Time and Space Constrained Variable Gauge Control Model and Application

doi:10.12068/j.issn.1005-3026.2025.20230289

Abstract

Abstract:

During the rolling process of tailor rolled blank（TRB） cold-rolled strips， the gauge exhibits characteristics of periodic， continuous， and multi-stage variations. To address the difficulty in achieving precise gauge control， a control strategy of dense sampling and point by point regulation is proposed. To prevent oscillation in the control system， a variable gauge control（VGC） model based on time and space constraints is developed and successfully implemented in the control system of a variable gauge cold rolling mill. On-site data analysis shows that prior to the use of VGC model， the gauge fluctuations in the equal gauge zone are relatively stable， while the transitional zones exhibited significant gauge deviations， with positive deviations during upwards rolling and negative deviations during downwards rolling. After using VGC model， the system demonstrates rapid and effective adjustment capabilities for gauge deviations in the transitional zones， ensuring that the gauge deviations of TRB are within ±0.025 mm， better than the existing TRB standards in the automotive industry.

Key words: tailor rolled blank, variable gauge control, automatic gauge control, lightweight, cold rolling

CLC Number:

TG 335.5

Tao SUN, Liang-xin JI, Xian-li YANG, Xian-lei HU. Time and Space Constrained Variable Gauge Control Model and Application[J]. Journal of Northeastern University(Natural Science), 2025, 46(3): 46-51.

Figures/Tables 10

Fig. 1 Schematic diagram of single TRB and PLP strip

Fig. 2 Schematic diagram of PLP strip production mill

Fig. 3 VGC model with time and space constrains

Fig. 4 Smooth transition processing with arcs

Fig. 5 Smoothing of the start and end points of transition zones

Fig. 6 Time constraint in the VGC model

Fig. 7 Space constraint in the VGC model

Fig. 8 Thickness deviation of TRB products

Fig. 9 Thickness deviation for product A of TRB

Fig. 10 Comparison before and after VGC model control system usage

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