چكيده به لاتين
Abstract:
Metal bellows are important parts in flexible and shock absorber structures. They are used in various industries such as car manufacturing, aerospace due to their special properties in absorbing mechanical vibrations and also expansion and shrinkage. In general, production methods of metal bellows are welding, machining and forming. Their traditional methods need dies and tools which leads to high cost of dies and machinery. Recently, dieless forming processes have been introduced to reduce the high cost of dies and tools. In this work, local heating and axial compression techniques are innovative ideas which have been taken into consideration for bellows manufacturing. A parametric study of the process have been performed by experiments and also numerical simulations. Results show that suitable convolution shape can be achieved by controlling process parameters like applied displacement and device current. By using this method, part energy absorption has been increased by 108 % in relation to initial tube. In contrast to traditional forming processes, crown thickness has been increased by 30 % that leads to higher strength. This method can be introduced as a suitable alternative process for high cost induction local heating.
Keywords: Metal Bellows, Shell forming, Local Heating, Electric Arc, Finite Element Method, Dieless Forming
