알루미늄의 온간액압성형공정설계를 위한 공정변수 연구

다국어 초록 (Multilingual Abstract)

In this study, hydroformability and mechanical properties of Aluminum 6061 tube at different extrusion type and heat treatment conditions were investigated. For the investigation, as-extruded, full annealed and T6-treated Al 6061 tubes at different extrusion type were prepared. To evaluate the hydroformability, uni-axial tensile test and free bulge test were performed at room temperature and 250℃. Also mechanical properties of hydroformed part at various pre- and post-heat treatments were estimated by tensile test. And the tensile test specimens were obtAlned from hexagonal prototype hydroformed tube at 250℃. As for the heat treatment, hydro formability of full annealed tube is 25% higher than that of extruded tube. The tensile strength and elongation were more than 330㎫ and 12%, respectively, when hydroformed part was post-T6 treated after hydroforming of pre- full annealed tube. However, hydroformed part using T6 pre treated tube represents high strength and low elongation, 8%. Therefore, the T6 treatment after hydroforming for as-extruded tube is cost-effective. Hydroformability of Al6061 tube showed similar value for both extrusion types. But flow stress of seam tube showed 20-50㎫ lower value than seamless tube.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험방법
• 3. 실험결과 및 고찰
• 4. 결론
• 참고문헌