JP2018031049A - Production method and production equipment of directional electric steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method and a production equipment of directional electric steel sheet capable of controlling a depth of a groove formed on a surface of a directional electric steel sheet within a predetermined range.SOLUTION: The present invention is a production method of a directional electric steel sheet including a step of forming a linear groove on a surface of the directional electric steel sheet 1 by applying an electrolytic etching treatment after an etching mask is formed on the surface of the directional electric steel sheet 1, in which the electrolytic etching treatment is a treatment in which an electrode 42 is placed oppositely to the directional electric steel sheet 1 in an electrolytic tank 41 storing an electrolytic solution, and an etching treatment is applied on the surface of the directional electric steel sheet 1 by energizing between the directional electric steel sheet 1 and the electrode 42 via the electrolytic solution, and includes a step in which a shape of the directional electric steel sheet 1 before the electrolytic etching treatment is measured, and/or the depth of the linear groove is measured after the electrolytic etching treatment, and a distance between the directional electric steel sheet 1 and the electrode 42 is adjusted in response to the shape of the measured shape of the directional electric steel sheet and/or the depth of linear groove.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a grain-oriented electrical steel sheet and a manufacturing apparatus.

  Conventionally, a steel sheet is subjected to hot rolling, and then subjected to a local etching process after the cold rolling is performed once or two times with intermediate annealing, and then the final finishing annealing is performed, so that the steel sheet is grooved. There is known a method of manufacturing a grain-oriented electrical steel sheet that forms a sheet (see Patent Document 1). The etching method used in this manufacturing method includes a chemical etching method and an electrolytic etching method, but the electrolytic etching method can easily control the depth of the groove formed by the magnitude of the electrolytic current. This is advantageous. In this electrolytic etching method, generally, an insulating material such as ink is applied and baked on the surface of a steel plate as an etching mask in advance, and then an electrolytic etching process is performed, and then the etching mask is removed.

JP-A-63-42332

  In the conventional electrolytic etching method, the electrolytic etching process is performed while keeping the electrolytic current constant. At that time, the applied voltage is changed by the fluctuation of the distance between the steel plate and the electrode disposed opposite to the steel plate in the electrolytic bath. May fluctuate. Even when the distance between the steel plate and the electrode is controlled to be constant, the depth of the groove to be formed may vary. The inventors of the present invention conducted an extensive investigation of the cause of such a phenomenon, and found that the depth of the groove fluctuates due to a change in conductivity due to a change in the concentration of the electrolyte, a temperature change, or the like.

  When the applied voltage fluctuates, not only can the desired groove not be stably formed, but when the applied voltage increases, the etching mask loses its function by peeling off the etching mask, etc. Will also be etched. Since an insulating material used as an etching mask is expensive, it is desired to reduce the coating amount from the viewpoint of reducing manufacturing costs. However, if the coating amount of the insulating material is reduced unnecessarily, the insulation resistance decreases due to fluctuations in the applied voltage, and the function of the insulating material may be lost. For this reason, there is a limit to the amount of reduction in the amount of insulating material applied.

  The present invention has been made in view of the above problems, and its purpose is to produce a grain-oriented electrical steel sheet capable of controlling the depth of grooves formed on the surface of the grain-oriented electrical steel sheet within a predetermined range, and It is to provide a manufacturing apparatus.

  The inventors of the present invention have conducted extensive research to solve the above problems, and as a result, fluctuations in the electrolytic bath resistance due to changes in the distance between the steel sheet and the electrode caused by fluctuations in the applied voltage due to the shape of the steel sheet. In addition, the applied voltage is kept within a certain range by controlling the distance between the steel plate and the electrode according to the variation of the shape of the steel plate and the depth of the groove. It has been found that the electrolytic etching process can be performed stably. The present invention is based on the above findings.

  A method for producing a grain-oriented electrical steel sheet according to the present invention includes a step of forming a linear or dotted groove on a surface of a steel sheet by performing an electrolytic etching process after forming an etching mask on the surface of the steel sheet. In the method of manufacturing a steel plate, the electrolytic etching treatment is performed by placing an electrode opposite to the steel plate in an electrolytic tank storing an electrolytic solution, and energizing the steel plate and the electrode through the electrolytic solution. And etching the surface of the steel sheet, measuring the shape of the steel sheet before the electrolytic etching process, and / or measuring the depth of the groove after the electrolytic etching process, the measured The method includes a step of adjusting a distance between the steel plate and the electrode according to a shape of the steel plate and / or a depth of the groove.

