Stamping technology
Regarding the punching process technology, take punching as an example. Usually, due to the characteristics of the material itself, half of the cross-section of the punched surface is the torn surface. However, using circular holes usually requires all parts to be smooth. In order to meet this requirement, stamping technology has developed many different methods, such as first stamping and then scraping to remove tears left by the cracked surface due to stamping. You can also trim the right angle edges of the stamping die to very small circular edges, or apply significant computational pressure to the materials around the punched parts, and then perform precise blanking and punching. Different stamping methods have different stamping surface quality and production costs.
When a part is bent, scratches are usually caused by friction between the mold and the material. At this time, you may think that the relative movement between the mold and the plate should be less than the sliding friction during rolling friction. That's right, adding a roller to the part where the bending punch comes into contact with the blank can effectively improve the scratch problem. In addition, you may also have experience. When you bend something, you usually notice that it bounces back a bit. This is because every material is elastic. This problem can also occur when metal is bent. Stamping engineering has also developed various methods to improve this issue.
The most direct method to ensure that the formed parts have the correct dimensions and are perfectly assembled and matched with other parts is to "flip" them. For example, if the material rebounds 2 degrees when bent at a right angle, it can be bent to 88 degrees during the bending process. When the mold leaves the blank, the workpiece will rebound to the target value of 90 degrees. Due to the plastic deformation of the bent part, the material will rebound, resulting in internal stress in that area. During demolding, internal stress causes the material to recover and cause rebound. Therefore, the mold is used to compress the area to break its stress. Status can also effectively overcome this problem. You can also bend 45 degrees first, and then bend 90 degrees after partial rebound.
Therefore, regarding drawing a cup shaped can, imagine if a larger diameter can is willing to shrink into a smaller diameter space? The external blank material and internal tank body resist each other under tension, and improper design can lead to material damage to the mold. Therefore, how to choose gradually smaller diameters and rounded corners at the mold entrance, and develop design standards using different materials, is his profound knowledge in extension engineering. In global competition, stamping technology has undergone significant development and development in order to improve product quality while also being competitive.
