Influence of process and tool parameters on springback of high-strength steels

Abstract

The advanced high-strength steels have become an interesting alternative in automotive industry to reduce vehicle weight and therefore reduce fuel consumption. However, its wide application in the automotive industry is still limited due to challenges in formability, tool life and springback. The springback is pointed out in literature as the main problem that involves the mass production of structural components, and the aspects that show influence are still not fully understood. This work aims to statistically analyze the influence of process and tool parameters on the magnitude of the springback on five high-strength steels. In order to do so, the U-bending test was used and two process parameters and two tool parameters that are mentioned in the literature as the most influential were chosen. The results of the analysis of variance pointed out the influence of the blank holder force as the parameter of greatest influence on springback, followed by the tool radius and friction condition.