JP4239233B2 - Manufacturing method of grain-oriented electrical steel sheet and etching mask forming apparatus for grain-oriented electrical steel sheet - Google Patents

Description

【００４０】
【表２】

【００４１】
表２から、本発明を適用した本発明例は、溝幅、溝深さのばらつきが少なく、したがって低鉄損で、かつ鉄損のばらつきが少ない方向性電磁鋼板となっている。一方、本発明を適用しない比較例では、溝幅、溝深さのばらつきが大きくなり、その結果鉄損のばらつきが大きくなっている。
【００４２】
【発明の効果】
本発明によれば、従来に比し、磁気特性のばらつきが少ない低鉄損方向性電磁鋼板を工業的に安定して製造することができ、しかも歪取り焼鈍による鉄損の劣化がないため、積鉄心、巻鉄心用として使用できるという効果を奏するものである。
【図面の簡単な説明】
【図１】本発明の１実施例であるエッチングマスク形成装置の概略説明図である。
【図２】本発明の１実施例である気体噴射方式のインキ溜まり除去手段の概略説明図である。
【図３】インキ掻き洩れ発生率と処理量の関係に及ぼすインキ溜まり除去の影響を示すグラフである。
【符号の説明】
１ エッチングマスク形成装置
２ 鋼板（鋼帯）
３ 焼付け装置
４ エッチングレジスト塗布装置
５ 鋼板温度調整装置
６ バックアップロール
７ グラビヤオフセットロール
８ グラビヤロール
９ エッチングレジストインキ供給槽
10 インキ温度調節手段
11 ドクターブレード
12 レジストインキ
13 インキ溜まり
14 インキ溜まり除去手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a low iron loss directional electrical steel sheet used as an iron core of an electrical device such as a transformer and an etching mask forming apparatus for introducing uniform linear grooves on the surface of the directional electrical steel sheet.
[0002]
[Prior art]
Oriented electrical steel sheets are mainly used as iron core materials for transformers and are required to have good magnetic properties. In particular, it is important that energy loss, that is, iron loss when used as iron cores is low. . In addition, there is a demand for grain-oriented electrical steel sheets that do not cause iron loss degradation even when strain relief annealing is performed.
[0003]
In response to such a demand, for example, Japanese Patent Publication No. 62-54873 discloses a phosphoric acid system in which linear grooves are locally formed in a finish-annealed steel sheet by laser or mechanical means, and the grooves are filled. A method for producing a low iron loss unidirectional electrical steel sheet to which a tension-applying film is applied has been proposed. However, with this method, it is difficult to remove the coating stably at all times, so it is not possible to form a stable groove. Especially when the groove is directly formed on the ground iron by mechanical means such as a knife, the periphery of the groove However, there is a problem that the coating rate is reduced due to the reduction of the space factor due to the occurrence of burr and the re-painting of the insulating coating is often required because the coating is damaged by the introduction of the groove.
[0004]
For such a problem, a method of introducing a linear groove in the final cold rolled sheet has been proposed. For example, Japanese Patent Laid-Open No. 63-42332 discloses an electrolytic etching method using photoetching or stencil. According to this method, there is no problem of repainting the insulating film, but in photoetching, the exposure state of ultraviolet light through the mask and the removal state of the exposed portion when immersed in the developer are kept uniform throughout the coil. Is difficult. Further, in the electrolytic etching using a stencil, there remains a problem that it is difficult to always introduce a constant groove due to the bleeding of the electrolytic solution.
[0005]
Further, JP-A-4-88121 discloses that after final cold rolling, an etching resist is applied by printing with a continuous or non-continuous linear non-applied part region remaining on the surface of the steel sheet, and after baking, etching is performed. There has been proposed a method for manufacturing a low iron loss electromagnetic steel sheet that is processed to form a linear groove on the steel sheet surface. Furthermore, Japanese Patent Laid-Open No. 6-108300 proposes a method for producing a low iron loss electromagnetic steel sheet in which a cold rolled steel sheet is wound around a roll surface and an etching resist is applied.
[0006]
[Problems to be solved by the invention]
However, according to the techniques described in JP-A-4-88121 and JP-A-6-108300, there is no problem of repainting the insulating coating, but there is a variation in the obtained product characteristics, particularly the iron loss value. There was a problem that occurred.
