Coining Operation In Sheet Metal

The restrike die operation fundamentally is a solid forming operation.

Coining operation in sheet metal.

How are bending flanging coining embossing stretching curling hemming ironing necking and drawing related. They all are common metal forming operations. A simple round metal slug is placed into the die and forced to flow into a given shape by compressing it see figure 3. The operation is carried out mostly for the purpose of stiffening flat panels the operation is also sometimes used for making.

Shear shearing blanking piercing and trimming 2. 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. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. For example medals coins and jewellery.

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 sheet metal coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die. Coining also can reduce the metal thickness. 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.

Coins metal currency are created with the coining process. In bending operations the sheet metal is subjected to both tensile and compressive stresses. Tension stretch forming 3. Metal forming operations include following operations.

Embossing embossing is an operation in which sheet metal is drawn to shallow depths with male and female matching dies. There is little if any spring back. 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. Find out more about these processes in this final installment of stamping expert art hedrick s sheet metal stamping series.

Coining can produce an inside radius as low as 0 4 t with a 5 t width of the v opening. The sheet metal operation depending on the type of stress induced.