| 摘要 |
PROBLEM TO BE SOLVED: To enhance and stabilize bonding strength and magnetic performance by hot pressing an electromagnetic steel plate laminated together with a film- like adhesive. SOLUTION: When an electromagnetic steel plate 12 carried while being applied with a film-like adhesive 16 is fed to a first press, a shaft hole 22 and four grooves 23 are punched out along with a small hole 12a for positioning and then the steel plate 12 is fed sequentially to a second press 24. Subsequently, the profile of a core 51 is punched out by means of the punch 27 in an upper die 25 and the die 41 in a lower die 39 and a specified number of the steel plates are laminated sequentially on a receiving base 43. Thereafter, a planar magnet 52 is inserted into the core 51 by means of second upper and lower dies 39 and the entire core 51 is set in a state being pressed with an appropriate pressure against the receiving base 43. When the core 51 is heated from the inside and outside, the film-like adhesive 16 is plastisized and flows in from the inner circumference of the groove 23 to fill the gap to the magnet 52 thoroughly before being hardened trough chemical reaction. According to the method, a sufficient bonding strength is attained while enhancing and stabilizing the magnetic performance.
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