Ti Tal-4v Eli Lab Report

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CHAPTER 3 METHODOLOGY This chapter discusses and focusing the procedure used to investigate the surface roughness and microstructure during medium turning of Ti-6Al-4V ELI using different combinations of cutting parameter values under dry conditions. Experimental tests were carried out using uncoated carbide. 3.1 Experimental Equipments During the experiment was conducted, it involves the use of several testing equipments, cylindrical workpiece, and uncoated cutting tool. All these equipment will be discussed in the sub topic. 3.1.1 Testing equipment a. CNC lathe Haas ST-20 The machine involve in this experiment shown in Figure 3.1. Machining tests were conducted on a CNC lathe that has a continuously variable spindle speed. CNC…show more content…
This is to reduce the vibration by this hole are held by the tail stock. The surface of workpiece processed with depth of cut of 2 mm before the experiments started; in order to eliminate the harden surface that generated during its processed. In addition, the uniform of workpiece diameter can be achieved. Figure 3.3: Workpiece of Ti-6Al-4V ELI Table 3.2: Chemical composition of Ti-6Al-4V ELI (% wt) (TSI Titanium Co.) Element C Si Fe Ti Al N V S O H Y Wt% 0.11 <0.005 Table 3.3: Mechanical Properties of Ti-6Al-4V ELI (TSI Titanium Co.) Mechanical properties Value Density 4428.78 kg/ m^3 Tensile fatigue 900 MPa Ultimate tensile strength 970 MPa Thermal conductivity at 20 °C 6.6 W/ m/K Specific heat at 20 °C 0.580 J/ g.K Elongation 13% Hardness 241 HB Tensile strength at 400 °C 550 MPa Elastic modulus 107 – 122 GPa Shear modulus 41 – 45 GPa 3.1.3 Cutting tool The cutting tool used in this experiment is uncoated carbide inserts. This cutting tool made from Sandvik with rhombus shape CNGG 120408 SGF S05F. Figure 3.4 shows carbide tool uncoated CNGG 120408 SGF S05F. Figure 3.5 shows schematic geometry of the tool and the dimension is shown in the Table…show more content…
This means the minimum of experiment is four without calculate the number of Cₒ. c. With two number of Cₒ added, so number of experiments shows in Table 3.7 which designed by two level factorial. Table 3.7: Experiment running schedule that designed by two level factorial Experiments v (m/min) f (mm/rev) d (mm) 1 100 0.20 0.35 2 120 0.17 3 140 0.20 4 100 0.15 5 140 0.15 6 120 0.17 3.3 Experimental Procedures Interrupted turning cuts were carried out at fixed cutting conditions with fresh tool inserts. The measured parameter to represent the progress of wear was tool flank wear, VB. The cutting test run was periodically interrupted for each 20mm of length and the material was taken out to measure microstructure by microscope. The depth of cut value is maintained at 0.35 mm, mm while the cutting speeds are set at 100, 120, and 140 m/min and feed rate also set at 0.15, 17, and 0.20 mm/rev. The turning operation tested and stopped until the VB reached 0.3mm. The 0.3mm VB is the standard recommended criteria is defining a tool life endpoint by the ISO 3685:1993. The obtained data were analyzed in order to investigate the relation of tool wear and parameters. Figure 3.4 shows the steps of procedure in this

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