to control the plating apparatus 2 and the grinding apparatus 3 based on the first and second plating film thickness information output from the first plating film thickness determination device 4 and the second plating film thickness determination device 5, and outputs the result. The plating apparatus control unit 92 controls the plating apparatus 2 based on the result determined by the adjustment unit 91. When the plating apparatus 2 is an electrolytic zinc plating apparatus 200, the plating apparatus control unit 92 controls, for example, the sheet passing speed (m / min) of the steel sheet 6 in the plating solution and / or the current density (A / dm 2). When the coating device 2 is a hot-dip galvanizing device 210, the coating device control unit 92 controls, for example, the sheet passing speed (m / min) of the steel sheet 6 in the coating solution, the collision pressure (kPa) of the wiping gas, and / or the rolling reduction rate (%) in the skin pass mill 218. This adjusts the coating amount of the coating layer formed in the coating device 2. The grinding device control unit 93 controls the grinding device 3 based on the result determined by the adjustment unit 91. When the grinding device 3 is a grinding device 3 equipped with an abrasive belt 33, the grinding device control unit 93 controls, for example, the sheet passing speed (m / min) of the plated steel sheet 7 through the grinding device 3, the rotation speed (rpm) of the contact roll 32, and the rolling reduction force (MPa) of the contact roll 32 pressed against the plated steel sheet 7. When the grinding device 3 is a grinding device 3 equipped with a grinding brush, the grinding device control unit 93 controls, for example, the rotation speed of the grinding brush and the rolling reduction force of the grinding brush pressed against the plated steel sheet 7. This allows the amount of the plating layer surface to be ground by the grinding device 3 to be adjusted.

[0095] FIG. 7 is a functional block diagram showing an example of a hardware configuration of the control device 9. Referring to FIG. 7, the control device 9 includes a central processing unit (CPU) 94, a memory 95, an interface 96 (shown as I / F in FIG. 7), and a hard disk 97 (shown as HDD in FIG. 7). These components are connected to each other via a bus. A plating condition adjustment program and a grinding condition adjustment program are stored in the hard disk 97. The plating condition adjustment program and the grinding condition adjustment program are loaded into the memory 95 and executed by the CPU 94 to realize the operations of the adjustment unit 91, the plating device control unit 92, and the grinding device control unit 93 described above. The hard disk 97 is not particularly limited as long as it is a storage medium. For example, it may be an SSD.

[0096] [Operation of the textured plated steel sheet manufacturing equipment 1] The operation of the manufacturing apparatus 1 for manufacturing a textured plated steel sheet having the above-mentioned configuration will be described below.

[0097] 8, the control device 9 first acquires the first plating thickness information output from the first plating thickness determining device 4 (S1). The control device 9 then acquires the second plating thickness information output from the second plating thickness determining device 5 (S2). In FIG. 8, the control device 9 acquires the first plating thickness information and then the second plating thickness information. However, the control device 9 may acquire the first plating thickness information after acquiring the second plating thickness information, or may acquire the first and second plating thickness information simultaneously.

[0098] The adjustment unit 91 of the control device 9 determines grinding amount information, which is information regarding the amount of grinding performed by the grinding device 3, based on the obtained first plating film thickness information and second plating film thickness information (S3). For example, when the first and second plating film thickness information are the film thickness (μm) of the plating layer, the grinding amount information (μm) is determined by subtracting the second plating film thickness information (μm), which is the film thickness of the plating layer after grinding, from the first plating film thickness information (μm), which is the film thickness of the plating layer before grinding. When the first and second plating film thickness information are the plating adhesion weight (g / m 2 ) is also true.

[0099] When the first plating thickness information is the plating conditions of the plating device 2, the adjustment unit 91 of the control device 9 determines, from the plating conditions of the plating device 2, the thickness (μm) of the plating layer before grinding or the plating adhesion weight (g / m 2 The calculated first plating thickness (μm) or first plating coating weight (g / m 2 ) to obtain the measured second plating thickness (μm) or second plating coating weight (g / m 2 ) to obtain the grinding amount information.

[0100] The operation after the grinding amount information is obtained (S3) is in accordance with any one of patterns 1 to 9.

