Method for producing textured plated steel sheet, and apparatus for producing textured plated steel sheet

Abstract

The method for producing a textured plated steel sheet includes: a plating layer forming process of forming a plating layer on a surface of a steel sheet a grinding process of grinding a surface of the plating layer to form a texture on the surface of the plating layer; a plating thickness determining process of determining first plating thickness information relating to a thickness of the plating layer at a time that is after the plating layer forming process and is before the grinding process, and second plating thickness information relating to a thickness of the plating layer after the grinding process; and an adjusting process of 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 that is ground in the grinding process, based on the first and second plating thickness information.

1 . A method for producing a textured plated steel sheet, comprising:
 a plating layer forming process of forming a plating layer on a surface of a steel sheet by an electroplating method or a hot-dip plating method to produce a plated steel sheet;   a grinding process 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 determining process of determining first plating thickness information relating to a thickness of the plating layer of the plated steel sheet at a time that is after the plating layer forming process and is before the grinding process, and second plating thickness information relating to a thickness of the plating layer of the plated steel sheet after the grinding process; and   an adjusting process of adjusting a plating amount of the plating layer that is formed in the plating layer forming process and a grinding amount of the surface of the plating layer that is ground in the grinding process, based on the first and second plating thickness information.   
     
     
         2 . The method for producing a textured plated steel sheet according to  claim 1 , wherein,
 in the adjusting process:   grinding amount information that is information relating to the grinding amount in the grinding process is determined based on the first plating thickness information and the second plating thickness information, and   the plating amount of the plating layer that is formed in the plating layer forming process and the grinding amount of the surface of the plating layer that is ground in the grinding process are adjusted based on the second plating thickness information and the grinding amount information.   
     
     
         3 . The method for producing a textured plated steel sheet according to  claim 2 , wherein,
 in the adjusting process:   in a case where the second plating thickness information is more than a reference range and the grinding amount information is more than a reference range, adjusting is performed so as to decrease the plating amount of the plating layer that is formed in the plating layer forming process and so as to decrease the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is more than a reference range and the grinding amount information is less than a reference range, adjusting is performed so as to maintain the plating amount of the plating layer that is formed in the plating layer forming process and so as to increase the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is more than a reference range and the grinding amount information is within a reference range, adjusting is performed so as to decrease the plating amount of the plating layer that is formed in the plating layer forming process and so as to maintain the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is more than a reference range, adjusting is performed so as to maintain the plating amount of the plating layer that is formed in the plating layer forming process and so as to decrease the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is less than a reference range, adjusting is performed so as to increase the plating amount of the plating layer that is formed in the plating layer forming process and so as to increase the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is within a reference range, adjusting is performed so as to increase the plating amount of the plating layer that is formed in the plating layer forming process and so as to maintain the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is within a reference range and the grinding amount information is more than a reference range, adjusting is performed so as to maintain the plating amount of the plating layer that is formed in the plating layer forming process and so as to decrease the grinding amount of the surface of the plating layer that is ground in the grinding process;   in a case where the second plating thickness information is within a reference range and the grinding amount information is less than a reference range, adjusting is performed so as to maintain the plating amount of the plating layer that is formed in the plating layer forming process and so as to increase the grinding amount of the surface of the plating layer that is ground in the grinding process; and   in a case where the second plating thickness information is within a reference range and the grinding amount information is within a reference range, adjusting is performed so as to maintain the plating amount of the plating layer that is formed in the plating layer forming process and the grinding amount of the surface of the plating layer that is ground in the grinding process.   
     
     
         4 . The method for producing a textured plated steel sheet according to  claim 1 , wherein,
 in the plating thickness determining process:   a thickness of the plating layer of the plated steel sheet at a time that is after the plating layer forming process and is before the grinding process is measured, and the thickness that is measured is adopted as the first plating thickness information.   
     
     
         5 . The method for producing a textured plated steel sheet according to  claim 1 , wherein,
 in the plating thickness determining process:   a thickness of the plating layer of the plated steel sheet after the grinding process is measured, and the thickness that is measured is adopted as the second plating thickness information.   
     
     
         6 . The method for producing a textured plated steel sheet according to  claim 1 , wherein:
 in the plating layer forming process, the plating layer is formed by the electroplating method; and   in the plating thickness determining process, the first plating thickness information is determined based on, in the plating layer forming process, a metal ion concentration in a plating solution, a line speed of the steel sheet into 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.   
     
     
         7 . The method for producing a textured plated steel sheet according to  claim 1 , wherein:
 in the plating layer forming process, the plating layer is formed by the hot-dip plating method; and   in the plating thickness determining process, the first plating thickness information is determined based on, in the plating layer forming process, a line speed of the steel sheet into a plating bath, an impact pressure of a wiping gas, and/or a rolling reduction at a skin pass mill.   
     
     
         8 . The method for producing a textured plated steel sheet according to  claim 1 , further comprising:
 a coating film forming process of forming a coating film of the surface of the plated steel sheet after the grinding process.   
     
     
         9 . The method for producing a textured plated steel sheet according to  claim 1 , further comprising:
 an appearance evaluating process of evaluating an appearance of the plated steel sheet after the grinding process based on a glossiness of the surface of the plated steel sheet after the grinding process.   
     
