PENGARUH MINYAK JATROPHA CURCAS LINN TERHADAP SURFACE ROUGHNESS DAN BENTUK GERAM HASIL PEMBUBUTAN TITANIUM

The machiniability of titanium alloys is generally considered bad because it has a furious tendency to stick to the cutting tool during machining, causing chipping and tool failure prematurely. Viewed from the side of its function, cooling media is one of the factors causing bad machining of titanium. The use of chemical liquids in the titanium turning process is considered a lot of risk so that research is done using bio-oil as cutting fluid. This study establishes jatropha curcas linn as a coolant in the process titanium (Ti6246). The method of this research varies in the amount of oil content of jatropha curcas emulsified with water to investigate the roughness of the workpiece surfaces and the shape of the titanium burring process. The results show that the use of jatropha curcas oil as a cuttingfluid of titanium machining process with medium speed yielded a relatively high roughness value of 3.059 μm. Mixing water as an emulsion (water soluble fluid) with jatropha curcas oil can reduce the surface roughness value because water is very effective in stabilizing thermally and oil can also reduce water tendency that causes oxidation. In addition, the form of chips (chips) produced by this machining process including serrated chips (or so-called segmented or nonhomogeneous chips) are serrated and semi continue