Studying Formability Limits By Combining Conventional and Incremental Sheet Forming Process

Chinese Journal of Mechanical Engineering

Ricardo Alves de Sousa¹  Fabio Andre Lora²  Lirio Schaffer³  Daniel Fritzen⁴ 

[1] Center of Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal;Department of Materials Engineering, Federal University of Recôncavo da Bahia, Campus CETENS, 44085-132, Feira de Santana, Bahia, Brazil;Federal University of Rio Grande do Sul, Porto Alegre, Brazil;SATC University, Criciuma, Brazil;

关键词: Hybrid forming process;    Incremental sheet forming;    Strain paths;    Numerical simulation;   

DOI  :  10.1186/s10033-021-00562-7

来源: Springer

【 摘 要 】

In this work it is assessed the potential of combining conventional and incremental sheet forming processes in a same sheet of metal. This so-called hybrid forming approach is performed through the manufacture of a pre-forming by conventional forming, followed by incremental sheet forming. The main objective is analyzing strain evolution. The pre-forming induced in the conventional forming stage will determine the strain paths, directly influencing the strains produced by the incremental process. To conduct the study, in the conventional processes, strains were imposed in three different ways with distinct true strains. At the incremental stage, the pyramid strategy was adopted with different wall slopes. From the experiments, the true strains and the final geometries were analyzed. Numerical simulation was also employed for the sake of comparison and correlation with the measured data. It could be observed that single-stretch pre-strain was directly proportional to the maximum incremental strains achieved, whereas samples subjected to biaxial pre-strain influenced the formability according to the degree of pre-strain applied. Pre-strain driven by the prior deep-drawing operation did not result, in this particular geometry, in increased formability.

【 授权许可】

CC BY