Feasibility study of laser cutting parameters on the surface finished of the galvanized plate

Saiful Bahri, Sarah Shahira (2021) Feasibility study of laser cutting parameters on the surface finished of the galvanized plate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The research on the feasibility study of laser cutting parameters on the surface finished of the galvanized plate is highlighted in this particular report. Due to its anti-rust feature, galvanized iron is frequently used in construction projects to build structures such as balconies, verandahs, staircases, ladders, walkways, and even children's playground equipment such as bicycle racks and swing sets. Knowing the surface quality of the material that used the laser cutting method as it contributes to the safety problem is important. Due to this fact, the purpose of this research is to investigate the effect of laser cutting parameters on surfaced cutting for galvanized iron. Cutting speed and assisted gas pressure are the preferred parameters. Both these parameters are accomplished by screening analysis by doing the research gap from previous researchers. The cutting speed of 1800mm/min, 2500mm/min, and 3000mm/min is categorized into three levels which are from low to high levels. The range from the pilot testing for assisted gas pressure is 1 bar up to 8 bar. Surface roughness is the process response that will be measured by using a portable surface roughness tester at the end of the experiment. For both parameters, the focus position and the consumed power of the laser are constant. Mitsubishi Electrical Model ML2512HV2-R PLUS is the machine used in this research. The Design of Experiment (DoE) technique has been applied to plan the entire study. The experiment is planned with two levels of factorial design using the software. ANOVA analysis indicates that assisted gas pressure has a greater effect on the surfaced roughness than cutting speed. Indeed, a mathematical model is constructed from the ANOVA analysis, and the proportion of error between the model and experimental values is validated to be approximately 0.5%. The optimal responses were obtained at a cutting speed of 1800 mm/min and an assisted gas pressure of 8 bar at the end of the research. Validation of these optimal parameters was made between the model and the experiment. As a result, the optimum error value is 7.08%.

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