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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2012.tde-19072013-145804
Document
Author
Full name
Marcelo Otávio dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Batalha, Gilmar Ferreira (President)
Bordinassi, Éd Claudio
Stipkovic Filho, Marco
Title in Portuguese
Estudo da formação da rebarba no fresamento de faceamento de ferro fundido vermicular utilizado em blocos de motores diesel.
Keywords in Portuguese
Ferro fundido vermicular
Fresamento de faceamento
Parâmetros de corte
Planejamento fatorial completo
Rebarba
Abstract in Portuguese
Visto o alto custo gasto nas linhas de usinagem com processos de rebarbação e a crescente demanda na utilização do ferro fundido vermicular, principalmente em motores diesel, este trabalho visou investigar as rebarbas formadas no fresamento de faceamento em uma face similar à face de fogo de um bloco de motor de ferro fundido vermicular FV450. Foram utilizados insertos de metal duro em fresas de facear com 100 mm de diâmetro. Os ensaios foram divididos em duas etapas. Na primeira etapa foi estudada a influência da geometria da ferramenta e a formação da rebarba remanescente. Na segunda etapa foram aplicados os melhores resultados obtidos durante os ensaios da primeira etapa. Um planejamento fatorial completo foi utilizado para a determinação da quantidade de ensaios desta etapa, variando-se a velocidade de corte, o avanço, a profundidade de corte e o desgaste de flanco. A medição da rebarba foi realizada em duas posições diferentes na borda da peça em questão, gerando assim dois ângulos diferentes de saída da ferramenta da peça. Verificou-se que a altura da rebarba foi menor quando se utilizou insertos de geometria mais positiva. O desgaste e o ângulo de saída da peça interferiram de forma significativa no tamanho da rebarba. Também verificou-se a redução da rebarba com o aumento do avanço e da velocidade de corte e com a diminuição da profundidade de corte. Através do software STATISTICA 8.0 foram obtidos os valores dos efeitos principais e das interações, juntamente com o intervalo de confiança e erro padrão. Por fim o planejamento adotado permitiu a elaboração de um modelo empírico capaz de predizer a altura da rebarba.
Title in English
Study of burr formation after face milling of CGI used in engine blocks.
Keywords in English
Burr
Compacted graphite iron
Complete factorial planning
Cutting parameters
Face milling
Abstract in English
Since the high cost spent on machining lines with deburring processes and the growing demand in the use of Compacted Graphite Iron (CGI), especially in diesel engines, this work aims to investigate the burr formation mechanisms during face milling of CGI FV450, in a face similar to the combustion face of an engine cylinder block. Carbide inserts were used in a 100 mm of diameter milling cutter. The tests were divided into two stages. In the first stage the following variables were studied: tool geometry and milling with remaining burrs from previous milling. In the second stage, were applied the best results obtained during the tests of the first stage. A Complete Factorial Planning was used to specify the amount of experiments, varying cutting speed, feed rate, cutting depth and the flank wear. The burrs measurement was performed in two different positions of the workpiece exit border, generating two different exit angle from the workpiece. It was found that the burr height was lower with more positive geometry. The wear of the tool and exit angle from the workpiece interfered significantly the burr height. It was observed the decrease of the burr height with the increase of the feed rate and cutting speed and with the decrease of the cutting depth. Through the software STATISTICA 8.0 values were obtained for main effects and interactions, along with confidence intervals and standard error. Finally, the plan adopted allowed the development of an empirical model capable of predicting the burr height.
 
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Publishing Date
2013-07-31
 
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