The present invention consists of a method and apparatus for the application of particle size-controlled liquid coatings on sheets of varying geometries, which are stacked and compacted. Such coatings can be adhesives, accelerators, insulators or thermal barriers. The method and apparatus allows the size of the particles in suspension of the coating to be measured for each application, in order to control the quantity used.

The present invention consists of a method and apparatus for the application of particle size-controlled liquid coatings on sheets of varying geometries, which are stacked and compacted. Such coatings can be adhesives, accelerators, insulators or thermal barriers. The method and apparatus allows the size of the particles in suspension of the coating to be measured for each application, in order to control the quantity used.

A laminated core 10 includes electrical steel sheets 1 and adhesive insulating coatings 2 alternately stacked and has a lamination direction D tensile strength of adhesive bond of 20 MPa or more measured under a 25 C. condition after a complete reaction of each adhesive insulating coating 2. A method for manufacturing a laminated core 10 includes a punching step of punching an electrical steel sheet coated with an adhesive insulating coating 2 to form an electrical steel sheet 1, an accommodating step of stacking and accommodating electrical steel sheets 1 in a die after the punching step, a low-pressure bonding step of heating the electrical steel sheets 1 in the die at a surface temperature of 60 C. or more and 200 C. or less and bonding the adjacent electrical steel sheets 1 by pressurization at 3.0 MPa or less to form a laminated core 10, and a take-out step of taking out the laminated core 10 from the die after the low-pressure bonding step.

A laminated core 10 includes electrical steel sheets 1 and adhesive insulating coatings 2 alternately stacked and has a lamination direction D tensile strength of adhesive bond of 20 MPa or more measured under a 25 C. condition after a complete reaction of each adhesive insulating coating 2. A method for manufacturing a laminated core 10 includes a punching step of punching an electrical steel sheet coated with an adhesive insulating coating 2 to form an electrical steel sheet 1, an accommodating step of stacking and accommodating electrical steel sheets 1 in a die after the punching step, a low-pressure bonding step of heating the electrical steel sheets 1 in the die at a surface temperature of 60 C. or more and 200 C. or less and bonding the adjacent electrical steel sheets 1 by pressurization at 3.0 MPa or less to form a laminated core 10, and a take-out step of taking out the laminated core 10 from the die after the low-pressure bonding step.

A method for producing at least one liquid channel in a laminated core and a laminated core having this liquid channel are disclosed. In order to produce a media-tight liquid channel, it is proposed for a collar to be produced on each of at least two openings in that these collars are formed into the piece of sheet metal or sheet metal strip and/or sheet metal part, or at least two openings each having a collar are produced in the piece of sheet metal or sheet metal strip in that these collars are formed into the piece of sheet metal or sheet metal strip, wherein these collars are embodied in such a way that they engage in one another over the length of the liquid channel when sheet metal parts having these collars are stacked on top of one another.

A method for producing at least one liquid channel in a laminated core and a laminated core having this liquid channel are disclosed. In order to produce a media-tight liquid channel, it is proposed for a collar to be produced on each of at least two openings in that these collars are formed into the piece of sheet metal or sheet metal strip and/or sheet metal part, or at least two openings each having a collar are produced in the piece of sheet metal or sheet metal strip in that these collars are formed into the piece of sheet metal or sheet metal strip, wherein these collars are embodied in such a way that they engage in one another over the length of the liquid channel when sheet metal parts having these collars are stacked on top of one another.

Heating parts (212a to 212l, 222a to 222l) are brought into contact with planned heating regions (11a to 11l) of outermost electrical steel sheets (10a, 10b) of an electrical steel sheet group (100), to simultaneously pressurize and heat the planned heating regions (11a to 11l).

Heating parts (212a to 212l, 222a to 222l) are brought into contact with planned heating regions (11a to 11l) of outermost electrical steel sheets (10a, 10b) of an electrical steel sheet group (100), to simultaneously pressurize and heat the planned heating regions (11a to 11l).

The invention relates to an elementary lamination (10) in the form of a hollow disc, characterized in that the outside edge comprises a peripheral portion of said elementary lamination which has at least one structured section having a periodic structure (21) comprising a succession of periodicity elements, said periodic structure (21) being configured for aligning said elementary lamination in a helicoidal lamination stack (30), the peripheral portion further comprising at least one non-structured section (22), an orientation slot (23) being formed in the at least one non-structured section (22), said orientation slot being asymmetrical and/or closer to a periodic structure (21) on a first side of said non-structured section (22) than to the periodic structure (21) on a second side opposite from the first side of said non-structured section (22).

The invention relates to an elementary lamination (10) in the form of a hollow disc, characterized in that the outside edge comprises a peripheral portion of said elementary lamination which has at least one structured section having a periodic structure (21) comprising a succession of periodicity elements, said periodic structure (21) being configured for aligning said elementary lamination in a helicoidal lamination stack (30), the peripheral portion further comprising at least one non-structured section (22), an orientation slot (23) being formed in the at least one non-structured section (22), said orientation slot being asymmetrical and/or closer to a periodic structure (21) on a first side of said non-structured section (22) than to the periodic structure (21) on a second side opposite from the first side of said non-structured section (22).