MANUFACTURE OF LAMINATED IRON CORE
Document Type and Number:
Japanese Patent JP3216729
PURPOSE: To provide the manufacture of a laminated iron core which is low in manufacturing cost and in which a rotor piece is formed by the use of an inside diameter area where the rotor storing hole of a stator piece is formed.
CONSTITUTION: In a first process, the rotor piece is formed by punching in a prescribed outer circumferential shape from the inside diameter area in the stator piece 100; in a second process, the stator piece is pressurized in the thickness direction and an inner circumferential part 100i is pushed out in the inner radial direction; and in a third process, the inner circumferential edge part of the stator piece is formed by punching in the prescribed shape over the entire circumference in order to form the rotor storing hole 101. Also, in the first process, the rotor piece punched out of the stator piece is pressurized in the thickness direction; the outer circumferential edge part is pushed out in the outer radial direction; and then the outer circumferential edge part is formed by punching in the prescribed shape over the entire circumference.
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