Spring back Reduction In Mechanically Formed Steel Plates By Bending Process

In this paper, a die shape optimization method for reduction of spring back defect due to elastic recovery behaviour in Sheet metal bending process is presented by using the reduced basis technique coupled by finite element and design of experiments methods. The primary objective of the proposed method is to reduce the enormous number of design variables required to define the initial die radius. The reduced basis technique is a weighted combination of several basis radiuses . The aim of the method is to find the best combination using the weights for each radius as the design variables. A multi-level design process is developed to find suitable basis radiuses at each level that can be used in the reduced basis technique. Each level is treated as a separated optimization problem until the required objective is achieved. The experimental design of Taguchi method is used to build the approximation model and to perform optimization. This method is demonstrated on the die radius optimization of Sheet metal bending .

Keywords:

Sheet Metal Bending , Die Design Optimization , Springback , An Integrated Method