Difference Between Blanking, Punching & Piercing in Sheet Metal

While working with sheet metal, this question always create some confusion. What is  difference between punching blanking and piercing ?

In this article, we will discuss blanking punching and piercing cutting operations.


As explained in above image, blanking operation produces a enclosed part from large piece of sheet metal. As a result blank part is used as final product.

For example disk or plane washers are manufactured with blanking operation. 


As explained above, punching operation removes scrap from the larger piece of sheet metal. As a result of punching, larger piece of sheet metal becomes final product.

In another words, Combination of punching operations deliver final product.  



As explained above, Piercing operation produces extruded hole or slot. As a result of applied force from piercing tool, sheet metal starts tearing and produces extruded hole/slot.

In another words, Piercing is combination of cutting and forming operation.

Conclusion :

To sum up, punching blanking and piercing are sheet metal cutting operations. Each Operation has different application.

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