Abstract
Optimization the process parameters in hydromechanical deep drawing (HDD) of trapezoid cup is an important task for reducing production cost. To determine the optimum values of the process parameters, it is essential to determine their influence on the deformation behavior of the sheet metal. The most important process parameters for affecting thickness distribution of a trapezoid cup, namely punch speed, chamber pressure and friction coefficient, were determined. The Finite element method (FEM) combined with the Taguchi method served as a predictive tool to determine the influence parameters. FEM and the Taguchi method were used to identify the influence of each parameter considered in this study. The simulation was carried out with an orthogonal array (L9) of the Taguchi method. Based on analysis signal to noise and analysis of variance tests, it was found that optimal values of parameters are pressure at level 2 (8.5 MPa), friction coefficient at level 1 (0.005) and punch speed at level 2 (7500 m/s). Among these factors, friction efficiency has the greatest effect on thickness distribution in the HDD of the trapezoid cup.
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