チタン合金の局部加熱インクリメンタル
フォーミングの適用検討

— チタン合金のインクリメンタルフォーミング法の開発　第2報 —

抄録

A forming experiment on a titanium alloy sheet of Ti-6Al-4V was carried out to study the features of incremental forming using a bar tool and high-frequency induction coil set beneath a blank sheet. A sheet heated by the induction coil was formed such that it had less than half the thickness of the original blank under certain conditions. The formed article was straightened by creep forming under argon gas pressure in a hot die. Finally, effective forming conditions were analyzed, and the forming of an article was completed successfully resulting in good quality. It was found that the combination of incremental forming and creep forming is comparable to superplastic forming (SPF) in formability and quality, and that this working process has advantages in low-temperature working condition and non-strict facility requirement, by comparison with SPF. It is expected that the process will become more widely used in the forming of titanium alloy sheets as a new working method in small production industries.