ABSTRACT

Steel strips suffer from lateral shift when being rolled in a rolling mill, especially at the head and tail ends. That results in strip pinches with costly downtime and damage to the work rolls and the strip itself. The lateral shift can be reduced by levelling the gauge control cylinders in response to shift measurements and differential roll force measurements. Designing such controllers gave rise to the desire for analytical relations that describe the shifting process. Novel insights have been revealed, which include the differential material modulus, the differential mill modulus and the ratio to apportion the effect of levelling to entry and exit strip speed changes. The insights have resulted in compact analytical process models that have been used to implement strip tracking controllers safely and sensibly, and to schedule control gains based on actual process parameters. Focus has been on hot strip mills.

摘要

带钢在轧机中轧制时会发生横向移动，特别是在头端和尾端。这会导致带材挤压，造成代价高昂的停机时间，并损坏工作辊和带材本身。通过响应于位移测量和差动轧制力测量来调平厚度控制缸，可以减少横向位移。设计此类控制器引发了对描述换档过程的分析关系的需求。已经揭示了新的见解，其中包括差别材料模量、差别轧机模量以及分配整平效应对入口和出口带材速度变化的比率。这些见解产生了紧凑的分析过程模型，这些模型已用于安全、明智地实施带钢跟踪控制器，并根据实际过程参数安排控制增益。焦点一直集中在热带钢轧机上。