Automobiles are made up of thousands of stamping parts during the manufacturing process. The stamping parts need to be composed of all kinds of metal stamping parts, precision hardware accessories, electronic components and so on.
The manufacturing quality of stamping parts has a great influence on the quality of the whole vehicle, and it is particularly important for cars and various types of passenger cars. In the manufacture of stamping parts, it is more appropriate to use professional inspections for large stamping parts, interior parts, welders with complicated space geometries, or easy small stamping parts, interior parts, etc. Fixtures (referred to as inspection tools) are used as an important inspection method to control the quality of products between programs. Inspection tool inspection has the advantages of rapid, accurate, intuitive and convenient, especially suitable for the needs of mass production. After the mid-1980s, along with the rapid development of the car and bus industries, the use of stamping parts inspection tools in the Chinese automotive industry has become quite common.
The springback of metal stamping parts is a difficult problem for automotive stamping parts. At present, there is no perfect method to cure stamping parts springback. We need to further study the problem of stamping parts springback. What are the factors of rebound?
1. Material properties
There are different strength stamping parts on the car body, from ordinary plate to high-strength plate. Different plates have different yield strength. The higher the yield strength of the plate, the more likely the rebound phenomenon will occur.
2. Material thickness
In the forming process, the thickness of the sheet material has a great influence on the bending performance. As the thickness of the sheet material increases, the rebound phenomenon will gradually decrease. This is because as the thickness of the sheet material increases, the materials participating in the plastic deformation increase, and thus the elastic recovery The deformation also increases, so the springback becomes smaller.
3. Part shape
The springback of parts of different shapes is very different. Parts with complex shapes generally add a sequence of shaping to prevent springback phenomenon when the forming is not in place, and some parts with special shapes are more prone to springback, such as U-shaped parts, In the analysis and forming process, the springback compensation must be considered.
4. Part blank holding force
Blank-holding force stamping process is an important technological measure. By continuously optimizing the blank-holding force, the material flow direction can be adjusted and the internal stress distribution of the material can be improved. The increased blank holding force can make the part draw more fully, especially the position of the side wall of the part and the angle of R. If the forming is sufficient, the difference between the internal and external stress will be reduced, thereby reducing the springback.
5. Drawbead
Drawing ribs are widely used in today’s technology. Reasonably setting the drawing position can effectively change the direction of material flow and effectively distribute the feeding resistance on the pressing surface, thereby improving the formability of the material. The provision of drawbeads on the parts will make the parts more fully formed, the stress distribution will be more uniform, and the springback will be reduced.
