Studies on Predicting Spring-Back and Verifying the Effects of Temperature, Sheet Thickness and Punch Speed on Forming Force of V-Bending for SS400 Steel Plate

Abstract

The sheet metal forming process is a basic deformation method in the mechanical field. In particular, bending deformation processing is a universal processing method that is widely used to form sheet metal parts such as the aviation industry, shipbuilding, automotive and so on. During the sheet metal bending process, the spring-back and forming force are very important output parameters that need to be determined to ensure the accuracy and load capacity of machining equipment. To predict the spring-back of V-bending process for SS400 sheet material, various hardening models have been imported into FEM simulation software in order to predict and compare with corresponding experimental results of SS400 sheet material. To simulate spring-back of V-bending, the deformed results of V-shape from the forming simulation in Abaqus/Explicit should be imported into Abaqus/Standard, and then a static analysis will calculate the spring-back of V-bending. The results showed both hardening laws were in good agreement with experimental results due to the thick sheet of material. Moreover, the forming force magnitude of V-bending will vary according to machining conditions, geometric shapes of products, sheet materials, etc. Then, this study verifies the effect of technological and geometric parameters such as elevated temperature, punch speed and sheet thickness to bending force when forming a V-shape of SS400 sheet material and selects the optimum parameters using Taguchi design and ANOVA method.