Abstract
Material tracking is an important part of the automation control system which has a major impact on the product quality. This paper addresses a stand load identification in wire rod mill as a new algorithm added to existing control system. Tension control approaches are described and a modification of existing tracking system is proposed in order to eliminate tracking faults. Proposed method is based on dynamic torque calculation and its performance was experimentally verified on the industrial wire rod mill. Experimental results show significant reduction of the errors.
Highlights
Wire Rod Mill (WRM) usually consists of roughing, intermediate and finishing mill
The algorithm of Dynamic Torque Adaptation (DTA) was implemented into existing control system based on Siemens S7 400 Programmable Logic Controller (PLC)
The blue lines are the actual torque values Tfbk of individual stands (STD03 STD04 - STD05 - STD06) and the red lines are the values of total filtered load torque Tload obtained by DTA algorithm
Summary
Wire Rod Mill (WRM) usually consists of roughing, intermediate and finishing mill. Each mill consists of several Stands (STD) [1] and [2] and each stand is driven individually by electrical motors supplied from power converters. To maintain a stable and high quality rolling process, it is required to control the speed of the stands according to the tension conditions between the stands. Feedback Torque Load Detection means loopering of the material between the stands, that leads to cobble in the mill [6] All these deviations have a big impact on product quality. If the mill speed is increased rapidly, motor torque increases and, under certain conditions, it can exceed LD signal level Additive torque components Tr, Tp, Tft and Tbt act on the motor shaft These components are closely related and depend on many rolling parameters and rolling and tension forces, which influence the stand. That the value of T0 in Eq (7) is neglected, but it has to be identified for the calculation of inertia
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