  The method for producing a grain-oriented electrical steel sheet according to the present invention is the above-described invention, wherein the grain-oriented electrical steel sheet and the electrode at a measurement position closest to the electrode among the measurement positions of the shape in the width direction of the grain-oriented electrical steel sheet. And a step of controlling the distance to be a predetermined distance at which the etching mask is not destroyed by the applied voltage.

  In the above invention, the method for producing a grain-oriented electrical steel sheet according to the present invention is characterized in that, for each position in the width direction of the electrode, the steel sheet and the electrode according to the measured shape of the steel sheet and / or the depth of the groove. And adjusting the distance between the two.

  An apparatus for producing a grain-oriented electrical steel sheet according to the present invention produces a grain-oriented electrical steel sheet that forms linear or dotted grooves on the surface of the steel sheet by performing an electrolytic etching process after forming an etching mask on the surface of the steel sheet. In the electrolytic etching treatment, the electrode is disposed opposite to the steel plate in an electrolytic tank in which an electrolytic solution is stored, and the steel plate and the electrode are energized through the electrolytic solution, A process for etching the surface of the steel sheet, and means for measuring the shape of the steel sheet before the electrolytic etching process, and / or means for measuring the depth of the groove after the electrolytic etching process, and the measured Means for adjusting a distance between the steel plate and the electrode according to a shape of the steel plate and / or a depth of the groove.

  According to the method and apparatus for manufacturing a grain-oriented electrical steel sheet according to the present invention, the depth of the groove formed on the surface of the grain-oriented electrical steel sheet can be controlled within a predetermined range.

FIG. 1 is a schematic diagram showing a configuration of a continuous electrolytic etching apparatus for grain-oriented electrical steel sheets according to an embodiment of the present invention. FIG. 2 is a plan view showing an example of an etching mask formed on the grain-oriented electrical steel sheet. FIG. 3 is a schematic view showing a main part of the continuous electrolytic etching apparatus for the grain-oriented electrical steel sheet shown in FIG.

  Hereinafter, a manufacturing method and a manufacturing apparatus of a grain-oriented electrical steel sheet according to an embodiment of the present invention will be described with reference to the drawings.

  A method of manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention includes, for example, selectively forming an etching mask on the surface of a grain-oriented electrical steel sheet that has been cold-rolled to the final thickness, and then directing the orientation into the electrolytic cell. By continuously charging the electromagnetic steel sheet and subjecting it to an electrolytic etching treatment, linear or dotted (dot-line) grooves (hereinafter collectively referred to as linear grooves) are formed on the surface of the grain-oriented electrical steel sheet. Forming.

  FIG. 1 is a schematic diagram showing a configuration of a continuous electrolytic etching apparatus for grain-oriented electrical steel sheets according to an embodiment of the present invention. As shown in FIG. 1, a continuous electrolytic etching apparatus 100 used in a method of manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention includes an etching resist coating apparatus 2, a dry baking apparatus 3, an electrolytic etching apparatus 4, and an etching resist. A removal device 5, a rinsing tank 6, a rinse tank 7, a shape meter 8, and a groove depth detector 9 are provided. Moreover, the continuous electrolytic etching method of this embodiment performed by the continuous electrolytic etching apparatus 100 includes a mask forming step, a groove forming step, a shape measuring step and / or a groove depth measuring step, and a steel sheet-electrode adjusting step. .

[Mask formation process]
The mask formation step is a step of forming the etching mask 1a (see FIG. 2) while leaving the linear exposed portion 1b (see FIG. 2) on the surface 11 of the grain-oriented electrical steel sheet 1 cold-rolled to the final plate thickness. is there. The continuous electrolytic etching apparatus 100 includes an etching resist coating apparatus 2 and a dry baking apparatus 3 as mask forming apparatuses, and executes a mask forming process using the etching resist coating apparatus 2 and the dry baking apparatus 3. The continuous electrolytic etching apparatus 100 selectively forms an etching mask 1a (see FIG. 2) by applying an etching resist to the surface 11 of the grain-oriented electrical steel sheet 1 that has been cold-rolled to the final thickness, followed by drying and baking.

[Shape measurement process]
The shape measuring step is a step of measuring the shape of the grain-oriented electrical steel sheet 1 with a shape meter 8 arranged on the inlet side of the electrolytic etching apparatus 4. The shape (profile) in the width direction of the grain-oriented electrical steel sheet 1 is measured by this shape measuring step. According to the shape of the grain-oriented electrical steel sheet 1 measured in the shape measuring step, the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 is adjusted by a steel sheet-electrode adjusting process described later.

