Optimization Cutting Parameters of Ti-6Al-4V ELI Thread on Major and Minor Diameters Using Taguchi Method

The development of the manufacturing industry is increasing in recent decade, so the manufacturing industry needs the right solution in solving manufacturing problems, including in producing components in micro sizes, with high quality and better accuracy. To anticipate the weakness of titanium in the machining process, the research carried out to optimize the cutting parameters. This study aims to optimize the cutting parameters in the production of threads for major and minor diameter errors. The geometry error of screw in threading is influenced by cutting speed, depth of cut, and type of machining. Machining is carried out by using with a thread diameter of M4 x 0.7, which uses 3 factors and each consists of 3 levels. The research design and analysis were carried out by using the Taguchi method, where the cutting speed was 17.58, 21.35, 25.12 m/min, the depth of cut was 0.085, 0.108, and 0.143 mm, and the type of machining was dry, using palm oil and synthetic oil lubricants. The results showed that the optimal conditions were obtained in a combination of cutting parameters with cutting speed factor of 25.12 m/min, depth of cut of 0.143 mm and oil palm lubricant, where the response value of the major diameter error was 0.088 mm. While the optimal machining conditions for minor diameter errors are at a cutting speed of 25.12 m/min, depth of cut 0.083 mm and synthetic oil cooling type, where the response to a minor diameter error is 0.07 mm.