CAE rebound analysis of automotive precision stamping parts and industry countermeasures 'hardware'

Springback is a difficult problem to solve for automotive precision stamping parts, especially high-strength steel materials with a yield strength of 600Mpa or more. At present, there is no thorough method to solve the springback of stamping parts. We need to address the springback problem of metal stamping parts. Further in-depth research. So what are the factors that affect the springback of automotive precision stamping parts? The author sorted out some of them below: 1. The material properties of automotive stamping parts have different strengths, from ordinary plates to high-strength plates, and different plates have different yield strengths. , The higher the yield strength of the plate, the easier it is to spring back. For example, S500MC and DP780 are high-strength steel plates with good cold forming properties. 2. Material thickness During the forming process, the thickness of the sheet has a great influence on the bending performance. As the thickness of the sheet increases, the springback phenomenon will gradually decrease. This is because as the thickness of the sheet increases, the material involved in plastic deformation increases. , And the elastic recovery deformation also increases, so the springback becomes smaller. 3. The springback of parts with different shapes is very different. For parts with complex shapes, a sequence of shaping is generally added to prevent springback when forming is not in place. Some parts with special shapes are more prone to springback, such as U In the analysis and forming process, springback compensation must be considered for the shaped parts. At present, European and American customers generally require that the springback compensation should be handled in the process design stage of the stamping die, so that the springback should be within the tolerance range of the product. 4. The blank holder force of the part blank holder force The stamping process is an important technological measure. By continuously optimizing the blank holder force, the flow direction of the material can be adjusted and the internal stress distribution of the material can be improved. The increase of blank holder force can make the part drawing more fully, especially the part side wall and the R angle position. If the forming is sufficient, the internal and external stress difference will be reduced, so that the springback will be reduced. 5. Drawbeads Drawbeads are widely used in today's processes. The reasonable setting of the drawing position can effectively change the direction of material flow and effectively distribute the feed resistance on the pressing surface, thereby improving the formability of the material. The setting of drawbeads on the parts that are prone to springback will make the parts more fully formed, the stress distribution will be more uniform, and the springback will be reduced. Based on the above analysis of the springback of automotive precision stamping parts and countermeasures, in order to save the time of mold adjustment and reduce the cost of subsequent mold changes, before the automotive mold stamping process is determined, it is generally necessary to use CAE simulation software for springback analysis and rebound Compensation and constant revision, commonly used software includes Autoform, Danaform and JStamp, etc.