47. ROLLING AND BENDING
· The basic process is,
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1. We start with raw material in some form, typically there is one long dimension. The material may be hot or cold.
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2. The material is then fed in between rollers.
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3. The rollers apply a force to the material to thin or reshape the original cross section.
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4. The material emerges from the other side of the rollers in a new shape.
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5. The material may then be taken off, passed through another set of rollers, coated with oils, drawn, etc.
· There are two types of rolling,
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flat rolling - reduces the thickness of a sheet of material.
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shape rolling - produces new parts with a complex cross section.
· Materials that have been rolled typically have a wrought structure with the grains broken down.
· Rollers play a large part in continuous casting after the molten metal is poured off into a bloom, or some equivalent form.
