高精度な極細線のための冷間伸線加工のFEM解析

（ミクロからの変形挙動の理解）

抄録

Currently, there is an increasing demand for high precision extra fine wires. In order to manufacture ultrafine wires with high accuracy, it is necessary to clarify the processing behavior inside the wire. Therefore, the purpose of this study is to investigate the change of the mechanical state inside the wire that has been drawn multiple times. However, since it is difficult to observe the wiredrawing process experimentally, the state inside the wire is observed by finite element (FE) analysis. We create two models each of which is a continuous four-passes wiredrawing unit, and in the simulation we transpose the end state of the first model into the beginning state of the second model, which means we conduct a continuous eight-times wiredrawing calculation. From the analyzed results, it is found that the mechanical state inside the wire changes greatly as the number of working passes increases. The plastic strain inside the wire increases as the wiredrawing process continues, and its values differ between the outer (peripheral) and the central portions of the wire. The stress inside the wire increased as wiredrawing continues. However, for the larger area reduction, the stress does not increase so much.