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Mills

Source: | Updated: Dec 07, 2016

rolling mill, also known as a reduction mill or mill, has a common construction independent of the specific type of rolling being performed:

· Work rolls

· Backup rolls - are intended to provide rigid support required by the working rolls to prevent bending under the rolling load

· Rolling balance system - to ensure that the upper work and back up rolls are maintain in proper position relative to lower rolls

· Roll changing devices - use of an overhead crane and a unit designed to attach to the neck of the roll to be removed from or inserted into the mill.

· Mill protection devices - to ensure that forces applied to the backup roll chocks are not of such a magnitude to fracture the roll necks or damage the mill housing

· Roll cooling and lubrication systems

· Pinions - gears to divide power between the two spindles, rotating them at the same speed but in different directions

· Gearing - to establish desired rolling speed     “mills”

· Drive motors - rolling narrow foil product to thousands of horsepower

· Electrical controls - constant and variable voltages applied to the motors

· Coilers and uncoilers - to unroll and roll up coils of metal

Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill. The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators. Billets, for re-rolling, are subsequently rolled in either a merchant, bar or rod mill. Merchant or bar mills produce a variety of shaped products such as angles, channels, beams, rounds (long or coiled) and hexagons.


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