Effects of cutting parameters on surface roughness and hardness in milling of AISI 304 steel

Abstract

This paper presents an experimental study in dry milling of austenitic AISI 304 stainless steel with hard alloy milling cutters, related to the influence of feed rate and cutting speed on surface roughness and hardness. The results show that machining caused a decrease in hardness of the workpiece with respect to the initial hardness, however, the feed rate and the cutting speed did not show any statistically significant effects on the established level of confidence. The lower surface roughness values were obtained for higher cutting speeds and for smaller feed rates, being the cutting speed the factor of greater contribution. The multiple regression model was computed and the requirements were tested to state that the variables are correlated. Finally, the most appropriate cutting parameters were determined using the contour plot.Keywords: surface roughness; hardness; milling; AISI 304 steel; analysis of variance and regression.Efectos de los parámetros de corte en la rugosidad superficial y la dureza en el fresado del acero AISI 304Resumen Este trabajo presenta un estudio experimental, en el fresado en seco del acero inoxidable austenítico AISI 304 con fresas de aleación dura, relacionado con la influencia del avance y de la velocidad de corte sobre la rugosidad superficial y la dureza. Los resultados muestran que, el maquinado provocó una disminución de la dureza de la pieza con relación a la pieza inicial, no obstante, el avance y la velocidad de corte no representaron efectos estadísticamente significativos para el nivel de confianza establecido. Los menores valores de rugosidad superficial se obtuvieron para las mayores velocidades de corte y para los menores avances, siendo la velocidad de corte el factor de mayor contribución. El modelo de regresión múltiple fue calculado y se comprobaron los requisitos para plantear que las variables están correlacionadas. Finalmente, se determinaron los parámetros de corte más adecuados utilizando el gráfico de contorno.Palabras clave: rugosidad superficial; dureza; fresado; acero AISI 304; análisis de varianza y regresión.

A Survey on the Effects of Cutting Parameters on Surface Roughness When Milling 40Cr Steel Using End Mill Cutter

“…Hasan Gökkaya [1] studied on milling the alloy AA2014. Luis Wilfredo Hernández-González et al [2] conducted a milling of AISI 304 steel. Okokpujie Imhade et al [3] tested 6061 aluminum alloy milling under the condition of Minimum Quantity Lubrication (MQL).…”

Optimization of Cutting Parameters for Milling Process of (4032) Al-Alloy using Taguchi-Based Grey Relational Analysis

“…There are three main parameters (spindle speed, feed rate, and cut depth) found in any type of milling machine, as well as other parameters that influence the milling process such as (cutting tool and workpiece material), which can give the designer and worker (operator) flexibility to change, select, and control between them to achieve high quality, maximum productivity, and practical properties of the milling process [2][3][4][5][6][7][8].…”

“…In recent years, the Computer Numerical Control (CNC) system has been used to convert a manual milling machine into a full automation machine (CNC milling machine), which can control the movement of end mill cutter using coded (G and M) instructions processed by a computer and the capability to perform repeat tasks with high accuracy [2][3][4][5][6][7][8].…”

Influence of Cutting Parameters on Surface Roughness during Milling AISI 1045 Steel

“…These conclusions are consistent with those presented in [3][4][5][6][7][8]. On the contrary, Hernandez.G et al [9] said that cutting speed has the strongest influence on the surface roughness than other when carrying out the milling process of AISI 304 steel. However, the authors [10] showed that cutting speed, feed rate, and depth of cut have no influences on the Rz instead of Ra (average surface roughness) for both case of milled materials, i.e.…”