This paper describes the development of a flatness inspection system, integrated in the control process of a hot strip mill in the steel industry. The objective of the system is to calculate flatness indexes for every strip, comparing the length of its lateral profiles with the central length. The reconstruction of the profiles is based on a nonlinear triangulation technique. Images of the steel strip, at high temperature and high speed, are sampled every 2 ms at five different points and are processed on-line in order to calculate height displacement values of the strip, which allows the calculation of final flatness indexes for the steel strip. The measurement method developed introduces an innovative geometry in the disposition of the optical elements which increases the measurement range without reducing precision. It also includes a tracking system to compensate for the effects of lateral displacements of the strip. The flatness inspection system has been implemented using a heterogeneous distributed computer system.
[1]
D.F. Garcia,et al.
Real-time flatness sensor based on a linear-vision multiprocessor system (RV-05)
,
1994,
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.
[2]
Francisco J. Suárez,et al.
Flatness defects detection in rolling products with real-time vision system
,
1994
.
[3]
B. J. Aalderink,et al.
Watch your shape! Shape measurement and closed loop control in a hot strip mill
,
1987
.
[4]
D.F. Garcia,et al.
Flatness defect measurement system for steel industry on a real-time linear-image processor
,
1993,
Proceedings of IEEE Systems Man and Cybernetics Conference - SMC.