Deformation behavior of A6063 tube with initial thickness deviation in free hydraulic bulging
(1.陕西省西安市西安交通大学机械工程学院
2.广西壮族自治区桂林市桂林电子科技大学机电工程学院
3.School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
4.School of Mechatronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China)
2.广西壮族自治区桂林市桂林电子科技大学机电工程学院
3.School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
4.School of Mechatronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China)
Abstract: Experiment on seamless tubes of aluminum alloy A6063 with initial thickness deviation of 0–20% was conducted through a free hydraulic bulging with tube ends free. The influence of initial thickness deviation on the cross-section profile, thickness distribution, maximum internal pressure and maximum radial expansion was investigated. FEM simulation was also performed in order to examine and help explaining the experimental results. The results indicate that the internal pressure and maximum internal pressure appear to be little influenced by the initial thickness deviation, and that the cross-section profile of the bulged tube changes diversely and can not be a perfect circle. The results also suggest that the increase in initial thickness deviation may lead to a remarkable decrease in maximum radial expansion, and a rapid increase in thickness deviation and the center eccentricity of the inner and outer profiles.
Key words: tube; A6063; aluminum alloy; free hydraulic bulging; thickness deviation; FEM simulation