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Metal Stamping/Punching/Bending
Metal stamping is a cold-forming process that makes use of dies and stamping presses to transform sheet metal into different shapes. Pieces of flat sheet metal, typically referred to as blanks, is fed into a sheet metal stamping press that uses a tool and die surface to form the metal into a new shape.Stamping operations are suitable for both short or long production runs, and be conducted with other metal forming operations.
Metal stamping, also referred to as pressing, is a low-cost high-speed manufacturing process that can produce a high volume of identical metal components.
Metal punching is typically a cold-forming process, but it can be used in some hot applications. This is one of the most cost-effective metal stamping techniques available. The process itself is inexpensive and fast enough to create savings for most manufacturing projects.
In punching operations, a scrap piece of material is removed as the punch enters the die, effectively leaving a hole in the workplace.Punching creates holes in workpieces using a punch press to force the punch tool through the sheet metal. This process creates holes in the metal sheet and deposits the scrap slug into the die below the sheet metal.
Metal bending refers to the general technique of forming metal into desired shapes such as L, U, or V-shaped profiles. The bending process for metal results in a plastic deformation which stresses above the yield point but below the tensile strength. Bending typically occurs around a single axis.
Bending processes transform metal sheets and two-dimensional workpieces into three-dimensional pieces. Bending occurs through multiple mechanisms. In some processes, one edge of the workpiece is clamped in a stationary position while the other edge is clamped by a metal tool and bent over a die to create a precise bend or shape. Alternatively, the metal piece may be pushed into or against a die.
When bending, it’s important to consider the plasticity of the metal, as each metal stamping material type can only handle a certain amount of bending before cracking or weakening. Many metals also harden under stress and can react poorly to too much bending. Metal pieces also typically need to be bent along the direction of their grain lines. This allows the metal to stretch and accommodate the bend instead of splitting and cracking between grain lines.
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