The present inventors considered that the variation in the iron loss value is due to the non-uniformity of the width and depth of the linear groove, and as a result of examining the factors affecting the width and depth of the linear groove, the width of the linear groove was determined. It was found that the depth is greatly influenced by the accuracy of the width (groove width) of the non-painted portion of the etching mask.
[0007]
Usually, after applying an etching resist to the surface of the steel sheet with a gravure offset printing device consisting of a gravure roll and a gravure offset roll engraved with irregularities on the surface and a backup roll around which the steel sheet is wound, an etching mask is formed by dry baking. ing.
In order to improve the accuracy of the groove width of the etching mask, it is first important not to cause printing disturbance of the etching resist, so the peripheral speeds of the gravure roll, gravure offset roll, and backup roll are controlled with high accuracy. To be done.
[0008]
In addition, when etching resist ink sagging occurs, the groove width of the etching mask changes, so it is important to reduce the sagging amount of the resist ink. Increasing the viscosity of the ink in order to reduce the amount of ink sag increases the ink concentration, which is disadvantageous economically. For this reason, measures are taken to adjust the viscosity of the etching resist ink to a constant value so that the sagging amount of the etching resist after application is constant.
[0009]
However, there is still a problem that the accuracy of the groove width of the etching mask is not improved and the variation of the iron loss value is not eliminated.
When applying the etching resist, a doctor blade is installed above the gravure roll at a predetermined interval to scrape off excess ink adhering to the gravure roll. However, there are many cases where the abrasion powder of the doctor blade gets caught in the doctor blade, the pressure balance in the width direction of the blade is lost, and the resist ink is scraped off and leaked, and an etching mask is formed at the place that should originally become a groove. There is a problem in that the linear grooves on the steel sheet surface after electrolytic etching become non-uniform and the variation of iron loss values increases.
[0010]
To solve this problem, a method of providing a filter in the resist ink circulation system or a method of removing it with a magnet can be considered, but these abrasion powders cannot be completely removed, and the groove of the etching mask still remains. There was a problem that the accuracy of the width was not improved and the variation of the iron loss value was not solved.
An object of the present invention is to advantageously solve the above-described problems and to provide a method for producing a low iron loss directional electrical steel sheet having low iron loss and less variation in iron loss. Specifically, the etching resist coating method is a method of manufacturing a grain-oriented electrical steel sheet that obtains low iron loss by forming a linear groove on the steel sheet surface by electrolytic etching and an etching mask formed by coating an etching resist. A first object is to propose a method for manufacturing a grain-oriented electrical steel sheet that is improved and has low iron loss and little variation in iron loss. The second object of the present invention is to propose an etching mask forming apparatus for a grain-oriented electrical steel sheet for forming an etching mask, which can improve the uniformity of the width and depth of the linear groove.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the present inventors diligently studied factors that affect the variation in the groove width of the etching mask. As a result, it has been found that even when the viscosity of the etching resist ink is adjusted to be constant, the groove width of the etching mask changes when the plate temperature of the electrical steel sheet to which the etching resist is applied varies. This is because the viscosity of the etching resist ink changes due to fluctuations in the steel plate temperature, the sagging amount of the etching resist ink changes, and the groove width of the etching mask changes. It has been found that it is an important factor in controlling variation.
[0012]
Furthermore, the present inventors have found that the groove width of the etching mask changes when scraping by the doctor blade occurs. This scraping by the doctor blade is greatly influenced by the ink pool on the lower surface of the doctor blade that is generated when the resist ink is scraped off, and when the ink pool increases, it is likely that foreign matters such as iron powder will be easily caught. .
[0013]
The present invention is configured based on the above-described knowledge.
That is, the present invention provides a steel sheet having a final thickness by hot rolling a grain-oriented electrical steel material and sandwiching one time or intermediate annealing twice or more cold rolling, and then selectively applying an etching resist on the surface of the steel sheet. After coating and drying and baking to form an etching mask, etching is performed to form linear or dotted grooves on the surface of the steel sheet, and then the etching mask is removed, followed by decarburization annealing and then final finish annealing. In the method of manufacturing a grain-oriented electrical steel sheet, the etching resist is applied by adjusting the temperature of the etching resist ink to a predetermined constant temperature so that the amount of dripping of the etching resist ink is kept constant. performing sheet temperature of the steel sheet before coating the viscosity of the etching resist ink was adjusted to a constant temperature in the range that does not vary A method for producing oriented electrical steel sheets towards you said and.
