Coining Operation In Sheet Metal

It is a process of pressing metal in a die so that it flows into the die space.

Coining operation in sheet metal.

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. It is a metal forming operation in which the straight metal sheet is transformed into a curved form. Coins metal currency are created with the coining process. A beneficial feature is that in some metals the plastic flow reduces surface grain size and work hardens the surface while the material deeper in the part retains its toughness and ductility the term comes from the initial use of the.

The theory behind coining is that with enough tonnage your sheet metal will bend to the precise angle of your tooling so your tooling should be an equal match to. Coining can produce an inside radius as low as 0 4 t with a 5 t width of the v opening. Coining also can reduce the metal thickness. They all are common metal forming operations.

The restrike die operation fundamentally is a solid forming operation. In coining the top tool forces the material into the bottom die with 5 to 30 times the force of air bending causing permanent deformation through the sheet. Shear shearing blanking piercing and trimming 2. The sheet metal operation depending on the type of stress induced.

How are bending flanging coining embossing stretching curling hemming ironing necking and drawing related. Embossing embossing is an operation in which sheet metal is drawn to shallow depths with male and female matching dies. Coining is a form of precision stamping in which a workpiece is subjected to a sufficiently high stress to induce plastic flow on the surface of the material. 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 the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. Tension stretch forming 3. There is little if any spring back. Metal forming operations include following operations.

For example medals coins and jewellery. Coining sheet metal coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die.