SWOSC-Vのばね加工により生成される集合組織

抄録

The texture of springs is related to fatigue, creep, and especially strength. We investigated the microstructure in order to clarify the changes of the texture during the manufacturing process of the springs, and to contribute to further strengthening of springs. In this study, we simulate the texture produced by drawing and coiling wires in the spring manufacturing according to the predictive theory of crystal rotation based on Katoh's theory, which is based on the theory of Taylor et al. Also, we observed the crystal structure of the drawn and oil-tempered wires by electron backscattering diffraction (EBSD), and it was observed that the axial direction of crystal orientation rotates toward <110>. This result follows the predicted ones. Next, in order to predict the crystal direction rotated by coiling, we used finite element analysis (FEM) to identify the plastic strain generated during the coiling process, and input them to that theory for crystal rotation. The results show that the axial crystallographic orientation <110> relaxes on the outside of the wire cross section and also, while on the inside, the orientation accumulated around the crystallographic orientation <110> on the inside during the coiling process.