[0014]
Further, in the present invention, the etching resist is applied using a gravure roll or a gravure roll and a gravure offset roll, while removing an ink pool generated on a doctor blade having an appropriate amount of the etching resist ink attached to the gravure roll. It is preferred to do so.
Further, in the present invention, the etching resist is applied using a gravure roll or a gravure roll and a gravure offset roll, while removing an ink pool generated on a doctor blade having an appropriate amount of the etching resist ink attached to the gravure roll. And adjusting the temperature of the etching resist ink to a predetermined constant temperature so that the sagging amount of the etching resist ink is kept constant, and adjusting the plate temperature of the steel plate before applying the etching resist to the viscosity of the etching resist ink. It is preferable to adjust the temperature so that the temperature does not vary .
[0015]
In the present invention, the ink reservoir is preferably removed by gas blowing.
Further, the second aspect of the present invention is an etching mask forming method for a grain-oriented electrical steel sheet having an etching resist coating apparatus for coating an etching resist on the surface of the grain-oriented electrical steel sheet and a baking apparatus for drying and baking the etching resist to form an etching mask In the apparatus, a steel plate temperature adjusting device for adjusting the plate temperature of the grain-oriented electrical steel plate to a constant temperature within a range in which the viscosity of the etching resist ink does not fluctuate is disposed on the entry side of the etching resist coating device, and further the etching resist The coating apparatus includes a backup roll for winding the directional electromagnetic steel sheet, a gravure roll or an offset roll and a gravure roll for applying an etching resist on the surface of the directional electromagnetic steel sheet, and an etching resist ink for supplying the gravure roll. Registrai Key and a supply tank, the said etching resist ink supply tank, the ink temperature control for adjusting the temperature of the etching resist ink to be supplied to a predetermined constant temperature as sag amount of the etching resist ink is kept constant An etching mask forming apparatus for grain-oriented electrical steel sheet, characterized in that means are provided.
[0016]
In the second aspect of the present invention, the etching resist coating apparatus includes a backup roll for winding the directional electromagnetic steel sheet, and a gravure roll, a gravure roll, and a gravure offset roll for applying an etching resist to the surface of the directional electromagnetic steel sheet. And an etching resist ink supply tank for supplying an etching resist ink to the gravure roll, and a doctor knife for adjusting the amount of the etching resist ink that is disposed at a predetermined interval from the gravure roll and adheres to the roll surface. In addition, the doctor knife is preferably provided with an ink pool removing means for removing the generated ink pool.
[0017]
In the second aspect of the present invention, a steel plate temperature adjusting device for adjusting the plate temperature of the grain-oriented electrical steel plate to a constant temperature within a range in which the viscosity of the etching resist ink is not changed is provided on the entry side of the etching resist coating device. The etching resist coating apparatus includes a backup roll for winding the grain-oriented electrical steel sheet, a gravure roll or a gravure roll and a gravure offset roll for coating an etching resist on the surface of the grain-oriented electrical steel sheet, and etching on the gravure roll. An etching resist ink supply tank for supplying the resist ink, and a doctor knife for adjusting the amount of the etching resist ink that is disposed at a predetermined interval from the gravure roll and adheres to the roll surface; Ink reservoir that removes generated ink reservoir Ri removal means is attached, further an ink temperature adjusting means for adjusting a predetermined constant temperature as sag amount of the etching resist ink the temperature of the etching resist ink to be supplied to the etch resist ink supply tank is kept constant It is preferable to have.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An etching resist is selectively applied to the surface of the grain-oriented electrical steel sheet that has been cold-rolled to the final thickness, followed by drying and baking to selectively form an etching mask.
In the present invention, the etching resist is applied after the steel plate temperature is adjusted to a predetermined constant temperature. Furthermore, in the present invention, the temperature of the etching resist ink used for applying the etching resist is adjusted to a predetermined constant temperature so that the sagging amount of the etching resist ink is kept constant.
[0019]
The sagging amount D of the etching resist ink is D = k (Q / ρ) t ^1/2 , (ρ: viscosity of the etching resist ink, Q: coating amount, t: time from coating to drying, k: constant) expressed. If the viscosity ρ of the etching resist ink is large, the sagging amount D is small. By adjusting the temperature of the etching resist ink to a constant temperature, the viscosity of the etching resist ink becomes constant, and the sagging amount of the etching resist ink is kept constant. In order to adjust the temperature of the etching resist ink to a constant temperature, it is preferable to circulate the etching resist ink and adjust and maintain the etching resist ink at a predetermined constant temperature in the middle of the etching resist ink.