[Groove formation process]
In the groove forming step, the directional electromagnetic steel sheet 1 is brought into contact with the entrance-side conductor roll 43a and the exit-side conductor roll 43b in the electrolytic etching apparatus 4 and immersed in the electrolytic bath 46 to be disposed in the electrolytic bath 46. It is a process of forming a linear groove on the surface 11 of the grain-oriented electrical steel sheet 1 by performing an electroetching process for etching by energizing between the inlet-side conductor roll 43a and the outlet-side conductor roll 43b and the electrode 42. . The grain-oriented electrical steel sheet 1 in which the linear grooves are formed is cleaned in the washing tank 6 and the rinse tank 7 after the etching mask 1a (see FIG. 2) is removed from the surface 11 by the etching resist removing device 5.

[Groove depth measurement process]
The groove depth measuring step is a step of measuring the depth of the linear groove formed on the surface of the grain-oriented electrical steel sheet 1 by the groove depth detector 9 disposed on the outlet side of the electrolytic etching apparatus 4. By this groove depth measurement step, the depth of the linear groove at a predetermined position of the directional electromagnetic steel sheet 1, preferably the depth of the linear groove in the width direction of the directional electromagnetic steel sheet 1 is measured. In accordance with the depth of the linear groove measured in the groove depth measurement step, the distance between the grain-oriented electrical steel plate 1 and the electrode 42 is adjusted by a steel plate-electrode adjustment step described later.

[Steel plate-electrode adjustment process]
The adjustment step between the steel plate and the electrode includes the shape of the directional electromagnetic steel plate 1 measured by the shape meter 8 and / or the linear groove formed on the surface of the directional electromagnetic steel plate 1 measured by the groove depth detector 9. This is a step of adjusting the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 according to the depth. In the adjustment based on the shape, the electrode 42 is moved based on the obtained shape data so that the position of the electrode 42 becomes a predetermined position. For example, the etching mask 1a destroys the distance between the directional electromagnetic steel sheet 1 and the electrode 42 at the measurement position closest to the electrode 42 among the measurement positions of the shape in the width direction of the directional electromagnetic steel sheet 1 by the applied voltage. Feed forward control is performed so that a predetermined distance is not achieved. When the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 becomes small, the applied voltage may increase and the etching mask 1a may be destroyed. However, the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 is the shortest. By controlling the distance between the directional electromagnetic steel sheet 1 and the electrode 42 at the position, it is possible to suppress the destruction of the etching mask 1a (see FIG. 2) in the entire width direction of the directional electromagnetic steel sheet 1.

  In the adjustment based on the depth of the linear groove, the electrode 42 is moved so that the position of the electrode 42 becomes a predetermined position based on the obtained linear groove depth data. For example, when the linear groove depth is shallower than the target depth, the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 is shortened to increase the applied voltage, thereby increasing the linear groove depth. The depth of the linear groove can be controlled to the target depth. By controlling feedback of the measured depth of the linear groove to the distance between the directional electromagnetic steel sheet 1 and the electrode 42, the directional electromagnetic steel sheet 1 and the electrode 42, which change every moment depending on the concentration and temperature of the electrolyte, It is possible to optimize the substantial applied voltage between the two, and the accuracy of the shape of the linear groove can be improved. The adjustment of the distance between the directional electromagnetic steel sheet 1 and the electrode 42 based on the shape and the adjustment of the distance between the directional electromagnetic steel sheet 1 and the electrode 42 based on the depth of the linear groove are performed. Or both may be used in combination. Further, the electrode 42 is divided into a plurality of parts in the width direction, and the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 is adjusted based on the shape and / or the depth of the linear groove at each division position of the electrode 42. May be.

  Hereinafter, the manufacturing method of the grain-oriented electrical steel sheet which is one Embodiment of this invention is demonstrated.

  The grain-oriented electrical steel sheet 1 cold-rolled to the final plate thickness is subjected to an etching resist coating device 2, a dry baking device 3, an electrolytic etching device 4, an etching resist removing device 5, a washing tank 6, And the rinsing tank 7 in this order. The etching resist coating apparatus 2 applies an etching resist to the surface 11 of the grain-oriented electrical steel sheet 1. The etching resist coating apparatus 2 of the present embodiment applies an etching resist by gravure offset printing, leaving a linear exposed portion 1b (see FIG. 2) on the surface 11 of the grain-oriented electrical steel sheet 1.

