Coining Sheet Metal Bending

Air bending and coining are two of the most commonly used bending processes.

Coining sheet metal bending.

In this process the sheet or plate lays down flat on top of a die. The tonnage required by coining is 5 8 times higher than bottom bending. 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. The outside bend radius is in tension or being stretched.

Wipe bending or edge bending is another way to bend sheet metal edges. Coining also can reduce the metal thickness. Used for creating v u or channel shaped bends in ductile material usually sheet metal bending is a basic manufacturing process. This method produces excellent accuracy and repeatability and does not require sophisticated machines to execute.

It is important to make sure that the sheet is properly pushed onto the wipe die. The inside radius of the bent metal is in compression or being squeezed together. Coining is one of the most popular bending methods used in metal fabrication today. As a result the wipe die also determines the bend s inner radius.

The material is put under enough pressure that the punch tip penetrates the material and it begins to flow into the die. 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. 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.

Coins metal currency are created with the coining process. Operators use a press brake that features a punch and die to form the metal into specific angles. Unlike in coining punch tips never fully contact the workpiece in air bending. Coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and 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. Both compression and tension occur when bending sheet metal. Coining dies create the part s shape by squeezing the metal under extreme pressure. Coining is a very basic type of bending in which the work piece is stamped between the punch and die.