[0020]
Further, in the present invention, the steel plate before application of the etching resist is adjusted to a constant temperature in a range that does not change the viscosity of the etching resist ink . Adjusted steel sheet temperature shall be the constant temperature range the viscosity is temperature adjusted not alter the viscosity of the etching resist ink was constant. The steel plate temperature and the ink temperature do not necessarily need to be adjusted to the same constant temperature, but are more preferably the same from the viewpoint of fluctuations in the viscosity of the resist ink.
[0021]
By doing so, there is no variation in the viscosity of the etching resist ink, and therefore the amount of sagging of the etching resist ink becomes constant, and the accuracy of the groove width of the etching mask is stabilized. Only after the steel plate temperature is adjusted to a constant temperature and the ink temperature is also adjusted to a constant temperature, the accuracy of the groove width of the etching mask is improved, and variations in the groove width and groove depth of the linear grooves are reduced. Thereby, the effect that the variation of an iron loss value decreases is produced.
[0022]
The etching resist may be applied to the surface of the steel plate by gravure printing in which an etching resist ink is supplied continuously to the gravure roll and transferred to the surface of the steel plate. However, the steel plate is wound around the backup roll 6 and the gravure roll is applied to the surface of the steel plate. 8 and offset roll 7 may be used for gravure offset printing. However, gravure offset printing is suitable because the wear of the plate cylinder is small, the resist thickness is easily controlled, and a stable printing surface is obtained.
[0023]
The etching resist ink is applied on the surface of the steel plate so that the non-ink-applied portion remains linearly or in a dot shape in a direction perpendicular to the rolling direction. 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 gravure roll is preferably provided with a doctor blade that adjusts the amount of etching resist ink that is disposed at a predetermined interval from the gravure roll and adheres to the roll surface.
[0024]
Moreover, in this invention, an etching resist is apply | coated, removing the ink reservoir which generate | occur | produces in a doctor blade. By removing the ink reservoir, foreign matter such as iron powder is less likely to be caught in the etching resist ink, and the occurrence of ink scraping in the doctor blade is reduced. Thereby, the groove width in the steel sheet width direction in the etching mask becomes uniform, and the groove width of the linear groove formed on the steel sheet surface becomes uniform. A grain-oriented electrical steel sheet having low iron loss and little variation in iron loss can be stably produced.
[0025]
The removal of the ink pool generated in the doctor blade may be performed alone, but it is more preferable to perform it together with the adjustment of the steel sheet temperature and the temperature adjustment of the etching resist ink.
After applying an etching resist, it is dried and baked to form an etching mask. After the etching mask is formed, an etching process is performed to form linear or dotted grooves on the steel sheet surface. Etching may be either chemical etching or electrolytic etching. In the case of electrolytic etching, it is preferable to perform in an electrolytic bath such as NaCl aqueous solution or KCl aqueous solution.
[0026]
After the etching, the etching mask is removed. The method for removing the etching mask is not particularly limited, but an alkali or an organic solvent is suitable.
After removing the etching mask, decarburization annealing is performed, and an annealing separator is applied, followed by final finish annealing. After finish annealing, the annealing separator is removed and an insulating coating is applied to make a product plate.
[0027]
Next, FIG. 1 shows an outline of an etching mask forming apparatus for grain-oriented electrical steel sheets according to an embodiment of the present invention. The apparatus of the present invention will be described with reference to FIG.
An etching mask forming apparatus 1 according to the present invention includes an etching resist coating apparatus 4 that applies an etching resist to the surface of a steel plate 2 and a baking apparatus 3 that dry-bakes the etching resist to form an etching mask.
[0028]
The etching resist coating apparatus 4 includes a backup roll 6 around which the steel plate 2 is wound, a gravure offset roll 7 and a gravure roll 8 or a gravure roll 8 (only the gravure roll is not shown), And an etching resist ink supply tank 9 for continuously supplying the etching resist ink to the roll.
[0029]
Further, the gravure roll 8 is provided with a doctor blade 11 which is arranged at a predetermined interval from the gravure roll 8 and adjusts the amount of etching resist ink adhering to the roll surface.
