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Cold rolling of sheets

Rolling process in which a workpiece is pressed between rotating rollers to reduce its thickness without recrystallization of the material grain.

Illustration of Cold rolling of sheets

The process

The work piece [1], typically a sheet metal blank, is fed between rotating rollers [2] without preheating. The rolls compress the plate so that its thickness is reduced by up to 50%. Shape change is without recrystallization of the grains [3] which makes it a stronger material, while its surface becomes smoother. Because the grains do not recrystallize, material show anisotropic properties.

Advantages and disadvantages
In comparison with alternative methods
Provides high strength due to hardening
Improves surface finish, closer tolerances, thinner sections are possible
The grain structure is transformed
Material property different in different directions .
Requires more power