SILPAKORN UNIVERSITY SCIENCE AND TECHNOLOGY JOURNAL, Vol 5 (No 2) Special issue from OR-Net 2011 Conference

A Study of Proper Conditions in Face Milling Palmyra Palm Wood by Computer Numerical Controlled Milling Machine

Surasit Rawangwong, Jaknarin Chatthong, Julaluk Rodjananugoon, Worapong Boonchouytan

Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkhla

Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkhla

Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkhla

Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkhla


Abstract


The purpose of this research was to investigate the effects of main factors on the surface roughness in milling process of Palmyra Palm wood face 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. Generally, acceptable surface roughness was between 3.0-9.0 ┬Ám before sanding process. In the experiment, Palmyra Palm wood of 11-13% humidity was used at 800-1200 rpm in cutting speed and feed rate at 0.03-0.05 mm/tooth. 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.

Keywords: Design of Experiment; Computer Numerical Controlled Milling Machine; Palmyra Palm Wood; Surface Roughness

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