2006-11-24 07:51:45 · 5 answers · asked by akita 1 in Science & Mathematics ➔ Engineering
Cold rolling applies stress to the sheet or bar metal in the form of compression.
2006-11-24 08:00:23 · answer #1 · answered by Michael K 3 · 0⤊ 0⤋
Cold rolling on a macroscopic scale "squeezes" the material to get the dimensions that you need. Cold rolling strain hardens (plastically deforms) the material which strengthens it in one direction. On a microscopic scale, it forms lots of dislocations in the grains of the material. As such, the material becomes more chemically reactive at grain boundaries.
Material changes:
Material becomes harder and also has increased wear resistance. Electrical resistance also increases. Lower corrosion resistance.
In the study of manufacturing, cold rolling avoids the problem of having oxides on the material when hot rolling and does away with the need of a environment. Cold rolling also gives good dimensional tolerance.
2006-11-26 07:25:04 · answer #2 · answered by Kharsp 1 · 0⤊ 0⤋
increased strength and hardness, reduction in ductility. original prpperties can be restored by heating above the recrystallization temperature.
2006-11-24 19:31:28 · answer #3 · answered by MrWiz 4 · 0⤊ 0⤋
increased hardness
2006-11-24 19:22:09 · answer #4 · answered by Nick F 6 · 0⤊ 0⤋
http://www.efunda.com/processes/metal_processing/cold_rolling.cfm
2006-11-24 16:39:57 · answer #5 · answered by sore_l3ellend 2 · 0⤊ 0⤋