Abstract
Floating-Expanding-Plug-Bending of pipe is characterized by expanding and shifting of floating plug, both of which are helpfully functioning to the bending, reducing working force and realizing severe bending with high-precision cross section profile. By using this method, a circular pipe is deformed to triangle section with triangle-shape plug In order to obtain the basic characteristics of bending to polygonal section pipe, geometric shapes of triangle plug which produce triangle section were investigated. In the experiments, it was realized that the plug should not have sharp edge and circular aspect to form triangle bent pipes. Both bending and expanding completed at the same time on the bending method. In this research, deformation behavior of metal materials in Floating-Expanding-Plug Bending was also analyzed with FEM analysis and experiment.
