Fuchs卵形断面を有する線材の1パス伸線による成形

―異形引抜きのためのパススケジュール設計―

抄録

To design a drawing schedule for a wire with Fuchs' ovate section from a round wire, the effects of the cross-sectional shape and the reduction in cross-sectional area on underfilling have been investigated by experiments and numerical analyses. It has been found that under conditions where the axis ratio (major axis length/minor axis length) is less than 1.3, underfilling is suppressed when the area reduction is greater than 30 %. It has been confirmed that the lateral spread by drawing is very small, about 1 to 3 %, and not sensitive to the area reduction. Furthermore, the center position of the wire before drawing is distant from the center of gravity of Fuchs' ovate section when the area reduction is small, and the axis ratio is large. It has been determined that the center of gravity of the die hole almost matches that under conditions where underfilling is suppressed when the area reduction is large. The minimum initial wire diameter before drawing to suppress underfilling has been revealed.