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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16b
SUMMARY:Development of roll pick-up simulator in AHSS, UHSS strip annealing line
DESCRIPTION:In the Advanced and Ultra High-Strength Steel (AHSS, UHSS) strip annealing line, press flaws, called “Pick-up”, generated on the strip surface are sometimes caused by hard deposits on the surface of the furnace roll. If “Pick-up” occurs, strip line operation is interrupted for maintenance and an exchange of rolls. 
The investigation of the “Pick-up” mechanism and its suppression have been invented by using an experimental method in which the reaction of the steel surface-layered powder and the thermal spray layer were considered. However, in this experimental method, the contact state between rolls and steel strip was not reproduced. In the actual conditions, we assume that sliding contact is an important factor in the initial adhesion of pickup. We developed a simulator in which the contact state in the annealing line could be reproduced.
The simulator has a mechanism to rotate rolls, while pressing the roll against the steel, and slide horizontally at the same time. In this simulator, a new surface of the strip and rolls can be in contact continuously while reproducing the sliding contact. The atmosphere and temperature of the simulator can be reproduced under the conditions of the actual equipment. The contact pressure between the roll and the steel can be controlled based on the load cell measurement.
The test results from the simulator, showed that it was possible to reproduce the same adhesion form as the furnace roll deposit. In addition, it was confirmed that the time to initial adhesion differs depending on the steel grade and the conditions under which the film is changed. By using this simulator, we were able to select the optimum thermal spray layer and introduce it into the actual equipment, achieving an extension of the roll life by avoiding “Pick-ups”.

CLASS:PUBLIC
DTSTART:20230614T141000
DTEND:20230614T143000
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