Finite Element Analysis of In Plane Bending of Strip Metal under Unequal Compressing

In Ref. <1>, we stated that we could develop into an advanced process in plane bending of strip metal with unequal compressing achieved with conical rollers. In Ref. <2>, we established a model for the process. Eq.(2) in this paper is the above mentioned model. Eq.(2) contains a number of undetermined coefficients C i (where subscript i denotes the i th point along the compressed width of strip metal, i=1,2,…,N ), where C i describes the contribution of compression deformation at i th point to in plane bending. Using rigid plastic finite element method, we obtained the C i coefficients in Fig.5, which shows that the value of C i linearly increases from the point with less compression deformation to the point with greater compression deformation. With C i known, we can compute the radius of curvature. Using specific numerical data given in Table 3, with N=6 in Eq.(2), we obtained R ina (computed or analytical inner radius of curvature) which differs from R ine (experimental inner radius of curvature) by a maximum of 9.1% in nine different tests. It appears N6 gives sufficient accuracy for the prediction of radius of curvature. The results are helpful to the understanding of the positive role of unequal deformation in metal forming processes .