Estudo estatístico de determinação de capabilidade de produtividade estratificada em mix da linha de decapagem e laminador contínuo à frio acoplado e recozimento contínuo da planta de Ipatinga laminação de tiras a frio 02 (LTF02)

Abstract

The final product of analyzed process are the flat steel coils, and the productivity targets are determined taking into account the size and quality of the products generated in the integrated rolling mill (LTF2), cold rolling strip mill 2 of facilitie. Therefore, it is necessary statistically know whether the current processes have performance capable of meeting these goals. Currently the productivity indices measure the performance of manufacturing processes and indicate that they are working within certain specifications. The adopted procedure to determine productivity goals associates average of the last previous year as the starting value of the next cycle and the average of the three best results of the previous period as expected value at the end of the next cycle of production/budget. The results show that current production bands classified within annealing cycles, product quality and size were well defined and there is no evidence of bands with large variation in productivity which proves an error in determining these ranges. Finally, the statistics analysis of process performance (Pp) executed provide information that the expected average percentage results outside the specification limits were 1.92% for PLTCM and 1.65% for CAPL, which validates the method for preparing the current goals of productivity, resulting in achievable but challenging targets.