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Factors affecting the rebound of car metal stamping parts_
1. Material properties There are stamping parts with different strengths on the car body. From ordinary plates to high-strength plates, different plates have different yield strengths. The higher the yield strength of the plate, the easier it is to spring back. 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 of the forming process, the springback compensation must be considered. 4. The blank holder force of the part blank holder force The stamping forming 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. A 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.