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Ceramica  2011 

Ceramicas avan?adas no processo de retifica??o cilíndrica externa de mergulho com rebolos diamantados com a técnica da mímima quantidade de lubrifica??o e refrigera??o otimizada

DOI: 10.1590/S0366-69132011000300003

Keywords: advanced ceramics, diamond wheels, external cylindrical grinding, mql, optimized cooling.

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Abstract:

ceramic materials have many advantages over other materials, including three main: capability of operating at high temperatures, high hardness and high wear resistance. for this reason they are able to be used in situations that require little wear, both at ambient temperature or at elevated temperatures. these properties have made the advanced ceramics an important part in industry applications in recent decades. however, the aggregated cost in the piece finishing is still very high. this finish is usually done by the grinding process, the only economically viable process that produces pieces with high surface quality and geometric precision. the companies are then looking for optimizing the grinding process exploring other forms of lubrication. thus, this project sought to explore the optimization of the method of lubrication in the cylindrical grinding with the technique of minimum quantity of lubrication (mql) and optimized cooling. three methods of cooling were used, the conventional, the mql and the optimized cooling, with three speeds of depth in each case. the output variables g ratio, roughness and circularity errors were analyzed. the analysis shows that the optimal cooling gives the best results, being a viable alternative to improve the process. the mql showed unsatisfactory results in comparison to the other two methods, but still acceptable in some cases of grinding process. considering the difficulty and high cost of disposal of cutting fluid due to the strict environmental laws, the mql comes as a strong trend in this type of process.

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