| radial forging | |
Radial forging is an incremental forming process, where the total deformation is achieved by many individual forming steps. Each step is a transient process with evolution of contact, stress, strain and temperature fields. 3D numerical analyses of the process by standard Lagrangian kinematic descriptions are computationally very expensive due to the large number of strokes that must be analysed in order to evaluate thermomechanical conditions in the workpiece after the total deformation. To overcome this difficulty C3M has developed specialised numerical procedures that take advantage of periodic nature of the process in time and space. Furthermore, to keep the workpiece in the required temperature interval the induction heating may be applied in combination with forming process. C3M has developed advanced numerical algorithms that can treat this technology by multi-field coupling of mechanical, thermal and magnetic fields. This allows good predictions of thermo-mechanical cycles and optimisation of forming conditions to achieve beneficial micro-structural changes and densification of porous metals at micro level. Since 1992 C3M has analysed large variety of radial forming technologies from cold forging of tubes to hot forging of tool steels. The most advanced analyses include simulations of powder metallurgical process route for refractory metals (e.g. Mo, W) where polycrystall porous plasticity and microstructural changes can be taken into account. |
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