The Study of Proper Conditions in Face Milling Palmyra Palm Wood and Coconut Wood Using Design of Experiment

Abstract

The purpose of this research was to investigate the effects of main factors on the surface roughness in face milling process palmyra palm wood and coconut wood by computer numerical controlled milling machine and using shell end mill cutting tools 6 edges. The main factors including speed, feed rate, depth of cut and angle of cut were investigated for the optimum surface roughness. The result of preliminary trial showed that the depth of cut and the angle of the cut had no effect on surface roughness. It was found from the experiment that the factors affecting surface roughness were feed and speed, with tendency for reduction of roughness value at a lower feed rate and greater cutting speed. Therefore, in the facing process for palmyra palm wood it was possible to determine a face milling condition by means of the equation Ra = 0.954 + 20.4 Feed + 0.00126 Speed. This equation was employed at a limited speed of 800-1200 rpm, and the feed rate of 0.03-0.05 mm/tooth. The result from the experiment of the mean absolute percentage error of the equation of surface roughness is 6.10% which is less than the margin of error, and is acceptable. For coconut wood it was found from the experiment that the factor affecting surface roughness was feed rate and cutting speed, with tendency for reduction of roughness value at lower feed rate and greater cutting speed. Therefore, in the face milling coconut wood it was possible determine a facing condition by means of the equation Ra = 4.72 - 0.000864 Speed + 0.00443 Feed. Leading this equation goes to use is in limitation cutting speed 1000-2000 rpm at feed rate 100-300 mm/min. The result from the experiment of mean absolute percentage error of the equation of surface roughness is 4.64% which is less than the margin of error, and is acceptable. As a result, the selection of optimal machining parameters can be greatly benefited to the Coconut wood furniture manufacturing industry in terms of productivity improvement.

Surface roughness of thermally treated wood cut with different parameters in CNC router machine

“…In a previous study, the feed rate was defined as the time the material was subjected to the cutting process, and it was stated that a decrease in the feed rate means that a point on the material is in contact with the end mill tool for a longer time (Pelit and Yaman 2020). It has also been reported in previous studies that the surface roughness values of wood or wood-based materials machined with a CNC router machine increase due to increasing feed rate, and the surface quality decreases (Mitchell and Lemaster 2002;Iskra and Tanaka 2005;Davim et al 2009;Karagöz 2010;Rawangwong et al 2011;Kaya et al 2017).…”

“…It has been reported that high spindle speed and low feed rate decrease the surface roughness of wood in pocket machining with a CNC router machine, and therefore the spindle speed and feed rate considerably affect the surface quality (Davim et al 2009;Karagöz 2011). In previous studies in which surface roughness was determined after processing different materials (wood, wood-based, or composite) with a CNC router machine, increases in the spindle speed reduced the roughness of the machined surface and increased the surface quality (Rawangwong et al 2011;Aghakhani et al 2013;Sütçü and Karagöz 2013;Patel and Patni 2014;Kaya et al 2017).…”

The Influence of Cutting Parameters of Turning Process on the Oil Palm Wood Using Carbide Tool

“…Differences also exist when these materials are compared to solid wood. A better understanding of the necessary process parameters to cut these materials will lead to the improved results with respect to tool wear and surface roughness [2][3][4][5][6][7][8]. Researchers have attempted to gain more understanding in wood machining process.…”