Optimization Of Machining Parameters In Laser Cutting

Chiang , Kok Wai (2009) Optimization Of Machining Parameters In Laser Cutting. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This report presents a study of optimization on machine parameters of CO2 laser cutting. Laser output power, feed rate and assisting gas pressure were selected as the major factors that will be analysed and optimized in this study. The kerf width and surface roughness were the process responses that obtained after the experiment trials which require checking by using optical comparator and surface roughness tester respectively. The material that selected in this study was mild steel 1020 that contain 0.18-0.23% carbon. The range for the laser power, feed rate and assisting gas pressure selected were 2000-2500Watts, 1200-1700mm/s and 4.5-5.5Bar respectively. The Helius 2513 CO2 laser beam cutting machine was used to conduct the experiment. Design of experiment (DOE) was used to plan the whole research. Response surface methodology (RSM) was the main technique that applies in this study to design the experiment order and array. Laser output power and feed rate had a major effect on the kerf width, while assisting gas pressure played a minor role. Decreasing power, increasing feed rate and increasing the gas pressure generally led to a decrease in kerfs width. At high and low power level, increasing feed rate create the similar decrease in kerf width. Feed rate had the most significant effect on surface roughness. Laser power had the second most significant effect on surface roughness. Increasing feed rate and reducing laser power generally lead to reducing of surface roughness. Interaction between feed rate and assisting gas pressure had the third most significant effect to the surface roughness. Increasing of both gas pressure and feed rate and reduce laser power can lead to reducing of surface roughness. At low feed rate level, the assisting gas pressure is directly proportional to surface roughness. At high feed rate level, the assisting gas pressure is inversely proportional to surface roughness. As the suggestion, the experiment trails should be carried out at least two times to reduce the potential interruption that may occur.

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