Blanking Punching Piercing

Difference Between Blanking, Punching & Piercing in Sheet Metal

In sheet metal, this question always create some confusion. What is  difference between punching blanking and piercing ? Punching blanking and piercing are sheet metal shearing operations to modify existing blank. Same machines can be used to perform these operations. In this article, we will discuss how blanking punching and piercing operations are different from one another.

We suggest to read Sheet Metal Design Guidelines to Understand in detail about sheet metal design.

Blanking

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. 

Punching

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

In another words, Combination of punching operations modify existing blank/sheet using metal removing operations.  

Piercing 

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 operation gives shape to sheet metal blank/sheet.

Conclusion :

To sum up, Punching blanking and piercing are sheet metal shearing operations to modify existing blank. Same machines but different tools are used to perform these operations. You can learn more about sheet metal cutting operations here.

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