     
         10 . The method for producing a textured plated steel sheet according to  claim 9 , wherein:
 in the appearance evaluating process,   an appearance of the plated steel sheet is evaluated based on two glossinesses which are a glossiness of the surface of the plated steel sheet that is measured in a longitudinal direction of the plated steel sheet and a glossiness of the surface of the plated steel sheet that is measured in a sheet width direction of the plated steel sheet.   
     
     
         11 . The method for producing a textured plated steel sheet according to  claim 9 , wherein:
 in the adjusting process,   a plating amount of the plating layer that is formed in the plating layer forming process and a grinding amount of the surface of the plating layer that is ground in the grinding process are adjusted based on the first plating thickness information, the second plating thickness information, and a glossiness of the surface of the plated steel sheet after the grinding process.   
     
     
         12 . An apparatus for producing a textured plated steel sheet, comprising:
 a plating apparatus for performing hot-dip plating or electroplating to form a plating layer on a surface of a steel sheet to produce a plated steel sheet;   a grinding apparatus that is arranged downstream of the plating apparatus, and that grinds 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 apparatus that determines first plating thickness information relating to a thickness before the grinding of the plating layer, and outputs the first plating thickness information; and   a second plating thickness determination apparatus that is arranged downstream of the grinding apparatus, and that determines second plating thickness information relating to a thickness of the plating layer that has been ground, and outputs the second plating thickness information.   
     
     
         13 . The apparatus for producing a textured plated steel sheet according to  claim 12 , further comprising:
 a control unit that controls the plating apparatus and the grinding apparatus;   wherein the control unit:   controls the plating apparatus so as to adjust a plating amount of the plating layer that is formed on the surface of the steel sheet by the plating apparatus, based on the first plating thickness information and the second plating thickness information, and controls the grinding apparatus so as to adjust the grinding amount of the surface of the plating layer that is ground by the grinding apparatus, based on the first plating thickness information and the second plating thickness information.   
     
     
         14 . The apparatus for producing a textured plated steel sheet according to  claim 13 , wherein the control unit:
 determines grinding amount information that is information relating to the grinding amount at the grinding apparatus, based on the first plating thickness information and the second plating thickness information; and   controls the plating apparatus so as to adjust the plating amount of the plating layer that is formed on the surface of the steel sheet by the plating apparatus, based on the second plating thickness information and the grinding amount information, and controls the grinding apparatus so as to adjust the grinding amount of the surface of the plating layer that is ground by the grinding apparatus, based on the second plating thickness information and the grinding amount information.   
     
     
         15 . The apparatus for producing a textured plated steel sheet according to  claim 14 , wherein the control unit:
 in a case where the second plating thickness information is more than a reference range and the grinding amount information is more than a reference range, controls the plating apparatus so as to decrease the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to decrease the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is more than a reference range and the grinding amount information is less than a reference range, controls the plating apparatus so as to maintain the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to increase the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is more than a reference range and the grinding amount information is within a reference range, controls the plating apparatus so as to decrease the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to maintain the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is more than a reference range, controls the plating apparatus so as to maintain the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to decrease the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is less than a reference range, controls the plating apparatus so as to increase the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to increase the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is less than a reference range and the grinding amount information is within a reference range, controls the plating apparatus so as to increase the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to maintain the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is within a reference range and the grinding amount information is more than a reference range, controls the plating apparatus so as to maintain the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to decrease the grinding amount of the surface of the plating layer that is ground by the grinding apparatus;   in a case where the second plating thickness information is within a reference range and the grinding amount information is less than a reference range, controls the plating apparatus so as to maintain the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to increase the grinding amount of the surface of the plating layer that is ground by the grinding apparatus; and   in a case where the second plating thickness information is within a reference range and the grinding amount information is within a reference range, controls the plating apparatus so as to maintain the plating amount of the plating layer that is formed by the plating apparatus, and controls the grinding apparatus so as to maintain the grinding amount of the surface of the plating layer that is ground by the grinding apparatus.   
     
     
         16 . The apparatus for producing a textured plated steel sheet according to  claim 12 , further comprising:
 a coating film forming apparatus that is arranged downstream of the grinding apparatus, and that forms a coating film on the surface of the plating layer which has been subjected to the grinding.   
     
     
         17 . The apparatus for producing a textured plated steel sheet according to  claim 12 , further comprising:
 one or a plurality of gloss meters which are arranged downstream of the grinding apparatus, and which measure a glossiness of the surface of the plated steel sheet having the plating layer which has been subjected to the grinding.   
     
     
         18 . The apparatus for producing a textured plated steel sheet according to  claim 17 , wherein,
 the gloss meters are two gloss meters which are a gloss meter that measures a glossiness of the surface of the plated steel sheet in a longitudinal direction of the plated steel sheet and a gloss meter that measures a glossiness of the surface of the plated steel sheet in a sheet width direction of the plated steel sheet.   
     
     
         19 . The apparatus for producing a textured plated steel sheet according to  claim 17 , wherein the control unit:
 controls the plating apparatus so as to adjust the plating amount of the plating layer that is formed on the surface of the steel sheet by the plating apparatus, based on the first plating thickness information, the second plating thickness information, and the glossiness of the surface of the plated steel sheet, and controls the grinding apparatus so as to adjust the grinding amount of the surface of the plating layer that is ground by the grinding apparatus, based on the first plating thickness information, the second plating thickness information, and the glossiness of the surface of the plated steel sheet.