How to control the springback of metal stamping parts?

From the development and manufacturing experience of various metal stamping dies, it is known that drawing dies are relatively difficult to handle, because the material will flow, and the problem of stamping springback is sometimes a headache. There is no accurate and credible springback calculation. The formula is generally based on your experience, for different materials and different R angles to compensate. So what are the factors that affect the springback of metal stamping parts? 1. Mechanical properties of stamping materials. There are metal stamping parts with different strengths on the automobile body. From ordinary plates to high-strength plates, different plates have different yield strengths. The higher the yield strength of the plates, the easier the rebound phenomenon, especially DP Series of dual-phase high-strength steel. 2. The thickness of the stamping material 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, it participates in the plastic deformation of the material. As the increase, the elastic recovery deformation also increases, so the springback becomes smaller. With the continuous improvement of the material strength level of thick sheet metal parts, the problem of dimensional accuracy of parts caused by springback is becoming more and more serious. Mold design and later process debugging require an understanding of the nature and size of part springback in order to adopt Corresponding countermeasures and remedial plans. 3. The shape and complexity of stamping parts. 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 due to improper forming. Some parts with special shapes are more prone to springback. Phenomenon, such as U-shaped parts, in the analysis and forming process, springback compensation must be considered.　　4. Blank holder force of mold part stripper 　　 The stamping process of die stripper blank holder force is an important technological measure. By continuously optimizing the blank holder force, the material flow direction 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. Mold drawbeads Mold drawbeads are widely used in today's technology. 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. , Arranging drawbeads on parts that are prone to springback will make the parts more fully formed, more uniform stress distribution, and thus reduce springback.　　How to control the springback of metal stamping parts? 　　The best time to reduce or eliminate the springback of stamping is in the product design and mold development stage. With the aid of the early CAE rebound analysis, the amount of rebound is accurately predicted, the product design and process are optimized, and the product shape, process and compensation are used to reduce the rebound. In the hardware mold debugging stage, the mold must be tested strictly in accordance with the guidance of process analysis. Compared with ordinary SE analysis, the workload of springback analysis and correction has increased by 30% to 50%, but it can greatly shorten the mold debugging cycle. Springback is closely related to the drawing process. Under different drawing conditions (tonnage, stroke, feed volume, etc.), although the stamping parts have no forming problems, the springback after trimming will be more obvious. Springback analysis and drawing forming analysis are used The same software, but the key is how to set the analysis parameters and effectively evaluate the rebound results. Hardware, from quality inspection of raw materials for stamping parts, to mold design, processing, assembly, to the first product, mass production, is a one-to-one customized service to ensure that every small metal stamping part matches your product. Strict control Implementation of high-standard system to reshape the quality of metal stamping and comprehensive quality management to meet production needs and customer requirements