[0101] [For patterns 1 to 3] The adjustment unit 91 of the control device 9 judges whether the second plating film thickness information is within a reference range (S4 in FIG. 8). If the second plating film thickness information is above the reference range ("above reference range" in S4 in FIG. 8), the adjustment unit 91 of the control device 9 then judges whether the grinding amount information is within a reference range (S5 in FIG. 9). Depending on whether the grinding amount information is above the reference range, below the reference range, or within the reference range, the adjustment unit 91 of the control device 9 issues an instruction for one of patterns 1 to 3.

[0102] [In the case of pattern 1] If the grinding amount information is outside the standard range ("Outside the standard range" in S5 of Figure 9), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is outside the standard range and the grinding amount information is outside the standard range, and issues an instruction for pattern 1 (S6).

[0103] When the second plating film thickness information is outside the reference range and the grinding amount information is outside the reference range, the plating amount of the plating layer formed by the plating device 2 is too large, and furthermore, the plating layer is ground more than necessary by the grinding device 3, which increases unnecessary costs. Therefore, in consideration of costs, it is preferable to change the operating conditions to reduce the plating amount of the plating layer formed by the plating device 2 and to reduce the grinding amount of the plating layer ground by the grinding device 2.

[0104] In pattern 1, an instruction is issued to control the plating device 2 so as to reduce the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer to be ground by the grinding device 3. In response to the instruction in pattern 1, the plating device control unit 92 controls the plating device 2 so as to reduce the plating amount of the plating layer to be formed by the plating device 2. In response to the instruction in pattern 1, the grinding device control unit 93 controls the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer to be ground by the grinding device 3.

[0105] [In the case of pattern 2] If the grinding amount information is below the standard range ("below standard range" in S5 of FIG. 9), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information exceeds the standard range and the grinding amount information is below the standard range, and issues an instruction for pattern 2 (S7 of FIG. 9).

[0106] When the second plating film thickness information is above the reference range and the grinding amount information is below the reference range, the surface of the plating layer is not sufficiently ground by the grinding device 3, and therefore sufficient texture is not formed on the surface of the plating layer, resulting in a defective appearance. In this case, since the second plating film thickness information exceeds the reference range, it is found that a product defect occurs due to the grinding amount of the plating layer ground by the grinding device 3. In this case, it is necessary to change the operating conditions to increase the grinding amount of the plating layer ground by the grinding device 3 and form a sufficient texture on the surface of the plating layer.

[0107] In pattern 2, an instruction is issued to control the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 2, the grinding device control unit 93 controls the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0108] [In the case of pattern 3] If the grinding amount information is within the standard range ("within standard range" in S5 of FIG. 9), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information exceeds the standard range and the grinding amount information is within the standard range, and issues an instruction for pattern 3 (S8 of FIG. 9).

[0109] When the second plating film thickness information is above the reference range and the grinding amount information is within the reference range, the plating amount of the plating layer formed by the plating device 2 is too large, which increases unnecessary costs. Therefore, in consideration of costs, it is preferable to change the operating conditions and reduce the plating amount of the plating layer formed by the plating device 2.

[0110] In pattern 3, an instruction is issued to control the plating device 2 so as to reduce the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 3, the plating device control unit 92 controls the plating device 2 so as to reduce the plating amount of the plating layer formed by the plating device 2, and controls the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0111] [For patterns 4 to 6] The adjustment unit 91 of the control device 9 judges whether the second plating film thickness information is within a reference range (S4 in FIG. 8). If the second plating film thickness information is less than the reference range ("less than reference range" in S4 in FIG. 8), the adjustment unit 91 of the control device 9 then judges whether the grinding amount information is within a reference range (S9 in FIG. 10). Depending on whether the grinding amount information is greater than the reference range, less than the reference range, or within the reference range, the adjustment unit 91 of the control device 9 issues an instruction for one of patterns 4 to 6.

[0112] [In case of pattern 4] If the grinding amount information is outside the standard range ("Outside standard range" in S9 of FIG. 10), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is below the standard range and the grinding amount information is outside the standard range, and issues an instruction for pattern 4 (S10 of FIG. 10).

[0113] When the second plating film thickness information is below the reference range and the grinding amount information is above the reference range, the second plating film thickness information being below the reference range means that the final film thickness of the plating layer is insufficient, which reduces the corrosion resistance of the textured plated steel sheet and results in a defective product. In addition, in this case, the grinding amount information being above the reference range means that the defective product occurs due to the grinding amount of the plating layer ground by the grinding device 3. In this case, it is necessary to change the operating conditions and reduce the grinding amount of the plating layer ground by the grinding device 3.

