Laminated core and method for manufacturing laminated core

Abstract

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.

Dependencies are inferred from the claim text.