JP6524764B2 - Method of manufacturing laminated core - Google Patents

Description

  The present invention relates to a method of manufacturing a laminated core used in an electromagnetic conversion device such as a motor, a generator, or a transformer. More specifically, the present invention relates to a method of manufacturing a laminated core having a structure in which single plates are insulated.

  Conventionally, in a laminated core formed by laminating electromagnetic steel sheets, insulation between veneers is attempted. This is because the eddy current loss is large when the single plates are conducted. For this reason, it is common to apply an insulating coating to the surface of a veneer. Therefore, for example, in Patent Document 1, alkoxysilane is applied to the surface of the magnetic steel sheet. The hydrolysis of alkoxysilane forms a glassy insulating film on the surface of the magnetic steel sheet.

JP-A-4-323382

  However, the above-described conventional techniques have the following problems. In order to laminate electromagnetic steel sheets into a laminated core, it is necessary to cut out the electromagnetic steel sheets into the shape of a single sheet of laminated iron core. This cutting is usually by punching. On the other hand, in the technology of Patent Document 1, the insulating coating is formed on the magnetic steel sheet itself. Therefore, punching is performed on the magnetic steel sheet after the formation of the insulating film. For this reason, the insulating coating may be damaged in each laminated single plate. Where the insulation coating is damaged, the insulation between veneers will be insufficient. In addition, some bonding process is required to unify the single plate laminate, and the process is complicated.

  Moreover, although caulking and welding are often used as the joining process, the characteristics as a laminated iron core will be impaired also by these processes. This will be briefly described with reference to FIGS. 1 and 2. FIG. 1 shows a cross-sectional view of a laminated body of the magnetic steel sheet 1 joined by caulking with a caulking punch 90. In this state, a part of the insulating layer 4 is pushed out at a location where the crimping is performed to form a fragment 91 and is present in the electromagnetic steel sheet 1. At the crimped portion, a short circuit portion 92 between the magnetic steel plates 1 is also generated. As a result, iron loss occurs due to the short circuit portion 92, and the magnetic characteristics are impaired due to the fragments 91. FIG. 2 shows a cross-sectional view in a state in which the laminated body of the magnetic steel sheet 1 is joined by welding. In this state, iron loss occurs due to welding marks 93.

  The present invention has been made to solve the problems of the above-described conventional techniques. That is, it is an object of the present invention to provide a method of manufacturing a laminated core in which reliable insulation between veneers is obtained and which does not require a separate bonding step.

In the method of manufacturing a laminated core according to one aspect of the present invention, the insulating layer is formed by hardening the electromagnetic steel sheet into a single-plate shape of the laminated core by punching and punching into a single-plate electromagnetic steel sheet punched in the punching step. Forming an unhardened insulating material, laminating the electromagnetic steel sheets coated with the insulating material on the surface in the coating step, laminating the electromagnetic steel sheets laminated in the laminating step The laminated core is manufactured by curing the insulating material in the body to form an insulating layer. In this case the coating process, as the insulating material, Rutotomoni using glass forming materials to form a glass, the amount of the glass forming material, but spread throughout the plate surface of an electromagnetic steel sheet until it is subjected to a curing process An amount that does not exude to the end face, or an amount that spreads over the entire surface of the electromagnetic steel sheet before being subjected to the hardening step and also covers the end face. In the curing step, the laminated body of the magnetic steel sheets laminated in the laminating step is heated to vitrify the glass forming material coated in the coating step with heat.

In the method of manufacturing a laminated core according to the above-described embodiment, each step after the coating step is performed on the electromagnetic steel sheet that has a single plate shape of the laminated core in the punching step. Therefore, no mechanical stress is subsequently applied to the insulating layer formed by curing of the insulating material (glass forming material) supplied in the coating step. As a result, it is possible to obtain a laminated core having no defects in the insulating layer and reliable insulation between the magnetic steel sheets. Further, in the heating step, the insulating layer (the layer of glass) is formed by curing (vitrifying) the insulating material, and thereby, the electromagnetic steel sheets are also joined.

