Method And Device For Manufacturing Wound Iron Core

Abstract: In this method for manufacturing a wound iron core, at least one bent part (5) in any of at least one laminated steel plate (1) is formed by having one side (1b) of the steel plate (1) be placed on a die (30) and restrained thereon, and having a punch (40) be pressed on a portion (1a) to be bent on the other, free-end side of the steel plate (1), the punch (40) being pressed in the thickness (T) direction of the steel plate (1). The outer surfaces of the die and the punch each have an arc part (30a, 40a) having a prescribed curvature. The relationships in the following expressions (1) to (5) are satisfied, where T is the thickness of the steel plate (1), ? (°) is the bending angle of the bent part (5), Rd is the curvature radius of the die arc part (30a), and Rp is the curvature radius of the punch arc part (40a). Expression (1): 0.02=T/(2Rd+T)=0.15 Expression (2): 0.5=Rd=3.0 Expression (3): 0.15=T=0.30 Expression (4): 2.5=Rp/Rd=10 Expression (5): 10°=?=90°

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