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Lee, Pil-Ho,Kim, Jin Woo,Lee, Sang Won Elsevier 2018 JOURNAL OF CLEANER PRODUCTION Vol.201 No.-
<P><B>Abstract</B></P> <P>In this paper, a new eco-friendly lubrication technique, which is referred to as the nanofluid air flow assisted electrostatic lubrication (AF-ESL), has been proposed and applied to the micro-grinding process of titanium alloy. In the nanofluid AF-ESL technique, nanofluid droplets can be injected into the grinding region by being driven by an electro-hydro-dynamic force and pressurized air flow. For the experimental performance evaluation, a series of micro-grinding experiments are designed and conducted by varying a size and a weight concentration of nanodiamond particles in the nanofluid. It is demonstrated that the nanofluid AF-ESL can significantly reduce the resultant grinding forces and grinding force ratios. It is also shown that the nanofluid AF-ESL improves the surface quality of ground workpiece and grinding tool condition significantly. In particular, larger nanodiamond particles (80 nm) are more advantageous for enhancing the nanofluid AF-ESL micro-grinding performances. In addition, a weight concentration of nanodiamond particles in the nanofluid is another important factor to influence on the micro-grinding performances.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Eco-friendly nanofluid air flow assisted electrospray lubrication (AF-ESL) technique is proposed. </LI> <LI> Micro-grinding process of titanium alloy using the nanofluid AF-ESL technique is experimentally characterized. </LI> <LI> The nanofluid AF-ESL can reduce grinding forces and grinding force ratios significantly. </LI> <LI> The nanofluid AF-ESL can enhance surface quality of ground workpiece and grinding tool condition significantly. </LI> <LI> Suitable size and weight concentration of nanodiamond particles should be selected to enhance micro-grinding performances. </LI> </UL> </P>
Eco-Friendly Face Milling of Titanium Alloy
박경희,이동윤,양기동,이명규,정훈,이석우 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Recently, a use of difficult to cut materials including titanium alloy has been substantially increasing in aerospace and automotiveindustries. Eco-friendly machining technology, which eliminates or minimizes cutting fluids in machining fields, has been emerged incompliance with green manufacturing trend. In this regard, machining technologies, such as hard milling, laser assisted machining(LAM), and enhanced lubrication/cooling method, have been adapted by the industries. Among the technologies, cryogenic machininghas been considered for a viable solution for the materials without any environmental problems. LAM and minimum quantitylubrication (MQL) can be useful method to cut these materials with an appropriate use. In this study, machining performance of ecofriendlymachining techniques was compared experimentally for the titanium alloy (Ti-6Al-4V). The machining performance wasevaluated in terms of tool wear and cutting force. From experimental results, coated cutting tool with flood cooling condition wasnot recommended in titanium machining. The cryogenic, MQL, LAM showed outstanding machining performance than dry and floodcooling. Especially MQL machining was superior with relatively simple system setup. In addition, lubrication and cooling mechanismby combination of MQL and cryogenic reduced cutting force and tool wear. For energy consumption, MQL and cryogenic methodscan be a sustainable solution.
Eco-Friendly Face Milling of Titanium Alloy
Park, Kyung-Hee,Yang, Gi-Dong,Lee, Myung-Gyu,Jeong, Hoon,Lee, Seok-Woo,Lee, Dong Yoon 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.6
Recently, a use of difficult to cut materials including titanium alloy has been substantially increasing in aerospace and automotive industries. Eco-friendly machining technology, which eliminates or minimizes cutting fluids in machining fields, has been emerged in compliance with green manufacturing trend. In this regard, machining technologies, such as hard milling, laser assisted machining (LAM), and enhanced lubrication/cooling method, have been adapted by the industries. Among the technologies, cryogenic machining has been considered for a viable solution for the materials without any environmental problems. LAM and minimum quantity lubrication (MQL) can be useful method to cut these materials with an appropriate use. In this study, machining performance of eco-friendly machining techniques was compared experimentally for the titanium alloy (Ti-6Al-4V). The machining performance was evaluated in terms of tool wear and cutting force. From experimental results, coated cutting tool with flood cooling condition was not recommended in titanium machining. The cryogenic, MQL, LAM showed outstanding machining performance than dry and flood cooling. Especially MQL machining was superior with relatively simple system setup. In addition, lubrication and cooling mechanism by combination of MQL and cryogenic reduced cutting force and tool wear. For energy consumption, MQL and cryogenic methods can be a sustainable solution.
조용근(Yonggeun Cho),백진욱(Jinwook Baek),정헌술(Heonsul Jeong) 한국신뢰성학회 2020 신뢰성응용연구 Vol.20 No.4
Purpose: The cylinder block of a driving motor is fabricated by joining a copper alloy with excellent lubrication for a fast-rotating part to a valve plate and a piston with linear reciprocating motion. Although Pb, a commonly added solid lubricant, is being replaced for conformance with ecofriendly regulations, namely Restriction of Hazardous Substances (RoHS) directives, it does not involve a logical verification system. Methods: In this study, a comparative test method was developed on the basis of the standard for abrasion resistance tests for material components. Results: Improved samples were comparatively evaluated using the developed comparative test method. Conclusion: It is expected that the proposed comparative test method will be reviewed as a verification method for similar development and will be further used for the development of accelerated life tests.