Manufacturer of Cold Mill: Ishikawajima Heavy
The purpose of the reversing cold rolling mill is to reduce the thickness of
the steel to the customer’s specifications. The hot roll band passes back and
forth between the rolls until it reaches the specified thickness. Like the
pickle line, the cold rolling mill is able to handle two coils at a time. One
coil lies in wait while the other is being processed.
The reversing cold rolling mill is so named because the steel runs back and
forth between the rollers, reducing the thickness further with each pass.
Steelscape’s reversing cold rolling mill employs closed-loop computerized
quality control gauges, a unique feature for reversing mills. These gauges
ensure close tolerances for thickness and shape, which enables Steelscape to
offer cold-rolled steel equivalent to any other U.S. producer.
- A coil fresh from the pickle line sits in waiting for the cold rolling
- The coil being processed starts at the entry tension reel, where it is
uncoiled and passed forward through the rollers.
- A set of rolls applies pressure to the steel in order to make it thinner,
while maintaining its shape and width. The number of passes depends on the
customer’s specifications for coated product thickness.
- As it passes forward through the rolls, the steel is re-coiled onto the
delivery tension reel. From there it goes back through the rolls in reverse,
reducing the steel thickness further.
- Thickness gauges measure the thickness of the steel with each pass through
- Once the proper thickness is achieved, the steel is again coiled onto one of
the tension reels. From there it is ready to enter the metallic coating