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OPP software

Optimum rolling schedule


Rolling schedule is the time sequence of passes of rolled piece through the mill respecting many constrains and limitations such as:

  • »Limit separating force,
  • »rolling torque,
  • »Bite angle,
  • »Flatness limits,
  • »Metallurgical limits,
  • »Specific limits (length of delay table, coiling thickness etc).

If all constrains are fulfilled, rolling schedule gives maximum productivity (minimum production time) and the strip/sheet is flat with required profile, we can speak about optimum rolling schedule.

The OPP serves for automatic calculation of optimum rolling schedules on reversing mills. It is based on optimization methods coupled with many other physical models. The OPP enables pass scheduling for strips/sheets made of various materials and rolled under various hot or cold conditions.

The pass schedule showed below is an example of hot rolling of AlMg3 alloy strip designed by the OPP.

An example of optimum rolling schedule in the space Force-Thickness

An example of optimum rolling schedule in the space Force-Thickness

The input parameters are dimensions and initial temperature of slab, material grade, target dimensions of the strip and target crown (profile).

Result of OPP calculation is optimum rolling schedule ensuring flatness, gives target crown, gives the shortest production time and respects all limiting mill criteria.

Crown (cross section) of the strip versus thickness

Crown (cross section) of the strip versus thickness

Separating force in passes

Separating force in passes