Open AccessPrediction of the limiting redrawing ratio
Author(s) -
Xiaohu Zhou,
Lu Lu,
Fengjun Wang,
Bangjun Ding,
Wen Zi Gong
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/688/3/033038
Subject(s) - die (integrated circuit) , cylinder , deep drawing , radius , limiting , bending , materials science , anisotropy , geometry , finite element method , composite material , structural engineering , mathematics , mechanical engineering , optics , physics , engineering , computer science , computer security , nanotechnology
Redrawing process is used for reducing the lateral dimensions and increasing the depth of the cylinder cup, which was formed by deep drawing. To determine the optimum values of the process parameters, it is necessary to know the redrawability. In this paper, a new mathematical mode is established to predict the limiting redrawing ratio (LDR), which is based on Hill’s anisotropic criteria, tensile instability in the cup wall and sheet bending/unbending theory around the die arc radius. The maximum and minimum thickness ratio (t max /t min ) of cup wall and friction effect were considered in the model. The calculation from the model is in good agreement with the results of finite element simulation, and also was confirmed by the experiments of commercially pure titanium (TA1) cup redrawing processing. The effects of various material properties, friction coefficient μ, radius of the die arc r d , half die cone anger α, half die opening r o , cup maximum thickness t max , cup thickness ration t max /t min have been discussed to understand and control redrawing process for improving redrawablity.