Coining Sheet Metal Bending

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 sheet metal bending.

Commonly used equipment include box and pan brakes brake presses and other specialized machine presses typical products that are made like this are boxes such as electrical enclosures and rectangular ductwork. The inside radius of the bent metal is in compression or being squeezed together. There are three types of bends used to form metal that any sheet metal engineer or press brake operator must be familiar with. This is done through the application of force on a workpiece.

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. This is mainly for the purpose of reducing the ir of the workpiece so as to reduce the stamping into ir position of the workpiece by the punch tip. Bending is a manufacturing process that produces a v shape u shape or channel shape along a straight axis in ductile materials most commonly sheet metal. 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. Both the punch tip and the punch actually penetrate into the metal past the neutral axis under a high amount of pressure. All forming operations deform sheet material by exposing it to tension compression or both. Both compression and tension occur when bending sheet metal.

The force must exceed the material s yield strength to achieve a plastic deformation. Bending can be defined simply as a forming operation in which the metal is deformed along a straight axis. Most part defects such as splits and wrinkles occur in forming operations. Coining sheet metal coining fabrication is a basic type of bending in which the workpiece is stamped between the punch and die.

The v opening width required by coining is smaller than bottom bending generally is 5x the thickness of sheet metal. Air bending is the most common type of bending process used in sheet metal shops today. The outside bend radius is in tension or being stretched. Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape.

Successful sheet metal forming relies heavily on the metal s mechanical properties.