variavel0=<b>João Roberto Ferreira</b> - jorofe@iem.efei.br Escola Federal de Engenharia de Itajubá
<b>Paulo Fernandes Silva</b> - psilva@iem.efei.br Escola Federal de Engenharia de Itajubá
<b>Luis Carlos Mendes Silva Junior</b> - psilva@iem.efei.br Escola Federal de Engenharia de Itajubá
<b>João Sílvio Semolini Olim</b> - psilva@iem.efei.br Escola Federal de Engenharia de Itajubá
<b>Abstract.</b> A growing application of carbon fiber reinforced carbon composite materials (CFRC), also known as composite carbon-carbon (C/C), is taking place, mainly in the aerospace industry, aeronautics, automotive and in the area of biomedicine. This is due to the excellent properties of these materials, such as high resistance to abrasion and thermal shock, good mechanical resistance to high temperatures (T>2000ºC), low density, high thermal and electric conductivity, high rigidity and chemical inertia in controlled atmosphere. A paucity of information remains, relative to the production process, because the component parts of this material require a final machining finish, since its non conformity may lead to serious damages as related to the high aggregated value of the product. Due to its heterogeneous structure and anisotropy, this material is of difficult machining, because it presents high abrasion and machining cutting efforts, these factors being extremely noxious to the useful life of the cutting tool. Another aggravating factor during the machining of this material is the formation of powdered chips, highly noxious to the operator and the machine tool. The objective of this work is to present some machining parameters, such as the temperature behavior of the tool cutting edge during the turning of the composite C/C. For a specifies cemented carbide tool, it will be verified the influences of the cutting speed in the cutting temperature and in the process of oxidation of the composite, since this oxidation occurs at temperatures higher than 370ºC, and this brings up some contradictory results with respect to the tool life and the fundamentals of the machining process. For evaluating the cutting temperature of the tool cutting edge a temperature measurement system was used to measure the temperatures in other points of the tool and a computational program to simulate numerically the distribution of temperatures in the tool rake face, by applying the finite differences method. The results confirm the distinct behavior of the CFRC composites machining relative to the metals. However, the obtained values of cutting temperature show that the process of oxidation of the piece does not happen, and such behavior is then attributed to the wear mechanism of the process.
<b>Keywords.</b> Turning process, Carbon-carbon composite, Cutting Temperature distribution.