Luther Holton Associates Inc
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Adaptive Online Setup Models

LHA has supplied Adaptive Roughing Mill and Finishing Mill models and is prepared to offer Coiling Temperature Control. Short and long term adaption strategies are used in conjunction with physically based model equations and adapters. Adapters are maintained by grade, grade family, and thickness or temperature. Standard practice tables are used to maintain operating mode selections, load distributions, spray practices, etc.

All three models can run in four modes:


Normal Operation


Setup and adaption are run, but references are not used


Setup and adaption are run on records of stored rolling data


For testing and what-if analysis

Simpler off-line model calculators (RMCALCS AND FMCALCS) are also available for RM, FM and Plate Mill applications in a Windows environment.


Roughing Mill Model

The RM model features fully adaptive RM and Edger Setup calculations, with setup calculations re-calculated after each pass or stand. Mill limit checks automatically shift loads between passes/stands, or in extreme cases increase the number of passes and/or the transfer bar thickness.

Finishing Mill Model

The FM model supports both coil box and conventional operation. References are provided to FM gaps, stand speeds, acceleration (zoom), side guides, roll bending (and other profile actuators), X-ray gauge, width gauge, stand speed control (impact droop), looper control (angle, tension and cross-sectional area) and AGC (mill modulus, strip stiffness, product dependent gains, head and tail offsets, inter-stand strip thicknesses and roll forces).

Coiling Temperature Control

The CTC model uses material dependent cooling efficiency factors as a function of strip temperature, including emissivity, thermal conductivity, specific heat and density (thermal diffusivity). Cooling efficiency is calculated as a function of cooling water temperature, and modified for strip width. Adaption of individual spray efficiencies results in automatic detection of faulty spray headers.