Metal Cutting Processes: What is Blanking and Piercing?

Cutting metal

Blanking has been one of the processes, along with piercing, that helps remove metal work pieces from the principal metal sheet. Blanking is a process which allows metal fabricators to create pieces from a steel sheet. The remaining pieces are considered scrapings.

Piercing is another process of metal fabrication. It removes all portions that are useless while the remaining metal sheet or steel coil is considered useful.

Whether it is blanking or piercing, there are clear and understandable effects that fabricators try to minimize. When it comes to blanking and piercing, there are two basic problems fabricators face.

Rollovers and burr excesses

Blanking, in a high production process, would control the quality of metal work pieces from the moment the process begins. But the entire procedure includes generating excess rollovers and burr.

Excessive rollover is created when the metal is punched too much and the material “rolls over” the edge. A burr is formed when there is a raised edge or small piece of the material on the edge of the formed work piece. These are defects during the blanking process.

Residual cracks

Cracks are another possible defect during the blanking process. The sheet metal sometimes deforms and cracks due to tensile stress.

The die cut edge and shearing process can create fractures both on the metal sheet and work piece. These cracks form because sometimes the material used does not have the strength to withstand the force of the fabricating process. For example, aluminum and steel can cause residual cracks are foreseeable.

Blanking and other metal cutting processes are meant to make work pieces from steel coil and metal sheets. These workpieces will be used in various and manufacturing industries.Though defects are inevitable, you should make sure that the process you use will minimize such incidents.

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