Definition
A metal-forming process in which metal is shaped and finished by passing it between rollers at a temperature below its recrystallization point, usually room temperature. Cold rolling improves surface finish, increases dimensional accuracy, and work-hardens the metal, raising its strength and hardness while reducing ductility.
Plain English
Squeezing metal between heavy rollers while it is cold (not heated) to make it thinner, smoother, and stronger.
Context Anchor
Seen in aircraft maintenance and sheet-metal discussions, especially when describing how aluminum sheet or other aircraft metal stock was made.
Derivation
From 'cold' (without applied heat) and 'rolling' (passing between rollers). The name distinguishes the process from hot rolling, where the metal is heated until soft before being shaped.
Why Pilots Care
Cold-rolled parts provide the strength and fatigue resistance needed in aircraft structures without introducing heat-related weaknesses.
Analogy
It is like rolling out dough with a rolling pin, except the material is metal and the rolling changes the metal’s strength as well as its shape.
Intuition Check
Do not read “cold” as meaning frozen or specially chilled. Here it means the metal is formed without high heat, usually at or near room temperature.
Example Sentence 1
The aluminum sheet used for the skin was cold rolled to give it a smooth surface and consistent thickness.
Example Sentence 2
Cold rolling the steel stock produced a smoother surface than hot rolling would have given.