Numerical Simulation And Experimental Research On Springback Of High-Strength Steel Flanging

The competition of automobile market is very fierce nowdays. Since the development of the automobile industry is toward more environmental and safer. This accelerates the lightweight progress. High-strength steel gradually becomes popular lightweight materials which is essential in the automobile industry. The springback of high-strength steel is necessary to be researched because it greatly influences the forming accuracy and cannot satisfy the security requirements. In previous studies, the springback of curved parts is the main research object. However, the springback of automobile flanging parts needs more attention under the demanding for welding and assembly. These studys are also helpful to optimize stamping process, adjust the structure of mould and control the quality of the products.This paper discussed the springback of different types of flanging deformation through experiments and finite element simulation method. Numerical simulation used the software, DYNAFORM for calculating and measuring springback. The result of the experiment used ARGUS sheet forming strain measurement and analysis system for measuring springback of the flanging part. Then Verifing the reliability of finite element simulation for further studies by comparing the experimental results and finite element simulation results.The flanging type included plane curve flanging and surface curved flanging on a total of six in this paper. For plane curve flanging, a total of two kinds, studing the influence law of springback with different flanging radius and flanging height. For surface curved flanging, a total of four kinds, studing the influence law of springback with different flanging radius, bending radius and flanging height. Studies have shown that for plane curve flanging, with a certain flanging type and flanging radius, major springback increased with flanging height increased within the limits of flanging height range. For surface curved flanging, with a certain flanging type, flanging radius and bending radius, major springback also increased with flanging height increased within the limits of flanging height range. The result of finite element simulation was accurate and reliable by comparing the experimental results and finite element simulation results.Finally using the orthogonal experiment design method to design different types of flanging experiment. The results of springback were calculated and measured by using DYNAFORM. Orthogonal test table indicated that the main affecting factors of flanging springback and its influence law which provided strong guidance for practical production.