  FIG. 2 is a plan view showing an example of an etching mask formed on the grain-oriented electrical steel sheet 1. As shown in FIG. 2, a strip-shaped etching mask 1a is formed on the surface 11 of the grain-oriented electrical steel sheet 1 leaving a linear exposed portion 1b. The exposed part 1b is inclined at a predetermined inclination angle θ with respect to the longitudinal direction (conveying direction) of the grain-oriented electrical steel sheet 1, for example. The width of the exposed portion 1b in the transport direction is d, and the width of the etching mask 1a in the transport direction is L.

  Returning to FIG. 1, the etching resist coating apparatus 2 includes a backup roll 2a, a gravure roll 2b, and a rubber transfer roll 2c. The rubber transfer roll 2c is disposed between the gravure roll 2b and the backup roll 2a, and is in contact with the rolls 2a and 2b. The gravure roll 2b has a recess corresponding to the shape of the etching mask 1a formed on the grain-oriented electrical steel sheet 1. The ink of the etching resist collected in the recess is transferred to the surface 11 of the grain-oriented electrical steel sheet 1 through the rubber transfer roll 2c.

  The rubber transfer roll 2c sandwiches the directional electromagnetic steel sheet 1 between the backup roll 2a and applies ink to the directional electromagnetic steel sheet 1 while pressing. The ink used as the etching resist is preferably a resist ink mainly composed of any one of alkyd resin, epoxy resin, and polyethylene resin. The dry baking apparatus 3 dries and burns the ink of the etching resist applied to the surface 11 of the grain-oriented electrical steel sheet 1. Thereby, the etching mask 1a (refer FIG. 2) is formed in the surface 11 of the grain-oriented electrical steel sheet 1 leaving the linear exposed part 1b (refer FIG. 2).

  FIG. 3 is a view showing a main part of the continuous electrolytic etching apparatus for the grain-oriented electrical steel sheet shown in FIG. As shown in FIG. 3, a shape meter 8 is disposed on the inlet side of the electrolytic etching apparatus 4. The shape meter 8 measures the shape (profile) in the width direction of the grain-oriented electrical steel sheet 1. Information on the position in the width direction of the grain-oriented electrical steel sheet 1 measured by the shape meter 8 is sent to the electrode position control device 10. The electrode position control device 10 controls the position of the electrode 42 based on the measurement result of the shape meter 8. Typically, the electrode position control device 10 has the smallest distance between the directional electromagnetic steel sheet 1 and the electrode 42 based on information on the position in the width direction of the directional electromagnetic steel sheet 1 acquired from the shape meter 8. Select the position in the width direction. Then, the electrode position control device 10 sets the electrode 42 so that the distance between the grain-oriented electrical steel sheet 1 and the electrode 42 at the selected width direction position is a distance at which a predetermined etching mask is not destroyed. It is moved in the vertical direction (direction away from the directional electromagnetic steel sheet 1). Instead of moving the electrode 42, the positions of the inlet-side sink roll 45 a and the outlet-side sink roll 45 b for making the directional electromagnetic steel sheet 1 face the electrode 42 in the electrolytic bath 46 are in the vertical direction (separated from the electrode 42. The distance between the grain-oriented electrical steel sheet 1 and the electrode 42 may be adjusted by moving in the direction).

  The electrolytic etching apparatus 4 includes an electrolytic etching tank 41, an electrode 42, an inlet side conductor roll 43a and an outlet side conductor roll 43b, an inlet side backup roll 44a and an outlet side backup roll 44b, an inlet side sink roll 45a and an outlet side sink roll 45b, An electrolytic bath 46 and a power source 47 are provided. The electrolytic etching apparatus 4 removes a part of the directional electrical steel sheet 1 by the entrance-side sink roll 45a and the exit-side sink roll 45b in a state where the entrance-side conductor roll 43a and the exit-side conductor roll 43b are in contact with the directional electrical steel sheet 1. The directional magnetic steel sheet 1 and the electrode 42 are opposed to each other between the inlet-side sink roll 45a and the outlet-side sink roll 45b. The electrolytic etching apparatus 4 energizes between the entrance-side conductor roll 43a and the exit-side conductor roll 43b and the electrode 42, and forms a linear groove on the surface 11 of the grain-oriented electrical steel sheet 1 by an electrolytic etching process.

