Coining Sheet Metal Bending

Unlike in coining punch tips never fully contact the workpiece in air bending.

Coining sheet metal bending.

Coining is a very basic type of bending in which the work piece is stamped between the punch and die. 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. Coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die. In this process the sheet or plate lays down flat on top of a die.

A simple round metal slug is placed into the die and forced to flow into a given shape by compressing it see figure 3. 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. This method produces excellent accuracy and repeatability and does not require sophisticated machines to execute. Coining is one of the most popular bending methods used in metal fabrication today.

It is important to make sure that the sheet is properly pushed onto the wipe die. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. The material is put under enough pressure that the punch tip penetrates the material and it begins to flow into the die. Coins metal currency are created with the coining process.

As a result the wipe die also determines the bend s inner radius. The coining not only featured high accuracy but also very small ir of the workpiece. Wipe bending or edge bending is another way to bend sheet metal edges. Both compression and tension occur when bending sheet metal.

The slack between the wipe die and the punch plays an important role in getting a good result. 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. 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. Bending can be defined simply as a forming operation in which the metal is deformed along a straight axis. The tonnage required by coining is 5 8 times higher than bottom bending. Coining dies create the part s shape by squeezing the metal under extreme pressure.