加工コイル設計のための電磁かしめシミュレーションの開発

Abstract

Electromagnetic crimping is a crimping method for applying uniform crimping force to metal parts in a shorter forming time than conventional press crimping. It is difficult to measure and determine the crimping force acting on metal parts because the crimping force affected by the magnetic field and Lorentz force induced by current in a forming coil is invisible. Additionally, current is affected by the circuit characteristics of an electromagnetic forming instrument and the shape of a forming coil. Hence, it is difficult to design a forming coil. In this study, simulation procedures were developed for designing a forming coil. First, the circuit characteristics of an electromagnetic forming instrument were identified to predict current in a forming coil accurately. Second, electromagnetic crimping was simulated by the coupled analysis of a circuit simulation to consider the effects of circuit characteristics and the finite element method to consider shape of a forming coil. Finally, a forming coil for electromagnetic crimping was designed by using the developed simulation procedures. Required current in the designed coil was determined. The shape of the crimped workpiece in the simulation was similar to an experimentally crimped sample. These results indicate that the developed simulation procedures are useful for designing the shape of a forming coil.