Nano-lubricant machining of Aluminum 8112 alloy is the art of sustainable manufacturing of mechanical components used for defense technology and aerospace application. However, machining aluminum alloys generates excess heat, which tends to increase the cutting force (F.C.), due to the material adhesion of the workpiece on the cutting tool. The challenge has drawn researchers’ attention to introducing nano-lubrication processes. This study focused on the comparative assessment of eco-friendly vegetable oil-based-TiO₂ and MWCNTs nano-lubricant on cutting force during the machining of the Aluminum 8112 alloy. Nanoparticles were implemented on the base oil using an ultrasonic vibrator and magnetic stirrer before the application in the machining, via the minimum quantity lubrication process. Quadratic central composite designs were employed to carry out the experiment, using five factors at five levels, having experimental runs of 50. The input parameters are helix angle (H.A.), spindle speed (S.S.), axial depth of cut (ADOC), feed rate (F.R.), and length of cut (LOC). The results show that the application of the nanoparticle increases the performance of the vegetable oil on the cutting force. TiO₂ nano-lubricant reduces the cutting force by 0.26%, compared with the MWCNTs, and 6% compared with the vegetable oil. Furthermore, the MWCNT nano-lubricant reduces the cutting force by 5% compared with the vegetable oil lubrication environment.

The choice of choosing between alternatives is a prerequisite for a chain of different engineering selection problems, such as process selection, machine selection, tools selection, material handling equipment selection, supplier selection. Hence, the objective of this paper was to evaluate the mechanical properties of tensile strength and hardness after optimization using the application of Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) during a steel metal welding process. The result obtained reveals that the weld current 170amp, weld voltage 20v, filler rod diameter 22mm and gas flow rate 3.3lit/min gave the optimal tensile strength of 496.5N/mm2 and Hardness of 190.2.

Metal cutting, plays a critical role in the manufacturing industry. To ensure sustainable growth in the quality of produced designed and manufactured, certain area of interest such as the cutting parameters, must be fully developed. Hence, the objective of this paper is to evaluate the effect of cutting speed, depth of cut, and feed rate on the metal removal rate in the machining of a cylindrical mild steel bar using appropriate standard method. From the study, a mean and standard deviation of 4.26 and 2.31 respectively is obtained. Data obtained shows that the metal removal rate obtained revealed sharp variation as a result of the influence of the cutting parameters. The feed rate revealed the most variation in its effect on the metal removal rate, as it was observed that the rate of removal increased greatly and progressively as the feed rate increased. However, a decline was observed, which is attributable to the wear of the cutting tool.