Browsing by Keyword "Incremental forming"
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Item Investigation of Thermal-Related Effects in Hot SPIF of Ti–6Al–4V Alloy(2019) Ortiz, Mikel; Penalva, Mariluz; Iriondo, Edurne; López de Lacalle, Luis Norberto; FABRIC_INTELThe present work focuses on a new approach to hot form hard-to-work materials by Single Point Incremental Forming (SPIF) technology using a global heating of the sheet. A set of trials was carried out in order to identify the optimum temperature cycles to minimize geometric distortions associated to each process stage on the fabrication of parts made of Ti–6Al–4V. On the one hand, heating trials allowed defining the optimal procedure to improve the temperature distribution homogeneity along the sheet and consequently to minimize its thermal distortion previous to the forming stage. On the other hand, the influence of both working temperature and the applied cooling on the geometric accuracy was evaluated by means of SPIF trials. For this purpose, a generic asymmetric design with typical aeronautical features was used. These trials pointed out that high forming temperatures allow reducing significantly the material springback whereas a controlled cooling (with an intermediate stress relief treatment) minimizes both the distortion of the part during the cooling and the mechanical stresses accumulated on the clamping system. Furthermore, the work includes a post-forming material evaluation to determinate the influence of the employed processing conditions on microcracks, alpha-case layer, microstructure and hardness.Item Kinematic and sensitivity analysis of rotary forging process by means of a simulation model(2008-07) Montoya, I.; Santos, M. T.; Pérez, I.; González, B.; Puigjaner, J. F.; SG; PROMETALNowadays, due to the environmental regulations, the automotive market is demanding more complex components and the utilization of new materials. In this context, and due to its wide range of advantages, rotary forging technology is a very promising metal forming alternative to the conventional forming techniques. In this paper, an analysis of the material, the stress and strain has been realized, in order to show a comparison between conventional and rotary forging and to understand the mechanisms of rotary forming.Item Theoretical and experimental analysis of the dieless incremental sheet forming process(2006-07-03) Cerro, I.; Maidagan, E.; Arana, J.; Rivero, A.; Rodríguez, P. P.; Centros PRE-FUSION TECNALIA - (FORMER); Tecnalia Research & Innovation; SGIncremental sheet forming (ISF) is a very promising technology to manufacture sheet metal products by the CNC controlled movement of a simple forming tool. Although it is a slow process, the cost reduction linked to the fact that punches or dies are avoided, makes it a very suitable process for low series production, in comparison with the traditional stamping or drawing processes. Nevertheless, the process still needs a further optimization to guarantee the reliability required for industrial applications. Process analysis based on experimental tests and modelling is required to analyse the effect of process parameters on the characteristics of incrementally formed parts and to go deeper in the understanding of the process itself. Therefore, this paper shows preliminary results obtained with experimental tests and a simple FEM model which gives accurate prediction of some characteristics of the formed parts.