Coining Sheet Metal Bending

Both compression and tension occur when bending sheet metal.

Coining sheet metal bending.

In this process the sheet or plate lays down flat on top of a die. The outside bend radius is in tension or being stretched. The inside radius of the bent metal is in compression or being squeezed together. Coining is a very basic type of bending in which the work piece is stamped between the punch and die.

Coins metal currency are created with the coining process. 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. The tonnage required by coining is 5 8 times higher than bottom bending. Unlike in coining punch tips never fully contact the workpiece in air bending.

In coining the sheet metal is not just been bent it s actually tinned by the compress between the punch and die. Coining also can reduce the metal thickness. This method produces excellent accuracy and repeatability and does not require sophisticated machines to execute. The slack between the wipe die and the punch plays an important role in getting a good result.

The coining not only featured high accuracy but also very small ir of the workpiece. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. As a result the wipe die also determines the bend s inner radius. A simple round metal slug is placed into the die and forced to flow into a given shape by compressing it see figure 3.

Wipe bending or edge bending is another way to bend sheet metal edges. The term coining comes from the idea that when it comes to money each metal coin is made exactly the same as the last despite being mass produced. It is important to make sure that the sheet is properly pushed onto the wipe die. The material is put under enough pressure that the punch tip penetrates the material and it begins to flow into the die.

Operators use a press brake that features a punch and die to form the metal into specific angles. Bending can be defined simply as a forming operation in which the metal is deformed along a straight axis. Coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die. Used for creating v u or channel shaped bends in ductile material usually sheet metal bending is a basic manufacturing process.