Influence of process parameters on deep drawing of AA6111 aluminum alloy at elevated temperatures

Abstract

To gain a deep insight into the hot drawing process of aluminum alloy sheet, simulations of cylindrical cup drawing at elevated temperatures were carried out with experimental validation. The influence of four important process parameters, namely, punch velocity, blank holder force (BHF), friction coefficient and initial forming temperature of blank on drawing characteristics (i.e. minimum thickness and thickness deviation) was investigated with the help of design of experiments (DOE), analysis of variance (ANOVA) and analysis of mean (ANOM). Based on the results of ANOVA, it is shown that the blank holder force has the greatest influence on minimum thickness. The importance of punch velocity for thickness deviation is 44.35% followed by BHF of 24.88%, friction coefficient of 15.77% and initial forming temperature of blank of 14.995%. After determining the significance of each factor on forming characteristics, how the individual parameter affects characteristics was further analyzed by ANOM.

Keywords

aluminum / process parameters / finite element method / hot drawing / analysis of variance / analysis of mean

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