Further in the above production method, in the coating step, it is preferable intends rows coated by mist.

  In the method of manufacturing a laminated core according to the above aspect, it is also preferable to coat the magnetic steel sheet with the insulating material mixed with the particles of the solid insulating material in the coating step. In this case, the particle diameter of the solid insulator defines the minimum thickness of the insulating layer in the laminate of the magnetic steel sheets. In that case, it is preferable to harden the insulating material while pressing the laminated body of the magnetic steel sheets laminated in the laminating step in the thickness direction in the hardening step. By doing this, the thickness of the insulating layer in the laminate of the magnetic steel sheets can be better managed.

  According to this configuration, there is provided a method of manufacturing a laminated core, in which reliable insulation between single plates is obtained and which does not require a separate bonding step.

(Conventional example) It is sectional drawing of the laminated body of the electromagnetic steel plate joined by crimping. (Conventional Example) FIG. 7 is a cross-sectional view of a laminated body of electromagnetic steel plates joined by welding. It is a fragmentary sectional view of a laminated core manufactured by an embodiment. It is a perspective view of the laminated core manufactured by embodiment. (Comparative example) It is a partial cross-sectional view of a laminated core manufactured by a conventional method. It is sectional drawing which shows the structure of the apparatus used for the manufacturing method which concerns on embodiment. It is a perspective view (the 1) which shows the state which sprayed the glass formation material at a coating (spray) process. It is a perspective view (the 2) which shows the state which sprayed the glass formation material at a coating (spray) process. It is a fragmentary sectional view of the laminated core manufactured through the application (spray) process of FIG. It is a perspective view (the 3) which shows the state which sprayed the glass formation material at the coating (spray) process. It is a perspective view of the laminated iron core manufactured through the coating (spray) process of FIG. It is a fragmentary sectional view (the 1) of a laminated iron core which compounded granular glass in a glass layer. It is a fragmentary sectional view (the 2) of a laminated iron core which blended granular glass in a glass layer. It is a block diagram of the apparatus which implements continuously the manufacturing method which concerns on embodiment. It is a conceptual diagram which shows the procedure of manufacture of the laminated iron core by the apparatus of FIG. It is a schematic diagram of coating of the insulating material by liquid jet. It is a schematic diagram of application of the insulating material by a drop. It is a schematic diagram of coating of the insulating material by die coating. It is a schematic diagram of coating of the insulating material by roll coating. It is a schematic diagram of application of the insulating material by blade coating. It is a schematic diagram of application of the insulating material by spin coating. It is a schematic diagram of coating of the insulating material by dipping. It is a schematic diagram of the hardening process by a sol gel method. It is a schematic diagram of the hardening process by a pressure hardening method. It is a schematic diagram of the hardening process by the photocuring method. It is a schematic diagram of the hardening process by the thermosetting method in a heating furnace. It is a schematic diagram of the hardening process by the thermosetting method using a hot air. It is a schematic diagram of the hardening process by the thermosetting method using current heating. It is a schematic diagram of the hardening process by the thermosetting method which uses high frequency heating.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In this embodiment, a laminated iron core used for an electromagnetic conversion device such as a motor, a generator, or a transformer is manufactured by using a magnetic steel sheet as a main raw material. The manufacture of a laminated core in this embodiment follows the following procedure.
1. Punching process ↓
2. Coating process ↓
3. Stacking process ↓
4. Curing process

  The above-mentioned "1." punching process is a process of punching out a single plate of laminated iron core from a base plate of a magnetic steel sheet. This process itself is a process according to a known method. There are various types of electromagnetic steel sheets, but the present invention is not particularly limited as to the type of electromagnetic steel sheets. Any electromagnetic steel sheet of a type selected according to the characteristics of the laminated core to be manufactured may be used.

