METAL STOCK
METAL STOCK
Can you help with the question about cold rolling metal bar stock?
I'm interested in something about rolling metal. If you have a roller that say has 10 tons of pressure, do you get the same "flattening effect" from having the weight on one roller as having the same weight or force spread over two rollers of the same diameter. If there is an advantage to the two roller method, is there a math formula that shows the relationship between one roller vs. two rollers given the same weight?
The key in cold rolling is exerting a pressure large enough that the metal goes beyond the range of ellastic deformation and is in te range of plastic deformation. If the 10 tons of force (not pressure) are distriburef between two rollers, the pressure goes down by a factor of 2 and the deformation may be an elastic deformation; after the metal gets out of the roller, it recovers its original shape.
Rolling is usualy done in multiple steps, heating the metal every few rolls, to avoid deformations of the crystalline lattice which would make the metal brittle; the exact force is a matter of metalurgical engineering. But the multistep approach does not say anything about the type of comparisonyou talk about.
The general dynamics of deformations is presented at http://en.wikipedia.org/wiki/Deformation
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