In the etching mask forming apparatus of the present invention, the temperature of the etching resist ink 12 supplied to the gravure roll 8 in the etching resist ink supply tank 9 is adjusted to a predetermined constant temperature at which the amount of etching resist droop is kept constant. Adjustment means 10 is attached.
[0030]
The etching resist ink 12 is circulated between the etching resist ink supply tank 9 and the ink temperature adjusting means 10, and is adjusted and held at the predetermined constant temperature described above . As the ink temperature adjusting means 10, any ordinary temperature adjusting means can be applied. Of these, temperature control means such as an electrothermal heating method and a heat exchange method are preferable.
Further, in the etching mask forming apparatus 1 of the present invention, in addition to the ink temperature adjusting means 10 attached to the etching resist ink supply tank 9, the plate temperature of the steel plate 2 is set on the entrance side of the etching resist coating apparatus 4 with the etching ink. A steel plate temperature adjusting device 5 for adjusting the temperature to a constant temperature within a range that does not change the viscosity is provided.
[0031]
The steel plate temperature adjusting device 5 is not particularly limited as long as the temperature of the steel plate can be set to the predetermined constant temperature described above before applying the etching resist, and the method is not particularly limited, but hot or cold air is blown to the steel plate. It is preferable to use a method of attaching, a method of disposing an electric heating plate, an induction heating method, or the like. In order to adjust the steel plate temperature with higher accuracy, it is preferable that the backup roll 6 of the etching resist coating apparatus 4 is a water-cooled roll. By using the backup roll 6 as a water-cooled roll, the steel plate temperature at the time of applying the etching resist can be adjusted with higher accuracy.
[0032]
In the etching mask forming apparatus of the present invention, the doctor blade 11 is disposed at a predetermined interval on the gravure roll in order to make the etching resist ink adhering to the surface of the gravure roll 8 an appropriate amount. Further, the arranged doctor blade 11 is preferably provided with an ink reservoir removing means 14 for removing the ink reservoir 13 generated on the doctor blade 11. The ink reservoir removing means 14 is preferably a nozzle that ejects gas.
[0033]
An example of the ink pool removing means is shown in FIG. FIG. 2 shows an example in which a gas ejection nozzle that ejects gas is used as the ink pool removing means 14.
It is preferable that the ink pool removing means (gas jet nozzles) are arranged at equal intervals in the width direction of the doctor blade 11 and jets the gas toward the ink pool 13 on the lower surface of the blade 11 with a constant pressure. By removing the ink reservoir by the ink reservoir removing means 14, the occurrence of ink scraping by the doctor blade 11 is reduced.
[0034]
By removing the ink reservoir 13 using the gas jet nozzle as the ink reservoir removing means 14, the occurrence of ink scraping by the blade is reduced as compared with the case where the ink reservoir is not removed as shown in FIG. As shown in FIG. 3, when ink pool removal is not performed, the occurrence rate of scraping by the doctor blade increases as the processing amount by the doctor blade increases. The effect of preventing ink scraping by the gas jet nozzle can be expected in the range of blade thickness of 0.10 to 0.30 mm, blade pressing force of 50 to 200 kgf, and blade pressing angle of 40 to 100 °. Outside this range, the effect of preventing ink scraping is reduced.
The baking apparatus 3 for drying and baking the applied etching resist and using it as an etching mask is not particularly limited as long as the temperature can be raised to a temperature (up to 200 ° C.) for drying and baking the etching resist. In addition, as a heating means, a hot air system, an electric heating system, etc. are suitable.
[0035]
In the present invention, the target electrical steel sheet is preferably an electrical steel sheet containing 2.5 to 4.5 wt% of Si. In addition to Si, a composition containing 0.03 to 0.08 wt% of C and a small amount of one or more of Mn, S, Se, Al and the like as an inhibitor is preferable. In addition to the above, the inhibitor may contain Sb, Bi, Cu, Sn and the like.
The slab adjusted to the above composition is hot-rolled, and then subjected to hot-rolled sheet annealing as necessary, and then the final sheet thickness is obtained by one or more cold rolling sandwiching intermediate annealing.
[0036]
After removing the etching mask, decarburization annealing is performed, and an annealing separator is applied, followed by final finish annealing. After finish annealing, the annealing separator is removed, and if necessary, a top coating is applied to make a product plate.
