From the development and manufacturing experience of all kinds of metal stamping dies, it is known that the deep drawing dies are not easy to deal with, because the materials will flow, and sometimes the problem of stamping rebound is also very headache. At present, there is no accurate and reliable rebound calculation formula, which is generally based on experience, for different materials, different R angles to compensate. We are all clear about the influencing factors of springback. If we want to repair the mould, we can find the effective way to control springback
Influencing factors of springback of metal stamping parts
1. Mechanical properties of stamping materials
There are different strength metal stamping parts on the automobile body, from ordinary plate to high-strength plate, different plates have different yield strength, the higher the yield strength of the plate, the more prone to rebound, especially DP series dual phase high-strength steel.
2. Thickness of stamping material
In the forming process, the thickness of sheet metal has a great influence on the bending performance. With the increase of the thickness of sheet metal, the springback phenomenon will gradually decrease. This is because with the increase of the thickness of sheet metal, the materials involved in plastic deformation will increase, and then the elastic recovery deformation will also increase, so the springback will decrease.
With the continuous improvement of the strength level of thick sheet metal parts, the problem of dimensional accuracy caused by springback is becoming more and more serious. Both the mold design and the later process debugging require to know the nature and size of the springback of parts, so as to take corresponding countermeasures and remedial plans.
3. Shape and complexity of stamping parts
There are great differences in springback of parts with different shapes. For parts with complex shapes, a sequence of shaping is usually added to prevent springback from not forming in place. For some parts with special shapes, springback is more likely to occur, such as U-shaped parts. In the analysis of forming process, springback compensation must be considered.
4. Blank holder force of stripper plate of die parts
The blank holder force stamping process of die stripper is an important technological measure. By continuously optimizing the blank holder force, the material flow direction can be adjusted and the stress distribution inside the material can be improved. The increase of blank holder force can make the part drawing more fully, especially the position of side wall and R angle. If the part is fully formed, the internal and external stress difference will be reduced, so that the springback will be reduced.
5. Die drawbead
Die drawing rib is widely used in today's technology. Reasonable setting of drawing position can effectively change the direction of material flow and effectively distribute the feeding resistance on the pressing surface, so as to improve the formability of materials. Setting drawing rib on the parts prone to springback will make the parts more fully formed, more uniform stress distribution, and reduce the springback.
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