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Optimization of Process Parameters During End Milling and Prediction of Work Piece Temperature Rise

Bhirud N. L., Gawande R. R.

Archive of Mechanical Engineering

2017

Vol. LXIV, nr 3

327--346

During the machining processes, heat gets generated as a result of plastic deformation of metal and friction along the tool–chip and tool–work piece interface. In materials having high thermal conductivity, like aluminium alloys, large amount of this heat is absorbed by the work piece. This results in the rise in the temperature of the work piece, which may lead to dimensional inaccuracies, surface damage and deformation. So, it is needed to control rise in the temperature of the work piece. This paper focuses on the measurement, analysis and prediction of work piece temperature rise during the dry end milling operation of Al 6063. The control factors used for experimentation were number of flutes, spindle speed, depth of cut and feed rate. The Taguchi method was employed for the planning of experimentation and L18 orthogonal array was selected. The temperature rise of the work piece was measured with the help of K-type thermocouple embedded in the work piece. Signal to noise (S/N) ratio analysis was carried out using the lower-the-better quality characteristics. Depth of cut was identified as the most significant factor affecting the work piece temperature rise, followed by spindle speed. Analysis of variance (ANOVA) was employed to find out the significant parameters affecting the work piece temperature rise. ANOVA results were found to be in line with the S/N ratio analysis. Regression analysis was used for developing empirical equation of temperature rise. The temperature rise of the work piece was calculated using the regression equation and was found to be in good agreement with the measured values. Finally, confirmation tests were carried out to verify the results obtained. From the confirmation test it was found that the Taguchi method is an effective method to determine optimised parameters for minimization of work piece temperature.

Badania wybranych właściwości warstwy wierzchniej elementów ze stali C45 po cięciu laserem, frezowaniu wykończeniowym oraz nagniataniu odśrodkowym

Skoczylas A., Zaleski K.

Mechanik

2016

R. 89, nr 8-9

1088--1089

Przedstawiono wyniki badań chropowatości powierzchni oraz mikrotwardości warstwy wierzchniej elementów ze stali C45 po cięciu laserem, a następnie poddanej obróbce frezowaniem wykończeniowym oraz nagniataniem odśrodkowym. Celem frezowania było usunięcie prążków po cięciu laserem, natomiast nagniatanie umożliwiło umocnienie warstwy wierzchniej oraz zmniejszenie chropowatości powierzchni.

The article presents the results of surface roughness and microhardeness surface layer of C45 steel objects after laser cutting and then treated by finishing milling and centrifugal burnishing. The aim of the milling was to remove “striae” after laser cutting, while centrifugal burnishing allows to strengthen the surface layer and improve surface roughness.