This work deals with the efficiency of energy transfer in impact forming machines due to the interaction of the process with machine structure as represented by a two degree-of-freedom (dof) system. The forming process is simulated by a rectangular force pulse as a function of time [1]. The effects of various parameters of the structure and also of the pulse on the energy transfer have been explored. It is found that the shock absorbers, commonly used for isolating the vibrations originating from such machines, restrict the attainment of 100 percent forming efficiency. Also, there exists a pulse-insensitive zone in the efficiency variation in which efficiency is independent of the forming operation and that the design of the machine should aim to achieve it.

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