  The electrolytic bath 46 is stored in the electrolytic etching tank 41. The electrolytic bath 46 is an electrolytic solution such as an aqueous NaCl solution or an aqueous KCl solution. The electrode 42 is disposed in the electrolytic bath 46. The inlet-side conductor roll 43 a and the outlet-side conductor roll 43 b, the inlet-side backup roll 44 a and the outlet-side backup roll 44 b are disposed above the liquid level of the electrolytic bath 46 in the electrolytic etching tank 41. The inlet-side conductor roll 43 a and the inlet-side backup roll 44 a are disposed on the inlet side in the electrolytic etching tank 41. The outlet side conductor roll 43 b and the outlet side backup roll 44 b are arranged on the outlet side in the electrolytic etching tank 41. The entrance-side conductor roll 43 a and the exit-side conductor roll 43 b are anodes that are in contact with the grain-oriented electrical steel sheet 1. When the directional electromagnetic steel sheet 1 is sandwiched between the inlet side conductor roll 43a and the inlet side backup roll 44a, the contact state between the directional electromagnetic steel sheet 1 and the inlet side conductor roll 43a is maintained. Further, the directional electromagnetic steel sheet 1 is sandwiched between the outlet side conductor roll 43b and the outlet side backup roll 44b, so that the contact state between the directional electromagnetic steel sheet 1 and the outlet side conductor roll 43b is maintained.

  The inlet-side sink roll 45a and the outlet-side sink roll 45b are immersed in the electrolytic bath 46, and the grain-oriented electrical steel sheet 1 is immersed in the electrolytic bath 46. In the electrolytic etching tank 41, the inlet-side sink roll 45a is disposed on the inlet side, and the outlet-side sink roll 45b is disposed on the outlet side. The grain-oriented electrical steel sheet 1 is conveyed through the electrolytic etching tank 41 while being wound around the inlet side backup roll 44a, the inlet side sink roll 45a, the outlet side sink roll 45b, and the outlet side backup roll 44b. The directional electromagnetic steel sheet 1 to be conveyed enters the electrolytic bath 46 between the inlet-side backup roll 44a and the inlet-side sink roll 45a, passes under the inlet-side sink roll 45a and the outlet-side sink roll 45b, and exits. The electrolytic bath 46 exits between the side sink roll 45b and the outlet side backup roll 44b.

The electrode 42 is a negative electrode that is paired with the inlet-side conductor roll 43a and the outlet-side conductor roll 43b. The electrode 42 is connected to the negative side of the power source 47, and the inlet side conductor roll 43 a and the outlet side conductor roll 43 b are connected to the anode side of the power source 47. In the electrolytic etching apparatus 4, a current circuit is configured through the power supply 47, the inlet side conductor roll 43 a and the outlet side conductor roll 43 b, the directional electromagnetic steel sheet 1, the electrolytic bath 46, and the electrode 42. The current density in the electrolytic etching process is preferably in the range of 1 to 100 [A / dm ² ]. If the current density in the electrolytic etching process is too low, a sufficient etching effect cannot be obtained. Conversely, if the current density is too high, the etching mask 1a (see FIG. 2) is damaged.

  As shown in FIG. 3, the flat electrode 42 is disposed in a position facing the surface 11 of the grain-oriented electrical steel sheet 1 in the electrolytic bath 46. More specifically, the electrode 42 is disposed below the grain-oriented electrical steel sheet 1 in the electrolytic bath 46, and the inlet-side sink roll 45a on the surface 11 of the grain-oriented electrical steel sheet 1 is connected to the outlet-side sink roll. Opposite the range up to 45b. Further, a groove depth detector 9 is arranged on the outlet side of the electrolytic etching apparatus 4. The groove depth meter detector 9 measures the depth of the linear groove formed on the surface of the grain-oriented electrical steel sheet 1.

  Information about the depth of the linear groove measured by the groove depth meter 9 is sent to the electrode position control device 10. The electrode position control device 10 controls the position of the electrode 42 based on the measurement result of the groove depth meter 9. Typically, the electrode position control device 10 controls the electrode 42 so that the linear groove depth becomes a predetermined target value based on the information about the linear groove depth acquired from the groove depth meter 9. It is moved in the vertical direction (direction away from the directional electromagnetic steel sheet 1). About this control amount, you may obtain | require beforehand the control amount used as a standard according to the kind of grain-oriented electrical steel sheet 1, or measure the depth of the linear groove after changing only a predetermined distance, An appropriate control amount may be obtained from the depth of the linear groove before and after the change of the distance between the grain-oriented electrical steel sheet 1 and the electrode 42. Instead of moving the electrode 42, the positions of the inlet-side sink roll 45 a and the outlet-side sink roll 45 b for making the directional electromagnetic steel sheet 1 face the electrode 42 in the electrolytic bath 46 are in the vertical direction (separated from the electrode 42. The distance between the grain-oriented electrical steel sheet 1 and the electrode 42 may be adjusted by moving in the direction).

