A new rolling–extrusion technology for the forming of the hollow cylindrical component

In this study, a new rolling–extrusion technology implementing plastic deformation is presented for the forming of the hollow cylindrical component, and the design criterion of the rollers with changeable internal diameter is introduced based on the prediction of the forward slip value. Moreover, in order to investigate the feasibility of this technology, a finite element (FE) simulation and an experiment are conducted. The result of the FE simulation shows that: the metal flow is caused only in the area where the rollers contact the billet, and influenced by the heat exchange between the billet and the rollers; a set of most reasonable technological parameters is selected through an evaluation of the deformation uniformity of 18 groups of simulations. In addition, the result of the experiment shows that the hollow cylindrical component can be formed, and the consumption for the material of each component can be saved at least 16.8 %.

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