What is a rolling schedule about for cold rolling?

What is a rolling schedule about for cold rolling?

In a modern cold rolling mill system, a rolling schedule must be defined for each rolling job.

In this system, the rolling schedules are stored in the computer’s memory.

Each schedule is built on the following parameters:

• pass schedule (thicknesses)

• tensions for each pass

• speed for each pass

• other — for example, one or two motors per coiler

The rolling schedules are filed in the computer’s memory by:

• grade of material

• initial thickness

• final thickness

• width

To determine the required schedule, the operator displays the above data. A schedule code can also be used. At each pass, all the corresponding parameters are automatically known and used by the equipment.

The threading operation for the first and second passes is generally done manually, but the tendency today is to automate whenever possible. The mill and the strip being ready, the operator switches the system to automatic.

The inversion of rolling direction between two passes can be automatic. The operator can switch to manual at any time. For the system described above, some parameters have to be calculated experimentally (pass schedules), other partially through calculation (tensions). All the parameters, for each rolling schedule, have to be entered one-by-one into memory.