It always starts with a design. At Rompa Group we take many considerations into account and aim for a high-end design, whether this is for a complex part or straightforward part. There are nine basic processes involved in the actual stamping of metal parts, excluding phases such as design and prototyping, which are required prior to stamping.
Blanking is the initial stage in the stamping process if and when it is required. Blanking is the process of breaking down huge metal sheets or coils into smaller, more manageable pieces. When a stamped metal component is to be drawn or shaped, blanking is frequently done.
Piercing can be used to create slots, holes, or other cuts in a part. Piercing punches the required shapes out of the metal sheet and can be done simultaneously with blanking.
Bending is a process that is very self-explanatory. The part-in-progress is put on a specially built die, where a ram pushes against the metal to bend it. Because punching an already bent piece of metal causes the entire portion to deform, bending is done after drawing.
When a punch into a die bends the flat surface of a part into a V-shaped bend, this is known as air bending. The space between the punch and the die is bigger than the thickness of the metal, resulting in a bend that somewhat relaxes when the component is released. Air bending requires less force and power than other bending techniques.
In the metal stamping process, the actual stamping is called drawing. A punch pushes a piece of metal through a die, forming the part's basic shape. Shallow drawing refers to sections with a depth less than the principal opening; deep drawing refers to parts with a depth higher than the opening.
Bottoming and coining
Bottoming and coining are bending procedures that are similar to air bending except that the material is pressed fully into a tight-fitting die, resulting in a more permanent bent.
Pinch trimming is a method of separating a piece of metal from scrap metal by cutting it off the metal sheet. The metal is pressed against a flat vertical surface in an unusual procedure. It's commonly, but not always, used to cut deep drawn round cups from a sheet of paper.
Lancing is a sort of metal cutting that is used to create vents or tabs. A portion of a part is cut on three edges and bent at the same time. This not only generates the essential opening or hook-like feature, but it also removes the need for scrap collection or further machining.
Forming, like bending, bottoming, and coining, is a bending process. In one step, it makes pieces with multiple bends, such as U-bends.