The Thinning Phenomena of the Wall Thickness during $360^{\circ}$ Cold Bending of Ti-6Al-4V Large-Diameter Seamless Tube

대 직경 이음매 없는 Ti-6Al-4V 합금 튜브의 $360^{\circ}$ 냉간 굽힘 시 벽두께 감소현상

The wall thickness of the Ti-6Al-4V Large-Diameter Seamless Tube, which is supposed to be a very important parameter in a system design, was measured during $360^{\circ}$ cold bending processes. The factors or processes affecting the wall thickness include 1) primary bending, 2)secondary or finishing step of the $360^{\circ}$ bending, 3)cleaning processes in CERO TRUTM(CT)process. But thinning effects of the wall thickness during the cleaning processes are negligible compared to those during the formers. The variations in the percentages of the change in wall thickness were found to be from -14% to +16%.