Análise das variáveis que possam interferir na medição do teste de resistência ao rolamento em um laboratório de ensaios de pneus automotivos

Abstract

The work presents an application of Lean Six Sigma tools and concepts to improve test results in a laboratory at a tire factory. The application is due to the increase in failure in the Rolling Resistance test and consequently the increase in the number of retests and the cost. The objective is to reduce the variables that interfere with the measurement and ensure the assertiveness of the results. To achieve this objective, the DMAIC (Define, Measure, Analyze, Improve and Control) methodology was applied, where it was possible to identify that excess material on the tread and crooked wheels were the two main causes of the increase in failure rates. As a result, improvements were proposed to reduce its impacts. As a result, the project achieved a 58% reduction in the number of failures, exceeding the initial expectation of a 50% reduction and thus reducing the number of retests and costs. Furthermore, with the more assertive results of the Rolling Resistance test, it is possible to evaluate other variables that have an impact, such as production variables and product design variables.