Effects of elastic behaviours of dies and servo press machine on deep drawing process

Various characteristic features of elastic deformation of dies and presses during deep drawing were presented. It was very important to examine the effects of elastic deformation of these units on product accuracy. Strains were measured on the press system including dies, a slide and a bolster of a servo press. A strain magnitude of 63 times 10^-6 was obtained when the overall slide position was at the lowest point. Two slide motions of the servo press were selected to determine appropriate manufacturing conditions. An elastic deformation analysis of the die structure was then required by CAD simulation. To find the appropriate die structure model, the vertical displacement of the die structure in the CAD simulation only was compared to the experiment results. It was found that the vertical displacement of the die structure was 0.176 mm at the top surface of the die considering elastic deformation of the die structure as well as the bolster of the servo press.