Study on the deformation behavior of polyamide under the backward extrusion process

Abstract

Abstract This study explores the deformation behavior of polyamide in the process of backward extrusion at room temperature by both finite element (FE) and design of experiment (DOE) procedures. The distributions of effective strain through the length and the thickness of processed polyamide tube by cold backward extrusion are investigated and compared with ductile metals. The die parameters are comprised of slope angle, corner radius of punch and container which are selected as input parameters. The Taguchi DOE approach is exploited in order to decrease repeated simulations, after which 16 results are carried out. Analysis of variance is performed on simulation results, and it is proved that the corner radius of punch has the greatest effect among die parameters in the mentioned process, in reducing the processing load. The influence of this parameter is obtained as 98%. Eventually, the optimum condition is proposed. Also, the deformation behavior and the probability of failure based on the normalized Cockroft-Latham criterion are studied under this condition.