Wear of coated carbide insert in machining of titanium /
Wear of coated carbide insert in machining of titanium [electronic resource]
Heng Chun Chieh
- Kuantan, Pahang : UMP, 2009
- 60 p. : ill. (some col.) ; 30 cm. + 1 computer disc
Project paper (Bachelor of Mechanical Engineering and manufacturing Engineering) -- Universiti Malaysia Pahang - 2009
Bibliography : p. 59-60
This thesis deals with the wear of coated carbide insert in machining of titanium. Machineability of titanium and its alloys are considered very poor because of unusually high cutting temperature. The negative characteristic of titanium like low thermal conductivity, high chemical reactivity and low modulus of elasticity has accelerated the tool wear of the coated carbide when it is use to machining the titanium. This showed that, tool wear of the coated carbide inserts in machining of titanium still need to be improved. The main objective of this project is to examine the progress of tool wear and determine the crater wear and flank wear of the tool in machining the titanium in turning process. In this project, 33 full factorial design of experiments (DOE) was employed in STATISTICA software to plan and perform the experiment systematically so that any possible experimental error would be minimized. Machining independent variables considered are cutting length, cutting speed and feed rate. The variables for three levels were 90,120 and 150 m/min for cutting speed, 0.5, 1.0 and 1.5 mm/rev for feed rate and 65, 130 and 195 mm for cutting length respectively. Machining of titanium was carried out on CNC turning machine. After each experiment, flank and crater wear of the coated carbide inserts was investigated and measured by using optical microscope integrated with Image Analyzer. Experimental data were analyzed in STATISTICA. Flank and crater wear curves were then plotted in Excel. The result indicates that cutting length has the most influence on both flank and crater wear compared to cutting speed and feed rate. Optical micrograph of tool wear shows the crater wear progressed faster than flank wear. Tool wear curves shows that when the number of experiments increases, the flank and crater wear increase monotonically.