[0114] In pattern 4, an instruction is issued to control the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 4, the grinding device control unit 93 controls the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0115] [In the case of pattern 5] If the grinding amount information is below the standard range ("Below the standard range" in S9 of FIG. 10), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is below the standard range and the grinding amount information is below the standard range, and issues an instruction for pattern 5 (S11 of FIG. 10).

[0116] When the second plating film thickness information is less than the reference range and the grinding amount information is less than the reference range, the second plating film thickness information is less than the reference range, so that the corrosion resistance of the textured plated steel sheet is reduced due to insufficient final film thickness of the plating layer, resulting in a defective product. In this case, the grinding amount information is further less than the reference range, so that the surface of the plating layer is not sufficiently ground by the grinding device 3, and therefore a sufficient texture is not formed on the surface of the plating layer, resulting in a defective appearance. In addition, since the second plating film thickness information is less than the reference range, it is found that the defective product occurs due to both the plating amount of the plating layer formed by the plating device 2 and the grinding amount of the plating layer ground by the grinding device 3. In this case, it is necessary to change the operating conditions to increase the plating amount of the plating layer formed by the plating device 2 and increase the grinding amount of the plating layer ground by the grinding device 3.

[0117] In pattern 5, an instruction is issued to control the plating device 2 so as to increase the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 5, the plating device control unit 92 controls the plating device 2 so as to increase the plating amount of the plating layer formed by the plating device 2. In response to the instruction in pattern 5, the grinding device control unit 93 controls the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0118] [In the case of pattern 6] If the grinding amount information is within the standard range ("within standard range" in S9 of FIG. 10), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is less than the standard range and the grinding amount information is within the standard range, and issues an instruction for pattern 6 (S12 of FIG. 10).

[0119] When the second plating film thickness information is below the reference range and the grinding amount information is within the reference range, the second plating film thickness information being below the reference range means that the final film thickness of the plating layer is insufficient, which reduces the corrosion resistance of the textured plated steel sheet and results in a defective product. In this case, it is further found that the plating amount of the plating layer formed by plating device 2 is insufficient because the grinding amount information is within the reference range. In this case, it is necessary to change the operating conditions to increase the plating amount of the plating layer formed by plating device 2.

[0120] In pattern 6, an instruction is issued to control the plating device 2 so as to increase the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 6, the plating device control unit 92 controls the plating device 2 so as to increase the plating amount of the plating layer formed by the plating device 2, and controls the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0121] [For patterns 7 to 9] The adjustment unit 91 of the control device 9 judges whether the second plating film thickness information is within a reference range (S4 in FIG. 8). If the second plating film thickness information is within the reference range ("within reference range" in S4 in FIG. 8), the adjustment unit 91 of the control device 9 then judges whether the grinding amount information is within a reference range (S13 in FIG. 11). Depending on whether the grinding amount information is above the reference range, below the reference range, or within the reference range, the adjustment unit 91 of the control device 9 issues an instruction for one of patterns 7 to 9.

[0122] [In case of pattern 7] If the grinding amount information is outside the standard range ("Outside standard range" in S13 of FIG. 11), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is within the standard range and that the grinding amount information is outside the standard range, and issues an instruction for pattern 7 (S14 of FIG. 11).

[0123] When the second plating film thickness information is within the reference range and the grinding amount information is above the reference range, the grinding device 3 grinds off more of the plating layer surface than necessary. This increases unnecessary costs. Therefore, in consideration of costs, it is preferable to reduce the amount of the plating layer ground off by the grinding device 3.

[0124] In pattern 7, an instruction is issued to control the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 7, the grinding device control unit 93 controls the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to reduce the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0125] [In the case of pattern 8] If the grinding amount information is below the standard range ("below standard range" in S13 of FIG. 11), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is within the standard range and the grinding amount information is below the standard range, and issues an instruction for pattern 8 (S15 of FIG. 11).

[0126] When the second plating film thickness information is within the standard range and the grinding amount information is below the standard range, the grinding amount information is below the standard range, so the surface of the plating layer is not sufficiently ground by the grinding device 3, and sufficient texture is not formed on the surface of the plating layer, resulting in a defective appearance. In this case, since the second plating film thickness information is within the standard range, it is found that the product defect is caused by the grinding amount of the plating layer ground by the grinding device 3. In this case, it is necessary to increase the grinding amount of the plating layer ground by the grinding device 3.

