Critical conditions of wrinkling in deep drawing at elevated temperature

摘要

A theoretical model has been developed to predict the critical conditions of wrinkling and the number of wrinkles, both at room temperature and elevated temperature, in the deep-drawing process. The equilibrium of moments acting on a segment ofwrinkled flange is applied to examine the critical conditions of wrinkling. The critical conditions where wrinkling is formed are determined for the cases with a blank holder and without a blank holder. The results of the theoretical solution are compared with the experimental results at ambient and elevated temperatures, good agreement being found.