電磁力による金属円板の高速成形に関する研究 : 第1報,渦巻形へん平コイルにより発生する電磁力の測定

概要

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In designing effective electromagnetic forming systems, more knowledge on the mutual induction between forming coils and workpieces and on resulting magnetic force are required. Coupling coefficient k_c between a spiral flat work coil of 15 turns and different specimens of circular plates in an electromagnetic forming machine is evaluated based on the measurement of effective coil inductance. k_c at different circuit frequencies is obtained and shown as a function of the ratio of the thickness of the specimen to the skin depth, h_0/δ_s. If h_0/δ_s is greater than 0.5, k_c is about 0.92. Impulses of an electromagnetic force defined by the time integral of the force are measured by accelerating specimens. The impulse depends on the conductivity and the thickness of the specimen. The surface density of a specimen also plays a significant role when kinematic energy gained by the specimen is concerned. It is shown that a frequency range to maximize the impulse at constant initial energy stored in a capacitor bank exists between h_0/δ_s=0.3〜0.8.
一般社団法人日本機械学会の論文
1987-09-25