[0127] In pattern 8, an instruction is issued to control the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 8, the grinding device control unit 93 controls the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to increase the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0128] [In the case of pattern 9] If the grinding amount information is within the standard range ("Within standard range" in S13 of FIG. 11), the adjustment unit 91 of the control device 9 determines that the second plating film thickness information is within the standard range and the grinding amount information is within the standard range, and issues an instruction for pattern 9 (S16 of FIG. 11).

[0129] If the second plating film thickness information is within the standard range and the grinding amount information is within the standard range, it is found that there is no insufficient final plating film thickness and no product defects due to poor appearance, and furthermore, the cost is appropriately controlled. In this case, it is sufficient to maintain the operating conditions.

[0130] In pattern 9, an instruction is issued to control the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and to control the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3. In response to the instruction in pattern 9, the plating device control unit 92 controls the plating device 2 so as to maintain the plating amount of the plating layer formed by the plating device 2, and controls the grinding device 3 so as to maintain the grinding amount of the surface of the plating layer ground by the grinding device 3.

[0131] Through the above operations, the apparatus 1 for manufacturing textured plated steel sheets according to the present embodiment manufactures a textured plated steel sheet 8 while controlling the plating device 2 to adjust the plating amount of the plating layer formed on the surface of the steel sheet 6 by the plating device 2 based on the first plating film thickness information and the second plating film thickness information, and controlling the grinding device 3 to adjust the grinding amount of the surface of the plating layer to be ground by the grinding device 3. This makes it easier to identify the cause of product defects due to insufficient thickness of the plating layer and poor appearance. In this case, it is easier to further suppress product defects caused by reduced corrosion resistance due to insufficient thickness of the plating layer and / or product defects caused by poor appearance due to insufficient texture formation. When the apparatus 1 for manufacturing textured plated steel sheets is provided with the control device 9, the apparatus 1 for manufacturing textured plated steel sheets can further easily suppress production costs in addition to product defects.

[0132] [Method of manufacturing textured plated steel sheet] The method for producing a textured plated steel sheet equipped with the control device 9 of this embodiment is the same as that of the first embodiment, except that a production apparatus for a textured plated steel sheet equipped with the control device 9 is used.

[0133] [Third embodiment] In the second embodiment, a control device 9 is used, but it is also possible to obtain grinding amount information, which is information regarding the grinding amount in the grinding device, based on the first plating film thickness information and the second plating film thickness information without using the control device 9, and adjust the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step based on the second plating film thickness information and the grinding amount information. The manufacturing apparatus 1 of the textured plated steel sheet used in the third embodiment is the same as that in the first embodiment.

[0134] [Method of manufacturing textured plated steel sheet] The method for manufacturing a textured plated steel sheet according to the third embodiment includes a plating layer forming step, a grinding step, a plating film thickness determining step, and an adjusting step. The steps other than the adjusting step are the same as those of the first embodiment. In the third embodiment, in the adjusting step, grinding amount information, which is information on the grinding amount in the grinding device, is obtained, and the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer to be ground in the grinding step are adjusted based on the second plating film thickness information and the grinding amount information.

[0135] [Adjustment process] In the adjustment step, grinding amount information is obtained based on the first plating film thickness and the second plating film thickness. The method of obtaining the grinding amount information is the same as that of the second embodiment, except that the control device 9 is not used. In the adjustment step, the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step are adjusted based on the second plating film thickness information and the grinding amount information, based on the following patterns 1 to 9.

[0136] [Pattern 1] When the second plating film thickness information is outside the reference range and the grinding amount information is outside the reference range, the plating amount of the plating layer formed in the plating layer forming step is reduced, and the grinding amount of the plating layer surface to be ground in the grinding step is reduced. The preparation method for reducing the plating amount of the plating layer formed in the plating layer forming step and the adjustment method for reducing the grinding amount of the plating layer surface to be ground in the grinding step are the same as those in the first embodiment.

[0137] [Pattern 2] When the second plating film thickness information is greater than the reference range and the grinding amount information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer to be ground in the grinding step is adjusted to be increased. The adjustment method for increasing the grinding amount of the surface of the plating layer to be ground in the grinding step is the same as that of the first embodiment.

