Flexible punching method using an elastic tool instead of a metal punch

An experimental approach has been conducted to ascertain the effectiveness of a flexible punching method using a urethane elastomer for a relatively thin metal sheet. In this punching process, an elastic tool that consists of a urethane sheet and a metal die is used for punching instead of a conventional metal punch and die. By applying the urethane sheet as a flexible punch that is compatible with many shapes and sizes of holes, a more economical and simpler way of punching could be performed. The effects of the hardness and thickness in addition to the contact conditions between the metal sheet and the urethane sheet on the cut-out are examined in detail. The mechanism of the punching process using urethane as a punch is investigated and a suitable punching condition for making a simple circular hole is also proposed.