RU-2861620-C2 - ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING BONDED AND STACKED CORES

Abstract

FIELD: metallurgy. SUBSTANCE: invention relates to an electrical steel sheet used as a material for manufacturing bonded and stacked cores, in particular stators for a rotating electrical machine. Electrical steel sheet comprises a base metal, the chemical composition of which contains, in addition to iron and impurities, 2.5-3.9 mas.% Si, 0.001-3.0 mas.% Al and 0.05-5.0 mas.% Mn. On one surface or both surfaces of the base metal of the sheet, an insulating coating is formed containing a curing accelerator containing an active component accelerating anaerobic curing. Said active component is selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium and combinations thereof. EFFECT: high bonding strength of sheets and increased productivity in manufacturing bonded and stacked cores. 5 cl, 8 dwg, 2 tbl

Inventors

• TAKEDA KAZUTOSHI
• TAKATANI Shinsuke
• HIRAYAMA RYU
• FUKUCHI MINAKO
• IWASE YOSHIAKI
• NIWA MAKOTO
• HIRAKAWA MAKOTO

Dates

Publication Date

20260506

Application Date

20220413

Priority Date

20210414

Claims (17)

1. 1. A sheet of electrical steel containing:
2. a base metal whose chemical composition contains, in addition to iron and impurities, 2.5-3.9 wt.% Si, 0.001-3.0 wt.% Al and 0.05-5.0 wt.% Mn, while
3. on one or both surfaces thereof an insulating coating is formed containing a curing accelerator, wherein the curing accelerator contains an active component that accelerates anaerobic curing, selected from titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, vanadium, molybdenum, ruthenium and combinations thereof.
4. 2. A method for producing a bonded and stacked core for producing a bonded and stacked core by performing press processing on a strip steel sheet with press processing oil applied to one surface or both surfaces thereof, applying an adhesive to one surface of the strip steel sheet to obtain a plurality of steel sheet components, and stacking and binding the steel sheet components, wherein:
5. The electrical steel sheet according to paragraph 1 is used as a strip steel sheet.
6. 3. A method for manufacturing a bound and packaged core according to paragraph 2, in which:
7. the steel sheet components include a first steel sheet component and a second steel sheet component, and
8. the method includes:
9. a first step in which a first steel sheet component is prepared, including an insulating coating on the first surface;
10. a second step in which a second steel sheet component is prepared, including an insulating coating, a pressing oil applied to the insulating coating, and an adhesive applied to the pressing oil on a second surface; and
11. a third step in which the first steel sheet component and the second steel sheet component are applied and bonded so that the first surface and the second surface face each other.
12. 4. A method for manufacturing a bound and packaged core according to paragraph 2, in which:
13. the steel sheet components include a third steel sheet component and a fourth steel sheet component, and the method includes:
14. the fourth step, in which the third steel sheet component is prepared, including the insulation coating and the pressing oil applied to the insulation coating on the third surface;
15. a fifth step in which a fourth steel sheet component is prepared, including an insulating coating, a pressing oil applied to the insulating coating, and an adhesive applied to the pressing oil on the fourth surface; and
16. the sixth step, in which the third steel sheet component and the fourth steel sheet component are applied and bonded so that the third surface and the fourth surface face each other.
17. 5. A method for manufacturing a bonded and packaged core according to any one of paragraphs 2-4, wherein the bonded and packaged core is a stator for a rotating electric machine.

Description

Field of technology to which the invention relates [0001] The present invention relates to electrical steel sheet and to a method for producing bundled and packaged cores. This application claims priority from Japanese Patent Application No. 2021-068106, filed April 14, 2021, the contents of which are incorporated herein by reference. Description of the prior art [0002] For example, a rotating electric machine used as an electric motor includes a stacked core. This stacked core is manufactured by repeatedly punching a strip steel sheet into a predetermined shape while intermittently feeding the strip steel sheet and stacking a plurality of the resulting steel sheet components. The steel sheet components are attached to each other by welding, binding, bending, etc., and among these, the method of fastening by binding attracts attention from the viewpoint of effectively suppressing core loss of the stacked core. [0003] For example, the following Patent Document 1 discloses a method for producing a stacked body of metal sheets by sequentially performing a plurality of pressing treatments on a wrap material with a pressing oil applied to one surface or both surfaces thereof, applying an adhesive to one surface of the wrap material, then performing perforation of an outer mold to obtain a metal sheet, and stacking and bonding a predetermined number of metal sheets, wherein a curing accelerator is added to the pressing oil. It is described that, according to this method for producing a packaged body from metal sheets, a curing accelerator is added to the pressing oil, and due to this, the bonding between the metal sheets is quickly and tightly performed without removing the pressing oil, it is possible to simplify the manufacturing stage, miniaturize the matrix in a forward-feeding matrix device, etc., and an increase in product quality and productivity is achieved, miniaturization of manufacturing equipment, etc. [0004] Furthermore, the following Patent Document 2 discloses a punching and stacking pressing method for punching a steel sheet component having a predetermined shape from an intermittently fed strip steel sheet and stacking the steel sheet component, wherein the punching and stacking pressing method includes: a first application step for applying one of an adhesive and a curing accelerator for accelerating the curing of the adhesive onto a lower surface of the strip steel sheet at an input side of a press processing position in which the steel sheet component is punched from the strip steel sheet; and a second application step for applying another adhesive and a curing accelerator onto an upper surface of the strip steel sheet at the press processing position. It is described that, according to this pressing method by perforating and laying, the curing time of the adhesive can be significantly shortened by performing the first application step and the second application step, and the productivity of the core produced by laying a plurality of steel sheet components can be improved. List of cited documents Patent documents [0005] Patent Document 1 Japanese Patent 4648765 Patent Document 2 Japanese Patent 6164029 The essence of the invention Problems solved by the invention [0006] According to the method for producing a stacked body from metal sheets of Patent Document 1, bonding between metal sheets can be quickly achieved by using a curing accelerator. Since the curing accelerator is applied in a diluted state by adding press processing oil, it is necessary to increase the curing accelerator content by a large amount when a higher curing acceleration effect is required. However, in this case, since the ratio of press processing oil is reduced at this time, a problem arises in which the workability of perforation during perforation of the metal sheet may be affected. Furthermore, the pressing method using perforation and placement in Patent Document 2 described above can significantly reduce adhesive curing time. However, the effect of pressing oil, which is essential for perforation, on the curing accelerator is also not studied here. [0007] As described above, in order to further improve the performance of the bonded and stacked core, the lubricating function of the press processing oil during steel sheet punching and the curing acceleration function of the adhesive by using a curing accelerator during steel sheet bonding should be demonstrated at a higher level. However, in the conventional method for producing the bonded and stacked core, since this is difficult, it may be difficult to achieve both high bonding strength and high performance. [0008] The present invention has been made in view of the above circumstances, and the object of the present invention is to provide an electrical steel sheet and a method for producing bonded and packaged cores that can achieve higher productivity while ensuring sufficient bonding strength in the production of the bonded and packaged core. Solution to the probl