[0138] [Pattern 3] When the second plating film thickness information is greater than the reference range and the grinding amount information is within the reference range, the plating amount of the plating layer formed in the plating layer forming step is reduced, and the grinding amount of the surface of the plating layer to be ground in the grinding step is adjusted to be maintained. The adjustment method for reducing the plating amount of the plating layer formed in the plating layer forming step is the same as that of the first embodiment.

[0139] [Pattern 4] When the second plating film thickness information is less than the reference range and the grinding amount information is greater than the reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer ground in the grinding step is adjusted to be reduced. The adjustment method for reducing the grinding amount of the surface of the plating layer ground in the grinding step is the same as that of the first embodiment.

[0140] [Pattern 5] When the second plating film thickness information is below the reference range and the grinding amount information is below the reference range, the plating amount of the plating layer formed in the plating layer forming step is increased, and the grinding amount of the plating layer surface to be ground in the grinding step is increased. The preparation method for increasing the plating amount of the plating layer formed in the plating layer forming step and the adjustment method for increasing the grinding amount of the plating layer surface to be ground in the grinding step are the same as those in the first embodiment.

[0141] [Pattern 6] When the second plating film thickness information is less than the reference range and the grinding amount information is within the reference range, the plating amount of the plating layer formed in the plating layer forming step is increased, and the grinding amount of the surface of the plating layer to be ground in the grinding step is adjusted to be maintained. The adjustment method for increasing the plating amount of the plating layer formed in the plating layer forming step is the same as that of the first embodiment.

[0142] [Pattern 7] When the second plating film thickness information is within the reference range and the grinding amount information is above the reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer to be ground in the grinding step is adjusted to be reduced. The adjustment method for reducing the grinding amount of the surface of the plating layer to be ground in the grinding step is the same as that of the first embodiment.

[0143] [Pattern 8] When the second plating film thickness information is within a reference range and the grinding amount information is less than the reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer to be ground in the grinding step is adjusted to be increased. The adjustment method for increasing the grinding amount of the surface of the plating layer to be ground in the grinding step is the same as that of the first embodiment.

[0144] [Pattern 9] When the second plating film thickness information is within a reference range and the grinding amount information is within a reference range, the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step are adjusted so as to be maintained. Specifically, the plating conditions in the plating layer forming step and the grinding conditions in the grinding step are maintained.

[0145] The above manufacturing process can reduce manufacturing costs as well as reduce product defects.

[0146] [Fourth embodiment] The manufacturing apparatus 1 for producing a textured plated steel sheet may include a coating film forming apparatus in addition to the plating apparatus 2, the grinding apparatus 3, the first plating film thickness determining apparatus 4, and the second plating film thickness determining apparatus 5. The coating film forming apparatus is disposed downstream of the grinding apparatus 3, and forms a coating film on the surface of the ground plating layer.

[0147] [Method of manufacturing textured plated steel sheet] When forming a coating film, the method for producing a textured plated steel sheet includes a coating film forming step in addition to a plating layer forming step, a grinding step, a plating film thickness determining step, and an adjustment step.

[0148] [Coating film formation process] The method for forming the coating film may be a well-known method. When forming an organic coating film, a paint constituting the organic coating is prepared. The prepared paint is applied onto the plating layer by a spraying method, a roll coater method, a curtain coater method, a dip and pull method, or the like. Thereafter, the paint on the plating layer is naturally dried or baked to form an organic coating film. The drying temperature, drying time, baking temperature, and baking time can be appropriately adjusted.

[0149] When forming an inorganic coating film as the coating film, an agent for the inorganic coating film is applied onto the plating layer by a roll coater method, a dip ringer method, a spray ringer method, an electrolytic method, or the like. The agent applied onto the plating layer is naturally dried or baked to form the inorganic coating film. The drying temperature, drying time, baking temperature, and baking time can be appropriately adjusted.

[0150] The other manufacturing steps in the fourth embodiment are the same as those in the first embodiment.

[0151] [Fifth embodiment] The manufacturing apparatus 1 for manufacturing a textured plated steel sheet may include one or more gloss meters in addition to the plating device 2, the grinding device 3, the first plating film thickness determining device 4, and the second plating film thickness determining device 5. The gloss meter is disposed downstream of the grinding device 3 and evaluates the appearance of the surface of the plated steel sheet including the ground plating layer.

