A new entry edge guide control system for cold mills was designed using a dual-mode control system. One control loop regulated the cylinder pressure to prevent machine damage due to pressure surge while the other loop provided edge guide position control. The target control level was ±1.59 mm accuracy for a maximum operating strip speed of 530 mpm with coil sidewall location variations of ±12.5 mm/sec. A mathematical model was developed to simulate the dynamic behavior of the control system using the state space design method. The control system features two PID controllers, two hydraulic proportional valves, and a digital edge sensor. The PID tuning constants and the hydraulic proportional valves were specified by simulation results considering system response and signal noise. Data from 35 coils was used to investigate control performance. The results show that the average standard error is entirely acceptable. The majority of the coils are expected to have tracking errors less than the required accuracy.

Baring, J. A., 1953, “Control of Moving Webs,” Machine Design.
Shelton, J. J., 1968, “Lateral Dynamics of a Moving Web,” Doctoral Thesis, Oklahoma State University, Stillwater, Okla.
Shelton, J. J., and Reid, K. N., 1971, “Lateral Dynamics of a Real Moving Web,” ASME Journal of Dynamic Systems, Measurement, and Control, pp. 180–186.
Feiertag, B. A., 1967, “Intermediate Guiding On Steel Strip Processing Lines,” Iron and Steel Engineer, pp. 147–154.
Feiertag, B. A., 1969, “New Technology Removes ‘Black Magic’ From Strip Guiding,” Proceedings of the National Coil Coaters Association.
J. J.
G. H.
, “
Strip Guiding—A Major Factor in Productivity
Iron Steel Engineer
, Vol.
, No.
, pp.
Seigler, W. R., 1990, “State-of-the-Art (Strip) Guiding Technology as Applied to Metal Process lines,” Finish-Fabrication Technology Seminar, Vol. II, San Antonio, Texas, The Aluminum Association.
Deering, J. M., 1965, “New Concepts for Automatic Strip Guiding for the Metals Industry,” Iron and Steel Engineer, pp. 109–115.
Markey, F. J., 1957, “Edge Position Control for the Steel Strip Industry,” Iron and Steel Engineer, pp. 119–128.
Guo, Remn-Min, 1991, “Evaluation of Dynamic Characteristics of HAGC System,” Iron and Steel Engineer, pp. 52–61.
This content is only available via PDF.
You do not currently have access to this content.