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Metal matrix composite (MMC) is a combination of two or more materials in a metal matrix, and is being widely used nowadays due to its excellent properties. This paper presents the surface integrity of LM6 aluminum MMC when machined with two different cutting tools; high speed steel (HSS) and uncoated carbide. The experiments were carried out with a constant cutting speed, feed rate and axial depth of cut, but differ in the radial depth of cut under dry cutting conditions. Results indicated that machining LM6 with uncoated carbide cutting tools provides a lower surface roughness and fine surface profile compared to HSS cutting tools, due to its edge stability. A lower radial depth of cut produced a fine surface finish and vice versa. Most of the machined surface was dominated by the feed mark effect due to path overlap from the cutting tool. This study is expected to provide a database of suitable cutting tools and cutting parameters for machining MMC based materials.

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When polyetheretherketone is used in structural applications it generally undergoes additional machining operations in order to form components. Machining PEEK can be a challenging task for manufacturers, however, especially when using a conventional cutting tool. This paper deals with the influence of a cutter's geometrical features when machining polyetheretherketones engineering plastic on their machining performances. Three categories of end mills were designed and fabricated with varying rake angles, clearance angles and helix angles to investigate effects on machining surface roughness and burr formation. From the investigations conducted, it is evident that end mill geometrical features (rake angle, clearance angle and helix angle) have significant effects on machining surface roughness and burr formation. Increasing the rake angle and helix angle value will improved the machining surface roughness, however, in the case of varying clearance angles, there are no significant results for the surface roughness produced. It could be observed, however, that a 12° clearance angle produced better surface roughness compared to other angles. The findings from the deliberately conducted experiments can be used for the development of high performance cutting tools, especially for machining polyetheretherketones engineering plastic material.

This paper investigates the effect of minimum quantity lubricant (MQL) on the surface roughness of titanium alloy Ti-6Al-4V ELI when turning using uncoated tungsten carbide tool. The response surface method (RSM) design of experiment using Box-behnken was used to accomodate the turning experiment factors and levels. Turning parameters studied were cutting speed (100, 135, 170 m/min), feed rate (0.15, 0.2, 0.25 mm/rev) and depth of cut (0.6, 0.8, 1.0 mm). The results show that the feed rate was the most influence factor controlling the surface roughness produced. The feed rate (F) was found directly proportional with the surface roughness value (Ra) but inversely proportional to the cutting speed (Vc). MINITAB software was used to develop a surface roughness model, and the optimum condition was at 160 m/min of cutting speed, 0.18 mm/rev of feed rate and 1 mm of depth of cut. At the optimum condition low value of 1.54 μm surface roughness was obtained.

ofTokUshima ， 1耐 血 te ofTechnology and Science Minami ・ Josanj ima 2 − 1， To shima − shi， To shim 亀 770 − 8506 Japan The tool pe 曲 ce of 皿 co 劇 cabide 画 GG l20408 − SGF − H13A， i 鰤ing the titanium alloy Ti ・ 6Al4V ELI with 32 HRC was invostigated ． The o 切 ective of this study is to 血 ves 口 gate the tool wear progression during 丘nish 加m 血 gof 血 e titanium al1 ( ) y using different combinations of cutting parameter values ． A high cuning speed range for 止e し mcoated carbide insert was used to cut Ti ・ 6AI ・ 4V ELI under flooded conditions ． The cutting parameters were chosen based on the expei ental design ． In 画 cu1π ， the Box − Be ken d雛 ign鄲 鵬 d to d創em 血 e 17 parameter combinations ． The 廿皿 ee main f 加 tols considered were t血 e cutting speed ， feed rate ， and depth of cut ． The cuUing speeds were l20 ， 170 ， and 220 曲 血 ； 出e 勧 values w 釘 e O． 1， 0． 15， and O． 2 mm ！ rev；and the depths of cut were O． 4， 05， and O． 6 ． The res曲 show that the cutting sp θed had the greatest effect on the tOol life ， fb 且 lowed by the feed rate and dqpth of cut ． The optimum combination