Desenvolvimento de uma formulação de material de atrito utilizando a metodologia de delineamento de experimentos de misturas

Abstract

Friction materials are fundamental components in vehicle motion control and therefore have extremely complex technical requirements. Currently it is not enough to develop a product that has friction coefficient stability, requirements of high durability, low noise levels, absence of smoke and bleaching are common features in new designs. Additionally, restrictions on the use of raw materials - such as asbestos, lead, and copper seek to reduce the environmental impact of friction material. This series of technical requirements and product restrictions has increased the product development cycle. What was accomplished in six month periods of work, currently reach three years of work. In order to try to reduce development time, this work brings an approach in the process of selection of raw materials. , combining the practices of the design of mixture experiments with the tests in dynamometer, analyzing the results of friction and wear. The first part of this work included the selection of raw materials in three groups of materials that make up a friction material - loads, abrasives and lubricants. Through simple substitution in a basic formulation it was possible to determine which were the most promising raw materials for the second phase of the work. In the second part of the work, the mixture experiment delineation tool was used to determine the best relationship of these three components in a real formulation of friction material evaluating the braking efficiency results and the body wear and counterbalance obtained by the dynamometer tests.[resumo fornecido pelo autor]