Upsetting of brass billets by flat dies

Abstract

Upsetting processes belong to the class of elemental bulk metal forming operations. Many multi stage forming processes include upsetting as one of the operations. Upsetting processes also can be used for determination of forming limit diagram. Forming limit diagram (FLD) allows design and optimization of number of phases at forming process and also expresses possibility of material to be deformed in different stress-state condition. Present paper investigates formability of brass in cold upsetting processes. Four different tests (basic cylinder test, tapered test, collar cylinder test and Rastegajev test) were applied. The aim of investigation was to determine forming limit diagram for this material. Dies applied in experiment were flat plates. Strain path and history of deformation were determined experimentally for different types of billets. Forming limit diagram for brass was designed using experimental data.