  The coating process of said "2." is a process of coating the material for forming an insulating film on the surface of a magnetic steel sheet. In this step, coating is performed on the surface of the single-plate-shaped electromagnetic steel sheet in the form of a laminated core punched out in the punching step. Coating may be performed only on one side of the magnetic steel sheet, but may be performed on both sides. The coating material to be coated is in the form of liquid or paste, and is an insulating layer forming material which is cured by heat treatment or other post-treatment to be an insulating layer.

Here, an example using a spray as a specific method of coating is given. As a coating material, the glass formation material which forms glass by heat processing shall be used. Orthosilicate (Si (OR) ₄ : R is a suitable organic group) and water are used as glass forming materials. It is because glass is formed by hydrolysis of the orthosilicate compound. This is based on the following reaction if tetraethyl orthosilicate (Si (OC ₂ H ₅ ) ₄ , hereinafter referred to as “TEOS”), which is the most easy to use among ortho silicate compounds, is mentioned as an example.
Si (OC ₂ H ₅ ) ₄ + 2H ₂ O → SiO ₂ + 4C ₂ H ₅ OH

  Among the products, silica is a glass constituting a solid insulating coating. Ethanol escapes as a gas and does not remain in the insulation coating. Of course, the reaction does not necessarily proceed to this stage just after performing the coating (spraying) step. What the insulating coating of glass is actually formed is a curing (heating) process described later. In the following description, TEOS is used as the orthosilicate compound. Although the sprayed glass forming material does not necessarily cover the entire surface of the magnetic steel sheet immediately, it may still be possible. The glass forming material may be spread over the entire surface of the electromagnetic steel sheet by the start of the curing (heating) step described later.

  The lamination process of the above-mentioned "3." is a process of stacking a large number of electromagnetic steel sheets that have undergone the coating (spraying) process. When the glass forming material is supplied only to one side in the coating (spraying) step, the layers are laminated as follows in this step. That is, with respect to the front and back of each electromagnetic steel sheet to be laminated, the faces with the glass forming material are all directed to the same side. That is, the faces with the glass forming material do not face each other between the adjacent electromagnetic steel sheets. There is also no face-to-face relationship without glass formers. Therefore, in the stacked laminate, the electromagnetic steel sheet and the glass forming material are alternately positioned.

  The curing (heating) step of the above-mentioned "4." is a step of vitrifying the glass forming material sprayed in the coating (spraying) step to form a solid insulating film. In this step, the laminate obtained by the lamination step is heated to a temperature of 80 ° C. or more and 120 ° C. or less. This accelerates the aforementioned hydrolysis reaction and escapes the generated ethanol. The heating time is about 1 minute to 5 minutes.

  Thereby, as shown to sectional drawing of FIG. 3, the laminated iron core 3 of the structure which laminated | stacked the electromagnetic steel plate 1 and the glass layer 2 alternately is obtained. In the laminated core 3, the glass layer 2 serves as an insulating layer between the electromagnetic steel plates 1. The glass layer 2 also plays a role as an adhesive layer which joins the electromagnetic steel plates 1 to hold the entire laminated core 3 as one unit. The cross-sectional view of FIG. 3 is a cross-sectional view of a portion A in the laminated core 3 shown in FIG. 4 as a whole perspective view. In FIG. 4, the shape of the laminated core 3 is drawn in a considerably simplified manner, and in actuality, various shapes such as through holes and slots are formed.

  The method of manufacturing the laminated core 3 according to the above procedure has the following features. First, the manufacturing process is relatively simple. This is because the formation of the glass layer 2 and the joining of the electromagnetic steel plates 1 are simultaneously performed by the curing (heating) process of “4.”. For this reason, it is not necessary to go through the process of joining electromagnetic steel plate 1 comrades separately from the process of forming the glass layer 2. FIG. Second, a laminated core 3 in which the insulation between the magnetic steel sheets 1 is reliable can be obtained. According to this manufacturing method, no mechanical stress is applied to the laminated core 3 after the glass layer 2 is formed. Therefore, the glass layer 2 is not damaged and the insulation is reliable.