[0152] The gloss meter may be two gloss meters, one for measuring the gloss of the surface of the plated steel sheet in the longitudinal direction of the plated steel sheet, and the other for measuring the gloss of the surface of the plated steel sheet in the width direction of the plated steel sheet. In this case, the appearance of the surface of the plated steel sheet having the ground plating layer can be evaluated with even greater accuracy.

[0153] [Method of manufacturing textured plated steel sheet] In the case of evaluating the appearance of the surface of a plated steel sheet having a ground plating layer, the method for producing a textured plated steel sheet includes a plating layer forming step, a grinding step, a plating film thickness determining step, and an adjustment step, as well as an appearance evaluation step, in which the appearance of the plated steel sheet after the grinding step is evaluated based on gloss.

[0154] [Appearance evaluation process] In the appearance evaluation step, the appearance of the plated steel sheet after the grinding step is evaluated based on the glossiness. In the appearance evaluation step, the appearance of the plated steel sheet may be evaluated based on two glossinesses, namely, the glossiness of the surface of the plated steel sheet measured in the longitudinal direction of the plated steel sheet, and the glossiness of the surface of the plated steel sheet measured in the sheet width direction of the plated steel sheet.

[0155] [Adjustment process] In the manufacturing method of the textured plated steel sheet of this embodiment, in the adjustment process, the plating amount of the plating layer formed in the plating layer formation process and the grinding amount of the plating layer surface ground in the grinding process are adjusted based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet after the grinding process.

[0156] When the appearance evaluation based on glossiness is performed, the appearance of the plated steel sheet can be evaluated with higher accuracy than when the appearance is estimated based on the first plating film thickness information and the second plating film thickness information. Therefore, when the appearance evaluation of the plated steel sheet based on glossiness is performed, the standard of the appearance of the plated steel sheet can be set under stricter conditions. However, in this case, even if the first plating film thickness information and the second plating film thickness information are within the standard range, the texture may not be sufficiently formed based on the appearance evaluation of the plated steel sheet based on glossiness, resulting in a poor appearance. In this case, the plating amount of the plating layer formed in the plating layer forming process and the grinding amount of the surface of the plating layer ground in the grinding process may be adjusted.

[0157] For example, when the first plating film thickness information and the second plating film thickness information are within the reference range, and the texture is not sufficiently formed and the appearance evaluation of the plated steel sheet based on the gloss is poor, the amount of the plating layer to be ground in the grinding step may be increased while maintaining the plating amount of the plating layer formed in the plating layer forming step. The method of increasing the amount of the plating layer to be ground in the grinding step is the same as that of the first embodiment.

[0158] In this case, when the second plating thickness information is within the reference range but close to the lower limit, for example, if the amount of grinding of the plating layer to be ground in the grinding step is increased while maintaining the amount of plating of the plating layer formed in the plating layer forming step, the amount of plating of the plating layer formed in the plating layer forming step may be increased and the amount of grinding of the plating layer to be ground in the grinding step may be increased if it is expected that the second plating thickness information will be below the reference range. The method of increasing the amount of plating of the plating layer formed in the plating layer forming step is the same as in the first embodiment.

[0159] Alternatively, an operation table may be created that includes plating conditions in the plating layer forming process that correspond to the gloss level, and grinding conditions in the grinding process that correspond to the gloss level, and the plating amount of the plating layer formed in the plating layer forming process and the grinding amount of the plating layer surface that is ground in the grinding process may be adjusted based on the measured gloss level.

[0160] The other manufacturing steps in the fifth embodiment are the same as those in the first embodiment.

[0161] The embodiments of the present disclosure have been described above. However, the above-described embodiments are merely examples for implementing the present disclosure. Therefore, the present disclosure is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments without departing from the spirit of the present disclosure. [Explanation of symbols]

[0162] 1: Textured plated steel sheet manufacturing equipment 2: Plating equipment 3: Grinding equipment 4: First plating thickness determination device 5: Second plating thickness determination device 6: Steel plate 7: Galvanized steel sheet 8: Textured galvanized steel sheet 9: Control device

Claims

1. a plating layer forming step of forming a plating layer on a surface of a steel sheet by an electroplating method or a hot-dip plating method to manufacture a plated steel sheet; a grinding step of grinding a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a plating thickness determination process for determining first plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the plating layer forming process and before the grinding process, and second plating thickness information regarding a thickness of the plating layer of the plated steel sheet after the grinding process; an adjustment step of adjusting a plating amount of the plating layer formed in the plating layer forming step and a grinding amount of the surface of the plating layer ground in the grinding step based on the first and second plating film thickness information, In the adjusting step, determining grinding amount information, which is information regarding the grinding amount in the grinding step, based on the first plating film thickness information and the second plating film thickness information; adjusting the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step based on the second plating film thickness information and the grinding amount information. A method for producing textured galvanized steel sheet.

