FE approach and experiments for an axisymmetric micro-yoke part forming using grain element and grain boundary element

Until present, an axisymmetric yoke part of electro-magnetic micro-speaker/receiver had manufactured by machining through the material’s removal. However, this machining process have some problems such as long production time, high precision of tool and costs. In this study, a program based on finite element method developed to establish milli-structure forming technology for micro-yoke component, one of the key parts in the multi-functioned micro-speaker/receiver. This developed program is applied for the milli-part forming in order to replace the machining process of micro-yoke. A new numerical approach is proposed to simulate intergranular milli-structure in forming the miniature yoke, in which grain elements and grain boundary elements are introduced. The results of the finite element analysis for micro-yoke part are confirmed by a series of experiments.