Coining Process In Sheet Metal

Bottom bending has similarities to both air bending and coining.

Coining process in sheet metal.

Coining may be used to control surface quality and detail on parts. Benefits cnc controlled process with correction option slotting operations in individual steps. Coin production figure 8 1 indenting impressions into badges coining components for mechanical engineering and the electrical engineering industry figure 8 2. 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 coining process is preferred when there is a high tonnage. As a result of the high deformative stress the metal conforms to the shape of the die. Air bending is the most common type of bending process used in sheet metal in this process the work piece is only in contact with the edge of the die and the tip of the punch the benefits of air bending are as following. A simple round metal slug is placed into the die and forced to flow into a given shape by compressing it see figure 3.

High pressure is applied on the closed die containing the metal work piece. Coining dies create the part s shape by squeezing the metal under extreme pressure. In coining the thickness of the material in the starting stock is altered. 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.

During the coining process the material is put under enough pressure that the punch tip penetrates the material at the bottom of the bend and it begins to flow into the die. Metal coining is often a finishing process for manufactured products. Slotting coining forming sheet metal. Because the sheet metal flows during the process of coining the bend radius formed by coining is always equal to that of 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. In this process the die angle should match the intended. Coins metal currency are created with the coining process. Techniques of coining completely closed dies are used for this 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. Lubricants are not used in coining as they.