[0037]
【Example】
C: 0.06 wt%, Si: 3.2 wt%, Mn: 0.07 wt%, Al: 0.02 wt%, Se: 0.02 wt%, and N: 0.009 wt%, Sb: 0.02 wt%, the balance Fe and inevitable The impurity silicon steel slab was hot-rolled and annealed at 1000 ° C. for 1 min and then cold-rolled to form a cold-rolled sheet having a thickness of 0.23 mm. An etching mask was formed on the cold-rolled plate surface by the etching resist mask forming apparatus shown in FIG. The steel plate temperature before etching resist application is adjusted by the steel plate temperature adjusting device of the etching resist mask forming device, and the temperature of the etching resist ink supplied to the gravure roll is further adjusted by the ink temperature adjusting means, or further the gas jet type ink The ink pool generated on the doctor blade was removed by the pool removing means, and the example of the present invention was obtained. Table 1 shows the conditions for adjusting the steel sheet temperature and the etching resist ink temperature. On the other hand, a steel plate on which an etching mask was formed without adjusting the steel plate temperature, adjusting the ink temperature, and removing the ink reservoir was used as a comparative example.
[0038]
The steel plate on which the etching mask was formed was then subjected to electrolytic etching in a 20% NaCl aqueous solution, and linear grooves having a groove width of 100 μm and a groove depth of 25 μm were introduced on the steel plate surface.
After the electrolytic etching, the steel plate from which the etching mask was removed was further subjected to decarburization annealing and final finish annealing to obtain a product. For each product, the magnetic properties were measured at 10 locations, and the average value of iron loss and its variation were measured. Note that the groove depth of the linear groove and the variation of the groove depth were also measured. These results are shown in Table 2.
[0039]
[Table 1]

[0040]
[Table 2]

[0041]
From Table 2, the present invention example to which the present invention is applied is a grain-oriented electrical steel sheet with little variation in groove width and depth, and thus low iron loss and little variation in iron loss. On the other hand, in the comparative example to which the present invention is not applied, the variation of the groove width and the groove depth is increased, and as a result, the variation of the iron loss is increased.
[0042]
【The invention's effect】
According to the present invention, it is possible to industrially stably produce a low iron loss directional electrical steel sheet with less variation in magnetic properties than in the past, and there is no deterioration of iron loss due to strain relief annealing. This has the effect that it can be used as a steel core or wound core.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of an etching mask forming apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic explanatory diagram of a gas ejection type ink pool removing unit according to an embodiment of the present invention.
FIG. 3 is a graph showing the effect of ink pool removal on the relationship between ink scraping occurrence rate and processing amount.
[Explanation of symbols]
1 Etching mask forming device 2 Steel plate (steel strip)
DESCRIPTION OF SYMBOLS 3 Baking apparatus 4 Etching resist coating apparatus 5 Steel plate temperature control apparatus 6 Backup roll 7 Gravure offset roll 8 Gravure roll 9 Etching resist ink supply tank
10 Ink temperature control means
11 Doctor blade
12 Resist ink
13 Ink reservoir
14 Ink pool removal means

Claims (7)

A direction-oriented electrical steel material is hot-rolled and sandwiched by one or intermediate annealing to form a steel plate having a final thickness by cold rolling at least twice, and then an etching resist is selectively applied to the surface of the steel plate and dried and baked. After forming the etching mask, the grain-oriented electrical steel sheet is subjected to etching treatment to form linear or dotted grooves on the steel sheet surface, and then the etching mask is removed, followed by decarburization annealing and then final finish annealing. In the manufacturing method of
The application of the etch resist, the temperature of the etching resist ink as sag amount of the etching resist ink is held constant, while adjusting to a predetermined constant temperature, the plate temperature of the steel sheet before the etching resist coating method for producing oriented electrical steel sheets towards you, characterized in that the viscosity of the etching resist ink performed by adjusting a certain temperature range that does not vary. A direction-oriented electrical steel material is hot-rolled and sandwiched by one or intermediate annealing to form a steel plate having a final thickness by cold rolling at least twice, and then an etching resist is selectively applied to the surface of the steel plate and dried and baked. After forming the etching mask, the grain-oriented electrical steel sheet is subjected to etching treatment to form linear or dotted grooves on the steel sheet surface, and then the etching mask is removed, followed by decarburization annealing and then final finish annealing. In the manufacturing method of