2. A method for producing a textured plated steel sheet according to claim 1, comprising the steps of: In the adjusting step, When the second plating film thickness information is greater than a reference range and the grinding amount information is greater than a reference range, adjusting the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step to be reduced; When the second plating film thickness information is greater than a reference range and the grinding amount information is less than a reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer ground in the grinding step is increased. When the second plating film thickness information is greater than a reference range and the grinding amount information is within a reference range, the plating amount of the plating layer formed in the plating layer forming step is reduced, and the grinding amount of the surface of the plating layer ground in the grinding step is adjusted to be maintained; When the second plating film thickness information is less than a reference range and the grinding amount information is greater than a reference range, adjusting so as to maintain the plating amount of the plating layer formed in the plating layer forming step and reduce the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is less than a reference range and the grinding amount information is less than a reference range, adjusting so as to increase the plating amount of the plating layer formed in the plating layer forming step and to increase the grinding amount of the surface of the plating layer ground in the grinding step; When the second plating film thickness information is less than a reference range and the grinding amount information is within a reference range, the plating amount of the plating layer formed in the plating layer forming step is increased, and the grinding amount of the surface of the plating layer ground in the grinding step is adjusted to be maintained; When the second plating film thickness information is within a reference range and the grinding amount information is greater than the reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer ground in the grinding step is reduced. When the second plating film thickness information is within a reference range and the grinding amount information is less than a reference range, the plating amount of the plating layer formed in the plating layer forming step is maintained, and the grinding amount of the surface of the plating layer ground in the grinding step is increased. When the second plating film thickness information is within a reference range and the grinding amount information is within a reference range, adjustment is made so as to maintain the plating amount of the plating layer formed in the plating layer forming step and the grinding amount of the surface of the plating layer ground in the grinding step. A method for producing textured galvanized steel sheet.

3. A method for producing a textured plated steel sheet according to claim 1 or 2, comprising the steps of: In the plating thickness determination step, measuring a thickness of the plating layer of the plated steel sheet after the plating layer forming step and before the grinding step, and setting the measured thickness as the first plating thickness information. A method for producing textured galvanized steel sheet.

4. A method for producing a textured plated steel sheet according to any one of claims 1 to 3, In the plating thickness determination step, measuring a thickness of the plating layer of the plated steel sheet after the grinding process, and setting the measured thickness as the second plating thickness information. A method for producing textured galvanized steel sheet.

5. A method for producing a textured plated steel sheet according to any one of claims 1 to 4, In the plating layer forming step, the plating layer is formed by the electroplating method, In the plating thickness determination step, determining the first plating film thickness information based on a metal ion concentration in a plating solution, a sheet passing speed of the steel sheet through the plating solution, a width direction length of the steel sheet, a current density, a current efficiency, and / or a temperature of the plating solution in the plating layer forming step; A method for producing textured galvanized steel sheet.

6. A method for producing a textured plated steel sheet according to any one of claims 1 to 4, In the plating layer forming step, the plating layer is formed by the hot-dip plating method, In the plating thickness determination step, determining the first plating film thickness information based on a sheet passing speed of the steel sheet through a plating bath, a collision pressure of a wiping gas, and / or a rolling reduction rate in a skin pass mill in the plating layer forming step; A method for producing textured galvanized steel sheet.

7. The method for producing a textured plated steel sheet according to any one of claims 1 to 6, further comprising: A coating film forming step of forming a coating film on the surface of the plated steel sheet after the grinding step is included. A method for producing textured galvanized steel sheet.

8. The method for producing a textured plated steel sheet according to any one of claims 1 to 7, further comprising: An appearance evaluation step is provided in which the appearance of the plated steel sheet after the grinding step is evaluated based on the glossiness of the surface of the plated steel sheet after the grinding step. A method for producing textured galvanized steel sheet.

