| $360^{circ}$ Cold Bending of Ti-6Al-4V Large-Diameter Seamless Tube |
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| 대 직경 이음매 없는 Ti-6Al-4V 튜브의 $360^{circ}$ 냉간 굽힘 |
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허선무, 박종승 |
1국방과학연구소 기술연구본부 5부
2국방과학연구소 제3체계개발본부 |
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| Abstract |
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$360^{circ}$ bending of Ti-6Al-4V large-diameter seamless tube(62.37 mm $OD { imes} 4.40mm$ wall thickness) has been achieved at room temperature without heating. The bending process comprised two steps : the first step is $360^{circ}$ bending by an uniquely designed rotary bender allowing spring back, which is subsequently eliminated by the second or finishing step which comprised repeated bending processes by powered three roll bender, In odor to prevent collapse of tube during bending, Cerro $Tru^{TM}$(Trade name of a non-ferrous low melting point alloy)has been employed as a filler metal. The resultant ovality(out of roundness) obtained was 1.28%, as compared with 6~8% without applying Cerro $Tru^{TM}$. |
| Key Words:
Cold Bending, Seamless Tube, Rotary Bender, Spring Back, Powered Three Roll Bender, Cerro $Tru^{TM}$, Ovality |
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