Sheet-metal operations — choosing the right term The operation of cutting a flat sheet to obtain the desired external shape (the cut-out is the product) is called:

Introduction / Context:
Many sheet-metal cutting operations look similar but differ in objective. Knowing whether the removed portion or the remaining sheet is the product determines the correct terminology and die design.

Given Data / Assumptions:

• A flat sheet is cut to a required outer profile.
• The detached piece is the useful product (e.g., a washer blank).
• Conventional punch-and-die press tools are used.

Concept / Approach:
In blanking, the blank (cut-out) is the desired part, while the surrounding sheet becomes scrap. In punching/piercing, the hole is desired and the slug is scrap. Shearing is a straight-line cut separating sheets; nibbling removes small bits successively to create complex shapes.

Step-by-Step Solution:
Identify the product: the detached piece (blank) is required.Match with operation: blanking produces the blank as the product.Therefore select 'blanking'.

Verification / Alternative check:
Die sets for blanking have specific clearances and often require hold-downs/stripper plates to control the blank and ensure good edge quality; process sheets label the operation as blanking when the blank is the part.

Why Other Options Are Wrong:
Punching/piercing prioritize the hole; shearing is not profile blanking; nibbling is a progressive contouring method with different intent and finish.

Common Pitfalls:
Using 'punching' as a generic term for all press cuts; forgetting that cutting clearance and die wear affect edge rollover and burr, impacting blank dimensions.

Final Answer:
blanking