433 引抜きによる精密異形棒線の製造(OS 材料の超精密加工・マイクロ加工)

抄録

Round-to-hexagonal and round-to-octagon drawing of the S45C steel (JIS) and the copper wire has been investigated. Long-shaped products are characterized by a high surface quality as well as by a high dimensional accuracy. Many concepts, including the slab method, that are used in round bar drawing cannot be applied to the drawing of shaped wire. Round-to-shaped wire drawing has been_simulated by a 3D-FEM. In this study, authors drew the shaped wire from round wire by changing the die half-angle and one-pass reduction and examined the drawing stress, dimensional accuracy (diameter, magnitude of corner R) and residual stress. The results reveal that the optimal die half-angle for shaped wire drawing is slightly greater (α=10〜13° ) than that for round wire drawing and that the one-pass reduction is about 30% .