A fundamental study of incremental deep drawing process

Deals with an investigation into the features of an incremental deep drawing process. On a newly developed incremental deep drawing set-up, aluminium sheets are formed to circular cups of various sizes. Deep-drawing is carried out incrementally with a set of tools with common shapes. Process parameters studied are drawing ratio, formed cup size, the vertical and horizontal displacements of the punch in one step relative to the blank. It is thereby shown that LDR depends on the cup size and that fracture occurs at the blank either near the punch shoulder or die shoulder depending on the forming conditions. A fracture mode diagram is thus obtained, where regions or conditions for successful deep-drawing and for fracture occurrence at either portion of the blank are clearly seen. Strain distributions are measured by a scribed circle method with the aid of a common fabrication process for photo lithography.