Abstract
Abstract The introduction of the servo press in recent years has opened up options for metal stamping; within this context, enhancing material formability and reducing stamping time are important goals. Focusing on a case study of rectangular cup stamping, this study optimized the pulsating curve for a servo press. First, the forming depths, thinning ratios, and forming time resulting from a pulsating curve and a crank curve were compared. Experiment results indicated that the pulsating curve could produce 92.3 % greater forming depth and an 8% smaller thinning ratio at the same forming depth as the crank curve. Next, finite element software was used to optimize the lifting velocity, press-in velocity, lifting distance, and press-in distance of the pulsating curve with forming time, thinning ratio, and forming force as single objectives. For single-objective optimization, the smaller-the-better formula of the Taguchi method was used and the analysis values of the optimal parameter combinations were compared with the optimal analysis values of nine analysis. The optimal parameter combinations produced a shorter forming time (0.06 s less), a lower thinning ratio lower (0.1425 % less), and a smaller forming force (808 N smaller). Using ANOVA and multiple regression analysis, the influence of the four process parameters on the quality characteristics and derived their mathematical relationships were calculated and their mathematical relationships derived. Next, with forming time, thinning ratio, and forming force as the quality objectives, multi-objective optimization was conducted using the Taguchi method. The grey-entropy method, and grey relational analysis were also used. Experimental verification results revealed that the grey relational grade of the optimal parameter combination was higher than those of the nine analysis. Furthermore, lifting velocity exerted the greatest influence on the multiple quality characteristics with a contribution of 55.01 %.
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