Coining Sheet Metal Bending

Operators use a press brake that features a punch and die to form the metal into specific angles.

Coining sheet metal bending. Coining is a very basic type of bending in which the work piece is stamped between the punch and die. As a result the wipe die also determines the bend s inner radius. Wipe bending or edge bending is another way to bend sheet metal edges. Coins metal currency are created with the coining process.

Coining is one of the most popular bending methods used in metal fabrication today. Both compression and tension occur when bending sheet metal. Air bending and coining are two of the most commonly used bending processes. Used for creating v u or channel shaped bends in ductile material usually sheet metal bending is a basic manufacturing process.

Coining dies create the part s shape by squeezing the metal under extreme pressure. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. The outside bend radius is in tension or being stretched. In this process the sheet or plate lays down flat on top of a die.

Unlike in coining punch tips never fully contact the workpiece in air bending. A simple round metal slug is placed into the die and forced to flow into a given shape by compressing it see figure 3. This method produces excellent accuracy and repeatability and does not require sophisticated machines to execute. Coining also can reduce the metal thickness.

The tonnage required by coining is 5 8 times higher than bottom bending. The material is put under enough pressure that the punch tip penetrates the material and it begins to flow into the die. The slack between the wipe die and the punch plays an important role in getting a good result. Coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die.

The inside radius of the bent metal is in compression or being squeezed together. It is important to make sure that the sheet is properly pushed onto the wipe die. In coining the sheet metal is not just been bent it s actually tinned by the compress between the punch and die. In coining the sheet metal is more than just bent it is actually thinned by the impact of the punch and die as it is compressed between them along the bending surfaces fig.