ROLLING OF METALS
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Rolling – reducing the thickness or changing
the cross-section of a long workpiece by compressive forces applied through a
set of rolls
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Developed in late 1500s
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Accounts for 90% of all metals produced by
metal working processes
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Often carried out at elevated temperatures
first (hot rolling) to change coarse-grained, brittle, and porous ingot
structures to wrought structures with finer grain sizes and enhanced properties.
Hot rolling
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The
initial breakdown of ingots into blooms and billets is generally done by
hot-rolling. This is followed by further hot rolling into plate, sheet, rod,
bar, pipe, rail
Cold rolling
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The
cold-rolling of metals has played a major role in industry by providing sheet,
strip, foil with good surface finishes and increased mechanical strength with
close control of product dimensions.
Typical Arrangement of
Rollers for Rolling Mills:
Shaped Rolling or Section
Rolling:
•
A
variety of sections can be produced by roll forming process using a series of
forming rollers in a continuous method to roll the metal sheet to a specific
shape
Applications:
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construction
materials,
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partition beam
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ceiling
panel
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roofing
panels.
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steel
pipe
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automotive
parts
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household appliances
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metal
furniture,
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door
and window frames
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other metal products.
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