Notching and Shaving Operation

Notching

The operations which eliminate material from either or both edges of strip are called notching. Notching is used to shape the outer counter of workpiece in a progressive die. It also eliminates excess material before drawing or forming operation in a progressive die. Figure illustrates the principle of parting and notching operations.

Shaving

The operation in which the surface of previously cut edge is smoothly finished to accurate dimension is called as shaving. Shaving is a secondary operation as it is usually done after punching. Figure depicted the principle of shaving operation.

Figure: Principle of Shaving Operation

In trimming, the distorted excess material is eliminated from drawn shapes and it results in smoothing the edge achieved after blanking operation.