1. Cylinders and tools

1.1 Cylinders

The choice of cylinder must meet the following requirements:

• sufficient tensile strength to withstand rolling forces;

• sufficient surface finish retention;

• the greatest possible wear resistance, with the constraint that the cylinder must be able to be re-machined.

In simple terms, steel, which is stronger than cast iron, is used for large trains or high-pressure roughing cages.

The more fragile but wear-resistant cast iron is used for intermediate trains and finishing cages.

Where possible, GS (spheroidal graphite) cast iron is used in roughing machines because it is more...