Ultra-Fine Bubbles (UFB) Inserted Novel Coconut Oil Based Metal Working Fluid (MWF) As a Sustainable Lubricant for Turning of Ti-6Al-4V

K. Wickramasinghe, H. Sasahara
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Abstract

As for the first time in the advanced manufacturing research and development sector, the nano range bubbles (i.e., UFB) were injected to the coconut oil-based metal working fluid (COCO) to facilitate better cooling and lubrication condition for machining difficult to cut materials. Higher heat transfer characteristics, and better purification properties of the UFB were incorporated to the higher free fatty acid contained COCO to facilitate a favorable machining condition. Moreover, COCO ensures health and environmental friendliness and express higher potential to replace the toxic and hazardous synthetic oil based MWF (SynO) from the machining process. In this study, the cooling and lubrication performance of the UFB inserted novel COCO was clarified and benchmarked with a commercially available high performance SynO for machining Ti-6Al-4V. Eighteen percent cutting force reduction was obtained due to the hybrid effect of UFB and free fatty acid. Additionally, lower work tool interface temperature, surface roughness, and tool wear were obtained at the UFB inserted COCO compared to the SynO. Hence, the excellent tribological and rheological properties of the UFB inserted novel COCO has concluded high performance sustainable machining and provided a promising solution to conquer the challenges (i.e., low machinability index and sustainability) of machining Ti-6Al-4V.
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超细气泡(UFB)插入新型椰子油基金属加工液(MWF)作为Ti-6Al-4V车削的可持续润滑剂
在先进制造研发领域首次将纳米级气泡(即UFB)注入到椰子油基金属加工液(COCO)中,为加工难切削材料提供更好的冷却和润滑条件。较高的传热特性和较好的UFB净化性能与较高的游离脂肪酸含量相结合,为加工提供了有利的条件。此外,可可保证了健康和环保,在机械加工过程中取代有毒有害的合成油基MWF (SynO)表现出更大的潜力。在这项研究中,UFB插入新型COCO的冷却和润滑性能被澄清,并与市售的用于加工Ti-6Al-4V的高性能SynO进行基准测试。由于UFB和游离脂肪酸的混合作用,切削力降低了18%。此外,与SynO相比,UFB插入的COCO获得了更低的工件界面温度、表面粗糙度和刀具磨损。因此,UFB插入新型COCO优异的摩擦学和流变学性能为Ti-6Al-4V的高性能可持续加工提供了一个有希望的解决方案,即克服加工Ti-6Al-4V的挑战(即低可加工性指数和可持续性)。
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