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Indigenization, inauguration of sheet width measurement systems at Tin-Plated Unit


The head of the Tin-Plated Plant and the Cold-Rolling Unit’s Cutting Lines No. 1 and 2 at Mobarakeh Steel Company has announced that the project to indigenize, install and inaugurate width measurement systems for sheets at the Tin-Plated Plant has been implemented successfully.   
Mostafa Naji further said thanks to endeavors by a technical team of electricity and automation experts at the Tin-Plated Plant, experts with MSC’s Indigenization Units and the University of Isfahan, implementation of the width measurement project was successful, adding the inauguration of the newly installed systems will help take instant measurement of sheet widths at two points, and fully control any inconsistency in the width of the produced items.
The width measurement system is a key device in adjusting the tolerance of the products’ width to standards and customer demands, he said, adding since the process needs precision and high speed, there should be special sensitive equipment. “In light of the nature of the tin-plated line and the need for controlling the width of sheets after they come out of the side trimmer and tension leveler, two width measurement devices which match up to the required standards were developed and constructed by MSC experts in cooperation with the University of Isfahan. One device was then installed next to the side trimmer and the other next to the tension leveler.”
As for the reasons behind the implementation of this project, he said in the initial designing of the tin-plated line, the width of the sheets was measured by an exterior device only at one point during the process (after going through the side trimmer). “In that process, there was measurement error with no high degree of precision because the light source was located below the sheets, there were vibrations and waves on the surface of the sheets, and the sheets were affected by the surrounding lights, especially at night. In addition, the collision between the sheets and the light source which was lying beneath the sheets would cause repeated breakdowns in that part, something which would in turn raise the man-hours put into repair work and sometimes long delays in the operations.”
Naji underlined that the device was totally phased out because of the defects in designing, the oldness of the parts of the device and the related software, the high price of spare parts and lack of effective support by the producer. “Since the absence of this device in the production process would be clearly felt, the Unit’s personnel decided to implement this project to remove the existing problems. Following the review of the problems associated with the previous system, analysis of the breakdowns, and similar experience in the Cold-Rolling Unit, we decided to indigenize the device. Thanks to the endeavors of the personnel, the device was designed and installed in less than six months.” 
As for the upsides of the project, he said the laser-based light source together with cameras was installed on the upper side of the sheets. “With the light shining over the roller, the measurement error stemming from vibrations and waves on the sheet surface and the effect of the surrounding lights was completely removed. The outgoing signal was improved before being sent to PLC. The signal is used to measure the width of the sheets and the deviation of the passing sheets from the center. It can also detect ruptures in sheets.”            
He explained that the new system simplifies the control network, easily provides the spare parts, removes the defects quickly, and has higher precision and fewer defects, adding it carries a low price tag compared with its foreign peers and does not need constant calibration. He said easy settings and speedy launch are among other upsides of the new system. 
In conclusion, he praised the managers of the Cold-Rolled Unit and coated products, the management and experts of the Indigenization Unit, the Technical Offices of Production, Repairs, and Spare Parts at the Cold-Rolled Unit for their support, and especially the personnel at the Unit’s Electrical Repairs and Automation who contributed to the implementation of this project.


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