Rolling Pass Time Calculator

Estimate pass duration from coil geometry, reduction and a staged line-speed profile.

Primary operating parameters

Coil outer diameter (mm)

Strip width (mm)

Entry thickness (mm)

Target thickness (mm)

Top speed (m/min)

Acceleration / deceleration (m/s²)

Adjustment time at threading speed (s)

Coil change time (min)

Coil change time (sec)

Additional coil & speed settings

Coil inner diameter (mm)

Packing factor

Material density (kg/m³)

Threading speed (m/min)

Threading length (m, exit basis)

Slowdown stage 1 (m/min)

Length at stage 1 (m)

Slowdown stage 2 (m/min)

Tail run length at stage 2 (m)

Cycle utilization (OEE estimate)

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Green: rolling pass · Red: coil change

Calculated as rolling pass time ÷ (rolling pass + coil change). This is a simplified availability-based estimate, not full OEE: performance and quality losses are not modeled.

Exit strip speed vs. elapsed time

Thread / adjustAcceleration / bodyTwo-stage slowdown

Pass sequence

Phase	Duration	Distance (exit)	End speed	Elapsed

Model assumes constant strip width, volume conservation, uniform reduction, and constant acceleration/deceleration. All speed and travel distances refer to exit-strip speed. The adjustment delay is modeled at threading speed, so material continues to move. The two slowdown stages are speed thresholds: decelerate to stage 1 speed, travel the specified stage 1 length, then decelerate to stage 2 speed, followed by the specified tail run and final stop. Stage 2 is highlighted on the chart. Tail-out speed may be lower or higher than threading speed. Coil change time is included in production cycle time and t/h, but excluded from rolling pass time. No reversing, head/tail scrap or coil handling delay is included.