  Third, a laminated core 3 having a high ratio of the electromagnetic steel sheet 1 to the total volume is obtained. In other words, the glass layer 2 in the laminated core 3 is thin compared to the conventional one. This effect is obtained when the application of the glass forming material in the coating (spraying) step of “2.” is performed only on one side of the magnetic steel sheet 1. For this reason, as described above, in the state in which the magnetic steel sheets are stacked in the lamination process of "3.", the surfaces with the glass forming material in the magnetic steel sheets do not face each other. That is, the glass layer 2 in the laminated core 3 has a thickness of only one layer of the glass forming material.

  In the prior art (see FIG. 5), when insulating coatings are formed in advance on both sides of the electromagnetic steel sheet 1 and then lamination and bonding are performed, each insulating layer 4 has a thickness equivalent to two insulating coatings become. In comparison, the glass layer 2 of the laminated core 3 is thin. For this reason, the magnetic efficiency of the laminated core 3 obtained is high. 3 and 5 are not drawn to the same scale, the widths of the glass layer 2 and the insulating layer 4 on the figure should not be directly compared.

  The method of manufacturing the laminated core 3 according to the present embodiment can be continuously performed by an apparatus in which a punching press, a sprayer and a heating furnace are integrated. For that purpose, the apparatus 20 shown in FIG. 6 is used. The apparatus 20 includes a punching unit 30, a spraying unit 40, an accumulation unit 50, and a heating unit 60. The punching portion 30 is provided with a punch 31 and a die 32. As a result, it is possible to carry out a punching process in which the base plate 10 of the magnetic steel sheet is punched into the shape of a single plate of the laminated core 3.

  The spray unit 40 is provided with spray nozzles 41 and 42. The spray nozzle 41 is for TEOS spraying, and the spray nozzle 42 is for water spraying. As a result, it is possible to carry out a coating (spraying) step of spraying TEOS and water on the electromagnetic steel sheet 1 in the shape of the punched original plate. When the punched electromagnetic steel plate 1 is received by the spray unit 40, the spray nozzles 41 and 42 can be temporarily retracted.

  The accumulation unit 50 is a portion for accumulating the electromagnetic steel sheets 1 which have undergone the coating (spraying) process. The heating unit 60 is provided with a heater 61. In the heating unit 60, the laminated body of the electromagnetic steel plates 1 accumulated in the accumulation unit 50 is received and heated by the heater 61, thereby forming the glass layer 2 between the electromagnetic steel plates 1 and curing as a laminated core 3 ( Heating) can be carried out. Thereby, the manufacturing method of this form can be implemented by a series of processes.

  Hereinafter, variations in the manufacturing method of the present embodiment will be described. First, FIGS. 7 and 8 show variations regarding the spray amount in the coating (spray) process. What is shown in FIG. 7 is an example in the case where the spray amount of the glass forming material (a generic term of TEOS and water, the same applies hereinafter) 21 is relatively small. The amount of the glass forming material 21 in the example of FIG. 7 is that the glass forming material 21 spreads over the entire surface of the electromagnetic steel sheet 1 until the laminated body of the magnetic steel sheet 1 is subjected to the curing (heating) step, It is determined as an amount that does not exude to the end face. Thereby, as shown in FIG. 3, although it fills with the glass layer 2 without a clearance gap between the plate surfaces of the magnetic steel sheet 1, the laminated core 3 of the state which the end surface 11 exposes is obtained. In this example, the amount of glass forming material 21 used can be minimized.

  FIG. 8 shows an example in which the spray amount of the glass forming material 21 is larger than that in the case of FIG. The amount of the glass forming material 21 in the example of FIG. 8 is an amount such that the glass forming material 21 spreads over the entire surface of the electromagnetic steel sheet 1 and further covers the end face before being subjected to the curing (heating) step. It is defined as Thereby, as shown in FIG. 9, the lamination between the plate surfaces of the electromagnetic steel sheet 1 is not only filled with the glass layer 2, but the end face 11 of the electromagnetic steel sheet 1 is also covered with the glass layer 2. Iron core 5 is obtained. The laminated core 5 manufactured in this example is suitable for applications where reliable insulation between the end face 11 and the outside is also required.

