Micro downtimes management in the Lean perspective: An empirical research in a production bottleneck

Micro downtimes management in the Lean perspective: An empirical research in a production bottleneck 1. IntroductionThe National Tire Industry Association (ANIP) reported that tire sales in Brazil dropped by 8.2% in 2023 compared to the year before, with total sales falling from 56.64 million to 51.97 million units [1].According to [2], this decline may derive from factors such as high interest rates, economic instability, and shifts in the exchange rate, thus benefiting tire imports from China.Even in this scenario, specialists predict the market will rebound, hitting 2.09 billion USD by 2027, with an average Compound Annual Growth Rate (CAGR) of 4.5% per year between 2020 and 2027 [3].In this context of instability, companies must continually enhance their effectiveness to remain competitive.Lean manufacturing, Agile, and DMAIC principles were developed to identify and eliminate Nowadays, in the present dynamic industrial scenario characterized by shorter product lifecycles, customization, and uncertain demand, corporations should enhance their efficiency by reducing waste to remain competitive.This research addresses machine micro downtimes, which embrace a significant waste source that negatively affects Overall Equipment Effectiveness (OEE).Although the literature presents some studies suggesting methods to mitigate micro downtimes, contemporary approaches focus on isolated strategies, lacking an integrated methodology.Accordingly, a research gap remains in developing a comprehensive framework that holistically improves OEE and systematically decreases micro downtimes within processes with bottlenecks.In this context, the objective of this study is twofold.First, we aim to introduce a Lean-based framework to reduce micro downtimes in manufacturing processes.Second, we present the results of applying this framework in a Brazilian tire company through a practical research approach.The results demonstrate a 1.6% reduction in machine micro downtimes, amounting to potential savings of USD 750,000 annually.Additionally, the implementation led to the improvement project's completion three weeks ahead of schedule, showcasing the framework's effectiveness.Although validated in tire manufacturing, the adaptable framework shows potential for broader use in other industries, offering a flexible approach to enhancing efficiency and competitiveness.