MELHORAMENTO DO PROCESSO DE RETIFICAÇÃO DAS CABEÇAS DAS VÁLVULAS DE MOTORES DE COMBUSTÃO INTERNA ATRAVÉS DA ANÁLISE DOS ABRASIVOS: óxido de alumínio e carboneto de silício

Abstract

This work demonstrates the results of a comparison of the performance of grinding wheels, aluminum oxide and silicon carbide in the grinding of internal combustion engine valve heads. Such an approach is necessary due to the existing machining, with aluminum oxide grinding wheel, not to give ideal results to the process. The purpose of this study is to demonstrate which of the two types of grinding wheels has the best performance as a tool in the process, improving the surface finish of the faces (region to be machined) of the valve heads and providing better seating and sealing thereof. performance of these valves in the operation of the internal combustion engine. This objective will be achieved through a case study of the efficiency of the grinding wheels, where granulometry, structure, hardness, type of material and binder are analyzed. In addition to results obtained through a vacuum-making machine, which corroborate with the results achieved in the study of the efficiency of the grinding wheels. The study showed that the existing aluminum oxide grinding wheel is more efficient than the silicon carbide grinding wheel suggested for replacement due to its higher machining compatibility with chromium-nickel alloys. These are present in the constitution of the heads of valves of internal combustion engines. The study concludes that the adoption of aspects not addressed in this process, such as the presence of a cooling fluid in the rectification, if inserted through the research, may be relevant to the final results.