Bending Die The Bending Die is a shape that bends the flat blank into an angle. Depending on the shape, precision and production volume of the part, there are many different types of molds, such as ordinary bending dies, cam bending dies, crimping dies, and circles. Arc bending die, bending...
The Bending Die is a shape that bends the flat blank into an angle. Depending on the shape, precision and production volume of the part, there are many different types of molds, such as ordinary bending dies, cam bending dies, crimping dies, and circles. Arc bending die, bending punching die and twisting die.
The basic movement of the bending process is that the unloading plate is first contacted with the sheet material and pressed, the punch mold is lowered to contact with the sheet material, and continues to descend into the concave mold, and the convex and concave molds and the sheet material are relatively moved, resulting in deformation of the sheet material. Bend, then the convex and concave molds are separated, and the ejector (or slider) on the curved concave die pushes out the curved edge to complete the bending motion.
The movement of the discharge plate and the ram is very critical. In order to ensure the quality of the bending or the production efficiency, the movement of the discharge plate must first be controlled so that it is in contact with the sheet before the punch and the pressing force must be sufficient. Otherwise, the bending member has poor dimensional accuracy and poor flatness; secondly, it should ensure that the ejector force is sufficient, so that it can smoothly push out the curved member, otherwise the bending member is deformed and the production efficiency is low. Special attention should be paid to curved parts with high precision requirements. It is best to have a motion dead point in the bending motion, that is, all relevant structural members can be killed.
Some workpieces have a strangely curved shape, or cannot be detached from the die in a normal manner after bending. In this case, a wedge structure or a revolving structure is often required. For example, a wedge structure can be used to complete less than 90 degrees or a hook. Bending, the cylindrical structure can be formed in one time by using the reversing structure.
It is worth mentioning that for some shell parts, such as computer floppy drive shells, because of the long curved side, the sliding between the elbow and the sheet, when bending, it is easy to wipe off the dander, the material galvanized layer falls off, frequently The effect of polishing the curved punch is also not ideal. The usual practice is to iron the bending punch to improve its smoothness and wear resistance; or to embed the roller at the R angle of the bending punch to convert the bending and sliding of the elbow and the sheet into rolling, due to the friction of the rolling ratio sliding The force is much smaller, so it is not easy to scratch the workpiece.