Difference Between Blanking, Punching & Piercing in Sheet Metal

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In sheet metal, this question always creates some confusion. What is the 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 you read Sheet Metal Design Guidelines to Understand in detail about sheet metal design.

Blanking

The blanking operation produces an enclosed part from a large piece of sheet metal.

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

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

Punching

punching operation removes scrap from the larger piece of sheet metal.

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, a larger piece of sheet metal becomes the final product.

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

Piercing 

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

In other words, Piercing operation produces an extruded hole in sheet metal.

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.

Got Questions?  We will be happy to help.

If you think we missed Something?  You can add to this article by sending a message in the comment box. We will do our best to add it in this post.


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