  The example which made the spraying position of the glass formation material 21 two places in FIG. 10 is shown. The total amount of the glass forming material 21 in the example of FIG. 10 is an intermediate amount between the case of FIG. 7 and the case of FIG. Specifically, the glass forming material 21 spreads over the entire surface of the electromagnetic steel sheet 1 before being subjected to the curing (heating) step, and further covers the end face only at a position near the spray position. It is defined as Thereby, as shown in FIG. 11, the laminated iron core 6 in which the end face is partially covered with the glass layer 2 is obtained. In the laminated core 6 of FIG. 11, the area where the side surface is covered with the glass layer 2 has the same cross-sectional structure as FIG. 3 and the area where the side surface is not covered with the glass layer 2 (the range indicated by “Q” in FIG. ) Is the same cross-sectional structure as FIG. Such a laminated core 6 is suitable for applications where reliable insulation from the outside is required only at specific phase angle positions.

  In order to carry out the coating (spraying) step as shown in FIG. 10, it is conceivable to prepare two sets of the spray nozzles 41 and 42 as shown in FIG. However, the present invention is not limited to this, and it can be coped with by making one set of spray nozzles 41 and 42 movable. Further, the spray position on the plate surface of the magnetic steel sheet 1 is not limited to two, and may be three or more. On the contrary, it is also possible to set the position only at one place and off center. Therefore, as shown in FIG. 11, the number of the places where the side surface is covered with the glass layer 2 is arbitrary.

  Shown in FIG. 12 is a partial cross-sectional view of a laminated core 8 having an insulating layer structure in which granular glass 7 is blended in a glass layer 2. Particulate glass 7 was not produced by hydrolysis of TEOS, but was mixed as originally solid glass microspheres in the glass forming material (TEOS or water) supplied in the coating (spraying) step. It is a thing. That is, in the coating (spraying) step in this case, the particulate glass 7 is mixed in advance in at least one of TEOS and water to be sprayed. In this way, the thickness T of the glass layer 2 between the electromagnetic steel plates 1 can be controlled by the particle size of the granular glass 7. In particular, the thickness T of the glass layer 2 can be managed more appropriately by performing the curing (heating) step while pressing the laminate in the thickness direction (arrow F in FIG. 12).

  Thus, even when the particulate glass 7 is used in combination, as shown in FIG. 9, the end face 11 of the electromagnetic steel sheet 1 can also be a laminated core 9 having a structure covered with the glass layer 2 (see FIG. 13). Furthermore, it is also possible to use the laminated iron core shown in FIG. 11 in which the side surface is partially covered with the glass layer 2 while using the granular glass 7 in combination.

  The series of processes as described above can be performed continuously by the apparatus 29 shown in FIG. The apparatus 29 of FIG. 14 has an unwinding unit 22, a leveler 23, a conveying device 24, and a press 25. The unwinding portion 22 is a portion for feeding out the original plate of the magnetic steel sheet 1 from the coil 26. The leveler 23 has a plurality of rolls 27 and corrects the curl of the electrical steel sheet 1 unwound from the coil 26. The transport device 24 transports the magnetic steel sheet 1 from the leveler 23 to the press 25. A series of processes of the above "1." to "4." are performed by the press 25. That is, the press 20 incorporates the device 20 shown in FIG. Thereby, as shown in FIG. 15, the laminated core 3 (laminated iron cores 5, 6, 8, 9 may be used, the same applies hereinafter) is manufactured. The manufactured laminated core 3 is taken out of the discharge conveyor 28.

