Sheet metal terminology — bending along a curved axis In pressworking and fabrication, the operation of bending a sheet along a curved axis (to create contours, channels with curvature, or shells) is called:

Introduction / Context:
Sheet metal manufacturing uses specific terms for distinct operations. Correct terminology is essential for communicating tooling requirements, machine setups, and inspection criteria. Bending along a curved axis differs from simple straight-edge bending and often involves stretch-draw behavior to achieve smooth contours.

Given Data / Assumptions:

• Workpiece: sheet or strip.
• Action: bending along a curved axis, not a straight line.
• Goal: name the operation as used in shop practice and textbooks.

Concept / Approach:
“Forming” is the general term for shaping sheet metal into complex contours, including bending along curved axes, flanging, beading, and shallow drawing. It contrasts with cutting-type operations (slitting, notching) and with localized hole-making (piercing). Plunging is not a standard sheet metal cutting/bending term in this context; hemming is folding an edge onto itself, primarily for stiffness and safety.

Step-by-Step Solution:

Verification / Alternative check:
Manufacturing process references group curved-axis bending under forming operations and treat it separately from linear brake bends because of different springback and strain distributions.

Why Other Options Are Wrong:

• Plunging: nonstandard term for this context.
• Notching and slitting: removal of material, not bending.
• Hemming: edge folding, not general curved-axis bending.

Common Pitfalls:
Calling all bending “bending” without distinguishing curved-axis forming that requires different tooling (matched dies, stretch-wrap forming).

Final Answer: