Coining Sheet Metal Bending

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

Coining sheet metal bending.

Coins metal currency are created with the coining process. The material is put under enough pressure that the punch tip penetrates the material and it begins to flow into the die. Coining also can reduce the metal thickness. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure.

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. 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. Both compression and tension occur when bending sheet metal.

Coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die. Coining dies create the part s shape by squeezing the metal under extreme pressure. The tonnage required by coining is 5 8 times higher than bottom bending. This method produces excellent accuracy and repeatability and does not require sophisticated machines to execute.

The outside bend radius is in tension or being stretched. Bending can be defined simply as a forming operation in which the metal is deformed along a straight axis. Operators use a press brake that features a punch and die to form the metal into specific angles. The inside radius of the bent metal is in compression or being squeezed together.

The slack between the wipe die and the punch plays an important role in getting a good result. 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. 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.

Coining is a very basic type of bending in which the work piece is stamped between the punch and die. In coining the sheet metal is not just been bent it s actually tinned by the compress between the punch and die. In this process the sheet or plate lays down flat on top of a die. The coining not only featured high accuracy but also very small ir of the workpiece.