Avaliação da qualidade dimensional e geométrica de cilindros de blocos de compressores herméticos usinados pelo processo de brunimento flexível

• Ano de defesa: 2014
• Autor(a) principal: Fernandes, Karina Alves
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; BR; Programa de Pós-graduação em Engenharia Mecânica; Engenharias; UFU
• Palavras-chave em Português: Compressores herméticos; Brunimento convencional e flexível; Qualidade dimensional e geométrica; Incerteza de medição; Compressores; Mediçao; Hermetic compressors; Conventional and flexible honing; Dimensional and geometrical quality; Measurement uncertainty; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/14987; https://doi.org/10.14393/ufu.di.2014.475

The purpose of this work is to evaluate the geometrical and dimensional quality of block cylinders used in hermetic compressors machined by conventional and flexible honing. The conventional honing was done by EMBRACO, while the flexible honing was conducted at Federal University of Uberlândia using a CNC mill and a flexible honing which consists of a metal rod and nylon bristles with abrasive lobes at the ends. The evaluation of geometrical and dimensional quality was done by the measurement of: i) the cylinder diameter using a three coordinates measuring machine and a micrometer, ii) the circularity and cylindricity deviations using a shape deviation measuring machine and iii) the roughness (Ra, Rq, Rt, Rsk, Rku, Rk, Rpk e Rvk) using a electromechanical rugosimeter and a interferometer. For each measurand, it was estimated the related measurement uncertainty using the GUM methodology except for the roughness, where the Monte Carlo method was applied. The results showed that the flexible burnishing provides a significant improvement of the values of roughness parameters and the circularity deviation, while diameter values remained nearly constant. The flexible burnishing reduces the peak heights and eliminates the isolated occurrence of those without modify the valley depths, so providing improvements in proprieties such as surface softening, lubricant retention, mechanical strength and capacity to withstand loads in contact operations, meeting the desired tolerances.