Manufacturing of Rotational Toroidal Shells in Coin Minting
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The forming process is related to the conventional external inversion of tube ends with some modifications that result in different deformation mechanics from those of conventional tube forming. Different techniques are analysed to identify the values of the major process variables that allow us to obtain sound hollow toroidal shells with free rotation of the coin blank. The work approach consists of finite element modelling that is complemented by experimentation to evaluate the overall influence of the main parameters in the joining process.