Abstract
The liquid-assisted laser machining process is a promising method to cut materials with minimum thermal damage caused by laser, and water is typically used in the process due to its high thermal conductivity, nontoxicity, and relatively low price. However, water can intrinsically oxidize ferrous metals and in turn deteriorate the workpiece through corrosion during laser ablation in water. This study has for the first time proposed laser ablation in soluble oil to effectively cut the ferrous metals by using laser in a high cooling rate and low potentiality of corrosion to the metals. A nanosecond pulse laser was used to scan over the AISI H13 steel sheet to create a square cavity, while the workpiece surface was covered by a thin and flowing soluble oil film throughout the laser milling process. The effects of laser scan overlap, traverse speed, and liquid flow rate on cavity dimensions and milled surface morphology were experimentally examined. The results revealed that a clean and uniform cavity with a smooth machined surface can be attained by using 70% scan overlap, 6 mm/s traverse speed, and 3.9 cm3/s soluble oil flow rate. Furthermore, analytical models based on heat transfer equations were formulated to predict the cavity profile and cooling of molten droplets in flowing liquid. The predicted profile was found to correspond well to the experiment, and the calculated temperature of cut particles can endorse the experimental findings on debris deposition and recast formation. The implications of this study could bring a new technological approach for damage-free fabrication and fine-scale manufacturing.
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Acknowledgments
This research was financially supported by the Thailand Research Fund and the Office of the Higher Education Commission, Ministry of Education, Thailand (Grant No. MRG6080010). The authors would like to thank Mr.Thawatchai Waithayasin, Mr.Suntisuk Suksiri, and Ms.Onnicha Ongarjphanchai for their assistance in sample preparations and measurements.
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Tangwarodomnukun, V., Dumkum, C. Experiment and analytical model of laser milling process in soluble oil. Int J Adv Manuf Technol 96, 607–621 (2018). https://doi.org/10.1007/s00170-018-1648-z
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DOI: https://doi.org/10.1007/s00170-018-1648-z