9. A method for producing a textured plated steel sheet according to claim 8, comprising the steps of: In the appearance evaluation step, evaluating the appearance of the plated steel sheet based on two gloss levels, namely, a gloss level of the surface of the plated steel sheet measured in the longitudinal direction of the plated steel sheet and a gloss level of the surface of the plated steel sheet measured in the sheet width direction of the plated steel sheet; A method for producing textured galvanized steel sheet.

10. A method for producing a textured plated steel sheet according to claim 8 or claim 9, In the adjusting step, adjusting a plating amount of the plating layer formed in the plating layer forming step and a grinding amount of the surface of the plating layer ground in the grinding step based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet after the grinding step; A method for producing textured galvanized steel sheet.

11. A plating apparatus for producing a plated steel sheet by performing hot-dip plating or electroplating to form a plating layer on a surface of the steel sheet; a grinding device disposed downstream of the plating device and configured to grind a surface of the plating layer of the plated steel sheet to form a texture on the surface of the plating layer; a first plating thickness determination device that determines first plating thickness information regarding a thickness of the plating layer before the grinding and outputs the first plating thickness information; a second plating thickness determination device disposed downstream of the grinding device, which determines second plating thickness information relating to a thickness of the ground plating layer and outputs the second plating thickness information; a control device for controlling the plating device and the grinding device, The control device includes: determining grinding amount information, which is information regarding the amount of grinding performed by the grinding device, based on the first plating film thickness information and the second plating film thickness information; controlling the plating device so as to adjust the plating amount of the plating layer formed on the surface of the steel sheet by the plating device based on the second plating film thickness information and the grinding amount information, and controlling the grinding device so as to adjust the grinding amount of the surface of the plating layer ground by the grinding device based on the second plating film thickness information and the grinding amount information. Equipment for producing textured galvanized steel sheets.

12. The apparatus for manufacturing a textured plated steel sheet according to claim 11, The control device includes: When the second plating film thickness information is outside a reference range and the grinding amount information is outside a reference range, the plating device is controlled to reduce the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is greater than a reference range and the grinding amount information is less than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is greater than a reference range and the grinding amount information is within a reference range, the plating device is controlled to reduce the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to maintain the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is greater than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is less than a reference range, the plating device is controlled to increase the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is less than a reference range and the grinding amount information is within a reference range, the plating device is controlled to increase the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to maintain the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is within a reference range and the grinding amount information is greater than the reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to reduce the grinding amount of the surface of the plating layer ground by the grinding device; When the second plating film thickness information is within a reference range and the grinding amount information is less than a reference range, the plating device is controlled to maintain the plating amount of the plating layer formed by the plating device, and the grinding device is controlled to increase the grinding amount of the surface of the plating layer ground by the grinding device; when the second plating film thickness information is within a reference range and the grinding amount information is within a reference range, controlling the plating device to maintain the plating amount of the plating layer formed by the plating device, and controlling the grinding device to maintain the grinding amount of the surface of the plating layer ground by the grinding device. Equipment for producing textured galvanized steel sheets.

13. The apparatus for producing a textured plated steel sheet according to claim 11 or 12, further comprising: a coating film forming device disposed downstream of the grinding device and forming a coating film on the ground surface of the plating layer; Equipment for producing textured galvanized steel sheets.

14. The apparatus for producing a textured plated steel sheet according to any one of claims 11 to 13, further comprising: one or more gloss meters arranged downstream of the grinding device for measuring the gloss of the surface of the plated steel sheet including the ground plating layer; Equipment for producing textured galvanized steel sheets.

15. The apparatus for producing textured plated steel sheet according to claim 14, The gloss meter is a gloss meter that measures the gloss of the surface of the plated steel sheet in the longitudinal direction of the plated steel sheet, and a gloss meter that measures the gloss of the surface of the plated steel sheet in the width direction of the plated steel sheet. Equipment for producing textured galvanized steel sheets.

16. The apparatus for manufacturing a textured plated steel sheet according to claim 14 or 15, The control device includes: controlling the plating device to adjust the plating amount of the plating layer formed on the surface of the steel sheet by the plating device based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet, and controlling the grinding device to adjust the grinding amount of the surface of the plating layer ground by the grinding device based on the first plating film thickness information, the second plating film thickness information, and the glossiness of the surface of the plated steel sheet. Equipment for producing textured galvanized steel sheets.

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