The etching resist is applied using a gravure roll or a gravure roll and a gravure offset roll while removing an ink reservoir generated on a doctor blade having an appropriate amount of the etching resist ink adhering to the gravure roll. method of manufacturing oriented electrical steel sheet towards that. A direction-oriented electrical steel material is hot-rolled and sandwiched by one or intermediate annealing to form a steel plate having a final thickness by cold rolling at least twice, and then an etching resist is selectively applied to the surface of the steel plate and dried and baked. After forming the etching mask, the grain-oriented electrical steel sheet is subjected to etching treatment to form linear or dotted grooves on the steel sheet surface, and then the etching mask is removed, followed by decarburization annealing and then final finish annealing. In the manufacturing method of
While applying the etching resist, a gravure roll or a gravure roll and a gravure offset roll are used, while removing an ink reservoir generated in a doctor blade having an appropriate amount of the etching resist ink adhering to the gravure roll, and the etching resist ink The temperature of the etching resist ink is adjusted to a predetermined constant temperature so that the sagging amount of the etching resist ink is kept constant, and the plate temperature of the steel plate before applying the etching resist is constant within a range in which the viscosity of the etching resist ink does not fluctuate. method for producing oriented electrical steel sheets towards you and performing by adjusting the temperature. Method for producing oriented electrical steel sheet towards the claim 2 or 3, characterized in that the blowing gas the removal of the ink reservoir. An etching mask forming apparatus for a directional electrical steel sheet, comprising: an etching resist coating apparatus that applies an etching resist to a surface of a grain oriented electrical steel sheet; and a baking apparatus that uses the etching resist as a mask by drying and baking the etching resist. A steel plate temperature adjusting device that adjusts the plate temperature of the grain-oriented electrical steel sheet to a constant temperature within a range that does not change the viscosity of the etching resist is disposed on the entry side, and the etching resist coating device further includes the grain-oriented electrical steel plate. A backup roll to be wound, a gravure roll or an offset roll and a gravure roll for applying an etching resist on the surface of the grain-oriented electrical steel sheet, and an etching resist ink supply tank for supplying an etching resist ink to the gravure roll, Etch The grayed resist ink supply tank, wherein the ink temperature adjusting means for adjusting the temperature of the etching resist ink to be supplied to a predetermined constant temperature as sag amount of the etching resist ink is held constant annexed Etching mask forming device for grain-oriented electrical steel sheet.   In an etching mask forming apparatus for a directional electromagnetic steel sheet comprising an etching resist coating apparatus for applying an etching resist to the surface of a grain oriented electrical steel sheet and a baking apparatus for drying and baking the etching resist to form an etching mask, A backup roll for winding the directional electromagnetic steel sheet, a gravure roll or gravure roll and gravure offset roll for applying an etching resist on the surface of the directional electromagnetic steel sheet, and an etching resist ink supply for supplying an etching resist ink to the gravure roll A tank, and a doctor knife that adjusts the amount of etching resist ink that is disposed at a predetermined interval from the gravure roll and adheres to the roll surface, and the doctor knife has an ink reservoir that is generated. Etching mask forming apparatus oriented electrical steel sheet ink collecting removing means removed by it is characterized in that it is attached. An etching resist coating apparatus comprising: an etching resist coating apparatus that applies an etching resist to a surface of a grain-oriented electrical steel sheet; and a baking apparatus that uses the etching resist as a mask by drying and baking the etching resist. A steel plate temperature adjusting device for adjusting the plate temperature of the grain-oriented electrical steel sheet to a constant temperature within a range that does not fluctuate the etching resist is disposed on the side, and the etching resist coating apparatus winds the grain-oriented electrical steel plate A back-up roll, a gravure roll or gravure roll and gravure offset roll for applying an etching resist to the surface of the grain-oriented electrical steel sheet, an etching resist ink supply tank for supplying an etching resist ink to the gravure roll, and the gravure roll And a doctor knife that adjusts the amount of etching resist ink that is disposed at a predetermined interval and adheres to the roll surface, and the doctor knife is provided with an ink pool removing means that removes the generated ink pool, Further, there is provided an ink temperature adjusting means for adjusting the temperature of the etching resist ink supplied to the etching resist ink supply tank to a predetermined constant temperature so that the sagging amount of the etching resist ink is kept constant. Etching mask forming device for heat-resistant electrical steel sheet.

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