Title

SURPRISES ON SURFACE DEFECTS FROM HOT MILL TO GALVANIZING LINES

SURPRISES ON SURFACE DEFECTS FROM HOT MILL TO GALVANIZING LINES

Authorship

Jannasch, Elisa

Jannasch, Elisa

I am this author

DOI

10.5151/2594-5297-0042

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Abstract

Purpose: In order to optimize coil releasing and coil re-routing, it is necessary to analyze evolution of defects and their corresponding impact on downstream production processes. The Defect Tracking software implements the matching of selectable defects or regions with observations from downstream SIS. As a result of judging the downstream impact, coil release and rerouting decision rules can be optimized. Methodology: Classification must be accurate and reliable regarding the severity of defect grades. It enables comparing the defect grades starting at the hot mill over all subsequent processing lines.Furthermore, the 5i application displays, which defects disappear during the next processing steps – for example in the pickling or annealing process – by giving the exact number of defects. This additional knowledge helps to save costs for repairing processes, which might have been applied unnecessarily. Therefore, the difference in defect numbers can also depend on the analysis direction: with or against the material flow. Result: The application gives instant information on the defect’s occurrence including a filter possibility for the severity class. When tracking the coil to the pre-process SIS data, the application shows a coil map of the current process step next to the coil map of the same coil in pre-process in the same orientation. 5i matches selected defects by position calculation and geographical patterns and searches automatically for the best match in the selected defect subset. This software thus enables fundamental decision support based on coil defects and the setting of the accurate severity grade at each line.

Purpose: In order to optimize coil releasing and coil re-routing, it is necessary to analyze evolution of defects and their corresponding impact on downstream production processes. The Defect Tracking software implements the matching of selectable defects or regions with observations from downstream SIS. As a result of judging the downstream impact, coil release and rerouting decision rules can be optimized. Methodology: Classification must be accurate and reliable regarding the severity of defect grades. It enables comparing the defect grades starting at the hot mill over all subsequent processing lines.Furthermore, the 5i application displays, which defects disappear during the next processing steps – for example in the pickling or annealing process – by giving the exact number of defects. This additional knowledge helps to save costs for repairing processes, which might have been applied unnecessarily. Therefore, the difference in defect numbers can also depend on the analysis direction: with or against the material flow. Result: The application gives instant information on the defect’s occurrence including a filter possibility for the severity class. When tracking the coil to the pre-process SIS data, the application shows a coil map of the current process step next to the coil map of the same coil in pre-process in the same orientation. 5i matches selected defects by position calculation and geographical patterns and searches automatically for the best match in the selected defect subset. This software thus enables fundamental decision support based on coil defects and the setting of the accurate severity grade at each line.

Keywords

Software

Software