Design Improvement At Shearing And Tandem Cold Milling Process Of Full Hard 0,2 X 914 Mm Products In Steel Manufacturing With Six Sigma Method

. This research aims to address the problems that are facing a largest steel manufacturing in Indonesia in producing steel is production failure that is caused by process so that it produces defect. The steel manufacturing produces 3 types of products, the named are Hot Rolled Plate, As Rolled and Full Hard. For Full Hard products there are 3 types of popular sizes that are often produced, the sizes are 0.2 x 914 mm, 0.25 x 914 mm and 0.7 x 1219 mm. When compared to the two popular sizes, Full Hard 0.2 x 914 mm products have the highest number of defective products. The percentage of these non-achievements is indicated by defects as in the year 2018 of January until December occurred a defective average of 16% or 1,617 tons This research will focus on improving the Shearing process and the Tandem Cold Mill that causes Saw Tooth Edge, Pick Up and Friction Pick Up defects. This research is done by using Six Sigma methodology (DMAIC) is used to minimize the occurrence of problems in the Shearing process and the Tandem Cold Mill. To find out the cause of a defect in a problematic process, an analysis using fishbone diagrams and 5 why’s, then determines the defect repair priority using FMEA.