Manufacturing method of laminated iron core

Abstract

The purpose of this invention is to provide a method for manufacturing a laminated iron core that can be manufactured regardless of the type of insulating film and possesses excellent adhesion strength and heat resistance. This invention relates to a method for manufacturing a laminated iron core formed by bonding an electromagnet with an insulating film, comprising a surface modification step: before applying an adhesive to the surface of the electromagnet with the insulating film, a surface modification treatment is applied to the surface of the electromagnet with the insulating film for at least 4 seconds to form a surface-modified surface. The time from the completion of the surface modification treatment to the application of the adhesive on the surface of the electromagnet with the insulating film is preferably set to within 60 seconds. In the surface modification step, the surface modification treatment is preferably plasma treatment and / or ultraviolet treatment.