  As is clear from the above description, the method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention provides a grain-oriented electromagnetic steel by performing an electrolytic etching process after forming an etching mask on the surface of the grain-oriented electrical steel sheet 1. A method of manufacturing a grain-oriented electrical steel sheet including a step of forming a linear groove on the surface of the steel sheet 1, wherein the electrolytic etching treatment is performed on an electrode with respect to the grain-oriented electrical steel sheet 1 in an electrolytic bath 41 storing an electrolytic bath 46. 42 is disposed to face each other, and the surface of the directional electromagnetic steel sheet 1 is etched by energizing between the directional electromagnetic steel sheet 1 and the electrode 42 through the electrolytic solution, and the directional electromagnetic steel sheet before the electrolytic etching process. 1 is measured, and / or the depth of the linear groove is measured after the electrolytic etching treatment, and the grain-oriented electrical steel sheet according to the measured shape of the grain-oriented electrical steel sheet and / or the depth of the linear groove. 1 and electrode 4 Since including the step of adjusting the distance between the can control the depth of the groove formed in the surface of the grain-oriented electrical steel sheet within a predetermined range.

  The embodiment to which the invention made by the present inventors is applied has been described above, but the present invention is not limited by the description and the drawings that constitute a part of the disclosure of the present invention. For example, as described above, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Directional electrical steel sheet 1a Etching mask 1b Exposed part 11 Surface 2 Etching resist coating apparatus 2a Backup roll 2b Gravure roll 2c Rubber transfer roll 3 Dry baking apparatus 4 Electrolytic etching apparatus 41 Electrolytic etching tank 42 Electrode 43a Inlet side conductor roll 43b Outlet side Conductor roll 44a Inlet side backup roll 44b Outlet side backup roll 45a Inlet side sink roll 45b Outlet side sink roll 46 Electrolytic bath 47 Power supply 5 Etching resist removal device 6 Flushing bath 7 Rinse bath 8 Shape meter 9 Groove depth detector 100 Continuous electrolysis Etching device

Claims (4)

A method for producing a grain-oriented electrical steel sheet including a step of forming a linear or dotted groove on a surface of a steel sheet by performing an electrolytic etching treatment after forming an etching mask on the surface of the steel sheet,
In the electrolytic etching treatment, an electrode is disposed opposite to the steel plate in an electrolytic tank storing an electrolytic solution, and an electric current is passed between the steel plate and the electrode through the electrolytic solution to etch the surface of the steel plate. Is the process of applying
Measure the shape of the steel plate before the electrolytic etching treatment and / or measure the depth of the groove after the electrolytic etching treatment, and depending on the measured shape of the steel plate and / or the depth of the groove. A method for producing a grain-oriented electrical steel sheet, comprising a step of adjusting a distance between the steel sheet and the electrode.   Among the measurement positions of the shape in the width direction of the grain-oriented electrical steel sheet, the distance between the grain-oriented electrical steel sheet and the electrode at the measurement position closest to the electrode is determined so that the etching mask is not destroyed by the applied voltage. The method for producing a grain-oriented electrical steel sheet according to claim 1, further comprising a step of controlling the distance to be equal to the distance.   The method includes adjusting the distance between the steel plate and the electrode according to the measured shape of the steel plate and / or the depth of the groove for each position in the width direction of the electrode. Item 3. A method for producing a grain-oriented electrical steel sheet according to Item 1 or 2. An apparatus for producing a grain-oriented electrical steel sheet that forms a linear or dotted groove on the surface of a steel sheet by applying an electrolytic etching treatment after forming an etching mask on the surface of the steel sheet,
In the electrolytic etching treatment, an electrode is disposed opposite to the steel plate in an electrolytic tank storing an electrolytic solution, and an electric current is passed between the steel plate and the electrode through the electrolytic solution to etch the surface of the steel plate. Is the process of applying
Means for measuring the shape of the steel sheet before the electrolytic etching treatment, and / or means for measuring the depth of the groove after the electrolytic etching treatment;
Means for adjusting the distance between the steel plate and the electrode according to the measured shape of the steel plate and / or the depth of the groove;
An apparatus for producing a grain-oriented electrical steel sheet, comprising:

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