The Effect of Milling Parameters of Vanadis 4 Extra Steel on Cutting Force Values and Roughness of Machined Surface

Abstract

The article presents the results of experimental studies of the milling process of Vanadis 4 Extra - tool steel 1.2210 with a four-flute AlCrN-coated end mill. On the basis of the measured values of the total cutting force F and the roughness parameters Ra and Rz of machined surfaces, the relationships between specified cutting parameters and the analyzed roughness parameters were determined. Regression model of cutting force F was developed considering statistically significant cutting parameters. The developed model was validated using an additional set of recorded force values. Regression models were also created for the roughness parameters Ra and Rz of machined surfaces but they were found to be too inaccurate for the prediction of the aforementioned texture parameters. After analysis of the results obtained, it was found that the cutting speed vc had no effect on the value of the total cutting force F, while its influence on the roughness parameters was noticeable. It was also shown that, of the technological parameters ap, ae and fz within the assumed ranges of variation, the depth of cut ap, has the greatest effect on the cutting force F, the width of cut ae and the feed rate fz have a smaller effect. It was also shown that in the case of low cutting speeds vc the parameter Ra of the machined surface roughness strongly depends on the depth of cut ap and width of cut ae. At the same time it was noticed an increase in the Rz parameter with decreasing cutting speed vc. The remaining technological parameters, however, also significantly affect the obtained values of the Rz roughness parameter measured on the machined surface.

Keywords

• surface roughness
• milling
• cutting force
• vanadis 4 extra
• tool steel 1.2210