OS9-1-1 Full field optical measurement of large deformation fields in Single Point Incremental Forming (SPIF) Processes

Abstract

The Single Point Incremental Forming (SPIF) process is an interesting innovative production technique for industries involved in metal forming and metal stamping. SPIF is based on the relative movement of a simple small punch with respect to the blank. The advantages of SPIF are a high flexibility and the fact that there is no need for a die to obtain the final shape of components. Forming strategies in SPIF are strongly dependant on the formability of the used metals. Therefore, the optimization of forming parameters requires an understanding of the strain history during the SPIF process. The present paper reports the strain evolution observed by a Digital Image Correlation (DIC) technique in a partial cone with flanges of 50° during SPIF. The results show a bending/reverse bending mechanism when the tool approaches, passes and moves away from a given material point on the tool path. Also the large strains typical for a SPIF process are measured. The paper discusses how to solve some encountered technical problems and presents procedures to obtain reliable strain results during the DIC-SPIF experiment.