How pass line is calculated in hot rolling mill?

Answer 1

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

• * Limit separating force

• * Limit rolling torque

• * Bite angle

• * Flatness limits

• * Metallurgical limits
• * Specific limits(length of delay table, etc.)

If all constrains are fulfilled and rolling schedule gives maximum productivity (minimum production time) and the desired product and its specifications are obtained, we can speak about optimum rolling schedule.

Answer 2

The pass line is a line that runs parallel through the roll partings and passes through the centre of the stock area of each pass at every stand. This line starts through the centre of the billet standing on the furnace exit rollrs and runs parallel through each stand through a centre line of the shear blades of the dividing shear prior to the cooling bed. All guiding equipment is aligned to the pass line.