  Next, variations of the insulating coating in the laminated core 3 will be described. Although the glass layer 2 has been mentioned as an example of the insulating film in the above description, various other films can be used. For example, ceramics (including the glass described above), resins (including those of the type used as an adhesive), rubber (the same) may be mentioned. As ceramics, in addition to the above-mentioned glass derived from TEOS, enamel etc. are mentioned. As the resins, resins of a kind having some curability are preferable. Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, polyurethane resin, polyimide resin, alkyd resin, unsaturated polyester resin, epoxy resin and the like. As a photocurable resin, a bismethacrylate etc. are mentioned and the wavelength of the light irradiated for hardening, such as an ultraviolet-ray, visible light, and infrared rays, does not matter. In addition to this, it may be a pressure curable resin. The rubber may be anything as long as it is of the type synthesized by the polymerization method. Of course, also in these cases, as described in FIG. 12 and FIG. 13 described above, solid insulating particles may be mixed beforehand from the beginning.

  Then, the variation about the specific method of the coating process of said "2." is demonstrated. Although spraying was mentioned as a coating method in the above-mentioned example, various methods other than spraying can be used. For example, liquid jet (FIG. 16), under droplets (FIG. 17), die coat (FIG. 18), roll coat (FIG. 19), blade coat (FIG. 20), spin coat (FIG. 21), dipping (FIG. 22) It can be mentioned. In addition, in the case of dipping, it becomes double-sided coating.

  Next, variations of the curing process of “4.” will be described. What is shown in FIG. 23 is the curing process by the sol-gel method. In the sol-gel method, a sol-like substance which is a raw material of the insulating film is applied and gelled to form the insulating film. The method of producing glass by hydrolysis of the above-mentioned ortho silicate compound (TEOS etc.) is also included in the category of sol-gel method. Although FIG. 23 is drawn to heat the laminate following the above-mentioned example, the conditions for causing the gelation reaction depend on the type of the coating material. Therefore, depending on the type of coating material, heating is not always necessary.

  Shown in FIG. 24 is a curing process by pressure curing. When the coated coating material is a pressure-curable resin, the coating material is cured by applying pressure in the thickness direction as shown in FIG. What is shown in FIG. 25 is a curing process by a photo-curing method. When the coated coating material is a photocurable resin, the coating material is cured by light irradiation as shown in FIG. Depending on the type of coating material, electromagnetic waves such as microwaves may be emitted.

  FIG. 26 shows a curing process by heating. When the coated coating material is a thermosetting resin, as shown in FIG. 26, the coating material is cured by heating. The curing step of FIG. 26 is the same as that of FIG. 23 in that the laminate is heated, but whether the curing reaction of the coating material is a sol-gel reaction or a thermosetting reaction of a thermosetting resin Is different. Although the laminated body is heated by the heating furnace in FIG. 26, it may be blown by hot air as shown in FIG. Alternatively, as shown in FIG. 28, Joule heat of energization to the magnetic steel sheet 1 may be used. Instead of bringing the electrodes into contact with the magnetic steel sheet 1, a noncontact induction heating method may be used. Further, as shown in FIG. 29, high frequency heating using microwaves may be used. However, the coating material in that case needs to contain a molecular structure that absorbs heat and generates heat like OH group. It is acceptable if the thermosetting resin itself contains such a molecular structure, and a substance containing such a molecular structure may be blended as a heat generating agent separately from the thermosetting resin.

  As described above in detail, according to the present embodiment, for example, the coating of the coating material by the spray of the glass forming material is applied to the electromagnetic steel sheet 1 which has the shape of a single plate through the punching process of "1." It is decided to carry out each process of lamination and curing (heating) after the work. For this reason, after the insulating layer (glass layer 2) between the electromagnetic steel sheets 1 is formed, no mechanical stress is applied to the electromagnetic steel sheets 1 or the laminate thereof. Therefore, a manufacturing method capable of manufacturing laminated iron cores 3, 5, 6, 8, 9 with reliable insulation between the magnetic steel sheets 1 is realized. Further, in the curing (heating step), the formation of the glass layer 2 (insulation layer) based on the glass forming material (coating material) is performed, whereby the bonding between the electromagnetic steel sheets 1 is simultaneously made. Therefore, since a separate bonding process is not required, the number of processes is relatively small, and the manufacturing method is a simple process.

