THE EFFECT OF MACHINING CONDITION ON SURFACE ROUGHNESS OF METAL MATRIX COMPOSITE (MMC) AL-SI/10% ALN IN TWIST DRILL

Abstract

The Metal Matrix composite (MMC) are widely used in various industrial sectors such as transportation, domestic equipment, aerospace, military, construction, etc. The purpose of this experiment was to demonstrate the surface roughness by drilling the aluminum silicon alloy (Al-Si) matrix composite reinforcement with 10% of aluminum nitride (AIN) with three types of twist drill cutting tools. This experiment was conducted at various tools type, spindle speed and feed rate according to Taguchi Method. This method is using a Standard Orthogonal Array L9. The effects of tools type, spindle speed and feed rate on the surface roughness in drilling operation were evaluated using the Taguchi optimization methodology by utilizing the signal to noise (S/N) ratio. The parameters used in machining are the spindle speed, 1000 rpm, 1500 rpm and 2000 rpm, while for the types of tools used uncoated carbide, TiN and TiCN coated and the feed rate of this research made it 50 mm/tooth, 100 mm/tooth and 150 mm/tooth. The experiment data is collected and analyzed using Taguchi Method from MINITAB 16 software. The result is show the optimum parameters are (uncoated, 1500 rpm, 50 mm/tooth). The optimum parameter gained will help the automotive, military, aerospace industry has the competitive machining process from an economic perspective and manufacturing.