عنوان مقاله [English]
Explosive forming is an alternative forming approach among metalworking processes, such as hydroforming, which can be applied in bulge forming to manufacture metal bulge tubes. Bulge forming is a manufacturing process that is important and desirable as a technology that can be used to make seamless, lightweight and near-net-shaped industrial components. Due to its capability of creating complex shapes in a single step, the process is being applied in the automotive and aerospace industries, where the demand for increased structural strength and decreased vehicle weight makes it a very attractive manufacturing method. The bulging process is an expansion of a part of a tube, in the radial direction, by mechanical or hydraulic means. The main benefit of bulging is to accommodate the movement of pipes, due to thermal and mechanical changes in the system.In this research work, the finite element simulation of the bulge forming process was carried out to demonstrate the design, analysis and manufacturing of a bulge tube by an underwater explosive forming process. In addition, the effects of process parameters on the quality of the product were studied. Then, the type of explosive material was selected and the quantity of material required for explosive forming was calculated using energy and Douglas methods. To make the workpart by physical explosive forming, a die-setup and a process were designed.Then, for modeling the explosive forming process, AUTO-CAD and HYPER-MESH were utilized. Simulation and analysis of the explosive process was undertaken using finite element software called LS-DYNA. Finally, the verification of numerical results was performed using energy and Douglas methods.