Papers by Author: G. Leonardo Manco

Abstract: In the last years, a number of studies on Incremental Sheet Forming have been focused on formability analysis and, in particular, on the development of models able to predict material response also in the design phase. Due to mechanics complexity, up to now process application is directly dependent on a preliminary experimental investigations based on the execution of trials and errors tests; a set of experiments, in fact, is necessary to determine the industrial feasibility. Of course this approach is very expensive and time consuming and, for this reason, new techniques to perform reliable guidelines for the designer are strongly requested. In the paper an effective statistical methodology has been applied with the aim to build a suitable base of knowledge minimising the number of experimental tests for identifying an optimal set of parameters which strongly impact on the process performance.

Abstract: The present work is focused on the investigation of the role of temperature and punch speed in warm deep drawing of AZ31 magnesium alloy. To this purpose, an experimental campaign, defined using a proper DOE approach, has been performed. The experimental results, in terms of the Limiting Drawing Ratio, have shown that drawability is strongly affected by the process parameters. In particular, Limiting Drawing Ratio exhibits the peak value at 250°C. As far as the effect of punch speed is concerned, it depends on temperature: at 200°C drawability increases with decreasing punch speed whilst a reverse behaviour is observed at 250 and 300°C. The experimental results have been analysed by ANOVA in order to evaluate the effect of the single independent factors and their interactions on the dependent one.