  In addition, by coating the coating material in the coating step only on one side of the electromagnetic steel sheet 1, it is possible to manufacture a laminated core without thickening the insulating layer to be formed more than necessary. That is, a laminated core having high magnetic efficiency can be obtained. Also, by adjusting the amount of coating material applied in the coating process, an insulating layer may be present only between the plate surfaces of the electromagnetic steel sheet 1, or the end face may be covered with an insulating layer, etc. It can be divided. In addition, by mixing granular insulating material in the coating material, the thickness of the formed insulating layer can be more appropriately managed.

  The present embodiment is merely an example and does not limit the present invention. Therefore, the present invention is naturally capable of various improvements and modifications without departing from the scope of the invention. For example, when a glass forming material is used as the coating material, the silicon-containing compound supplied as the glass forming material is not limited to TEOS, but may be another orthosilicate compound (for example, tetramethyl orthosilicate etc.). Even silicon-containing compounds other than orthosilicate compounds may be used as long as they form glass by any chemical reaction. Therefore, it is not necessarily limited to what is supplied with water. It may form a glass by reaction with any compound other than water, or may form a glass alone.

DESCRIPTION OF SYMBOLS 1 Magnetic steel plate 2 Glass layer 3, 5, 6, 8, 9 Laminated iron core 4 Insulating layer 7 Particulate glass 21 Glass forming material 30 Punching part 31 Punch 32 Die 40 Spraying part 41, 42 Spraying nozzle 50 Accumulation part 60 Heating part 61 Heater

Claims (5)

Punching process of electromagnetic steel sheet into single sheet of laminated core,
A step of applying an uncured insulating material to form an insulating layer by curing the electromagnetic steel sheet in the shape of a single plate punched out in the punching step;
Laminating a magnetic steel sheet having an insulating material coated on the surface in the coating step;
Curing the insulating material in the laminate of the magnetic steel sheets laminated in the laminating step to form an insulating layer;
In the coating process,
As the insulating material, Rutotomoni using glass forming materials to form a glass,
The amount of the glass forming material is an amount which spreads over the entire surface of the magnetic steel sheet but is not exuded to the end surface until it is subjected to the curing step,
In the curing step, the laminated body of the magnetic steel sheets laminated in the laminating step is heated to vitrify the glass forming material coated in the coating step by heat. . Punching process of electromagnetic steel sheet into single sheet of laminated core,
A step of applying an uncured insulating material to form an insulating layer by curing the electromagnetic steel sheet in the shape of a single plate punched out in the punching step;
Laminating a magnetic steel sheet having an insulating material coated on the surface in the coating step;
Curing the insulating material in the laminate of the magnetic steel sheets laminated in the laminating step to form an insulating layer;
In the coating process,
As the insulating material, Rutotomoni using glass forming materials to form a glass,
The amount of the glass forming material is an amount which spreads over the entire surface of the magnetic steel sheet and is also covering the end face before being subjected to the curing step,
In the curing step, the laminated body of the magnetic steel sheets laminated in the laminating step is heated to vitrify the glass forming material coated in the coating step by heat. . A method of manufacturing a laminated core according to claim 1 or 2 ,
In the coating step, coating is performed by spraying, and a method of manufacturing a laminated core. The method for producing a laminated core according to any one of claims 1 to 3 , wherein the coating step
A method of manufacturing a laminated core, comprising applying an insulating material mixed with particles of a solid insulating material to a magnetic steel sheet. The method for producing a laminated core according to claim 4 , wherein the curing step
A method of manufacturing a laminated core, wherein the insulating material is cured while pressing the laminated body of the magnetic steel sheets laminated in the laminating step in the thickness direction.

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